Reducing Part Load Pumping Loss and Improving Thermal Efficiency through High Compression Ratio Over-Expanded Cycle

Yu, Wenbin; Du, Aimin

doi:10.4271/2013-01-1744

Cited by 32 publications

(16 citation statements)

References 21 publications

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“…Pumping mean effective pressure (PMEP) is a common parameter that characterizes the pumping loss in the engine's working cycle [17]. Figure 5 shows PMEP relative to intake advance angle under baseline EVC, and PMEP relative to exhaust retardation angle under the Miller cycle at different points of operation during the test.…”

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confidence: 99%

Study of the Miller Cycle on a Turbocharged DI Gasoline Engine Regarding Fuel Economy Improvement at Part Load

et al. 2020

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This contribution is focused on the fuel economy improvement of the Miller cycle under part-load characteristics on a supercharged DI (Direct Injection) gasoline engine. Firstly, based on the engine bench test, the effects with the Miller cycle application under 3000 rpm were studied. The results show that the Miller cycle has different extents of improvement on pumping loss, combustion and friction loss. For low, medium and high loads, the brake thermal efficiency of the baseline engine is increased by 2.8%, 2.5% and 2.6%, respectively. Besides, the baseline variable valve timing (VVT) is optimized by the test. Subsequently, the 1D CFD (Computational Fluid Dynamics) model of the Miller cycle engine after the test optimization at the working condition of 3000 rpm and BMEP (Brake Mean Effective Pressure) = 10 bar was established, and the influence of the combined change of intake and exhaust valve timing on Miller cycle was studied by simulation. The results show that as the effect of the Miller cycle deepens, the engine’s knocking tendency decreases, so the ignition timing can be further advanced, and the economy of the engine can be improved. Compared with the brake thermal efficiency of the baseline engine, the final result after simulation optimization is increased from 34.6% to 35.6%, which is an improvement of 2.9%.

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confidence: 99%

Study of the Miller Cycle on a Turbocharged DI Gasoline Engine Regarding Fuel Economy Improvement at Part Load

et al. 2020

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“…In the development of Mazda V6 Miller cycle engine equipped with a LIVC mechanism and a Lysholm supercharger, the ram-pulsation effects of the Miller cycle were well utilized to enhance the anti-knocking performance [19][20][21]. Wan et al [22] examined the effects of the Miller cycle on a high CR SI engine, and concluded that LIVC with a high valve lift should be implemented at high loads to reduce the effective CR and knock tendency while EIVC with a low valve lift should be adopted at low loads to improve the thermal efficiency. Gottschalk et al [23] investigated the effect of the Miller cycle with EIVC on knock control in a turbocharged, downsized DISI engine at the middle loads.…”

Section: Miller Cycle Enginementioning

confidence: 99%

A comparison between Miller and five-stroke cycles for enabling deeply downsized, highly boosted, spark-ignition engines with ultra expansion

Wang

Zheng

2016

Energy Conversion and Management

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“…본 연구에서는 국내 상용 하이브리드 차량의 엔진 제 원을 분석한 결과 (7) , LIVC(late intake valve closing)방식 (1,5,6) . 캠 프로파일 설계도면을 나타낸 것이다 (7) .…”

Section: 연구 목적 및 내용unclassified

A Study on Combustion Characteristics of Spark-Ignited Engine with Different Late Intake Valve Closing for Miller Cycle

Chung

Kang²,

Kim³

et al. 2015

Journal of ILASS-Korea

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In order to research engine characteristics of spark-ignited engine with intake valve closing timing change for Miller cycle, two cam for LIVC(Late Intake Valve Closing) were designed and fabricated an prototype valvetrain. And intake valve closing timing were adjusted to build low compressing and high expansion cycle for HEV. In experimental study, it were investigated with different engine speed, spark timing and air-fuel ratio to compare base cam and LIVC cam type. It was found that the volumetry efficiency and effective work of compression process were decreased in case of LIVC cam. When compared with the existing results, the maximum pressure in the cylinder was reduced about 12~13 bar and the volumetric efficiency was reduced about 16%.

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Reducing Part Load Pumping Loss and Improving Thermal Efficiency through High Compression Ratio Over-Expanded Cycle

Cited by 32 publications

References 21 publications

Study of the Miller Cycle on a Turbocharged DI Gasoline Engine Regarding Fuel Economy Improvement at Part Load

Study of the Miller Cycle on a Turbocharged DI Gasoline Engine Regarding Fuel Economy Improvement at Part Load

A comparison between Miller and five-stroke cycles for enabling deeply downsized, highly boosted, spark-ignition engines with ultra expansion

A Study on Combustion Characteristics of Spark-Ignited Engine with Different Late Intake Valve Closing for Miller Cycle

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