CN117072339A

CN117072339A - Determination method and determination device for failure of shut-off valve and electronic equipment

Info

Publication number: CN117072339A
Application number: CN202311057820.XA
Authority: CN
Inventors: 王志军; 徐永新; 单文超; 刘新月; 孟梅; 张康
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2023-08-21
Filing date: 2023-08-21
Publication date: 2023-11-17

Abstract

The application provides a determination method, a determination device and electronic equipment for a shut-off valve fault. The method comprises the following steps: acquiring the current rotating speed of an engine, acquiring first gas pressure at least when the current rotating speed is larger than or equal to a first preset rotating speed, and determining the opening function fault of the cut-off valve when the first gas pressure is smaller than or equal to the first preset pressure; under the condition that the current rotating speed is larger than the second preset rotating speed and smaller than the first preset rotating speed, acquiring the gas pressure in the cut-off valve once every preset time period to acquire a preset number of second gas pressures; and determining a first maximum gas pressure and a first minimum gas pressure, calculating the absolute value of the difference value between the first maximum gas pressure and the first minimum gas pressure, and determining the shutdown function fault of the shut-off valve under the condition that the absolute value of the difference value is smaller than or equal to a second preset pressure. The application solves the problem that whether the shut-off valve fails or not can not be diagnosed in time.

Description

Determination method and determination device for failure of shut-off valve and electronic equipment

Technical Field

The present application relates to the field of failure diagnosis of an engine shut-off valve, and more particularly, to a shut-off valve failure determination method, determination apparatus, computer-readable storage medium, and electronic device.

Background

Currently, more and more engine products employ woodwald PFAV valves (proportional flow valves, proportional Flow Area Valve, PFAV for short), including PFAV shut-off valves, PFAV temperature and pressure sensors, and PFAV pressure regulating valves. Meanwhile, more and more ECUs (electronic control units Electronic Control Unit, called ECUs for short) adapt to the PFAV valve, but even if the PFAV valve is normally connected in the actual application process, the cause of immature ECU program or the cause of the PFAV valve may exist, so that the PFAV cut-off valve is accidentally disabled. In particular, if the master ECU and the slave ECU control the engine with one PFAV valve, if the PFAV cut-off valve on one side is opened and fails, the engine can still be started normally, and the engine can be damaged and safety problems can occur due to long-time running or loading under the working condition. If the PFAV cut-off valve fails to close, potential safety hazards and economic losses may result.

Therefore, how to diagnose whether the PFAV cut-off valve malfunctions in time is a problem that needs to be solved at present.

Disclosure of Invention

The application aims to provide a determination method, a determination device, a computer readable storage medium and electronic equipment for a shut-off valve fault, which at least solve the problem that the fault of the shut-off valve cannot be diagnosed in time in the prior art.

In order to achieve the above object, according to one aspect of the present application, there is provided a determination method of a cutoff valve failure, the determination method being applied to an ECU that controls opening and closing of the cutoff valve included in a PFAV valve included in an engine, the determination method comprising: acquiring the current rotating speed of an engine, acquiring the gas pressure in a shut-off valve at least under the condition that the current rotating speed is larger than or equal to a first preset rotating speed, obtaining the first gas pressure, and determining the opening function fault of the shut-off valve under the condition that the first gas pressure is smaller than or equal to the first preset pressure, wherein the first preset rotating speed is smaller than the rated rotating speed of the engine; under the condition that the current rotating speed is larger than a second preset rotating speed and smaller than the first preset rotating speed, acquiring the gas pressure in the cut-off valve once every preset time period to acquire a preset number of second gas pressures; and determining the maximum value and the minimum value in the plurality of second gas pressures to obtain a first maximum gas pressure and a first minimum gas pressure, calculating the absolute value of the difference value between the first maximum gas pressure and the first minimum gas pressure, and determining the shutdown function fault of the shut-off valve under the condition that the absolute value of the difference value is smaller than or equal to a second preset pressure, wherein the second preset pressure is smaller than the first preset pressure.

Optionally, the PFAV valve further includes a pressure regulating valve, at least when the current rotation speed is greater than or equal to a first preset rotation speed, to obtain a gas pressure in the shut-off valve, including: acquiring the pre-valve pressure of the shut-off valve, and determining whether the pre-valve pressure is greater than a third preset pressure, wherein the pre-valve pressure is the pressure of a pipeline positioned upstream of the shut-off valve; determining whether the shut-off valve is in an open state, acquiring the opening of the pressure regulating valve under the condition that the shut-off valve is in the open state, and determining whether the opening is larger than a preset opening; and acquiring the gas pressure in the shut-off valve under the condition that the pressure before the valve is larger than the third preset pressure, the shut-off valve is in an open state and the opening of the pressure regulating valve is larger than the preset opening.

Optionally, after determining that the opening function of the shut-off valve fails, the determining method further includes: controlling the rotating speed of the engine to be 0; a first acquisition step of acquiring the gas pressure in the cut-off valve to obtain a third gas pressure; a first determining step of determining an opening malfunction of the shut-off valve in the case where the third gas pressure is less than or equal to the first preset pressure; and sequentially repeating the first obtaining step and the first determining step at least once until the third gas pressure is larger than the first preset pressure, and determining that the opening function of the cut-off valve is normal.

Optionally, acquiring the gas pressure in the shut-off valve once every a preset time period to obtain a preset number of second gas pressures, including: a second determining step of determining the number of the second gas pressures which are currently acquired to obtain the current number; a second obtaining step of obtaining the gas pressure in the shut-off valve at intervals of the preset time period under the condition that the current number is smaller than the preset number; and sequentially repeating the second determining step and the second obtaining step at least once until the current quantity is greater than or equal to the preset quantity, so as to obtain the preset quantity of the second gas pressure.

Optionally, determining a maximum value and a minimum value of the plurality of second gas pressures includes: determining whether the rotation speed of the engine corresponding to the second gas pressure obtained last time is larger than the second preset rotation speed; and determining the maximum value and the minimum value in the plurality of second gas pressures under the condition that the rotation speed of the engine corresponding to the second gas pressure obtained last time is larger than the second preset rotation speed.

Optionally, after determining that the shut-off function of the shut-off valve fails, the determining method further includes: controlling the rotating speed of the engine to be 0; a third obtaining step, namely obtaining the gas pressure in the cut-off valve once every preset time period to obtain the preset number of fourth gas pressures; a calculating step, namely determining the maximum value and the minimum value in the fourth gas pressures to obtain a second maximum gas pressure and a second minimum gas pressure, and calculating the absolute value of the difference value between the second maximum gas pressure and the second minimum gas pressure; a third determining step of determining a shutdown failure of the shut-off valve in the case where an absolute value of a difference between the second maximum gas pressure and the second minimum gas pressure is less than or equal to the second preset pressure; and sequentially repeating the third obtaining step, the calculating step and the third determining step at least once until the absolute value of the difference value between the second maximum gas pressure and the second minimum gas pressure is larger than the second preset pressure, and determining that the shutoff function of the shutoff valve is normal.

Optionally, the determining method further includes: and under the condition that the absolute value of the difference value is larger than the second preset pressure, determining that the shutoff function of the shutoff valve is normal.

According to another aspect of the present application, there is provided a determination device of a cutoff valve failure, the determination device being applied to an ECU that controls opening and closing of the cutoff valve included in a PFAV valve included in an engine, comprising: a first determining unit, configured to obtain a current rotation speed of an engine, obtain a gas pressure in a shut-off valve at least when the current rotation speed is greater than or equal to a first preset rotation speed, obtain the first gas pressure, and determine an opening function failure of the shut-off valve when the first gas pressure is less than or equal to the first preset pressure, where the first preset rotation speed is less than a rated rotation speed of the engine; the acquisition unit is used for acquiring the gas pressure in the cut-off valve once every preset time period to acquire a preset number of second gas pressures under the condition that the current rotating speed is larger than a second preset rotating speed and smaller than the first preset rotating speed; and the second determining unit is used for determining the maximum value and the minimum value in the plurality of second gas pressures to obtain a first maximum gas pressure and a first minimum gas pressure, calculating the absolute value of the difference value between the first maximum gas pressure and the first minimum gas pressure, and determining the shutdown function fault of the shut-off valve under the condition that the absolute value of the difference value is smaller than or equal to a second preset pressure, wherein the second preset pressure is smaller than the first preset pressure.

According to still another aspect of the present application, there is provided a computer-readable storage medium including a stored program, wherein the program, when executed, controls a device in which the computer-readable storage medium is located to execute any one of the determination methods.

According to still another aspect of the present application, there is provided an electronic apparatus including: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs comprising instructions for performing any one of the determining methods.

By applying the technical scheme of the application, the current rotating speed of the engine is obtained, when the current rotating speed of the engine is larger than or equal to a first preset rotating speed, namely the engine is in an open state, the gas pressure in the cut-off valve is obtained to obtain the first gas pressure, and when the first gas pressure is smaller than or equal to the first preset pressure, the condition that enough gas enters the valve is indicated, and the opening function fault of the cut-off valve is determined; under the condition that the current rotating speed is larger than the second preset rotating speed, acquiring the gas pressure once every preset time period, acquiring the preset number of times, obtaining the preset number of second gas pressures, determining the absolute value of the difference value between the maximum value and the minimum value in the second gas pressures, and obtaining the first maximum gas pressure and the first minimum gas pressure. Compared with the prior art, the method and the device can not timely find that the shut-off valve fails, so that the air inflow of the engine is insufficient or excessive, and further the engine fails. Therefore, the problem that whether the shut-off valve fails or not can not be diagnosed in time in the prior art can be solved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

fig. 1 is a block diagram showing a hardware configuration of a mobile terminal for performing a determination method of a shut-off valve failure according to an embodiment of the present application;

FIG. 2 is a schematic flow chart of a method for determining a shut-off valve failure according to an embodiment of the present application;

FIG. 3 is a flowchart of a specific method for determining a failure of a shut-off valve according to an embodiment of the present application;

FIG. 4 is a flowchart of a specific method for determining a shut-off valve failure according to an embodiment of the present application;

FIG. 5 is a flow chart of acquiring a plurality of second gas pressures in a specific method for determining a shut-off valve failure according to an embodiment of the present application;

fig. 6 shows a block diagram of a determination device of a shut-off valve failure according to an embodiment of the present application.

Wherein the above figures include the following reference numerals:

102. a processor; 104. a memory; 106. a transmission device; 108. and an input/output device.

Detailed Description

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.

In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the application herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

For convenience of description, the following will describe some terms or terminology involved in the embodiments of the present application:

PFAV valve: the proportional flow valve Proportional Flow Area Valve is a valve for controlling the gas flow and comprises a PFAV cut-off valve, a PFAV temperature pressure sensor and a PFAV pressure regulating valve.

PFAV shut-off valve: the upstream gas path of the PFAV valve is closed and opened, determining whether upstream gas enters the valve of the PFAV valve.

And (3) ECU: and an electronic control unit.

As described in the background art, in the prior art, whether the PFAV cut-off valve fails cannot be diagnosed in time, and in order to solve the problem that whether the PFAV cut-off valve fails cannot be diagnosed in time, embodiments of the present application provide a method for determining a failure of the cut-off valve, a determining device, a computer readable storage medium, and an electronic apparatus.

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application.

The method embodiments provided in the embodiments of the present application may be performed in a mobile terminal, a computer terminal or similar computing device. Taking the operation on the mobile terminal as an example, fig. 1 is a block diagram of a hardware structure of the mobile terminal according to a method for determining a failure of a shut-off valve according to an embodiment of the present application. As shown in fig. 1, a mobile terminal may include one or more (only one is shown in fig. 1) processors 102 (the processor 102 may include, but is not limited to, a microprocessor MCU or a processing device such as a programmable logic device FPGA) and a memory 104 for storing data, wherein the mobile terminal may also include a transmission device 106 for communication functions and an input-output device 108. It will be appreciated by those skilled in the art that the structure shown in fig. 1 is merely illustrative and not limiting of the structure of the mobile terminal described above. For example, the mobile terminal may also include more or fewer components than shown in fig. 1, or have a different configuration than shown in fig. 1.

The memory 104 may be used to store a computer program, for example, a software program of application software and a module, such as a computer program corresponding to a method for determining a failure of a shut-off valve in an embodiment of the present invention, and the processor 102 executes the computer program stored in the memory 104 to perform various functional applications and data processing, that is, to implement the above-described method. Memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include memory remotely located relative to the processor 102, which may be connected to the mobile terminal via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof. The transmission device 106 is used to receive or transmit data via a network. Specific examples of the network described above may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, simply referred to as NIC) that can connect to other network devices through a base station to communicate with the internet. In one example, the transmission device 106 may be a Radio Frequency (RF) module, which is configured to communicate with the internet wirelessly.

In the present embodiment, a method of determining a failure of a shut-off valve operating on a mobile terminal, a computer terminal, or a similar computing device is provided, and it is to be noted that the steps illustrated in the flowchart of the drawings may be performed in a computer system such as a set of computer-executable instructions, and that although a logical order is illustrated in the flowchart, in some cases the steps illustrated or described may be performed in an order other than that illustrated herein.

Fig. 2 is a flowchart of a method of determining a shut-off valve failure according to an embodiment of the present application. The above-described determination method is applied to an ECU that controls opening and closing of the above-described shut-off valve included in a PFAV valve included in the above-described engine, as shown in fig. 2, and includes the steps of:

step S201, obtaining the current rotation speed of an engine, obtaining the gas pressure in a cut-off valve at least under the condition that the current rotation speed is larger than or equal to a first preset rotation speed, obtaining the first gas pressure, and determining the opening function fault of the cut-off valve under the condition that the first gas pressure is smaller than or equal to the first preset pressure, wherein the first preset rotation speed is smaller than the rated rotation speed of the engine;

Specifically, in the case that the engine starts to operate, whether the function of the shut-off valve is abnormal or not is determined, so that the current rotation speed of the engine is firstly obtained, and the first preset rotation speed can be the dragging rotation speed of the starter or any rotation speed value smaller than the rated rotation speed of the engine. And under the condition that the current rotating speed is greater than or equal to the first preset rotating speed, indicating that the engine is in a starting state, and acquiring the gas pressure in the PFAV valve at the moment to obtain the first gas pressure. Because the PFAV cut-off valve is opened, the gas channel is smooth, the gas can enter the PFAV valve, and when the PFAV cut-off valve is closed, the gas channel is closed, and the gas cannot enter the PFAV valve. The PFAV valve is characterized by a valve internal pressure that is about 0.8bar to about 1.1bar greater than the PFAV valve downstream pressure. Therefore, if the PFAV valve can be normally opened, the pressure in the valve should be relatively high, and by adopting this characteristic, it can be determined whether the opening function of the shut-off valve is normal, the first preset pressure may be 1.5bar, and if the first gas pressure is less than or equal to the first preset pressure, that is, 1.5bar, it can be determined that the opening function of the shut-off valve is failed, resulting in insufficient pressure in the valve.

Step S202, acquiring the gas pressure in the cut-off valve once every preset time period to obtain a preset number of second gas pressures under the condition that the current rotating speed is larger than a second preset rotating speed and smaller than the first preset rotating speed;

specifically, in addition to determining whether the opening function of the shut-off valve has failed, it is necessary to determine whether the shutting-off function of the shut-off valve has failed. When the engine starts to rotate and the rotating speed is smaller than the first preset rotating speed, namely the current rotating speed is larger than the second preset rotating speed and smaller than the first preset rotating speed, the second preset rotating speed can be 50r/min, the opening change time of the existing data calibration PFAV valve is slightly earlier than the opening time of the PFAV valve cut-off valve, the pressure in the PFAV valve can be reduced in a short time, if the cut-off state of the PFAV valve is relatively poor, the pressure reduction state of the PFAV valve at the moment can be weakened, and the fact that the PFAV cut-off valve cannot be normally cut-off is recognized through the characteristic. Therefore, the gas pressure in the shut-off valve is acquired once every preset time period, which may be 0.15 seconds, and the preset number may be 5.

Step S203, determining a maximum value and a minimum value of the plurality of second gas pressures, to obtain a first maximum gas pressure and a first minimum gas pressure, calculating an absolute value of a difference between the first maximum gas pressure and the first minimum gas pressure, and determining a failure of a shut-off function of the shut-off valve when the absolute value of the difference is less than or equal to a second preset pressure, wherein the second preset pressure is less than the first preset pressure.

Specifically, after the predetermined number of second gas pressures are acquired, the maximum value and the minimum value are determined, the first maximum gas pressure and the first minimum gas pressure are obtained, whether the pressure difference is large or not is determined by the absolute value of the difference between the maximum value and the minimum value, that is, whether the valve internal pressure decreases in a short time, and the second preset pressure may be 200hpa, that is, in the case where the absolute value of the difference is less than or equal to the second preset pressure, it is indicated that the valve internal pressure does not sufficiently decrease in a short time, and it may be determined that the shut-off function of the shut-off valve fails.

Through the embodiment, the current rotation speed of the engine is obtained, when the current rotation speed of the engine is greater than or equal to a first preset rotation speed, namely the engine is in an open state, the gas pressure in the cut-off valve is obtained to obtain the first gas pressure, and when the first gas pressure is smaller than or equal to the first preset pressure, the condition that enough gas enters the valve is indicated, and the opening function fault of the cut-off valve is determined; under the condition that the current rotating speed is larger than the second preset rotating speed, acquiring the gas pressure once every preset time period, acquiring the preset number of times, obtaining the preset number of second gas pressures, determining the absolute value of the difference value between the maximum value and the minimum value in the second gas pressures, and obtaining the first maximum gas pressure and the first minimum gas pressure. Compared with the prior art, the method and the device can not timely find that the shut-off valve fails, so that the air inflow of the engine is insufficient or excessive, and further the engine fails. Therefore, the problem that whether the shut-off valve fails or not can not be diagnosed in time in the prior art can be solved.

In a specific implementation process, the PFAV valve further includes a pressure regulating valve, and the step S201 may be implemented by the following steps: acquiring the valve front pressure of the shut-off valve, and determining whether the valve front pressure is greater than a third preset pressure, wherein the valve front pressure is the pressure of a pipeline positioned upstream of the shut-off valve; determining whether the shut-off valve is in an open state, acquiring the opening of the pressure regulating valve when the shut-off valve is in the open state, and determining whether the opening is larger than a preset opening; and acquiring the gas pressure in the shut-off valve when the pre-valve pressure is greater than the third preset pressure, the shut-off valve is in an open state, and the opening of the pressure regulating valve is greater than the preset opening. According to the method, the gas pressure in the cut-off valve is obtained under the condition that the conditions are met, so that the gas pressure can be obtained under the condition that certain working conditions are met, whether the cut-off valve fails or not is determined according to the gas pressure under the working conditions, and the failure can be diagnosed more accurately.

Specifically, it is required to determine whether the shut-off valve fails under the condition that the engine meets a certain working condition, so that the accuracy of the determination result can be ensured, the pressure before the shut-off valve is the pressure of the pipeline before the PFAV valve, and the third preset pressure can be a standard pressure, for example: 1.5bar, the preset opening is a scalable opening, for example: 40%. And under the conditions that the rotating speed of the engine is greater than a first preset rotating speed, namely the dragging rotating speed of the starter, the pressure before the valve is greater than a third preset pressure, the cut-off valve is in an open state, and the opening of the pressure regulating valve is greater than 40% of the preset opening, acquiring the gas pressure in the cut-off valve, and further judging whether a fault occurs.

In order to further determine whether the opening function of the shut-off valve is restored to normal, the above-described determination method further includes the steps of, after the above-described step S201: controlling the rotation speed of the engine to be 0; a first acquisition step of acquiring the gas pressure in the shut-off valve to obtain a third gas pressure; a first determining step of determining an opening malfunction of the shutoff valve in the case where the third gas pressure is less than or equal to the first preset pressure; and repeating the first obtaining step and the first determining step at least once in sequence until the third gas pressure is larger than the first preset pressure, and determining that the opening function of the cut-off valve is normal. The method sequentially repeats the steps after determining the fault of the opening function, so that whether the opening function of the cut-off valve is recovered to be normal or not can be determined in time.

In the specific implementation process, after determining that the opening function of the shut-off valve fails, the ECU controls the rotation speed of the engine to 0, that is, performs rotation speed limitation or flameout protection on the engine. And then acquiring the gas pressure in the cut-off valve again to obtain a third gas pressure, and under the condition that the third gas pressure is smaller than or equal to the first preset pressure of 1.5bar, still determining the opening function fault of the cut-off valve, and then acquiring the gas pressure again until the third gas pressure is larger than the first preset pressure, wherein the condition indicates that the opening function of the cut-off valve is restored to be normal, and at the moment, the ECU can control the engine to start again.

In some alternative embodiments, step S202 may be implemented by: a second determining step of determining the number of the second gas pressures which are currently acquired to obtain the current number; a second obtaining step of obtaining the gas pressure in the shut-off valve at intervals of the preset time period when the current number is smaller than the preset number; and repeating the second determining step and the second obtaining step at least once in sequence until the current quantity is greater than or equal to the preset quantity, so as to obtain a preset quantity of the second gas pressure. The method acquires the preset number of second gas pressures, so that whether the difference value between the maximum value and the minimum value of the gas meets the pressure difference condition or not can be accurately determined, and whether the fault occurs or not can be determined.

Specifically, under the condition that the rotating speed of the engine is determined to be larger than a second preset rotating speed and smaller than the first preset rotating speed, the gas pressure in the cut-off valve is obtained, whether the number of the obtained second gas pressures, namely the current number, is smaller than the preset number is judged, under the condition that the number is smaller than the preset number, the gas pressure is continuously obtained after a preset time period is separated until the current number is larger than or equal to the preset number, the cycle is jumped out, and the preset number of second gas pressures is obtained.

In order to ensure that the acquired second gas pressures all meet the working conditions, the step S203 may be implemented by the following steps: determining whether the rotation speed of the engine corresponding to the second gas pressure obtained last time is greater than the second preset rotation speed; and determining the maximum value and the minimum value in the plurality of second gas pressures under the condition that the rotation speed of the engine corresponding to the second gas pressure obtained last time is larger than the second preset rotation speed. According to the method, under the condition that the second gas pressure is obtained in the last time, whether the corresponding engine rotating speed is larger than the second preset rotating speed or not is determined, so that the problem that the engine starting process is interrupted and the obtained second gas pressure is inaccurate under the condition of interruption can be prevented.

In the specific implementation process, the collected second gas pressures are all collected in the starting process of the engine, so that the collected second gas pressures are all the starting process by judging whether the rotating speed corresponding to the last collected second gas pressure is larger than the second preset rotating speed, if the last collected second preset rotating speed is larger than or equal to the second preset rotating speed, the whole collecting process is the starting process, the engine is started without interruption, and if the last collected second preset rotating speed is smaller than the second preset rotating speed, the engine is possibly interrupted in the starting process, and the collected second gas pressures are inaccurate and need to be collected again.

After the step S203, the determining method further includes the steps of: controlling the rotation speed of the engine to be 0; a third obtaining step of obtaining the gas pressure in the shut-off valve once every the preset time period to obtain the preset number of fourth gas pressures; a calculating step of determining a maximum value and a minimum value of the fourth gas pressures to obtain a second maximum gas pressure and a second minimum gas pressure, and calculating an absolute value of a difference between the second maximum gas pressure and the second minimum gas pressure; a third determining step of determining that the shutoff function of the shutoff valve has failed when the absolute value of the difference between the second maximum gas pressure and the second minimum gas pressure is less than or equal to the second preset pressure; and repeating the third obtaining step, the calculating step and the third determining step at least once in sequence until the absolute value of the difference value between the second maximum gas pressure and the second minimum gas pressure is larger than the second preset pressure, and determining that the shutoff function of the shutoff valve is normal. According to the method, after the shut-off function failure of the shut-off valve is determined, the gas pressure in the shut-off valve is repeatedly obtained until the absolute value of the difference value between the maximum gas pressure and the minimum gas pressure is larger than the second preset pressure, and the shut-off function of the shut-off valve is determined to be normal, so that whether the shut-off function of the shut-off valve is recovered to be normal can be timely determined.

Specifically, after determining the shutdown failure of the shutdown valve, controlling the rotation speed of the engine to be 0, namely limiting the rotation speed of the engine, then obtaining the gas pressure every preset time period to obtain a preset number of fourth gas pressures, calculating the absolute value of the difference value between the maximum value and the minimum value, determining the shutdown failure under the condition that the absolute value of the difference value is smaller than or equal to the second preset pressure, repeating the steps until the absolute value of the difference value is larger than the second preset pressure, and determining that the shutdown function of the shutdown valve is recovered to be normal.

In order to accurately determine whether the shut-off function of the shut-off valve is normal, the above determination method further includes the steps of: and under the condition that the absolute value of the difference value is larger than the second preset pressure, determining that the shutoff function of the shutoff valve is normal. The method determines that the shut-off function of the shut-off valve is normal under the condition that the absolute value of the difference value is larger than the second preset pressure, so that the shut-off function of the shut-off valve can be accurately determined to be normal.

In the specific implementation process, in the case that the absolute value of the difference between the first maximum gas pressure and the first minimum gas pressure is smaller than or equal to the second preset pressure, the shut-off function failure of the shut-off valve is determined, so that in the case that the absolute value of the difference between the first maximum gas pressure and the first minimum gas pressure is larger than the second preset pressure, the shut-off function of the shut-off valve is determined to be normal.

In order to enable those skilled in the art to more clearly understand the technical solution of the present application, the implementation process of the method for determining a failure of a shut-off valve of the present application will be described in detail with reference to specific embodiments.

The embodiment relates to a specific method for determining a fault of a shut-off valve, which comprises the following steps:

step S1: FIG. 3 is a flowchart of a specific method for determining whether an opening function is faulty in a method for determining a fault of a shut-off valve, where when an engine speed (current speed) is greater than or equal to a starter dragging speed (first preset speed), a pipeline pressure before a PFAV valve (pre-valve pressure) is greater than or equal to a nominal pressure 1.5bar (third preset pressure), the shut-off valve is opened, and an actual opening of the PFAV pressure regulating valve (opening of the pressure regulating valve) is greater than or equal to a nominal opening 40% (preset opening), a pressure in the PFAV valve (gas pressure in the shut-off valve) is obtained to obtain a first gas pressure;

step S2: determining whether the pressure in the PFAV valve (the gas pressure in the shut-off valve) is greater than the calibratable pressure of 1.5 bar+/-0.2 bar (the first preset pressure), and determining that the failure (the failure to open the shut-off valve) cannot be normally opened in the PFAV valve (the failure to open the shut-off valve) under the condition that the pressure in the PFAV valve (the gas pressure in the shut-off valve) is less than or equal to the calibratable pressure (the first preset pressure), wherein a signal 'DSM_FAULT_PERCENT_100' indicating the failure is conducted, and a stResult signal terminal of the DSM_DebTUD transmitted to the ECU informs the ECU of the failure to open the shut-off valve;

Step S3: when the pressure in the PFAV valve (the gas pressure in the shut-off valve) is larger than the calibratable pressure (the first preset pressure), the PFAV valve is determined to be normally opened, a signal 'DSM_FAULT_PERCENT_00' representing the normal is conducted, and a stResult signal terminal of DSM_DebTUD transmitted to the ECU informs the ECU that the opening function of the shut-off valve is normal;

step S4: FIG. 4 is a flowchart of a specific method for determining whether a shut-off function is faulty in a shut-off valve fault determination method, where N is obtained for each storage interval (a preset number is obtained every preset time period) (e.g. 0.15 seconds, 5 statistics) when the engine speed is greater than a calibration speed (e.g. 50 revolutions) (a second preset speed), and a plurality of second gas pressures are obtained to generate a PFAV valve pressure array [ i ];

step S5: after the PFAV valve pressure is obtained for the fifth time, determining the data valid state by determining whether the engine rotating speed is greater than the calibrated rotating speed (for example 50 revolutions) (a second preset rotating speed), taking the maximum value and the minimum value for 5 groups of data after determining that the 5 th data valid state is 1, subtracting the minimum value of the PFAV valve from the maximum value of the PFAV valve to obtain a difference value (absolute value of the difference value), wherein the absolute value of the difference value is smaller than or equal to the PFAV valve pressure drop calibrated value (for example 200 hpa), determining that the PFAV cut-off valve cannot normally turn off, conducting a signal ' DSM_FAULT_PERCENT_100 ' representing the FAULT, and transmitting the signal ' DSM_DebTUD stResult signal end of the DSM_DebTUD to the ECU informs the ECU of the turn-off function FAULT of the cut-off valve;

Step S6: the absolute value of the difference is greater than the PFAV valve pressure drop calibration (e.g., 200 hpa), and it is determined that the PFAV shut-off valve can be normally shut off, and a signal "DSM_FAULT_PERCENT_00" indicating normal is on, and the stResult signal terminal of DSM_DebTUD transmitted to the ECU informs the ECU that the shut-off function of the shut-off valve is normal.

Fig. 5 is a flowchart of acquiring a plurality of second gas pressures in a specific method for determining a shut-off valve failure, including the steps of:

step S10: starting;

step S11: identifying that the engine speed is greater than 50 revolutions (second preset speed), if yes, executing step S12, and if no, executing step S22;

step S12: acquiring a rising edge: i= 1;

step S13: delay 0.15 seconds (preset time period);

step S14: current PFAV valve pressure assignment array [ i ], i= i+1;

step S15: judging whether i is less than or equal to 5 (preset quantity), if yes, executing step S13, and if no, executing step S16;

step S16: if the current engine speed is greater than 50 revolutions, executing step S17 if yes, and executing step S22 if no;

step S17: comparing the maximum value and the minimum value of the 5 groups of numbers;

step S18: maximum-minimum;

Step S19: judging whether the difference is less than 200hpa, if yes, executing step S22, and if no, curing the fault;

step S20: a fault is reported;

step S21: cure the fault;

step S22: and (5) ending.

The embodiment of the application also provides a device for determining the failure of the shut-off valve, and the device for determining the failure of the shut-off valve can be used for executing the method for determining the failure of the shut-off valve. The device is used for realizing the above embodiments and preferred embodiments, and is not described in detail. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. While the means described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.

The following describes a device for determining a failure of a shut-off valve according to an embodiment of the present application.

Fig. 6 is a schematic view of a determination device of a shut-off valve failure according to an embodiment of the present application. The determining device is applied to an ECU that controls opening and closing of the shut-off valve included in a PFAV valve included in the engine, as shown in fig. 6, and includes:

A first determining unit 10, configured to obtain a current rotation speed of an engine, obtain a gas pressure in a shut-off valve at least when the current rotation speed is greater than or equal to a first preset rotation speed, and obtain a first gas pressure, and determine an opening malfunction of the shut-off valve when the first gas pressure is less than or equal to the first preset pressure, where the first preset rotation speed is less than a rated rotation speed of the engine;

An obtaining unit 20, configured to obtain a preset number of second gas pressures by obtaining the gas pressure in the shut-off valve once every preset time period when the current rotation speed is greater than a second preset rotation speed and less than the first preset rotation speed;

And a second determining unit 30 configured to determine a maximum value and a minimum value of the plurality of second gas pressures, to obtain a first maximum gas pressure and a first minimum gas pressure, calculate an absolute value of a difference between the first maximum gas pressure and the first minimum gas pressure, and determine a failure of a shut-off function of the shut-off valve when the absolute value of the difference is less than or equal to a second preset pressure, where the second preset pressure is less than the first preset pressure.

In a specific implementation process, the PFAV valve further comprises a pressure regulating valve, the first determining unit comprises a first determining module, a second determining module and an obtaining module, wherein the first determining module is used for obtaining the pre-valve pressure of the shut-off valve and determining whether the pre-valve pressure is greater than a third preset pressure, and the pre-valve pressure is the pressure of a pipeline positioned at the upstream of the shut-off valve; the second determining module is used for determining whether the shut-off valve is in an open state, acquiring the opening of the pressure regulating valve under the condition that the shut-off valve is in the open state, and determining whether the opening is larger than a preset opening; the acquisition module is used for acquiring the gas pressure in the shut-off valve under the condition that the pressure before the valve is larger than the third preset pressure, the shut-off valve is in an open state and the opening of the pressure regulating valve is larger than the preset opening. The device acquires the gas pressure in the shut-off valve under the condition that the conditions are met, so that the gas pressure can be acquired when a certain working condition is met, and whether the shut-off valve fails or not is determined according to the gas pressure under the working condition, thereby diagnosing the failure more accurately.

In order to further determine whether the opening function of the shut-off valve is recovered, the determining device further comprises a first control module, a first acquisition module, a first determining module and a second determining module, wherein the first control module is used for controlling the rotating speed of the engine to be 0; the first acquisition module is used for executing a first acquisition step to acquire the gas pressure in the cut-off valve to obtain a third gas pressure; the first determining module is used for executing a first determining step and determining the opening function failure of the cut-off valve under the condition that the third gas pressure is smaller than or equal to the first preset pressure; the second determining module is configured to sequentially repeat the first obtaining step and the first determining step at least once until the third gas pressure is greater than the first preset pressure, and determine that the opening function of the shut-off valve is normal. The device sequentially repeats the steps after determining the failure of the opening function, so that whether the opening function of the cut-off valve is recovered to be normal or not can be timely determined.

In some optional embodiments, the obtaining unit includes a third determining module, a second obtaining module, and a repeating module, where the third determining module is configured to perform the second determining step, determine the number of the second gas pressures that have been obtained currently, and obtain the current number; the second acquisition module is used for executing a second acquisition step, and acquiring the gas pressure in the cut-off valve at intervals of the preset time period under the condition that the current number is smaller than the preset number; the repeating module is configured to sequentially repeat the second determining step and the second obtaining step at least once until the current number is greater than or equal to the preset number, and obtain a preset number of second gas pressures. The device acquires a preset number of second gas pressures, so that whether the difference value between the maximum value and the minimum value of the gas meets the pressure difference condition or not can be accurately determined, and whether a fault occurs or not can be determined.

In order to ensure that the acquired second gas pressure meets working conditions, the second determining unit comprises a fourth determining module and a fifth determining module, wherein the fourth determining module is used for determining whether the rotating speed of the engine corresponding to the second gas pressure acquired last time is larger than the second preset rotating speed; and the fifth determining module is used for determining the maximum value and the minimum value in the plurality of second gas pressures when the rotation speed of the engine corresponding to the second gas pressure obtained last time is larger than the second preset rotation speed. The device determines whether the corresponding engine speed is larger than the second preset speed under the condition that the second gas pressure is obtained last time, so that the problem that the second gas pressure obtained under the condition of interruption is inaccurate when the starting process of the engine is interrupted can be prevented.

The determining device further comprises a second control module, a third obtaining module, a calculating module, a sixth determining module and a seventh determining module, wherein the second control module is used for controlling the rotating speed of the engine to be 0; the third acquisition module is used for executing a third acquisition step, and acquiring the gas pressure in the cut-off valve once every the preset time period to obtain the preset number of fourth gas pressures; the calculating module is used for executing the calculating step, determining the maximum value and the minimum value in the fourth gas pressures to obtain a second maximum gas pressure and a second minimum gas pressure, and calculating the absolute value of the difference value between the second maximum gas pressure and the second minimum gas pressure; the sixth determining module is configured to perform a third determining step, and determine that the shut-off function of the shut-off valve fails when an absolute value of a difference between the second maximum gas pressure and the second minimum gas pressure is less than or equal to the second preset pressure; and a seventh determining module, configured to sequentially repeat the third obtaining step, the calculating step, and the third determining step at least once until an absolute value of a difference between the second maximum gas pressure and the second minimum gas pressure is greater than the second preset pressure, and determine that the shut-off function of the shut-off valve is normal. After determining that the shut-off function of the shut-off valve fails, the device repeatedly acquires the gas pressure in the shut-off valve until the absolute value of the difference value between the maximum gas pressure and the minimum gas pressure is larger than the second preset pressure, and determines that the shut-off function of the shut-off valve is normal, so that whether the shut-off function of the shut-off valve is recovered to be normal can be timely determined.

In order to accurately determine whether the shut-off function of the shut-off valve is normal, the determining device further includes an eighth determining module for determining that the shut-off function of the shut-off valve is normal in case that the absolute value of the difference is greater than the second preset pressure. The device determines that the shut-off function of the shut-off valve is normal under the condition that the absolute value of the difference value is larger than the second preset pressure, so that the shut-off function of the shut-off valve can be accurately determined to be normal.

The determination device for the failure of the shut-off valve comprises a processor and a memory, wherein the first determination unit, the acquisition unit, the second determination unit and the like are stored in the memory as program units, and the processor executes the program units stored in the memory to realize corresponding functions. The modules are all located in the same processor; alternatively, the above modules may be located in different processors in any combination.

The processor includes a kernel, and the kernel fetches the corresponding program unit from the memory. The inner core can be provided with one or more than one, and whether the shut-off valve fails or not can be timely diagnosed by adjusting the parameters of the inner core.

The memory may include volatile memory, random Access Memory (RAM), and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM), among other forms in computer readable media, the memory including at least one memory chip.

The embodiment of the invention provides a computer readable storage medium, which comprises a stored program, wherein the program is controlled to control equipment where the computer readable storage medium is located to execute the method for determining the fault of a shut-off valve.

Specifically, the method for determining the failure of the shut-off valve includes:

Optionally, the PFAV valve further includes a pressure regulating valve, at least when the current rotation speed is greater than or equal to a first preset rotation speed, acquiring the gas pressure in the shut-off valve includes: acquiring the valve front pressure of the shut-off valve, and determining whether the valve front pressure is greater than a third preset pressure, wherein the valve front pressure is the pressure of a pipeline positioned upstream of the shut-off valve; determining whether the shut-off valve is in an open state, acquiring the opening of the pressure regulating valve when the shut-off valve is in the open state, and determining whether the opening is larger than a preset opening; and acquiring the gas pressure in the shut-off valve when the pre-valve pressure is greater than the third preset pressure, the shut-off valve is in an open state, and the opening of the pressure regulating valve is greater than the preset opening.

Optionally, after determining that the opening function of the shut-off valve fails, the determining method further includes: controlling the rotation speed of the engine to be 0; a first acquisition step of acquiring the gas pressure in the shut-off valve to obtain a third gas pressure; a first determining step of determining an opening malfunction of the shutoff valve in the case where the third gas pressure is less than or equal to the first preset pressure; and repeating the first obtaining step and the first determining step at least once in sequence until the third gas pressure is larger than the first preset pressure, and determining that the opening function of the cut-off valve is normal.

Optionally, the obtaining the gas pressure in the shut-off valve at intervals of a preset time period to obtain a preset number of second gas pressures includes: a second determining step of determining the number of the second gas pressures which are currently acquired to obtain the current number; a second obtaining step of obtaining the gas pressure in the shut-off valve at intervals of the preset time period when the current number is smaller than the preset number; and repeating the second determining step and the second obtaining step at least once in sequence until the current quantity is greater than or equal to the preset quantity, so as to obtain a preset quantity of the second gas pressure.

Optionally, determining a maximum value and a minimum value of the plurality of second gas pressures includes: determining whether the rotation speed of the engine corresponding to the second gas pressure obtained last time is greater than the second preset rotation speed; and determining the maximum value and the minimum value in the plurality of second gas pressures under the condition that the rotation speed of the engine corresponding to the second gas pressure obtained last time is larger than the second preset rotation speed.

Optionally, after determining that the shut-off function of the shut-off valve fails, the determining method further includes: controlling the rotation speed of the engine to be 0; a third obtaining step of obtaining the gas pressure in the shut-off valve once every the preset time period to obtain the preset number of fourth gas pressures; a calculating step of determining a maximum value and a minimum value of the fourth gas pressures to obtain a second maximum gas pressure and a second minimum gas pressure, and calculating an absolute value of a difference between the second maximum gas pressure and the second minimum gas pressure; a third determining step of determining that the shutoff function of the shutoff valve has failed when the absolute value of the difference between the second maximum gas pressure and the second minimum gas pressure is less than or equal to the second preset pressure; and repeating the third obtaining step, the calculating step and the third determining step at least once in sequence until the absolute value of the difference value between the second maximum gas pressure and the second minimum gas pressure is larger than the second preset pressure, and determining that the shutoff function of the shutoff valve is normal.

The embodiment of the invention provides equipment, which comprises a processor, a memory and a program stored in the memory and capable of running on the processor, wherein the processor realizes at least the following steps when executing the program:

The device herein may be a server, PC, PAD, cell phone, etc.

It will be appreciated by those skilled in the art that the modules or steps of the application described above may be implemented in a general purpose computing device, they may be concentrated on a single computing device, or distributed across a network of computing devices, they may be implemented in program code executable by computing devices, so that they may be stored in a storage device for execution by computing devices, and in some cases, the steps shown or described may be performed in a different order than that shown or described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple modules or steps of them may be fabricated into a single integrated circuit module. Thus, the present application is not limited to any specific combination of hardware and software.

It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.

The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, etc., such as Read Only Memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.

Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises an element.

From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

1) In the method for determining the fault of the cut-off valve, the current rotating speed of the engine is obtained, when the current rotating speed of the engine is larger than or equal to a first preset rotating speed, namely the engine is in an open state, the gas pressure in the cut-off valve is obtained to obtain the first gas pressure, and when the first gas pressure is smaller than or equal to the first preset pressure, the condition that enough gas enters the valve is indicated, and the opening function fault of the cut-off valve is determined; under the condition that the current rotating speed is larger than the second preset rotating speed, acquiring the gas pressure once every preset time period, acquiring the preset number of times, obtaining the preset number of second gas pressures, determining the absolute value of the difference value between the maximum value and the minimum value in the second gas pressures, and obtaining the first maximum gas pressure and the first minimum gas pressure. Compared with the prior art, the method and the device can not timely find that the shut-off valve fails, so that the air inflow of the engine is insufficient or excessive, and further the engine fails. Therefore, the problem that whether the shut-off valve fails or not can not be diagnosed in time in the prior art can be solved.

2) In the determining device for the failure of the cut-off valve, the current rotating speed of the engine is obtained, when the current rotating speed of the engine is larger than or equal to the first preset rotating speed, namely the engine is in an open state, the gas pressure in the cut-off valve is obtained to obtain the first gas pressure, and when the first gas pressure is smaller than or equal to the first preset pressure, the condition that enough gas enters the valve is indicated, and the opening function failure of the cut-off valve is determined; under the condition that the current rotating speed is larger than the second preset rotating speed, acquiring the gas pressure once every preset time period, acquiring the preset number of times, obtaining the preset number of second gas pressures, determining the absolute value of the difference value between the maximum value and the minimum value in the second gas pressures, and obtaining the first maximum gas pressure and the first minimum gas pressure. Compared with the prior art, the method and the device can not timely find that the shut-off valve fails, so that the air inflow of the engine is insufficient or excessive, and further the engine fails. Therefore, the problem that whether the shut-off valve fails or not can not be diagnosed in time in the prior art can be solved.

The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A determination method of a shut-off valve failure, the determination method being applied to an ECU that controls opening and closing of the shut-off valve included in a PFAV valve included in an engine, the determination method comprising:

acquiring the current rotating speed of an engine, acquiring the gas pressure in a shut-off valve at least under the condition that the current rotating speed is larger than or equal to a first preset rotating speed, obtaining the first gas pressure, and determining the opening function fault of the shut-off valve under the condition that the first gas pressure is smaller than or equal to the first preset pressure, wherein the first preset rotating speed is smaller than the rated rotating speed of the engine;

under the condition that the current rotating speed is larger than a second preset rotating speed and smaller than the first preset rotating speed, acquiring the gas pressure in the cut-off valve once every preset time period to acquire a preset number of second gas pressures;

And determining the maximum value and the minimum value in the plurality of second gas pressures to obtain a first maximum gas pressure and a first minimum gas pressure, calculating the absolute value of the difference value between the first maximum gas pressure and the first minimum gas pressure, and determining the shutdown function fault of the shut-off valve under the condition that the absolute value of the difference value is smaller than or equal to a second preset pressure, wherein the second preset pressure is smaller than the first preset pressure.

2. The method according to claim 1, wherein the PFAV valve further includes a pressure regulating valve, and acquiring the gas pressure in the shut-off valve at least in the case where the current rotation speed is greater than or equal to a first preset rotation speed includes:

acquiring the pre-valve pressure of the shut-off valve, and determining whether the pre-valve pressure is greater than a third preset pressure, wherein the pre-valve pressure is the pressure of a pipeline positioned upstream of the shut-off valve;

determining whether the shut-off valve is in an open state, acquiring the opening of the pressure regulating valve under the condition that the shut-off valve is in the open state, and determining whether the opening is larger than a preset opening;

and acquiring the gas pressure in the shut-off valve under the condition that the pressure before the valve is larger than the third preset pressure, the shut-off valve is in an open state and the opening of the pressure regulating valve is larger than the preset opening.

3. The determination method according to claim 1, characterized in that after determining that the opening function of the shut-off valve has failed, the determination method further comprises:

controlling the rotating speed of the engine to be 0;

a first acquisition step of acquiring the gas pressure in the cut-off valve to obtain a third gas pressure;

a first determining step of determining an opening malfunction of the shut-off valve in the case where the third gas pressure is less than or equal to the first preset pressure;

and sequentially repeating the first obtaining step and the first determining step at least once until the third gas pressure is larger than the first preset pressure, and determining that the opening function of the cut-off valve is normal.

4. The method according to claim 1, wherein obtaining the gas pressure in the shut-off valve once every a predetermined period of time to obtain a predetermined number of second gas pressures includes:

a second determining step of determining the number of the second gas pressures which are currently acquired to obtain the current number;

a second obtaining step of obtaining the gas pressure in the shut-off valve at intervals of the preset time period under the condition that the current number is smaller than the preset number;

And sequentially repeating the second determining step and the second obtaining step at least once until the current quantity is greater than or equal to the preset quantity, so as to obtain the preset quantity of the second gas pressure.

5. The method of determining according to claim 1, wherein determining a maximum value and a minimum value among the plurality of second gas pressures includes:

determining whether the rotation speed of the engine corresponding to the second gas pressure obtained last time is larger than the second preset rotation speed;

and determining the maximum value and the minimum value in the plurality of second gas pressures under the condition that the rotation speed of the engine corresponding to the second gas pressure obtained last time is larger than the second preset rotation speed.

6. The determination method according to claim 1, characterized in that, after determining that the shut-off function of the shut-off valve has failed, the determination method further comprises:

controlling the rotating speed of the engine to be 0;

a third obtaining step, namely obtaining the gas pressure in the cut-off valve once every preset time period to obtain the preset number of fourth gas pressures;

a calculating step, namely determining the maximum value and the minimum value in the fourth gas pressures to obtain a second maximum gas pressure and a second minimum gas pressure, and calculating the absolute value of the difference value between the second maximum gas pressure and the second minimum gas pressure;

A third determining step of determining a shutdown failure of the shut-off valve in the case where an absolute value of a difference between the second maximum gas pressure and the second minimum gas pressure is less than or equal to the second preset pressure;

and sequentially repeating the third obtaining step, the calculating step and the third determining step at least once until the absolute value of the difference value between the second maximum gas pressure and the second minimum gas pressure is larger than the second preset pressure, and determining that the shutoff function of the shutoff valve is normal.

7. The determination method according to claim 1, characterized in that the determination method further comprises:

and under the condition that the absolute value of the difference value is larger than the second preset pressure, determining that the shutoff function of the shutoff valve is normal.

8. A determination device of a cutoff valve failure, the determination device being applied to an ECU that controls opening and closing of the cutoff valve included in a PFAV valve included in an engine, characterized by comprising:

a first determining unit, configured to obtain a current rotation speed of an engine, obtain a gas pressure in a shut-off valve at least when the current rotation speed is greater than or equal to a first preset rotation speed, obtain the first gas pressure, and determine an opening function failure of the shut-off valve when the first gas pressure is less than or equal to the first preset pressure, where the first preset rotation speed is less than a rated rotation speed of the engine;

The acquisition unit is used for acquiring the gas pressure in the cut-off valve once every preset time period to acquire a preset number of second gas pressures under the condition that the current rotating speed is larger than a second preset rotating speed and smaller than the first preset rotating speed;

and the second determining unit is used for determining the maximum value and the minimum value in the plurality of second gas pressures to obtain a first maximum gas pressure and a first minimum gas pressure, calculating the absolute value of the difference value between the first maximum gas pressure and the first minimum gas pressure, and determining the shutdown function fault of the shut-off valve under the condition that the absolute value of the difference value is smaller than or equal to a second preset pressure, wherein the second preset pressure is smaller than the first preset pressure.

9. A computer-readable storage medium, characterized in that the computer-readable storage medium comprises a stored program, wherein the program, when run, controls a device in which the computer-readable storage medium is located to perform the determination method of any one of claims 1 to 7.

10. An electronic device, comprising: one or more processors, memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs comprising instructions for performing the determining method of any of claims 1-7.