工程机械新型电液比例阀放大器设计

Design of a novel Electrohydraulic Proportional Valve Amplifier for Construction Machinery

适应现代工程机械向数字化、分布式控制方向发展的需求,提出一种基于微处理器和CANopen现场总线技术的电液例阀放大器设计方案。该放大器采用高频PWM驱动方式,使线圈平均电流和颤振信号独立可调;以微处理器为核心,软件协同完成电流在线检测和闭环控制;并扩展CANopen接口,实现远程参数设置、程序下载和信息反馈。具有结构简单、试方便、便于网络集成等优点。

To meet the requirements of digital and distributed control for construction machinery, we present a design scheme for electrohydraulic proportional valve amplifier based on microcontroller and CANopen techniques. In the scheme, a high frequency PWM driver is chosen to make the dither signal and the average current through the solenoid coil tunable independently, the software and hardware can co-operate together to achieve online detection and close-loop coutrol of coil current. Furthermore, a CANopen interface is implemented, which supports remote parameters configuration, program downloading and information feedback. Then, the amplifier may enjoy the merits of simple structure, convenient debugging, and easy networking.