Reduction of Exhaust Emissions and Fuel Consumption by Premixed Type Diesel Combustion (First Report)

–A Combustion Concept Controlled by Intake Gas Temperature and Fuel Injection Timing (ITIC-PCI) and Its Fundamental Investigation–

Abstract

A premixed type diesel combustion was developed, which achieves significant low emissions and low fuel consumptions. Its features examined by CFD withφ–T analysis and engine experiment are as follows: On φ–T map, combustion gas should use low temperature side (T<2000K) from the NOx formation area. Although the gas may slightly enter the soot formation area, it should frequently reach the ideal area (1500K<T<2000K,φ<1) where the oxidation of soot and CO•HC can be expected at the combustion latter term. The gas behavior can be realized by the extremely cooled intake gas and the reduced intake oxygen density.