基于dsPIC33EP256MC504的电动汽车空调压缩机控制器设计研究

Design of air conditioner compressor controller for electric vehicle based on dsPIC33EP256MC504

针对电动汽车空调制冷系统压缩机的控制需求,设计了以dsPIC33EP256MC504为核心的永磁无刷直流电机控制器,给出了其硬件设计框图,重点介绍了控制器低压电源稳压模块、电机驱动模块和运放模块等在压缩机控制应用中的电路设计内容;在电机控制策略方面,结合压缩机控制系统目标,采用矢量控制算法实现压缩机转速的控制;在程序设计方面,采用模块化的编程方式调试了压缩机控制的主程序及各个模块的子程序,并增加了CAN通信模块以实现与整车CAN网络的数据交互;最后在空调系统台架上对控制器和压缩机进行台架试验,检测在实际工况下控制器和压缩机的运转情况及空调系统的制冷情况。实验结果表明,压缩机总成正常运转,空调系统台架能够实现制冷功能,验证了设计方案的可行性。

Aiming at the control requirements of the compressor of electric vehicle air conditioning system,a permanent magnet brushless DC motor controller based on dsPIC33EP256MC504 is designed.The hardware design block diagram is given,and the circuit design content of the controller low voltage power supply voltage regulator module,motor drive module and op amp module in compressor control application is introduced.In the motor control strategy,combined with the compressor control system target,the vector control algorithm is used to control the compressor speed.In terms of programming,modular programming is used to debug the main program of the compressor control and subroutines of each module,and the CAN communication module is added to realize data interaction with the vehicle CAN network;Finally,the bench test of the controller and the compressor is carried out on the air-conditioning system gantry to detect the operation of the controller and the compressor and the refrigeration of the air-conditioning system under actual working conditions.The experimental results show that the compressor assembly can operate normally,and the air conditioning system gantry can realize the cooling function,which verifies the feasibility of the design scheme.