Heat measuring system for detecting knock in internal combustion engine
US5206809A · kind A · utility
13Cited by
5References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 7, 1992 |
| Grant date | Apr 27, 1993 |
| Priority date | — |
| Expiry date | Apr 7, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L23/225
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A knock detecting system for internal combustion engines which includes a heat quantity computing unit for deriving a heat quantity produced in every engine cycle, on the basis of the fluctuations in a combustion pressure waveform in which high-frequency components having frequencies higher than a predetermined cut-off frequency being removed from a fluctuation waveform of detected combustion pressure. The knock detecting system also includes a knock intensity computing units which derives knock intensity on the basis of a ratio of a heat quantity produced by knocking to a heat quantity produced by normal combustion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.