Shizuo Sasaki

Effects of EGR on direct injection gasoline engine

Abstract A large amount of EGR was introduced into a direct injection gasoline engine. According to the increase of EGR rate, it was found that the combustion at the late period is hastened in spite of reduction of the initial burning rate. In consequence, both HC and NOx were reduced by EGR. This suggests that the effect on acceleration of the leaner mixtures flame propagation by hot EGR gas becomes varied under the condition of the stratified mixtures stabilized ignition.

A new combustion concept for clean diesel system with DPNR

This article presents a new combustion concept that enables effective after-treatment. A sufficient quantity of inert gas lowers the combustion temperature and therefore suppresses soot formation. Smokeless and yet stable rich combustion can be achieved in the advanced injection timing and high EGR rate region. In the European transient test mode, this combustion concept enables a diesel engine to maintain a high catalyst bed temperature with a minor fuel penalty and to drastically reduce NOx and PM emissions.

Smokeless rich combustion technique to purify diesel engine exhaust emissions

A new combustion technique that would utilize an aftertreatment system in diesel engines is proposed.