中文摘要：

针对比例控制放大器的发展现状以及比例方向阀的控制需求,对数字式比例方向阀放大器控制原理进行了分析,建立了比例方向阀控制系统的数学模型,提出了一种基于ARM7微控制器和反接卸荷式功率驱动电路的数字式比例放大器。借助Visual C＋＋和ADS1.2集成开发环境,对比例放大器软件系统进行了开发,设计了上位机人机界面,实现了对比例方向阀的程序控制和闭环控制。对比例放大器各环PID参数进行了整定,利用电液比例实验与调试平台对比例方向阀系统阶跃响应和正弦波信号响应进行了测试实验。实验结果表明,系统阶跃响应调整时间较短,响应频宽较大,表现出了良好的稳定性和动态性能。

英文摘要：

Aiming at the development status of the amplifier for proportional valve and the control requirement of proportional directional valve,the control principle of digital amplifier for proportional directional valve（ DAPDV） was analyzed and the system model of proportional directional valve was established. After the theoretical analysis,a DAPDV based on ARM7 micro-controller and the technology of the inverse-relief power driver circuit was implemented. With the aid of Visual C ＋ ＋ and ADS1. 2 integrated development environment,the software system of the proportional amplifier was developed. The human-machine interface of host computer was designed,and the program control and close loop control of the proportional valve was realized. After determining the PID parameters of the proportional amplifier,the step response and sine wave signal response of the proportional directional valve system were tested on the electra-hydraulic proportional experiment rig. The results indicate that the system setting time for step response is short,the frequency response bandwidth is enough,and the designed proportional amplifier has good stability and dynamic performance.