Knock determining apparatus for internal combustion engine
US6867691B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 5, 2002 |
| Grant date | Mar 15, 2005 |
| Priority date | — |
| Expiry date | Feb 6, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L23/225
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.