超高压共轨系统轨压控制策略研究

摘要

为稳定控制超高压共轨系统中的共轨腔压力并缩短轨压控制算法的开发周期,利用AMESim/Simulink联合仿真技术建立了超高压共轨系统轨压控制仿真模型,采取前馈+PID控制算法设计了轨压控制策略,并针对轨压控制中的瞬态和稳态工况进行了仿真计算,最后在试验台架上开展了轨压跟随性测试.结果表明:所制定的前馈+PID控制算法能使轨压稳定在目标轨压附近,上下波动小于3 MPa,且轨压突变时瞬态响应时间小于0.5 s,控制结果能够满足超高压共轨系统对精度和速度的需求.%In order to control the common rail pressure of the ultra-high pressure common rail system and shorten the development period of the rail pressure control algorithm, the rail pressure control simulation model of ultra-high pressure common rail system was established by using the AMESim/Simulink simulation technology, the rail pressure control strategy was designed with the feed-forward and PID control algorithm, the simulation calculation was carried out for the transient and steady working condition of rail pressure control, and finally the rail pressure tracing test was conducted in the test bench.The results show that the feed-forward and PID control algorithm can make the rail pressure fluctuate less than 3 MPa near the target rail pressure.Besides, the transient response time is less than 0.5 s.Accordingly, the control results can meet the precision and speed requirements of the ultra-high pressure common rail system.