基于单片机的电控发动机怠速模糊控制器实现

Realization of Engine Idle-speed Fuzzy Controller Based on SCM

针对发动机怠速工况显著的时变性、非线性和不确定性,以80C196KC单片机作为控制器,设计了一种以发动机转速偏差及偏差变化为模糊输入、以旁通电磁阀占空比和点火提前角为模糊输出的模糊控制器.实验结果表明,该模糊控制实现了稳定怠速控制,且与原系统相比,降低了怠速目标转速,并具有更好的冷却水温适应性.

In view of the significant features of being non-linear, time-varying and uncertain on the part of the engine idling condition, a fuzzy controller is designed based on 80C196KC singlechip microcomputer（SCM）. The double fuzzy inputs are engine speed deviation and its change, while the double fuzzy outputs are duty ratio of the bypass electromagnetic valve and ignition advance angle. Experimental results show that the fuzzy controller realizes the stable idle-speed control and has smaller idle speed target, better adaptability to cooling water temperature.