Patent ID: 7739026

Claim:
A control apparatus for a combustion engine of a premixed compression self-ignition type, for compressing a mixture of a fuel and an oxygen-containing gas in a combustion chamber to cause combustion thereof through self-ignition, and setting a sealing period during which both an intake valve and an exhaust valve are closed around an exhaust top dead center to cause burnt gas to remain as an internal EGR gas in the combustion chamber, the control apparatus comprising: a temperature sensor for detecting a temperature of intake air; a revolution number sensor for detecting a revolution number of the combustion engine; a load sensor for detecting an operational state of the combustion engine to output the detected operational state as a load signal; a supercharger of a variable supercharging pressure type disposed in an intake passage; an external EGR mechanism for recirculating part of exhaust gas in an exhaust passage as an external EGR gas to the intake passage at a position upstream of the supercharger; and a control unit for grasping a current revolution number and a current magnitude of a load based on a signal from the revolution number sensor and a signal from the load sensor, respectively, and controlling the supercharger and the external EGR mechanism such that a supercharging pressure rises and an amount of the external EGR gas increases as a temperature of intake air detected by the temperature sensor rises when it is determined that the combustion engine is operated in a preset high-revolution/high-load range.