Development of Stratified-Charge Engine by Impingement of Fuel Jet : Test Results with Gasoline Fuel

Abstract

New mixture formation technology (OSKA) of a direct fuel injection stratified-charge engine was developed by making a fuel jet against an impingement part provided in the piston cavity. A four-stroke single cylinder spark ignition engine with the OSKA system was examined with gasoline fuel. A single hole nozzle with relatively low opening pressure was used. As the fuel-air mixture is formed mostly in the cavity, it is possible to prevent end-gas knocking, and to employ compression ratio 14.2 higher than that of the conventional premixed SI engine. The test results showed that the high brake mean effective pressure of 1.04 MPa and high brake thermal efficiency of 37.7 % were obtained.