针对基于PID和比例伺服阀的控制装备存在过冲、反应时间长等问题,研发基于PLC和高速开关电磁阀的节流压力控制系统.介绍系统的主要组成及功能,建立压力控制数学模型,分析系统动态响应特性,并通过压力控制试验和压力阶跃试验检验系统的灵敏度与可靠性.结果表明:压力控制误差在±0.3 MPa以内,压力跟随效果优异；在改变控制压力和流量的试验条件下系统具有较高的灵敏度和可靠性.%The control system with PID and proportional servo valve has the defects of overshorting and long response time. A PLC and high-speed switch electromagnetic valve were used in the improved design. The components and its function of newly designed throttle pressure control device were introduced. A pressure control mathematical model was presented, and the dynamic response characteristics of this system were analyzed. The sensitivity and reliability of this system were tested and verified by pressure control and pressure step experiments. The results show that the pressure control fluctuations are less than ?0. 3 MPa. The pressure following effect is good. The pressure control system has high sensitivity and reliability under the experimental conditions of changing control pressure and flow rate.
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