Patent ID: 7527039
Filing Date: 2009-05-05
Classification: F02D

Abstract:
1. A fuel injection control apparatus of an internal combustion engine having a plurality of cylinders, the apparatus comprising: a fuel injection apparatus for injecting fuel into the cylinders; a crank angle detector including a signal rotor having a plurality of tooth portions aligned along the circumference at intervals of a constant angle and a toothless portion provided in an angular range which is greater than the interval at which the tooth portions are aligned, wherein the crank angle detector outputs a first signal corresponding to each of the tooth portions and a second signal corresponding to the toothless portion as the signal rotor rotates; and a control section for calculating a time required for the signal rotor to rotate by a predetermined angle using a signal outputted from the crank angle detector and calculating the timing of fuel injection using the calculated time, wherein the control section selectively carries out a first calculation process for calculating the timing of fuel injection using the first signal outputted from the crank angle detector and a second calculation process for calculating the timing of fuel injection using the second signal outputted from the crank angle detector, and wherein, when carrying out the second calculation process, the control section calculates the timing of fuel injection using the length of time gained by dividing the length of time gained through detection of the toothless portion by the number of tooth portions which can be aligned in the toothless portion at the constant intervals.