Patent ID: 6067963
Filing Date: 2000-05-30
Classification: F02M,F16K,Y10T

Abstract:
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.