Misfire sensor
US5837887A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 6, 1996 |
| Grant date | Nov 17, 1998 |
| Priority date | — |
| Expiry date | Mar 6, 2016 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02B2075/027
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A sensor element for detecting misfire in an internal combustion engine includes: a detecting unit including a piezoelectric film consisting essentially of a ceramic material, a first electrode coated onto at least a portion of the outer surface of the piezoelectric film, and a second electrode coated onto at least a portion of the inner surface of the piezoelectric film; a vibrating portion consisting essentially of a second ceramic material, the detecting unit being placed on the vibrating portion so that the second electrode is coated onto at least a portion of the vibrating portion; and a fixing portion for fixing the vibrating portion so that the vibrating portion may vibrate. In the misfire sensor, the piezoelectric film converts the sound of a combustion explosion into an electric signal. The misfire sensor is excellent in precise misfire detection and durability at low cost.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.