CN115075989B - Pulse secondary air injection system, fault detection method and device thereof and vehicle - Google Patents
Pulse secondary air injection system, fault detection method and device thereof and vehicle Download PDFInfo
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- CN115075989B CN115075989B CN202111413816.3A CN202111413816A CN115075989B CN 115075989 B CN115075989 B CN 115075989B CN 202111413816 A CN202111413816 A CN 202111413816A CN 115075989 B CN115075989 B CN 115075989B
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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
- F02M23/00—Apparatus for adding secondary air to fuel-air mixture
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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
- F02D41/0002—Controlling intake air
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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
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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
- F02M23/00—Apparatus for adding secondary air to fuel-air mixture
- F02M23/006—Valves specially shaped for supplying secondary air
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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
- F02M23/00—Apparatus for adding secondary air to fuel-air mixture
- F02M23/04—Apparatus for adding secondary air to fuel-air mixture with automatic control
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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Abstract
The invention provides a pulse secondary air injection system, a fault detection method and device thereof and a vehicle, wherein the method comprises the following steps: when the engine is determined to be in a preset working condition, controlling the engine to enter a closed-loop control mode; under a closed-loop control mode, acquiring a first closed-loop adjustment factor and controlling a control valve of a pulse secondary air injection system to be opened; after the control valve is opened, a second closed-loop adjustment factor is obtained; and performing fault detection on the control valve according to the first closed-loop adjustment factor and the second closed-loop adjustment factor. According to the invention, under the closed-loop control mode, the first closed-loop adjustment factor is obtained, the control valve of the pulse secondary air injection system is controlled to be opened, the second closed-loop adjustment factor is obtained after the control valve is opened, and the control valve is subjected to fault detection according to the first closed-loop adjustment factor and the second closed-loop adjustment factor, so that a device is not required to be added independently, and the cost of the whole vehicle is reduced while the installation difficulty is reduced.
Description
Technical Field
The invention relates to the technical field of motorcycles, in particular to a pulse secondary air injection system, a fault detection method and device thereof and a vehicle.
Background
Compared with the fourth generation standard of the European automobile exhaust emission, the fifth generation standard of the European automobile exhaust emission (OBD (On-Board Diagnostics, on-board self-diagnosis system) content increases some exhaust emission requirements, wherein new diagnosis requirements are added for devices such as a carbon tank, a secondary air injection system and the like. Among them, the secondary air injection system is an important emission technique of a motorcycle, which essentially introduces a certain amount of fresh air into an exhaust pipe or a three-way catalytic converter to further combust harmful gas in exhaust gas with air, thereby reducing the emission of harmful substances. The secondary air injection system may reduce emissions of HC (hydrocarbons) and CO (carbon monoxide) when the engine is at normal operating temperatures. When the engine is just started, the secondary air injection system can reduce the emission of HC, shorten the heating time of the oxygen sensor and enable the engine control module to enter the air-fuel ratio closed-loop control process as soon as possible.
The secondary air injection system is divided into two types according to a power driving mode, wherein one type is an active pump type secondary air injection system, and the other type is an pulsed type secondary air injection system. Among them, motorcycles generally employ an pulsed secondary air injection system, and passenger cars mostly employ an active pump secondary air injection system. When the fault of the secondary air injection system is monitored due to European V standard requirements of the motorcycle, a diagnosis scheme aiming at the pulse secondary air injection system is required to be developed in order to ensure that the developed vehicle meets the European V standard monitoring requirements.
However, there is no diagnostic solution for the pulsed secondary air injection system at present, and if the same diagnostic solution as the active pump secondary air injection system is adopted, a pressure sensor needs to be added, and because of the compact layout of the motorcycle, if the pressure sensor is added to the motorcycle, not only the installation difficulty is increased, but also the cost of the whole motorcycle is increased.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art.
Therefore, a first object of the present invention is to provide a fault detection method for a pulsed secondary air injection system, in which a first closed-loop adjustment factor is obtained and a control valve of the pulsed secondary air injection system is controlled to be opened in a closed-loop control mode, and a second closed-loop adjustment factor is obtained after the control valve is opened and the control valve is subjected to fault detection according to the first closed-loop adjustment factor and the second closed-loop adjustment factor, so that no separate device is required, and the installation difficulty is reduced and the cost of the whole vehicle is reduced.
To this end, a second object of the present invention is to propose a failure detection device of a pulsed secondary air injection system.
To this end, a third object of the present invention is to propose a pulsed secondary air injection system.
To this end, a fourth object of the invention is to propose a vehicle.
To this end, a fifth object of the present invention is to propose a computer readable storage medium.
In order to achieve the above object, an embodiment of a first aspect of the present invention proposes a failure detection method of a pulsed secondary air injection system, the method comprising: when the engine is determined to be in a preset working condition, controlling the engine to enter a closed-loop control mode; under the closed-loop control mode, acquiring a first closed-loop adjustment factor and controlling a control valve of a pulse secondary air injection system to be opened; after the control valve is opened, a second closed-loop adjustment factor is obtained; and detecting faults of the control valve according to the first closed-loop adjustment factor and the second closed-loop adjustment factor.
According to the fault detection method of the pulse secondary air injection system, the first closed-loop adjusting factor is obtained in the closed-loop control mode, the control valve of the pulse secondary air injection system is controlled to be opened, the second closed-loop adjusting factor is obtained after the control valve is opened, and the fault detection is carried out on the control valve according to the first closed-loop adjusting factor and the second closed-loop adjusting factor, so that devices are not required to be added independently, the installation difficulty is reduced, and meanwhile the cost of the whole air is reduced.
In some embodiments, the fault detection of the control valve based on the first closed-loop adjustment factor and the second closed-loop adjustment factor comprises: calculating a difference between the first closed loop adjustment factor and the second closed loop adjustment factor; if the difference value is larger than a preset threshold value, determining that the control valve is normal, otherwise, determining that the control valve is faulty.
In some embodiments, after the obtaining the first closed loop adjustment factor, further comprises: and sending an instruction for controlling the control valve to be opened.
In some embodiments, after the obtaining the second closed loop adjustment factor, further comprising: and sending an instruction for controlling the control valve to be closed.
In some embodiments, prior to obtaining the second closed loop adjustment factor, further comprising: and after the control valve is opened, if the closed-loop adjustment factor is unchanged, taking the closed-loop adjustment factor as the second closed-loop adjustment factor.
In some embodiments, determining that the engine is in a preset operating condition includes: and determining that the engine is in an idle working condition or a small load working condition.
To achieve the above object, an embodiment of a second aspect of the present invention provides a malfunction detection device for a pulsed secondary air injection system, the device including: the first control module is used for controlling the engine to enter a closed-loop control mode when the engine is determined to be in a preset working condition; the second control module is used for acquiring a first closed-loop adjusting factor and controlling a control valve of the pulse secondary air injection system to be opened under the closed-loop control mode; the acquisition module is used for acquiring a second closed-loop adjustment factor after the control valve is opened; and the detection module is used for detecting faults of the control valve according to the first closed-loop adjustment factor and the second closed-loop adjustment factor.
According to the fault detection device of the pulse secondary air injection system, the first closed-loop adjusting factor is obtained in the closed-loop control mode, the control valve of the pulse secondary air injection system is controlled to be opened, and the second closed-loop adjusting factor is obtained after the control valve is opened, so that the fault detection is carried out on the control valve according to the first closed-loop adjusting factor and the second closed-loop adjusting factor, devices are not required to be added independently, and the whole vehicle cost is reduced while the installation difficulty is reduced.
To achieve the above object, an embodiment of a third aspect of the invention proposes a pulsed secondary air injection system that includes the failure detection device of the pulsed secondary air injection system of the above embodiment.
According to the pulse secondary air injection system provided by the embodiment of the invention, the first closed-loop adjusting factor is acquired in the closed-loop control mode, the control valve of the pulse secondary air injection system is controlled to be opened, and the second closed-loop adjusting factor is acquired after the control valve is opened, so that the control valve is subjected to fault detection according to the first closed-loop adjusting factor and the second closed-loop adjusting factor, and therefore, no separate device is required, the installation difficulty is reduced, and the cost of the whole vehicle is reduced.
To achieve the above object, an embodiment of a fourth aspect of the invention proposes a vehicle including the pulsed secondary air injection system of the above embodiment.
According to the vehicle disclosed by the embodiment of the invention, the first closed-loop adjusting factor is obtained in the closed-loop control mode, the control valve of the pulse secondary air injection system is controlled to be opened, and the second closed-loop adjusting factor is obtained after the control valve is opened, so that the control valve is subjected to fault detection according to the first closed-loop adjusting factor and the second closed-loop adjusting factor, and therefore, a device is not required to be added independently, the installation difficulty is reduced, and the cost of the whole vehicle is reduced.
To achieve the above object, an embodiment of a fifth aspect of the invention proposes a computer-readable storage medium having stored thereon a failure detection program of a pulsed secondary air injection system, which when executed by a processor, implements the failure detection method of a pulsed secondary air injection system as described in the above embodiment.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a flow chart of a method of fault detection for a pulsed secondary air injection system according to one embodiment of the present invention;
FIG. 2 is a schematic structural view of a pulsed secondary air injection system according to one embodiment of the invention;
FIG. 3 is a schematic diagram of closed loop adjustment factor variation according to one embodiment of the invention;
FIG. 4 is a schematic diagram of a fault detection architecture of a pulsed secondary air injection system according to one embodiment of the present disclosure;
FIG. 5 is a flow chart of a method of fault detection for a pulsed secondary air injection system according to one particular embodiment of the present invention;
FIG. 6 is a block diagram of a fault detection device of a pulsed secondary air injection system according to one embodiment of the present invention;
FIG. 7 is a block diagram of a pulsed secondary air injection system according to one embodiment of the invention;
fig. 8 is a block diagram of a vehicle according to one embodiment of the invention.
Detailed Description
Embodiments of the present invention will be described in detail below, by way of example with reference to the accompanying drawings.
In embodiments where the pulsed secondary air injection system does not require a power source to inject air, it relies on the pressure differential between the atmospheric pressure and the exhaust vacuum pulse to force the air into the exhaust passage, it has been found that each time the exhaust valve is closed, there is a short period of time during which the air pressure in the exhaust port and exhaust pipe is below atmospheric pressure, i.e., a negative vacuum pulse is generated. While the primary control component of the pulsed secondary air injection system is the control valve. Thus, detecting the injection system, i.e., monitoring for a failure of the control valve, may result in the pulsed secondary air injection system not being operated if the control valve is not operating or is not present. Therefore, the monitoring object is determined to be a control valve, the control valve is an electromagnetic valve, the control valve fails, for example, the control valve is stuck normally open, or the control valve is stuck closed, and the failure of the control valve is detected in the working process of the pulse secondary air injection system.
The following describes a failure detection method of the pulsed secondary air injection system of the embodiment of the invention.
The following describes a failure detection method of a pulsed secondary air injection system according to an embodiment of the present invention with reference to fig. 1 to 5, and as shown in fig. 1, the failure detection method of a pulsed secondary air injection system according to an embodiment of the present invention at least includes steps S1 to S4.
And S1, when the engine is determined to be in a preset working condition, controlling the engine to enter a closed-loop control mode.
In the closed-loop control mode, a certain proportional relationship exists between the air quantity in the pulse secondary air injection system and the fuel injection quantity injected into the cylinder. When the pulse secondary air injection system works, air enters the pulse secondary air injection system, the oxygen sensor detects that the content of oxygen in the air changes, and at the moment, the fuel injection quantity injected into the cylinder needs to be adjusted so that a certain proportional relation exists between the air quantity in the pulse secondary air injection system and the fuel injection quantity injected into the cylinder.
In an embodiment, when the engine is in a preset working condition, for example, the engine is in an idle working condition or a small load working condition, the conditions such as the rotation speed and the load of the engine are considered to meet the enabling conditions, and at this time, the engine is controlled to enter a closed-loop control mode so as to correspondingly control the fuel injection quantity injected into the cylinder.
And step S2, acquiring a first closed-loop adjustment factor in a closed-loop control mode, and controlling a control valve of the pulse secondary air injection system to be opened.
The closed-loop adjustment factor has a certain corresponding relation with the fuel injection quantity injected into the cylinder, and it can be understood that the larger the closed-loop adjustment factor is, the more the fuel injection quantity injected into the cylinder is.
In an embodiment, in a closed-loop control mode, a first closed-loop adjustment factor is obtained and a current closed-loop adjustment factor is recorded, and a control valve of the pulsed secondary air injection system is controlled to open, after which air is injected upstream from an oxygen sensor. Specifically, as shown in fig. 2, a schematic structural diagram of a pulse secondary air injection system according to an embodiment of the present invention is shown. After the first closed-loop adjustment factor is obtained, a control valve of the pulsed secondary air injection system is controlled to open such that air enters upstream of the oxygen sensor through the control valve and the check valve.
And S3, after the control valve is opened, acquiring a second closed-loop adjustment factor.
In an embodiment, after the control valve is opened, air enters the upstream of the oxygen sensor, at this time, a second closed-loop adjustment factor is acquired, and the second closed-loop adjustment factor is recorded, so that fault detection is performed on the control method according to the first closed-loop adjustment factor and the second closed-loop adjustment factor.
And S4, performing fault detection on the control valve according to the first closed-loop adjustment factor and the second closed-loop adjustment factor.
In an embodiment, the first closed-loop adjustment factor and the second closed-loop adjustment factor are closed-loop adjustment factors of the pulsed secondary air injection system before and after the control valve is opened, and it can be understood that when the pulsed secondary air injection system works, if the control valve fails, air cannot enter the upstream of the oxygen sensor through the control valve after the control valve of the pulsed secondary air injection system is opened, the oxygen sensor cannot detect that the oxygen content in the air changes, and naturally, the second closed-loop adjustment factor cannot change. If the closed loop adjustment factor does not change, the amount of fuel injected into the cylinder does not change, and thus the air-fuel ratio detected by the oxygen sensor does not change. The fault of the control valve is detected by detecting two closed-loop adjusting factors, and devices are not required to be added independently, so that the mounting difficulty is reduced, and meanwhile, the cost of the whole automobile is reduced.
According to the fault detection method of the pulse secondary air injection system, the first closed-loop adjusting factor is obtained in the closed-loop control mode, the control valve of the pulse secondary air injection system is controlled to be opened, the second closed-loop adjusting factor is obtained after the control valve is opened, and the fault detection is carried out on the control valve according to the first closed-loop adjusting factor and the second closed-loop adjusting factor, so that devices are not required to be added independently, the installation difficulty is reduced, and meanwhile the cost of the whole air is reduced.
In some embodiments, fault detection of the control valve based on the first closed loop adjustment factor and the second closed loop adjustment factor includes: calculating a difference between the first closed loop adjustment factor and the second closed loop adjustment factor; if the difference value is larger than the preset threshold value, the control valve is determined to be normal, otherwise, the control valve is determined to be faulty.
In the embodiment, when the pulse secondary air injection system works, an ECU (Electronic Control Unit, an electronic controller unit) controls an engine to enter a closed-loop control mode, in the mode, after a first closed-loop adjustment factor and a second closed-loop adjustment factor are determined, the difference value of the first closed-loop adjustment factor and the second closed-loop adjustment factor is calculated, if the difference value of the first closed-loop adjustment factor and the second closed-loop adjustment factor is larger than a preset threshold value, the closed-loop adjustment factor is considered to have larger change before and after the control valve is opened, at the moment, the control valve is considered to be normal, and as the control valve enters the upstream of an oxygen sensor through the control valve, the rapid rising of the closed-loop adjustment factor is caused, so that the fuel injected into a cylinder is increased, and the air-fuel ratio detected by the oxygen sensor is changed; if the difference between the first closed-loop adjustment factor and the second closed-loop adjustment factor is smaller than or equal to the preset threshold, the closed-loop adjustment factor is considered to be unchanged before and after the control valve is opened, or the change of the closed-loop adjustment factor is considered to be negligibly small, at this time, the control valve is considered to be faulty, for example, the control valve is considered to be stuck and normally closed, and because of the fault of the control valve, even if the control valve controlling the pulse secondary air injection system is opened, air cannot enter the upstream of the oxygen sensor through the control valve, and the rapid rising of the closed-loop adjustment factor is not naturally caused, so that the air-fuel ratio detected by the oxygen sensor cannot be changed.
For example, as shown in fig. 3, a schematic diagram of a closed loop adjustment factor variation according to an embodiment of the present invention is shown. As can be seen from fig. 3, in the case where the control valve is normal, the closed-loop adjustment factor is significantly changed before and after the control valve is opened, but in the case where the control valve fails, the closed-loop adjustment factor is not significantly changed before and after the control valve is opened.
In some embodiments, after obtaining the first closed loop adjustment factor, further comprising: and sending an instruction for controlling the control valve to be opened. Specifically, after the first closed-loop adjustment factor is recorded, an instruction to open the control valve is sent to the pulsed secondary air injection system to control the opening of the control valve of the pulsed secondary air injection system. FIG. 4 is a schematic diagram of a fault detection architecture for a pulsed secondary air injection system according to one embodiment of the present invention. As can be seen from fig. 4, after the ECU controls the engine to enter the closed-loop control mode, the secondary air diagnosis requests opening of the control valve, and after the secondary air control receives the request, the control valve is opened.
In some embodiments, after obtaining the second closed loop adjustment factor, further comprising: and sending a command for controlling the control valve to be closed. Specifically, after the second closed-loop adjustment factor is recorded, the secondary air diagnosis requests the control valve to be closed, and after the secondary air control receives the request, the control valve is closed.
In some embodiments, prior to obtaining the second closed loop adjustment factor, further comprising: and after the control valve is opened, if the closed-loop adjustment factor is unchanged, taking the closed-loop adjustment factor as a second closed-loop adjustment factor.
In an embodiment, after the control valve is opened, the closed-loop adjustment factor needs to be waited for to be stable, after the closed-loop adjustment factor is stable, the closed-loop adjustment factor is recorded, and the closed-loop adjustment factor is used as a second closed-loop adjustment factor.
Next, a failure detection method of a pulsed secondary air injection system according to an embodiment of the invention will be described with reference to fig. 5, as shown in a flowchart of the failure detection method of the pulsed secondary air injection system according to an embodiment of the invention.
Step S11, start.
Step S12, judging whether the engine is in a preset working condition, if so, executing step S13; if not, go to step S11.
Step S13, in a closed-loop control mode, a first closed-loop adjustment factor is acquired.
In step S14, a control valve of the pulsed secondary air injection system is controlled to be opened.
Step S15, after the control valve is opened, a second closed-loop adjustment factor is acquired.
Step S16, calculating the difference value of the first closed-loop adjustment factor and the second closed-loop adjustment factor.
Step S17, judging whether the difference value is larger than a preset threshold value, if so, executing step S18; if not, go to step S19.
Step S18, determining that the control valve is normal.
Step S19, determining a control valve failure.
According to the fault detection method of the pulse secondary air injection system, the first closed-loop adjusting factor is obtained in the closed-loop control mode, the control valve of the pulse secondary air injection system is controlled to be opened, the second closed-loop adjusting factor is obtained after the control valve is opened, and the fault detection is carried out on the control valve according to the first closed-loop adjusting factor and the second closed-loop adjusting factor, so that devices are not required to be added independently, the installation difficulty is reduced, and meanwhile the cost of the whole air is reduced.
The following describes a failure detection device of a pulsed secondary air injection system of an embodiment of the invention.
As shown in fig. 6, the malfunction detection device 2 of the pulsed secondary air injection system according to the embodiment of the invention includes: the system comprises a first control module 20, a second control module 21, an acquisition module 22 and a detection module 23, wherein the first control module 20 is used for controlling the engine to enter a closed-loop control mode when determining that the engine is in a preset working condition; the second control module 21 is configured to obtain a first closed-loop adjustment factor and control a control valve of the pulsed secondary air injection system to be opened in a closed-loop control mode; the acquisition module 22 is configured to acquire a second closed-loop adjustment factor after the control valve is opened; the detection module 23 is configured to perform fault detection on the control valve according to the first closed-loop adjustment factor and the second closed-loop adjustment factor.
It should be noted that, the specific implementation manner of the fault detection device 2 of the pulsed secondary air injection system according to the embodiment of the present invention is similar to the specific implementation manner of the fault detection method of the pulsed secondary air injection system according to any of the above embodiments of the present invention, please refer to the description of the fault detection method portion of the pulsed secondary air injection system specifically, and in order to reduce redundancy, the description is omitted here.
According to the fault detection device 2 of the pulse secondary air injection system, in the closed-loop control mode, the first closed-loop adjustment factor is obtained, the control valve of the pulse secondary air injection system is controlled to be opened, the second closed-loop adjustment factor is obtained after the control valve is opened, and the fault detection is carried out on the control valve according to the first closed-loop adjustment factor and the second closed-loop adjustment factor, so that a device is not required to be added independently, the installation difficulty is reduced, and the cost of the whole air is reduced.
In some embodiments, the detection module 23 is specifically configured to: calculating a difference between the first closed loop adjustment factor and the second closed loop adjustment factor; if the difference value is larger than the preset threshold value, the control valve is determined to be normal, otherwise, the control valve is determined to be faulty.
In some embodiments, the malfunction detection device 2 of the pulsed secondary air injection system further includes: and the sending module is also used for sending an instruction for controlling the opening of the control valve.
In some embodiments, the fault detection device of the pulsed secondary air injection system further includes a send module that is further configured to send a command to control the closing of the control valve.
In some embodiments, the acquisition module 22 is further configured to: and after the control valve is opened, if the closed-loop adjustment factor is unchanged, taking the closed-loop adjustment factor as a second closed-loop adjustment factor.
In some embodiments, the first control module 20 is further configured to determine whether the engine is in an idle or light load condition.
According to the fault detection device 2 of the pulse secondary air injection system, in the closed-loop control mode, the first closed-loop adjustment factor is obtained, the control valve of the pulse secondary air injection system is controlled to be opened, and after the control valve is opened, the second closed-loop adjustment factor is obtained, so that the fault detection is carried out on the control valve according to the first closed-loop adjustment factor and the second closed-loop adjustment factor, devices are not required to be added independently, and the whole vehicle cost is reduced while the installation difficulty is reduced.
The following describes a pulsed secondary air injection system of an embodiment of the invention.
As shown in fig. 7, the pulsed secondary air injection system 3 of the embodiment of the invention includes the failure detection device 2 of the pulsed secondary air injection system of the above-described embodiment.
According to the pulse secondary air injection system 3 provided by the embodiment of the invention, the first closed-loop adjusting factor is acquired in the closed-loop control mode, the control valve of the pulse secondary air injection system is controlled to be opened, and the second closed-loop adjusting factor is acquired after the control valve is opened, so that the control valve is subjected to fault detection according to the first closed-loop adjusting factor and the second closed-loop adjusting factor, and therefore, devices are not required to be added independently, and the cost of the whole vehicle is reduced while the installation difficulty is reduced.
A vehicle of an embodiment of the invention is described below.
As shown in fig. 8, the vehicle 4 of the embodiment of the invention includes the pulsed secondary air injection system 3 of the above-described embodiment.
According to the vehicle 4 provided by the embodiment of the invention, the first closed-loop adjustment factor is acquired in the closed-loop control mode, the control valve of the pulse secondary air injection system is controlled to be opened, and the second closed-loop adjustment factor is acquired after the control valve is opened, so that the control valve is subjected to fault detection according to the first closed-loop adjustment factor and the second closed-loop adjustment factor, and therefore, no separate device is required to be added, the installation difficulty is reduced, and the cost of the whole vehicle is reduced.
To achieve the above object, an embodiment of a fifth aspect of the invention proposes a computer-readable storage medium having stored thereon a failure detection program of a pulsed secondary air injection system, which when executed by a processor, implements the failure detection method of the pulsed secondary air injection system as in the above embodiment.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (8)
1. A fault detection method of a pulsed secondary air injection system, comprising:
when the engine is determined to be in an idle working condition or a small load working condition, controlling the engine to enter a closed-loop control mode;
under the closed-loop control mode, a first closed-loop adjusting factor is obtained, and a control valve of a pulse secondary air injection system is controlled to be opened, wherein the closed-loop adjusting factor has a certain corresponding relation with the fuel injection quantity injected into a cylinder;
After the control valve is opened, if the closed-loop adjustment factor is not changed, taking the closed-loop adjustment factor as a second closed-loop adjustment factor to obtain the second closed-loop adjustment factor;
and detecting faults of the control valve according to the first closed-loop adjustment factor and the second closed-loop adjustment factor.
2. The method of fault detection for a pulsed secondary air injection system of claim 1, wherein the fault detection for the control valve based on the first closed-loop adjustment factor and the second closed-loop adjustment factor comprises:
Calculating a difference between the first closed loop adjustment factor and the second closed loop adjustment factor;
If the difference value is larger than a preset threshold value, determining that the control valve is normal, otherwise, determining that the control valve is faulty.
3. The method of fault detection for a pulsed secondary air injection system of claim 1, further comprising, after the acquiring the first closed-loop adjustment factor: and sending an instruction for controlling the control valve to be opened.
4. The method of fault detection for a pulsed secondary air injection system of claim 1, further comprising, after the obtaining the second closed-loop adjustment factor: and sending an instruction for controlling the control valve to be closed.
5. A malfunction detection device of a pulse secondary air injection system, comprising:
the first control module is used for controlling the engine to enter a closed-loop control mode when the engine is determined to be in an idle working condition or a small load working condition;
the second control module is used for acquiring a first closed-loop adjusting factor and controlling a control valve of the pulse secondary air injection system to be opened under the closed-loop control mode, wherein the closed-loop adjusting factor has a certain corresponding relation with the fuel injection quantity injected into the cylinder;
The acquisition module is used for taking the closed-loop regulating factor as a second closed-loop regulating factor after the control valve is opened and if the closed-loop regulating factor is not changed, so as to acquire the second closed-loop regulating factor;
And the detection module is used for detecting faults of the control valve according to the first closed-loop adjustment factor and the second closed-loop adjustment factor.
6. A pulsed secondary air injection system, comprising: the malfunction detection device of a pulsed secondary air injection system according to claim 5.
7. A vehicle, characterized by comprising: the pulsed secondary air injection system of claim 6.
8. A computer-readable storage medium, characterized in that a malfunction detection program of a pulsed secondary air injection system is stored on the computer-readable storage medium, which, when executed by a processor, implements the malfunction detection method of a pulsed secondary air injection system according to any one of claims 1-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111413816.3A CN115075989B (en) | 2021-11-25 | 2021-11-25 | Pulse secondary air injection system, fault detection method and device thereof and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111413816.3A CN115075989B (en) | 2021-11-25 | 2021-11-25 | Pulse secondary air injection system, fault detection method and device thereof and vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115075989A CN115075989A (en) | 2022-09-20 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5325663A (en) * | 1992-04-27 | 1994-07-05 | Toyota Jidosha Kabushiki Kaisha | Diagnostic system for a secondary air supplier in an engine |
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| JP2724387B2 (en) * | 1990-08-28 | 1998-03-09 | 本田技研工業株式会社 | Failure detection method for exhaust air supply system for internal combustion engine |
| JP2797802B2 (en) * | 1991-12-27 | 1998-09-17 | トヨタ自動車株式会社 | Abnormality detection device for secondary air supply device |
| DE102019213787A1 (en) * | 2019-09-11 | 2021-03-11 | Robert Bosch Gmbh | Method and device for diagnosing a secondary air valve in an engine system with an internal combustion engine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5325663A (en) * | 1992-04-27 | 1994-07-05 | Toyota Jidosha Kabushiki Kaisha | Diagnostic system for a secondary air supplier in an engine |
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