Control device for internal combustion engine

摘要

An engine includes variable valve mechanisms and a variable compression ratio mechanism. An ECU executes temperature balance control when a fuel-cut operation is executed. In the temperature balance control, valve opening characteristics of an exhaust valve are controlled based on a magnitude relation between an actual catalyst temperature and a target catalyst temperature and a magnitude relation between a water temperature and a required cylinder wall temperature. When executing a fuel-cut operation, it is thereby possible to control both the actual catalyst temperature and the water temperature in a well-balanced manner so that the actual catalyst temperature falls within a temperature range suitable for operation of the catalysts, and the water temperature becomes close to the required cylinder wall temperature.

主权项

1. A control device for an internal combustion engine, comprising:
an exhaust purification catalyst that purifies exhaust gas that is discharged from a cylinder of the internal combustion engine; an exhaust valve timing varying mechanism for variably setting valve opening characteristics of an exhaust valve; catalyst temperature acquisition unit for detecting or estimating a temperature of the exhaust purification catalyst as an actual catalyst temperature; target catalyst temperature setting unit for setting a catalyst temperature that is suitable for operation of the exhaust purification catalyst as a target catalyst temperature; cylinder wall temperature detection unit for detecting a cylinder wall temperature that is a wall surface temperature of the cylinder; required cylinder wall temperature calculation unit for calculating a cylinder wall temperature that is required when reverting from a fuel-cut operation as a required cylinder wall temperature; and temperature balance control unit for controlling the valve opening characteristics of the exhaust valve by means of the exhaust valve timing varying mechanism based on a magnitude relation between the actual catalyst temperature and the target catalyst temperature and a magnitude relation between the cylinder wall temperature and the required cylinder wall temperature at a time that a fuel-cut operation is executed.