CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE

摘要

An object of this invention is to suppress the occurrence of pre-ignition by appropriately controlling a wall surface temperature of a combustion chamber based on a target temperature region in which the frequency with which pre-ignition occurs is reflected, without causing pre-ignition to actually occur.;An ECU 50 acquires a wall surface temperature of a combustion chamber 14 or an engine water temperature or the like that correlates therewith as a wall temperature parameter. The ECU 50 is equipped with data for a pre-ignition suppression temperature region that is a region in which the pre-ignition occurrence frequency is smallest among temperature regions of the wall temperature parameter. In a pre-ignition susceptibility operating region A, the wall temperature parameter is controlled so as to fall within the pre-ignition suppression temperature region by operating a cooling water amount varying mechanism 38.

主权项

1. A control device for an internal combustion engine, comprising:
wall temperature parameter acquisition unit for acquiring a cylinder wall temperature of an internal combustion engine or a parameter corresponding to the cylinder wall temperature as a wall temperature parameter; cylinder wall temperature varying unit that is capable of changing the cylinder wall temperature; pre-ignition temperature region storage unit in which a pre-ignition suppression temperature region in which a pre-ignition occurrence frequency decreases more than in a peripheral temperature region is previously stored, the pre-ignition suppression temperature region being a temperature region that is set based on a relation between a pre-ignition occurrence frequency and the cylinder wall temperature; and cylinder wall temperature control unit for, in a case where an actual operating region that is a region in which the internal combustion engine is actually operating is within a predetermined pre-ignition susceptibility operating region, performing control using the cylinder wall temperature varying unit so that the wall temperature parameter falls within the pre-ignition suppression temperature region; wherein the cylinder wall temperature control unit is configured to raise the wall temperature parameter in a case where the wall temperature parameter is lower than the pre-ignition suppression temperature region, and configured to decrease the wall temperature parameter in a case where the wall temperature parameter is higher than the pre-ignition suppression temperature region.