Over temperature protection method for ISG (Integrated Starter Generator) of hybrid electric vehicle

Abstract

The invention discloses an over temperature protection method for an ISG (Integrated Starter Generator) of a hybrid electric vehicle. When the ISG is about to achieve a temperature threshold value, the purpose of preventing the ISG from being burnt due to overhigh temperature is achieved by virtue of restricting the power of the ISG. By virtue of the motor, ISG over temperature protection is timely and effective, and charge and discharge performances of an entire-vehicle power battery are slightly influenced.

Description

technical field [0001] The invention belongs to the field of motor system safety protection functions, and is suitable for an ISG motor overtemperature protection system of a hybrid electric vehicle. Background technique [0002] At present, the application of new energy hybrid power systems is becoming more and more extensive. As a key component of new energy hybrid power systems, the motor must ensure the safety and reliability of the motor. When the motor is working, part of the electrical energy is converted into mechanical energy output, and part of it is converted into Thermal energy, heat is transmitted to the air or other media through the motor material, if the large amount of heat generated by the continuous operation of the motor accumulates to a certain extent, the motor may be burned. [0003] The existing method to protect the motor temperature from being too high is: if the temperature of the motor reaches the warning threshold, directly reduce the maximum out...

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Problems solved by technology

[0003] The existing method to protect the motor temperature from being too high is: if the temperature of the motor reaches the warning threshold, directly reduce the maximum output power of the motor to half of the maximum design value, and if the temperature of the motor cannot be controlled after reducing the output power , the temperature of the motor rises to the maximum allowable operating temperature of the motor. At this time, it is considered that the motor has a serious heat dissipation problem, and the motor is controlled to be turned off. After the motor is turned off, the hybrid power system will also fail

In a hybrid system, the motor may need to output a large power for a short time, and the temperature of the motor will rise accordingly. If the temperature exceeds the warning threshold, the output power of the motor will be directly limited to half, and the fluctuation of the adjustment is too large. Large, so that the hybrid system cannot obtain continuous and smooth power output, and it is easy to cause over-protection to the motor

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