模糊PID控制的电子节温器对油耗的影响

Effect of Electronic Thermostat on Fuel Consumption with Fuzzy PID

针对传统内燃机水温控制系统不能准确、快速、稳定地调节发动机水温的问题,在Simulink环境下设计了模糊控制器,建立了基于模糊比例-积分-微分(PID)控制的冷却水系统的仿真模型,对使用模糊PID控制的电子节温器与传统机械节温器进行油耗对比试验。仿真及试验结果显示:采用模糊PID控制系统比传统PID控制效果更佳,能减少水温的超调及系统调控的时间。使用模糊PID控制的电子节温器能提高发动机工作时的水温且能有效控制水温的波动,减少风扇开启时间。发动机水温升高能降低发动机的油耗,在新欧洲行驶循环(NEDC)工况下,其节油效率为0.7%;低速小负荷稳态工况下,其节油效率最高可达4.7%。

Aiming at the problem that the traditional internal combustion engine water temperature control system could not accurately,quickly and steadily adjust the engine water temperature,a fuzzy controller was designed in Simulink environment,and a simulation model of cooling water system based on fuzzy proportion integration and derivation( PID) control was established. The simulation and experiment results indicate that the fuzzy PID control system is better than the traditional PID control,which can reduce the water temperature overshoot and the system control time. The electronic thermostat controlled by fuzzy PID can improve the water temperature and effectively control the working water temperature of the engine. The fan opening time is reduced. Engine water temperature rising can reduce the fuel consumption of the engine. In the new European driving cycle( NEDC),electronic thermostat fuel saving efficiency is 0. 7%. Under low-speed and small load steady-state conditions,its fuel saving efficiency is up to 4. 7%.