Patent ID: 7467039
Filing Date: 2008-12-16
Classification: F02D

Abstract:
1. A revolution control apparatus of an internal combustion engine that performs engine revolution feedback control in which an engine revolution of the internal combustion engine, which has a plurality of cylinders, is detected and a fuel injection amount from fuel injection means is controlled so that the detected engine revolution approaches a target revolution, comprising: revolution calculation and storage means for calculating, from a time that is required for a crank shaft to rotate by a predetermined angle from a compression upper dead center of each cylinder, the engine revolution in an expansion stroke of that cylinder, and storing this in association with that cylinder number; and revolution feed and feedback revolution calculation means that, in determining the fuel injection amount based on the engine revolution that has been associated with that cylinder number and the target revolution, feeds back a revolution that is obtained by retroactively averaging the stored revolutions from the cylinder immediately prior to the cylinder before the cylinder that is immediately prior as the engine revolution, and calculates a feedback revolution by switching a number of retroactive cylinders according to an operation state of said internal combustion engine so as to control the revolution of the engine, wherein said revolution feed and feedback revolution calculation means feeds back a revolution that is obtained by averaging the revolution from the cylinder immediately prior to a cylinder before the cylinder that is immediately prior in a case where it has determined that said internal combustion engine is in a steady operation state.