阅读说明：本技术 供气系统的故障检测方法、装置及电子控制单元 (Fault detection method and device for gas supply system and electronic control unit ) 是由 曹石 秦涛 黄玉平 魏倩雯 李苑玮 于 2019-09-23 设计创作，主要内容包括：本发明实施例提供一种供气系统的故障检测方法、装置及电子控制单元,该方法包括：在检测到电子控制单元上电并启动发动机后,获取发动机的状态参数,根据状态参数判断发动机是否处于预设喷射阀关闭工况,若发动机处于预设喷射阀关闭工况,则获取燃气气轨的燃气压力值,若燃气压力值大于或等于第一预设压力值,则将稳压器存在故障的提示发送至报警装置,实现稳压器故障的自动检测,无需人工对车辆进行特定测试操作后,才能根据得到的测试结果确定稳压器是否存在故障,提高稳压器故障的检测效率。(The embodiment of the invention provides a fault detection method, a fault detection device and an electronic control unit of an air supply system, wherein the method comprises the following steps: after the electronic control unit is powered on and the engine is started, state parameters of the engine are obtained, whether the engine is in a preset injection valve closing working condition or not is judged according to the state parameters, if the engine is in the preset injection valve closing working condition, a gas pressure value of a gas rail is obtained, if the gas pressure value is larger than or equal to a first preset pressure value, a prompt that the voltage stabilizer fails is sent to an alarm device, automatic detection of the voltage stabilizer faults is achieved, after specific test operation on a vehicle is not needed manually, whether the voltage stabilizer fails or not can be determined according to an obtained test result, and detection efficiency of the voltage stabilizer faults is improved.)

1. The fault detection method of the gas supply system is characterized in that the gas supply system comprises a voltage stabilizer, a gas rail and an injection valve, wherein the gas rail is connected with an electronic control unit; the method is applied to the electronic control unit and comprises the following steps:

after the electronic control unit is detected to be powered on and the engine is started, acquiring state parameters of the engine;

judging whether the engine is in a preset injection valve closing working condition or not according to the state parameters;

if the engine is in the preset injection valve closing working condition, acquiring a gas pressure value of a gas rail;

and if the gas pressure value is greater than or equal to a first preset pressure value, sending a fault prompt of the voltage stabilizer to an alarm device.

2. The method of claim 1, wherein after sending the indication that the voltage regulator is malfunctioning to an alarm device, further comprising:

acquiring an air inlet pressure value of the engine;

determining whether the injection valve has abnormal opening fault according to the air inlet pressure value and the gas pressure value;

and if the injection valve has abnormal opening fault, adjusting the gas pressure value of the gas rail.

3. The method of claim 2, wherein said determining whether there is an opening anomaly fault with the injection valve based on the intake pressure value and the combustion gas pressure value comprises:

acquiring a first difference value between the gas pressure value and the air inlet pressure value;

if the first difference value is larger than or equal to a second preset pressure value, determining that the injection valve has an abnormal opening fault;

and if the first difference value is smaller than the second preset pressure value, determining that the injection valve has no abnormal opening fault.

4. The method of claim 2 or 3, wherein the gas supply system further comprises a pressure regulating valve;

adjust the gas pressure value of gas rail includes:

and reducing the gas pressure value of the gas rail through the pressure regulating valve.

5. The method of claim 2, further comprising, after said adjusting the gas pressure value of the gas rail:

acquiring a gas pressure value of a current gas rail to obtain a first gas pressure value, and acquiring an air inlet pressure value of a current engine to obtain a first air inlet pressure value;

calculating a second difference value between the first gas pressure value and the first air inlet pressure value;

and if the second difference value is smaller than or equal to a third preset pressure value, stopping adjusting the gas pressure value of the gas rail.

6. The method of claim 1, wherein the state parameter comprises engine speed;

the judging whether the engine is in a preset injection valve closing working condition or not according to the state parameters comprises the following steps:

acquiring the opening degree of an accelerator pedal, and detecting whether the engine has a required torque;

and if the opening degree of the accelerator pedal is smaller than a preset opening value, the engine does not have the required torque, and the engine rotating speed is larger than a preset rotating speed, determining that the engine is in the closing working condition of the preset injection valve.

7. The fault detection device of the gas supply system is characterized in that the gas supply system comprises a voltage stabilizer, a gas rail and an injection valve, wherein the gas rail is connected with an electronic control unit; the device is applied to the electronic control unit and comprises:

the state parameter acquisition module is used for acquiring the state parameters of the engine after detecting that the electronic control unit is electrified and the engine is started;

the engine working condition detection module is used for judging whether the engine is in a preset injection valve closing working condition or not according to the state parameters;

the gas pressure value acquisition module is used for acquiring a gas pressure value of a gas rail if the engine is in the closing working condition of the preset injection valve;

and the fault processing module is used for sending a fault prompt of the voltage stabilizer to an alarm device if the gas pressure value is greater than or equal to a first preset pressure value.

8. The apparatus of claim 7, further comprising an injection valve failure detection module;

the injection valve fault detection module is used for acquiring the air inlet pressure value of the engine after sending the fault prompt of the voltage stabilizer to the alarm device;

determining whether the injection valve has abnormal opening fault according to the air inlet pressure value and the gas pressure value;

and if the injection valve has abnormal opening fault, adjusting the gas pressure value of the gas rail.

9. An electronic control unit, comprising: at least one processor and memory;

the memory stores computer-executable instructions;

the at least one processor executing the computer-executable instructions stored by the memory causes the at least one processor to perform the method of fault detection for an air supply system of any of claims 1 to 6.

10. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored therein computer-executable instructions that, when executed by a processor, implement the method for detecting a failure of an air supply system according to any one of claims 1 to 6.

Technical Field

The embodiment of the invention relates to the technical field of vehicles, in particular to a fault detection method and device for an air supply system and an electronic control unit.

Background

The gas supply device of the natural gas engine is composed of a gas tank, a gas cut-off valve, a pressure stabilizer gas supply pipeline, a gas rail, an injection valve and the like (as shown in figure 1), wherein the pressure stabilizer is a mechanical structural member and is used for controlling the flow of gas entering the gas rail so as to adjust the gas pressure in the gas rail. When the stabiliser breaks down, the entering volume of the gas that gets into the gas rail can't be controlled to the stabiliser, and the gas pressure in the gas rail probably appears too high or the low problem of crossing to lead to engine power not enough, the unable normal driving of vehicle. Therefore, in order to avoid the vehicle from being unable to run normally due to the failure of the regulator, it is necessary to perform failure detection on the regulator.

Disclosure of Invention

The embodiment of the invention provides a fault detection method and device for an air supply system and an electronic control unit, and aims to solve the problem of low fault detection efficiency in a mode of manually detecting whether a voltage stabilizer has a fault in the prior art.

In a first aspect, an embodiment of the present invention provides a fault detection method for an air supply system, where the air supply system includes a voltage stabilizer, a gas rail, and an injection valve, and the gas rail is connected to an electronic control unit; the method is applied to the electronic control unit and comprises the following steps:

after the electronic control unit is detected to be powered on and the engine is started, acquiring state parameters of the engine;

judging whether the engine is in a preset injection valve closing working condition or not according to the state parameters;

if the engine is in the preset injection valve closing working condition, acquiring a gas pressure value of a gas rail;

and if the gas pressure value is greater than or equal to a first preset pressure value, sending a fault prompt of the voltage stabilizer to an alarm device.

In one possible design, after sending the indication that the voltage regulator has the fault to the alarm device, the method further includes:

acquiring an air inlet pressure value of the engine;

determining whether the injection valve has abnormal opening fault according to the air inlet pressure value and the gas pressure value;

and if the injection valve has abnormal opening fault, adjusting the gas pressure value of the gas rail.

In one possible design, the determining whether there is an abnormal opening fault of the injection valve according to the intake pressure value and the gas pressure value includes:

acquiring a first difference value between the gas pressure value and the air inlet pressure value;

if the first difference value is larger than or equal to a second preset pressure value, determining that the injection valve has an abnormal opening fault;

and if the first difference value is smaller than the second preset pressure value, determining that the injection valve has no abnormal opening fault.

In one possible design, the gas supply system further comprises a pressure regulating valve;

adjust the gas pressure value of gas rail includes:

and reducing the gas pressure value of the gas rail through the pressure regulating valve.

In one possible design, after the adjusting the gas pressure value of the gas rail, the method further includes:

acquiring a gas pressure value of a current gas rail to obtain a first gas pressure value, and acquiring an air inlet pressure value of a current engine to obtain a first air inlet pressure value;

calculating a second difference value between the first gas pressure value and the first air inlet pressure value;

and if the second difference value is smaller than or equal to a third preset pressure value, stopping adjusting the gas pressure value of the gas rail.

In one possible design, the state parameter includes engine speed;

the judging whether the engine is in a preset injection valve closing working condition or not according to the state parameters comprises the following steps:

acquiring the opening degree of an accelerator pedal, and detecting whether the engine has a required torque;

and if the opening degree of the accelerator pedal is smaller than a preset opening value, the engine does not have the required torque, and the engine rotating speed is larger than a preset rotating speed, determining that the engine is in the closing working condition of the preset injection valve.

In a second aspect, an embodiment of the present invention provides a fault detection apparatus for an air supply system, where the air supply system includes a voltage stabilizer, a gas rail, and an injection valve, and the gas rail is connected to an electronic control unit; the device is applied to the electronic control unit and comprises:

the state parameter acquisition module is used for acquiring the state parameters of the engine after detecting that the electronic control unit is electrified and the engine is started;

the engine working condition detection module is used for judging whether the engine is in a preset injection valve closing working condition or not according to the state parameters;

the gas pressure value acquisition module is used for acquiring a gas pressure value of a gas rail if the engine is in the closing working condition of the preset injection valve;

and the fault processing module is used for sending a fault prompt of the voltage stabilizer to an alarm device if the gas pressure value is greater than or equal to a first preset pressure value.

In one possible design, the apparatus further includes an injection valve failure detection module;

the injection valve fault detection module is used for acquiring the air inlet pressure value of the engine after sending the fault prompt of the voltage stabilizer to the alarm device;

determining whether the injection valve has abnormal opening fault according to the air inlet pressure value and the gas pressure value;

and if the injection valve has abnormal opening fault, adjusting the gas pressure value of the gas rail.

In one possible design, the injection valve failure detection module is specifically configured to:

acquiring a first difference value between the gas pressure value and the air inlet pressure value;

if the first difference value is larger than or equal to a second preset pressure value, determining that the injection valve has an abnormal opening fault;

and if the first difference value is smaller than the second preset pressure value, determining that the injection valve has no abnormal opening fault.

In one possible design, the gas supply system further comprises a pressure regulating valve;

the injection valve fault detection module is further specifically configured to:

and reducing the gas pressure value of the gas rail through the pressure regulating valve.

In one possible design, the injection valve failure detection module is further configured to: after the gas pressure value of the gas rail is adjusted, obtaining the gas pressure value of the current gas rail to obtain a first gas pressure value, and obtaining the air inlet pressure value of the current engine to obtain a first air inlet pressure value;

calculating a second difference value between the first gas pressure value and the first air inlet pressure value;

and if the second difference value is smaller than or equal to a third preset pressure value, stopping adjusting the gas pressure value of the gas rail.

In one possible design, the state parameter includes engine speed;

the engine working condition detection module is specifically used for:

acquiring the opening degree of an accelerator pedal, and detecting whether the engine has a required torque;

and if the opening degree of the accelerator pedal is smaller than a preset opening value, the engine does not have the required torque, and the engine rotating speed is larger than a preset rotating speed, determining that the engine is in the closing working condition of the preset injection valve.

In a third aspect, an embodiment of the present invention provides an electronic control unit, including: at least one processor and memory;

the memory stores computer-executable instructions;

the at least one processor executing the computer-executable instructions stored by the memory causes the at least one processor to perform the method of fault detection for an air supply system according to any one of the first aspects.

In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, where a computer executes instructions, and when a processor executes the computer to execute the instructions, the method for detecting a fault of an air supply system according to any one of the first aspect is implemented.

The fault detection method, the fault detection device and the electronic control unit of the gas supply system provided by the embodiment of the invention have the advantages that after the electronic control unit is detected to be electrified and the engine is started, the working condition of the engine is determined according to the state parameters of the engine, when the engine is determined to be in the closing working condition of the preset injection valve, the injection valve is indicated to be in the closing state, whether the fault exists in the voltage stabilizer can be determined according to the gas pressure value of the gas rail, when the gas pressure value is greater than or equal to the first preset pressure value, the fault exists in the voltage stabilizer can be determined, the fault existence prompt of the voltage stabilizer is sent to the alarm device, so that a user can know whether the fault exists in the voltage stabilizer through the alarm device, the fault of the voltage stabilizer is automatically determined by utilizing the gas pressure value of the gas rail, the automatic detection of the, whether the voltage stabilizer has a fault can be determined according to the obtained test result, and the fault detection efficiency of the voltage stabilizer is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an air supply system according to an embodiment of the present invention;

fig. 2 is a schematic view of a fault detection scenario of an air supply system according to an embodiment of the present invention;

fig. 3 is a first flowchart of a method for detecting a fault in an air supply system according to an embodiment of the present invention;

fig. 4 is a second flowchart of a fault detection method of an air supply system according to an embodiment of the present invention;

fig. 5 is a first schematic structural diagram of a fault detection device of an air supply system according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a fault detection device of an air supply system according to an embodiment of the present invention;

fig. 7 is a schematic diagram of a hardware structure of an electronic control unit according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.