Patent ID: 6814046
Filing Date: 2004-11-09
Classification: F02B,F02D,Y02T

Abstract:
A direct fuel injection engine comprising:a combustion chamber; a piston including a top surface having a cavity at a substantially center portion of the top surface, the cavity being defined at least by a peripheral wall surface and a bottom surface; a fuel injection valve positioned at an upper portion of the combustion chamber substantially on a center axis of the piston, the fuel injection valve being configured and arranged to directly inject a fuel stream inside the combustion chamber in a substantially constant hollow circular cone shape during a compression stroke when the direct fuel injection engine is operating in a stratified combustion region; a spark plug configured and arranged to ignite the fuel; and a control unit configured and arranged to control operations of the fuel injection valve and the spark plug, the control unit being further configured and arranged to ignite a first air-fuel mixture formed directly after the fuel stream is injected from the fuel injection valve and prior to a majority of the fuel stream striking the cavity when the direct fuel injection engine is operating in a low-load stratified combustion region, the control unit being further configured and arranged to ignite a second air-fuel mixture formed after a majority of the fuel stream is guided toward an upper portion of the combustion chamber above the cavity by the bottom surface of the cavity after the fuel stream first hits the peripheral wall surface of the cavity when the direct fuel injection engine is operating in a high-load stratified combustion region.