CN-122008867-A - Vehicle control method and system and vehicle

CN122008867ACN 122008867 ACN122008867 ACN 122008867ACN-122008867-A

Abstract

The invention discloses a control method of a vehicle, which comprises the steps of determining the configuration type of a temperature sensor assembly, carrying out multi-signal cross-validation based on the sampling temperature of a single sensor and the temperature of a normal communication module in a cooling loop of a driving system if the configuration type is the configuration type of the single sensor so as to determine whether the sampling temperature of the single sensor is reliable or not, carrying out cross-validation based on the sampling temperature of the multiple sensors if the configuration type of the single sensor is the configuration type of the single sensor so as to determine whether the sampling temperature of the multiple sensors is reliable or not, controlling the running state of an electronic fan of the vehicle based on the sampling temperature corresponding to the configuration type if the sampling temperature is reliable, otherwise, starting a fault-tolerant control strategy based on the configuration type so as to control the running state of the electronic fan of the vehicle based on the fault-tolerant temperature, thereby avoiding the problems of power limitation and function interruption of the vehicle during false alarm and the problem of noise caused by the error full turn of a cooling fan due to the inaccurate sampling temperature, and improving the driving comfort.

Inventors

WU QINGYUN
NING MINGLE
XIONG WEI
ZHOU SHENGHUI

Assignees

比亚迪股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260224

Claims (10)

1. A control method of a vehicle is characterized in that a driving system of the vehicle comprises a motor controller, a temperature sensing assembly for detecting the internal temperature of the motor controller and an electronic fan for radiating heat of the motor controller, and the method comprises the following steps: determining a configuration type of the temperature sensor assembly; If the configuration type of the temperature sensor assembly is a single-sensor configuration type, performing multi-signal cross-validation based on the sampling temperature of a single sensor and the temperature of a normally communicable module in a cooling loop of the driving system to determine whether the sampling temperature of the single sensor is reliable, or if the configuration type of the temperature sensor assembly is a multi-sensor configuration type, performing cross-validation based on the sampling temperature of a plurality of sensors to determine whether the sampling temperature of the plurality of sensors is reliable; And if the result is reliable, controlling the running state of the electronic fan of the vehicle based on the sampling temperature corresponding to the configuration type, otherwise, starting a fault-tolerant control strategy based on the configuration type, and generating a fault-tolerant temperature to control the running state of the electronic fan of the vehicle based on the fault-tolerant temperature, wherein different configuration types correspond to different fault-tolerant control strategies.
2. The method of claim 1, wherein the multi-signal cross-validation based on the single sensor sampled temperature and the temperature of a normally communicable module in a cooling circuit of the drive system to determine whether the single sensor sampled temperature is authentic, comprises: Acquiring a first absolute value of a difference between a sampling temperature of the single sensor and a temperature of a normally communicable module in a cooling circuit of the drive system; If the duration time of the first absolute value exceeding the first preset temperature difference threshold value reaches the first preset time and does not exceed the second preset time, the sampling temperature of the single sensor is judged to be unreliable, otherwise, the sampling temperature of the single sensor is judged to be reliable.
3. The control method of a vehicle according to claim 1, wherein the cross-verifying based on the sampling temperatures of the multiple sensors to determine whether the sampling temperatures of the multiple sensors are reliable includes: If the second absolute value of the difference value of any two sampling temperatures in the sampling temperatures of the multiple sensors exceeds a second preset temperature difference threshold value in a continuous preset number of sampling periods, judging that the sampling temperatures of the multiple sensors are not reliable, otherwise, judging that the sampling temperatures of the multiple sensors are reliable.
4. The control method of the vehicle according to claim 1, characterized in that the starting a fault-tolerant control strategy based on the configuration type, generating a fault-tolerant temperature, includes: when the configuration type is a single-sensor configuration type, determining a preset safety temperature as the fault-tolerant temperature; And when the configuration type is a multi-sensor configuration type, replacing the highest sampling temperature value in the sampling temperatures of the multi-sensors with a next highest sampling temperature value, and repeating the step of performing cross validation on the sampling temperatures based on the multi-sensors to determine whether the sampling temperatures of the multi-sensors are credible or not until the sampling temperatures of the multi-sensors are credible, and determining that the highest value in the sampling temperatures of the multi-sensors is the fault-tolerant temperature.
5. The control method of the vehicle according to claim 1, characterized in that the controlling the operation state of the electronic fan of the vehicle based on the sampling temperature corresponding to the configuration type includes: when the configuration type is a single-sensor configuration type, controlling the running state of the cooling fan based on the sampling temperature of the single sensor; When the configuration type is a multi-thermistor configuration type, the operation state of the cooling fan is controlled based on the highest value of the sampling temperatures of the plurality of sensors.
6. The method for controlling a vehicle according to claim 1, wherein the drive system further includes a water pump for radiating heat from the motor controller, the method further comprising: When the configuration type is a single-sensor configuration type, if the sampling temperature of the single sensor exceeds a preset temperature threshold, controlling the water pump to run at the highest rotation speed, otherwise, inquiring a preset temperature-rotation speed mapping relation to determine a first rotation speed of the water pump corresponding to the sampling temperature of the single sensor, and controlling the running state of the water pump based on the first rotation speed; When the configuration type is a multi-sensor configuration type, if the sampling temperature of any one sensor in the sampling temperatures of the multi-sensors exceeds the preset temperature threshold, controlling the water pump to operate at the highest rotating speed, otherwise, acquiring the highest sampling temperature value in the sampling temperatures of the multi-sensors, and inquiring the preset temperature-rotating speed mapping relation to determine the second rotating speed of the water pump corresponding to the highest sampling temperature value, so as to control the operation state of the water pump based on the second rotating speed.
7. The control method of a vehicle according to claim 1, characterized by further comprising, before determining the type of configuration of the temperature sensor assembly: acquiring the current power-on time of the vehicle, the last power-off time stored by the vehicle and the state of a power device of the motor controller before the current power-on of the vehicle; And if the time interval between the power-on time and the power-off time does not exceed the preset time interval and the power device of the motor controller is in a fault state before the power-on of the vehicle, executing the step of starting a fault-tolerant control strategy based on the configuration type to generate a fault-tolerant temperature so as to control the running state of the electronic fan of the vehicle based on the fault-tolerant temperature, otherwise, executing the step of determining the configuration type of the temperature sensor assembly.
8. The control method of a vehicle according to claim 1, characterized by further comprising, before determining the sampling temperature of its corresponding thermistor based on the configuration type: and determining that a high-voltage system of the vehicle is in a working state.
9. A control system of a vehicle is characterized in that the driving system of the vehicle comprises a motor controller, a temperature sensing assembly for detecting the internal temperature of the motor controller and an electronic fan for radiating heat of the motor controller, and the control system comprises: a first determination module for determining a configuration type of the temperature sensor assembly; The second determining module is used for performing multi-signal cross-validation based on the sampling temperature of a single sensor and the temperature of a normally communicable module in a cooling loop of the driving system to determine whether the sampling temperature of the single sensor is reliable or not when the configuration type of the temperature sensor assembly is a single-sensor configuration type, or performing cross-validation based on the sampling temperature of a plurality of sensors to determine whether the sampling temperature of the plurality of sensors is reliable or not when the configuration type of the temperature sensor assembly is a multi-sensor configuration type; And the control module is used for controlling the running state of the electronic fan of the vehicle based on the sampling temperature corresponding to the configuration type when the judgment result is credible, or is used for starting a fault-tolerant control strategy based on the configuration type to generate the fault-tolerant temperature when the judgment result is not credible so as to control the running state of the electronic fan of the vehicle based on the fault-tolerant temperature, wherein different configuration types correspond to different fault-tolerant control strategies.
10. A vehicle according to claim 9, comprising a control system of the vehicle; Or a processor connected to a memory storing a control program of the vehicle, which when executed by the processor implements the control method of the vehicle according to any one of claims 1-8.

Description

Vehicle control method and system and vehicle Technical Field The present invention relates to the field of vehicle technologies, and in particular, to a vehicle control method and system, and a vehicle. Background In the field of vehicles, along with the rapid popularization of new energy automobiles, the thermal management reliability of a driving system becomes a key link for guaranteeing the safety and performance of the whole vehicle, particularly, a power device in a motor controller can generate a large amount of heat in a high-frequency switching process, if the heat cannot be effectively dissipated, the temperature of the device is excessively high, and further, the performance degradation and even the thermal failure are caused. In order to solve the above problems, in the prior art, a main strategy is to monitor the resistance values and the temperature change rates of the temperature sensors on the main drive motor and the motor controller, determine abnormality when any parameter exceeds a preset range, and then take measures to limit the power of the electric drive system or shut down the system at a low speed. However, in the prior art, when temperature detection is performed, the "real overheat" and the "false alarm" cannot be distinguished, all abnormal sensor signals are regarded as overheat risks of the driving system, so that when the sensor only generates inaccurate sampling (false alarm), the vehicle can suffer unnecessary power limitation or function interruption, driving experience and vehicle usability are seriously affected, and the abnormal high temperature signals can be misjudged as serious overheat, so that under the low-speed or static working condition, the fan suddenly turns completely to generate obvious noise, and driving comfort is seriously affected. Disclosure of Invention The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present invention is to provide a vehicle control method, which can accurately determine whether the sampling temperature is reliable or not by determining the configuration type of the temperature sensor assembly and adopting different cross-validation modes under different configuration types, effectively distinguish between true overheat and false alarms, and avoid the problem that all sensor signal anomalies are regarded as overheat risks of a driving system, thereby avoiding unnecessary power limitation and function interruption problems of the vehicle and ensuring the driving continuity of the vehicle. Meanwhile, when the sampling temperature is not credible, different fault-tolerant control strategies are adopted under different sensor configuration types, so that the driving system can be ensured to normally operate in a non-overheat state, the problem of error full rotation of the cooling fan caused by inaccurate sampling temperature is fundamentally avoided, the cooling safety of the driving system is ensured, the error full rotation noise is eliminated, and the driving comfort is improved. To this end, a second object of the invention is to propose a control system for a vehicle. To this end, a third object of the invention is to propose a vehicle. In order to achieve the above purpose, the embodiment of the first aspect of the invention discloses a control method of a vehicle, wherein a driving system of the vehicle comprises a motor controller, a temperature sensing component for detecting the internal temperature of the motor controller and an electronic fan for radiating heat of the motor controller, the method comprises the steps of determining the configuration type of the temperature sensing component, if the configuration type of the temperature sensing component is a single-sensor configuration type, performing multi-signal cross-validation based on the sampling temperature of the single sensor and the temperature of a normal communication module in a cooling loop of the driving system to determine whether the sampling temperature of the single sensor is credible or performing cross-validation based on the sampling temperature of the multiple sensors to determine whether the sampling temperature of the multiple sensors is credible or not, if the configuration type of the temperature sensing component is credible, controlling the running state of the electronic fan of the vehicle based on the sampling temperature corresponding to the configuration type, if the configuration type is credible, otherwise, starting a fault-tolerant control strategy based on the configuration type to generate a fault-tolerant temperature to control the fault-tolerant temperature based on the sampling temperature of the single-sensor and the electronic fan corresponding to the running state of the vehicle, wherein the fault-tolerant control strategy is different from the running states of the electronic fan. According to the vehicle control method provided by the embodiment of