基于模糊PID的电喷天然气发动机空燃比控制策略研究  

Research on Air-Fuel Ratio Control of Electron-Controlled CNG Engine Based on Fuzzy PID

作　　者：刘一鸣[1] 刘伟[1] 花志远[1] 陈永全[1] 

机构地区：[1]合肥工业大学机械与汽车工程学院,合肥230009

出　　处：《内燃机工程》2012年第3期14-19,共6页Chinese Internal Combustion Engine Engineering

基　　金：国家"八六三"高技术研究发展计划--节能与新能源汽车重大项目(2006AA11XK116674)

摘　　要：基于模糊PID对一台增压中冷天然气发动机进行空燃比闭环控制,对模糊控制器的隶属度函数及模糊控制规则等技术因素作了深入研究。采用自行开发的基于MC9S12DG128单片机的发动机电控系统,在NQ150N型天然气发动机上验证了控制策略的效果,其过量空气系数在暖机过程能稳定在0.99～1.01之间;在不同节气门位置过量空气系数均可以稳定在1.00±0.01,且抗扰动性强;在不同节气门位置及不同节气门变化量的瞬态工况,过量空气系数均能在1.8s内回到1附近。The air-fuel ratio control strategy of a turbocharged CNG engine based on fuzzy PID was discussed, and membership functions and the fuzzy controller rules were studied thoroughly. By using self-de- veloped ECU based on MC9S12DG128 single chip microcomputer, effect of the control strategy was validated on model NQ150N CNG engine. The air-fuel ratio can be stabilized within bound from 0.99 to 1.01 in warming process and keeps at value of 1. 00 ± 0. 01, exhibiting its strong anti-disturbance ability at different throttle positions. And the air-fuel ratio can go back approximately to 1 within 1.8 s in transient condition of different throttle positions and variations.

关 键 词：内燃机 天然气发动机 模糊PID 空燃比 MC9S12DG128单片机 瞬态工况 

分 类 号：TK464[动力工程及工程热物理—动力机械及工程]