Spark generating apparatus having strain gage cylinder pressure measurement feature
US6799451B2 · kind B2 · utility
6Cited by
7References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 5, 2001 |
| Grant date | Oct 5, 2004 |
| Priority date | — |
| Expiry date | Jul 25, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L23/18
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An ignition coil, spark plug, and pressure sensor for an internal combustion engine are, in a preferred embodiment, integrated into a single assembly and mounted directly on a plug hole of an internal combustion engine. A hard spark plug shell serves as a pressure member and on which a strain gage is affixed. Changes in the pressure in the combustion chamber deform the shell, causing a corresponding change in the resistance of the strain gage. A bridge circuit or the like is used to measure the resistance change thereby providing a direct indication of cylinder pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.