Topic
Spark-ignition engine
About: Spark-ignition engine is a research topic. Over the lifetime, 4352 publications have been published within this topic receiving 66550 citations.
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TL;DR: In this article, an experimental study was performed aiming at improving SI engine economic and emissions performance under a typical city driving condition of 1500 rpm and at the stoichiometric equivalence ratio with four intake manifold absolute pressures (MAP) of 39.3, 48.4, and 67.8 kPa and four hydrogen volumetric fractions of 1, 1.5, 2, and 3%.
Abstract: Concerning the low thermal efficiency and high emissions of spark ignition (SI) engines, an experimental study was performed aiming at improving SI engine economic and emissions performance under a typical city driving condition of 1500 rpm and at the stoichiometric equivalence ratio with four intake manifold absolute pressures (MAP) of 39.3, 48.1, 56.4, and 67.8 kPa and four hydrogen volumetric fractions of 1, 1.5, 2, and 3% on a modified 4-cylinder gasoline-fueled SI engine on which hydrogen can be injected into the intake ports sequentially via a self-developed electronic control unit (DECU) and mixed with gasoline online. The DECU can be used to adjust the injection timings and durations of hydrogen and gasoline to accomplish the specified volumetric fractions of hydrogen in air and the mixture equivalence ratios. The engine test results demonstrated that, compared with the original gasoline engine, the brake thermal efficiency and the cycle-by-cycle variation of the peak in-cylinder pressure were ave...
30 citations
TL;DR: In this paper, a coupling of pressure wave equation and KIVA-3V code with reduced chemical kinetic scheme has been conducted to systematically investigate pressure oscillation characteristic during knocking cycles based on a SI engine.
30 citations
03 Mar 2003
30 citations
TL;DR: In this article, an experimental study on the performance and exhaust emissions of a commercial hydrogen fueled spark ignition engine (HFSIE) was performed at partially and full wide open throttle (50% and 100% WOT) positions.
30 citations
01 Feb 1977
TL;DR: In this article, a five-cylinder variable displacement research engine has been designed, built, and tested for over one year, and its dynamics were thoroughly analyzed, and a fivecylinder configuration was selected to minimize vibration.
Abstract: A five-cylinder variable displacement research engine has been designed, built, and tested for over one year. Displacement is varied by changing the piston stroke using a four-bar linkage. By proper choice of the linkage dimensions, compression ratio can be held constant as the stroke changes, or it can be tailored to optimize economy and performance. Before the engine was built, its dynamics were thoroughly analyzed, and a five-cylinder configuration was selected to minimize vibration. Test data show that BSFC is, as expected, less dependent on load than in conventional engines, and averages less than 0.5 lb/bhp-hr over the load and speed range of ordinary automobile operation. Several methods for estimating urban fuel economy from dynamometer data predict a significant improvement compared with conventional engines. Emission controls have not yet been applied to this engine.
30 citations