Katsuhiko Yokota

Relationship between NOx and SM emissions from DI diesel engine with EGR

An experimental study was conducted aimed at understanding the effect of EGR on engine performance and emission under a wide range of engine speed and load. The NOx reduction rate with EGR can be correlated well with O2 concentration in inlet gas over a wide range of injection pressure and timing. However, if the EGR temperature changed, the NOx reduction rate would have different behavior with O2 concentration. Also, smoke emission degeneration with EGR can be correlated with the global A/F ratios. Finally, combustion visualization was used to explain the mechanism of EGR.

A New Look at the Utilization of Alternate Fuels for Diesel Engines - IDIS

A new and unique dual-fuel injection system has been developed for high speed automotive diesel engines. This system has two features. One is that alternate fuels such as methanol, ethanol and biomass, are directly inducted into the fuel injection pipe through a one-way check valve under pressure, and blended fuels are simultaneously injected into the combustion chamber. The other is that various kinds of fuel can be easily adapted to this system not dependent upon the fuel properties such as viscosity. Using a single cylinder direct injection diesel engine and ethanol as an alternate fuel, injection characteristics and exhaust gas emissions were investigated.

Light-Weight, Quiet Automotive D.I. Diesel Engine Oriented Design Method

Methode de conception de moteurs diesel a injection directe legers et silencieux pour automobiles