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Vector control is a most widely used control method for induction motor (IM) of electric vehicle (EV). However, the EV battery voltage will rapidly drop to the under-voltage protection point, if the IM torque is output without any limited, especially when the EV battery level is insufficient. As a result, the under-voltage protection of IM driving system would be trigger in advance and the EV endurance will be seriously affected. To address this issue, a vector control method for EV under the constraint of battery output power is proposed. Based on the traditional vector control strategy, this method introduces the closed-loop control of battery output power and combines the power limit curve associated with motor speed and battery voltage to constrain the battery output power. The experimental results show that the proposed vector control method can effectively prevent premature under-voltage protection caused by excessive battery output current, and is helpful to improve the endurance of electric vehicles. Introduction In recent years, with the aggravation of energy crisis and environmental pollution, the electric vehicle industry has developed vigorously [1]. IM has become one of the most widely used driving motors of EV, especially for low-speed EV. It is of great significance to study the drive control method of IM for improving vehicle operation performance. The most widely used algorithm in IM is magnetic field-oriented control (FOC). The core idea of FOC is to decompose the stator current into torque current and excitation current components that can be independently controlled by the means of coordinate transformation. As a result, the IM can obtain good dynamic characteristics that similar to the DC motor [2-4]. In order to further improve the control performance, the IM vector control method is being improved. As found in [5], an indirect vector control method of IM based on parameter online correction is proposed, which improved the torque control performance of the motor. The authors [6] apply single-neuron control to the IM vector control system, which improves the vector control performance of the IM and has strong adaptability and robustness. To achieve the same driving experience as traditional cars, the IM vector control is usually realized based on torque closed-loop control method. If the motor torque remains constant during the running of an EV, the motor power will increase with the increase of the motor speed. As a result, the output current and power of the EV battery will increase at the same time. Under the influence of internal resistance and discharge characteristics, the battery voltage will decrease with the increase of the output current. The excessive output current will lead to a serious drop in battery voltage, which will cause the under-voltage protection of the motor drive system to be triggered prematurely and force the vehicle to stop. Therefore, this paper proposes a vector control method of EV motor under the constraint of battery output power. Experimental results show the effectiveness of the proposed method.

Vector Control Method for Induction Motor of Electric Vehicle under the Constraint of Battery Output Power