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Analysis of CO Emission Sources in Diesel Combustion (Third Report)~CO Reduction Techniques and its Validation
Published May 23, 2012 by Society of Automotive Engineers of Japan in Japan
CO emission sources from diesel combustion with multiple fuel injections were analyzed by using in-cylinder CO-LIF imaging and numerical simulation. The major source of CO emission under low-load conditions is the over-diffusion of pilot sprays, and that under high-load condition is the shortage of oxygen in the rich regions at the frame front. As an example of CO reduction techniques, a new piston-cavity with a stepped lip which reduces the squish flow velocity was introduced. Its effects on CO emission were validated by exhaust emission tests and simulations.
- Takayuki Fuyuto - Toyota Central R&D Labs.
- Reiko Ueda - Toyota Central R&D Labs.
- Yoshiaki Hattori - Toyota Central R&D Labs.
- Jun'ichi Mizuta - Toyota Central R&D Labs.
- Kazuhiro Akihama - Toyota Central R&D Labs.
- Hisaki Ito - Toyota Motor
- Akio Kawaguchi - Toyota Motor
- Hideki Aoki - Toyota Industries Corp.
- Tsutomu Umehara - Toyota Industries Corp.