SYSTEM AND METHOD FOR CONTROLLING MOTOR OF ELECTRIC VEHICLE

• Main Authors: HAN SOO LIM, KO KYU BEOM
• Format: Patent
• Language: English; Korean
• Published: 17.08.2022
• Subjects: ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ELECTRIC EQUIPMENT OR PROPULSION OF ELECTRICALLY-PROPELLEDVEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES, IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; PERFORMING OPERATIONS; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OFVEHICLES; TRANSPORTING; VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES; VEHICLES IN GENERAL

The present invention relates to a motor toque and speed control system of an electric automobile and a method thereof. According to the present invention, when a motor speed of the electric automobile exceeds a standard maximum speed, a motor torque is controlled as a negative torque value for regenerative braking. Therefore, the motor speed is maintained at a standard maximum speed level. Alternatively, if the motor torque exceeds the standard maximum speed even after being controlled as the negative torque value for the regenerative braking, the motor torque is controlled as the negative torque value which is determined again according to a weight of a vehicle. Therefore, the motor speed is maintained at the standard maximum speed level. As a result, a phenomenon in which the motor speed exceeds the standard maximum speed and diverges may be prevented, and motor burnout due to motor overrun may be prevented. The motor torque and speed control system of the electric automobile of the present invention comprises: a motor speed detecting unit; a weight estimating unit; and a motor controller. 본 발명은 전기자동차의 모터 속도가 기준 최고속도를 초과하면 모터 토크를 회생제동을 위한 음의 토크값으로 제어하여 모터 속도가 기준 최고속도 수준으로 유지되도록 하거나, 모터 토크를 회생제동을 위한 음의 토크값으로 제어한 후에도 기준 최고속도를 초과하면 모터 토크를 차량 중량에 따라 다시 결정되는 음의 토크값으로 제어하여 모터 속도가 기준 최고속도 수준으로 유지되도록 함으로써, 모터 속도가 기준 최고속도를 초과하여 발산하는 현상을 방지하는 동시에 모터 오버런에 따른 모터 소손을 방지할 수 있도록 한 전기자동차의 모터 토크 및 속도 제어 시스템 및 방법을 제공하고자 한 것이다.