中文摘要：

针对主要应用于农用机械的非电控单缸柴油机,在不改动原有机械部分,仅增加CNG电控供气系统基础上对发动机进行了改装。对单缸柴油机瞬时转速进行理论分析及实验测量后,总结单缸机瞬时转速波动的规律,提出一种基于瞬时转速的判缸策略。设计CNG-柴油双燃料单缸机试验方案,在微控制器上实现该判缸策略及喷气驱动后进行发动机台架试验。试验结果表明：在稳定及变工况下,基于该策略的判缸准确;该套试验方案能够稳定控制发动机运行。

英文摘要：

Aiming at the non-electronically controlled single-cylinder diesel mainly applied for agricultural machinery,the electronically controlled CNG gas supply system was only increased to modify the engine but maintaining the original mechanical part.Theoretical analysis and experimental measurement of instantaneous speed for single-cylinder diesel were conducted.The law of single-cylinder instantaneous speed variation was summarized,and based on the law a position determination strategy was proposed.An experimental scheme for CNG-diesel dual-fuel single-cylinder diesel was designed.After implemented the strategy and CNG injection driver on microcontroller,bench tests were carried out.The results showed that position determination based on this strategy achieved good accuracy and the engine ran stably,both under stable and variable engine conditions.