초록 ▼

When differential pressure between fuel flowing into a fuel control valve and fuel flowing out of the valve reaches a predetermined value, the biasing force of a compressed coil spring is countered and a shaft in the valve moves to the fuel upstream side so that a valve member is seated to terminate

When differential pressure between fuel flowing into a fuel control valve and fuel flowing out of the valve reaches a predetermined value, the biasing force of a compressed coil spring is countered and a shaft in the valve moves to the fuel upstream side so that a valve member is seated to terminate communication between the fuel inlet passage and the fuel outlet passage. This maintains fuel pressure at the fuel inlet passage and at the fuel outlet passage at different levels so that the fuel supply system maintains a high fuel pressure in the fuel rail to suppress fuel vapor generation during engine stoppage while also yet still providing an appropriate fuel injection pressure during rapid deceleration of the vehicle.

대표청구항 ▼

[ What is claimed is:] [1.] A returnless type fuel supply system, comprising:a fuel pump;a fuel injection valve;a pipe for supplying fuel from the fuel pump to the fuel injection valve for injection to an internal combustion engine;a control unit for controlling the fuel pump by feedback control; an

[ What is claimed is:] [1.] A returnless type fuel supply system, comprising:a fuel pump;a fuel injection valve;a pipe for supplying fuel from the fuel pump to the fuel injection valve for injection to an internal combustion engine;a control unit for controlling the fuel pump by feedback control; anda fuel control valve for shutting off communication between a fuel upstream side and a fuel downstream side of the pipe when a differential pressure .DELTA.P=P.sub.2 -P.sub.1 between fuel pressure P.sub.2 at the fuel downstream side and fuel pressure P.sub.1 at the fuel upstream side is larger than a predetermined positive threshold differential pressure, and for turning on communication between the fuel upstream side and the fuel downstream side when the differential pressure .DELTA.P is lower than the predetermined positive threshold differential pressure, the predetermined positive threshold differential pressure being set to have a predetermined relationship to the peak value of intake air pressure and to a differential pressure between fuel supply pressure and the intake air pressure.