面向新能源汽车的悬架振动能量回收在线控制方法

An efficient online control method of the electromagnetic damper damping coefficient is proposed to deal with the problem that the damping adjustment of damper in suspension of present new energy vehicle is complicated and energy consuming, and the vibration energy is recovered at the same time. The method uses an electromagnetic damper that consists of a DC motor and a ball screw mechanism. First, a damping adjustment circuit based on a high-frequency DC-DC converter is designed. Its output voltage is adjusted based on input voltage by adjusting the duty cycle of the PWM signal that drives the power MOSFET. Then the target electromagnetic torque is calculated during the working process of the damper, and the armature current required to reach the reference torque is calculated. On the other hand, the actual armature current is continuously collected during the working process, and the current is sent to a PI controller for PI closed-loop adjustment to output the duty cycle of the driving PWM signal. Finally, the PWM controller drives the DC-DC converter at an adjustment frequency of 1 kHz to achieve target torque following and energy recovery. A 1/4 suspension system experimental bench is built based on the relevant parameters of a real vehicle, and the effectiveness of the proposed damping coefficient adjustment and control method is verified. Experimental results show that the electromagnetic suspension system recovers about 184 W of vibration energy, and the response speed is up to 10 Hz.