Intelligent motor system generating heat at constant offset torque in stationary vehicles

By optimizing the current trajectory and PWM method through the intelligent motor control system, the power inverter module generates waste heat when the electric vehicle is stationary, which solves the problem of low thermal management efficiency in the stationary state and achieves improved thermal management efficiency and vehicle performance.

CN116620036BActive Publication Date: 2026-02-10GM GLOBAL TECHNOLOGY OPERATIONS LLC
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Patent Information

Application Number
CN202211267679.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Priority Date
2022-02-11
Filing Date
2022-10-17
Publication Date
2026-02-10
Estimated Expiration
2042-10-17

AI Technical Summary

Technical Problem

Existing electric vehicles struggle to effectively utilize the waste heat generated by the motor system for active thermal management while maintaining the desired motor torque in a stationary state, resulting in low thermal management efficiency and increased vehicle weight and cost.

Method used

The intelligent motor control system optimizes the current trajectory and PWM method, enabling the power inverter module to operate as an electrothermal generator to generate motor waste heat, which is then converted into cooling fluid heat through the system heat exchanger, while maintaining the offset motor torque.

Benefits of technology

It improves thermal management efficiency during stationary vehicle operation, reduces vehicle weight and cost, increases driving range and fuel economy, and improves NVH performance.

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Abstract

A motor control system, vehicle, and method for generating motor heat while maintaining an offset motor torque during stationary vehicle operation is presented. A method of operating an AC motor includes a resident or remote vehicle controller receiving a mode request to operate the vehicle in a stationary mode and a temperature request including the AC motor to generate motor heat during the stationary mode of operation. The controller determines an offset motor torque to generate the motor heat while operating the vehicle in the stationary mode and maintain an output member of the AC motor at a selected position. Using a DQ transform model of the AC motor, the controller selects a plurality of dq current trajectories based on the offset motor torque, the dq current trajectories located in respective dq operating quadrants of the DQ transform model. The controller then commands a power inverter to deliver current to the AC motor based on the selected dq current trajectory.
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