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Mode Switch of SI-HCCI Combustion on a GDI Engine
Technical Paper
2007-01-0195
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Multi-mode combustion is an ideal combustion strategy to utilize HCCI for internal combustion engines. It combines HCCI combustion mode for low-middle load and traditional SI mode for high load and high speed. By changing the cam profiles from normal overlap for SI mode to the negative valve overlap (NVO) for HCCI mode, as well as the adjustment of direct injection strategy, the combustion mode transition between SI and HCCI was realized in one engine cycle. By two-step cam switch, the throttle action is separated from the cam action, which ensures the stabilization of mode transition. For validating the feasibility of the stepped switch, the influence of throttle position on HCCI combustion was carefully studied. Based on the research, the combustion mode switch was realized in one engine cycle; the whole switch process including throttle action was realized in 10 cycles. The entire process was smooth, rapid and reliable without any abnormal combustion such as knocking and misfiring.
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Authors
- Guohong Tian - State Key Laboratory of Automotive Safety and Energy, Tsinghua University
- Zhi Wang - State Key Laboratory of Automotive Safety and Energy, Tsinghua University
- Qiangqing Ge - State Key Laboratory of Automotive Safety and Energy, Tsinghua University
- Jianxin Wang - State Key Laboratory of Automotive Safety and Energy, Tsinghua University
- Shijin Shuai - State Key Laboratory of Automotive Safety and Energy, Tsinghua University
Citation
Tian, G., Wang, Z., Ge, Q., Wang, J. et al., "Mode Switch of SI-HCCI Combustion on a GDI Engine," SAE Technical Paper 2007-01-0195, 2007, https://doi.org/10.4271/2007-01-0195.Also In
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