CN110146757B - Electromagnetic valve structural fault diagnosis method for ECAS system - Google Patents
Electromagnetic valve structural fault diagnosis method for ECAS system Download PDFInfo
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- CN110146757B CN110146757B CN201910416039.4A CN201910416039A CN110146757B CN 110146757 B CN110146757 B CN 110146757B CN 201910416039 A CN201910416039 A CN 201910416039A CN 110146757 B CN110146757 B CN 110146757B
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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
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
- G01M3/3236—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers
- G01M3/3263—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers using a differential pressure detector
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
Abstract
The invention discloses a structural fault diagnosis method for an electromagnetic valve of an ECAS (electronic control and as a service) system, which mainly aims at solving the problem that the conventional ECAS system lacks structural fault diagnosis for the electromagnetic valve. The method comprises the following implementation steps: an air bag air pressure changing instruction is sent to the electromagnetic valve through the ECU, whether the air pressure of the corresponding air bag changes according to expectation is detected, and whether structural faults exist in the electromagnetic valve is further judged. The invention utilizes the functional module in the existing ECAS system, adds the diagnosis logic in the control unit, can realize the detection of the structural fault of the electromagnetic valve without adding an additional module, and simultaneously sends out different alarm signals according to different fault types and fault degrees, can process the potential fault in time, enhances the safety performance of the ECAS system, and has strong practicability and easy realization.
Description
Technical Field
The invention belongs to the technical field of electronic fault diagnosis of automobiles, and particularly relates to a fault diagnosis method for an electromagnetic valve in an electronic-controlled air suspension (ECAS) system, in particular to a structural fault diagnosis method for the electromagnetic valve in the ECAS system.
Background
Along with the rapid development of the automobile electronic industry, the electronic control air suspension system is more and more applied to various types of vehicle control systems, and the electromagnetic valve is used as a key module in the air suspension system, is used for controlling the height between a vehicle frame and a vehicle body, and plays a vital role in the control performance of the air suspension system. If the electromagnetic valve has a functional fault, the control effect of the air suspension system on the vehicle body can be seriously influenced, so that some diagnosis methods are needed to prevent and identify the fault of the electromagnetic valve and locate a specific fault source.
Most of the existing solenoid valve fault diagnosis methods for the ECAS system aim at short circuit and open circuit faults of a solenoid valve induction coil part, and are less related to structural faults of a solenoid valve body part, such as solenoid valve blockage faults and solenoid valve air leakage faults. In addition, in the actual use process of the vehicle, the occurrence frequency of the structural faults of the electromagnetic valve is higher than that of the electrical faults, so the structural faults of the electromagnetic valve must be diagnosed, and the vehicle performance maintenance is facilitated.
Disclosure of Invention
The invention aims to provide a structural fault diagnosis method for an electromagnetic valve of an ECAS (electronic control system) system, aiming at the defects in the prior art, and the structural fault diagnosis method is characterized in that on the basis of the existing electromagnetic valve fault detection circuit, an air pressure sensor arranged on an air bag is utilized to identify whether the control of an ECU (electronic control unit) on the electromagnetic valve reaches an expected result, and the structural fault of the electromagnetic valve is judged by combining the fault detection circuit, so that different warning signals can be generated for a driver according to the type and the degree of the fault.
The purpose of the invention is realized by the following technical scheme: a structural fault diagnosis method for a solenoid valve of an ECAS system, the method comprising the steps of:
(1) the ECU detects whether the electromagnetic valve has electrical faults, if yes, the fault detection is finished and an alarm is given, otherwise, the step (2) is executed to start structural fault detection;
(2) the ECU acquires an air bag air pressure value P1 at the current time t1 by using an air pressure sensor arranged on an air bag, and judges whether the difference value between the current air bag air pressure value P1 and an air bag air pressure value P2 detected and recorded in the previous period exceeds an air leakage threshold value L1, if so, the air leakage fault of the electromagnetic valve is considered to occur;
(3) the ECU sends a control signal to the electromagnetic valve to increase or decrease the air pressure value delta P of each air bag;
(4) after the ECU waits for time t0, detecting and recording a corresponding air bag air pressure value P2, and calculating a difference value delta P between the air bag air pressure value P2 and an air bag air pressure value P1 at time t 1;
(5) if the difference value between the delta P and the delta P is larger than the error e, the electromagnetic valve is considered to be blocked;
(6) and (3) after waiting for a period T, returning to the step (1) to start the next electromagnetic valve fault detection.
Further, in the step (2),
when the air pressure difference value of the air bag detected twice is smaller than an air leakage threshold value L1, the electromagnetic valve is considered to have no air leakage fault;
when the air pressure difference value of the air bag detected twice is larger than the air leakage threshold value L1 and smaller than the air leakage threshold value L2, the electromagnetic valve is considered to be in slight air leakage fault;
when the air pressure difference value of the air bag detected twice is larger than the air leakage threshold value L2, the electromagnetic valve is considered to have serious air leakage fault.
Further, in the step (5), the jam fault degree is identified according to the size of the delta p,
when the delta p is less than or equal to the error e, the electromagnetic valve is considered to be seriously blocked and faulted;
when the delta p is larger than the error e, the solenoid valve is considered to have a slight blockage fault.
Further, the increased or decreased air pressure value Δ P does not affect the normal running of the vehicle.
Further, when the control signal sent by the ECU to the electromagnetic valve for the previous time is to increase the air bag air pressure, the next control signal is to decrease the air bag air pressure;
when the control signal sent by the ECU to the solenoid valve last time is to decrease the air bag pressure, the next control signal will be to increase the air bag pressure.
Further, the air pressure value Δ P, the waiting time t0, the air leakage threshold value L1 and the air leakage threshold value L2 are adjusted in real time according to different air bag air pressure conditions.
Further, when an electrical failure of the solenoid valve occurs, a solenoid valve failure warning is directly sent to the driver without performing other diagnosis.
Further, when the air leakage fault of the electromagnetic valve occurs, a normal warning is sent to the driver when the air leakage is slight, and a parking warning is sent to the driver when the air leakage is serious.
Further, a general warning is sent to the driver when a slight clogging failure of the solenoid valve occurs, and a stop warning is sent to the driver when a serious clogging failure of the solenoid valve occurs.
The invention has the beneficial effects that: the method has the advantages that the functional modules in the conventional ECAS system are utilized, the diagnosis logic is added in the control unit, the detection of the structural fault of the electromagnetic valve can be realized without adding additional modules, different alarm signals are sent according to different fault types and fault degrees, the potential fault can be timely processed, the safety performance of the ECAS system is enhanced, and the method is strong in practicability and easy to realize.
Drawings
FIG. 1 is a general flow diagram of the method of the present invention;
FIG. 2 is a flow chart of solenoid valve jam fault detection in the present invention;
FIG. 3 is a flow chart of the solenoid valve leakage fault detection in the present invention.
Detailed Description
The technical means and effects of the present invention will be described in further detail below with reference to the accompanying drawings.
As shown in fig. 1, each time the diagnosis is started, the ECU first detects whether there is an electrical failure of the solenoid valve. If the electrical fault exists, a warning is directly sent to a driver, and when the electrical property of the electromagnetic valve is normal, whether the electromagnetic valve is blocked or not and the air leakage fault exists or not is diagnosed. The next diagnosis is started by waiting for the time of the next cycle after each diagnosis is completed, and the diagnosis period T is set to 60 minutes.
As shown in fig. 2, when the electromagnetic valve blockage fault diagnosis is started, the ECU first obtains and records an air bag air pressure value P1 at time t1 of each air bag, outputs a control signal to the electromagnetic valve, and controls the air pressure of the air bag to increase or decrease a fixed air pressure safety threshold value Δ P, wherein the value range of Δ P is 0.01MPa to 0.05MPa, the specific size depends on the current air bag air pressure value, the larger the current air bag air pressure value is, the larger Δ P is, and otherwise, the smaller Δ P is, and it is ensured that the air bag height is not affected.
The direction of the change of the air pressure of the control air bag output by the ECU is opposite to the previous time, and the influence of the diagnostic program on the air pressure of the air bag is reduced as much as possible. That is, when the control signal sent by the ECU to the solenoid valve in the previous time is to increase the air bag pressure, the next control signal will be to decrease the air bag pressure. When the control signal sent by the ECU to the solenoid valve last time is to decrease the air bag pressure, the next control signal will be to increase the air bag pressure.
In order to make the solenoid valve have sufficient time to perform the inflation and deflation operations, after applying a control signal to the solenoid valve, waiting for a time t0, detecting and recording a corresponding air bag air pressure value P2, and calculating a difference value Δ P between the air bag air pressure value P2 and the air bag air pressure value P1 at the time t1, wherein t0 generally takes 10 seconds.
When the error is smaller than or equal to the error e, the solenoid valve is considered to be seriously blocked and faulted, when the error is larger than the error e and is smaller than the error P, the solenoid valve is considered to be slightly blocked and faulted, and the value of the error e is 0.3 x delta P.
As shown in fig. 3, the ECU records the latest numerical value record when acquiring the air pressure of each air bag each time, and stores the data corresponding to each air bag in the EEPROM, thereby ensuring that the data is not lost in case of power failure.
When a new fault diagnosis is carried out, the ECU compares the latest air pressure data of each air bag with the corresponding air bag air pressure value recorded in the EEPROM, if the difference value between the latest data and the air pressure recorded in the EEPROM is more than an air leakage threshold value L1, the air leakage fault of the electromagnetic valve is considered to occur, the air pressure difference value of the air bag is more than an air leakage threshold value L1, and meanwhile, the air leakage of the electromagnetic valve is considered to be slight when the air pressure difference value is less than an air leakage threshold value L2; when the air pressure difference value of the air bag is greater than the air leakage threshold value L2, the solenoid valve is considered to have serious air leakage fault, L2 can be set to be 3L 1, and typical application values are as follows: l1 was set at 0.01MPa and L2 was set at 0.03 MPa.
And sending ordinary warning information to the driver when a slight air leakage fault occurs, and sending parking warning to the driver when a serious air leakage fault occurs.
The ECU can perform the following on the parameters according to the real-time air pressure of the air bag: the air pressure value deltap, the waiting time t0, the air leakage threshold value L1, the air leakage threshold value L2 and the like.
In summary, the method provided by the invention is based on the air bag air pressure sensor in the ECAS system, and the method provided by the invention is additionally provided with a method for structural fault diagnosis of the electromagnetic valve on the basis of fault diagnosis of the electromagnetic valve in the conventional ECAS system, and the electromagnetic valve fault diagnosis is realized by controlling the air pressure of the air bag to change through the ECU and monitoring whether the real-time air pressure of the air bag generates corresponding change according to expectation. The method makes full use of the existing functional module of the ECAS system, can quickly realize the function of diagnosing the structural fault of the electromagnetic valve by adding a diagnosis logic program on the basis of the existing functional module, and is easy to quickly realize on the actual ECAS system.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A structural fault diagnosis method for a solenoid valve of an ECAS system is characterized by comprising the following steps:
(1) the ECU detects whether the electromagnetic valve has electrical faults, if yes, the fault detection is finished and an alarm is given, otherwise, the step (2) is executed to start structural fault detection;
(2) the ECU acquires an air bag air pressure value P1 at the current time t1 by using an air pressure sensor arranged on an air bag, and judges whether the difference value between the current air bag air pressure value P1 and an air bag air pressure value P2 detected and recorded in the previous period exceeds an air leakage threshold value L1, if so, the air leakage fault of the electromagnetic valve is considered to occur;
(3) the ECU sends a control signal to the electromagnetic valve to increase or decrease the air pressure of each air bag by the air pressure value P;
(4) after the ECU waits for time t0, detecting and recording a corresponding air bag air pressure value P2, and calculating a difference value Δ P between the air bag air pressure value P2 and the air bag air pressure value P1 at time t 1;
(5) if the difference between the Δ P and the Δ P is larger than the error e, the electromagnetic valve blockage fault is considered to occur;
(6) and (3) after waiting for a period T, returning to the step (1) to start the next electromagnetic valve fault detection.
2. The structural fault diagnosis method for solenoid valves of ECAS system according to claim 1, wherein in said step (2),
when the air pressure difference value of the air bag detected twice is smaller than an air leakage threshold value L1, the electromagnetic valve is considered to have no air leakage fault;
when the air pressure difference value of the air bag detected twice is larger than the air leakage threshold value L1 and smaller than the air leakage threshold value L2, the electromagnetic valve is considered to be in slight air leakage fault;
when the air pressure difference value of the air bag detected twice is larger than the air leakage threshold value L2, the electromagnetic valve is considered to have serious air leakage fault.
3. The structural fault diagnosis method for the electromagnetic valves of the ECAS system according to claim 1, characterized in that in the step (5), the error e is 0.3 Δ P, the degree of the jamming fault is identified according to the size of Δ P,
when the error p is less than or equal to the error e, the electromagnetic valve is considered to be seriously blocked;
when the error p is larger than the error e, the electromagnetic valve is considered to have a slight blockage fault.
4. The structural fault diagnosis method of a solenoid valve for an ECAS system according to claim 1, characterized in that: the increased or decreased air pressure value Δ P does not affect the normal running of the vehicle.
5. The structural fault diagnosis method of a solenoid valve for an ECAS system according to claim 1, characterized in that: when the control signal sent to the electromagnetic valve by the ECU in the previous time is to increase the air pressure of the air bag, the next control signal is to decrease the air pressure of the air bag;
when the control signal sent by the ECU to the solenoid valve last time is to decrease the air bag pressure, the next control signal will be to increase the air bag pressure.
6. The structural fault diagnosis method of a solenoid valve for an ECAS system according to claim 2, characterized in that: the air pressure value Δ P, the waiting time t0, the air leakage threshold value L1 and the air leakage threshold value L2 can be adjusted in real time according to different air bag air pressure conditions.
7. The structural fault diagnosis method of a solenoid valve for an ECAS system according to claim 1, characterized in that: when the electromagnetic valve electrical fault occurs, the electromagnetic valve fault warning is directly sent to a driver without other diagnosis.
8. The structural fault diagnosis method of a solenoid valve for an ECAS system according to claim 2, characterized in that: when the electromagnetic valve has air leakage fault, the normal warning is sent to the driver when the air leakage is slight, and the parking warning is sent to the driver when the air leakage is serious.
9. A structural fault diagnosis method of a solenoid valve for ECAS system according to claim 3, characterized in that: and sending a common warning to the driver when the solenoid valve is slightly blocked and sending a parking warning to the driver when the solenoid valve is seriously blocked.
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| CN112147442B (en) * | 2020-09-24 | 2023-07-18 | 潍柴动力股份有限公司 | Electromagnetic valve fault detection method and device, vehicle and storage medium |
| CN112379625B (en) * | 2020-11-20 | 2021-09-14 | 广东省建筑设计研究院有限公司 | Double-layer air pillow unit internal pressure control system capable of coping with strong typhoon |
| CN112394282B (en) * | 2020-11-26 | 2021-08-27 | 安徽江淮汽车集团股份有限公司 | Carbon tank electromagnetic valve diagnosis method, device, equipment and storage medium |
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Effective date of registration: 20220321 Address after: 310058 Yuhang Tang Road, Xihu District, Hangzhou, Zhejiang 866 Patentee after: ZHEJIANG University Patentee after: Wenzhou Ruili Kemi Automotive Electronics Co., Ltd Address before: 310058 Yuhang Tang Road, Xihu District, Hangzhou, Zhejiang 866 Patentee before: ZHEJIANG University Patentee before: Ruili group Ruian Auto Parts Co., Ltd |