A fault warning method and device for a vehicle and an electric drive cooling system thereof

Abstract

The present invention provides a vehicle and a method and device for fault warning of an electric drive cooling system, belonging to the field of new energy vehicles. The method includes: during the operation of the electric drive cooling system, acquiring the temperature, speed and torque of the drive motor in real time; when the drive motor speed > n1 and the drive motor torque > N1, judging the magnitude of the drive motor temperature at a set time interval within a set time period for multiple times, and counting the number of times B1 that the drive motor temperature > T1 within the set time period and the total number of judgments A1 within the set time period; when B1 > B10, calculating the high temperature ratio P1 of the drive motor = B1 / A1; when P1 > P10, determining that the cooling fan and the cooling water tank in the electric drive cooling system are abnormal and giving a warning. The present invention can accurately identify the abnormality of the cooling fan and the cooling water tank in the electric drive cooling system and realize the fault warning of the electric drive cooling system.

Description

Technical Field

[0001] The invention relates to a fault early warning method and device for a vehicle and an electric drive cooling system thereof, belonging to the field of new energy vehicles. Background Art

[0002] With the depletion of traditional energy sources such as oil and coal and the increasing environmental pollution, new energy vehicles have become an inevitable trend in the development of the automotive industry. The electric drive system (including motor controller and drive motor) is the core component of new energy vehicles. Its main function is to use the motor controller to control the drive motor to provide power for the vehicle, and to provide auxiliary braking function when the vehicle brakes to recycle the braking energy.

[0003] The working state of the electric drive system directly affects the power output of the whole vehicle and the driving safety of new energy vehicles. Among them, the temperature of the electric drive system directly affects the performance of the electric drive system. If the temperature of the drive motor is too high, it will cause irreversible demagnetization of the drive motor. If the temperature of the motor controller is too high, it will cause damage to the power module of the motor controller. At present, the cooling system of the electric drive system (referred to as the electric drive cooling system, including cooling water pumps, cooling water tanks, cooling fans, cooling water pipes, etc.) is generally used to cool the electric drive system, so as to ensure that the temperature of the electric drive system can be kept within the normal range when it is working. However, when the electric drive cooling system is abnormal, it is impossible to cool the electric drive system. At this time, there is a risk of overheating when the electric drive system is working. Summary of the invention

[0004] The object of the present invention is to provide a fault warning method and device for a vehicle and an electric drive cooling system thereof, which can timely detect abnormalities of the electric drive cooling system and issue a warning.

[0005] In order to achieve the above object, the present invention provides a fault warning method for an electric drive cooling system, the method comprising the following steps:

[0006] During the operation of the electric drive cooling system, the drive motor temperature, drive motor speed and drive motor torque are obtained in real time;

[0007] When the driving motor speed is greater than n1 and the driving motor torque is greater than N1, the driving motor temperature is judged multiple times at set time intervals within a set time period, and the number of times B1 when the driving motor temperature is greater than T1 within the set time period and the total number of judgments A1 within the set time period are counted;

[0008] When B1>B1 0 When the high temperature ratio of the drive motor is calculated, P1 = B1 / A1;

[0009] When P1>P1 0When the cooling fan and cooling water tank in the electric drive cooling system are abnormal, an early warning is issued;

[0010] n1 is the first speed setting value, N1 is the first torque setting value, T1 is the first temperature setting value, B1 0 The first upper limit value, P1 0 It is the upper limit value of the motor high temperature ratio.

[0011] The beneficial effects of the fault warning method of the electric drive cooling system are: first, the working condition is judged, and the temperature of the drive motor is judged only when the drive motor speed is greater than n1 and the drive motor torque is greater than N1; then, the temperature distribution trend analysis is performed based on the statistical number of times B1 when the drive motor temperature is greater than T1 within a certain set time period, and the cooling fan and the cooling water tank are judged to be abnormal by calculating the proportion P1 of the number of times B1 when the drive motor temperature is greater than T1 to the total number of judgments A1, so that the abnormalities of the cooling fan and the cooling water tank in the electric drive cooling system can be accurately identified, and the fault warning of the electric drive cooling system can be realized.

[0012] Furthermore, in the above method, the method also obtains the temperature of the motor controller in real time during the operation of the electric drive cooling system. When the drive motor speed is greater than n2 and the drive motor torque is greater than N2, the temperature difference between the motor controller temperature and the drive motor temperature is judged multiple times at set time intervals within a set time period, and the number of times (motor controller temperature-drive motor temperature)>T2 within the set time period is counted B2 and the total number of judgments within the set time period is A2;

[0013] When B2>B2 0 When the motor controller high temperature ratio P2 is calculated as B2 / A2;

[0014] When P2>P2 0 When the cooling water pump in the electric drive cooling system is abnormal, it is determined that the cooling water pump is abnormal and an early warning is issued;

[0015] n2 is the second speed setting value, N2 is the second torque setting value, T2 is the second temperature setting value, B2 0 The second upper limit value, P2 0 It is the upper limit value of the high temperature ratio of the motor controller.

[0016] The beneficial effects of doing so are: first, the working conditions are judged, and only when the drive motor speed is greater than n2 and the drive motor torque is greater than N2, the temperature difference between the motor controller temperature and the drive motor temperature is judged; based on the statistical number of times B2 when (motor controller temperature-drive motor temperature)>T2 within a certain set time period, the temperature difference distribution trend analysis is performed, and the cooling water pump abnormality is judged by calculating the proportion P2 of the number of times B2 when (motor controller temperature-drive motor temperature)>T2 to the total number of judgments A2, so as to accurately identify the cooling water pump abnormality in the electric drive cooling system.

[0017] Furthermore, in the above method, when it is determined that the cooling fan and the cooling water tank in the electric drive cooling system are abnormal, the vehicle's unique identification number is obtained and pushed to relevant personnel to remind the relevant personnel to perform advance maintenance on the vehicle's cooling fan and cooling water tank.

[0018] Furthermore, in the above method, when it is determined that the cooling water pump in the electric drive cooling system is abnormal, the vehicle unique identification number is obtained and pushed to relevant personnel to remind the relevant personnel to perform early maintenance on the cooling water pump of the vehicle.

[0019] The present invention also provides another fault warning method for an electric drive cooling system, the method comprising the following steps:

[0020] During the operation of the electric drive cooling system, the motor controller temperature, drive motor temperature, drive motor speed and drive motor torque are obtained in real time;

[0021] When the driving motor speed is greater than n2 and the driving motor torque is greater than N2, the temperature difference between the motor controller temperature and the driving motor temperature is judged multiple times at set time intervals within a set time period, and the number of times (motor controller temperature-driving motor temperature)>T2 within the set time period and the total number of judgments within the set time period A2 are counted;

[0022] When B2>B2 0 When the motor controller high temperature ratio P2 is calculated as B2 / A2;

[0023] When P2>P2 0 When the cooling water pump in the electric drive cooling system is abnormal, it is determined that the cooling water pump is abnormal and an early warning is issued;

[0024] n2 is the second speed setting value, N2 is the second torque setting value, T2 is the second temperature setting value, B2 0 The second upper limit value, P2 0 It is the upper limit value of the high temperature ratio of the motor controller.

[0025] The beneficial effect of the fault warning method of the electric drive cooling system is that it can accurately identify the abnormality of the cooling water pump in the electric drive cooling system and realize the fault warning of the electric drive cooling system.

[0026] Furthermore, in the above method, when it is determined that the cooling water pump in the electric drive cooling system is abnormal, the vehicle unique identification number is obtained and pushed to relevant personnel to remind the relevant personnel to perform early maintenance on the cooling water pump of the vehicle.

[0027] The present invention also provides a fault warning device for an electric drive cooling system, the device comprising a processor and a memory, the processor executing a computer program stored in the memory to implement the above-mentioned fault warning method for the electric drive cooling system.

[0028] The beneficial effect of the fault warning device of the electric drive cooling system is that it can accurately identify the failed components of the electric drive cooling system and realize the fault warning of the electric drive cooling system.

[0029] The present invention also provides a vehicle, comprising a vehicle body, an electric drive system, an electric drive cooling system and a fault warning device for the electric drive cooling system, wherein the electric drive system and the electric drive cooling system are installed on the vehicle body, and the fault warning device for the electric drive cooling system comprises a processor and a memory, and the processor executes a computer program stored in the memory to implement the above-mentioned fault warning method for the electric drive cooling system.

[0030] The beneficial effect of the vehicle is that the fault warning device of the electric drive cooling system can accurately identify the failed components of the electric drive cooling system and realize the fault warning of the electric drive cooling system. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a flow chart of abnormality determination of cooling fan and cooling water tank in a vehicle embodiment of the present invention;

[0032] Figure 2 It is a flow chart for determining abnormality of a cooling water pump in a vehicle embodiment of the present invention. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0034] Vehicle Example:

[0035] The vehicle of this embodiment includes a vehicle body, an electric drive system, an electric drive cooling system and a fault warning device for the electric drive cooling system, and the electric drive system and the electric drive cooling system are installed on the vehicle body; wherein the electric drive system includes a motor controller and a drive motor, and the electric drive cooling system includes a cooling water pump, a cooling fan and a cooling water tank.

[0036] The fault warning device of the electric drive cooling system of this embodiment can implement a fault warning method of the electric drive cooling system. The method can accurately identify failed components of the electric drive cooling system according to the motor controller temperature, the drive motor temperature, the drive motor speed and the drive motor torque, thereby realizing fault warning of the electric drive cooling system.

[0037] The fault warning method of the electric drive cooling system of this embodiment includes the following steps:

[0038] Step 1: During the operation of the electric drive cooling system, the motor controller temperature, the drive motor temperature, the drive motor speed and the drive motor torque are obtained in real time;

[0039] Step 2: When the speed of the driving motor is greater than the speed setting value and the torque of the driving motor is greater than the torque setting value, the temperature of the driving motor and the temperature difference between the temperature of the motor controller and the temperature of the driving motor are judged multiple times at set time intervals within a set time period, and the judgment results are statistically analyzed to realize fault warning of the electric drive cooling system;

[0040] Among them, the length of the set time period and the set time interval can be adjusted according to actual needs. For example, when the set time period is 30 minutes and the set time interval is 1 minute, when the drive motor speed is greater than the speed setting value and the drive motor torque is greater than the torque setting value, the drive motor temperature and the temperature difference between the motor controller temperature and the drive motor temperature are judged every 1 minute within a certain 30 minutes, and a total of 30 judgments are made within this 30 minutes. The results of these 30 judgments are statistically analyzed, and whether the components in the current electric drive cooling system are abnormal is judged based on the statistical results within this 30 minutes. If abnormal, an early warning is issued. If no abnormality is observed, the above process is repeated within the next 30 minutes, and so on. The above process is repeated during the operation of the electric drive cooling system to achieve a fault early warning of the electric drive cooling system.

[0041] It should be noted that, under the condition that the vehicle's running speed is greater than the creeping speed, the fault warning method of the electric drive cooling system of this embodiment is more effective.

[0042] Taking the execution of the above process in one of the set time periods as an example, the process of using the statistical results in the set time period to determine whether the components in the current electric drive cooling system are abnormal is described in detail as follows:

[0043] (1) Cooling fan and cooling water tank abnormal warning, the specific process is as follows Figure 1 As shown:

[0044] When the driving motor speed is greater than n1 and the driving motor torque is greater than N1, the driving motor temperature is judged multiple times at set time intervals within a set time period, and the number of times B1 when the driving motor temperature is greater than T1 within the set time period and the total number of judgments A1 within the set time period are counted;

[0045] When B1>B1 0 When the high temperature ratio of the drive motor is calculated, P1 = B1 / A1;

[0046] When P1>P1 0 When the cooling fan and cooling water tank in the electric drive cooling system are abnormal, an early warning is issued.

[0047] Among them, n1 is the first speed setting value, N1 is the first torque setting value, T1 is the first temperature setting value, B1 0 The first upper limit value, P1 0 It is the upper limit value of the motor high temperature ratio.

[0048] Specifically, the first speed setting value n1 is determined according to the tire size of the vehicle and the speed ratio of the vehicle at the creeping speed; the first torque setting value N1 is usually set to 10% of the maximum torque of the drive motor, and can be adjusted according to the actual situation in actual applications; the first temperature setting value T1 is determined according to the motor model, and in this embodiment, T1 = 100°C. 0 、P1 0 The two values ​​are determined based on a large amount of market feedback data for the corresponding models. In the early stage, B1 0 、P1 0 The values ​​of are set to corresponding empirical values, and then the two values ​​are used to judge the abnormality of cooling fans and cooling water tanks on vehicles put on the market, and the conformity rate between the abnormality judgment results and the actual abnormal conditions is judged. If the conformity rate meets the accuracy requirements, it indicates that the two values ​​are reasonably set. If not, the two values ​​are adjusted until the conformity rate meets the accuracy requirements.

[0049] (2) Cooling water pump abnormal warning, the specific process is as follows Figure 2 As shown:

[0050] When the driving motor speed is greater than n2 and the driving motor torque is greater than N2, the temperature difference between the motor controller temperature and the driving motor temperature is judged multiple times at set time intervals within a set time period, and the number of times (motor controller temperature-driving motor temperature)>T2 within the set time period and the total number of judgments within the set time period A2 are counted;

[0051] When B2>B2 0 When the motor controller high temperature ratio P2 is calculated as B2 / A2;

[0052] When P2>P2 0 When the cooling water pump in the electric drive cooling system is abnormal, it is determined that the cooling water pump is abnormal and an early warning is issued.

[0053] Wherein, n2 is the second speed setting value, N2 is the second torque setting value, T2 is the second temperature setting value, B2 0 The second upper limit value, P2 0 It is the upper limit value of the high temperature ratio of the motor controller.

[0054] In actual use, n2=n1 and N2=N1 can be taken. As other implementations, the values ​​of n2 and N2 can be set by referring to the value of n1 and N1, and are not limited to n2=n1 and N2=N1. The value of T2 is different for different models. In this embodiment, T2=50℃ is taken. B2 of different models 0 、P2 0 Different values, B2 0 、P2 0 The value of B1 is the same as 0 、P1 0 The value of is similar and will not be described here.

[0055] Step 3. When it is determined that the cooling fan and cooling water tank in the electric drive cooling system are abnormal, the vehicle unique identification number is obtained, and the vehicle unique identification number is pushed to relevant personnel (including the driver or operation and maintenance personnel), reminding the relevant personnel to perform early maintenance on the cooling fan and cooling water tank of the vehicle; when it is determined that the cooling water pump in the electric drive cooling system is abnormal, the vehicle unique identification number is obtained, and the vehicle unique identification number is pushed to relevant personnel, reminding the relevant personnel to perform early maintenance on the cooling water pump of the vehicle.

[0056] In summary, the fault warning method for the electric drive cooling system of the present embodiment first judges the working condition. Only when the driving motor speed is greater than the speed setting value and the driving motor torque is greater than the torque setting value, the driving motor temperature and the temperature difference between the motor controller temperature and the driving motor temperature are judged; then, based on the number of times B1 of the driving motor temperature greater than T1 obtained by statistics within a certain set time period, the temperature distribution trend analysis is performed, and the cooling fan and the cooling water tank are judged to be abnormal by calculating the proportion P1 of the number of times B1 of the driving motor temperature greater than T1 to the total number of judgments A1; based on the number of times B1 of the driving motor temperature greater than T1 obtained by statistics within a certain set time period (motor controller The temperature difference distribution trend is analyzed by calculating the number of times B2 when (motor controller temperature - drive motor temperature)>T2, and the cooling water pump is judged to be abnormal by calculating the proportion P2 of the number of times B2 when (motor controller temperature - drive motor temperature)>T2 to the total number of judgments A2. The failed components of the electric drive cooling system can be accurately identified, and the electric drive cooling system fault warning can be realized; moreover, the abnormal vehicle information of the electric drive cooling system can be identified and extracted, and the vehicle unique identification number information can be pushed to the relevant personnel, so as to remind the relevant personnel to perform early maintenance on the vehicle's electric drive cooling system, so as to avoid the vehicle power interruption or even breakdown due to the failure of the electric drive cooling system.

[0057] In this embodiment, the whole vehicle monitoring platform is used as a fault warning device for the electric drive cooling system. The electric drive system uploads information such as the motor controller temperature, the drive motor temperature, the drive motor speed, the drive motor torque, and the vehicle unique identification number to the whole vehicle monitoring platform through the CAN communication system. The whole vehicle monitoring platform implements the above-mentioned fault warning method for the electric drive cooling system. At the same time, by obtaining the vehicle unique identification number, the whole vehicle monitoring platform can monitor multiple vehicles at the same time. The vehicle unique identification number can be used to determine which vehicle has a fault in the electric drive cooling system. This is suitable for multiple bus operation scenarios.

[0058] As another embodiment, a fault warning device for an electric drive cooling system may be separately provided on the vehicle, so that the fault warning method for the electric drive cooling system may be implemented locally in the vehicle, and each vehicle determines by itself whether the electric drive cooling system of the vehicle is faulty, without obtaining a unique vehicle identification number. As long as the fault warning device for the electric drive cooling system includes a processor and a memory, and a computer program that can be run on the processor is stored in the memory, the processor may implement the above-mentioned fault warning method for the electric drive cooling system when executing the computer program.

[0059] The processor refers to a processing device such as a microprocessor MCU or a programmable logic device FPGA.

[0060] Memory includes physical devices for storing information, usually digitizing the information and then storing it in media using electrical, magnetic or optical methods. For example: various memories that use electrical energy to store information, such as RAM, ROM, etc.; various memories that use magnetic energy to store information, such as hard disks, floppy disks, tapes, magnetic core memories, bubble memories, and USB flash drives; various memories that use optical methods to store information, such as CDs or DVDs. Of course, there are other types of memory, such as quantum memory, graphene memory, etc.

[0061] The device is composed of the above-mentioned memory, processor and computer program, and is implemented by the processor executing corresponding program instructions in the computer. The processor can be equipped with various operating systems, such as Windows operating system, Linux system, Android, iOS system, etc.

[0062] The fault warning method of the electric drive cooling system of the present embodiment can realize the abnormal warning of the cooling fan and the cooling water tank and the abnormal warning of the cooling water pump at the same time; as other implementation methods, the fault warning method of the electric drive cooling system can also only retain the abnormal warning method of the cooling fan and the cooling water tank or only retain the abnormal warning method of the cooling water pump according to actual needs.

[0063] Method Example:

[0064] The fault warning method of the electric drive cooling system of this embodiment is the same as the fault warning method of the electric drive cooling system in the vehicle embodiment, and will not be repeated here.

[0065] Device Example:

[0066] The fault warning device of the electric drive cooling system of this embodiment is the same as the fault warning device of the electric drive cooling system in the vehicle embodiment, and will not be described in detail here.

Claims

1. A fault warning method for an electric drive cooling system, characterized in that: The method comprises the following steps: During the operation of the electric drive cooling system, the drive motor temperature, motor controller temperature, drive motor speed and drive motor torque are obtained in real time; When the driving motor speed is greater than n1 and the driving motor torque is greater than N1, the driving motor temperature is judged multiple times at set time intervals within a set time period, and the number of times B1 when the driving motor temperature is greater than T1 within the set time period and the total number of judgments A1 within the set time period are counted; When B1>B10, the high temperature ratio of the drive motor is calculated as P1=B1 / A1; When P1>P10, the cooling fan and cooling water tank in the electric drive cooling system are judged to be abnormal, and an early warning is issued; The n1 is the first speed setting value, N1 is the first torque setting value, T1 is the first temperature setting value, B10 is the set first number upper limit value, and P10 is the set motor high temperature ratio upper limit value; When the driving motor speed is greater than n2 and the driving motor torque is greater than N2, the temperature difference between the motor controller temperature and the driving motor temperature is judged multiple times at set time intervals within a set time period, and the number of times (motor controller temperature-driving motor temperature)>T2 within the set time period and the total number of judgments within the set time period A2 are counted; When B2>B20, calculate the motor controller high temperature ratio P2=B2 / A2; When P2>P20, the cooling water pump in the electric drive cooling system is judged to be abnormal and an early warning is issued; The n2 is the second speed setting value, N2 is the second torque setting value, T2 is the second temperature setting value, B20 is the set second number upper limit value, and P20 is the set motor controller high temperature ratio upper limit value.

2. The fault warning method of the electric drive cooling system according to claim 1, characterized in that: When it is determined that the cooling fan and the cooling water tank in the electric drive cooling system are abnormal, the vehicle's unique identification number is obtained and pushed to relevant personnel to remind them to perform advance maintenance on the vehicle's cooling fan and the cooling water tank.

3. The fault warning method of the electric drive cooling system according to claim 1, characterized in that: When it is determined that the cooling water pump in the electric drive cooling system is abnormal, the vehicle unique identification number is obtained and pushed to relevant personnel to remind the relevant personnel to perform early maintenance on the cooling water pump of the vehicle.

4. A fault warning method for an electric drive cooling system, characterized in that: The method comprises the following steps: During the operation of the electric drive cooling system, the motor controller temperature, drive motor temperature, drive motor speed and drive motor torque are obtained in real time; When the driving motor speed is greater than n2 and the driving motor torque is greater than N2, the temperature difference between the motor controller temperature and the driving motor temperature is judged multiple times at set time intervals within a set time period, and the number of times (motor controller temperature-driving motor temperature)>T2 within the set time period and the total number of judgments within the set time period A2 are counted; When B2>B20, calculate the motor controller high temperature ratio P2=B2 / A2; When P2>P20, the cooling water pump in the electric drive cooling system is judged to be abnormal and an early warning is issued; The n2 is the second speed setting value, N2 is the second torque setting value, T2 is the second temperature setting value, B20 is the set second number upper limit value, and P20 is the set motor controller high temperature ratio upper limit value.

5. The fault warning method of the electric drive cooling system according to claim 4, characterized in that: When it is determined that the cooling water pump in the electric drive cooling system is abnormal, the vehicle unique identification number is obtained and pushed to relevant personnel to remind the relevant personnel to perform early maintenance on the cooling water pump of the vehicle.

6. A fault warning device for an electric drive cooling system, characterized in that: The device comprises a processor and a memory, wherein the processor executes a computer program stored in the memory to implement the fault warning method of the electric drive cooling system according to any one of claims 1 to 5.

7. A vehicle, comprising a vehicle body, an electric drive system, an electric drive cooling system and a fault warning device for the electric drive cooling system, wherein the electric drive system and the electric drive cooling system are mounted on the vehicle body, characterized in that: The fault warning device of the electric drive cooling system includes a processor and a memory, and the processor executes a computer program stored in the memory to implement the fault warning method of the electric drive cooling system according to any one of claims 1 to 5.

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