Abnormal combustion detection apparatus and method for internal combustion engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsKatsuhiko Arisawa, Shinichi Okabe, Tokio Kohama, Kiyohito Watanabe
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Abstract
An abnormal combustion detection apparatus for an internal combustion engine quickly detects the occurrence of preignition by using a knock sensor. When the knock sensor detects an engine knocking, the ignition timing is delayed. If despite the delay of ignition timing, the knocking is not decreased and the air-fuel ratio detected after the delay of ignition timing is less than the air-fuel ratio detected before the delay of ignition timing, it is determined that preignition has occurred.
Claims14
An abnormal combustion detection apparatus for an internal combustion engine, comprising:
- means for detecting knocking that occurs during combustion in the internal combustion engine;
- means for detecting an air-fuel ratio of a combustion gas;
- means for delaying an ignition timing when knocking is detected by the vibration detection means;
- means for determining whether knocking has been decreased by the delaying of the ignition timing performed when knocking is detected;
- means for comparing an air-fuel ratio detected before the delaying of the ignition timing to an air-fuel ratio detected after the delaying of the ignition timing;
- and
- means for determining that preignition has occurred when, despite the delaying of the ignition timing, the knocking has not decreased and the air-fuel ratio detected after the delaying of the ignition timing is less than the air-fuel ratio detected before the delaying of the ignition timing.
An abnormal combustion detection apparatus for an internal combustion engine, comprising:
- a vibration detecting sensor for detecting a vibration that occurs during combustion in the internal combustion engine;
- an air-fuel ratio detecting sensor for detecting an air-fuel ratio of a combustion gas;
- means for delaying, when a vibration is detected by the vibration detecting sensor, an ignition timing;
- means for determining whether the vibration is reduced by the delaying of the ignition timing performed when the vibration is detected;
- means for comparing an air-fuel ratio detected before the delaying of the ignition timing and an air-fuel ratio detected after the delaying of the ignition timing;
- and
- means for determining that preignition has occurred when, despite the delaying of the ignition timing, it is determined that the vibration has not decreased and it is determined that the air-fuel ratio detected after the delaying of the ignition timing is less than the air-fuel ratio detected before the delaying of the ignition timing.
An abnormal combustion detection method for an internal combustion engine, comprising the steps of:
- detecting a vibration that occurs during combustion in the internal combustion engine;
- and
- determining that preignition has occurred when, despite the delaying of an ignition timing performed by an ignition timing control means it is determined that the vibration has not decreased and it is determined that an air-fuel ratio detected after the delaying of the ignition timing is less than an air-fuel ratio detected before the delaying of the ignition timing.
Dependencies are inferred from the claim text.