Development of Combustion System for New 2.0-Liter Inline 4-Cylinder Turbocharged Direct-Injection Gasoline Engine

Abstract

D-4S that combines direct and port fuel injection was made it adapted to turbocharged engine. Combustion speed was raised to correspond to high “Pme” of turbocharged engine by high tumble ratio. Simultaneously, piston which specialized in catalyst heating was improved to raise turbulence intensity and direct injection spray pattern was optimized. In addition, multiple direct injection strategy enabled optimization of mixture according to engine speed or load and decreased minimum direct injection quantity by detection the timing of valve open. This system reduced number of PM and oil dilution, furthermore achieved to improve 3% engine power and 2% fuel consumption.