DESIGN AND DEVELOPMENT OF NATURAL GAS INJECTION SYSTEM IN IC ENGINE - A DETAILED REVIEW

As we are facing the lack of conventional fuels we have to use alternatives. Compressed Natural Gas (CNG) is regarded as one of the most promising alternative fuels, and may be the cleanest fuel for the spark ignited (SI) engine. Its high octane number permits a high compression ratio, thereby leading to higher thermal efficiency, and lower emissions could be released by using CNG. Today, we are using CNG kit for SI engine contains various types of injection systems with ECU (Electronic control unit). Among them direct injection system is latest fuel injection technique used in IC engine. In the SI engine, direct injection (DI) technology significantly increases the engine volumetric efficiency and decreases the need of throttle valve for control purposes. During low load and speed conditions, DI allows engine operation under ultra-lean conditions by realizing the stratified charge. This enables the use of extremely lean air–fuel mixtures, thereby reducing fuel consumption. In this work, the attempt will made to replace this ECU with mechanical devices thereby developing and designing a new direct injection system. After implementing the system with SI engine rate of fuel consumption, performance and emissions will be measured.