CNG as an Alternative Fuel in I.C. Engines: A Review

Use of diesel, petrol in automobile sector leads to increase in air pollution, which is now becoming a serious urban as well as global problem in world. The environmental hazards are increasing with the increasing population and demands of vehicles. This has resulted in an increased interest in using CNG as a fuel for SI engine in urban as well as sub urban regions. CNG is used in traditional gasoline/internal combustion engine automobiles that have been modified or in vehicles which were manufactured for CNG use, either alone or with a segregated gasoline system to extend range (dual fuel) or in conjunction with another fuel such as diesel (bi-fuel). Natural gas vehicles are increasingly used in India. Fast depletion of fossil fuels is urgently demanding a carry out work for research to find out the viable alternative fuels for conforming sustainable energy demand to minimum environmental impact. In the future, our energy systems will need to minimize pollution under sustainable limits, efficient and cost effective operations, convenient and safe working. In this study, a comprehensive review of various operating parameters and concerns have been prepared for better information of operating conditions (spark and compression ignited engines) and constrains for a natural gas fueled internal combustion engine.