Patent ID: 7806211

Claim:
An internal combustion engine system having an opening and closing timing changing module capable of changing opening and closing timing of an intake valve of an internal combustion engine, said internal combustion engine system comprising: a fuel injection module capable of injecting a fuel to each cylinder of said internal combustion engine; an exhaust gas purifier including a catalyst for purifying exhaust gas from said internal combustion engine; an advance angle instruction module which sets a value for an advance angle instruction flag for advancing opening and closing timing of said intake valve, wherein when predetermined high torque demand is made based on an operation of an operator, the value is set as one, and when it is determined that output of high torque is not demanded, the value is set as zero; an opening and closing timing control module which controls said opening and closing timing changing module so that said intake valve is opened and closed in target opening and closing timing based on an operation state of said internal combustion engine and the value for the advance angle instruction flag; a target fuel injection quantity setting module which sets a basic fuel injection quantity based on target power to be output from said internal combustion engine and a predetermined constraint and sets a target fuel injection quantity by performing an increase correction to said basic fuel injection quantity when a temperature of said catalyst is higher than a predetermined temperature, said increase correction being correction for increasing a fuel injection quantity to said internal combustion engine when the value for the advance angle instruction flag is one as compared to when the value for the advance angle instruction flag is zero; and a fuel injection control module which controls said fuel injection module so that fuel injection is performed based on said set target fuel injection quantity.