TY - JOUR AU - Hamada, Khalaf Ibrahim AU - Rahim, M. F. AU - Rahman, M. M. AU - Bakar, R. A. PY - 2022/12/28 Y2 - 2024/03/28 TI - Throttling Effect on the Performance and Emissions of a Multi-Cylinder Gasoline Fuelled Spark Ignition Engine JF - International Journal of Automotive and Mechanical Engineering JA - Int. J. Automot. Mech. Eng. VL - 19 IS - 4 SE - Articles DO - 10.15282/ijame.19.4.2022.05.0779 UR - https://journal.ump.edu.my/ijame/article/view/5457 SP - 10084-10093 AB - <p>The throttle mechanism, a regulatory technique of engine output, is accompanied by a loss of some energy. The effect of intake air throttling on the performance and emissions of a multi-cylinder spark ignition gasoline engine was experimentally investigated. The engine was coupled to a hydraulic dynamometer equipped with a customized cooling system for both the engine and dynamometer. Experimental tests were performed for various engine speeds and air-fuel ratios at the WOT and POT conditions with optimized ignition timing. The acquired results recorded that a better engine operation could be achieved with WOT in terms of <em>bmep</em>, <em>bsfc</em>, <em>η<sub>b</sub></em>, CO, CO<sub>2</sub> and UHC compared to POT. At the same time, the worst trend at WOT was noticed for the NO<sub>x</sub> concentration due to the higher conversion efficiency of fuel combustion. In terms of engine speed for both WOT and POT conditions, operating at 3000 rpm represents the minima of <em>ϕ</em>, <em>bsfc</em>, CO and UHC; and the maxima of <em>η<sub>b</sub></em>, CO<sub>2</sub> and NO<sub>x</sub> with some fluctuation on both sides of this point. Maximum recorded values of <em>η<sub>b</sub></em> were about 30.55% and 28. 55%, while the minimum values of <em>bsfc </em>were about 274 and 293 g/kW.h for the WOT and POT conditions, respectively. The maximum <em>bmep</em> was obtained at 2500 rpm at WOT and POT conditions with values of about 940 kPa and 904 kPa, respectively. Maximum recorded values of NO<sub>x</sub> were about 1525 and 977 ppm for the WOT and POT conditions, respectively.</p> ER -