基于改进的PID柴油机冷却水温控制系统

摘要

According to the lower accuracy and stability of traditional PID control system, the improved PID control system was designed. The bias of parted integrall PID controler with parameter auto-tuning was used in this control system. When the bias is higher,the integral link will be opened, and stability lower and over-shoot higher will be avoided. The practical operation shows: improved PID control system can tune parameters in closed loop, and overshoot of control system is reduced, the accuracy and stability of control system are im-proved.%针对传统的PID柴油机冷却水温控制系统的控制精度较低稳定性差的现状,设计了一种改进的PID柴油机水温控制系统.该系统将积分分离PID继电自整定控制算法引入传统的柴油机水温控制系统中,在被控量与设定值偏差较大时取消积分作用,避免了由于积分作用造成的系统稳定性降低,超调量增大.应用结果表明,改进的PID控制器能在闭环状态下整定参数,降低控制系统的超调量,使系统的控制精度和稳定性得到显著提高.