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AssigneeHitachi Automotive Systems, Ltd.
InventorMasayuki SARUWATARI
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The present invention relates to a fuel supply control apparatus and a fuel supply control method for controlling an electric fuel pump, in an internal combustion engine provided with the electric fuel pump for pumping fuel to a fuel injection valve and a pressure regulator for regulating fuel pressure at set pressure. When a learning condition of a drive voltage for the electric fuel pump is established, the drive voltage is temporarily reduced and a change amount ΔAF of an air-fuel ratio at the time is detected. Then, if the change amount ΔAF is within a first threshold ΔAF1, the drive voltage is reduced, whereas, if the change amount ΔAF is greater than a second threshold ΔAF2 which is equal to or greater than the first threshold ΔAF1, the drive voltage is increased.
A fuel supply control apparatus for controlling an electric fuel pump in an internal combustion engine provided with the electric fuel pump for pumping fuel to a fuel injection valve and a pressure regulator for regulating fuel pressure at set pressure, comprising:
A fuel supply control apparatus for controlling an electric fuel pump in an internal combustion engine provided with the electric fuel pump for pumping fuel to a fuel injection valve and a pressure regulator for regulating fuel pressure at set pressure, comprising:
A fuel supply control method of controlling an electric fuel pump in an internal combustion engine provided with the electric fuel pump for pumping fuel to a fuel injection valve and a pressure regulator for regulating fuel pressure at set pressure, comprising the steps of:
Dependencies are inferred from the claim text.