Knocking detection device
US4440014A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Apr 13, 1982 |
| Grant date | Apr 3, 1984 |
| Priority date | — |
| Expiry date | Apr 13, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L23/223
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An engine knocking detection device has a diaphragm to be disposed in contact with the engine cooling water so as to resonate with pulsations of the pressure of the cooling water caused by engine knockings, and output elements responsive to the vibration of the diaphragm to produce an electrical output signal to be utilized for the control of engine spark timing. The water-contacting surface of the diaphragm is coated with a layer of a hydrophilic material operative to prevent attachment or adhesion of air bubbles to the water-contacting surface of the diaphragm whereby the sensitivity of the diaphragm to the water pressure pulsation is improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.