نوع مقاله : مقاله پژوهشی
موضوعات
عنوان مقاله English
نویسندگان English
This study investigates the performance of a spark-ignition engine with an increased effective compression ratio achieved through Atkinson-cycle operation via intake cam profile design. A conventional four-stroke turbocharged spark-ignition engine with a geometric compression ratio of 9.2 and a maximum power output of 112 kW was selected as the baseline engine. A validated one-dimensional engine simulation model was developed, incorporating in-cylinder pressure calibration using a turbulent combustion model for spark-ignition engines. Based on this model, Atkinson-cycle operation was implemented through intake camshaft optimization. Engine performance was evaluated over a wide range of speeds and loads, with particular emphasis on brake-specific fuel consumption (BSFC), torque, and overall fuel economy. Comparative analyses were conducted between the baseline engine and the optimized Atkinson-cycle configuration. The results indicate that intake valve timing optimization enables a reduction in average fuel consumption of approximately 2–3%, with an overall fuel consumption improvement of 2.5%. These findings demonstrate that Atkinson-cycle implementation through valve timing modification can effectively enhance fuel economy under the investigated operating conditions.
کلیدواژهها English
