Cylinder pressure monitoring system
US4227403A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 29, 1979 |
| Grant date | Oct 14, 1980 |
| Priority date | — |
| Expiry date | Jan 29, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L23/22
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Disclosed is a transducer assembly and diagnostic apparatus for processing an electrical signal which varies with the pressure changes occurring within an engine cylinder. The transducer assembly consists of a U-shaped structure integrally formed in a sandwich arrangement and encompassing a pressure-responsive crystalline element. The assembly is sized such that it substantially encompasses the shank of a spark or glow plug of the engine such that axial forces from within the cylinder excite the transducer through the plug to produce a signal which is processed in an electrical circuit to provide timing or other diagnostic information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.