Under this background , we successfully developed an engine fuelled with coal - bed gas and ignited by spark plug . the measurements for the prototype engine were thoroughly made , including the cylinder pressure , the rate of heat release , combustion duration , ignition delays , spark ignition angle , and the fluctuation of the cylinder maximum pressure 在此背景下，本文对经由s195柴油机改装得到的燃用变组分煤层气发动机进行了全面的测试和分析，包括缸内示功图、燃烧放热率、主燃期、点火提前角、火焰发展期以及最大压力循环波动等。
Firstly , based on the analysis of the principle of the capacitor discharge ignition system in the gasline engine and the characteristics of ignition parameters in the gasline engine , the author proposes the methods of ignition parameters measurement , including the speed of the gasline engine , ignition advance angle , ignition voltage , ignition current and igniton energy 首先，在认真分析汽油机电容放电点火系统的工作原理及其点火参数的特性的基础上，提出了汽油机转速、点火提前角、点火电压、点火电流和点火能量的测量方法。
A new method is put forward on thermodynamics combustion model to make imitating research on egr - a software is made to calculate the amount of no from the gasoline by connecting with the practical condition in our country , starting with thermodynamics and experiment at the same time make a system research to influence by the exhaust gas returning system on the gasoline , such as exhaust gas , fuel economy , and power , finally a new thought is afforded for optimizing all the egr parameter in chapter 6 第五章采用上述诊断和预测模型对bj492q发动机进行了模拟计算和实验研究，并探讨了点火提前角、残余废气系数、燃空比、压缩比和火花塞位置对发动机性能的影响。第六章提出了基于热力学燃烧模型对egr进行数值模拟的方法，系统地研究了车用汽油机加装egr系统后对排放、油耗、功率的影响，并结合排放标准。提出了egr参数的全局优化的新思路。
The lpg - fueled engine is modified and optimized using electronic controlled fuel injection technology ; the comparison of engine performance with direct injection , intake liquid injection and gas injection has been done . the air fuel ratio , ignition timing and injection timing of the engine has been optimized and calibrated 本文利用电控喷射技术对lpg发动机进行改造和优化，对比研究缸内直接喷射、进气道液态喷射和气态喷射的发动机性能，并对空燃比、点火提前角和喷射时刻等控制参数进行优化和标定。
The system obviously features measuring ignition advance angles and engine working process at same time . while the effect of ignition advance angles on working process could not be reflected directly for lots of types of motor - engine ever before . this paper reports the implementation of software and hardware of the system 本系统最大的特色在于将摩托车发动机点火提前角的测量与发动机工作过程的测量统一起来，而此前，对于相当多的机型，根本无法直接反映点火提前角对发动机工作过程的影响。
