[01] Abhay Tiwari, Mechanical Engineering Department, Chandigarh Group of Colleges Technical Campus, Mohali, India.

Over the past many years, large numbers of car buyers have been opting for a petrol car with a compressed natural gas (CNG) kit fitted by the company. The most important thing is that the petrol engines cause global warming by having a large amount of toxic gases exhausted by the petrol cars. However, by the introduction of catalytic converters (a catalytic converter is a vehicle emissions control device that converts toxic pollutants in exhaust gas to less toxic pollutants by catalysing a redox reaction) we have been able to reduce the toxic emissions. Use of Catalytic converters in internal combustion engines fuelled by either petrol or diesel, which reduces pollutants such as CO to a much less harmful gas, such as CO₂. Because of this, a catalyst car also consumes slightly more fuel, thus reducing its performance. However, by having these improvements, petrol engine cars with catalysts still exhaust more CO and HC than cars with diesel engine, and by using a CNG kit there is are other problem such as starting problems and jerks. Therefore, CNG kit is not as useful as it is expected to be. An alternative to this is a diesel engine (dual fuel engine). However, a question arises that, Why Should one Choose a Diesel Powered dual fuel Engine over other. So the answer is Diesel fuel contains more energy per litre than petrol. Thus, making more efficient than petrol engine car. Diesel fuel contains no emissions of the regulated pollutants like (carbon monoxide, hydrocarbons and nitrogen oxides) which are quite less than those from petrol cars without a catalyst. Therefore, diesel engines are attracting greater attention due to higher efficiency and cost effectiveness. Now, the main objective of this paper is to convert a diesel engine into duel fuel engine with compressed natural gas, which will overcome the problem of cost and global warming. This paper presents a dual fuel system for diesel-natural gas operation for a diesel engine, and analysis of the operating characteristics of the engine.

CNG-compressed Natural Gas, CO-carbon Oxide, HC-hydro Carbon, NO-nitrogen Oxide, DNG-diesel Natural Gas Engine

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