摘要：AbstractIn this research, a second order sliding mode (SOSM) strategy to control the Atkinson cycle engine breathing subsystem with an alternative late intake valve closing (LIVC) scheme is presented. The control framework based on extended mean value engine model (EMVEM) of the Atkinson cycle engine in view of fuel economy is evaluated for the standard Federal Urban Driving Schedule (FUDS) and US06 driving cycles. In this context, the authors have already proposed a control-oriented EMVEM model of the Atkinson cycle engine with variable intake valve actuation, well suited for SOSM design. To demonstrate the benefits of the VCR Atkinson cycle engine over conventional Otto cycle engine, in the presence of auxiliary loads and uncertain road loads, its EMVEM model is simulated by using a precisely tuned super-twisting controller having similar specifications as that of the conventional gasoline engine. The resulting approach confirms the significant decline in engine part load losses and improvement in the thermal efficiency and, accordingly, exhibits considerable enhancement in the fuel economy of the VCR Atkinson cycle engine over Otto cycle engine during the wide operating range.
关键词：KeywordsSliding mode (SM) controlAtkinson cycle enginefuel economymean value engine modelvariable valve timing (VVT)variable compression ratio (VCR)
