Patent ID: 9458774
Filing Date: 2016-10-04
CPC Classification: F02D,Y02T

Claim Text:
1. A control apparatus for an internal combustion engine, comprising: a controller that is programmed to: obtain in-cylinder pressure of an internal combustion engine; detect presence or absence of abnormal combustion on a basis of the in-cylinder pressure obtained by the controller; and when continuous or substantially continuous abnormal combustion is detected, increase an abnormal combustion allowable number that is allowed until abnormal combustion suppression control which suppresses abnormal combustion is executed when a maximum in-cylinder pressure value at a time of occurrence of abnormal combustion is low, as compared with when the maximum in-cylinder pressure value at the time of occurrence of abnormal combustion is high, wherein the controller estimates a piston temperature increase amount due to occurrence of abnormal combustion, on a basis of a product of a piston temperature increase rate that is set so as to increase with an increase in the maximum in-cylinder pressure value at the time of occurrence of abnormal combustion and an occurrence number of abnormal combustion, and wherein when continuous or substantially continuous abnormal combustion is detected, the controller adjusts execution of the abnormal combustion suppression control so that a piston temperature calculated on a basis of the piston temperature increase amount estimated by the controller becomes lower than a predetermined allowable temperature.