Knock determining apparatus for internal combustion engine

Details Knock determining apparatus for internal combustion engine Knock determining apparatus for internal combustion engine

2005-03-15

2005-03-15

Hofsass, Jeffery (Department: 2636)

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

C340S426300, C340S441000, C340S566000

Reexamination Certificate

active

06867691

ABSTRACT:
The detection output of a knock sensor, which detects knock of an internal combustion engine, is filtered by a filter in which the filtering frequency band is variable. The output of the filter is discriminated by a level discriminating unit with respect to a given determination level. A counter counts number c of times at which the detection output of the knock sensor is equal to or higher than the determination level. A determining unit determines whether knock occurs or not on the basis of the number c. In response to the output of the determining unit, when determination of occurrence of knock is impossible, a correcting unit conducts correction of shifting the filtering frequency band of the filter. Therefore, determination of occurrence of knock is enabled, and the accuracy of knock detection is improved.

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patent: A 9-112333 (1997-04-01), None
patent: A 11-107844 (1999-04-01), None

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