Patent ID: 6408816
Filing Date: 2002-06-25
Classification: F02B,F02D,Y02T

Abstract:
A control apparatus for a direct-injection spark-ignition internal combustion engine, comprising:a first controlling section that performs a stratified combustion to raise an exhaust temperature under a condition prior to a completion of an engine warm-up, the stratified combustion being provided with a lean air-fuel mixture formed over a whole combustion chamber through a fuel injection at a suction stroke and a rich air-fuel mixture formed in an inner space surrounding a spark plug of the combustion chamber through a fuel injection at a compression stroke; and a second controlling section that corrects a fuel injection quantity of the fuel injection at the suction stroke and a fuel injection quantity of the fuel injection at the compression stroke by use of a feedback correction coefficient so that an average air-fuel ratio over the whole combustion chamber is controlled to be a predetermined target air-fuel ratio, wherein one of the fuel injections whose fuel injection quantity is larger than the other fuel injection is corrected in both increase and decrease directions by use of the feedback correction coefficient, and wherein the other fuel injection is corrected only in an increase direction by use of the feedback correction coefficient.