CN113063582B - EGR valve diagnosis method, device, equipment and readable storage medium - Google Patents

EGR valve diagnosis method, device, equipment and readable storage medium Download PDF

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Publication number
CN113063582B
CN113063582B CN202110327551.9A CN202110327551A CN113063582B CN 113063582 B CN113063582 B CN 113063582B CN 202110327551 A CN202110327551 A CN 202110327551A CN 113063582 B CN113063582 B CN 113063582B
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egr valve
change rate
preset
map
egr
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CN113063582A (en
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刘庆波
黄子明
王伟
杜佳正
刘鹏
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Dongfeng Motor Corp
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Dongfeng Motor Corp
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M13/00—Testing of machine parts
    • G01M13/003—Machine valves
    • 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 invention provides an EGR valve diagnosis method, an EGR valve diagnosis device, EGR valve diagnosis equipment and a readable storage medium. The method comprises the following steps: when the EGR valve is determined to be abnormal according to the temperature value acquired by the EGR monitoring temperature sensor, triggering and opening the EGR valve for N times according to different opening degrees under the deceleration fuel cut-off working condition, comparing the average value of MAP with the change rate smaller than the first preset change rate within the first preset time length after triggering and opening the EGR valve each time with the MAP range corresponding to the opening sequence, and obtaining a diagnosis result according to the comparison result. According to the invention, after the EGR valve is triggered and opened once, as long as the change rate of MAP is smaller than the first preset change rate within the first preset time, the EGR valve is triggered and opened again, the EGR valve can be triggered and opened for multiple times with different opening degrees within a short time, the diagnosis required time is shortened, and double judgment is carried out based on the temperature value acquired by the EGR monitoring temperature sensor and MAP, so that the accuracy of the diagnosis result is ensured.

Description

EGR valve diagnosis method, device, equipment and readable storage medium
Technical Field
The invention relates to the technical processing field of vehicle diagnosis, in particular to an EGR valve diagnosis method, an EGR valve diagnosis device, EGR valve diagnosis equipment and a readable storage medium.
Background
EGR (Exhaust Gas Recirculation ) control systems are used to reduce the amount of nitrogen oxide emissions in exhaust gases. In an EGR control system, an EGR valve is a very important, critical component. The EGR valve is typically located on the right side of the intake manifold, adjacent the throttle body, and has a short metal tube connected to it that opens into the exhaust manifold and serves to control the amount of exhaust gas entering the intake manifold so that a certain amount of exhaust gas flows into the intake manifold for recirculation.
When the working state of the EGR valve is problematic, the purification effect of the nitrogen oxide is affected, so that the nitrogen oxide of the exhaust gas discharged by the automobile exceeds the standard, and a method for rapidly and accurately diagnosing the working state of the EGR valve is needed.
Disclosure of Invention
The present invention has been made to solve the above-mentioned problems, and provides an EGR valve diagnosis method, apparatus, device, and readable storage medium.
In a first aspect, the present invention provides an EGR valve diagnosis method including:
determining whether an EGR valve is abnormal or not according to a temperature value acquired by an EGR monitoring temperature sensor;
if it is determined that the EGR valve is abnormal, triggering and opening the EGR valve for N times according to different opening degrees under the deceleration fuel cut-off DFCO working condition, wherein after the EGR valve is triggered and opened for the Mth time, if the change rate of the absolute pressure MAP of the intake manifold is smaller than the first preset change rate within the first preset duration, triggering and opening the EGR valve for the Mth+1th time, and the like, wherein N is a positive integer greater than or equal to 3, and M is a positive integer smaller than N;
after the EGR valve is triggered and opened each time, the average value of MAP with the change rate smaller than the first preset change rate in the first preset time period is compared with the MAP range corresponding to the opening sequence, and a diagnosis result is obtained according to the comparison result.
Optionally, the step of determining whether the EGR valve is abnormal according to the temperature value acquired by the EGR monitoring temperature sensor includes:
when the temperature value acquired by the EGR monitoring temperature sensor is larger than a preset temperature value, determining that the EGR valve has an excessively high flow abnormality;
when the temperature value acquired by the EGR monitoring temperature sensor is smaller than a preset temperature value, determining that the EGR valve has insufficient flow abnormality;
and when the change rate of the temperature value acquired by the EGR monitoring temperature sensor is smaller than the second preset change rate and at least the second preset time period is kept, determining that the EGR valve has clamping stagnation abnormality.
Optionally, if it is determined that the EGR valve has an excessively high flow abnormality, the step of obtaining the diagnosis result according to the comparison result includes:
if the average value of the MAP with the change rate smaller than the first preset change rate within the first preset time period after the EGR valve is triggered and opened each time is larger than the upper limit value of the MAP range corresponding to the opening sequence, the diagnosis result is that the EGR valve has the abnormal flow rate which is too high.
Optionally, if it is determined that the EGR valve has an abnormal insufficient flow, the step of obtaining the diagnosis result according to the comparison result includes:
if the average value of the MAP with the change rate smaller than the first preset change rate within the first preset time period after the EGR valve is triggered and opened each time is smaller than the lower limit value of the MAP range corresponding to the opening sequence, the diagnosis result is that the EGR valve has insufficient flow abnormality.
Optionally, if it is determined that the EGR valve has a stuck abnormality, the step of obtaining the diagnosis result according to the comparison result includes:
if the average value of MAP with the change rate smaller than the first preset change rate in the first preset time period is smaller than the lower limit value of the MAP range corresponding to the opening sequence after the EGR valve is triggered and opened each time, the diagnosis result shows that the EGR valve has clamping stagnation abnormality, and the clamping stagnation type is normally closed;
if the average value of the MAP with the change rate smaller than the first preset change rate within the first preset time period after the EGR valve is triggered and opened each time is larger than the upper limit value of the MAP range corresponding to the opening sequence, the diagnosis result is that the EGR valve has clamping stagnation abnormality, and the clamping stagnation type is normally open.
Optionally, the step of obtaining a diagnosis result according to the comparison result includes:
if the average value of MAP with the change rate smaller than the first preset change rate in the first preset time period is in the MAP range corresponding to the opening sequence after the EGR valve is triggered and opened each time, the diagnosis result is that the EGR valve is normal;
after the step of obtaining the diagnosis result according to the comparison result, the method further comprises the following steps:
clearing the collected MAP;
and skipping to execute the step of determining whether the EGR valve is abnormal or not according to the temperature value acquired by the EGR monitoring temperature sensor.
Optionally, the EGR valve diagnosis method further includes:
and filtering the acquired MAP.
In a second aspect, the present invention also provides an EGR valve diagnostic apparatus including:
the abnormality judgment module is used for determining whether the EGR valve is abnormal or not according to the temperature value acquired by the EGR monitoring temperature sensor;
the triggering module is used for triggering and opening the EGR valve for N times according to different opening degrees under the deceleration fuel cut-off DFCO working condition if the EGR valve is abnormal, wherein after the EGR valve is triggered and opened for the Mth time, if the change rate of the absolute pressure MAP of the intake manifold is smaller than the first preset change rate within the first preset duration, the EGR valve is triggered and opened for the Mth+1th time, and the like, wherein N is a positive integer larger than or equal to 3, and M is a positive integer smaller than N;
and the diagnosis module is used for comparing the average value of the MAP with the change rate smaller than the first preset change rate in the first preset time period after the EGR valve is triggered and opened each time with the MAP range corresponding to the opening sequence, and obtaining a diagnosis result according to the comparison result.
In a third aspect, the present invention also provides an EGR valve diagnostic apparatus comprising a processor, a memory, and an EGR valve diagnostic program stored on the memory and executable by the processor, wherein the EGR valve diagnostic program, when executed by the processor, implements the steps of the EGR valve diagnostic method as described above.
In a fourth aspect, the present invention also provides a readable storage medium having stored thereon an EGR valve diagnostic program, wherein the EGR valve diagnostic program, when executed by a processor, implements the steps of the EGR valve diagnostic method as described above.
According to the invention, whether an EGR valve is abnormal or not is determined according to the temperature value acquired by the EGR monitoring temperature sensor; if it is determined that the EGR valve is abnormal, triggering and opening the EGR valve for N times according to different opening degrees under the deceleration fuel cut-off DFCO working condition, wherein after the EGR valve is triggered and opened for the Mth time, if the change rate of the absolute pressure MAP of the intake manifold is smaller than the first preset change rate within the first preset duration, triggering and opening the EGR valve for the Mth+1th time, and the like, wherein N is a positive integer greater than or equal to 3, and M is a positive integer smaller than N; after the EGR valve is triggered and opened each time, the average value of MAP with the change rate smaller than the first preset change rate in the first preset time period is compared with the MAP range corresponding to the opening sequence, and a diagnosis result is obtained according to the comparison result. According to the invention, after the EGR valve is triggered and opened once, as long as the change rate of MAP is smaller than the first preset change rate within the first preset time, the EGR valve is triggered and opened again, the EGR valve can be triggered and opened for multiple times according to different opening degrees within a short time, the required diagnosis length of the EGR valve is shortened, and double judgment is carried out based on the temperature value acquired by the EGR monitoring temperature sensor and MAP, so that the accuracy of the diagnosis result of the EGR valve is ensured.
Drawings
Fig. 1 is a schematic hardware configuration diagram of an EGR valve diagnosis apparatus according to an embodiment of the present invention;
FIG. 2 is a flow chart of an embodiment of an EGR valve diagnostic method of the present invention;
FIG. 3 is a functional block diagram of an embodiment of an EGR valve diagnostic device of the present invention.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In a first aspect, an embodiment of the present invention provides an EGR valve diagnostic apparatus.
Referring to fig. 1, fig. 1 is a schematic diagram of a hardware configuration of an EGR valve diagnosis apparatus according to an embodiment of the present invention. In an embodiment of the invention, the EGR valve diagnostic device may include a processor 1001 (e.g., central processor Central Processing Unit, CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Wherein the communication bus 1002 is used to enable connected communications between these components; the user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard); the network interface 1004 may optionally include a standard wired interface, a WIreless interface (e.g., WIreless-FIdelity, WI-FI interface); the memory 1005 may be a high-speed random access memory (random access memory, RAM) or a stable memory (non-volatile memory), such as a disk memory, and the memory 1005 may alternatively be a storage device independent of the processor 1001. Those skilled in the art will appreciate that the hardware configuration shown in fig. 1 is not limiting of the invention and may include more or fewer components than shown, or may combine certain components, or a different arrangement of components.
With continued reference to FIG. 1, an operating system, a network communication module, a user interface module, and an EGR valve diagnostic program may be included in memory 1005, which is one type of computer storage medium in FIG. 1. The processor 1001 may call an EGR valve diagnosis program stored in the memory 1005, and execute the EGR valve diagnosis method provided by the embodiment of the present invention.
In a second aspect, embodiments of the present invention provide an EGR valve diagnostic method.
In one embodiment, referring to FIG. 2, FIG. 2 is a flow chart of an embodiment of an EGR valve diagnostic method of the present invention. As shown in fig. 2, the EGR valve diagnostic method includes:
step S10, determining whether an EGR valve is abnormal or not according to a temperature value acquired by an EGR monitoring temperature sensor;
in this embodiment, an EGR monitoring temperature sensor is installed on an intake pipe of an EGR valve, and then whether the EGR valve is abnormal is determined according to a temperature value acquired by the EGR monitoring temperature sensor. For example, when the temperature value collected by the EGR monitoring temperature sensor is too high or too low, it is determined that there is an abnormality in the EGR valve, or when the temperature value collected by the EGR monitoring temperature sensor is substantially unchanged and is maintained for a certain period of time, it is determined that there is an abnormality in the EGR valve. Wherein, a middle value can be set, if the temperature value collected by the EGR monitoring temperature sensor is larger than the middle value, the temperature value collected by the EGR monitoring temperature sensor is considered to be too high, and if the temperature value collected by the EGR monitoring temperature sensor is smaller than the middle value, the temperature value collected by the EGR monitoring temperature sensor is considered to be too low.
Further, in an embodiment, step S10 includes:
when the temperature value acquired by the EGR monitoring temperature sensor is larger than a preset temperature value, determining that the EGR valve has an excessively high flow abnormality; when the temperature value acquired by the EGR monitoring temperature sensor is smaller than a preset temperature value, determining that the EGR valve has insufficient flow abnormality; and when the change rate of the temperature value acquired by the EGR monitoring temperature sensor is smaller than the second preset change rate and at least the second preset time period is kept, determining that the EGR valve has clamping stagnation abnormality.
In the embodiment, the preset temperature value is obtained according to experiments, and when the temperature value acquired by the EGR monitoring temperature sensor is larger than the preset temperature value, the condition that the EGR valve has excessively high flow is determined; when the temperature value acquired by the EGR monitoring temperature sensor is smaller than a preset temperature value, determining that the EGR valve has insufficient flow abnormality. And when the temperature value acquired by the EGR monitoring temperature sensor is kept stable for a period of time, determining that the EGR valve has a clamping stagnation abnormality, for example, if the change rate from the minimum value to the maximum value of the temperature value acquired by the EGR monitoring temperature sensor is x in a second preset time period, if x is smaller than the second preset change rate, determining that the EGR valve has the clamping stagnation abnormality. The second preset duration and the second preset change rate are set according to actual needs.
Step S20, if it is determined that the EGR valve is abnormal, triggering and opening the EGR valve for N times according to different opening degrees under the deceleration fuel cut-off DFCO working condition, wherein after the EGR valve is triggered and opened for the Mth time, if the change rate of the absolute pressure MAP of the intake manifold is smaller than the first preset change rate within the first preset duration, triggering and opening the EGR valve for the Mth+1th time, and the like, wherein N is a positive integer greater than or equal to 3, and M is a positive integer smaller than N;
in this embodiment, if it is determined that the EGR valve is abnormal according to step S10, the EGR valve is triggered and opened N times according to different openings under the deceleration fuel cut-off DFCO working condition. Where N is a positive integer greater than or equal to 3, e.g., N takes 3. And if the EGR valve is confirmed to be abnormal, the EGR valve is triggered according to the first opening degree under the deceleration fuel cut-off DFCO working condition, then the EGR valve is triggered according to the second opening degree, finally the EGR valve is triggered according to the third opening degree, and the EGR valve is triggered and opened for 3 times in total. And after triggering and opening the EGR valve according to the first opening degree (i.e., triggering and opening the EGR valve for the first time), if the change rate of the absolute pressure MAP of the intake manifold is smaller than the first preset change rate within the first preset time period, triggering and opening the EGR valve according to the second opening degree (i.e., triggering and opening the EGR valve for the second time), and if the change rate of the absolute pressure MAP of the intake manifold is smaller than the first preset change rate within the first preset time period after triggering and opening the EGR valve according to the second opening degree, triggering and opening the EGR valve according to the third opening degree (i.e., triggering and opening the EGR valve for the third time).
The specific sizes of the first opening, the second opening and the third opening are set according to actual needs, for example, the first opening is 15%, the second opening is 50%, and the third opening is 90%. The first preset duration and the first preset change rate are set according to actual needs, for example, the first preset duration is set to 0.3s, and the first preset change rate is set to 10%. That is, when the rate of change of the intake manifold absolute pressure MAP from the minimum value to the maximum value within 0.3s is less than 10%, the rate of change of the intake manifold absolute pressure MAP is considered to be less than the first preset rate of change for the first preset duration.
In the existing diagnosis process of the EGR valve, the EGR valve is generally opened for 3 times, and the opening time of each time is fixed, namely, after the EGR valve is opened, the EGR valve is again started after a preset time. In this way, in order to ensure that a stable MAP can be obtained after each opening of the EGR valve, the preset duration is generally set to be longer, for example, 1s, and then 3s is required to obtain a stable MAP corresponding to 3 times of opening of the EGR valve. According to the method of triggering and opening the EGR valve for multiple times in this embodiment, after the EGR valve is triggered and opened according to an opening degree for a certain time (that is, the EGR valve is triggered and opened for the first time), if the change rate of the absolute pressure MAP of the intake manifold is smaller than the first preset change rate within the first preset time period, the EGR valve is directly triggered and opened again according to another opening degree, and when the first preset time period is set to 0.3s, the stable MAP corresponding to the EGR valve can be obtained only by 0.9s at the highest speed, and compared with the existing flow, the time period required for EGR diagnosis is shortened.
And step S30, after the EGR valve is triggered and opened each time, comparing the average value of the MAP with the change rate smaller than the first preset change rate in the first preset time period with the MAP range corresponding to the opening sequence, and obtaining a diagnosis result according to the comparison result.
In this embodiment, after the EGR valve is opened each time triggered, when the change rate of the MAP is smaller than the first preset change rate in the first preset time period, the average value of the MAPs in the first preset time period is compared with the MAP range corresponding to the opening sequence. If the EGR valve is triggered and opened for the first time, comparing the average value of the MAP in the corresponding first preset time period with the MAP range of which the opening sequence is the first corresponding; similarly, if the EGR valve is triggered and opened for the second time, comparing the average value of the MAP in the corresponding first preset time period with the MAP range corresponding to the second time in the opening sequence, and so on to obtain a plurality of comparison results, and then obtaining a final diagnosis result according to the plurality of comparison results. Among them, it is easy to understand that since the EGR valve is triggered to be opened each time with a different opening, the corresponding MAP range is set according to each opening.
Further, in an embodiment, if it is determined that the EGR valve has an excessively high flow abnormality, the step of obtaining the diagnosis result according to the comparison result includes:
if the average value of the MAP with the change rate smaller than the first preset change rate within the first preset time period after the EGR valve is triggered and opened each time is larger than the upper limit value of the MAP range corresponding to the opening sequence, the diagnosis result is that the EGR valve has the abnormal flow rate which is too high.
In this embodiment, if it is determined that the EGR valve has an excessively high flow abnormality according to step S10, and after each triggering of opening the EGR valve, the average value of MAPs with a change rate smaller than the first preset change rate within the first preset time period is larger than the upper limit value of the MAP range corresponding to the opening sequence, then the diagnosis result is that the EGR valve has an excessively high flow abnormality. When the diagnosis result shows that the EGR valve has the abnormal condition of overhigh flow, a corresponding alarm prompt is output so that relevant technicians can process the abnormal condition in time.
Further, in an embodiment, if it is determined that the EGR valve has an abnormal flow, the step of obtaining the diagnosis result according to the comparison result includes:
if the average value of the MAP with the change rate smaller than the first preset change rate within the first preset time period after the EGR valve is triggered and opened each time is smaller than the lower limit value of the MAP range corresponding to the opening sequence, the diagnosis result is that the EGR valve has insufficient flow abnormality.
In this embodiment, if it is determined that the EGR valve has an insufficient flow abnormality according to step S10, and after each triggering of opening the EGR valve, the average value of MAPs with a change rate smaller than the first preset change rate within the first preset time period is smaller than the lower limit value of the MAP range corresponding to the opening sequence, then the diagnosis result is that the EGR valve has an insufficient flow abnormality. When the diagnosis result shows that the EGR valve has insufficient flow and is abnormal, a corresponding alarm prompt is output so that relevant technicians can process abnormal conditions in time.
Further, in an embodiment, if it is determined that the EGR valve has a stuck abnormality, the step of obtaining the diagnosis result according to the comparison result includes:
if the average value of MAP with the change rate smaller than the first preset change rate in the first preset time period is smaller than the lower limit value of the MAP range corresponding to the opening sequence after the EGR valve is triggered and opened each time, the diagnosis result shows that the EGR valve has clamping stagnation abnormality, and the clamping stagnation type is normally closed;
if the average value of the MAP with the change rate smaller than the first preset change rate within the first preset time period after the EGR valve is triggered and opened each time is larger than the upper limit value of the MAP range corresponding to the opening sequence, the diagnosis result is that the EGR valve has clamping stagnation abnormality, and the clamping stagnation type is normally open.
In this embodiment, if it is determined that the EGR valve has a stuck abnormality according to step S10, it is necessary to further confirm the stuck type. Specifically, if after the EGR valve is triggered and opened each time, the average value of MAPs with the change rate smaller than the first preset change rate within the first preset time period is smaller than the lower limit value of the MAP range corresponding to the opening sequence, it is confirmed that the EGR valve has a clamping abnormal condition, and the clamping type is normally closed. And if the average value of the MAP with the change rate smaller than the first preset change rate in the first preset time period is larger than the upper limit value of the MAP range corresponding to the opening sequence after the EGR valve is triggered to be opened each time, confirming that the EGR valve has clamping stagnation abnormality, and the clamping stagnation type is normally open. When the diagnosis result shows that the EGR valve is abnormal in normal close/normal open, a corresponding alarm prompt is output so that related technicians can process abnormal conditions in time.
In the embodiment, whether the EGR valve is abnormal or not is determined according to the temperature value acquired by the EGR monitoring temperature sensor; if it is determined that the EGR valve is abnormal, triggering and opening the EGR valve for N times according to different opening degrees under the deceleration fuel cut-off DFCO working condition, wherein after the EGR valve is triggered and opened for the Mth time, if the change rate of the absolute pressure MAP of the intake manifold is smaller than the first preset change rate within the first preset duration, triggering and opening the EGR valve for the Mth+1th time, and the like, wherein N is a positive integer greater than or equal to 3, and M is a positive integer smaller than N; after the EGR valve is triggered and opened each time, the average value of MAP with the change rate smaller than the first preset change rate in the first preset time period is compared with the MAP range corresponding to the opening sequence, and a diagnosis result is obtained according to the comparison result. According to the embodiment, after the EGR valve is triggered and opened once, as long as the change rate of MAP is smaller than the first preset change rate within the first preset time, the EGR valve is triggered and opened again, the EGR valve can be triggered and opened for multiple times according to different opening degrees in a short time, the required diagnosis length of the EGR valve is shortened, and double judgment is carried out based on the temperature value acquired by the EGR monitoring temperature sensor and MAP, so that the accuracy of the diagnosis result of the EGR valve is ensured.
Further, in an embodiment, the step of obtaining the diagnosis result according to the comparison result includes:
if the average value of MAP with the change rate smaller than the first preset change rate in the first preset time period is in the MAP range corresponding to the opening sequence after the EGR valve is triggered and opened each time, the diagnosis result is that the EGR valve is normal;
after the step of obtaining the diagnosis result according to the comparison result, the method further comprises the following steps:
clearing the collected MAP;
and skipping to execute the step of determining whether the EGR valve is abnormal or not according to the temperature value acquired by the EGR monitoring temperature sensor.
In this embodiment, since there is inaccuracy in the manner of determining whether there is an abnormality in the EGR valve depending on the temperature, it is necessary to further determine whether there is an abnormality in the EGR valve based on the MAP value. When the EGR valve is determined to be abnormal according to the temperature value acquired by the EGR monitoring temperature sensor, but after the EGR valve is triggered and opened every time later, the average value of MAP with the change rate smaller than the first preset change rate in the first preset time period is in the MAP range corresponding to the opening sequence, and the diagnosis result is that the EGR valve is normal. When the EGR valve is confirmed to be normal, the collected MAP data is cleared, and the collected temperature data can be cleared, so that the step S10 is skipped to restart monitoring and abnormality diagnosis of the EGR valve.
Further, in an embodiment, the EGR valve diagnostic method further includes:
and filtering the acquired MAP.
In this embodiment, in step S20, after the EGR valve is triggered to be opened, the MAP is collected, and then, the EGR valve diagnosis can be performed according to the collected MAP. In order to improve the diagnosis accuracy, filtering processing is required to be performed on the acquired MAP, so that interference information is removed.
In a third aspect, an embodiment of the present invention further provides an EGR valve diagnosis apparatus.
In one embodiment, referring to fig. 3, fig. 3 is a functional block diagram of an EGR valve diagnosis device according to an embodiment of the present invention, and as shown in fig. 3, the EGR valve diagnosis device includes:
the abnormality judgment module 10 is used for determining whether the EGR valve is abnormal or not according to the temperature value acquired by the EGR monitoring temperature sensor;
the triggering module 20 is configured to trigger and open the EGR valve N times according to different opening degrees under the deceleration fuel cut-off DFCO working condition if it is determined that the EGR valve is abnormal, where after the EGR valve is opened by the mth triggering, if the change rate of the absolute pressure MAP of the intake manifold is smaller than the first preset change rate within the first preset duration, the EGR valve is opened by the mth+1th triggering, and so on, where N is a positive integer greater than or equal to 3, and M is a positive integer smaller than N;
the diagnosing module 30 is configured to compare an average value of MAPs having a rate of change less than a first preset rate of change within a first preset duration with a MAP range corresponding to an opening sequence after each triggering to open the EGR valve, and obtain a diagnosing result according to a comparison result.
Further, in an embodiment, the anomaly determination module 10 is configured to:
when the temperature value acquired by the EGR monitoring temperature sensor is larger than a preset temperature value, determining that the EGR valve has an excessively high flow abnormality;
when the temperature value acquired by the EGR monitoring temperature sensor is smaller than a preset temperature value, determining that the EGR valve has insufficient flow abnormality;
and when the change rate of the temperature value acquired by the EGR monitoring temperature sensor is smaller than the second preset change rate and at least the second preset time period is kept, determining that the EGR valve has clamping stagnation abnormality.
Further, in one embodiment, if it is determined that the EGR valve has an excessively high flow abnormality, the diagnostic module 30 is configured to:
if the average value of the MAP with the change rate smaller than the first preset change rate within the first preset time period after the EGR valve is triggered and opened each time is larger than the upper limit value of the MAP range corresponding to the opening sequence, the diagnosis result is that the EGR valve has the abnormal flow rate which is too high.
Further, in one embodiment, if it is determined that the EGR valve has an insufficient flow abnormality, the diagnostic module 30 is configured to:
if the average value of the MAP with the change rate smaller than the first preset change rate within the first preset time period after the EGR valve is triggered and opened each time is smaller than the lower limit value of the MAP range corresponding to the opening sequence, the diagnosis result is that the EGR valve has insufficient flow abnormality.
Further, in one embodiment, if it is determined that the EGR valve has a stuck anomaly, the diagnostic module 30 is configured to:
if the average value of MAP with the change rate smaller than the first preset change rate in the first preset time period is smaller than the lower limit value of the MAP range corresponding to the opening sequence after the EGR valve is triggered and opened each time, the diagnosis result shows that the EGR valve has clamping stagnation abnormality, and the clamping stagnation type is normally closed;
if the average value of the MAP with the change rate smaller than the first preset change rate within the first preset time period after the EGR valve is triggered and opened each time is larger than the upper limit value of the MAP range corresponding to the opening sequence, the diagnosis result is that the EGR valve has clamping stagnation abnormality, and the clamping stagnation type is normally open.
Further, in an embodiment, the diagnostic module 30 is configured to:
if the average value of MAP with the change rate smaller than the first preset change rate in the first preset time period is in the MAP range corresponding to the opening sequence after the EGR valve is triggered and opened each time, the diagnosis result is that the EGR valve is normal;
the EGR valve diagnostic device further includes:
the clearing module is used for clearing the acquired MAP;
and the jump module is used for jumping to execute the step of determining whether the EGR valve is abnormal or not according to the temperature value acquired by the EGR monitoring temperature sensor.
Further, in an embodiment, the EGR valve diagnostic device further includes:
and the filtering module is used for carrying out filtering processing on the acquired MAP.
The function implementation of each module in the EGR valve diagnosis device corresponds to each step in the embodiment of the EGR valve diagnosis method, and the function and implementation process thereof are not described in detail herein.
In a fourth aspect, embodiments of the present invention also provide a readable storage medium.
The readable storage medium of the present invention stores an EGR valve diagnostic program, which when executed by a processor, implements the steps of the EGR valve diagnostic method as described above.
The method implemented when the EGR valve diagnosing program is executed may refer to various embodiments of the EGR valve diagnosing method of the present invention, and will not be described herein.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) as described above, comprising several instructions for causing a terminal device to perform the method according to the embodiments of the present invention.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.

Claims (9)

1. An EGR valve diagnosis method, characterized by comprising:
determining whether an EGR valve is abnormal or not according to a temperature value acquired by an EGR monitoring temperature sensor;
if the EGR valve is abnormal, triggering and opening the EGR valve for N times according to different opening degrees under the deceleration fuel cut-off DFCO working condition, wherein after the EGR valve is triggered and opened for M times, if the change rate of the absolute pressure MAP of the intake manifold is smaller than the preset first change rate within the first preset duration, triggering and opening the EGR valve for M+1th time, and the like, wherein N is a positive integer larger than or equal to 3, and M is a positive integer smaller than N;
after the EGR valve is triggered and opened each time, comparing an average value of MAP with a change rate smaller than a first preset change rate in a first preset time period with a MAP range corresponding to an opening sequence, and obtaining a diagnosis result according to a comparison result;
the step of determining whether the EGR valve is abnormal according to the temperature value acquired by the EGR monitoring temperature sensor comprises the following steps:
when the temperature value acquired by the EGR monitoring temperature sensor is larger than a preset temperature value, determining that the EGR valve has an excessively high flow abnormality;
if it is determined that the EGR valve has an excessively high flow abnormality, the step of obtaining a diagnosis result according to the comparison result includes:
if the average value of the MAP with the change rate smaller than the first preset change rate within the first preset time period after the EGR valve is triggered and opened each time is larger than the upper limit value of the MAP range corresponding to the opening sequence, the diagnosis result is that the EGR valve has the abnormal flow rate which is too high.
2. The EGR valve diagnostic method of claim 1, wherein the step of determining whether an abnormality exists in the EGR valve based on the temperature value acquired by the EGR monitoring temperature sensor comprises:
when the temperature value acquired by the EGR monitoring temperature sensor is smaller than a preset temperature value, determining that the EGR valve has insufficient flow abnormality;
and when the change rate of the temperature value acquired by the EGR monitoring temperature sensor is smaller than the second preset change rate and at least the second preset time period is kept, determining that the EGR valve has clamping stagnation abnormality.
3. The EGR valve diagnostic method of claim 2, wherein if it is determined that there is an insufficient flow abnormality of the EGR valve, the step of obtaining the diagnostic result based on the comparison result includes:
if the average value of the MAP with the change rate smaller than the first preset change rate within the first preset time period after the EGR valve is triggered and opened each time is smaller than the lower limit value of the MAP range corresponding to the opening sequence, the diagnosis result is that the EGR valve has insufficient flow abnormality.
4. The EGR valve diagnostic method of claim 2, wherein if it is determined that the EGR valve has a stuck abnormality, the step of obtaining the diagnostic result based on the comparison result includes:
if the average value of MAP with the change rate smaller than the first preset change rate in the first preset time period is smaller than the lower limit value of the MAP range corresponding to the opening sequence after the EGR valve is triggered and opened each time, the diagnosis result shows that the EGR valve has clamping stagnation abnormality, and the clamping stagnation type is normally closed;
if the average value of the MAP with the change rate smaller than the first preset change rate within the first preset time period after the EGR valve is triggered and opened each time is larger than the upper limit value of the MAP range corresponding to the opening sequence, the diagnosis result is that the EGR valve has clamping stagnation abnormality, and the clamping stagnation type is normally open.
5. The EGR valve diagnostic method according to any one of claims 1 to 4, characterized in that the step of obtaining a diagnostic result based on the comparison result includes:
if the average value of MAP with the change rate smaller than the first preset change rate in the first preset time period is in the MAP range corresponding to the opening sequence after the EGR valve is triggered and opened each time, the diagnosis result is that the EGR valve is normal;
after the step of obtaining the diagnosis result according to the comparison result, the method further comprises the following steps:
clearing the collected MAP;
and skipping to execute the step of determining whether the EGR valve is abnormal or not according to the temperature value acquired by the EGR monitoring temperature sensor.
6. The EGR valve diagnostic method according to any one of claims 1 to 4, characterized in that the EGR valve diagnostic method further includes:
and filtering the acquired MAP.
7. An EGR valve diagnostic device characterized by comprising:
the abnormality judgment module is used for determining whether the EGR valve is abnormal or not according to the temperature value acquired by the EGR monitoring temperature sensor;
the triggering module is used for triggering and opening the EGR valve for N times according to different opening degrees under the deceleration fuel cut-off DFCO working condition if the EGR valve is abnormal, wherein after the EGR valve is triggered and opened for the Mth time, if the change rate of the absolute pressure MAP of the intake manifold is smaller than the first preset change rate within the first preset duration, the EGR valve is triggered and opened for the Mth+1th time, and the like, wherein N is a positive integer larger than or equal to 3, and M is a positive integer smaller than N;
the diagnosis module is used for comparing the average value of the MAP with the change rate smaller than the first preset change rate in the first preset time period after the EGR valve is triggered and opened each time with the MAP range corresponding to the opening sequence, and obtaining a diagnosis result according to the comparison result;
the abnormality judgment module is used for:
when the temperature value acquired by the EGR monitoring temperature sensor is larger than a preset temperature value, determining that the EGR valve has an excessively high flow abnormality;
if it is determined that the EGR valve has an excessively high flow abnormality, the diagnostic module is configured to:
if the average value of the MAP with the change rate smaller than the first preset change rate within the first preset time period after the EGR valve is triggered and opened each time is larger than the upper limit value of the MAP range corresponding to the opening sequence, the diagnosis result is that the EGR valve has the abnormal flow rate which is too high.
8. An EGR valve diagnostic apparatus comprising a processor, a memory, and an EGR valve diagnostic program stored on the memory and executable by the processor, wherein the EGR valve diagnostic program, when executed by the processor, implements the steps of the EGR valve diagnostic method according to any one of claims 1 to 6.
9. A readable storage medium, characterized in that the readable storage medium has stored thereon an EGR valve diagnostic program, wherein the EGR valve diagnostic program, when executed by a processor, realizes the steps of the EGR valve diagnostic method according to any one of claims 1 to 6.
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