摘要
根据稀燃增压点燃电控调压式CNG发动机的特点,设计了起动及怠速控制策略,对目标怠速、节气门开度、废气旁通阀开度、燃气供给压差、点火提前角、点火能量、空燃比等参数进行控制。在6缸直列单一CNG发动机上进行了起动及怠速调速试验。试验结果表明:通过优化起动燃气供给量、初始节气门开度、起动点火提前角等参数,可以实现CNG发动机快速、可靠起动;通过标定怠速节气门调速和点火提前角调速控制参数,实现了怠速工况稳定运行。
Start and idle control strategy of lean-burn turbocharged spark-ignition EPR(Electronic Pressure Regulator)-based CNG engine are developed according to the operating characteristic of engine. The main control parameters include that desired idle speed, throttle position, wastegate valve position, EPR delta-pressure, spark advance, spark energy and air-fuel ratio. The tests of start and idle were made on a four stroke inline engine fueled with CNG. The results indicate that the CNG engine can start fast and reliably by optimizing the control parameters including start EPR delta-pressure, initial throttle position and start spark advance, etc. Through calibrating idle governor parameters, the stability of idling operation of CNG engine can be improved.
出处
《车用发动机》
北大核心
2009年第6期51-54,58,共5页
Vehicle Engine
基金
国家"八六三"计划"大型公交车用CNG发动机产品开发"项目(2006AA11A1A9)