Abstract
As a result of the theoretical research, calculations of the theoretical indicated specific fuel consumption for different methods of conversion of diesel engines to gas were carried out. The traditional method of derating in the conversion of diesel engines to gas by installing additional gaskets between the cylinder head and block was considered and the method of derating due to late intake valve closing was proposed.As a result of in vitro experimental research with different methods of conversion of the Opel X17DTL diesel engine, it was found that using the traditional method of engine derating by installing additional gaskets between the cylinder head and block, the indicated specific consumption increased, on average, by 8–9 %. But with a decrease in the compression ratio of the engine by the proposed method due to late intake valve closing, the experimental value of the indicated specific consumption not only did not increase, but decreased, on average, by 7–8 %. The reduction of the compression ratio of the engine due to late intake valve closing by the proposed method was carried out by changing the shape of the camshaft cams. To this end, the cams of the intake valves were fused and then ground to the desired profile, with which late intake valve closing occurred within the predetermined limits.The results obtained allow optimizing the processes of conversion of diesel engines to gas and reducing the fuel consumption of converted engines, on average, by 15–17 % compared to gas engines converted in a traditional way.
Highlights
With current production volumes and proved reserves, oil will be enough for mankind for about fifty years
It is indisputable that cars with engines that operate on gas and other alternative fuels have worse fuel consumption compared to similar diesel engines [2]
Discussion of the results of the research of the indicated specific fuel consumption of diesel engines converted to gas fuel
Summary
With current production volumes and proved reserves, oil will be enough for mankind for about fifty years. Easier ways to reduce the compression ratio of the diesel engine in conditions of service stations or autoenterprises are [3]: – increase in the combustion volume in the head or pistons by milling; – increase in the thickness or number of gaskets between the engine block and the head. Reduction in the indicated efficiency, especially at low loads, causes an increase in throttling losses This leads to a deterioration of the gas fuel economy, on average, by 10–25 % compared to the base diesel engine. A more up-todate method of reducing the compression ratio of the base diesel engine due to later intake valve closing is proposed This allows achieving a reduction in the effective compression ratio, making it considerably smaller than geometric. This allows minimizing the problem of detonation combustion of the gas-air mixture and at the same time increasing the indicated engine efficiency and reducing fuel consumption
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