Abstract: In the future, automotive engine should satisfy the more stringent CO₂emission regulation without trading off the higher thermal and combustion efficiencies. Natural gas is one of the most promising alternative fuels for automotive engine, because it can reduce exhaust gas emissions than gasoline, diesel and LPG fuel, and can be used in conventional engines with a little modification. But, the performance of natural gas engine is fewer than gasoline, diesel and LPG fuel engine. Therefore, natural gas engine is requires a different methods for the improvement of engine characteristics such as engine power, fuel economy, brake thermal efficiency and exhaust gas emissions. Low compression, high expansion ratio could be one of the solutions in this context, which can be realized in automotive engines by making the expansion period longer than compression period. The objective of this study is to examine the effect of low compression, high expansion ratio on engine characteristics such as engine power, fuel economy, brake thermal efficiency. To realize low compression, high expansion ratio in engines, intake valve timing was varied by applying several cam-shafts with different cam profiles. Also a supercharger was adopted to increase the power. These experiment results may be utilized to develop natural gas engine of high efficiency and low emissions for automotive.
Publication Year: 2005
Publication Date: 2005-05-01
Language: en
Type: article
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