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LPG Direct Injection Seminar Report

This topic deals with a novel idea of a Direct-Injection system incorporated into 2-stroke engine. Throughout South-Asia there are 25 million 2 wheelers running on 2-stroke engines and its mainly owned by daily laborers as there means of transport. This DI system also tries to increase the fuel efficiency by reducing spillage of fuel and also by reducing the fresh charge loss. LPG is the fuel which is being used here as it has its own inherent advantages over liquid gasoline. Injector is kept at transfer port so as to reduce stress upon Injector and to have flexible Injection timing. Even though this system works well with existing ignition system of the 2-wheeler it is being recommended to go for a fast-response inductive ignition system. CFD Simulations of various injector positions and its after-effects are thoroughly analyzed and various graphs are plotted to find the best injector position. Emission of different gases are studied and compared with an existing engine.

Two-stroke vehicles are commonly used in small transportation units in South Asia. The pollution created by these two stroke vehicle is significant. Two-stroke powered two wheelers are predominantly used by people not above middle class as cargo goods transports and personal transportation for their day-to-day needs. Increasing petrol prices are pushing users to switch to cheaper fuels and more efficient engines. Direct injection (DI) of fuel into the two-stroke engine combustion chamber is a possible solution to improve the efficiency and emissions of the engines. There are over twenty five million two-stroke two- and three wheelers in South Asia. These vehicles emit substantial quantities of hydrocarbons (HCs), carbon monoxide (CO) and particulate matter (PM) which have significant adverse health effects and deteriorate environmental quality. This is especially obvious in densely populated cities of South Asia that rely on motorcycles as an essential transportation mode. Recently, two stroke vehicles have become less popular compared to four stroke vehicles, but there are still large numbers of two stroke powered vehicles running in South Asia. Most of the two- stroke vehicle owners are in the low to middle class in South Asia. Buying a new vehicle represents a significant financial burden for them.
Use of a two-stroke DI system using Liquid Petroleum Gas (LPG) which is less expensive in many markets than gasoline to convert the carbureted two-stroke engine to direct injection could be a win-win solution where the conversion will improve fuel saving and reduce emissions at lower cost than the purchase of a new vehicle.

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