Knocking detection apparatus and internal combustion engine control apparatus
AssigneeHitachi Automotive Systems, Ltd.
InventorsYoshihiko Akagi, Masashi Seimiya, Seiji Asano, Wataru Katou, Masanori Nukui, Masahiro Sato
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Abstract
Provided is a knocking detection apparatus capable of reducing erroneous determination of knocking during transition, and improving knocking detection accuracy regardless of whether an engine is in steady operation or transient operation. A knocking detection apparatus according to the present invention estimates a background level based on an operating state of an internal combustion engine, and calculates a knocking determination index by using the estimated value.
Claims9
A knocking detection apparatus for detecting knocking of an internal combustion engine, comprising:
- a vibration sensor which detects vibration of the internal combustion engine;
- a frequency analyzer which extracts two or more frequency components from the vibration detected by the vibration sensor;
- a smoothing device which calculates background levels of the vibration of the internal combustion engine by smoothing the frequency components;
- a background level estimator which acquires estimated values of the background level of the internal combustion engine based on an operating state of the internal combustion engine;
- an index calculator which calculates a knocking index indicating whether knocking of the internal combustion engine has occurred by using the frequency components, the background levels, and the estimated values;
- and
- a determination device which determines whether knocking of the internal combustion engine has occurred by comparing the knocking index and a determination threshold.
Dependencies are inferred from the claim text.