Design on a chassis driving control system of vehicle carrying dead pigs

Objective  To solve the driver control problem of carrying dead pig vehicle based on high-power permanent-magnet brush DC motor.

Method  We used STM32 MCU as a main controller, used the current closed-loop control method, and built the driving control system based on high-power permanent-magnet brush DC motor through hardware circuit design. We designed motor forward and reverse control circuit, speed regulating circuit, current detection circuit and over-current protection circuit with relay as the change-over switch. The motor speed was adjusted by Pulse Width Modulation (PWM). The driving control system was tested and analyzed on vehicle carrying dead pigs.

Result  The drive system could effectively drive 1.1 kW high-power brush DC motor, and stably start with a large starting torque. The speed regulation of motor was stable with a large range. When the duty ratio of PWM ranged from 16% to 95%, the rotating speed of motor changed from low speed after stable start-up to full speed. Dual motors had good coordination, reliable isolation protection and over-current protection measure. Under the continued large current, this system could work stably, met the needs of heavy load of vehicle, and basically achieved the intended function of carrying dead pig vehicle.

Conclusion  The drive control system has start-up stability and good performance of speed regulation, which provides a solution to solve the driving problem of high-power permanent-magnet brush DC motor.