电喷LPG发动机快速燃烧过程的应用研究

介绍了应用于高速单燃料LPG电喷发动机的高能双火花塞快速燃烧系统的组成及其在发动机稳态运行工况的稀燃研究。开发了发动机多通道瞬态燃烧分析系统用于LPG快速燃烧过程的研究，快速燃烧系统的同步、异步点火通过ECU及其控制策略的控制实现。试验结果表明：LPG混合气的火焰传播速度得到提高，LPG的燃烧稀限由过量空气系数1．25—1．4拓展为1．4—1．5；结合燃烧室和火花塞位置的优化，火焰传播距离被缩短以实现LPG稀混合气的快速燃烧。

An Investigation on Rapid Burning of Electronically Controlled Spark Ignition LPG Engine

An electronically controlled rapid burning system with high-energy, dual-spark plug ignition in a high-speed LPG engine was introduced and lean mixture combustion under steady engine operation was investigated. Meanwhile, a multi-channel transient SI engine combustion analyzer was developed. Synchronized and asynchronous ignition timing are realized by ECU and engine operation control strategy. Experimental results show that flame propagation of LPG mixture can be improved by enhanced ignition energy and dual-spark plug ignition mode. The excess air ratio was extended from range of 1.25 - 1.4 to range of 1.4 - 1.5. Cooperating with combustion chamber and spark location optimization, the flame propagation distance is shortened to realize fast burning.