CN111949006B - Method for detecting and judging fault of heat dissipation system of hydrogen fuel cell vehicle - Google Patents
Method for detecting and judging fault of heat dissipation system of hydrogen fuel cell vehicle Download PDFInfo
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- CN111949006B CN111949006B CN202010761109.2A CN202010761109A CN111949006B CN 111949006 B CN111949006 B CN 111949006B CN 202010761109 A CN202010761109 A CN 202010761109A CN 111949006 B CN111949006 B CN 111949006B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0218—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults
- G05B23/0221—Preprocessing measurements, e.g. data collection rate adjustment; Standardization of measurements; Time series or signal analysis, e.g. frequency analysis or wavelets; Trustworthiness of measurements; Indexes therefor; Measurements using easily measured parameters to estimate parameters difficult to measure; Virtual sensor creation; De-noising; Sensor fusion; Unconventional preprocessing inherently present in specific fault detection methods like PCA-based methods
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Fuel Cell (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention provides a method for detecting and judging faults of a cooling system of a hydrogen fuel cell vehicle, which comprises the steps of firstly obtaining the temperature T1 of a motor controller within a certain time T1 before a finished vehicle sends out an MCU (microprogrammed control Unit) over-temperature fault alarm signal and stops the vehicle, then forcibly controlling a water pump to stop working through the finished vehicle controller and driving the vehicle at high pressure, obtaining the temperature T2 of the motor controller within a certain time T3 after the vehicle reaches a set threshold A and runs for a certain time T2, respectively fitting by taking the recorded time as an X axis, the temperature T1 of the motor controller and the temperature T2 of the motor controller as Y axes to obtain a first oblique line and a second oblique line, respectively calculating slopes to obtain delta T1 and delta T2, and finally calculating the ratio K of the delta T1 to the delta T2 to obtain a ratio KPractice ofIf K isPractice ofAnd a standard value KSign boardIf the absolute value of the difference is not greater than a set threshold value B, judging that the water pump has a fault; if KPractice ofAnd if the absolute value of the difference value with the value 1 is not greater than the set threshold value C, judging that the cooling fan has a fault. The method is simple, feasible, fast and accurate.
Description
Technical Field
The invention relates to a method for detecting and judging faults of a heat dissipation system of a hydrogen fuel cell vehicle.
Background
During normal running of the hydrogen fuel cell passenger car, the working efficiency of the motor controller is 90%, and the rest 10% is used for generating heat. In general, in order to reduce the temperature of the motor controller and avoid vehicle failure caused by over-temperature of the motor controller, a heat dissipation system is generally arranged in a vehicle. During the running process of the vehicle, the whole vehicle can send out an MCU (motor controller) over-temperature fault alarm signal due to the fault of the water pump or the cooling fan, at the moment, the motor controller moves forwards with limited power until the whole vehicle stops at high pressure, and the vehicle cannot run normally. In order to solve the problem, after-sale maintenance personnel need to judge and find out the parts with faults first to carry out targeted maintenance, but because (1) a water pump and a cooling fan of a cooling system are arranged in a chassis, the direct judgment cannot be carried out during the running of the vehicle; (2) the water pump and the cooling fan of the cooling system are controlled by the vehicle controller, the vehicle provides an enabling signal and a working power supply to feed the water pump and the cooling fan, but the water pump and the cooling fan cannot send respective working states back to the vehicle, so after-sales maintenance personnel cannot judge whether the water pump and the cooling fan work or not by collecting data; (3) because the vehicle is forced to stop due to accidental problems, when after-sale maintenance personnel go to a site for investigation, the vehicle is in a normal working state; due to the reasons, after-sale maintenance personnel cannot quickly and accurately judge which fault occurs, and can only guess and feel starting from the enabling PWM signal and the power supply wire harness of the cooling fan, much time is needed, and therefore the vehicle cannot be quickly and timely maintained, and normal operation and use of the vehicle are affected.
Disclosure of Invention
The invention aims to provide a simple, easy, quick and accurate method for detecting and judging the fault of a heat dissipation system of a hydrogen fuel cell vehicle.
The invention is realized by the following scheme:
a method for detecting and judging faults of a hydrogen fuel cell vehicle cooling system comprises the following steps that after a whole vehicle sends an MCU over-temperature fault alarm signal and stops the vehicle:
i, obtaining the temperature T1 of the motor controller within a certain time T1 before the fault alarm signal, obtaining a first oblique line by means of linear fitting with the recording time as an X axis and the temperature T1 of the motor controller as a Y axis, and calculating the slope of the first oblique line to obtain the temperature change delta T1 of the motor controller within unit time before the fault alarm signal under the condition that the problem of the unknown cooling circuit system is in fault;
II, forcibly controlling a water pump to stop working through a vehicle controller, then driving the vehicle at high pressure, acquiring the motor controller temperature T2 within a certain time T3 after the vehicle speed reaches a set threshold A and the vehicle runs for a certain time T2, performing linear fitting by taking the recording time as an X axis and the motor controller temperature T2 as a Y axis to obtain a second oblique line, and calculating the slope of the second oblique line to obtain the temperature change delta T2 of the motor controller in unit time under the condition that a cooling circuit is abnormal after a fault alarm signal;
III, calculating to obtain a ratio K of delta T1 to delta T2Practice ofNamely KPractice ofΔ T1/Δt2, if KPractice ofAnd a standard value KSign boardIf the absolute value of the difference is not greater than a set threshold B, judging that a water pump in the heat dissipation system fails; if KPractice ofAnd if the absolute value of the difference value with the value 1 is not greater than the set threshold value C, judging that the cooling fan in the cooling system has a fault.
The temperature of the motor controller is generally recorded in real time, the collected and recorded data are uploaded to a remote monitoring platform through a vehicle-mounted terminal, the temperature can be directly obtained from the remote monitoring platform, and the temperature of the motor controller is generally recorded every 20 ms. The method for forcibly controlling the water pump to stop working by the vehicle control unit can be designed according to the needs, for example, by modifying a program control instruction and the like.
Further, the total mass m1 of the circulating liquid in the whole heat dissipation system and the mass m2 of the circulating liquid which can be contained in the internal cooling circuit of the motor controller are obtained, and the ratio of m2 to m1 is used as a standard value KSign boardNamely KSign boardM2/m 1. Different vehicle models, m1 and m2 are different, the heat dissipation system corresponding to each vehicle model is designed and determined according to the heat dissipation requirement during design, the specific values of m1 and m2, m1 and m2 can be obtained by inquiring the description of the heat dissipation system of each vehicle model, and the circulating liquid is water generally.
Furthermore, the sequence of the step I and the step II can be changed.
Furthermore, the time t1 is 90-120 s, the time t2 is 5-10 min, and the time t3 is 90-120 s.
Further, the set threshold A is 20-40 Km/h, and the set threshold B is a standard value KSign board10% -16% of the threshold C, and the set threshold C is 0.10-0.15.
The method for detecting and judging the fault of the hydrogen fuel cell vehicle cooling system is simple and easy to implement, and the ratio K is finally obtained by forcibly controlling the water pump to stop workingPractice ofBy the ratio KPractice ofAnd a standard value KSign boardOr the comparison of the value 1, directly judges the component with the fault, and is rapid and accurateIndeed, the trouble shooting process that after-sale maintenance personnel blindly search after the whole vehicle sends out the MCU over-temperature trouble alarm signal is avoided, the workload is greatly reduced, the working efficiency is improved, the vehicle can be quickly repaired according to the judgment result, the risk of stopping the vehicle is avoided, and the loss is reduced.
Detailed Description
The present invention will be further described with reference to the following examples, but the present invention is not limited to the description of the examples.
Example 1
A method for detecting and judging faults of a hydrogen fuel cell vehicle cooling system comprises the following steps that after a whole vehicle sends an MCU over-temperature fault alarm signal and stops the vehicle:
i, obtaining the temperature T1 of the motor controller within a certain time T1 before the fault alarm signal, wherein the value of the time T1 is 90s, obtaining a first oblique line by taking the recording time as an X axis and the temperature T1 of the motor controller as a Y axis through linear fitting, and calculating the slope of the first oblique line to obtain the temperature change delta T1 of the motor controller within unit time before the fault alarm signal under the condition that the problem of the unknown cooling loop system is in fault;
II, forcibly controlling a water pump to stop working through a vehicle controller, then driving the vehicle at high pressure, acquiring the temperature T2 of a motor controller within a certain time T3 after the vehicle speed reaches a set threshold A and runs for a certain time T2, wherein the time T2 is 5min, the time T3 is 90s, the set threshold A is 20Km/h, and a second oblique line is obtained by linear fitting by taking the recording time as an X axis and the temperature T2 of the motor controller as a Y axis, and calculating the slope of the second oblique line to obtain the temperature change delta T2 of the motor controller in unit time under the condition that a cooling circuit is abnormal after a fault alarm signal;
III, calculating to obtain a ratio K of delta T1 to delta T2Practice of(ii) a Acquiring the total mass m1 of the circulating liquid in the whole heat dissipation system and the mass m2 of the circulating liquid which can be contained in the internal cooling loop of the motor controller, and taking the ratio of m2 to m1 as a standard value KSign board(ii) a If KPractice ofAnd a standard value KSign boardIs not more than a set threshold value B which is taken as a standard value KSign board13% of the total heat dissipation amount, heat dissipation was judgedA water pump in the system fails; if KPractice ofAnd if the absolute value of the difference value with the value 1 is not greater than a set threshold value C, and the value of the set threshold value C is 0.10, the cooling fan in the cooling system is judged to be in fault.
Example 2
A method for detecting and determining a failure in a heat dissipation system of a hydrogen fuel cell vehicle, which comprises substantially the same steps as those of the method for detecting and determining a failure in a heat dissipation system of a hydrogen fuel cell vehicle of embodiment 1, except that: the sequence of the step I is exchanged with that of the step II; the time t1 is 100s, the time t2 is 8min, the time t3 is 100s, the threshold A is set to be 30Km/h, and the threshold B is set to be a standard value KSign board15% of the threshold C, the value of the threshold C is set to 0.12.
Example 3
A method for detecting and determining a failure in a heat dissipation system of a hydrogen fuel cell vehicle, which comprises substantially the same steps as those of the method for detecting and determining a failure in a heat dissipation system of a hydrogen fuel cell vehicle of embodiment 1, except that: the time t1 is 120s, the time t2 is 10min, the time t3 is 120s, the threshold A is set to be 40Km/h, and the threshold B is set to be a standard value KSign boardAnd 16% of the threshold value C, setting the value of the threshold value C to be 0.15.
Claims (5)
1. A method for detecting and determining a failure in a heat dissipation system of a hydrogen fuel cell vehicle, characterized in that: after the whole vehicle sends out an MCU over-temperature fault alarm signal and stops, the method comprises the following steps:
i, obtaining the temperature T1 of the motor controller within a certain time T1 before the fault alarm signal, obtaining a first oblique line by means of linear fitting with the recording time as an X axis and the temperature T1 of the motor controller as a Y axis, and calculating the slope of the first oblique line to obtain the temperature change delta T1 of the motor controller within unit time before the fault alarm signal under the condition that the problem of the unknown cooling circuit system is in fault;
II, forcibly controlling a water pump to stop working through a vehicle controller, then driving the vehicle at high pressure, acquiring the motor controller temperature T2 within a certain time T3 after the vehicle speed reaches a set threshold A and the vehicle runs for a certain time T2, performing linear fitting by taking the recording time as an X axis and the motor controller temperature T2 as a Y axis to obtain a second oblique line, and calculating the slope of the second oblique line to obtain the temperature change delta T2 of the motor controller in unit time under the condition that a cooling circuit is abnormal after a fault alarm signal;
III, calculating to obtain a ratio Kactual of the delta T1 and the delta T2, and if the absolute value of the difference between the Kactual K and the standard value Kstandard is not greater than a set threshold B, judging that a water pump in the heat dissipation system breaks down; if the absolute value of the difference value between the actual K and the value 1 is not greater than a set threshold value C, judging that a cooling fan in the cooling system breaks down;
the standard value K is obtained by the following specific steps: and acquiring the total mass m1 of the circulating liquid in the whole heat dissipation system and the mass m2 of the circulating liquid which can be contained in the internal cooling circuit of the motor controller, and marking the ratio of m2 to m1 as a standard value K.
2. The detection determination method for a failure in a heat dissipation system of a hydrogen fuel cell vehicle according to claim 1, characterized in that: the sequence of the step I and the step II can be changed.
3. The method for detecting and determining a failure in a heat dissipation system of a hydrogen fuel cell vehicle according to any one of claims 1 to 2, characterized in that: the time t1 is 90-120 s, the time t2 is 5-10 min, and the time t3 is 90-120 s.
4. The method for detecting and determining a failure in a heat dissipation system of a hydrogen fuel cell vehicle according to any one of claims 1 to 2, characterized in that: the set threshold value A is 20-40 Km/h, the set threshold value B is 10% -16% of the standard value K, and the set threshold value C is 0.10-0.15.
5. The detection determination method for a failure in a heat dissipation system of a hydrogen fuel cell vehicle according to claim 3, characterized in that: the set threshold value A is 20-40 Km/h, the set threshold value B is 10% -16% of the standard value K, and the set threshold value C is 0.10-0.15.
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