Patent ID: 9309828
Filing Date: 2016-04-12
CPC Classification: F02D,F02M

Claim Text:
1. A fuel supply apparatus supplying a fuel to an internal combustion engine through an accumulator in which the fuel is accumulated at a high pressure, comprising: a pump unit having a high-pressure pump and an amount adjusting portion; and a control unit controlling the pump unit; and a relief valve releasing the fuel from the accumulator in accordance with an opening degree of the relief valve, wherein the high-pressure pump suctions the fuel, pressurizes the fuel and discharges the fuel to the accumulator, the amount adjusting portion adjusts an amount of the fuel which is suctioned by the high-pressure pump and adjusts the amount of the fuel which is discharged by the high-pressure pump in accordance with an amount of an electric power supplied to the amount adjusting portion, the control unit stores an control characteristic of the amount adjusting portion, which shows a correlation between the amount of electric power and a discharge amount of the high-pressure pump, the control unit calculates a requesting discharge amount for bringing the fuel pressure in the accumulator to substantially agree with a target pressure, the control unit calculates a target electric power based on the requesting discharge amount in view of the control characteristics, the control unit corrects the target electric power in such a manner as to increase an actual discharge amount of the high-pressure pump, the control unit defines a start mode in which the target electric power obtained by applying the requesting discharge amount to the control characteristics is calculated as a final target electric power so that the actual discharge amount is increased, the final target electric power is computed by using of a common correction value so that the fuel pressure in the accumulator substantially agrees with the target fuel pressure even if the pump unit individually shows a largest variation of the discharge amount, wherein the common correction value is shared among individual supply pump, and in the start mode, the relief valve and the amount adjusting portion are controlled in such a manner that the fuel pressure in the accumulator substantially agrees with the target fuel pressure.