多点喷射点燃式天然气发动机电控系统研究  

Research of an Electronic CNG Engine Control System

作　　者：李涛[1] 陈永义[1] 张幽彤[1] 

机构地区：[1]北京理工大学机械与车辆工程学院,北京100081

出　　处：《车辆与动力技术》2004年第4期52-56,共5页Vehicle & Power Technology

摘　　要：进行了单燃料天然气发动机电控系统开发研究.在经柴油机改进的天然气发动机上设计了高能点火系统、电控单元、传感器和执行器,加装三元催化转换器,实现闭环空燃比控制.电控单元采用MC68HC912系列单片机为核心,设计了开关型电子点火电路和峰值保持型电磁阀驱动电路,实现了点火和天然气的多点顺序喷射控制.通过电路的优化设计,提高电控单元的可靠性和抗干扰能力.台架试验证明了该电控系统的实用性.An electronic CNG engine control system was developed and its high-energy electric ignition, CNG supply system and electronic control unit were designed. The three-way catalytic converter was used to reduce the exhaust emission by the method of theoretical air-fuel ratio control. The MC68HC912 was chosen as the center for ECU and the electronic spark switch circuit, TBI injection valve driver were also designed for controlling ignition timing and multi-point sequential injection quantity of CNG. The ECU was designed especially for high reliability and anti-disturb ability. Engine bench tests showed that the e-lectronic Control system is practical.

关 键 词：电控单元 电控系统 三元催化转换器 天然气发动机 空燃比控制 电子点火 高能点火系统 多点顺序喷射 柴油机 单燃料 

分 类 号：TH772.1[机械工程—仪器科学与技术] U464[机械工程—精密仪器及机械]