Method for determining a failure of a shut-off valve, determining device and electronic device

Abstract

The application provides a method and device for determining the failure of a cut-off valve and electronic equipment. The method comprises: obtaining the current speed of an engine; obtaining a first gas pressure if the current speed is greater than or equal to a first preset speed; determining the opening function failure of the cut-off valve if the first gas pressure is less than or equal to a first preset pressure; obtaining the gas pressure in the cut-off valve every preset time period if the current speed is greater than a second preset speed and less than the first preset speed, and obtaining a preset number of second gas pressures; determining the first maximum gas pressure and the first minimum gas pressure, calculating the absolute value of the difference between the first maximum gas pressure and the first minimum gas pressure, and determining the closing function failure of the cut-off valve if the absolute value of the difference is less than or equal to a second preset pressure. The application solves the problem that the cut-off valve cannot be diagnosed in time.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fault diagnosis of engine cut-off valves, in particular, to a cut-off valve fault determination method and device, a computer readable storage medium and an electronic device. BACKGROUND

[0002] At present, more and more engine products use Woodruff's PFAV valve (Proportional Flow Area Valve, PFAV for short), including PFAV cut-off valve, PFAV temperature and pressure sensor and PFAV pressure regulating valve. At the same time, more and more ECUs (Electronic Control Unit, ECU for short) are adapted to PFAV valves, but in the actual application process, even if the PFAV valve is connected normally, there may be immature ECU program or PFAV valve reasons, which leads to occasional failure of the PFAV cut-off valve. Especially for the engine with master and slave ECUs each controlling a PFAV valve, if one side of the PFAV cut-off valve fails to open, it can still start normally, and long-term operation or loading in this working condition may damage the engine and cause safety problems. If the PFAV cut-off valve fails to close, it may cause safety hazards and economic losses.

[0003] Therefore, how to diagnose whether the PFAV cut-off valve fails in time is a problem to be solved at present. SUMMARY

[0004] The main purpose of the present application is to provide a cut-off valve fault determination method and device, a computer readable storage medium and an electronic device, so as to at least solve the problem that the prior art cannot diagnose the fault of the cut-off valve in time.

[0005] In order to achieve the above object, according to one aspect of the present application, a method for determining a fault of a cut-off valve is provided, the method being applied to an ECU which controls opening and closing of the cut-off valve in an engine, the cut-off valve being included in a PFAV valve, the PFAV valve being included in the engine, the method comprising: obtaining a current speed of the engine; obtaining a gas pressure in the cut-off valve to obtain a first gas pressure, at least in a case where the current speed is greater than or equal to a first preset speed, the first preset speed being less than a rated speed of the engine; determining that an opening function of the cut-off valve is faulty, in a case where the first gas pressure is less than or equal to a first preset pressure; obtaining the gas pressure in the cut-off valve every preset time interval to obtain a preset number of second gas pressures, in a case where the current speed is greater than a second preset speed and less than the first preset speed; 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; and calculating an absolute value of a difference between the first maximum gas pressure and the first minimum gas pressure, and determining that a closing function of the cut-off valve is faulty, in a case where the absolute value of the difference is less than or equal to a second preset pressure, the second preset pressure being less than the first preset pressure.

[0006] Optionally, the PFAV valve further comprises a pressure regulating valve, and the obtaining the gas pressure in the cut-off valve, at least in the case where the current speed is greater than or equal to the first preset speed, comprises: obtaining a pre-valve pressure of the cut-off valve, and determining whether the pre-valve pressure is greater than a third preset pressure, the pre-valve pressure being a pressure of a pipeline upstream of the cut-off valve; determining whether the cut-off valve is in an open state, and obtaining an opening degree of the pressure regulating valve and determining whether the opening degree is greater than a preset opening degree, in a case where the cut-off valve is in the open state; and obtaining the gas pressure in the cut-off valve, in a case where the pre-valve pressure is greater than the third preset pressure, the cut-off valve is in the open state, and the opening degree of the pressure regulating valve is greater than the preset opening degree.

[0007] Optionally, after determining that the opening function of the cut-off valve is faulty, the method further comprises: controlling the speed of the engine to be 0; a first obtaining step of obtaining the gas pressure in the cut-off valve to obtain a third gas pressure; a first determining step of determining that the opening function of the cut-off valve is faulty, in a 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 greater than the first preset pressure, and determining that the opening function of the cut-off valve is normal.

[0008] Optionally, the acquiring the gas pressure in the cut-off valve every preset time interval to obtain a preset number of second gas pressures comprises: a second determining step of determining a current number of the second gas pressures that have been acquired to obtain a current number; a second acquiring step of acquiring the gas pressure in the cut-off valve every preset time interval when the current number is less than the preset number; and sequentially repeating the second determining step and the second acquiring step at least once until the current number is greater than or equal to the preset number to obtain a preset number of the second gas pressures.

[0009] Optionally, the determining the maximum value and the minimum value of the plurality of second gas pressures comprises: determining whether the engine speed corresponding to the second gas pressure acquired last time is greater than the second preset engine speed; and determining the maximum value and the minimum value of the plurality of second gas pressures when the engine speed corresponding to the second gas pressure acquired last time is greater than the second preset engine speed.

[0010] Optionally, after determining that the cut-off function of the cut-off valve is faulty, the determining method further comprises: controlling the engine speed to be 0; a third acquiring step of acquiring the gas pressure in the cut-off valve every preset time interval to obtain a preset number of fourth gas pressures; a calculating step of determining the maximum value and the minimum value of the plurality of fourth gas pressures to obtain a second maximum gas pressure and a second minimum gas pressure, and calculating the absolute value of the difference between the second maximum gas pressure and the second minimum gas pressure; and a third determining step of determining that the cut-off function of the cut-off valve is normal when the absolute value of the difference between the second maximum gas pressure and the second minimum gas pressure is greater than the second preset pressure; and sequentially repeating the third acquiring step, the calculating step and the third determining step at least once until the absolute value of the difference between the second maximum gas pressure and the second minimum gas pressure is greater than the second preset pressure.

[0011] Optionally, the determining method further comprises: determining that the cut-off function of the cut-off valve is normal when the absolute value of the difference is greater than the second preset pressure.

[0012] According to another aspect of the present application, there is provided a determination apparatus for determining a fault of a cut-off valve, the determination apparatus being applied to an ECU, the ECU controlling opening and closing of the cut-off valve in an engine, the cut-off valve being included in a PFAV valve, the PFAV valve being included in the engine, comprising: a first determination unit configured to acquire a current speed of the engine, acquire a gas pressure in the cut-off valve to obtain a first gas pressure at least in a case where the current speed is greater than or equal to a first preset speed, the first preset speed being less than a rated speed of the engine, and determine an opening function fault of the cut-off valve in a case where the first gas pressure is less than or equal to a first preset pressure; an acquisition unit configured to acquire the gas pressure in the cut-off valve every preset time period to obtain a preset number of second gas pressures in a case where the current speed is greater than a second preset speed and less than the first preset speed; and a second determination unit 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 closing function fault of the cut-off valve in a case where the absolute value of the difference is less than or equal to a second preset pressure, the second preset pressure being less than the first preset pressure.

[0013] According to still another aspect of the present application, there is provided a computer-readable storage medium including a stored program, wherein the computer-readable storage medium is caused to perform any of the determination methods when the program is executed.

[0014] According to yet another aspect of the present application, there is provided an electronic device comprising 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 including instructions for performing any of the determination methods.

[0015] The technical scheme of the application is applied to obtain the current rotating speed of the engine, and in the case that the current rotating speed of the engine is greater than or equal to the first preset rotating speed, that is, the engine is in the starting state, the gas pressure in the cut-off valve is obtained to obtain the first gas pressure, and in the case that the first gas pressure is less than or equal to the first preset pressure, it is indicated that there is not enough gas into the valve, and it is determined that the opening function of the cut-off valve is faulty; in the case that the current rotating speed is greater than the second preset rotating speed, the gas pressure is obtained every interval preset time period, a total of a preset number of times, a preset number of second gas pressures are obtained, and the absolute value of the difference between the maximum value and the minimum value in the plurality of second gas pressures is determined to obtain the first maximum gas pressure and the first minimum gas pressure, and since the pressure in the valve will decrease in a short time in the case that the cut-off function is normal, the absolute value of the difference should be large, therefore, in the case that the absolute value of the difference between the first maximum gas pressure and the first minimum gas pressure is less than the second preset pressure, it is determined that the cut-off function of the cut-off valve is faulty, so that whether the cut-off valve is faulty can be diagnosed in time. In the prior art, the cut-off valve cannot be found to be faulty in time, which leads to insufficient or excessive air intake of the engine, and further causes engine failure and other problems, and the application can determine whether the cut-off valve is faulty in time in the starting state of the engine, and further causes engine failure. Therefore, the problem that the cut-off valve cannot be diagnosed whether it is faulty in time in the prior art can be solved. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the specification explain the present application. The use of the same reference numerals in different drawings indicates similar or identical components.

[0017] Figure 1 A hardware structure block diagram of a mobile terminal for executing a determination method of a cut-off valve fault is shown, which is provided by an embodiment of the present application;

[0018] Figure 2 A flowchart of a determination method of a cut-off valve fault is shown, which is provided by an embodiment of the present application;

[0019] Figure 3 A flowchart of determining whether the opening function is faulty in a specific determination method of a cut-off valve fault is shown, which is provided by an embodiment of the present application;

[0020] Figure 4 A flowchart of determining whether the cut-off function is faulty in a specific determination method of a cut-off valve fault is shown, which is provided by an embodiment of the present application;

[0021] Figure 5 A flowchart of obtaining a plurality of second gas pressures in a specific determination method of a cut-off valve fault is shown, which is provided by an embodiment of the present application;

[0022] Figure 6 A structure block diagram of a determination device for a cut-off valve failure is shown.

[0023] Wherein, the above figures include the following reference signs:

[0024] 102, processor; 104, memory; 106, transmission device; 108, input and output device. DETAILED DESCRIPTION

[0025] It should be noted that the embodiments and features in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0026] In order for those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present application.

[0027] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0028] For the convenience of description, the following describes some nouns or terms related to the embodiments of the present application:

[0029] PFAV valve: proportional flow area valve, a valve for controlling gas flow, including PFAV cut-off valve, PFAV temperature pressure sensor, PFAV pressure regulating valve three parts.

[0030] PFAV cut-off valve: shut down and open the upstream gas path of PFAV valve, determine whether the upstream gas enters the valve of PFAV valve.

[0031] ECU: electronic control unit.

[0032] As described in the background section, existing technologies cannot promptly diagnose whether a PFAV shut-off valve has malfunctioned. To address the problem of not being able to promptly diagnose whether a PFAV shut-off valve has malfunctioned, embodiments of this application provide a method, apparatus, computer-readable storage medium, and electronic device for determining shut-off valve malfunctions.

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0034] The methods and embodiments provided in this application can be executed on a mobile terminal, computer terminal, or similar computing device. Taking running on a mobile terminal as an example, Figure 1 This is a hardware structure block diagram of a mobile terminal for a method of determining a shut-off valve malfunction according to an embodiment of the present invention. Figure 1 As shown, a mobile terminal may include one or more ( Figure 1 Only one is shown in the diagram. A processor 102 (which may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.) and a memory 104 for storing data are also shown. The mobile terminal may further include a transmission device 106 for communication functions and an input / output device 108. Those skilled in the art will understand that... Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the mobile terminal described above. For example, the mobile terminal may also include components that are more... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown.

[0035] The memory 104 can be used to store computer programs, such as software programs of application software and modules, such as the computer program corresponding to the method for determining failure of a cut-off valve in the embodiments of the present application. The processor 102 can execute various functional applications and data processing, i.e., implement the above method, by running the computer programs stored in the memory 104. The memory 104 can include a high-speed random access memory, and can further include a non-volatile memory, such as one or more magnetic storage devices, flash memories, or other non-volatile solid-state memories. In some examples, the memory 104 can further include memories remotely arranged with respect to the processor 102, which can be connected to the mobile terminal through a network. Examples of the above network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof. The transmission device 106 is used to receive or send data via a network. The specific examples of the above network can include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 can be a radio frequency (RF) module, which is used to communicate with the Internet in a wireless manner.

[0036] In the embodiments, a method for determining failure of a cut-off valve running on a mobile terminal, a computer terminal or a similar computing device is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that herein.

[0037] Figure 2 is a flowchart of the method for determining failure of a cut-off valve according to the embodiments of the present application. The above method is applied to an ECU, the ECU controls opening and closing of the cut-off valve in an engine, the cut-off valve is included in a PFAV valve, the PFAV valve is included in the engine, as shown in Figure 2 the method includes the following steps:

[0038] In step S201, a current speed of the engine is obtained, and at least in a case where the current speed is greater than or equal to a first preset speed, a gas pressure in the cut-off valve is obtained to obtain a first gas pressure, and in a case where the first gas pressure is less than or equal to a first preset pressure, it is determined that the opening function of the cut-off valve is faulty, wherein the first preset speed is less than a rated speed of the engine.

[0039] Specifically, the application determines whether the function of the cut-off valve is abnormal when the engine starts running, and thus, firstly, the current speed of the engine is acquired, which can be the drag speed of the starter or any speed value less than the rated speed of the engine. When the current speed is greater than or equal to the first preset speed, it indicates that the engine is in the starting state, and the gas pressure in the PFAV valve is acquired to obtain the first gas pressure. When the PFAV cut-off valve is opened, the gas path is unobstructed, and the gas can enter the PFAV valve. When the PFAV cut-off valve is closed, the gas path is closed, and the gas cannot enter the PFAV valve. The characteristic of the PFAV valve is that the pressure in the valve is greater than the pressure downstream of the PFAV valve by about 0.8-1.1 bar. Therefore, if the PFAV valve can be normally opened, the pressure in the valve should be relatively large. By using this characteristic, it can be determined whether the opening function of the cut-off valve is normal. The first preset pressure can be 1.5 bar. If the first gas pressure is less than or equal to the first preset pressure, i.e., 1.5 bar, it can be determined that the opening function of the cut-off valve is faulty, resulting in insufficient pressure in the valve.

[0040] Step S202, in the case where the current speed is greater than the second preset speed and less than the first preset speed, the gas pressure in the cut-off valve is acquired every preset time period to obtain a preset number of second gas pressures;

[0041] Specifically, in addition to determining whether the opening function of the cut-off valve is faulty, it is also necessary to determine whether the closing function of the cut-off valve is faulty. When the engine starts to rotate but the speed is less than the first preset speed, i.e., the current speed is greater than the second preset speed and less than the first preset speed, the second preset speed can be 50 r / min. The opening time of the PFAV valve is slightly earlier than the opening time of the PFAV cut-off valve in the existing data calibration, which can cause the pressure in the PFAV valve to drop for a short time. If the PFAV cut-off valve is not closed well, the pressure in the PFAV valve will not drop as much. By using this characteristic, it can be determined that the PFAV cut-off valve cannot be normally closed. Therefore, the gas pressure in the cut-off valve is acquired every preset time period, and the preset time period can be 0.15 seconds, and the preset number can be 5.

[0042] Step S203, the maximum and minimum of the plurality of second gas pressures are determined to obtain the first maximum gas pressure and the first minimum gas pressure, the absolute value of the difference between the first maximum gas pressure and the first minimum gas pressure is calculated, and when the absolute value of the difference is less than or equal to the second preset pressure, it is determined that the closing function of the cut-off valve is faulty, wherein the second preset pressure is less than the first preset pressure.

[0043] Specifically, after obtaining the second gas pressure of the preset number of times, the maximum value and the minimum value are determined to obtain the first maximum gas pressure and the first minimum gas pressure. Whether the pressure difference is large, i.e., whether the pressure in the valve decreases in a short time, is determined by the absolute value of the difference between the maximum value and the minimum value. The second preset pressure can be 200hpa. In the case where the absolute value of the difference is less than or equal to the second preset pressure, it indicates that the pressure in the valve does not decrease enough in a short time, and it can be determined that the shut-off function of the cut-off valve fails.

[0044] By this embodiment, the current speed of the engine is obtained. In the case where the current speed of the engine is greater than or equal to the first preset speed, i.e., the engine is in the starting state, the gas pressure in the cut-off valve is obtained to obtain the first gas pressure. In the case where the first gas pressure is less than or equal to the first preset pressure, it indicates that not enough gas enters the valve, and it is determined that the opening function of the cut-off valve fails. In the case where the current speed is greater than the second preset speed, the gas pressure is obtained every preset time interval, a total of a preset number of times, to obtain a preset number of second gas pressures, and the absolute value of the difference between the maximum value and the minimum value of the plurality of second gas pressures is determined to obtain the first maximum gas pressure and the first minimum gas pressure. Since the pressure in the valve will decrease in a short time in the case where the shut-off function is normal, the absolute value of the difference should be large. Therefore, in the case where the absolute value of the difference between the first maximum gas pressure and the first minimum gas pressure is less than the second preset pressure, it is determined that the shut-off function of the cut-off valve fails. In this way, whether the cut-off valve fails can be diagnosed in time. In the prior art, the failure of the cut-off valve cannot be found in time, which leads to insufficient or excessive intake of the engine, and further causes engine failure and other problems. The present application can determine whether the cut-off valve fails in time in the starting state of the engine, and avoid further causing engine failure. Therefore, the problem that the cut-off valve cannot be diagnosed in time in the prior art can be solved.

[0045] In the implementation process, the PFAV valve further comprises a pressure regulating valve, and the step S201 can be implemented by the following steps: acquiring the valve front pressure of the cut-off valve, determining whether the valve front pressure is greater than a third preset pressure, wherein the valve front pressure is the pressure of the pipeline upstream of the cut-off valve; determining whether the cut-off valve is in an open state, and in the case that the cut-off valve is in the open state, acquiring the opening degree of the pressure regulating valve and determining whether the opening degree is greater than a preset opening degree; and in the case that the valve front pressure is greater than the third preset pressure, the cut-off valve is in the open state, and the opening degree of the pressure regulating valve is greater than the preset opening degree, acquiring the gas pressure in the cut-off valve. The method acquires the gas pressure in the cut-off valve under the condition that the above conditions are met, so that the gas pressure can be acquired under the condition that certain working conditions are met, and whether the cut-off valve fails is determined according to the gas pressure under the working condition, so that the fault can be diagnosed more accurately.

[0046] Specifically, it is necessary to determine whether the cut-off valve fails under the condition that the engine meets certain working conditions, so as to ensure the correctness of the determination result. The valve front pressure of the cut-off valve is the pressure of the PFAV front pipeline, the third preset pressure can be a bar pressure, for example: 1.5 bar, and the preset opening degree is a percentage opening degree, for example: 40%. In the case that the speed of the engine is greater than the first preset speed, i.e. the drag speed of the starter, the valve front pressure is greater than the third preset pressure, the cut-off valve is in the open state, and the opening degree of the pressure regulating valve is greater than the preset opening degree of 40%, the gas pressure in the cut-off valve is acquired, and then it is judged whether a fault occurs.

[0047] In order to further determine whether the opening function of the cut-off valve returns to normal, after the step S201, the determination method further comprises the following steps: controlling the 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 determination step of determining that the opening function of the cut-off valve fails in the case that the third gas pressure is less than or equal to the first preset pressure; and sequentially repeating the first acquisition step and the first determination step at least once until the third gas pressure is greater 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 that the opening function fails, so that whether the opening function of the cut-off valve returns to normal can be determined in time.

[0048] In the specific implementation process, after determining the opening function failure of the cut-off valve, the ECU controls the engine speed to be 0, that is, the engine speed is limited or the engine is protected from being shut down. Then, the gas pressure in the cut-off valve is obtained again to obtain a third gas pressure. In the case where the third gas pressure is less than or equal to the first preset pressure 1.5 bar, it is still determined that the opening function of the cut-off valve fails, and then the gas pressure needs to be obtained again until the third gas pressure is greater than the first preset pressure, indicating that the opening function of the cut-off valve has returned to normal. At this time, the ECU can control the engine to start again.

[0049] In some optional embodiments, step S202 can be implemented by the following method: a second determination step of determining the number of the second gas pressures that have been obtained at present to obtain a current number; a second acquisition step of obtaining the gas pressure in the cut-off valve at intervals of the preset time period in the case where the current number is less than the preset number; and sequentially repeating the second determination step and the second acquisition step at least once until the current number is greater than or equal to the preset number to obtain the preset number of the second gas pressures. This method obtains the preset number of the second gas pressures, which can more accurately determine whether the difference between the maximum value and the minimum value of the gas satisfies the pressure difference condition and whether the failure occurs.

[0050] Specifically, in the case where the engine speed is greater than the second preset speed and less than the first preset speed, the gas pressure in the cut-off valve is obtained, and it is determined whether the number of the obtained second gas pressures, that is, the current number, is less than the preset number. In the case where the current number is less than the preset number, the gas pressure is continuously obtained at intervals of the preset time period until the current number is greater than or equal to the preset number, and the loop is exited to obtain the preset number of the second gas pressures.

[0051] In order to ensure that the obtained second gas pressures all satisfy the working condition, step S203 can be implemented by the following steps: determining whether the engine speed corresponding to the last obtained second gas pressure is greater than the second preset speed; and determining the maximum value and the minimum value of the plurality of second gas pressures in the case where the engine speed corresponding to the last obtained second gas pressure is greater than the second preset speed. This method determines whether the engine speed corresponding to the last obtained second gas pressure is greater than the second preset speed, which can prevent the engine from being interrupted during the starting process, and the problem that the second gas pressure obtained in the interruption case is inaccurate.

[0052] In the implementation process, it must be ensured that the plurality of second fuel gas pressures collected are collected in the starting process of the engine. Therefore, whether the rotation speed corresponding to the last collected second fuel gas pressure is greater than the second preset rotation speed is determined to determine whether the plurality of collected second fuel gas pressures are in the starting process. If the last collected second preset rotation speed is greater than or equal to the second preset rotation speed, it indicates that the entire collection process is in the starting process, and the engine starting is uninterrupted. If the last collected second preset rotation speed is less than the second preset rotation speed, it indicates that the engine may have been interrupted in the starting process. At this time, the plurality of collected second fuel gas pressures are inaccurate and need to be re-collected.

[0053] After the above step S203, the above determination method further includes the following steps: controlling the rotation speed of the engine to be 0; a third acquisition step, acquiring the fuel gas pressure in the cut-off valve every preset time period to obtain a preset number of fourth fuel gas pressures; a calculation step, determining the maximum value and the minimum value of the plurality of fourth fuel gas pressures to obtain a second maximum fuel gas pressure and a second minimum fuel gas pressure, and calculating the absolute value of the difference between the second maximum fuel gas pressure and the second minimum fuel gas pressure; a third determination step, in the case that the absolute value of the difference between the second maximum fuel gas pressure and the second minimum fuel gas pressure is less than or equal to the second preset pressure, determining that the shut-off function of the cut-off valve is faulty; sequentially repeating the third acquisition step, the calculation step and the third determination step at least once until the absolute value of the difference between the second maximum fuel gas pressure and the second minimum fuel gas pressure is greater than the second preset pressure, and determining that the shut-off function of the cut-off valve is normal. After determining that the shut-off function of the cut-off valve is faulty, the method repeatedly acquires the fuel gas pressure in the cut-off valve until the absolute value of the difference between the maximum fuel gas pressure and the minimum fuel gas pressure is greater than the second preset pressure, and determines that the shut-off function of the cut-off valve is normal. In this way, whether the shut-off function of the cut-off valve is restored to normal can be determined in time.

[0054] Specifically, after determining that the shut-off function of the cut-off valve is faulty, the rotation speed of the engine is controlled to be 0, that is, the rotation speed of the engine is limited. Then, the fuel gas pressure is acquired every preset time period to obtain a preset number of fourth fuel gas pressures, and the absolute value of the difference between the maximum value and the minimum value is calculated. In the case that the absolute value of the difference is less than or equal to the second preset pressure, it is determined that the shut-off function is faulty. The above steps are repeated until the absolute value of the difference is greater than the second preset pressure, and it is determined that the shut-off function of the cut-off valve is restored to normal.

[0055] In order to accurately determine whether the closing function of the cut-off valve is normal, the above determination method further comprises the following steps: in the case that the absolute value of the difference is greater than the second preset pressure, it is determined that the closing function of the cut-off valve is normal. In the case that the absolute value of the difference is greater than the second preset pressure, the method determines that the closing function of the cut-off valve is normal, so that the closing function of the cut-off valve can be accurately determined to be normal.

[0056] 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 less than or equal to the second preset pressure, it is determined that the closing function of the cut-off valve is faulty, and therefore, in the case that the absolute value of the difference between the first maximum gas pressure and the first minimum gas pressure is greater than the second preset pressure, it is determined that the closing function of the cut-off valve is normal.

[0057] In order to enable those skilled in the art to more clearly understand the technical solutions of the present application, the implementation process of the determination method of the cut-off valve fault of the present application will be described in detail below in combination with specific embodiments.

[0058] The present embodiment relates to a specific determination method of a cut-off valve fault, comprising the following steps:

[0059] Step S1: Figure 3 A flow chart for determining whether the opening function is faulty in a specific determination method of a cut-off valve fault, in the case that the engine speed (current speed) is greater than or equal to the starter drag speed (first preset speed), the PFAV valve front pipeline pressure (valve front pressure) is greater than or equal to the gauge pressure 1.5 bar (third preset pressure), the cut-off valve is opened, and the PFAV pressure regulating valve actual opening degree (opening degree of the pressure regulating valve) is greater than or equal to the gauge opening degree 40% (preset opening degree), the PFAV valve internal pressure (gas pressure in the cut-off valve) is obtained, and the first gas pressure is obtained;

[0060] Step S2: determining whether the PFAV valve internal pressure (gas pressure in the cut-off valve) is greater than the gauge pressure 1.5 bar ± 0.2 bar (first preset pressure), in the case that the PFAV valve internal pressure (gas pressure in the cut-off valve) is less than or equal to the gauge pressure (first preset pressure), it is determined that the PFAV valve cannot be normally opened (the opening function of the cut-off valve is faulty), the fault indicating signal "DSM_FAULT_PERCENT_100" is turned on, and the stResult signal end of the DSM_DebTUD of the ECU is transmitted to inform the ECU that the opening function of the cut-off valve is faulty;

[0061] Step S3: In the case that the pressure in the PFAV valve (the pressure of the fuel gas in the cut-off valve) is greater than the markable pressure (the first preset pressure), it is determined that the PFAV valve can be normally opened, the normal signal "DSM_FAULT_PERCENT_00" is turned on, and the stResult signal end of the DSM_DebTUD of the ECU is informed that the opening function of the cut-off valve is normal.

[0062] Step S4: Figure 4 A flow chart for determining whether the shut-off function is faulty in a specific cut-off valve fault determination method, when the engine speed is greater than the markable speed (for example, 50 revolutions) (the second preset speed), the N* number of PFAV valve pressures (for example, 0.15 seconds, 5 times) are obtained every storage interval time (every preset time period), a plurality of second fuel gas pressures are obtained, and a PFAV valve pressure array [i] is generated.

[0063] Step S5: After the fifth PFAV valve pressure is obtained, the data validity state is determined by determining whether the engine speed is greater than the markable speed (for example, 50 revolutions) (the second preset speed), and after the fifth data validity state is determined to be 1, the maximum value and the minimum value of the 5 groups of data are obtained, the difference (the absolute value of the difference) between the maximum value and the minimum value of the PFAV valve is obtained, and the absolute value of the difference is less than or equal to the PFAV valve pressure drop calibration value (for example, 200 hpa), it is determined that the PFAV cut-off valve cannot be normally shut off, the fault signal "DSM_FAULT_PERCENT_100" is turned on, and the stResult signal end of the DSM_DebTUD of the ECU is informed that the shut-off function of the cut-off valve is faulty.

[0064] Step S6: The absolute value of the difference is greater than the PFAV valve pressure drop calibration value (for example, 200 hpa), it is determined that the PFAV cut-off valve can be normally shut off, the normal signal "DSM_FAULT_PERCENT_00" is turned on, and the stResult signal end of the DSM_DebTUD of the ECU is informed that the shut-off function of the cut-off valve is normal.

[0065] Figure 5 A flow chart for obtaining a plurality of second fuel gas pressures in a specific cut-off valve fault determination method, comprising the following steps:

[0066] Step S10: Start;

[0067] Step S11: Identify that the engine speed is greater than 50 revolutions (the second preset speed), if yes, execute step S12, if no, execute step S22;

[0068] Step S12: Get rising edge: i==1;

[0069] Step S13: delay 0.15 seconds (preset time period);

[0070] Step S14: current PFAV valve pressure assignment array[i], i==i+1;

[0071] Step S15: determine whether i≤5 (preset number), if yes, execute step S13, if no, execute step S16;

[0072] Step S16: determine whether current engine speed is greater than 50 revolutions, if yes, execute step S17, if no, execute step S22;

[0073] Step S17: compare maximum value and minimum value of 5 groups of numbers;

[0074] Step S18: maximum value-minimum value;

[0075] Step S19: determine whether the difference is less than 200hpa, if yes, execute step S22, if no, cure the fault;

[0076] Step S20: report the fault;

[0077] Step S21: cure the fault;

[0078] Step S22: end.

[0079] The embodiment of the present application also provides a determination device for a cut-off valve fault. It should be noted that the determination device for a cut-off valve fault of the embodiment of the present application can be used to execute the determination method for a cut-off valve fault provided by the embodiment of the present application. The device is used to realize the above-mentioned embodiment and preferred embodiment, and the description has been made. As used below, the term "module" can be a combination of software and / or hardware that realizes a predetermined function. Although the device described in the following embodiment is preferably realized in software, the realization of hardware, or a combination of software and hardware, is also possible and conceived.

[0080] The determination device for a cut-off valve fault provided by the embodiment of the present application is described below.

[0081] Figure 6 is a schematic diagram of the determination device for a cut-off valve fault according to the embodiment of the present application. The above-mentioned determination device is applied to an ECU, the above-mentioned ECU controls the opening and closing of the above-mentioned cut-off valve in an engine, the above-mentioned cut-off valve is included in a PFAV valve, the above-mentioned PFAV valve is included in the above-mentioned engine, as shown in Figure 6 , the device comprises:

[0082] The first determining unit 10 is configured to acquire a current rotating speed of the engine, acquire a gas pressure in the cut-off valve to obtain a first gas pressure at least when the current rotating speed is greater than or equal to a first preset rotating speed, and determine that the opening function of the cut-off valve is faulty when the first gas pressure is less than or equal to a first preset pressure, wherein the first preset rotating speed is less than a rated rotating speed of the engine.

[0083] Specifically, the application determines whether the function of the cut-off valve is abnormal when the engine starts to operate, and thus, the current rotating speed of the engine is acquired first, and the first preset rotating speed can be a drag rotating speed of a starter or any rotating speed value less than the rated rotating speed of the engine. When the current rotating speed is greater than or equal to the first preset rotating speed, it indicates that the engine is in a starting state, and the gas pressure in the PFAV valve is acquired at this time to obtain the first gas pressure. Since the gas path is unblocked when the PFAV cut-off valve is opened, the gas can enter the PFAV valve, and the gas path is blocked when the PFAV cut-off valve is closed, and the gas cannot enter the PFAV valve. The characteristic of the PFAV valve is that the pressure in the valve is greater than the pressure downstream of the PFAV valve by about 0.8 bar to 1.1 bar. Therefore, if the PFAV valve can be normally opened, the pressure in the valve should be relatively large, and this characteristic can be used to determine whether the opening function of the cut-off valve is normal. The first preset pressure can be 1.5 bar, and if the first gas pressure is less than or equal to the first preset pressure, i.e., 1.5 bar, it can be determined that the opening function of the cut-off valve is faulty, resulting in insufficient pressure in the valve.

[0084] The acquiring unit 20 is configured to acquire the gas pressure in the cut-off valve every preset time period to obtain a preset number of second gas pressures when the current rotating speed is greater than a second preset rotating speed and less than the first preset rotating speed.

[0085] Specifically, in addition to determining whether the opening function of the cut-off valve is faulty, it is also necessary to determine whether the closing function of the cut-off valve is faulty. When the engine starts to rotate but the rotating speed is less than the first preset rotating speed, i.e., the current rotating speed is greater than a second preset rotating speed and less than the first preset rotating speed, the second preset rotating speed can be 50 r / min. The opening time of the PFAV valve is slightly earlier than the opening time of the PFAV cut-off valve when the opening degree of the PFAV valve changes according to the existing data calibration, which can cause the pressure in the PFAV valve to decrease for a short time. If the closing state of the PFAV cut-off valve is relatively poor, the pressure decrease in the PFAV valve at this time will be weakened, and this characteristic can be used to identify that the PFAV cut-off valve cannot be normally closed. Therefore, the gas pressure in the cut-off valve is acquired every preset time period, and the preset time period can be 0.15 seconds, and the preset number can be 5.

[0086] The second determining unit 30 is configured to determine the maximum value and the minimum value of the plurality of second gas pressures, to obtain a first maximum gas pressure and a first minimum gas pressure, to calculate the absolute value of the difference between the first maximum gas pressure and the first minimum gas pressure, and to determine that the closing function of the cut-off valve is faulty 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.

[0087] Specifically, after obtaining the predetermined number of second gas pressures, the maximum value and the minimum value are determined to obtain the first maximum gas pressure and the first minimum gas pressure. Whether the pressure difference is large, i.e., whether the pressure in the valve decreases in a short time, is determined by the absolute value of the difference between the maximum value and the minimum value. The second preset pressure can be 200 hpa. When the absolute value of the difference is less than or equal to the second preset pressure, it indicates that the pressure in the valve does not decrease enough in a short time, and it can be determined that the closing function of the cut-off valve is faulty.

[0088] In this embodiment, the current speed of the engine is obtained. When the current speed of the engine is greater than or equal to a first preset speed, i.e., the engine is in an open state, the gas pressure in the cut-off valve is obtained to obtain a first gas pressure. When the first gas pressure is less than or equal to a first preset pressure, it indicates that not enough gas enters the valve, and it is determined that the opening function of the cut-off valve is faulty. When the current speed is greater than a second preset speed, the gas pressure is obtained every preset time interval, a total of a preset number of times, to obtain a preset number of second gas pressures. The absolute value of the difference between the maximum value and the minimum value of the plurality of second gas pressures is determined to obtain a first maximum gas pressure and a first minimum gas pressure. Since the pressure in the valve decreases in a short time when the closing function is normal, the absolute value of the difference should be large. Therefore, when the absolute value of the difference between the first maximum gas pressure and the first minimum gas pressure is less than a second preset pressure, it is determined that the closing function of the cut-off valve is faulty. In this way, whether the cut-off valve is faulty can be diagnosed in time. In the prior art, the cut-off valve cannot be found to be faulty in time, which leads to insufficient or excessive intake of the engine, and further causes engine failure. The present application can determine whether the cut-off valve is faulty in time when the engine is started, and avoid further causing engine failure. Therefore, the problem that the cut-off valve cannot be diagnosed to be faulty in time in the prior art can be solved.

[0089] In the 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 configured to obtain the valve front pressure of the cut-off valve, and determine whether the valve front pressure is greater than a third preset pressure, wherein the valve front pressure is the pressure of a pipeline upstream of the cut-off valve; the second determining module is configured to determine whether the cut-off valve is in an open state, and in the case that the cut-off valve is in the open state, obtain the opening degree of the pressure regulating valve, and determine whether the opening degree is greater than a preset opening degree; and the obtaining module is configured to obtain the gas pressure in the cut-off valve in the case that the valve front pressure is greater than the third preset pressure, the cut-off valve is in the open state, and the opening degree of the pressure regulating valve is greater than the preset opening degree. The device obtains the gas pressure in the cut-off valve in the case that the above conditions are met, so that the gas pressure can be obtained when certain working condition conditions are met, and whether the cut-off valve fails can be determined according to the gas pressure under the working condition conditions, so that the fault can be diagnosed more accurately.

[0090] Specifically, it is necessary to determine whether the cut-off valve fails in the case that the engine meets certain working condition conditions, so as to ensure the correctness of the determination result. The valve front pressure of the cut-off valve is the pressure of the PFAV front pipeline, the third preset pressure can be a bar pressure, for example, 1.5 bar, and the preset opening degree is a percentage opening degree, for example, 40%. In the case that the engine speed is greater than a first preset speed, i.e., the drag speed of the starter, the valve front pressure is greater than the third preset pressure, the cut-off valve is in the open state, and the opening degree of the pressure regulating valve is greater than the preset opening degree of 40%, the gas pressure in the cut-off valve is obtained, and then it is judged whether a fault occurs.

[0091] In order to further determine whether the opening function of the cut-off valve returns to normal, the determining device further comprises a first control module, a first obtaining module, a first determining module and a second determining module, wherein the first control module is configured to control the engine speed to be 0; the first obtaining module is configured to perform a first obtaining step to obtain the gas pressure in the cut-off valve to obtain a third gas pressure; the first determining module is configured to perform a first determining step to determine that the opening function of the cut-off valve fails in the case that the third gas pressure is less than or equal to the first preset pressure; and 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 cut-off valve is normal. The device sequentially repeats the steps after determining that the opening function fails, so that whether the opening function of the cut-off valve returns to normal can be determined in time.

[0092] In the specific implementation process, after determining that the opening function of the cut-off valve is faulty, the ECU controls the engine speed to be 0, that is, the engine speed is limited or the engine is protected from being shut down. Then, the gas pressure in the cut-off valve is obtained again to obtain a third gas pressure. In the case where the third gas pressure is less than or equal to the first preset pressure 1.5 bar, it is still determined that the opening function of the cut-off valve is faulty, and then the gas pressure needs to be obtained again until the third gas pressure is greater than the first preset pressure, indicating that the opening function of the cut-off valve has returned to normal. At this time, the ECU can control the engine to start again.

[0093] In some optional embodiments, the obtaining unit comprises a third determination module, a second obtaining module, and a repeating module. The third determination module is configured to perform the second determination step to determine the number of the second gas pressures that have been obtained at present, to obtain a current number. The second obtaining module is configured to perform the second obtaining step to obtain the gas pressure in the cut-off valve at intervals of the preset time period in the case where the current number is less than the preset number. The repeating module is configured to repeat the second determination step and the second obtaining step at least once in turn until the current number is greater than or equal to the preset number, to obtain the preset number of the second gas pressures. The device obtains the preset number of the second gas pressures, so that whether the difference between the maximum value and the minimum value of the gas pressures meets the pressure difference condition and whether the fault occurs can be determined more accurately.

[0094] Specifically, in the case where the engine speed is greater than the second preset speed and less than the first preset speed, the gas pressure in the cut-off valve is obtained, and it is determined whether the number of the second gas pressures obtained at present, that is, the current number, is less than the preset number. In the case where the current number is less than the preset number, the gas pressure is obtained again at intervals of the preset time period until the current number is greater than or equal to the preset number, and the loop is exited to obtain the preset number of the second gas pressures.

[0095] In order to ensure that the obtained second gas pressures all meet the working condition, the second determination unit comprises a fourth determination module and a fifth determination module. The fourth determination module is configured to determine whether the engine speed corresponding to the last obtained second gas pressure is greater than the second preset speed. The fifth determination module is configured to determine the maximum value and the minimum value of the plurality of second gas pressures in the case where the engine speed corresponding to the last obtained second gas pressure is greater than the second preset speed. In the case where the last obtained second gas pressure is obtained, the device determines whether the engine speed corresponding to the second gas pressure is greater than the second preset speed, so that the problem that the second gas pressure obtained in the case of interruption of the engine starting process is inaccurate can be prevented.

[0096] In the implementation process, it must be ensured that the plurality of collected second fuel gas pressures are collected in the starting process of the engine. Therefore, whether the rotation speed corresponding to the last collected second fuel gas pressure is greater than the second preset rotation speed is determined to determine whether the plurality of collected second fuel gas pressures are in the starting process. If the last collected second preset rotation speed is greater than or equal to the second preset rotation speed, it indicates that the entire collection process is the starting process, and the engine starting is uninterrupted. If the last collected second preset rotation speed is less than the second preset rotation speed, it indicates that the engine starting may be interrupted during the starting process. At this time, the plurality of collected second fuel gas pressures are inaccurate and need to be collected again.

[0097] The determination device further includes a second control module, a third acquisition module, a calculation module, a sixth determination module, and a seventh determination module. The second control module is configured to control the rotation speed of the engine to be 0. The third acquisition module is configured to perform the third acquisition step, and acquire the fuel gas pressure in the cut-off valve every preset time period to obtain the preset number of fourth fuel gas pressures. The calculation module is configured to perform the calculation step, determine the maximum value and the minimum value of the plurality of fourth fuel gas pressures to obtain a second maximum fuel gas pressure and a second minimum fuel gas pressure, and calculate the absolute value of the difference between the second maximum fuel gas pressure and the second minimum fuel gas pressure. The sixth determination module is configured to perform the third determination step, and determine that the shut-off function of the cut-off valve is faulty when the absolute value of the difference between the second maximum fuel gas pressure and the second minimum fuel gas pressure is less than or equal to the second preset pressure. The seventh determination module is configured to repeat the third acquisition step, the calculation step, and the third determination step at least once in turn until the absolute value of the difference between the second maximum fuel gas pressure and the second minimum fuel gas pressure is greater than the second preset pressure, and determine that the shut-off function of the cut-off valve is normal. After determining that the shut-off function of the cut-off valve is faulty, the device repeatedly acquires the fuel gas pressure in the cut-off valve until the absolute value of the difference between the maximum fuel gas pressure and the minimum fuel gas pressure is greater than the second preset pressure, and determines that the shut-off function of the cut-off valve is normal. In this way, whether the shut-off function of the cut-off valve is restored to normal can be determined in time.

[0098] Specifically, after determining that the shut-off function of the cut-off valve is faulty, the rotation speed of the engine is controlled to be 0, that is, the rotation speed of the engine is limited. Then, the fuel gas pressure is acquired every preset time period to obtain the preset number of fourth fuel gas pressures, and the absolute value of the difference between the maximum value and the minimum value is calculated. When the absolute value of the difference is less than or equal to the second preset pressure, it is determined that the shut-off function is faulty. The above steps are repeated until the absolute value of the difference is greater than the second preset pressure, and it is determined that the shut-off function of the cut-off valve is restored to normal.

[0099] In order to accurately determine whether the closing function of the cut-off valve is normal, the determination device further comprises an eighth determination module configured to determine that the closing function of the cut-off valve is normal when the absolute value of the difference is greater than the second preset pressure. The device determines that the closing function of the cut-off valve is normal when the absolute value of the difference is greater than the second preset pressure, so that the closing function of the cut-off valve can be accurately determined to be normal.

[0100] In the specific implementation process, as described above, when the absolute value of the difference between the first maximum gas pressure and the first minimum gas pressure is less than or equal to the second preset pressure, it is determined that the closing function of the cut-off valve is faulty. Therefore, when the absolute value of the difference between the first maximum gas pressure and the first minimum gas pressure is greater than the second preset pressure, it is determined that the closing function of the cut-off valve is normal.

[0101] The determination device of the cut-off valve fault comprises a processor and a memory, and the first determination unit, the acquisition unit and the second determination unit are all stored in the memory as program units. The corresponding functions are realized by the processor executing the program units stored in the memory. The modules are located in the same processor, or the modules are located in different processors in any combination.

[0102] The processor contains a core, and the core retrieves the corresponding program unit from the memory. The core can be set to one or more, and the core parameters can be adjusted to timely diagnose whether the cut-off valve is faulty.

[0103] The memory can include non-permanent memory in a computer readable medium, random access memory (RAM) and / or non-volatile memory such as read-only memory (ROM) or flash memory (flash RAM), and the memory includes at least one memory chip.

[0104] The embodiment of the application provides a computer readable storage medium, and the computer readable storage medium comprises a stored program. When the program runs, the computer readable storage medium controls the device on which the computer readable storage medium is located to execute the determination method of the cut-off valve fault.

[0105] Specifically, the determination method of the cut-off valve fault comprises:

[0106] In step S201, the current speed of the engine is acquired. At least when the current speed is greater than or equal to a first preset speed, the gas pressure in the cut-off valve is acquired to obtain a first gas pressure. When the first gas pressure is less than or equal to a first preset pressure, it is determined that the opening function of the cut-off valve is faulty. The first preset speed is less than the rated speed of the engine.

[0107] Specifically, the application determines whether the function of the cut-off valve is abnormal when the engine starts running, and thus, firstly, the current speed of the engine is acquired, which can be the drag speed of the starter or any speed value less than the rated speed of the engine. When the current speed is greater than or equal to the first preset speed, it indicates that the engine is in the starting state, and the gas pressure in the PFAV valve is acquired to obtain the first gas pressure. When the PFAV cut-off valve is opened, the gas path is unobstructed, and the gas can enter the PFAV valve. When the PFAV cut-off valve is closed, the gas path is closed, and the gas cannot enter the PFAV valve. The characteristic of the PFAV valve is that the pressure in the valve is greater than the pressure downstream of the PFAV valve by about 0.8-1.1 bar. Therefore, if the PFAV valve can be normally opened, the pressure in the valve should be relatively large. By using this characteristic, it can be determined whether the opening function of the cut-off valve is normal. The first preset pressure can be 1.5 bar. If the first gas pressure is less than or equal to the first preset pressure, i.e., 1.5 bar, it can be determined that the opening function of the cut-off valve is faulty, resulting in insufficient pressure in the valve.

[0108] In step S202, when the current speed is greater than the second preset speed and less than the first preset speed, the gas pressure in the cut-off valve is acquired every preset time period to obtain a preset number of second gas pressures.

[0109] Specifically, in addition to determining whether the opening function of the cut-off valve is faulty, it is also necessary to determine whether the closing function of the cut-off valve is faulty. When the engine starts to rotate but the speed is less than the first preset speed, i.e., the current speed is greater than the second preset speed and less than the first preset speed, the second preset speed can be 50 r / min. The opening time of the PFAV valve is slightly earlier than the opening time of the PFAV cut-off valve in the existing data calibration, which can cause the pressure in the PFAV valve to drop for a short time. If the closing state of the PFAV cut-off valve is poor, the pressure drop in the PFAV valve at this time will be weakened, and the PFAV cut-off valve cannot be normally closed by identifying this feature. Therefore, the gas pressure in the cut-off valve is acquired every preset time period, and the preset time period can be 0.15 seconds, and the preset number can be 5.

[0110] In step S203, the maximum and minimum values of the plurality of second gas pressures are determined to obtain the first maximum gas pressure and the first minimum gas pressure, and the absolute value of the difference between the first maximum gas pressure and the first minimum gas pressure is calculated. When the absolute value of the difference is less than or equal to the second preset pressure, it is determined that the closing function of the cut-off valve is faulty, wherein the second preset pressure is less than the first preset pressure.

[0111] Specifically, after obtaining the second gas pressure of the reservation quantity, the maximum value and the minimum value are determined to obtain the first maximum gas pressure and the first minimum gas pressure. Whether the pressure difference is large, i.e. whether the pressure in the valve is reduced in a short time, is determined by the absolute value of the difference between the maximum value and the minimum value. The second preset pressure can be 200hpa. In the case that the absolute value of the difference is less than or equal to the second preset pressure, it indicates that the pressure in the valve has not been reduced enough in a short time, and it can be determined that the closing function of the cut-off valve is faulty.

[0112] Optionally, the PFAV valve further comprises a pressure regulating valve. At least in the case that the current rotation speed is greater than or equal to the first preset rotation speed, the gas pressure in the cut-off valve is obtained, including: obtaining the pre-valve pressure of the cut-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 the pipeline upstream of the cut-off valve; determining whether the cut-off valve is in an open state, and in the case that the cut-off valve is in the open state, obtaining the opening degree of the pressure regulating valve and determining whether the opening degree is greater than a preset opening degree; in the case that the pre-valve pressure is greater than the third preset pressure, the cut-off valve is in the open state, and the opening degree of the pressure regulating valve is greater than the preset opening degree, the gas pressure in the cut-off valve is obtained.

[0113] Optionally, after determining that the opening function of the cut-off valve is faulty, the determination method further comprises: controlling the rotation speed of the engine to be 0; a first obtaining step of obtaining the gas pressure in the cut-off valve to obtain a third gas pressure; a first determining step of determining that the opening function of the cut-off valve is faulty in the case that the third gas pressure is less than or equal to the first preset pressure; sequentially repeating 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 determining that the opening function of the cut-off valve is normal.

[0114] Optionally, the gas pressure in the cut-off valve is obtained every 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 that have been obtained at present to obtain a current number; a second obtaining step of obtaining the gas pressure in the cut-off valve at intervals of the preset time period in the case that the current number is less than the preset number; sequentially repeating 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 to obtain the preset number of second gas pressures.

[0115] Optionally, the determining the maximum value and the minimum value of the plurality of second gas pressures comprises: determining whether the rotating speed of the engine corresponding to the last obtained second gas pressure is greater than the second preset rotating speed; and determining the maximum value and the minimum value of the plurality of second gas pressures in the case that the rotating speed of the engine corresponding to the last obtained second gas pressure is greater than the second preset rotating speed.

[0116] Optionally, after determining that the closing function of the cut-off valve is faulty, the determining method further comprises: controlling the rotating speed of the engine to be 0; a third obtaining step of obtaining the gas pressure in the cut-off valve every preset time period to obtain a preset number of fourth gas pressures; a calculating step of determining the maximum value and the minimum value of the plurality of fourth gas pressures to obtain a second maximum gas pressure and a second minimum gas pressure, and calculating the absolute value of the difference between the second maximum gas pressure and the second minimum gas pressure; a third determining step of determining that the closing function of the cut-off valve is faulty in the case that 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 sequentially repeating the third obtaining step, the calculating step and the third determining step at least once until the absolute value of the difference between the second maximum gas pressure and the second minimum gas pressure is greater than the second preset pressure, and determining that the closing function of the cut-off valve is normal.

[0117] Optionally, the determining method further comprises: determining that the closing function of the cut-off valve is normal in the case that the absolute value of the difference is greater than the second preset pressure.

[0118] An embodiment of the present application provides a device, which comprises a processor, a memory, and a program stored in the memory and capable of running on the processor, and the processor implements at least the following steps when executing the program:

[0119] In step S201, the current rotating speed of the engine is obtained, the gas pressure in the cut-off valve is obtained to obtain a first gas pressure at least in the case that the current rotating speed is greater than or equal to a first preset rotating speed, and the opening function of the cut-off valve is determined to be faulty in the case that the first gas pressure is less than or equal to a first preset pressure, wherein the first preset rotating speed is less than the rated rotating speed of the engine.

[0120] In step S202, the gas pressure in the cut-off valve is obtained every preset time period to obtain a preset number of second gas pressures in the case that the current rotating speed is greater than a second preset rotating speed and less than the first preset rotating speed.

[0121] Step S203, determining the maximum value and the minimum value of the plurality of the second gas pressures, obtaining a first maximum gas pressure and a first minimum gas pressure, calculating the absolute value of the difference between the first maximum gas pressure and the first minimum gas pressure, and determining the shutdown function failure of the cutoff valve in the case that 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.

[0122] The device herein can be a server, a PC, a PAD, a mobile phone, etc.

[0123] Optionally, the PFAV valve further comprises a pressure regulating valve, and the gas pressure in the cutoff valve is obtained at least in the case that the current rotating speed is greater than or equal to a first preset rotating speed, comprising: obtaining a valve front pressure of the cutoff valve, determining whether the valve front pressure is greater than a third preset pressure, wherein the valve front pressure is the pressure of a pipeline upstream of the cutoff valve; determining whether the cutoff valve is in an open state, obtaining an opening degree of the pressure regulating valve in the case that the cutoff valve is in the open state, and determining whether the opening degree is greater than a preset opening degree; and obtaining the gas pressure in the cutoff valve in the case that the valve front pressure is greater than the third preset pressure, the cutoff valve is in the open state, and the opening degree of the pressure regulating valve is greater than the preset opening degree.

[0124] Optionally, after determining the opening function failure of the cutoff valve, the determination method further comprises: controlling the rotating speed of the engine to be 0; a first obtaining step of obtaining the gas pressure in the cutoff valve to obtain a third gas pressure; a first determining step of determining the opening function failure of the cutoff valve in the case that 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 greater than the first preset pressure, and determining that the opening function of the cutoff valve is normal.

[0125] Optionally, the gas pressure in the cutoff valve is obtained every preset time period to obtain a preset number of second gas pressures, comprising: a second determining step of determining the number of the second gas pressures that have been obtained at present to obtain a current number; a second obtaining step of obtaining the gas pressure in the cutoff valve at intervals of the preset time period in the case that the current number is less than the preset number; and sequentially repeating 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 obtaining the preset number of the second gas pressures.

[0126] Optionally, the determining the maximum value and the minimum value of the plurality of second gas pressures comprises: determining whether the rotation speed of the engine corresponding to the last obtained second gas pressure is greater than the second preset rotation speed; and determining the maximum value and the minimum value of the plurality of second gas pressures in the case that the rotation speed of the engine corresponding to the last obtained second gas pressure is greater than the second preset rotation speed.

[0127] Optionally, after determining that the closing function of the cut-off valve is faulty, the determining method further comprises: controlling the rotation speed of the engine to be 0; a third obtaining step of obtaining the gas pressure in the cut-off valve every other preset time period to obtain a preset number of fourth gas pressures; a calculating step of determining the maximum value and the minimum value of the plurality of fourth gas pressures to obtain a second maximum gas pressure and a second minimum gas pressure, and calculating the absolute value of the difference between the second maximum gas pressure and the second minimum gas pressure; a third determining step of determining that the closing function of the cut-off valve is faulty in the case that 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 sequentially repeating the third obtaining step, the calculating step and the third determining step at least once until the absolute value of the difference between the second maximum gas pressure and the second minimum gas pressure is greater than the second preset pressure, and determining that the closing function of the cut-off valve is normal.

[0128] Optionally, the determining method further comprises: determining that the closing function of the cut-off valve is normal in the case that the absolute value of the difference is greater than the second preset pressure.

[0129] Obviously, those skilled in the art should understand that each module or each step of the present application can be realized by a general computing device, which can be concentrated on a single computing device or distributed on a network composed of multiple computing devices, and can be realized by program codes executable by the computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in different order, or they can be manufactured into individual integrated circuit modules, or multiple modules or steps can be manufactured into a single integrated circuit module. Thus, the present application is not limited to any specific combination of hardware and software.

[0130] Those skilled in the art will appreciate that embodiments of the application can be readily used as software, hardware, or a combination of software and hardware. In a typical configuration, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0131] The computer program instructions can 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 block or blocks. Figure 1 The computer program instructions can 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 block or blocks. Figure 1 The computer program instructions can 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 block or blocks.

[0132] The computer program instructions can 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 block or blocks. Figure 1 The computer program instructions can 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 block or blocks. Figure 1 The computer program instructions can 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 block or blocks.

[0133] The computer program instructions can 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 block or blocks. Figure 1 The computer program instructions can 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 block or blocks. Figure 1 The computer program instructions can 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 block or blocks.

[0134] In a typical configuration, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0135] The memory can include non-persistent memory and / or persistent memory, such as flash memory, read-only memory (ROM), and / or volatile or non-volatile random access memory (RAM), among others. The memory is an example of computer-readable media.

[0136] Computer-readable media includes permanent and non-permanent, movable and non-movable media that can be implemented by any method or technology to store information. The information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media 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 technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information accessible by a computing device. According to the definition herein, computer-readable media does not include transitory media such as modulated data signals and carriers.

[0137] It should also be noted that the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusion, so that processes, methods, articles or devices including a series of elements not only include those elements, but also include other elements not explicitly listed, or inherent to such processes, methods, articles or devices. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0138] From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects:

[0139] 1)、The application discloses a kind of determination methods of cut-off valve failure, obtain the current speed of engine, in the case where the current speed of engine is greater than or equal to first preset speed, i.e. engine is in the state of opening, obtain the gas pressure in cut-off valve to obtain first gas pressure, in the case where first gas pressure is less than or equal to first preset pressure, it indicates that there is not enough gas into valve, determine the opening function failure of cut-off valve;In the case where current speed is greater than second preset speed, obtain gas pressure every interval preset time period, obtain preset number times in total, obtain preset number of second gas pressure, and determine the absolute value of the difference between the maximum value and the minimum value in multiple second gas pressures, obtain first maximum gas pressure and first minimum gas pressure, since in the case where shutdown function is normal, valve pressure will drop in a short time, the absolute value of difference should be larger, thus, in the case where the absolute value of the difference of first maximum gas pressure and first minimum gas pressure is less than second preset pressure, determine the shutdown function failure of cut-off valve, so as to diagnose whether cut-off valve fails in time. With prior art, cut-off valve failure cannot be found in time, leading to insufficient or excessive air intake of engine, and further causing engine failure and other problems, the application can determine whether cut-off valve fails in time under the starting state of engine, to avoid further causing engine failure. Therefore, the problem that cut-off valve failure cannot be diagnosed in time in prior art can be solved.

[0140] 2)、The application discloses a kind of determination methods of cut-off valve failure, obtain the current speed of engine, in the case where the current speed of engine is greater than or equal to first preset speed, i.e. engine is in the state of opening, obtain the gas pressure in cut-off valve to obtain first gas pressure, in the case where first gas pressure is less than or equal to first preset pressure, it indicates that there is not enough gas into valve, determine the opening function failure of cut-off valve;In the case where current speed is greater than second preset speed, obtain gas pressure every interval preset time period, obtain preset number times in total, obtain preset number of second gas pressure, and determine the absolute value of the difference between the maximum value and the minimum value in multiple second gas pressures, obtain first maximum gas pressure and first minimum gas pressure, since in the case where shutdown function is normal, valve pressure will drop in a short time, the absolute value of difference should be larger, thus, in the case where the absolute value of the difference of first maximum gas pressure and first minimum gas pressure is less than second preset pressure, determine the shutdown function failure of cut-off valve, so as to diagnose whether cut-off valve fails in time. With prior art, cut-off valve failure cannot be found in time, leading to insufficient or excessive air intake of engine, and further causing engine failure and other problems, the application can determine whether cut-off valve fails in time under the starting state of engine, to avoid further causing engine failure. Therefore, the problem that cut-off valve failure cannot be diagnosed in time in prior art can be solved.

[0141] The above descriptions are only the preferred embodiments of the present application, and are not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method of determining a failure of a shut-off valve, characterized in that The determination method is applied to an ECU, the ECU controls opening and closing of the cut-off valve in an engine, the cut-off valve is included in a PFAV valve, the PFAV valve is included in the engine, and the determination method comprises: obtaining a current speed of the engine, obtaining a gas pressure in the cut-off valve to obtain a first gas pressure at least when the current speed is greater than or equal to a first preset speed, wherein the first preset speed is less than a rated speed of the engine, and determining an opening function failure of the cut-off valve when the first gas pressure is less than or equal to a first preset pressure; obtaining a gas pressure in the cut-off valve every preset time interval to obtain a preset number of second gas pressures when the current speed is greater than a second preset speed and less than the first preset speed; determining a maximum value and a minimum value in the plurality of second gas pressures to obtain a first maximum gas pressure and a first minimum gas pressure, and calculating an absolute value of a difference between the first maximum gas pressure and the first minimum gas pressure, wherein a closing function failure of the cut-off valve is determined when the absolute value of the difference is less than or equal to a second preset pressure, and the second preset pressure is less than the first preset pressure.

2. The determination method according to claim 1, characterized in that, The PFAV valve further comprises a pressure regulating valve, and obtaining a gas pressure in the cut-off valve comprises: obtaining a pre-valve pressure of the cut-off valve, and determining whether the pre-valve pressure is greater than a third preset pressure, wherein the pre-valve pressure is a pressure of a pipeline upstream of the cut-off valve; determining whether the cut-off valve is in an open state, obtaining an opening degree of the pressure regulating valve when the cut-off valve is in the open state, and determining whether the opening degree is greater than a preset opening degree; obtaining a gas pressure in the cut-off valve when the pre-valve pressure is greater than the third preset pressure, the cut-off valve is in the open state, and the opening degree of the pressure regulating valve is greater than the preset opening degree.

3. The determination method according to claim 1, characterized in that, After determining the opening function failure of the cut-off valve, the determination method further comprises: controlling the speed of the engine to be 0; a first obtaining step of obtaining a gas pressure in the cut-off valve to obtain a third gas pressure; a first determining step of determining the opening function failure of the cut-off valve when the third gas pressure is less than or equal to the first preset pressure; sequentially repeating 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 determining that the opening function of the cut-off valve is normal.

4. The determination method according to claim 1, characterized in that, obtaining a gas pressure in the cut-off valve every preset time interval to obtain a preset number of second gas pressures, comprising: a second determining step of determining a number of the second gas pressures that have been obtained at present to obtain a current number; a second obtaining step of obtaining a gas pressure in the cut-off valve at intervals of the preset time interval when the current number is less than the preset number; The second determination step and the second acquisition step are repeated in sequence at least once until the current quantity is greater than or equal to the preset quantity, and preset quantity of the second gas pressures are obtained.

5. The determination method of claim 1, wherein, The maximum value and the minimum value of the plurality of second gas pressures are determined, comprising: determining whether the engine speed corresponding to the last obtained second gas pressure is greater than the second preset speed; in the case that the engine speed corresponding to the last obtained second gas pressure is greater than the second preset speed, the maximum value and the minimum value of the plurality of second gas pressures are determined.

6. The determination method of claim 1, wherein, After determining that the closing function of the cut-off valve is faulty, the determination method further comprises: controlling the engine speed to be 0; a third acquisition step, acquiring the gas pressure in the cut-off valve every preset time period to obtain the preset quantity of fourth gas pressures; a calculation step, determining the maximum value and the minimum value of the plurality of fourth gas pressures to obtain a second maximum gas pressure and a second minimum gas pressure, and calculating the absolute value of the difference between the second maximum gas pressure and the second minimum gas pressure; a third determination step, in the case that 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, determining that the closing function of the cut-off valve is faulty; the third acquisition step, the calculation step and the third determination step are repeated in sequence at least once until the absolute value of the difference between the second maximum gas pressure and the second minimum gas pressure is greater than the second preset pressure, and it is determined that the closing function of the cut-off valve is normal.

7. The determination method of claim 1, wherein, The determination method further comprises: in the case that the absolute value of the difference is greater than the second preset pressure, it is determined that the closing function of the cut-off valve is normal.

8. A determination device of a cut valve failure, the determination device being applied to an ECU that controls opening and shutting of the cut valve in an engine, the cut valve being included in a PFAV valve, the PFAV valve being included in the engine, characterized by, comprising: a first determination unit, configured to acquire a current engine speed, acquire a gas pressure in a cut-off valve to obtain a first gas pressure at least in the case that the current engine speed is greater than or equal to a first preset speed, and determine that an opening function of the cut-off valve is faulty in the case that the first gas pressure is less than or equal to a first preset pressure, wherein the first preset speed is less than a rated speed of the engine; an acquisition unit, configured to acquire the gas pressure in the cut-off valve every preset time period to obtain a preset quantity of second gas pressures in the case that the current engine speed is greater than a second preset speed and less than the first preset speed; a second determination unit, configured to determine the maximum value and the minimum value of the plurality of second gas pressures to obtain a first maximum gas pressure and a first minimum gas pressure, calculate the absolute value of the difference between the first maximum gas pressure and the first minimum gas pressure, and determine that a closing function of the cut-off valve is faulty in the case that 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.

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

10. An electronic device, comprising: comprising: 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 including programs for performing the determining method of any one of claims 1 to 7.

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