Common rail fuel injection apparatus
AssigneeBosch Automotive Systems Corporation
InventorKenji Okamoto
Life of this patent
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Abstract
In a fuel injection apparatus (1) configured so that high-pressure fuel from a common rail (2) is supplied to an injector (8) through a pressure booster (4), it is discriminated whether reduction of the fuel pressure in the common rail (2) is necessary, the spill amount of the high-pressure fuel necessary for pressure reduction is computed when pressure reduction is discriminated to be necessary, and a control solenoid valve (48) is open/close controlled to spill said spill amount of the high-pressure fuel to the low-pressure side at a time point when fuel injection from the injector (8) is not being conducted.
Claims4
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.
Dependencies are inferred from the claim text.