Efficiency enhancement of spark-ignition engines using a Continuous Variable Valve Timing system for load control

• Published in: Energy (Oxford) Vol. 161; pp. 649 - 662
• Main Authors: Osorio, Julian D., Rivera-Alvarez, Alejandro
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 15.10.2018; Elsevier BV
• Subjects: Air intakes; Combustion temperature; Compression; Continuity (mathematics); Continuous Variable Valve Timing Engine (CVVT Engine); Control systems; Dilution; Economic analysis; Efficiency enhancement; Energy efficiency; Engines; Fuel consumption; Fuel economy; Irreversible engine operation; Mathematical models; Otto cycle; Power consumption; Power efficiency; Spark ignition; Throttled Engine; Throttles; Valves; Throttled Engine; Fuel economy; Efficiency enhancement; Irreversible engine operation; Continuous Variable Valve Timing Engine (CVVT Engine)
• ISSN: 0360-5442; 1873-6785
• DOI: 10.1016/j.energy.2018.07.009

In this work, a Continuous Variable Valve Timing (CVVT) system for load control in spark-ignition engines is proposed, analyzed, and compared with a conventional Throttle-controlled Engine. An analytical model for ideal processes is initially developed to study the performance of both cycles during part-load operation. Then, irreversibilites comprising charging dilution effects and heat losses during compression and expansion strokes are considered to approach a more realistic engine operation. At full-load, both cycles reach a maximum efficiency corresponding to that of an Otto cycle. However, a reduction in the efficiency occurs at part-load operation, with the CVVT Engine having a higher efficiency with respect to the Throttled Engine due to its unthrottled load control mechanism, which avoids power consumption caused by friction during air intake. It is found that charge dilution exerts a strong impact in the net power output and efficiency of both cycles. Additional reductions in power output and efficiency are caused by heat losses. At part-load operation, lower temperatures and pressures are reached in the CVVT Engine, which imply lower mechanical stresses that favor engine lifetime. It also represents a potential for additional efficiency enhancement via increasing combustion temperature. Finally, a fuel economy estimation analysis is carried out to provide quantitative assessment about the economic advantage of the proposed CVVT Engine. From this analysis, a fuel economy increment of up to 4.1% is obtained for a CVVT Engine with respect to a Throttled Engine at a 20%–30% load, which is typical of a real vehicle engine operation. •A proposed CVVT Engine cycle is studied and compared with a Throttled Engine cycle.•Ideal cycle operation as well as charge dilution and heat losses are considered.•The CVVT Engine presents higher efficiency than the Throttled Engine at part-load.•Charge dilution and heat losses strongly impact the net power output and efficiency.•Fuel economy increases in a CVVT Engine with respect to a Throttled Engine.