Patent ID: 6276337
Filing Date: 2001-08-21
Classification: F02D

Abstract:
A common-rail fuel-injection system comprising, injectors for spraying fuel during successive cycles into combustion chambers of an engine, a common rail storing therein the fuel to be applied to the injectors, a high-pressure fuel pump for delivery of the fuel to the common rail, detecting means for monitoring engine operating conditions, and a controller unit for regulating fuel injection out of the injectors in compliance with signals transmitted from the detecting means, wherein each cycle of fuel injection has an initial time interval during which an initial quantity of fuel is injected, the controller unit stores therein mapped data of a correlation defined previously between a controlled variable of the fuel injection at the initial time interval of each cycle and a start-delay time that spans from a time any one of the injectors is applied with an instruction to initiate the fuel injection to a time an actual fuel injection starts at the injector, finding on the first mapped data the controlled variable of the fuel injection at the initial time interval in compliance with the start-delay time, finding a desired, controlled variable of the fuel injection at the initial time interval dependent on the signals, whereby the fuel injection out of the injector is controlled such that the controlled variable of the fuel injection is made to conform to the desired, controlled variable of the fuel injection.