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Advanced Emission Control Technology by utilizing Freedom of Mixing on GDI Engine
Technical Paper
2000-05-0139
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English
Abstract
A two-stage combustion is one of the GDI™ technologies for a quick catalyst warm-up on cold-start. However, when the combustion is continued for a long time, increase of the fuel consumption is a considerable problem. To solve the problem, two emission control technologies are newly proposed. The combustion has a potential to maintain thermal reaction at out of a cylinder. However, the burning gas has hardly an opportunity to meet with the unburned gas. A reactive exhaust manifold promotes mixing and reaction of these gases. The fuel economy is improved because the manifold strengthens the catalyst warm-up and reduces HC emissions. A stratified slight-lean combustion, which is locally prepared rich mixture in cylinder, supplies simultaneously substantial CO and surplus O2 to a catalyst and induces catalyst reaction. CO oxidation warms up the catalyst and promotes HC oxidation. The fuel consumption is greatly less than the two-stage combustion. Consequently, when warm-up time of the two-stage combustion is shortened by introduction of the stratified slight-lean combustion, the fuel economy is improved while maintaining low emission level. To avoid soot generation and fouling of a spark plug, fuel vaporization and diffusion are facilitated by adjustment of an interval between a fuel injection and a spark ignition. These are realized by excellent robustness based on wide spacing concept.
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Authors
- Shigeo Yamamoto - Power Train Research Department, Car Research & Development Center Mitsubishi Motors Corporation 1, Nakashinkiri, Hashime, Okazaki, 444-8501 Japan
- Dai Tanaka - Power Train Research Department, Car Research & Development Center Mitsubishi Motors Corporation 1, Nakashinkiri, Hashime, Okazaki, 444-8501 Japan
- Jun Takemura - Power Train Research Department, Car Research & Development Center Mitsubishi Motors Corporation 1, Nakashinkiri, Hashime, Okazaki, 444-8501 Japan
- Ando Hiromitsu - Power Train Research Department, Car Research & Development Center Mitsubishi Motors Corporation 1, Nakashinkiri, Hashime, Okazaki, 444-8501 Japan
Topic
Citation
Yamamoto, S., Tanaka, D., Takemura, J., and Hiromitsu, A., "Advanced Emission Control Technology by utilizing Freedom of Mixing on GDI Engine," SAE Technical Paper 2000-05-0139, 2000.Also In
References
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