Study On The Emission Performance Of Dual Fuel Engine With Electronically-controlled Sequential LPG Injection

As an alternative fuel for internal combustion engine, LPG (Liquefied Petroleum Gas) has excellent application prospect in solving the problem of energy shortage and serious environment pollution. LPG-diesel fuel dual fuel engine has been receiving more and more attention for its advantages such as good performance, convenient refitting and flexible use.But not every dual fuel engine can achieve outstanding comprehensive results. Generally, there are many problems such as misfire, backfire, knocking and sharply increased emissions of HC and CO, which cucumber its application. A LPG fuel supply system and an electronic control system were provided by this paper to fulfill the function of dual fuel on the diesel engine tested. Therefore, compared with each solution, electronically-controlled sequential LPG injection was preferred by this paper. The timing-and-quantitation precision injection of LPG was realized with high-speed LPG solenoid valve and a set of electronic control system, which was designed by the author and can flexibly control the gas supply system of LPG. Based on the analysis of experimental data got by comparing the performances before and after the application of the set of equipment on LR6105Q12 diesel engine, the effects of load, speed and replace ratio, etc on the emissions of smoke, HC and CO of dual fuel engine were expounded. Through optimization, the smoke emission was utmostly reduced and the emissions of HC and CO were within the government restriction. So it was proved that the engineering application value of the refitted engine wasimproved by this refitting method.Gas supply system and adjustment principle of replace ratio were introduced indetail and the experimental data was analyzed. The qualification of liquid injection and its merits were also explained in this paper.