Patent ID: 8392094

Claim:
A control apparatus for an internal combustion engine, comprising: abnormal combustion detection means for detecting an abnormal combustion due to self-ignition occurring regardless of ignition performed by ignition means for implementing ignition at timing set by ignition timing setting means for setting ignition timing of an air-fuel mixture present in a combustion chamber of the internal combustion engine; pre-ignition determination timing setting means for setting pre-ignition determination timing; pre-ignition determination means for detecting abnormal combustion occurrence timing based on abnormal combustion detection information from the abnormal combustion detection means so as to determine whether or not the abnormal combustion is pre-ignition based on comparison between the pre-ignition determination timing set by the pre-ignition determination timing setting means and the abnormal combustion occurrence timing; heat-source pre-ignition determination timing setting means for setting heat-source pre-ignition determination timing; heat-source pre-ignition determination means for determining whether the pre-ignition is heat-source pre-ignition or compression pre-ignition based on comparison between the abnormal combustion occurrence timing set by the pre-ignition determination means and the heat-source pre-ignition determination timing set by the heat-source pre-ignition determination timing setting means; first avoidance means for avoiding the heat-source pre-ignition in a case where the pre-ignition is determined as the heat-source pre-ignition; and second avoidance means for avoiding the compression pre-ignition in a case where the pre-ignition is determined as the compression pre-ignition, wherein: upon detection of the abnormal combustion, the first avoidance means determines that the pre-ignition is the heat-source pre-ignition and implements avoidance of the heat-source pre-ignition when the abnormal combustion occurrence timing is on an advance side of the pre-ignition determination timing set by the pre-ignition determination timing setting means and is on an advance side of the heat-source pre-ignition determination timing set by the heat-source pre-ignition determination timing setting means; and upon detection of the abnormal combustion, the second avoidance means determines that the pre-ignition is the compression pre-ignition and implements avoidance of the compression pre-ignition when the abnormal combustion occurrence timing is on the advance side of the pre-ignition determination timing set by the pre-ignition determination timing setting means and is on a retard side of the heat-source pre-ignition determination timing set by the heat-source pre-ignition determination timing setting means.