CN110657047A - Fault detection method and device for gas supply system and electronic control unit - Google Patents
Fault detection method and device for gas supply system and electronic control unit Download PDFInfo
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- CN110657047A CN110657047A CN201910900338.5A CN201910900338A CN110657047A CN 110657047 A CN110657047 A CN 110657047A CN 201910900338 A CN201910900338 A CN 201910900338A CN 110657047 A CN110657047 A CN 110657047A
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- pressure value
- gas
- engine
- injection valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0293—Safety devices; Fail-safe measures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0027—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures the fuel being gaseous
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/023—Valves; Pressure or flow regulators in the fuel supply or return system
- F02M21/0239—Pressure or flow regulators therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0248—Injectors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D2041/228—Warning displays
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/60—Input parameters for engine control said parameters being related to the driver demands or status
- F02D2200/602—Pedal position
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
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.
Description
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.
In the prior art, when fault detection is performed on a voltage stabilizer, generally, a related maintenance worker performs a specific test operation on a vehicle to obtain a corresponding test result, and whether the voltage stabilizer has a fault is determined according to the test result.
However, the inventors found that at least the following problems exist in the prior art: after some test operations are performed on the vehicle by maintenance personnel, whether the voltage stabilizer has a fault or not can be determined according to the obtained test result, and the fault detection efficiency is low.
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.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 2 is a schematic view of a fault detection scenario of an air supply system according to an embodiment of the present invention, and as shown in fig. 2, an Electronic Control Unit 101(Electronic Control Unit, abbreviated as ECU) is connected to a gas rail in the air supply system. The gas supply system 102 includes a gas tank, a shut-off valve, a pressure stabilizer, a gas supply pipeline, a gas rail, an injection valve, and the like, the gas tank is connected with the gas rail through the gas supply pipeline, and the shut-off valve, the pressure stabilizer, and the pressure regulating valve are sequentially disposed on the gas supply pipeline, as can be seen from fig. 1, the gas supply system provided by the embodiment of the present invention, that is, the gas supply system 102 in fig. 2, has a similar structure to the existing gas supply system, and only one pressure regulating valve is added on the gas supply pipeline.
When confirming whether the stabiliser in the air supply system has the trouble, the electronic control unit needs to confirm whether can carry out fault detection according to some parameters earlier, when confirming can carry out fault detection, acquires the gas pressure value of gas rail, whether has the trouble according to the gas pressure value automatic determination stabiliser of gas rail, realizes the automated inspection of stabiliser trouble, need not artifical and carry out specific test operation to the vehicle after, just can confirm whether have the trouble according to the test result that obtains, improves the detection efficiency of stabiliser trouble.
It can be understood that the electronic control unit is connected with the gas rail, actually connected with a gas pressure sensor in the gas rail, and when the gas pressure value of the gas rail needs to be obtained, the pressure signal collected by the gas pressure sensor is obtained, and the corresponding gas pressure value is obtained according to the pressure information.
Because the pressure regulating valve is not needed to be used when the fault detection is carried out on the voltage stabilizer, the fault detection method of the voltage stabilizer provided by the implementation can also carry out the fault detection on the voltage stabilizer in the existing gas supply system, namely the gas supply system does not comprise the pressure regulating valve. The technical solution of the present invention will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Fig. 3 is a first flowchart of a method for detecting a fault of an air supply system according to an embodiment of the present invention, where the air supply system includes a regulator, a gas rail, and an injection valve, the gas rail is connected to an electronic control unit, and the method of this embodiment is applied to the electronic control unit, that is, an execution subject of the method of this embodiment may be the electronic control unit in fig. 2, as shown in fig. 3, the method of this embodiment may include:
s301: and acquiring the state parameters of the engine after detecting that the electronic control unit is electrified and the engine is started.
In this embodiment, the electronic control unit is powered on to start the engine, and when the electronic control unit determines that the electronic control unit is powered on and starts the engine, the state parameter of the engine is obtained, and the working condition of the engine can be determined according to the state parameter of the engine.
Wherein the state parameter of the engine comprises an engine speed.
S302: and judging whether the engine is in a preset injection valve closing working condition or not according to the state parameters.
In this embodiment, after obtaining the state parameter, it may be determined whether the engine is in the preset injection valve closing condition according to the state parameter. The injection valve is in a closed state when the engine is in a preset injection valve closing condition, which may be an overhun condition.
In order to improve the accuracy of judging the working condition of the engine, when determining whether the working condition of the engine is the preset injection valve closing working condition, namely when determining whether the engine is in the preset injection valve closing working condition, the method can also utilize the opening degree of an accelerator pedal and the engine to determine whether the engine is in the preset injection valve closing working condition or not, and the determination process comprises the following steps: and acquiring the opening degree of an accelerator pedal, and detecting whether the engine has the required torque. And if the opening degree of the accelerator pedal is smaller than a preset opening degree value, the engine does not have the required torque, and the engine rotating speed is larger than the preset rotating speed, determining that the engine is in a preset injection valve closing working condition.
In the present embodiment, when the accelerator pedal opening is smaller than the preset opening value, it indicates that the accelerator pedal is in a released state.
The method comprises the steps of obtaining the opening degree of an accelerator pedal of a vehicle and detecting whether a required torque exists in an engine, and when the opening degree of the accelerator pedal is smaller than a preset opening degree value, the required torque does not exist in the engine and the rotating speed of the engine is larger than a preset rotating speed, determining that the working condition of the engine is an over working condition.
In the prior art, there are many mature methods for detecting the required torque of the engine, which can be used to detect whether the engine has the required torque, and the process of detecting whether the engine has the required torque is not described herein again.
When the opening degree of the accelerator pedal is larger than or equal to a preset opening value, the engine has required torque and/or the engine speed is smaller than a preset rotating speed, the engine is determined not to be in a preset injection valve closing working condition, namely, the condition for fault detection of the voltage stabilizer is not met, after a certain time interval, the working condition of the engine is re-determined, and whether the condition for fault detection of the voltage stabilizer is met is judged.
S303: and if the engine is in a preset closing working condition of the injection valve, acquiring the gas pressure value of the gas rail.
In the embodiment, when the engine is in the preset injection valve closing working condition, the injection valve is in the stop injection state, in order to prevent the gas pressure of the gas rail from increasing suddenly, the voltage stabilizer can carry out self-locking so as to keep the gas pressure of the gas rail within a reasonable range, but if the voltage stabilizer fails, the self-locking function can not be realized any more, and the gas pressure of the gas rail can be increased suddenly, so that when the engine is determined to be in the closing working condition of the preset injection valve, indicating that the current condition for fault detection of the voltage stabilizer is met, starting to acquire the gas pressure value of the gas rail, judging whether the gas pressure value is greater than or equal to a first preset pressure value, if the gas pressure value is greater than or equal to the first preset pressure value, indicating that the injection valve stops injecting, the gas pressure value of the gas rail is too high, and the voltage stabilizer is not self-locked, so that the fault of the voltage stabilizer can be determined.
Optionally, because the engine is just in when presetting the injection valve and closing the operating mode, the gas pressure value of gas rail just can have certain fluctuation itself, in order to avoid erroneous judgement, when confirming that the engine is in and presets the injection valve and closing the operating mode, after the time interval that predetermines, reacquires the gas pressure value of gas rail again to can improve follow-up accuracy of whether having the trouble according to the gas pressure value determination stabiliser, improve stabiliser fault detection's accuracy promptly.
S304: if the gas pressure value is larger than or equal to the first preset pressure value, the fault prompt of the voltage stabilizer is sent to the alarm device.
In this embodiment, when the gas pressure value is greater than or equal to a first preset pressure value, it is determined that the voltage stabilizer has a fault, the gas pressure of the gas rail cannot be adjusted through self-locking, and a fault prompt of the voltage stabilizer is generated and sent to the alarm device, so that the alarm device plays or displays the fault prompt, and a user can know that the voltage stabilizer has the fault.
Wherein, the alarm device can be a display screen or a voice player on the vehicle.
It can be understood that the electronic control unit may obtain parameters of a plurality of devices on the vehicle, for example, state parameters of the engine and a gas pressure value of the gas rail, and when it is necessary to determine whether the vehicle is in a preset injection valve closing condition, obtain the state parameters of the relevant engine, and when it is necessary to detect whether the voltage stabilizer has a fault, obtain the gas pressure value of the gas rail.
From the above description, it can be known that, after the electronic control unit is detected to be powered on 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 preset injection valve closing working condition, 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, a prompt that the fault exists in the voltage stabilizer is sent to the alarm device, so that a user can know that the fault exists in the voltage stabilizer through the alarm device, whether the fault exists in the voltage stabilizer can be automatically determined by using the gas pressure value of the gas rail, the fault of the voltage stabilizer can be automatically detected, and after the vehicle is not required, the detection efficiency of the faults of the voltage stabilizer is improved.
It is understood that, in order to avoid the abnormal opening fault of the injection valve due to the failure of the pressure stabilizer, the above steps of this embodiment may further include a step of detecting whether the abnormal opening fault of the injector exists, and the process of detecting whether the abnormal opening fault of the injector exists will be described in detail below with reference to a specific embodiment.
Fig. 4 is a second flowchart of a failure detection method of an air supply system according to an embodiment of the present invention, as shown in fig. 4, a process of detecting whether there is an abnormal opening failure of an injector is described in detail on the basis of the above embodiment, where the method of this embodiment includes:
s401: and acquiring the state parameters of the engine after detecting that the electronic control unit is electrified and the engine is started.
S402: and judging whether the engine is in a preset injection valve closing working condition or not according to the state parameters.
S403: and if the engine is in a preset closing working condition of the injection valve, acquiring the gas pressure value of the gas rail.
S404: if the gas pressure value is larger than or equal to the first preset pressure value, the fault prompt of the voltage stabilizer is sent to the alarm device.
The processes of S401 to S404 are similar to S301 to S304 in the embodiment of fig. 3, and are not described again here.
S405: and acquiring an intake pressure value of the engine.
In this embodiment, the intake pressure value of the engine refers to a rear intake pressure value of a throttle valve, and actually refers to an absolute pressure of an intake manifold behind the throttle valve, and the throttle valve is a controllable valve for controlling air to enter the engine, and mainly functions to control a flow rate of air or air mixture entering the engine.
The intake pressure sensor detects the absolute pressure of an intake manifold behind the throttle valve, generates a corresponding pressure signal, and sends the pressure signal to the electronic control unit, so that the electronic control unit determines an intake pressure value corresponding to the pressure signal.
S406: and determining whether the injection valve has abnormal opening fault according to the air inlet pressure value and the gas pressure value.
In this embodiment, when the electronic control unit opens the injection valve, the injection valve needs to satisfy two opening conditions, the first opening condition is that a related driving request needs to be provided, the second opening condition is that a difference value between a gas pressure value and an intake pressure value of the engine needs to be smaller than a certain value, when the gas pressure value is too high, the difference value between the gas pressure value and the intake pressure value is too high, and the second opening condition cannot be satisfied, so that even if the first opening adjustment is satisfied, the injector cannot be normally opened, and the engine has problems of abnormal flameout, unable start, and the like, which brings a safety risk to a user, therefore, when the injection valve already satisfies the first opening condition, it needs to determine whether the injection valve satisfies the second opening condition according to the intake pressure value and the gas pressure value, so as to determine whether the injection valve can be normally opened, i.e. whether there is an opening anomaly fault.
Optionally, when the intake pressure value of the engine is obtained, the gas pressure value of the gas rail at that time may be obtained again to obtain the latest gas pressure value, and accordingly, when it is determined whether the injection valve has an abnormal opening fault according to the gas pressure value and the intake pressure value, the latest gas pressure value and the intake pressure value are used for determination.
Wherein, confirm whether injection valve has opening unusual trouble according to gas pressure value and intake pressure value, include:
acquiring a first difference value between a gas pressure value and an air inlet pressure value;
and if the first difference value is larger than or equal to the 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 this embodiment, when determining whether the injection valve satisfies the second opening condition, a difference between the gas pressure value and the intake pressure value is calculated, that is, the gas pressure value is subtracted from the intake pressure value to obtain a first difference. If the first difference value is larger than or equal to the second preset pressure value, the gas pressure value of the gas rail is over high, the injection valve does not meet the second opening condition, and therefore the injector cannot be normally opened, namely, an abnormal opening fault exists. If the first difference value is smaller than the second preset pressure value, the injection valve meets the second opening condition, and the injection valve can be normally opened, namely, the abnormal opening fault does not exist.
S407: and if the injection valve has abnormal opening fault, adjusting the gas pressure value of the gas rail.
Optionally, the air supply system further comprises a pressure regulating valve.
Adjust the gas pressure value of gas rail, include:
the gas pressure value of the gas rail is reduced through the pressure regulating valve.
In this embodiment, when it is determined that there is an abnormal opening failure of the injection valve, it may be determined that the gas pressure value of the gas rail is too high, and therefore, it is necessary to adjust the gas pressure of the gas rail to reduce the gas pressure of the gas rail. Therefore, the injection valve can meet the second opening condition and can be normally opened, and the problems that the engine is abnormally shut down, cannot be started and the like due to the fact that the injection valve cannot be normally opened can be avoided.
When the gas pressure of the gas rail is adjusted, the adjustment can be performed through the additional pressure regulating valve between the gas rail and the voltage stabilizer, for example, the pressure is released through the pressure regulating valve in fig. 2, so that the gas pressure of the gas rail is reduced.
In the process of adjusting the gas pressure of the gas rail, it is necessary to determine whether the adjustment operation can be stopped, and the specific determination process is: 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 the third preset pressure value, stopping adjusting the gas pressure value of the gas rail.
In this embodiment, in the process of adjusting the gas pressure of the gas rail, a gas pressure value of the current gas rail is obtained, a first gas pressure value is obtained, an intake pressure value of the current engine is obtained, a first intake pressure value is obtained, the first gas pressure value is subtracted from the first intake pressure value, a second difference value is obtained, if the second difference value is smaller than or equal to a third preset pressure value, it indicates that the gas pressure of the current gas rail can meet the requirement, that is, the injection valve can meet the second condition, and no further adjustment is needed, the adjustment of the gas pressure value of the gas rail is stopped, if the second difference value is greater than the third preset pressure value, it indicates that the gas pressure of the gas rail is still higher, the pressure difference between the gas pressure and the intake pressure is still greater, and the gas pressure value of the gas rail needs to be continuously reduced, the gas pressure value of the gas rail is continuously adjusted, and after a certain time interval, re-determining whether the adjustment operation can be stopped.
In the embodiment, when the voltage stabilizer fails, the gas pressure value of the gas rail can be caused to be too high, thereby causing the difference between the gas pressure value and the air inlet pressure value to be overlarge, and causing the abnormal opening obstacle of the injection valve when the difference between the gas pressure value and the air inlet pressure value is overlarge, namely, the injection valve can not be normally opened, therefore, the gas pressure of the gas rail needs to be reduced, after the gas pressure of the gas rail is reduced, the difference value between the gas pressure value and the air inlet pressure value is correspondingly reduced, thereby the injector can be normally opened, the normal starting and running of the engine can be ensured in a short time, and can make things convenient for the vehicle to drive near service station and maintain, avoid appearing because the too big injection valve that leads to of the difference between gas pressure value and the pressure value of admitting air can't normally open to cause the unable problem that starts and flame-out of engine.
Fig. 5 is a schematic structural diagram of a fault detection apparatus of an air supply system according to an embodiment of the present invention, 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 apparatus is applied to an electronic control unit, and as shown in fig. 5, the fault detection apparatus 500 of the air supply system provided in this embodiment may include: the system comprises a state parameter acquisition module 501, an engine working condition detection module 502, a gas pressure value acquisition module 503 and a fault processing module 504.
In one possible design, the state parameter includes engine speed.
The engine working condition detection module is specifically used for:
and acquiring the opening degree of an accelerator pedal, and detecting whether the engine has the required torque.
And if the opening degree of the accelerator pedal is smaller than a preset opening degree value, the engine does not have the required torque, and the engine rotating speed is larger than the preset rotating speed, determining that the engine is in a preset injection valve closing working condition.
The fault detection device of the air supply system provided by the embodiment of the invention can realize the fault detection method of the air supply system shown in the embodiment of fig. 2, and the realization principle and the technical effect are similar, and are not described again here.
Fig. 6 is a schematic structural diagram of a second fault detection device of an air supply system according to an embodiment of the present invention, as shown in fig. 6, based on the foregoing device embodiment, the fault detection device of the air supply system according to the embodiment of the present invention may further include: the injection valve failure detection module 505.
The injection valve fault detection module is used for obtaining the air inlet pressure value of the engine after sending the fault prompt of the voltage stabilizer to the alarm device.
And 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:
and acquiring a first difference value between the gas pressure value and the air inlet pressure value.
And if the first difference value is larger than or equal to the 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:
the gas pressure value of the gas rail is reduced through the pressure regulating valve.
In one possible design, the injection valve fault detection module is further configured to: after the gas pressure value of the gas rail is adjusted, the gas pressure value of the current gas rail is obtained, a first gas pressure value is obtained, the air inlet pressure value of the current engine is obtained, and a first air inlet pressure value is obtained.
And 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 the third preset pressure value, stopping adjusting the gas pressure value of the gas rail.
The fault detection device of the air supply system provided by the embodiment of the invention can realize the fault detection method of the air supply system shown in the embodiment shown in fig. 3, and the realization principle and the technical effect are similar, and are not described again here.
Fig. 7 is a schematic diagram of a hardware structure of an electronic control unit according to an embodiment of the present invention. As shown in fig. 7, the electronic control unit 700 provided in the present embodiment includes: at least one processor 701 and a memory 702. The processor 701 and the memory 702 are connected by a bus 703.
In a specific implementation process, the at least one processor 701 executes the computer-executable instructions stored in the memory 702, so that the at least one processor 701 executes the fault detection method of the air supply system in the above method embodiment.
For a specific implementation process of the processor 701, reference may be made to the above method embodiments, which implement principles and technical effects similar to each other, and details of this embodiment are not described herein again.
In the embodiment shown in fig. 7, it should be understood that the Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the present invention may be embodied directly in a hardware processor, or in a combination of the hardware and software modules within the processor.
The memory may comprise high speed RAM memory and may also include non-volatile storage NVM, such as at least one disk memory.
The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, the buses in the figures of the present application are not limited to only one bus or one type of bus.
Alternatively, the bus 703 may be a CAN line.
The embodiment of the invention also provides a computer-readable storage medium, wherein a computer executing instruction is stored in the computer-readable storage medium, and when a processor executes the computer executing instruction, the fault detection method of the air supply system of the embodiment of the method is realized.
The computer-readable storage medium may be implemented by any type of volatile or non-volatile memory device or combination thereof, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disk. Readable storage media can be any available media that can be accessed by a general purpose or special purpose computer.
An exemplary readable storage medium is coupled to the processor such the processor can read information from, and write information to, the readable storage medium. Of course, the readable storage medium may also be an integral part of the processor. The processor and the readable storage medium may reside in an Application Specific Integrated Circuits (ASIC). Of course, the processor and the readable storage medium may also reside as discrete components in the apparatus.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
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.
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