Patent ID: 7908073
Filing Date: 2011-03-15
Classification: F02D,Y02T

Abstract:
1. A control apparatus for an internal combustion engine, comprising: a fuel supply device that supplies fuel in a fuel tank to said internal combustion engine; an air fuel ratio detection unit that is arranged in an exhaust system of said internal combustion engine for detecting an air fuel ratio in an exhaust gas from said internal combustion engine; an air fuel ratio correction amount calculation unit that calculates an amount of air fuel ratio correction for correcting an amount of injection fuel supplied to said internal combustion engine based on the air fuel ratio detected by said air fuel ratio detection unit; an estimation permission determination unit that makes a determination that a starting condition for estimation of a concentration of said fuel holds when said air fuel ratio correction amount becomes out of a range of a predetermined threshold, and sets a permission time for said concentration estimation in accordance with a first accumulated amount of injection fuel which is obtained by summing said amount of injection fuel supplied to said internal combustion engine after said starting condition for concentration estimation holds; a concentration estimation unit that calculates the estimated value of a concentration of a single component of said fuel based on said air fuel ratio correction amount during the time when said concentration estimation is permitted by said estimation permission determination unit; and a fuel injection amount calculation unit that corrects said amount of fuel to be injected in accordance with said air fuel ratio correction amount and said estimated concentration value.