In-wheel-motor-driven Electric Vehicles Motion Control Methods Considering Motor Thermal Protection

[+] Author and Article Information
Yimin Chen

Department of Mechanical Engineering, University of Texas at Austin, Austin, TX 78712

Junmin Wang

ASME Fellow, Department of Mechanical Engineering, University of Texas at Austin, Austin, TX 78712

1Corresponding author.

ASME doi:10.1115/1.4041359 History: Received March 31, 2018; Revised August 28, 2018


Thermal protection strategy is employed to protect in-wheel-motors in thermal fault conditions. Vehicle motion and stability maybe affected by motor thermal protection because the output torque is reduced to lower motor temperature and protect motor from thermal damage. This paper proposes a fault-tolerant control (FTC) method and a fault-prevention control (FPC) method for vehicle motion control considering motor thermal protection. The FTC method is developed to stabilize vehicle motions when motor thermal protection is triggered. A control allocation (CA) with motor temperature measurement algorithm is developed for the FTC method. The output torque constraints are changed with motor temperature to include thermal protection strategy in the controller design. When future trajectories are available, the FPC method is created to prevent motor thermal faults. A model predictive control (MPC) algorithm is used to regulate the control efforts in advance to avoid overheating in-wheel-motors and triggering the thermal protection strategy. The proposed methods are validated in CarSimĀ® simulations. The results show that both the FTC and FPC methods can eliminate the yaw rate tracking errors when in-wheel-motors are subject to thermal protection strategy.

Copyright (c) 2018 by ASME
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