Device for determining engine knocking intensity from detected variations in engine cylinder internal pressure
US5311765A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 18, 1991 |
| Grant date | May 17, 1994 |
| Priority date | — |
| Expiry date | Dec 18, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L23/225
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
This invention relates to an engine knocking detector for determining knocking intensity from the oscillation waveform of the cylinder internal pressure. The total amount of heat generated in the combustion chamber during one revolution of the crankshaft is computed from the pressure waveform from which high frequency components have been eliminated, and from the running state of the engine. Also, the knocking start point during one revolution of the crankshaft is determined by comparing high frequency components extracted from the waveform and a predetermined reference value, and the amount of heat due to knocking is computed. A knocking intensity is then determined by comparing these two amounts of heat. By detecting knocking based on this comparison of amounts of heat generated in the combustion chamber, the knocking can be detected with high precision by means of a common logic irrespective of engine differences, installation positions of cylinder internal pressure sensors and individual sensor differences.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.