阅读说明：本技术 一种电机温度传感器故障处理方法和装置 (motor temperature sensor fault processing method and device ) 是由 刘帅 张广利 纪秉男 于 2018-07-20 设计创作，主要内容包括：本发明提供一种电机温度传感器故障处理方法和装置,处理方法为：在电机运行过程中,检测电机冷却管道内冷却液的流量和电机冷却管道入水口的温度；如果温度传感器出现故障,则根据温度传感器发生故障时电机冷却管道内冷却液的流量和电机冷却管道入水口的温度,得到温度传感器出现故障时电机的最大坡行转矩；根据电机的最大坡行转矩对其进行控制；电机最大坡行转矩与电机冷却管道内冷却液的流量、电机冷却管道入水口的温度之间的关系根据标定试验得到。由于最大坡行转矩是车辆正常时电机的转矩,因此以此转矩对电机的运行状态进行控制,既不会因为电机的停机对车辆的安全性造成影响,也不会出现电机温度过高的问题。(The invention provides fault processing methods and devices of a motor temperature sensor, wherein the processing method comprises the steps of detecting the flow of cooling liquid in a motor cooling pipeline and the temperature of a water inlet of the motor cooling pipeline in the motor operation process, obtaining the maximum slope torque of a motor when the temperature sensor fails according to the flow of the cooling liquid in the motor cooling pipeline and the temperature of the water inlet of the motor cooling pipeline when the temperature sensor fails if the temperature sensor fails, controlling the motor according to the maximum slope torque of the motor, obtaining the relation between the maximum slope torque of the motor and the flow of the cooling liquid in the motor cooling pipeline and the temperature of the water inlet of the motor cooling pipeline according to a calibration test, and controlling the operation state of the motor according to the maximum slope torque because the maximum slope torque is the torque of the motor when a vehicle is normal, so that the safety of the vehicle cannot be affected by the shutdown of the motor, and the problem of overhigh temperature of the motor cannot occur.)

1, motor temperature sensor fault handling method, characterized by comprising the following steps:

detecting the flow of cooling liquid in a motor cooling pipeline and the temperature of a water inlet of the motor cooling pipeline in the running process of a motor;

if the temperature sensor fails, obtaining the maximum slope running torque of the motor when the temperature sensor fails according to the flow of cooling liquid in the motor cooling pipeline and the temperature of the water inlet of the motor cooling pipeline when the temperature sensor fails;

controlling the motor according to the maximum slope running torque of the motor;

and the relationship between the maximum motor gradient torque, the flow of cooling liquid in the motor cooling pipeline and the temperature of the water inlet of the motor cooling pipeline is obtained according to a calibration test.

2. The method of handling the failure of a motor temperature sensor according to claim 1, wherein the relationship between the maximum creep torque of the motor and the flow rate of the cooling fluid in the motor cooling pipe and the temperature at the inlet of the motor cooling pipe is obtained through a calibration test and stored in a data MAP table, and the maximum creep torque of the motor is obtained by searching the data MAP table after obtaining the flow rate of the cooling fluid in the motor cooling pipe and the temperature at the inlet of the motor cooling pipe when the temperature sensor fails.

3. The method of claim 2, wherein if the flow rate of the cooling liquid in the motor cooling pipe or the temperature at the inlet of the motor cooling pipe cannot be found in the data MAP table when the temperature sensor fails, the maximum creep torque of the motor is calculated according to a linear interpolation algorithm.

4. The motor temperature sensor fault handling method of claim 1, wherein the manner of controlling the motor according to its maximum creep torque is:

acquiring a required torque of the motor;

if the required torque of the motor is larger than the maximum hill-climbing torque, controlling the torque of the motor to be the maximum hill-climbing torque;

the torque of the motor is controlled to be the required torque if the required torque for the motor is less than the maximum creep torque thereof.

5, motor temperature sensor fault processing device, which comprises a processor and a memory, wherein the memory is stored with a computer program executed on the processor, and the processor executes the computer program to realize the following steps:

detecting the flow of cooling liquid in a motor cooling pipeline and the temperature of a water inlet of the motor cooling pipeline in the running process of a motor;

if the temperature sensor fails, obtaining the maximum slope running torque of the motor when the temperature sensor fails according to the flow of cooling liquid in the motor cooling pipeline and the temperature of the water inlet of the motor cooling pipeline when the temperature sensor fails;

controlling the motor according to the maximum slope running torque of the motor;

and the relationship between the maximum motor gradient torque, the flow of cooling liquid in the motor cooling pipeline and the temperature of the water inlet of the motor cooling pipeline is obtained according to a calibration test.

6. The fault handling device for the motor temperature sensor according to claim 5, wherein the relationship between the maximum creep torque of the motor and the flow rate of the cooling fluid in the motor cooling pipe and the temperature at the water inlet of the motor cooling pipe is obtained through a calibration test and stored in a data MAP table, and the maximum creep torque of the motor is obtained by searching the data MAP table after the flow rate of the cooling fluid in the motor cooling pipe and the temperature at the water inlet of the motor cooling pipe are obtained when the temperature sensor fails.

7. The fault handling device for the motor temperature sensor of claim 6, wherein if the flow rate of the cooling liquid in the motor cooling pipe or the temperature at the inlet of the motor cooling pipe cannot be found in the data MAP table when the temperature sensor fails, the maximum creep torque of the motor is calculated according to a linear interpolation algorithm.

8. The fault handling device for the motor temperature sensor, according to claim 5, wherein the means for controlling the motor according to the maximum creep torque of the motor is:

acquiring a required torque of the motor;

if the required torque of the motor is larger than the maximum hill-climbing torque, controlling the torque of the motor to be the maximum hill-climbing torque;

the torque of the motor is controlled to be the required torque if the required torque for the motor is less than the maximum creep torque thereof.

Technical Field

The invention belongs to the technical field of motor control, and particularly relates to a fault processing method and device for motor temperature sensors.

Background

With the gradual depletion of traditional energy sources such as petroleum and coal and the continuous aggravation of environmental pollution, new energy automobiles become a necessary trend for the development of the automobile industry. The motor system is a core component of the new energy automobile, and has the main functions of controlling the driving motor to work, providing power for the automobile, providing an auxiliary braking function when the automobile is braked and recycling braking energy. Therefore, the working state of the motor system directly influences the power output of the whole vehicle and the driving safety of the vehicle.

The motor can generate heat in the running process to cause the temperature of the motor to rise, the temperature of the motor has direct influence on the performance of the motor, and even irreversible demagnetization of the motor can be caused when the temperature is too high. Therefore, in order to ensure the safety of the operation of the motor, a temperature sensor for detecting the temperature of the motor and a cooling device for cooling the motor are generally provided at the motor.

The resistance value of the thermistor used as the temperature sensor is different when the temperature of the motor is different, and the resistance value of the thermistor used as the temperature sensor is corresponding to the temperature of the motor, however, the temperature sensor is likely to have faults such as short circuit or open circuit in the long-time running process of the motor, when the motor temperature sensor has open circuit fault, the resistance value of the motor temperature sensor is infinite and corresponds to a certain temperature point, and when the motor temperature sensor has short circuit fault, the resistance value of the motor temperature sensor is zero and corresponds to another temperature points, so that whether the temperature sensor has short circuit or open circuit can be judged according to the corresponding temperature points.

At present, when a temperature sensor of a motor is in short circuit or open circuit fault, the most common processing mode is to stop power output and control the motor to stop. However, for electric vehicles, especially pure electric vehicles with only driving motors as power sources, the shutdown of the motors will cause the whole vehicle not to continue to run, and the running of the whole vehicle causes serious influence; and when the motor temperature sensor breaks or short-circuit faults occur in the high-speed running state of the whole vehicle, the shutdown of the motor can cause great potential safety hazards to the vehicle.

Disclosure of Invention

The invention aims to provide motor temperature sensor fault processing methods and devices, which are used for solving the problem that in the prior art, a motor is stopped due to the fact that a temperature sensor of the motor breaks down, and further a vehicle has large potential safety hazards.

In order to achieve the purpose, the technical scheme provided by the invention is as follows:

method for processing fault of motor temperature sensor, comprising the following steps:

detecting the flow of cooling liquid in a motor cooling pipeline and the temperature of a water inlet of the motor cooling pipeline in the running process of a motor;

if the temperature sensor fails, obtaining the maximum slope running torque of the motor when the temperature sensor fails according to the flow of cooling liquid in the motor cooling pipeline and the temperature of the water inlet of the motor cooling pipeline when the temperature sensor fails;

controlling the motor according to the maximum slope running torque of the motor;

and the relationship between the maximum motor gradient torque, the flow of cooling liquid in the motor cooling pipeline and the temperature of the water inlet of the motor cooling pipeline is obtained according to a calibration test.

According to the technical scheme provided by the invention, when the temperature sensor fails, the torque of the motor is obtained according to the flow of cooling liquid in the motor cooling pipeline and the temperature of the water inlet of the motor cooling pipeline, and the motor is controlled according to the torque; because the torque is the torque of the motor when the vehicle is normal, the running state of the motor is controlled by the torque, the safety of the vehicle is not affected by the stop of the motor, and the problem of overhigh temperature of the motor is avoided.

The relation between the maximum slope running torque of the motor and the flow rate of cooling liquid in the motor cooling pipeline and the temperature of a water inlet of the motor cooling pipeline is obtained through a calibration test and stored in a data MAP table as a step improvement of a mode of obtaining the maximum slope running torque of the motor, and the maximum slope running torque of the motor is obtained through searching the data MAP table after the flow rate of the cooling liquid in the motor cooling pipeline and the temperature of the water inlet of the motor cooling pipeline are obtained when a temperature sensor fails.

As a further improvement on the method for acquiring the maximum hill-climbing torque of the motor, if the flow value of the cooling liquid in the motor cooling pipeline or the temperature value of the water inlet of the motor cooling pipeline cannot be searched in the data MAP table when the temperature sensor fails, the maximum hill-climbing torque of the motor is calculated according to a linear interpolation algorithm.

As a further improvement on the control method of the motor after the temperature sensor is failed, the method for controlling the motor according to the maximum hill-going torque of the motor comprises the following steps:

acquiring a required torque of the motor;

if the required torque of the motor is larger than the maximum hill-climbing torque, controlling the torque of the motor to be the maximum hill-climbing torque;

the torque of the motor is controlled to be the required torque if the required torque for the motor is less than the maximum creep torque thereof.

A fault handling device for a motor temperature sensor, comprising a processor and a memory, wherein the memory is stored with a computer program for being executed on the processor, and the processor executes the computer program to realize the following steps:

detecting the flow of cooling liquid in a motor cooling pipeline and the temperature of a water inlet of the motor cooling pipeline in the running process of a motor;

if the temperature sensor fails, obtaining the maximum slope running torque of the motor when the temperature sensor fails according to the flow of cooling liquid in the motor cooling pipeline and the temperature of the water inlet of the motor cooling pipeline when the temperature sensor fails;

controlling the motor according to the maximum slope running torque of the motor;

and the relationship between the maximum motor gradient torque, the flow of cooling liquid in the motor cooling pipeline and the temperature of the water inlet of the motor cooling pipeline is obtained according to a calibration test.

The relation between the maximum slope running torque of the motor and the flow rate of cooling liquid in the motor cooling pipeline and the temperature of a water inlet of the motor cooling pipeline is obtained through a calibration test and stored in a data MAP table as a step improvement of a mode of obtaining the maximum slope running torque of the motor, and the maximum slope running torque of the motor is obtained through searching the data MAP table after the flow rate of the cooling liquid in the motor cooling pipeline and the temperature of the water inlet of the motor cooling pipeline are obtained when a temperature sensor fails.

As a further improvement on the method for acquiring the maximum hill-climbing torque of the motor, if the flow value of the cooling liquid in the motor cooling pipeline or the temperature value of the water inlet of the motor cooling pipeline cannot be searched in the data MAP table when the temperature sensor fails, the maximum hill-climbing torque of the motor is calculated according to a linear interpolation algorithm.

As a further improvement on the control method of the motor after the temperature sensor is failed, the method for controlling the motor according to the maximum hill-going torque of the motor comprises the following steps:

acquiring a required torque of the motor;

if the required torque of the motor is larger than the maximum hill-climbing torque, controlling the torque of the motor to be the maximum hill-climbing torque;

the torque of the motor is controlled to be the required torque if the required torque for the motor is less than the maximum creep torque thereof.

Drawings

Fig. 1 is a flow chart of a method for handling a fault of a motor temperature sensor in a method embodiment.

Detailed Description

The invention aims to provide motor temperature sensor fault processing methods and devices, which are used for solving the problem that in the prior art, a motor is stopped due to the fact that a temperature sensor of the motor breaks down, and further a vehicle has large potential safety hazards.

In order to achieve the purpose, the technical scheme provided by the invention is as follows:

method for processing fault of motor temperature sensor, comprising the following steps:

detecting the flow of cooling liquid in a motor cooling pipeline and the temperature of a water inlet of the motor cooling pipeline in the running process of a motor;

if the temperature sensor fails, obtaining the maximum slope running torque of the motor when the temperature sensor fails according to the flow of cooling liquid in the motor cooling pipeline and the temperature of the water inlet of the motor cooling pipeline when the temperature sensor fails;

controlling the motor according to the maximum slope running torque of the motor;

and the relationship between the maximum motor gradient torque, the flow of cooling liquid in the motor cooling pipeline and the temperature of the water inlet of the motor cooling pipeline is obtained according to a calibration test.

Embodiments of the present invention are further illustrated in below with reference to the drawings.

The embodiment provides fault processing methods for a motor temperature sensor, which are used for controlling the running state of a motor when the temperature sensor of the motor has a short-circuit or open-circuit fault, so as to ensure the running safety of an electric vehicle.

The method for processing the fault of the motor temperature sensor provided by the embodiment has a flow as shown in fig. 1, and includes the following steps:

detecting the flow of cooling liquid in a motor cooling pipeline and the temperature of a water inlet of the motor cooling pipeline in the running process of a motor;

if the temperature sensor fails, obtaining the maximum slope running torque of the motor when the temperature sensor fails according to the flow of cooling liquid in the motor cooling pipeline and the temperature of the water inlet of the motor cooling pipeline when the temperature sensor fails;

controlling the motor according to the maximum slope running torque of the motor;

and the relationship between the maximum motor gradient torque, the flow of cooling liquid in the motor cooling pipeline and the temperature of the water inlet of the motor cooling pipeline is obtained according to a calibration test.

In the motor temperature sensor fault processing method, after the flow of cooling liquid in a motor cooling pipeline and the temperature of a water inlet of the motor cooling pipeline are obtained when the temperature sensor is in fault, the maximum slope running torque of the motor is obtained by searching a data MAP table;

the data MAP table stores the relationship between the motor torque and the flow of cooling liquid in the motor cooling pipeline and the temperature of the water inlet of the motor cooling pipeline; the data MAP table is obtained according to a calibration test, and the method for calibrating the data MAP table in this embodiment is as follows:

combining the minimum temperature value T1, the intermediate temperature value T2 and the maximum temperature value T3 of the water inlet temperature of the motor cooling pipeline and the minimum flow value L1, the intermediate flow value L2 and the maximum flow value L3 of the cooling liquid flow in the motor cooling pipeline in pairs to obtain 9 different working conditions;

and testing the rated torque of the motor under the 9 working conditions to obtain the maximum slope running torque of the motor under each working condition, and further obtaining the data MAP table.

Because the data MAP table in this embodiment only stores the corresponding relationship between the motor torque and the temperature of the water inlet of the cooling liquid in the motor cooling pipeline and the flow rate of the cooling liquid in the motor cooling pipeline under the condition of 9 times, but in the actual working process, when the temperature sensor fails, the temperature of the water inlet of the cooling liquid in the motor cooling pipeline and the flow rate of the cooling liquid in the motor cooling pipeline may not be consistent with the data in the data MAP table, that is, the temperature value of the water inlet of the cooling liquid in the motor cooling pipeline and the flow rate value of the cooling liquid in the motor cooling pipeline corresponding to the time when the temperature sensor fails cannot be found in the data MAP table; and calculating to obtain the maximum motor gradient torque corresponding to the water inlet temperature of the cooling liquid in the motor cooling pipeline and the flow of the cooling liquid in the motor cooling pipeline when the temperature sensor fails according to the data in the data MAP table by using a linear interpolation algorithm.

The mode for controlling the motor according to the maximum slope running torque of the motor is as follows:

determining the required torque F0 of the whole vehicle to the motor according to the running state of the vehicle;

if the torque F0 of the motor required by the whole vehicle is larger than the maximum hill-climbing torque F, controlling the torque of the motor to be the maximum hill-climbing torque F;

and if the required torque F0 of the whole vehicle to the motor is less than the maximum hill-climbing torque F, controlling the torque of the motor to be the required torque F0.

The embodiment of the device is as follows:

the embodiment provides motor temperature sensor fault processing devices, which comprise a processor and a memory, wherein the memory is stored with a computer program for being executed on the processor, and when the processor executes the computer program on the memory, the motor temperature sensor fault processing device realizes the motor temperature sensor fault processing method provided in the above method embodiment.