The Electronically Controlled Lpg Injection Engine Several Times To The Ignition System

Recently, liquefied petroleum gas (LPG) has been applied widely as engine's alternative fuel. But compared with gasoline, it has higher ignition temperature and lower flame spreading velocity. Normal gasoline engine's ignition system could not meet LPG engine's ignition demand. So, this paper exploited a multiple times ignition system based on PC controlled LPG injection. Through experiment, we found this system can reliably realize the optimization of ignition timing and multiple times ignition. It also has obvious effects on the improvement of LPG engine's performance and emission.First, this paper studied the overall scheme of electronically controlled LPG injection engine's multiple times ignition system. According to this scheme, the open-loop control strategy was chosen. Then, the hardware and software of this system were designed. The whole system's central control unit is PC.Secondly, this paper analyzed the formats of ignition system driving circuitry, ensured the design thought of capacitance discharged driving circuitry. After times grope and experimentation, the design of ignition driving circuitry was accomplished.At last, the author did an experiment on 170F engine with the exploited system. The result indicated: This ignition system can reliably realize the optimization of ignition timing and the adjustment of multiple times ignition. It has a good effect on the improvement of engine's emission and performance.