Browse Publications Technical Papers 2013-01-2636
2013-10-14

Effect of Injection Timing Retard on ISI Strategy in Lean-burning LPG Direct Injection Engines 2013-01-2636

Because of the concerns regarding global warming caused by greenhouse gases and the high cost of fossil fuels, research on improving the fuel economy and emissions in internal combustion engines has become important. Specifically for spark ignition engines, lean-burning direct injection is the most promising technology because the fuel economy and emissions can be improved using a stable combustion of a stratified mixture. This study aimed to develop a spray-guided, lean-burning liquefied petroleum gas (LPG) direct injection engine through optimizing the combustion parameter controls. In previous research, the brake thermal efficiency in an LPG direct injection engine was significantly increased and stable combustion was secured with an interinjection spark ignition (ISI) strategy under low-load operating conditions.
However, the simple application of an ISI strategy does not improve the combustion stability under relatively high-load operating conditions, and consequently, the extent of specific fuel consumption reduction is small. In the present study, the effect of injection timing on the combustion stability was assessed and the fuel economy and emission characteristics were compared. Retarding the 2nd injection timing of the ISI strategy effectively improved combustion stability, but it did not reduce the fuel consumption.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 43% off list price.
Login to see discount.
Special Offer: With TechSelect, you decide what SAE Technical Papers you need, when you need them, and how much you want to pay.
X