초록 ▼

A common rail delivers fuel to a fuel injection valve for injecting fuel directly into each combustion chamber of a direct injection type gasoline engine. A connected accumulator incorporates a gas-sealed type damper. A body portion of the damper can stretch and shrink by being constructed of a meta

A common rail delivers fuel to a fuel injection valve for injecting fuel directly into each combustion chamber of a direct injection type gasoline engine. A connected accumulator incorporates a gas-sealed type damper. A body portion of the damper can stretch and shrink by being constructed of a metallic bellows, and gas is sealed in the metallic bellows. The pressure at which the gas is initially sealed within the damper is set for 4 Mpa or more, more preferably, for 8 Mpa or more. Further, to secure suppression of a variation in normal operation fuel pressure (for example, 10-12 Mpa), the pressure at which the gas is initially sealed within the damper is set to be lower than the normal operation fuel pressure, more preferably, lower than the normal operation fuel pressure by 1 Mpa or more.

대표청구항 ▼

[ What is claimed is:] [1.]1. A fuel supply apparatus for improving engine starting performance in a direct injection type gasoline engine having a combustion chamber, said apparatus comprising:a fuel pump driven by said engine for pressurizing and pumping fuel;a common rail for accumulating fuel se

[ What is claimed is:] [1.]1. A fuel supply apparatus for improving engine starting performance in a direct injection type gasoline engine having a combustion chamber, said apparatus comprising:a fuel pump driven by said engine for pressurizing and pumping fuel;a common rail for accumulating fuel sent from said engine-driven fuel pump;a fuel injection valve for injecting fuel delivered from said common rail directly into said combustion chamber; anda damper, in which gas is sealed, in communication with fuel in said rail, said damper stretching and shrinking in a direction to suppress variation in fuel pressure in said common rail, said gas being initially sealed within said damper at a pressure of 4 MPa or more, said pressure at which said gas is initially sealed within said damper being greater than that required for atomizing fuel in a direct injection type fuel supply system, and said pressure at which said gas is initially sealed within said damper precluding movement of said damper at engine start-up until fuel pressure in said common rail is increased to a predetermined pressure required for atomizing fuel, and allowing said damper to move to suppress variation in fuel pressure in said common rail after fuel pressure in the common rail exceeds said predetermined pressure required for atomizing fuel, and wherein fuel pressure in the common rail is decreased when the engine stops.