CN111120132B - Method and system for adjusting oil injection quantity according to axial force of belt pulley - Google Patents

Abstract

The invention provides a method and a system for adjusting the fuel injection amount according to the axial force of the pulley, and relates to the field of vehicles. The present invention firstly detects the axial force of the pulley in the generator, and then executes a strategy of limiting fuel injection when it is determined that the pulley is abnormal according to the axial force. In the present invention, since the change of the axial force of the generator pulley is approximately the change of the torque of the generator pulley, the torque change of the pulley can be known by detecting the axial force of the generator pulley. The present invention limits the power of the engine when the pulley is abnormal by limiting the fuel injection method. , to ensure vehicle safety.

Description

Method and system for adjusting fuel injection amount according to pulley axial force

technical field

The invention relates to the field of vehicles, in particular to a method and a system for adjusting the fuel injection amount according to the axial force of the pulley.

Background technique

The generator pulley transmits the kinetic energy of the crankshaft pulley to the generator through the belt. During the rotation of the generator, the rotor cuts the magnetic field lines and generates direct current. Therefore, the generator pulley is an important part of the generator. However, the torque of the generator pulley is an important technical parameter. If the torque of the generator pulley cannot be detected well, the torque will be attenuated, which will cause the pulley to fall off. The torque detection problem will lead to normal driving.

In the prior art, the torque of the generator pulley cannot be accurately detected, so it is impossible to make a reminder when the pulley is abnormal and to ensure the normal operation of the whole vehicle through a control strategy.

SUMMARY OF THE INVENTION

The purpose of the first aspect of the present invention is to provide a method for adjusting the fuel injection amount according to the axial force of the pulley, so as to solve the problem in the prior art that the vehicle cannot work normally due to the inability to make corresponding parameter adjustments when the generator pulley is abnormal. .

A further object of the first aspect of the present invention is to reduce the false positive rate.

The purpose of the second aspect of the present invention is to provide a system for adjusting the fuel injection amount according to the axial force of the pulley.

According to the purpose of the first aspect of the present invention, the present invention provides a method for adjusting the fuel injection amount according to the axial force of the pulley, comprising:

Detect the axial force of the pulley in the generator;

Judging whether the pulley is abnormal according to the axial force;

If so, implement a limited fuel injection strategy.

Optionally, judging whether the pulley is abnormal according to the axial force, including:

Calculate the torque of the pulley according to the detected axial force;

comparing the torque with the bolt allowable torque comparison table stored in the preset memory module;

When the torque is lower than the allowable torque of the bolt, it is determined that the pulley is abnormal.

Optionally, implement a limited fuel injection strategy, including:

controlling the fuel injector to reduce the fuel injection quantity to a preset threshold fuel injection quantity, wherein the preset threshold fuel injection quantity is greater than zero;

Detect the axial force of the pulley again;

Calculate the torque of the pulley according to the axial force and compare it with the bolt allowable torque table;

When the torque is still lower than the allowable torque of the bolt, continue to control the fuel injector to reduce the fuel injection amount until the torque calculated according to the detected axial force is greater than or equal to the allowable torque .

Optionally, after detecting the axial force of the pulley again, the method further includes:

When the axial force does not change, it is determined that the pulley is not abnormal.

Optionally, when it is determined that the pulley is abnormal, the engine fault light on the instrument panel of the vehicle is turned on.

According to the purpose of the second aspect of the present invention, the present invention also provides a system for adjusting the fuel injection amount according to the axial force of the pulley, comprising a detection unit and a control unit,

the detection unit, for detecting the axial force of the pulley in the generator and sending the axial force to the control unit;

The control unit, connected with the detection unit, is configured to execute a limited fuel injection strategy when it is determined according to the axial force that the pulley is abnormal.

Optionally, the detection unit is configured to calculate the torque of the pulley according to the detected axial force, and then compare the torque with the bolt allowable torque comparison table stored in the preset storage module. , and when the torque is lower than the allowable torque of the bolt, it is determined that the pulley is abnormal, wherein the preset storage module is provided in the control unit.

Optionally, it also includes a fuel injector connected to the control unit,

The control unit is further configured to control the fuel injector to reduce the fuel injection amount to a preset threshold fuel injection amount, and then detect the axial force of the pulley again, and then calculate the pulley according to the axial force When the torque is still lower than the allowable torque of the bolt, continue to control the fuel injector to reduce the fuel injection amount until the shaft is detected according to the detected torque. The torque calculated by the force calculation is greater than or equal to the allowable torque, wherein the preset threshold fuel injection amount is greater than zero.

Optionally, the control unit is further configured to, after controlling the fuel injector to reduce the fuel injection amount to the preset threshold fuel injection amount, when the axial force of the pulley detected again does not change It is determined that the pulley is not abnormal.

Optionally, the control unit is further configured to turn on the engine fault light on the instrument panel of the vehicle when it is determined that the pulley is abnormal.

The invention firstly detects the axial force of the pulley in the generator, and then executes the strategy of limiting fuel injection when it is determined that the pulley is abnormal according to the axial force. In the present invention, since the change of the axial force of the generator pulley is approximately the change of the torque of the generator pulley, the torque change of the pulley can be known by detecting the axial force of the generator pulley. In the present invention, the method of limiting the fuel injection limits the power of the engine when the pulley is abnormal. , to ensure vehicle safety.

Further, the present invention controls the fuel injector to reduce the fuel injection amount to the preset threshold fuel injection amount and detects the axial force of the pulley again. If the axial force of the pulley does not change, it is considered that the pulley is not abnormal. The present invention detects the axial force again after adjusting the fuel injection amount, which can reduce the misjudgment rate.

The above and other objects, advantages and features of the present invention will be more apparent to those skilled in the art from the following detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings.

Description of drawings

Hereinafter, some specific embodiments of the present invention will be described in detail by way of example and not limitation with reference to the accompanying drawings. The same reference numbers in the figures designate the same or similar parts or parts. It will be understood by those skilled in the art that the drawings are not necessarily to scale. In the attached picture:

FIG. 1 is a schematic flow chart of a method for adjusting the fuel injection amount according to the axial force of the pulley according to an embodiment of the present invention;

Fig. 2 is a schematic flow chart of a method for adjusting the fuel injection amount according to the pulley axial force according to another embodiment of the present invention;

3 is a schematic structural diagram of a system for adjusting the fuel injection amount according to the pulley axial force according to an embodiment of the present invention;

4 is a schematic structural diagram of a system for adjusting the fuel injection amount according to the pulley axial force according to another embodiment of the present invention.

Detailed ways

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present invention and should not be construed as limiting the present invention.

FIG. 1 is a schematic flowchart of a method for adjusting the fuel injection amount according to the pulley axial force according to an embodiment of the present invention. As shown in FIG. 1, in a specific embodiment, the method for adjusting the fuel injection amount according to the axial force of the pulley may generally include the following steps:

S10, detect the axial force of the pulley in the generator;

S20, judge whether the pulley is abnormal according to the axial force;

S30, if yes, execute the limited fuel injection strategy.

In the present invention, since the change of the axial force of the generator pulley is approximately the change of the torque of the generator pulley, the torque change of the pulley can be known by detecting the axial force of the generator pulley. In the present invention, the method of limiting the fuel injection limits the power of the engine when the pulley is abnormal. , to ensure vehicle safety.

FIG. 2 is a schematic flowchart of a method for adjusting the fuel injection amount according to the pulley axial force according to another embodiment of the present invention. As shown in Figure 2, S20 specifically includes the following steps:

Step 1: Calculate the torque of the pulley according to the detected axial force;

Step 2: Compare the torque with the allowable bolt torque comparison table stored in the preset memory module;

Step 3: When the torque is lower than the allowable torque of the bolt, it is determined that the pulley is abnormal.

Among them, the pulley is sleeved on the generator shaft, and the generator shaft is equivalent to a bolt. The bolt allowable torque comparison table contains the allowable torque corresponding to different bolt types. After calculating the torque, compare the torque with the bolt, which is the generator. The allowable torque corresponding to the crankshaft is compared, and when the torque is lower than the allowable torque of the generator shaft, it is determined that the pulley is abnormal.

The present invention considers that different bolts have different allowable torques, so the torque calculated according to the axial force is compared with the bolt allowable torque comparison table, which improves the accuracy of judging whether the pulley is abnormal.

Further, S30 includes:

Step 4: control the fuel injector to reduce the fuel injection quantity to a preset threshold fuel injection quantity, wherein the preset threshold fuel injection quantity is greater than zero;

Step 5: Check the axial force of the pulley again;

Step 6: Calculate the torque of the pulley according to the axial force and compare it with the bolt allowable torque table;

Step 7: When the torque is still lower than the allowable torque of the bolt, continue to control the injector to reduce the fuel injection amount until the torque calculated according to the detected axial force is greater than or equal to the allowable torque.

It can be understood that after controlling the injector to reduce the fuel injection amount to the preset threshold fuel injection amount, it returns to step 1, and through repeated detection of the axial force, torque comparison, and adjustment of the fuel injection amount until the calculation is performed according to the detected axial force. The resulting torque is greater than or equal to the allowable torque.

In another embodiment, it is determined that there is no abnormality in the pulley when it is detected again that the axial force of the pulley has not changed. The invention detects the axial force again after adjusting the fuel injection amount, which can reduce the misjudgment rate and increase the reliability.

The present invention knows whether the generator pulley has the risk of falling off by monitoring the axial force of the generator pulley, so as to ensure the normal operation of the generator and the engine, thereby ensuring the normal operation of the whole vehicle. When it is detected that the axial force has a tendency to decay, the torque is calculated according to the axial force, and when the torque is lower than the allowable torque of the bolt, it is determined that the pulley is abnormal. Limit fuel injection strategy. The fuel injection limitation strategy is not to terminate the fuel injection immediately, but to make a logical judgment through the real-time axial force data, and gradually control the fuel injection amount to ensure that the whole vehicle is lowered to a safe working condition slowly and orderly.

Specifically, when the axial force of the pulley is not abnormal, that is, the fuel injection amount in the fuel injection unit of the vehicle is Q in the normal working state. When the axial force of the pulley is abnormal, the injector is controlled to reduce the fuel injection amount to The preset threshold fuel injection quantity λQ, where 0<λ<1, that is to say, λ cannot be zero instantaneously, the purpose is to ensure the smooth deceleration of the whole vehicle during normal driving, and finally stop safely. By repeatedly detecting the axial force, torque comparison, and adjusting the fuel injection amount until the torque calculated according to the detected axial force is greater than or equal to the allowable torque, stop reducing the fuel injection amount to ensure the safety of the whole vehicle. After the engine is turned off or restarted, the generator pulley torque is abnormal.

Fig. 3 is a schematic structural diagram of a system for adjusting fuel injection quantity according to pulley axial force according to an embodiment of the present invention, and Fig. 4 is a schematic diagram of a system for adjusting fuel injection quantity according to pulley axial force according to another embodiment of the present invention Structure diagram. As shown in FIGS. 3-4 , in a specific embodiment, the system for adjusting the fuel injection amount according to the axial force of the pulley 2 includes a detection unit 1 and a control unit 3 . The detection unit 1 is used to detect the axial force of the pulley 2 in the generator and send the axial force to the control unit 3. The control unit 3 is connected to the detection unit 1 and is used to determine the abnormality of the pulley 2 according to the axial force and execute the limited fuel injection strategy. Wherein, the detection unit 1 is a pressure sensor, which is arranged between the nut 5 and the pulley 2 for detecting the axial force of the pulley 2 .

Specifically, the detection unit 1 is configured to calculate the torque of the pulley 2 according to the detected axial force, and then compare the torque with the bolt allowable torque comparison table stored in the preset memory module, and when the torque is lower than the bolt's allowable torque When the allowable torque is used, it is determined that the pulley 2 is abnormal, wherein the preset storage module is set in the control unit 3 .

Further, the system for adjusting the fuel injection quantity according to the axial force of the pulley 2 further comprises a fuel injector 4 connected with the control unit 3, and the control unit 3 is further configured to control the fuel injector 4 to reduce the fuel injection quantity to a preset threshold fuel injection. Then check the axial force of the pulley 2 again, and then calculate the torque of the pulley 2 according to the axial force and compare it with the allowable torque of the bolts. When the torque is still lower than the allowable torque of the bolts, continue to control the injector 4 The fuel injection quantity is reduced until the torque calculated according to the detected axial force is greater than or equal to the allowable torque, wherein the preset threshold fuel injection quantity is greater than zero.

The control unit 3 is further configured to determine that the pulley 2 is not abnormal when the axial force of the pulley 2 detected again does not change after controlling the fuel injector 4 to reduce the fuel injection amount to the preset threshold fuel injection amount. 2 Turn on the engine fault light on the instrument panel of the vehicle when an abnormality occurs.

During the low-speed operation of the vehicle, since the reverse torque of the generator pulley 2 is small, the control unit 3 compares the axial force value fed back by the pressure sensor to increase the data error tolerance rate, prevent misjudgment, and limit the power of the vehicle. At this time, the forced detection of the 2-axis force of the generator pulley, that is, the torque, is used as one of the detection failures of the whole vehicle. When the detection torque is unreasonable, the vehicle engine fault light is always on, and the fuel injection of the injector 4 is restricted.

Under the conditions of high speed, acceleration and rapid deceleration, the reverse torque of the generator pulley 2 is relatively large. The control unit 3 increases the frequency of the axial force comparison to reduce the data fault tolerance rate. When the abnormal axial force is found, it adopts a slow iterative method to reduce the Fuel injection quantity, determine the optimal fuel injection quantity, and ensure the safety of the whole vehicle.

By now, those skilled in the art will recognize that although various exemplary embodiments of the present invention have been shown and described in detail herein, the present invention may still be implemented in accordance with the present disclosure without departing from the spirit and scope of the present invention. The content directly determines or derives many other variations or modifications consistent with the principles of the invention. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims (8)

1. A method of adjusting an amount of injected fuel based on a pulley axial force, comprising:

detecting the axial force of a belt pulley in the generator;

judging whether the belt pulley is abnormal or not according to the axial force;

if yes, executing a fuel injection limiting strategy;

judging whether the belt pulley is abnormal or not according to the axial force, comprising the following steps:

calculating the torque of the belt pulley according to the detected shaft force;

comparing the torque with a bolt allowable torque comparison table stored in a preset storage module;

and judging that the pulley is abnormal when the torque is lower than the allowable torque of the bolt.

2. The method of claim 1, wherein implementing a limited injection strategy comprises:

controlling the oil injector to reduce the oil injection quantity to a preset threshold oil injection quantity, wherein the preset threshold oil injection quantity is greater than zero;

detecting the axial force of the belt pulley again;

calculating the torque of the belt pulley according to the axial force and comparing the torque with the bolt allowable torque comparison table;

and when the torque is still lower than the allowable torque of the bolt, continuously controlling the oil injector to reduce the oil injection amount until the torque calculated according to the detected axial force is larger than or equal to the allowable torque.

3. The method of claim 2, wherein after again detecting the axial force of the pulley further comprises:

and when the axial force is not changed, judging that the belt pulley is not abnormal.

4. The method of claim 1,

and when the belt pulley is judged to be abnormal, an engine fault lamp on the instrument panel of the whole vehicle is turned on.

5. A system for adjusting oil injection quantity according to the axial force of a belt pulley is characterized by comprising a detection unit and a control unit,

the detection unit is used for detecting the axial force of a belt pulley in the generator and sending the axial force to the control unit;

the control unit is connected with the detection unit and used for judging whether the belt pulley is abnormal according to the axial force and executing an oil injection limiting strategy;

the detection unit is configured to calculate the torque of the belt pulley according to the detected axial force, compare the torque with a bolt allowable torque comparison table stored in a preset storage module, and judge that the belt pulley is abnormal when the torque is lower than the bolt allowable torque, wherein the preset storage module is arranged in the control unit.

6. The system of claim 5, further comprising a fuel injector connected to the control unit,

the control unit is further configured to control the oil injector to reduce the oil injection amount to a preset threshold oil injection amount, detect the axial force of the belt pulley again, calculate the torque of the belt pulley according to the axial force and compare the torque with the bolt allowable torque comparison table, and when the torque is still lower than the bolt allowable torque, continue to control the oil injector to reduce the oil injection amount until the torque calculated according to the detected axial force is greater than or equal to the allowable torque, wherein the preset threshold oil injection amount is greater than zero.

7. The system of claim 6,

the control unit is further configured to determine that the pulley is not abnormal when the detected axial force of the pulley is not changed after the fuel injector is controlled to reduce the fuel injection amount to the preset threshold fuel injection amount.

8. The system of claim 5,

and the control unit is also configured to light an engine fault lamp on an instrument panel of the whole vehicle when the belt pulley is judged to be abnormal.

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