Thermal protection system and method and electric drive system

By designing a thermal protection system in the automotive electric drive system, and derating the motor with the temperature acquisition and limit rate determination unit, the problem of irreversible damage caused by high temperature in the inverter circuit components is solved, ensuring that the motor and controller operate within the safe temperature range, reducing the risk of vehicle out of control.

CN119852942APending Publication Date: 2025-04-18VITESCO AUTOMOTIVE (TIANJIN) CO LTD +1
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Patent Information

Application Number
CN202311351884.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-10-16
Publication Date
2025-04-18

AI Technical Summary

Technical Problem

In automotive electric drive systems, the temperature-sensitive components of the inverter circuit are easily irreversible damage due to high temperatures, which in turn causes overtemperature failure of the motor and controller, increasing the risk of vehicle out of control.

Method used

A thermal protection system is designed to estimate the temperature of capacitors, power devices and motor windings through the temperature acquisition unit. The limit rate determination unit determines the torque limit rate based on these temperatures, and inputs the limit rate into the motor controller through the torque control unit to realize derating operation of the motor.

Benefits of technology

Effectively protect the motor and motor controller from overheating damage, ensure that the components operate within a safe temperature range, ensure that the vehicle operates stably under various working conditions, and reduce the risk of out-of-control.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention relates to a thermal protection system for an electric drive system, the electric drive system comprises a motor and a motor controller, the motor controller is used for outputting corresponding control signals to the motor based on instruction torque from the outside and comprises a capacitor and a power device, and the motor is an air-cooled motor. The thermal protection system comprises: a temperature acquisition unit configured to estimate a capacitor temperature, a device absolute temperature and a motor winding temperature, calculate a difference value between the device absolute temperature and an air inlet temperature of an air inlet of a motor controller, and take the difference value as a device relative temperature; a limit rate determination unit configured to determine a torque limit rate for derating the electric machine based on the capacitor temperature, the device absolute temperature, the device relative temperature, and the winding temperature; and a torque control unit configured to calculate a torque upper limit value based on the torque limit rate determined by the limit rate determination unit and input the calculated torque upper limit value to the motor controller. The invention further relates to an electric driving system, a thermal protection method, computer equipment and a computer readable storage medium.
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