Patent ID: 6854445
Filing Date: 2005-02-15
Classification: F02D,F02M

Abstract:
1. A common rail fuel injection apparatus configured so that high-pressure fuel from a common rail for accumulating fuel supplied under pressure from a fuel supply pump is sent through a pressure booster to an injector open/closed controlled by fuel injection control means and wherein pressure boost control in the pressure booster is conducted by using a solenoid valve to regulate an amount of the high-pressure fuel supplied to the pressure booster that is spilled to the low-pressure side, the common rail fuel injection apparatus being characterized in that it comprises: discrimination means for discriminating whether reduction of fuel pressure in the common rail is necessary, spill amount computing means for computing a high-pressure fuel spill amount necessary for pressure reduction when the discrimination means discriminates that pressure reduction is necessary, and solenoid valve control means responsive to the spill amount computing means and the fuel injection control means for open/close controlling the control solenoid valve so as to spill the high-pressure fuel to the low-pressure side at a time point when fuel injection from the injector is not being conducted.