Apparatus for detecting knocking of internal combustion
US6947829B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 14, 2004 |
| Grant date | Sep 20, 2005 |
| Priority date | — |
| Expiry date | Apr 14, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L23/225
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus is provided for detecting an occurrence of knocking of an engine from a signal sensed by a knocking sensor for the engine. The apparatus comprises plural filters extracting, from the signal, plural signal components whose frequency bands mutually differ and a unit determining whether or not there is the occurrence of knocking, based on results outputted from the plural filters. The plural filters include first and second types of filters. The first type of filter has a pass band set to a specific frequency band including a specific frequency of the signal. This specific frequency indicates the occurrence of knocking. The second type of filter has a pass band set to another specific frequency band. An inclination of a filtering characteristic of the second type of filter at a cut-off frequency thereof is steeper than that the first type of filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.