Patent ID: 6546915
Filing Date: 2003-04-15
Classification: F02D,Y02T

Abstract:
A fuel injection control apparatus for correcting the basic injection time period calculated from the number of engine revolutions and the throttle opening by a correction expression including the value of the ambient pressure to calculate the corrected injection time period, comprising:first detecting means for detecting a number of engine revolutions; second detecting means for detecting a throttle opening; third detecting means for detecting a negative pressure in an inlet pipe; area determination means for determining the division of the area defined as a function of the number of engine revolutions and the throttle opening in which the engine condition resides out of a plurality of divisions divided based on the offset value that is the difference between the ambient pressure determined under the reference ambient pressure in advance and the negative pressure in the inlet pipe according to the number of engine revolutions and the throttle opening; calculating means for calculating the base value for calculating the alternative ambient pressure by adding the offset value described above provided for each area determined by the area determination means to the negative pressure in the inlet pipe; and ambient pressure value determination means for determining the base value for calculating the alternative ambient pressure as a value of the ambient pressure when the difference between the last determined value of the ambient pressure and the base value for calculating the alternative ambient pressure is not more than the predetermined value.