CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE

摘要

Disclosed is an internal combustion engine control device that is capable of satisfying a demand for raising the temperature of a catalyst by controlling a variable valve device in such a manner as to adjust the amount of internal EGR. The control device monitors an air-fuel ratio, which is obtained from an air-fuel ratio sensor or calculated from an intake air amount and a fuel injection amount, and a torque fluctuation, which is detected from an engine speed fluctuation, and feeds the monitoring results back to the control of the variable valve device (or more specifically the timing of early closing of an exhaust valve 56) in such a manner as to remain within an A/F suitability range. When feedback control is exercised as described above, autonomous model control of VVT can be exercised to achieve combustion while a large amount of EGR is provided.