CN114876690B - A fuel injector fault detection device and fuel injector fault detection method - Google Patents

Abstract

The invention belongs to the technical field of fault detection, and discloses a fault detection device and a fault detection method for an oil sprayer. The fault detection device of the fuel injector comprises a detection system and a controller, wherein the detection system comprises a hydraulic pump, a pressure accumulation box and a pressure sensor, the hydraulic pump is communicated with the pressure accumulation box, the pressure accumulation box is communicated with the fuel injector, and the pressure sensor is arranged in the pressure accumulation box and is used for monitoring the oil pressure of the pressure accumulation box; the controller is electrically connected with the pressure sensor and the oil sprayer, and the controller can control the oil sprayer to spray oil according to the electric signal of the pressure sensor. The fault detection device for the fuel injector is simple in structure, high in detection accuracy and convenient to operate.

Description

A fuel injector fault detection device and a fuel injector fault detection method

technical field

The invention relates to the technical field of fault detection, in particular to a fuel injector fault detection device and a fuel injector fault detection method.

Background technique

As a fuel injection technology with high efficiency, low power consumption and light emission, high-pressure common rail technology has become an important development direction of engines. Among them, the electronically controlled fuel injector is one of the most complex and important components in the high-pressure common rail fuel injection system. The fuel injection timing, fuel injection quantity and fuel injection rate are injected into the combustion chamber. Once the fuel injector breaks down, it will directly affect the safety and reliability of the diesel engine. Fast and accurate fault diagnosis can improve injector performance and reduce maintenance cost, which has important engineering value.

In the prior art, it judges whether the fuel injector is faulty by the volume change of the fuel in the fuel tank of the fuel injector of the engine system before and after fuel injection, but there is no special detection of whether the fuel injector is faulty in the prior art detection device.

Contents of the invention

The object of the present invention is to provide a fuel injector failure detection device and a fuel injector failure detection method to solve the problem that there is no detection device for detecting whether a fuel injector is faulty in the prior art.

For reaching this purpose, the present invention adopts following technical scheme:

A fuel injector fault detection device, comprising:

A detection system, the detection system includes a hydraulic pump, a pressure storage tank and a pressure sensor, the hydraulic pump communicates with the pressure storage tank, the pressure storage tank communicates with the fuel injector, and the pressure sensor is arranged in the pressure storage tank And it is used to monitor the oil pressure of the pressure accumulator;

A controller, the controller is electrically connected to both the pressure sensor and the fuel injector, and the controller can control the fuel injection of the fuel injector according to the electrical signal of the pressure sensor.

Preferably, the detection system further includes a pressure relief valve, and the pressure relief valve communicates with the pressure storage tank.

Preferably, the fuel injector failure detection device further includes an oil tank, the hydraulic pump is also communicated with the oil tank, and the pressure relief valve is also communicated with the oil tank.

Preferably, the hydraulic pump is an electric pump.

Preferably, the fuel injector fault detection device further includes an alarm, and the alarm is electrically connected to the controller.

A fuel injector fault detection method applied to the above-mentioned fuel injector fault detection device, the fuel injector fault detection method comprising:

Measure whether the resistance of the fuel injector is within the range of the set resistance value;

If the resistance of the fuel injector is within the range of the set resistance value, the hydraulic pump is controlled to pump oil to the pressure accumulator;

Judging whether the oil pressure value of the pressure accumulator tank is greater than or equal to the set oil pressure value;

If the oil pressure value of the pressure accumulator tank is greater than or equal to the set oil pressure value, the hydraulic pump is controlled to stop pumping oil, and it is judged whether the fuel injector is faulty according to the drop rate of the oil pressure of the pressure accumulator tank.

Preferably, if the resistance value of the fuel injector is not within the range of the set resistance value, it means that the resistance of the fuel injector is abnormal and the fuel injector is faulty.

Preferably, if the oil pressure value of the pressure accumulator tank is less than the set oil pressure value, it is judged whether the duration of the hydraulic pump pumping oil is greater than or equal to the set duration;

If the duration of the hydraulic pump pumping oil is greater than or equal to the set duration, it indicates that the detection system is faulty.

Preferably, the specific steps of judging whether the fuel injector is faulty according to the drop rate of the oil pressure of the pressure accumulator include:

Power on the fuel injector and control the fuel injection of the fuel injector;

judging whether the descending speed is within the set descending speed range;

If the descending speed is within the set descending speed range, it means that the injector is normal;

If the descending speed is not within the set descending speed range, it indicates that the fuel injector is faulty.

Preferably, the detection system further includes a pressure relief valve. If the oil pressure value of the pressure accumulator tank is greater than the set oil pressure value, the pressure relief valve will work until the oil pressure in the pressure accumulator tank exceeds the set value. The value is equal to the set oil pressure value.

Beneficial effects of the present invention:

The object of the present invention is to provide a fuel injector fault detection device and a fuel injector fault detection method. Wherein, the fuel injector fault detection device includes a detection system and a controller. When it is necessary to detect whether the fuel injector is faulty, the hydraulic pump is controlled to pump hydraulic oil into the pressure accumulator until the oil pressure of the oil in the pressure accumulator reaches The value is greater than or equal to the set oil pressure value. At this time, the hydraulic pump is controlled to stop pumping hydraulic oil, and the fuel injector is powered on. The controller controls the fuel injector to inject oil, and detects the oil pressure in the pressure accumulator after the injector starts to inject oil. Whether the descending speed of the fuel injector is within the set descending speed range, if the descending speed of the oil pressure in the pressure accumulator tank is within the set descending speed range after the injector injects fuel, it means that the fuel injector is not malfunctioning, and the fuel injector The fault detection device has the advantages of simple structure, high detection precision and convenient operation.

Description of drawings

Fig. 1 is a schematic structural view of a fuel injector fault detection device provided by a specific embodiment of the present invention;

Fig. 2 is a flowchart of a fuel injector fault detection method provided by a specific embodiment of the present invention.

In the picture:

100. Fuel injector;

11. Hydraulic pump; 12. Accumulator; 13. Pressure sensor; 14. First pipeline; 15. Second pipeline; 16. Pressure relief valve.

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 here 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, only some structures related to the present invention are shown in the drawings but not all structures.

In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected" and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrated ; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

In the present invention, unless otherwise clearly specified and limited, a first feature being "on" or "under" a second feature may include direct contact between the first and second features, and may also include the first and second features Not in direct contact but through another characteristic contact between them. Moreover, "above", "above" and "above" the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. "Below", "beneath" and "under" the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

In the description of this embodiment, the terms "up", "down", "right", and other orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operations, rather than indicating Or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the invention. In addition, the terms "first" and "second" are only used to distinguish in description, and have no special meaning.

The present invention provides a fuel injector fault detection device, wherein the fuel injector fault detection device includes a detection system and a controller, as shown in Figure 1, the detection system includes a hydraulic pump 11, a pressure accumulator 12 and a pressure sensor 13, The hydraulic pump 11 communicates with the accumulator tank 12, the accumulator tank 12 communicates with the fuel injector 100, the pressure sensor 13 is arranged in the accumulator tank 12 and is used to monitor the oil pressure of the accumulator tank 12; the controller communicates with the pressure sensor 13 and the injector The fuel injectors 100 are all electrically connected, and the controller can control the fuel injectors 100 to inject fuel according to the electrical signal of the pressure sensor 13 . Specifically, the hydraulic pump 11 communicates with the pressure accumulator 12 through the first pipeline 14, and the pressure accumulator 12 communicates with the fuel injector 100 through the second pipeline 15. When it is necessary to detect whether the fuel injector 100 is faulty, the hydraulic pump is controlled. 11 Pump hydraulic oil into the pressure accumulator tank 12 until the oil pressure value of the oil in the pressure accumulator tank 12 is greater than or equal to the set oil pressure value, then control the hydraulic pump 11 to stop pumping hydraulic oil, Power on, the controller controls the fuel injector 100 to inject fuel, and detects whether the drop rate of the oil pressure in the pressure storage tank 12 after the fuel injector 100 starts injecting fuel is within the set drop rate range. If the drop rate of the oil pressure in the pressure box 12 is within the set drop rate range, it means that the fuel injector 100 is not faulty. The fuel injector fault detection device has a simple structure, high detection accuracy, and is easy to operate.

Wherein, as shown in FIG. 1 , the detection system further includes a pressure relief valve 16 , and the pressure relief valve 16 communicates with the pressure accumulator tank 12 . Specifically, the pressure relief valve 16 communicates with the pressure accumulator tank 12 through a third pipeline. By setting the pressure relief valve 16, when the oil pressure value of the oil in the pressure accumulator tank 12 is greater than the set oil pressure value, the controller controls the pressure relief valve 16 to work until the oil pressure value in the pressure accumulator tank 12 is equal to the set oil pressure value. The oil pressure value, so as to ensure that the oil pressure value in the pressure accumulator tank 12 is stable at the set oil pressure value, thereby improving the accuracy of detecting whether the fuel injector 100 is faulty.

Wherein, the fuel injector fault detection device also includes a fuel tank, the hydraulic pump 11 is also communicated with the fuel tank, and the pressure relief valve 16 is also communicated with the fuel tank. It can be understood that the oil tank provides pumped hydraulic oil to the hydraulic pump 11, and when the oil pressure value of the oil in the pressure accumulator tank 12 is greater than the set oil pressure value, the hydraulic oil unloaded through the pressure relief valve 16 returns to the oil tank .

Specifically, the hydraulic pump 11 is an electric pump. The electric pump works with high efficiency. As an alternative, the hydraulic pump 11 can also be a manual pump.

Wherein, the fuel injector fault detection device also includes an alarm, and the alarm is electrically connected with the controller. Specifically, when the detection system detects that the fuel injector 100 is faulty, the alarm will alarm to remind staff that the fuel injector 100 is faulty.

The present invention also provides a fuel injector fault detection method, which is applied to the above-mentioned fuel injector fault detection device, and can quickly, efficiently and accurately detect whether the fuel injector 100 is faulty.

As shown in Figure 2, the fuel injector fault detection method specifically includes the following steps:

S100. Measure whether the resistance of the fuel injector 100 is within a set resistance value range.

If the resistance of the fuel injector 100 is within the range of the set resistance value, S200 is executed.

If the resistance of the fuel injector 100 is not within the range of the set resistance value, it means that the resistance of the fuel injector 100 is abnormal, and the fuel injector 100 is faulty.

Specifically, a multimeter is used to detect whether the resistance value of the electromagnetic coil of the fuel injector 100 is within a set resistance value range. In this way, it can be preliminarily judged whether the fuel injector 100 is malfunctioning.

S200. Control the hydraulic pump 11 to pump oil to the pressure storage tank 12.

S300. Determine whether the oil pressure value of the pressure accumulator tank 12 is greater than or equal to a set oil pressure value.

If the oil pressure value of the pressure accumulator tank 12 is greater than or equal to the set oil pressure value, execute S400.

If the oil pressure value of the pressure accumulator tank 12 is lower than the set oil pressure value, execute S500.

S400 , control the hydraulic pump 11 to stop pumping oil, and judge whether the fuel injector 100 is faulty according to the drop rate of the oil pressure in the pressure accumulator tank 12 .

The specific steps for judging whether the fuel injector 100 is faulty according to the descending speed of the oil pressure of the pressure accumulator 12 are as follows:

S410, energize the fuel injector 100, and control the fuel injector 100 to inject fuel.

S420. Determine whether the descending speed is within a set descending speed range.

If the descending speed is within the set descending speed range, it means that the fuel injector 100 is normal.

If the descending speed is not within the set descending speed range, it indicates that the fuel injector 100 is malfunctioning. At this time, the controller controls the alarm to alarm.

S500. Determine whether the duration of oil pumping by the hydraulic pump 11 is greater than or equal to a set duration.

If the duration of oil pumping by the hydraulic pump 11 is greater than or equal to the set duration, it indicates that the detection system is faulty. It can be understood that if the duration of oil pumping by the hydraulic pump 11 is greater than or equal to the set duration, and the oil pressure value of the pressure accumulator tank 12 is less than the set oil pressure value, it means that the pressure accumulator tank 12, the first pipeline 14 and the If one or more of the second pipelines 15 fails, the detection system needs to be repaired.

Wherein, when the pressure sensor 13 detects that the oil pressure value of the pressure accumulator tank 12 is greater than the set oil pressure value, in order to ensure that the oil pressure value in the pressure accumulator tank 12 is stable at the set oil pressure value, there is an additional step between step S300 and step S400. Include the following steps:

The pressure relief valve 16 works until the oil pressure value in the pressure accumulator tank 12 is equal to the set oil pressure value.

It is set in this way to ensure that the fuel injector 100 is effectively detected by setting the range of the descending speed to improve the detection accuracy of the fuel injector fault detection device.

Therefore, the fuel injector fault detection method is applied to the above-mentioned fuel injector fault detection device, which can quickly, efficiently and accurately detect whether the fuel injector 100 is faulty.

Apparently, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the implementation of the present invention. Various obvious changes, readjustments, and substitutions will occur to those skilled in the art without departing from the scope of the present invention. It is not necessary and impossible to exhaustively list all the implementation manners here. All modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (9)

1. A fuel injector fault detection method, characterized in that the fuel injector fault detection device comprises: A detection system, the detection system includes a hydraulic pump (11), a pressure accumulator (12) and a pressure sensor (13), the hydraulic pump (11) communicates with the pressure accumulator (12), and the pressure accumulator (12) ) communicates with the fuel injector (100), the pressure sensor (13) is arranged in the pressure accumulator tank (12) and is used to monitor the oil pressure of the pressure accumulator tank (12); a controller, the controller is electrically connected to both the pressure sensor (13) and the fuel injector (100), and the controller can control the fuel injector according to the electrical signal of the pressure sensor (13) (100) fuel injection; The fuel injector fault detection method includes: Measuring whether the resistance of the fuel injector (100) is within the range of the set resistance value; If the resistance of the fuel injector (100) is within the range of the set resistance value, the hydraulic pump (11) is controlled to pump oil to the pressure accumulator (12); Judging whether the oil pressure value of the pressure accumulator tank (12) is greater than or equal to the set oil pressure value; If the oil pressure value of the pressure accumulator box (12) is greater than or equal to the set oil pressure value, the hydraulic pump (11) is controlled to stop pumping oil, and according to the drop of the oil pressure of the pressure accumulator box (12), The speed judges whether the fuel injector (100) is faulty. 2. The fuel injector fault detection method according to claim 1, characterized in that, the detection system further comprises a pressure relief valve (16), and the pressure relief valve (16) is connected with the pressure accumulator tank (12) connected. 3. The fuel injector fault detection method according to claim 2, characterized in that, the fuel injector fault detection device further comprises a fuel tank, the hydraulic pump (11) is also communicated with the fuel tank, and the pressure relief valve ( 16) It also communicates with the oil tank. 4. The fuel injector fault detection method according to claim 1, characterized in that the hydraulic pump (11) is an electric pump. 5. The fuel injector fault detection method according to claim 1, wherein the fuel injector fault detection device further comprises an alarm, and the alarm is electrically connected to the controller. 6. The fuel injector fault detection method according to claim 1, characterized in that if the resistance value of the fuel injector (100) is not within the range of the set resistance value, it means that the resistance of the fuel injector (100) is abnormal , The fuel injector (100) is faulty. 7. The fuel injector fault detection method according to claim 1, characterized in that if the oil pressure value of the pressure accumulator tank (12) is less than the set oil pressure value, it is judged that the hydraulic pump (11 ) Whether the duration of pump oil is greater than or equal to the set duration; If the duration of oil pumping by the hydraulic pump (11) is greater than or equal to the set duration, it indicates that the detection system is faulty. 8. The fuel injector fault detection method according to claim 1, characterized in that the specific steps of judging whether the fuel injector (100) is faulty according to the drop rate of the oil pressure of the pressure accumulator (12) include: energize the fuel injector (100), and control the fuel injector (100) to spray oil; judging whether the descending speed is within the set descending speed range; If the descending speed is within the set descending speed range, it means that the fuel injector (100) is normal; If the descending speed is not within the set descending speed range, it indicates that the fuel injector (100) is faulty. 9. The fuel injector fault detection method according to claim 1, characterized in that, the detection system further comprises a pressure relief valve (16), if the oil pressure value of the pressure accumulator (12) is greater than the set If the oil pressure value is fixed, then the pressure relief valve (16) works until the oil pressure value in the pressure accumulator tank (12) is equal to the set oil pressure value.

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