Patent ID: 7500471
Filing Date: 2009-03-10
Classification: F02D,Y02T

Abstract:
1. A pressure accumulation-type fuel injection device provided with a fuel pump that delivers fuel under pressure, a common rail that holds the fuel that has been delivered under pressure by the fuel pump, and a fuel injection valve that injects fuel that has been supplied from the common rail, comprising: injection amount determination means for determining a fuel injection amount of said fuel injection valve according to engine operating state; injection start time determination means for determining a fuel injection start time of said fuel injection valve according to engine operating state; pressure detection means for detecting a common rail pressure at a fuel injection start time that has been determined by said injection start time determination means; and injection duration calculation means that receives a detection signal on the common rail pressure when said pressure detection means detects the common rail pressure, and calculates a fuel injection duration that is in accordance with that common rail pressure and the injection amount that has been determined by said injection amount determination means, wherein the fuel injection operation of said fuel injection valve is ended at the point that the fuel injection duration that has been calculated by said injection duration calculation means has elapsed from a fuel injection start time of said fuel injection valve, and wherein in said injection start time determination means, the fuel injection start time of said fuel injection valve according to an engine operating state is calculated by a crank angle unit, and then a fuel start crank angle is divided into a pulse number of a detection unit angle and the crank angle of less than the detection unit, and the crank angle of less than the detection unit is calculated by a time unit based on an engine revolution.