基于电动直线负载模拟器的排气压力模拟研究

在电磁驱动配气机构中,排气门开启过程中受到气体压力影响,为了验证排气门控制策略的有效性,设计了一种能够模拟排气压力的电动直线加载系统。针对电动直线加载系统多余力及其他非线性扰动因素影响加载力跟踪精度问题,引入前馈补偿,以加载力作为外环,电流闭环为内环的双闭环复合PID控制策略。给定恒定力和正弦力进行直线加载跟踪性能对比分析,结果表明与传统PID控制相比,复合前馈PID控制有效抑制了加载系统的多余力。为了验证方案的可行性,建立了电动直线负载模拟平台,对排气压力模拟进行试验研究,结果表明在误差允许范围内,能够实现对排气压力的模拟。

Research on Exhaust Pressure Simulation Based on Electric Linear Load Simulator

In an electromagnetic valve actuator,the exhaust valve is affected by gas pressure during opening, to verify the effectiveness of exhaust valve control strategy, an electric linear loading system is designed for simulating the exhaust pressure. To solve the problem of force tracking accuracy which is affected by the redundant force and other nonlinear disturbance factors in the electric linear loading system, a double closed-loop PID control strategy with force as outer loop, closed-loop current as inner loop and feedforward compensation is proposed. The constant force and sinusoidal force were given and the tracking performance was contrastively analyzed. The results show that compared with the traditional PID control, the compound feedforward PID control effectively suppresses the redundant force of the loading system. In order to verify the feasibility of the scheme, the electric linear load simulation platform was established to simulate the exhaust pressure, the results show that the simulation of exhaust pressure can be realized within the allowable error range.