车用天然气发动机起动过程的试验研究  

Experimental Study on Starting Process of Automotive Natural Gas Engine

作　　者：张红光[1] 郑轶[1] 刘凯[1] 王道静[1] 田小飞[1] 白明蕊[1] 韩雪娇[1] 

机构地区：[1]北京工业大学环境与能源工程学院,北京100124

出　　处：《内燃机工程》2010年第3期29-33,共5页Chinese Internal Combustion Engine Engineering

基　　金：北京市属市管高校人才强教计划资助项目(J4310790200801);北京市留学人员科技活动择优资助项目(38005051200701);北京市教委08年科研计划项目(JC005012200801);北京工业大学研究生科技基金资助项目(ykj-2007-1039);北京工业大学国家大学生创新性实验计划项目

摘　　要：采用自主研发的车用天然气发动机电控系统(ECU),针对经过改装后的JL465Q5发动机进行了起动试验研究。以AVR单片机为核心,ECU采用多片式结构,采用步进电机控制旁通空气阀开度,从而控制起动时的空气进气量,采用电控天然气喷射阀,控制起动时的天然气供给量;开发了试验监控系统,作为人机对话接口;开发了转速采集系统,可以准确实时地记录起动过程。试验结果表明:当起动转速较低时,应采用较浓的混合气;而且较高的冷却水温度有利于天然气发动机的冷起动过程;多次点火控制和提高点火能量有利于天然气发动机的顺利起动。An electronic control unit （ECU） developed for automotive natural gas engines was used in the modified model JL465Q5 gas engine to investigate its starting characteristics. The AVR single-chip processor was adopted as the core controller and the ECU was of multi-chip structure. The starting intake air flow was adjusted using an air bypass valve controlled by a step motor, and the natural gas delivery was con- trolled by the electronic gas injector. An experimental monitoring system was developed as the interface of man-machine interaction and a speed acquisition system was designed to record accurately the starting process in real time. The test results indicate that for the natural gas engine rich mixture is necessary for starting at low speed; higher coolant temperature is beneficial to engine cold starting; multi-strike ignition and high energy ignition are also contributive to engine starting successfully.

关 键 词：内燃机 天然气发动机 起动 步进电机 

分 类 号：TK464[动力工程及工程热物理—动力机械及工程]