Fuel supply control apparatus for internal combustion engine and fuel supply control method thereof
First Claim
1. 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:
- an electric power reducing unit which temporarily reduces driving electric power for the electric fuel pump when the internal combustion engine is in a stationary state;
a pressure estimating unit which estimates a change amount of the fuel pressure for when the driving electric power is temporarily reduced; and
an electric power correcting unit which corrects the driving electric power based on the change amount of the fuel pressure, herein the electric power correcting unit includes;
a first comparing unit which judges whether or not the change amount of the fuel pressure is less than a first threshold;
a first correcting unit which reduces the driving electric power when the change amount of the fuel pressure is less than the first threshold;
a second comparing unit which judges whether or not the change amount of the fuel pressure is greater than a second threshold which is equal to or greater than the first threshold; and
a second correcting unit which increases the driving electric power when the change amount of the fuel pressure is greater than the second threshold.
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Accused Products
Abstract
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.
56 Citations
20 Claims
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1. 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:
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an electric power reducing unit which temporarily reduces driving electric power for the electric fuel pump when the internal combustion engine is in a stationary state; a pressure estimating unit which estimates a change amount of the fuel pressure for when the driving electric power is temporarily reduced; and an electric power correcting unit which corrects the driving electric power based on the change amount of the fuel pressure, herein the electric power correcting unit includes; a first comparing unit which judges whether or not the change amount of the fuel pressure is less than a first threshold; a first correcting unit which reduces the driving electric power when the change amount of the fuel pressure is less than the first threshold; a second comparing unit which judges whether or not the change amount of the fuel pressure is greater than a second threshold which is equal to or greater than the first threshold; and a second correcting unit which increases the driving electric power when the change amount of the fuel pressure is greater than the second threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 19)
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10. 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:
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electric power reducing means for temporarily reducing driving electric power for the electric fuel pump when the internal combustion engine is in a stationary state; pressure estimating means for estimating a change amount of the fuel pressure for when the driving electric power is temporarily reduced; and electric power correcting means for correcting the driving electric power based on the change amount of the fuel pressure, wherein the electric power correcting means includes; first comparing means for judging whether or not the change amount of the fuel pressure is less than a first threshold; first correcting means for reducing the driving electric power when the change amount of the fuel pressure less than the first threshold; second comparing means for judging whether or not the change amount of the fuel pressure is greater than a second threshold which is equal to or greater than the first threshold; and second correcting means for increasing the driving electric power when the change amount of the fuel pressure is greater than the second threshold.
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11. 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:
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temporarily reducing driving electric power for the electric fuel pump when the internal combustion engine is in a stationary state; estimating a change amount of the fuel pressure for when the driving electric power is temporarily reduced; and correcting the driving electric power based on the change amount of the fuel pressure, wherein the correcting the driving electric power includes; judging whether or not the change amount of the fuel pressure is less than a first threshold; reducing the driving electric power when the change amount of the fuel pressure is less than the first threshold; judging whether or not the change amount of the fuel pressure is greater than a second threshold which is equal to or greater than the first threshold; and increasing the driving electric power when the change amount of the fuel pressure is greater than the second threshold. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 20)
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Specification