CN108547694B - Detection method, detection device and detection system of electromagnetic fan - Google Patents

Abstract

The invention discloses a detection method, a detection device and a detection system of an electromagnetic fan, which are applied to a control system of the electromagnetic fan, wherein the control system of the electromagnetic fan comprises the electromagnetic fan, an electronic control unit and an engine, and the detection method comprises the following steps: when the electronic control unit is electrified, the opening of an accelerator is 0 and the speed of a vehicle is 0, controlling an electromagnetic fan to be adjusted to a first rotating speed mode and obtain a first engine torque of the engine, and then controlling the electromagnetic fan to be adjusted to a second rotating speed mode and obtain a second engine torque of the engine, wherein a preset rotating speed value in the first rotating speed mode is smaller than a preset rotating speed value in the second rotating speed mode; and if the first engine torque is detected to be larger than the second engine torque, judging that the electromagnetic clutch plugging state of the electromagnetic fan is abnormal. According to the embodiment of the invention, the detection of the electromagnetic fan is realized, the abnormal condition of the electromagnetic clutch plugging state of the electromagnetic fan can be found in time, and the normal operation of the vehicle cooling system is further ensured.

Description

Detection method, detection device and detection system of electromagnetic fan

technical field

Embodiments of the present invention relate to an electromagnetic fan control technology of an engine, and in particular, to a detection method, a detection device and a detection system for an electromagnetic fan.

Background technique

Electromagnetic fans are widely used in vehicle cooling systems.

The existing common electromagnetic fan is usually a three-speed electromagnetic fan, that is, there are three states of low speed, medium speed and high speed. An electromagnetic clutch is usually set in an electromagnetic fan system, and the electromagnetic clutch is electrically connected to two relays. One of the two relays is used to control the electromagnetic clutch to make the electromagnetic fan run at a medium speed, and the other is used to control the electromagnetic clutch to make the electromagnetic fan operate at a medium speed. High speed operation. The engine electronic control unit is electrically connected to the two relays respectively through two control pins and connectors, and sends open and close signals through the two control pins, thereby controlling the open and closed states of the two relays to control the clutch state of the electromagnetic clutch, thereby making The electromagnetic fan runs at a certain speed.

However, in the actual production process, the relays that control the medium-speed operation of the electromagnetic fan and the relays that control the high-speed operation of the electromagnetic fan may be reversely connected to the corresponding control pins, resulting in the abnormal operation of the electromagnetic fan and the failure of the electronic control unit. If the above situation is detected, it will have an adverse effect on the vehicle cooling system.

SUMMARY OF THE INVENTION

The invention provides a detection method, a detection device and a detection system for an electromagnetic fan, so as to realize the detection of the electromagnetic fan and timely find out the abnormal operation of the electromagnetic fan.

In a first aspect, an embodiment of the present invention provides a detection method for an electromagnetic fan. The detection method is applied to a control system for an electromagnetic fan. The control system for an electromagnetic fan includes an electromagnetic fan, an electronic control unit, and an engine. The detection method includes:

When it is detected that the electronic control unit is powered on, the accelerator opening is 0, and the vehicle speed is 0, the electromagnetic fan is controlled to be adjusted to the first rotational speed mode and the first engine torque of the engine is obtained, and then the electromagnetic fan is controlled to be adjusted to the second rotational speed mode and obtaining a second engine torque of the engine, wherein the preset rotational speed value in the first rotational speed mode is smaller than the preset rotational speed value in the second rotational speed mode;

If it is detected that the first engine torque is greater than the second engine torque, it is determined that the electromagnetic clutch connection state of the electromagnetic fan is abnormal.

Wherein, the control system of the electromagnetic fan further includes a first relay and a second relay, and the electronic control unit includes a first control port and a second control port;

The specific execution process of controlling the electromagnetic fan to adjust to the first rotation speed mode is as follows: sending a first conduction command to the first relay electrically connected to the first control port through the first control port to make the electromagnetic fan operate according to the first rotation speed mode;

The specific execution process of controlling the electromagnetic fan to adjust to the second rotation speed mode is as follows: sending a second conduction command to the second relay electrically connected to the second control port through the second control port to make the electromagnetic fan operate according to the second rotation speed mode.

Wherein, after determining that the electromagnetic clutch of the electromagnetic fan is abnormally connected, the method further includes:

Send a second conduction command to the first relay through the first control port to make the electromagnetic fan run according to the second rotation speed mode; and send the first conduction command to the second relay through the second control port to make the electromagnetic fan run according to the first run in a speed mode.

Wherein, after determining that the electromagnetic clutch of the electromagnetic fan is abnormally connected, the method further includes:

If the difference between the first engine torque and the second engine torque is less than the engine torque threshold, it is determined that the electromagnetic clutch coil is faulty, and a prompt for checking the operation of the electromagnetic clutch coil is output.

Wherein, the detection method also includes:

If the first engine torque is less than the second engine torque, it is determined that the electromagnetic clutch of the electromagnetic fan is in a normal state.

Among them, before detecting that the electronic control unit is powered on, the accelerator opening is 0, and the vehicle speed is 0, it also includes:

Detecting whether a short-circuit fault or an open-circuit fault occurs in the connection path between the first relay and the first control port, and the connection path between the second relay and the second control port;

If it is detected that the connection path between the first relay and the first control port and the connection path between the second relay and the second control port do not have an open-circuit fault or a short-circuit fault, the control continues to execute the electromagnetic fan detection process.

Wherein, if it is detected that the connection path between the first relay and the first control port and/or the connection path between the second relay and the second control port has an open-circuit fault or a short-circuit fault, control the connection path between the first relay and the first control port. And/or a fault in the connection path between the second relay and the second control port is reported, and the detection process for the electromagnetic fan is controlled to exit.

Wherein, before controlling the electromagnetic fan to adjust to the first rotational speed mode and obtaining the first engine torque of the engine, the method further includes:

It is detected whether the electronic control unit receives a trigger instruction for detecting the electromagnetic fan, and if so, the control continues to execute the detection process of the electromagnetic fan.

In a second aspect, an embodiment of the present invention further provides a detection device for an electromagnetic fan. The detection device is applied to a control system for an electromagnetic fan. The control system for an electromagnetic fan includes an electromagnetic fan, an electronic control unit, and an engine. The detection device includes :

The control module is used to control the electromagnetic fan to adjust to the first rotational speed mode and obtain the first engine torque of the engine when it is detected that the electronic control unit is powered on, the accelerator opening is 0, and the vehicle speed is 0, and then the electromagnetic fan is adjusted to the second rotational speed mode and obtaining the second engine torque of the engine, wherein the preset rotational speed value in the first rotational speed mode is smaller than the preset rotational speed value in the second rotational speed mode;

The determining module is configured to determine that the electromagnetic clutch of the electromagnetic fan is abnormally connected if it is detected that the first engine torque is greater than the second engine torque.

Wherein, the control system of the electromagnetic fan further includes a first relay and a second relay, and the electronic control unit includes a first control port and a second control port;

The control module is used for sending a first conduction command to the first relay electrically connected with the first control port through the first control port to make the electromagnetic fan run according to the first rotation speed mode, and is also used for sending a first conduction instruction to the first relay through the second control port to the first relay connected to the first control port. The second relay electrically connected with the two control ports sends a second conduction command to make the electromagnetic fan run according to the second rotation speed mode.

Wherein, the detection device further includes: a correction module, the correction module is configured to send a second conduction command to the first relay through the first control port after determining that the electromagnetic clutch of the electromagnetic fan is in an abnormal state, so as to make the electromagnetic fan follow the second The rotation speed mode is operated, and a first conduction command is sent to the second relay through the second control port to make the electromagnetic fan operate according to the first rotation speed mode.

Wherein, the detection device further includes: a clutch coil fault judgment module, which is used to judge the clutch coil if the difference between the first engine torque and the second engine torque is smaller than the engine torque threshold after the electromagnetic clutch of the electromagnetic fan is judged to be abnormal. fault, and output a prompt to check the operation of the clutch coil.

Wherein, the determination module is further configured to determine that the electromagnetic clutch of the electromagnetic fan is in a normal connection state if the first engine torque is smaller than the second engine torque.

Wherein, the detection device further includes: a circuit fault detection module for detecting the connection path between the first relay and the first control port, and the first relay before detecting that the electronic control unit is powered on, the accelerator opening is 0, and the vehicle speed is 0. Whether a short-circuit fault or an open-circuit fault occurs in the connection path between the second relay and the second control port;

If it is detected that the connection path between the first relay and the first control port and the connection path between the second relay and the second control port do not have an open-circuit fault or a short-circuit fault, the control continues to execute the electromagnetic fan detection process.

Wherein, the circuit fault detection module is further configured to control the connection between the first relay and the first control port if there is an open-circuit fault or a short-circuit fault in the connection path between the first relay and the first control port and/or the connection path between the second relay and the second control port. An error is reported in the connection path of the first control port and/or the connection path between the second relay and the second control port, and the detection process for the electromagnetic fan is controlled to exit.

The detection device further includes a trigger detection module for detecting whether the electronic control unit receives a trigger instruction for detecting the electromagnetic fan before controlling the electromagnetic fan to adjust to the first rotational speed mode and obtaining the first engine torque of the engine. , the control continues to perform the detection process of the electromagnetic fan.

In a third aspect, an embodiment of the present invention further provides a detection system for an electromagnetic fan, including the electromagnetic fan detection device provided in the second aspect, an electronic control unit, an electromagnetic fan, and a motor.

Among them, the detection device of the electromagnetic fan is integrated in the electronic control unit.

Embodiments of the present invention provide a detection method, detection device and detection system for an electromagnetic fan. After the electronic control unit is powered on, the accelerator opening is 0 and the vehicle speed is 0, that is, no other load. The fan is adjusted to the first rotational speed mode and the first engine torque of the engine is obtained, and then the electromagnetic fan is controlled to be adjusted to the second rotational speed mode and the second engine torque of the engine is obtained, wherein the preset rotational speed value in the first rotational speed mode is smaller than the second rotational speed value of the engine. The preset speed value in the speed mode, so under the condition that the electromagnetic fan control system is connected in a normal state, the power required for the electromagnetic fan to run in the first speed mode should be less than the power required for the electromagnetic fan to run in the second speed mode, that is The first engine torque should be less than the second engine torque. Therefore, if it is detected that the first engine torque is greater than the second engine torque, it can be determined that the electromagnetic clutch of the electromagnetic fan is in an abnormal state. The embodiment of the present invention solves the situation that the electronic control unit in the prior art cannot detect that the relay for controlling the medium-speed operation of the electromagnetic fan and the relay for controlling the high-speed operation of the electromagnetic fan are reversely connected to the corresponding control pins, which causes a problem to the vehicle cooling system. Affect the problem, realize the detection of the electromagnetic fan, find out the abnormal situation of the electromagnetic clutch of the electromagnetic fan in time, and then ensure the normal operation of the vehicle cooling system.

Description of drawings

FIG. 1 is a flowchart of a method for detecting an electromagnetic fan according to Embodiment 1 of the present invention.

FIG. 2 is a flowchart of a method for detecting an electromagnetic fan according to Embodiment 2 of the present invention.

FIG. 3 is a schematic structural diagram of a detection device for an electromagnetic fan according to Embodiment 3 of the present invention.

FIG. 4 is a schematic structural diagram of a detection device for an electromagnetic fan according to Embodiment 4 of the present invention.

FIG. 5 is a schematic structural diagram of a detection system for an electromagnetic fan according to Embodiment 5 of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, the drawings only show some but not all structures related to the present invention.

Example 1

1 is a flowchart of a method for detecting an electromagnetic fan according to Embodiment 1 of the present invention. This embodiment is applicable to the case of detecting an electromagnetic fan. The detection method can be performed by a detecting device for an electromagnetic fan, and is applied In the control system of the electromagnetic fan, the control system of the electromagnetic fan includes an electromagnetic fan, an electronic control unit and an engine, and the detection method includes:

Step 110: When it is detected that the electronic control unit is powered on, the accelerator opening is 0, and the vehicle speed is 0, the electromagnetic fan is controlled to be adjusted to the first rotational speed mode and the first engine torque of the engine is obtained, and then the electromagnetic fan is controlled to be adjusted to the second rotational speed mode. a rotation speed mode and obtain a second engine torque of the engine, wherein the preset rotation speed value in the first rotation speed mode is smaller than the preset rotation speed value in the second rotation speed mode;

Specifically, the electromagnetic fan includes an electromagnetic clutch. When the electromagnetic fan operates in the first rotation speed mode and the second rotation speed mode, the contact states of the electromagnetic clutch are different. For the existing electromagnetic fan, it usually includes three operation modes: low speed, medium speed and high speed. For example, the first rotation speed mode may be the medium speed operation mode of the electromagnetic fan, and the second rotation speed mode may be the high speed operation mode of the electromagnetic fan. When it is detected that the electronic control unit is powered on, the accelerator opening is 0, and the vehicle speed is 0, it means that the electronic control unit is in working state and the current state of the vehicle is no load. Under this condition, the engine can be started to run at idle speed for a period of time. , so that the engine enters a relatively stable state and reduces the error. The specific time of the idling operation can be preset, for example, the first time threshold of idling operation is set, and when the idling time of the engine reaches at least the first time threshold, the electromagnetic fan is controlled to be adjusted to the first rotation speed mode, that is, the vehicle has only A load of the electromagnetic fan is running, and the first engine torque of the engine is obtained; then when the electronic control unit is powered on, the accelerator opening is 0, and the vehicle speed is 0, the electromagnetic fan is controlled to adjust to the second speed mode and obtain the first engine torque. 2. Engine torque. The preset rotation speed value in the first rotation speed mode is smaller than the preset rotation speed value in the second rotation speed mode, that is, under the condition that the electromagnetic fan control system is wired normally, the rotation speed of the electromagnetic fan in the first rotation speed mode is smaller than that of the electromagnetic fan in the The rotation speed in the second rotation speed mode, so the power required by the electromagnetic fan in the first rotation speed mode is less than the power required by the electromagnetic fan in the second rotation speed mode, that is, the first engine torque should be smaller than the second engine torque.

Step 120: If it is detected that the first engine torque is greater than the second engine torque, it is determined that the electromagnetic clutch of the electromagnetic fan is in an abnormal connection state.

Exemplarily, after detecting that the electronic control unit is powered on, the accelerator opening is 0, and the vehicle speed is 0, the first engine torque obtained after the electromagnetic fan is controlled to be adjusted to the first rotational speed mode is Trq1, and the electromagnetic fan is controlled to be adjusted to the first engine torque. The second engine obtained after the second speed mode is Trq2. If Trq1>Trq2, it means that the power required by the electromagnetic fan to operate in the first speed mode is greater than that of the electromagnetic fan when it operates in the second speed mode. Electric, under the condition that the accelerator opening is 0 and the vehicle speed is 0, the vehicle has no other load except the electromagnetic fan running, so if Trq1>Trq2, it means that the electromagnetic fan is running in the first speed mode and the speed is greater than the electromagnetic fan running at The rotation speed in the second rotation speed mode is inconsistent with the situation that the preset rotation speed value in the first rotation speed mode is smaller than the preset rotation speed value in the second rotation speed mode when the electromagnetic fan electromagnetic clutch is in a normal state. Therefore, when Trq1>Trq2 , it can be determined that the connection state of the electromagnetic clutch is abnormal. Optionally, if it is detected that the first engine torque is equal to the second engine torque, it is also determined that the connection state of the electromagnetic clutch of the electromagnetic fan is abnormal. The above technical solution, on the basis of not changing the existing vehicle connection structure, the magnitude relationship between the first engine torque when the electromagnetic fan operates in the first rotational speed mode and the second engine torque when the electromagnetic fan operates in the second rotational speed mode It can be determined whether the connection state of the electromagnetic fan clutch is normal, and the abnormality of the connection state of the electromagnetic clutch of the electromagnetic fan can be found in time.

On the basis of the above scheme, optionally, the detection method further includes:

Step 121 , if the first engine torque is less than the second engine torque, it is determined that the electromagnetic clutch of the electromagnetic fan is in a normal state.

Specifically, under the condition that the electronic control unit is powered on, the accelerator opening is 0 and the vehicle speed is 0, the first engine torque of the engine when the electromagnetic fan is in the first speed mode is smaller than the engine torque when the electromagnetic fan is in the second speed mode The second engine torque, that is, the electromagnetic fan rotation speed in the first rotation speed mode is lower than the electromagnetic fan rotation speed in the second rotation speed mode, which is consistent with the preset situation, so it can be determined that the electromagnetic clutch of the electromagnetic fan is in a normal state.

On the basis of the above solution, optionally, before controlling the electromagnetic fan to adjust to the first rotational speed mode and obtaining the first engine torque of the engine, the method further includes:

Step 101: Detect whether the electronic control unit receives a trigger instruction for detecting the electromagnetic fan, and if so, the control continues to execute the process of detecting the electromagnetic fan.

Because the electromagnetic fan is detected every time the engine is started, the aging speed of the electromagnetic fan control system will be accelerated, so the electromagnetic fan detection method can be set as trigger detection, that is, only the electronic control unit receives the trigger instruction to detect the electromagnetic fan. When , the control executes the detection process of the electromagnetic fan. For example, the trigger instruction for detecting the electromagnetic fan can be set as the electronic control unit receives that the accelerator pedal is continuously depressed-released 4 times within a second preset time (for example, within 5s), then when the electronic control unit detects the above After triggering the command, the control continues to execute the electromagnetic fan detection process, so as to avoid the problem that the electromagnetic fan is detected too frequently and the aging speed of the control system is too fast.

This embodiment provides a method for detecting an electromagnetic fan. After the electronic control unit is powered on, under the condition that the accelerator opening is 0 and the vehicle speed is 0, that is, there is no other load, the electromagnetic fan is controlled to be adjusted to the first rotational speed mode And obtain the first engine torque of the engine, and then control the electromagnetic fan to adjust to the second speed mode and obtain the second engine torque of the engine, wherein the preset speed value in the first speed mode is smaller than the preset speed in the second speed mode Therefore, under the condition that the connection state of the electromagnetic fan control system is normal, the power required for the electromagnetic fan to operate in the first speed mode should be less than the power required for the electromagnetic fan to operate in the second speed mode, that is, the torque of the first engine should be less than that of the first engine. 2. Engine torque. Therefore, if it is detected that the first engine torque is greater than the second engine torque, it can be determined that the electromagnetic clutch of the electromagnetic fan is in an abnormal state. The embodiment of the present invention solves the situation that the electronic control unit in the prior art cannot detect that the relay for controlling the medium-speed operation of the electromagnetic fan and the relay for controlling the high-speed operation of the electromagnetic fan are reversely connected to the corresponding control pins, which causes a problem to the vehicle cooling system. Affect the problem, realize the detection of the electromagnetic fan, find out the abnormal situation of the electromagnetic clutch of the electromagnetic fan in time, and then ensure the normal operation of the vehicle cooling system.

Embodiment 2

2 is a flowchart of a method for detecting an electromagnetic fan according to Embodiment 2 of the present invention. On the basis of Embodiment 1 above, this embodiment further provides an optional method for detecting an electromagnetic fan.

Optionally, the control system of the electromagnetic fan further includes a first relay and a second relay, and the electronic control unit includes a first control port and a second control port;

In step 110, the specific execution process of controlling the electromagnetic fan to adjust to the first rotational speed mode is as follows:

Send a first conduction command to the first relay electrically connected to the first control port through the first control port to make the electromagnetic fan run according to the first rotation speed mode;

In step 110, the specific execution process of controlling the electromagnetic fan to adjust to the second rotational speed mode is as follows:

A second conduction command is sent to the second relay electrically connected to the second control port through the second control port, so that the electromagnetic fan operates according to the second rotation speed mode.

The on-off state of the first relay and the second relay determines the contact degree of the electromagnetic clutch of the electromagnetic fan, and then determines the operation mode of the electromagnetic fan. When the wiring of the control system of the electromagnetic fan is normal, the first relay electrically connected to the first control port is turned on, and when the second relay electrically connected to the second control port is turned off, the electromagnetic fan operates according to the first rotational speed mode; When the second relay electrically connected to the second control port is turned on, the electromagnetic fan operates according to the second rotational speed mode. Operates in the second rotational speed mode. Optionally, the first rotational speed mode is a medium-speed operation mode of the electromagnetic fan, and the second rotational speed mode is a high-speed operation mode of the electromagnetic fan. Therefore, when the electromagnetic fan is controlled to be adjusted to the first rotational speed mode, a conduction command is sent to the first relay electrically connected to it through the first control port, so that the first relay is turned on; when the electromagnetic fan is controlled to be adjusted to the second rotational speed mode, A conduction command is sent to the second relay electrically connected to it through the second control port, so as to make the second relay conduct.

Specifically, the electromagnetic fan control system further includes a first engine wiring harness electrically connected to the first control port, a second engine wiring harness electrically connected to the second control port, a first vehicle wiring harness electrically connected to the first relay, and A second vehicle wiring harness electrically connected to the second relay, wherein the engine wiring harness and the vehicle wiring harness are electrically connected through a connector. The connector includes a male header and a female header. In order to prevent wrong connection, the connector of the first engine wiring harness that is electrically connected to the first control port is usually connected to the relay that makes the electromagnetic fan run in the first rotational speed mode when it is turned on. The electrical connector of the vehicle wiring harness is made into male and female connectors of the same model to match each other; the connector of the second engine wiring harness, which is electrically connected to the second control port, is connected to the electromagnetic fan when it is turned on. The whole vehicle wiring harness connector electrically connected to the relay operating in the second rotational speed mode is made into male and female connectors of the same model to match each other. However, in the actual production process, due to the negligence of production workers and other reasons, the situation opposite to the above situation often occurs, causing the workers to connect the first control port and make the electromagnetic fan run in the second speed mode when the wiring is turned on. The relay is electrically connected, and the second control port is electrically connected to the relay that makes the electromagnetic fan run in the first rotation speed mode under the condition of conduction, so that the first control port sends a conduction command to the first relay electrically connected to it to make the electromagnetic fan run in the first rotational speed mode. When the first relay is turned on, the electromagnetic fan is adjusted to the second rotational speed mode, and when the second relay is turned on by sending a turn-on command through the second control port to the second relay that is electrically connected to it, the electromagnetic fan is adjusted to the first rotational speed mode abnormal situation.

Exemplarily, when the first rotational speed mode is the medium-speed operation mode of the electromagnetic fan, and the second rotational speed mode is the high-speed operation mode of the electromagnetic fan, when the above abnormal situation occurs, if the electronic control unit wants to adjust the electromagnetic fan to the medium speed In the running mode, a conduction command will be sent to the first relay electrically connected to it through the first control port. At this time, the electromagnetic fan will be adjusted to the high-speed running mode, which will cause the vehicle to dissipate too much heat and cause the engine water temperature to be low. , affecting the performance of the vehicle.

Optionally, after determining that the electromagnetic clutch of the electromagnetic fan is abnormally connected, the method further includes:

Step 130: Send a second conduction command to the first relay through the first control port to make the electromagnetic fan run according to the second rotational speed mode; and, send the first conduction command to the second relay through the second control port to make the electromagnetic fan operate The fan operates according to the first rotational speed mode.

Exemplarily, if it is detected that the first engine torque is greater than the second engine torque, it means that the rotational speed of the electromagnetic fan operating in the first rotational speed mode is greater than the rotational speed of the electromagnetic fan operating in the second rotational speed mode, and the electromagnetic fan is connected to the electromagnetic clutch. When the state is normal, it does not match that the preset speed value in the first speed mode is smaller than the preset speed value in the second speed mode, it can be determined that the connection state of the electromagnetic clutch is abnormal, and the specific abnormal situation can be the first control port. The second control port is electrically connected with the relay which makes the electromagnetic fan run in the second rotation speed mode under the conduction condition, and the second control port is electrically connected with the relay which makes the electromagnetic fan run in the first rotation speed mode under the conduction condition. Therefore, to make the electromagnetic fan run normally, that is, to make the first engine torque in the first speed mode less than the second engine torque in the second speed mode, the electronic control unit is powered on, the accelerator opening is 0, and the vehicle speed is 0 means that under the condition of no other load, the speed of the electromagnetic fan in the first speed mode should be lower than the speed of the electromagnetic fan in the second speed mode, and it is not easy to change the wiring after the wiring harness of the whole vehicle is completed. The speed mode of the electromagnetic fan is adjusted through the sending port of the command, that is, the second conduction command is sent to the first relay through the first control port to make the electromagnetic fan run according to the second speed mode; and, through the second control port A first conduction command is sent to the second relay to make the electromagnetic fan operate according to the first rotation speed mode.

For example, when the first rotation speed mode is a medium-speed operation mode, and the second rotation speed mode is a high-speed operation mode, if the above wiring is reversed, the electromagnetic fan will run when the first relay electrically connected to the first control port is turned on. In the second rotational speed mode, when the second relay electrically connected to the second control port is turned on, the electromagnetic fan operates in the first rotational speed mode. When the electronic control unit needs to adjust the electromagnetic fan to the first rotational speed mode, it can send a first conduction command to the second relay electrically connected to it through the second control port, so that the second relay is turned on, and the electromagnetic fan operates at the first speed. Speed mode operation allows the vehicle cooling system to operate normally.

Optionally, after determining that the electromagnetic clutch of the electromagnetic fan is abnormally connected, the method further includes:

Step 140: If the difference between the first engine torque and the second engine torque is less than the engine torque threshold, determine that the electromagnetic clutch coil is faulty, and output a prompt for checking the working condition of the electromagnetic clutch coil.

With the use of the electromagnetic fan, the electromagnetic clutch coil of the electromagnetic fan will age and cause failure. After it is determined that the electromagnetic clutch is abnormally connected according to the fact that the first engine torque is greater than the second engine torque, the fault state of the electromagnetic clutch coil can be determined continuously. When the electromagnetic clutch of the electromagnetic fan is abnormally connected and the electromagnetic clutch coil is working normally, the first torque of the engine should be much larger than the second torque of the engine, so when the difference between the first engine torque and the second engine torque is small, less than At the preset engine torque threshold, the electromagnetic clutch coil can be determined to be faulty, and a prompt to check the working condition of the electromagnetic clutch coil can be output, and the fault of the clutch coil can be found in time to ensure the normal operation of the electromagnetic fan.

Optionally, before detecting that the electronic control unit is powered on, the accelerator opening is 0, and the vehicle speed is 0, the method further includes:

Step 10: Detect whether a short-circuit fault or an open-circuit fault occurs in the connection path between the first relay and the first control port, and the connection path between the second relay and the second control port;

Step 11: If it is detected that the connection path between the first relay and the first control port and the connection path between the second relay and the second control port do not have an open-circuit fault or a short-circuit fault, the control continues to execute the electromagnetic fan detection process.

Specifically, before step 101, that is, triggering the detection of the electromagnetic fan, it is possible to first detect whether there is a short-circuit fault or an open-circuit fault in the connection path between the first relay and the first control port and the connection path between the second relay and the second control port , When there is a short-circuit fault or an open-circuit fault, the electromagnetic fan cannot be detected normally. Therefore, when the connection path between the first relay and the first control port and the connection path between the second relay and the second control port have no short-circuit fault or open circuit In the event of a fault, the control continues to perform the detection process for the electromagnetic fan.

Optionally, the detection method further includes:

Step 12. If it is detected that the connection path between the first relay and the first control port and/or the connection path between the second relay and the second control port has an open-circuit fault or a short-circuit fault, control the connection between the first relay and the first control port The fault of the path and/or the connection path between the second relay and the second control port is reported as an error, and the detection process for the electromagnetic fan is controlled to exit.

If the connection path between the first relay and the first control port and/or the connection path between the second relay and the second control port has an open circuit fault or a short circuit fault, the control will report an error to the specific fault of the faulty connection path, so that the maintenance personnel can Provide reference, facilitate maintenance, and control the detection process of electromagnetic fans.

In the technical solution of this embodiment, after judging that the electromagnetic clutch of the electromagnetic fan is abnormally connected, the control port for sending the conduction command is adjusted in time, so that the electromagnetic fan can be operated normally without changing the wiring of the whole vehicle, so as to ensure the heat dissipation of the vehicle. The normal operation of the system; and after it is determined that the electromagnetic clutch of the electromagnetic fan is abnormal, the fault state of the electromagnetic clutch coil can be judged by the difference between the first engine torque and the second engine torque, and the aging of the electromagnetic clutch coil can be found in time. and before judging the plug-in state of the electromagnetic clutch, by detecting the connection path between the first relay and the first control port, the connection path between the second relay and the second control port, the conventional fault detection of the control system of the electromagnetic fan is realized .

Embodiment 3

FIG. 3 is a schematic structural diagram of a detection device for an electromagnetic fan according to Embodiment 3 of the present invention. This embodiment is applicable to the detection of an electromagnetic fan. The detection device is applied to a control system of an electromagnetic fan. The control system of the fan includes an electromagnetic fan, an electronic control unit and an engine, and the detection device includes:

The control module 220 is used to control the electromagnetic fan to adjust to the first rotational speed mode and obtain the first engine torque of the engine when it is detected that the electronic control unit is powered on, the accelerator opening is 0, and the vehicle speed is 0, and then controls the electromagnetic fan to adjust is a second rotational speed mode and obtains a second engine torque of the engine, wherein the preset rotational speed value in the first rotational speed mode is smaller than the preset rotational speed value in the second rotational speed mode;

The determination module 230 is configured to determine that the connection state of the electromagnetic clutch of the electromagnetic fan is abnormal if it is detected that the first engine torque is greater than the second engine torque.

On the basis of the above solution, optionally, the determination module 230 is further configured to determine that the electromagnetic clutch of the electromagnetic fan is in a normal connection state if the first engine torque is less than the second engine torque.

On the basis of the above solution, optionally, the detection device further includes a trigger detection module 210, which is used to detect whether the electronic control unit receives the first engine torque before controlling the electromagnetic fan to adjust to the first rotation speed mode and obtaining the first engine torque of the engine. The trigger instruction for detecting the electromagnetic fan, if yes, the control continues to execute the detection process of the electromagnetic fan.

This embodiment provides a detection device for an electromagnetic fan. After the electronic control unit is powered on through the control module, the electromagnetic fan is controlled to adjust to the first position when the accelerator opening is 0 and the vehicle speed is 0, that is, there is no other load. Speed mode and obtain the first engine torque of the engine, and then control the electromagnetic fan to adjust to the second speed mode and obtain the second engine torque of the engine, wherein the preset speed value in the first speed mode is smaller than the preset speed value in the second speed mode. Set the speed value, so under the condition that the electromagnetic fan control system is connected normally, the power required for the electromagnetic fan to operate in the first speed mode should be less than the power required for the electromagnetic fan to operate in the second speed mode, that is, the first engine torque should be less than the second engine torque. Therefore, if it is detected that the first engine torque is greater than the second engine torque, the determination module determines that the electromagnetic clutch of the electromagnetic fan is in an abnormal state. The embodiment of the present invention solves the situation that the electronic control unit in the prior art cannot detect that the relay for controlling the medium-speed operation of the electromagnetic fan and the relay for controlling the high-speed operation of the electromagnetic fan are reversely connected to the corresponding control pins, which causes a problem to the vehicle cooling system. Affect the problem, realize the detection of the electromagnetic fan, find out the abnormal situation of the electromagnetic clutch of the electromagnetic fan in time, and then ensure the normal operation of the vehicle cooling system.

Embodiment 4

FIG. 4 is a schematic structural diagram of an electromagnetic fan detection device according to Embodiment 4 of the present invention. This embodiment further provides an optional electromagnetic fan detection device on the basis of the third embodiment.

Optionally, the control system of the electromagnetic fan further includes a first relay and a second relay, and the electronic control unit includes a first control port and a second control port;

The control module 220 is configured to send a first conduction instruction to the first relay electrically connected to the first control port through the first control port to make the electromagnetic fan run according to the first rotational speed mode, and is also configured to send the first relay through the second control port to the first relay. The second relay electrically connected to the second control port sends a second conduction command to make the electromagnetic fan operate according to the second rotation speed mode.

Optionally, the detection device further includes: a correction module 240, the correction module 240 is configured to send a second conduction command to the first relay through the first control port after determining that the electromagnetic clutch of the electromagnetic fan is in an abnormal state, so that the electromagnetic The fan operates according to the second rotation speed mode, and sends a first conduction command to the second relay through the second control port to make the electromagnetic fan operate according to the first rotation speed mode.

Optionally, the detection device further includes: a clutch coil failure determination module 250, configured to, after determining that the electromagnetic clutch of the electromagnetic fan is abnormal, if the difference between the first engine torque and the second engine torque is less than the engine torque threshold, Determine the clutch coil failure, and output a prompt to check the clutch coil operation.

Optionally, the detection device further includes: a circuit fault detection module 260 for detecting the connection path between the first relay and the first control port before detecting that the electronic control unit is powered on, the accelerator opening is 0, and the vehicle speed is 0 , and whether a short-circuit fault or an open-circuit fault occurs in the connection path between the second relay and the second control port;

If it is detected that the connection path between the first relay and the first control port and the connection path between the second relay and the second control port do not have an open-circuit fault or a short-circuit fault, the control continues to execute the electromagnetic fan detection process.

Optionally, the circuit fault detection module 260 is further configured to control the detection of the first relay and the first control port and/or the connection path between the second relay and the second control port if there is an open circuit fault or a short circuit fault. An error is reported in the connection path between a relay and the first control port and/or the connection path between the second relay and the second control port, and the detection process for the electromagnetic fan is controlled to exit.

In the electromagnetic fan detection device provided by this embodiment, after judging that the electromagnetic clutch of the electromagnetic fan is abnormally connected, the correction module adjusts the control port for sending the conduction command in time, so that the electromagnetic fan can be adjusted without changing the wiring of the whole vehicle. normal operation to ensure the normal operation of the vehicle cooling system; and after determining that the electromagnetic clutch of the electromagnetic fan is abnormal, the electromagnetic clutch coil is judged by the difference between the first engine torque and the second engine torque of the clutch coil fault judgment module. state, the aging of the electromagnetic clutch coil can be found in time; and before judging the connection state of the electromagnetic clutch, the circuit fault detection module detects the connection path between the first relay and the first control port, and the connection between the second relay and the second control port. The connection path realizes the conventional fault detection of the control system of the electromagnetic fan.

Embodiment 5

FIG. 5 is a schematic structural diagram of a detection system for an electromagnetic fan according to Embodiment 5 of the present invention. This embodiment is applicable to the case of detecting an electromagnetic fan. The detection system 50 includes the electromagnetic fan detection device 200 , the electronic control unit 20 , the electromagnetic fan 30 and the engine 40 provided in any of the above embodiments. The detection device 200 of the electromagnetic fan is integrated in the electronic control unit 20 .

This embodiment provides a detection system for an electromagnetic fan. After the electronic control unit is powered on through the control module, the electromagnetic fan is controlled to adjust to the first position when the accelerator opening is 0 and the vehicle speed is 0, that is, there is no other load. Speed mode and obtain the first engine torque of the engine, and then control the electromagnetic fan to adjust to the second speed mode and obtain the second engine torque of the engine, wherein the preset speed value in the first speed mode is smaller than the preset speed value in the second speed mode. Set the speed value, so under the condition that the electromagnetic fan control system is connected normally, the power required for the electromagnetic fan to operate in the first speed mode should be less than the power required for the electromagnetic fan to operate in the second speed mode, that is, the first engine torque should be less than the second engine torque. Therefore, if it is detected that the first engine torque is greater than the second engine torque, the determination module determines that the electromagnetic clutch of the electromagnetic fan is abnormally connected. The embodiment of the present invention solves the situation that the electronic control unit in the prior art cannot detect that the relay for controlling the medium-speed operation of the electromagnetic fan and the relay for controlling the high-speed operation of the electromagnetic fan are reversely connected to the corresponding control pins, which causes a problem to the vehicle cooling system. Affect the problem, realize the detection of the electromagnetic fan, and find out the abnormal situation of the electromagnetic clutch connection state of the electromagnetic fan in time, thereby ensuring the normal operation of the vehicle cooling system.

Note that the above are only preferred embodiments of the present invention and applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and can also include more other equivalent embodiments without departing from the concept of the present invention. The scope is determined by the scope of the appended claims.

Claims (16)

1. A detection method for an electromagnetic fan, wherein the detection method is applied in a control system of an electromagnetic fan, and the control system of the electromagnetic fan comprises an electromagnetic fan, an electronic control unit and an engine, and the detection method comprises: When it is detected that the electronic control unit is powered on, the accelerator opening is 0, and the vehicle speed is 0, the electromagnetic fan is controlled to be adjusted to a first rotational speed mode and the first engine torque of the engine is obtained, and then the electromagnetic fan is controlled. adjusting the fan to a second rotational speed mode and obtaining a second engine torque of the engine, wherein a preset rotational speed value in the first rotational speed mode is smaller than a preset rotational speed value in the second rotational speed mode; If it is detected that the first engine torque is greater than the second engine torque, it is determined that the electromagnetic clutch of the electromagnetic fan is in an abnormal connection state; After determining that the electromagnetic clutch of the electromagnetic fan is abnormally connected, the method further includes: If the difference between the first engine torque and the second engine torque is less than an engine torque threshold, it is determined that the electromagnetic clutch coil is faulty, and a prompt for checking the operation of the electromagnetic clutch coil is output. 2. The detection method according to claim 1, wherein the control system of the electromagnetic fan further comprises a first relay and a second relay, and the electronic control unit comprises a first control port and a second control port; The specific execution process of controlling the electromagnetic fan to adjust to the first rotational speed mode is: sending a first conduction instruction to the first relay electrically connected to the first control port through the first control port to make the electromagnetic fan operates according to the first rotational speed mode; The specific execution process of controlling the electromagnetic fan to adjust to the second rotational speed mode is as follows: sending a second conduction instruction to the second relay electrically connected to the second control port through the second control port to enable the The electromagnetic fan operates according to the second rotational speed mode. 3 . The detection method according to claim 2 , wherein after determining that the electromagnetic clutch of the electromagnetic fan is in an abnormal state, the method further comprises: 3 . Send a second conduction command to the first relay through the first control port to make the electromagnetic fan run in a second rotational speed mode; and send a second conduction command to the second relay through the second control port A turn-on command enables the electromagnetic fan to operate according to the first rotational speed mode. 4. detection method according to claim 1, is characterized in that, also comprises: If the first engine torque is smaller than the second engine torque, it is determined that the electromagnetic clutch of the electromagnetic fan is in a normal state. 5. The detection method according to claim 2, wherein before detecting that the electronic control unit is powered on, the accelerator opening is 0, and the vehicle speed is 0, the method further comprises: Detecting whether a short-circuit fault or an open-circuit fault occurs in the connection path between the first relay and the first control port, and the connection path between the second relay and the second control port; If it is detected that the connection path between the first relay and the first control port and the connection path between the second relay and the second control port do not have the open-circuit fault or short-circuit fault, the control continues to execute on the The detection process of the electromagnetic fan. 6 . The detection method according to claim 5 , wherein if the connection path between the first relay and the first control port and/or the connection between the second relay and the second control port is detected. 7 . The connection path has the open-circuit fault or short-circuit fault, and control is performed on the fault existing in the connection path between the first relay and the first control port and/or the connection path between the second relay and the second control port. Report an error, and control to exit the electromagnetic fan detection process. 7 . The detection method according to claim 1 , wherein before controlling the electromagnetic fan to adjust to a first rotational speed mode and acquiring the first engine torque of the engine, the method further comprises: 8 . It is detected whether the electronic control unit has received a trigger instruction to detect the electromagnetic fan, and if so, the control continues to execute the detection process of the electromagnetic fan. 8. A detection device for an electromagnetic fan, wherein the detection device is applied in a control system of an electromagnetic fan, the control system for the electromagnetic fan comprises an electromagnetic fan, an electronic control unit and an engine, and the detection device comprises: a control module, configured to control the electromagnetic fan to adjust to a first rotational speed mode and obtain a first engine torque of the engine when it is detected that the electronic control unit is powered on, the accelerator opening is 0, and the vehicle speed is 0, Then control the electromagnetic fan to adjust to the second rotational speed mode and obtain the second engine torque of the engine, wherein the preset rotational speed value in the first rotational speed mode is smaller than the preset rotational speed value in the second rotational speed mode ; a determination module, configured to determine that the electromagnetic clutch of the electromagnetic fan is abnormal if it is detected that the first engine torque is greater than the second engine torque; The detection device further includes: a clutch coil failure judgment module, which is used for, after judging that the electromagnetic clutch connection state of the electromagnetic fan is abnormal, if the difference between the first engine torque and the second engine torque is less than the engine torque Threshold value, determine the clutch coil failure, and output a prompt to check the working condition of the clutch coil. 9. The detection device according to claim 8, wherein the control system of the electromagnetic fan further comprises a first relay and a second relay, and the electronic control unit comprises a first control port and a second control port; The control module is configured to send a first conduction instruction to the first relay electrically connected to the first control port through the first control port, so that the electromagnetic fan operates according to the first rotational speed mode, and further for sending a second conduction command to the second relay electrically connected to the second control port through the second control port, so that the electromagnetic fan operates according to the second rotation speed mode. 10 . The detection device according to claim 9 , further comprising: a correction module, the correction module is configured to pass the first control port through the first control port after determining that the electromagnetic clutch of the electromagnetic fan is in an abnormal state. 11 . Sending a second conduction command to the first relay to make the electromagnetic fan operate in a second rotational speed mode, and sending a first conduction command to the second relay through the second control port to make all the The electromagnetic fan operates according to the first rotational speed mode. 11 . The detection device according to claim 8 , wherein the determination module is further configured to determine that the electromagnetic clutch of the electromagnetic fan is connected and connected if the first engine torque is smaller than the second engine torque. 12 . Status is normal. 12 . The detection device according to claim 9 , further comprising: a circuit fault detection module, configured to detect all faults before detecting that the electronic control unit is powered on, the accelerator opening is 0, and the vehicle speed is 0. 13 . Whether a short-circuit fault or an open-circuit fault occurs in the connection path between the first relay and the first control port, and the connection path between the second relay and the second control port; If it is detected that the connection path between the first relay and the first control port and the connection path between the second relay and the second control port do not have the open-circuit fault or short-circuit fault, the control continues to execute on the The detection process of the electromagnetic fan. 13. The detection device according to claim 12, wherein the circuit fault detection module is further configured to detect the connection path between the first relay and the first control port and/or the second The open-circuit fault or short-circuit fault exists in the connection path between the relay and the second control port, and control the connection path between the first relay and the first control port and/or the second relay and the second control port If there is a fault in the connection path of the control port, an error will be reported, and the detection process of the electromagnetic fan will be controlled to exit. 14 . The detection device according to claim 8 , further comprising a trigger detection module, for detecting the detection of the electromagnetic fan before the electromagnetic fan is controlled to be adjusted to a first rotational speed mode and the first engine torque of the engine is obtained. 15 . Whether the electronic control unit receives a trigger instruction to detect the electromagnetic fan, if so, the control continues to execute the detection process of the electromagnetic fan. 15. An electromagnetic fan detection system, characterized in that it comprises the electromagnetic fan detection device according to any one of claims 8-14, an electronic control unit, an electromagnetic fan and a motor. 16. The detection system according to claim 15, wherein the detection device of the electromagnetic fan is integrated in the electronic control unit.

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