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Exhaust Gas Recirculation, Late Intake Valve Closure and High Compression Ratio for Fuel Economy Improvement in a MPI Gasoline Engine
Technical Paper
2014-01-1197
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The effects of exhaust gas recirculation (EGR), late intake valve closure (LIVC) and high compression ratio (HCR) on the performance of a 1.6L multi-point injection (MPI) gasoline engine at 2000rpmwere investigated in this paper. Compared to the baseline engine, The improvement of fuel consumption is about 1.4%∼4.5% by using EGR only because of a reduction of pumping loss(PMEP). Nevertheless deterioration of combustion is introduced at the same time for high specific heat of EGR. The maximum EGR rate introduced in this system is limited by cyclic variations of indicate mean effective pressure (COVIMEP) at low load and fresh charge to achieve enough output power at high load. After combined LIVC and HCR, the improvement of fuel consumption is about 3.5%∼9.6% compared with the baseline engine at the same operation conditions because of significant PMEP reduction, increasing of effective compression ratio (ECR). LIVC&HCR&EGR can improve BSFC further, however, for getting stable combustion process and sufficient power, the combined technology is mainly suitable for medium load.
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Authors
- Yunlong Li - State Key Laboratory of Engines, TJU
- Yiqiang Pei - State Key Laboratory of Engines, TJU
- Jing Qin - Internal Combustion Engine Res. Ins. TJU
- Shaozhe Zhang - State Key Laboratory of Engines, TJU
- Yu Shang - Changan Automotive Engineering Res. Ins
- Le Yang - Changan Automotive Engineering Res. Ins
- Xuesong Wu - Changan Automotive Engineering Res. Ins
Topic
Citation
Li, Y., Pei, Y., Qin, J., Zhang, S. et al., "Exhaust Gas Recirculation, Late Intake Valve Closure and High Compression Ratio for Fuel Economy Improvement in a MPI Gasoline Engine," SAE Technical Paper 2014-01-1197, 2014, https://doi.org/10.4271/2014-01-1197.Also In
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