Vibration sensor for an automotive vehicle
US4373378A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 30, 1980 |
| Grant date | Feb 15, 1983 |
| Priority date | — |
| Expiry date | Oct 30, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01H11/08
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A vibration sensor for an automotive vehicle having a multi-peak vibration characteristic of wider responsiveness and of a higher S/N ratio. The vibration sensor comprises a plurality of piezoelectric vibrators so arranged that the piezoelectric voltage signals from the vibrators are synthesized in reverse polarity between two elements having two adjacent resonant frequencies, when the element are deformed in the same direction. Therefore, the voltages are synthesized in the same polarity, when engine knocking frequency lies between two adjacent sensor resonant frequencies, because a vibrator is 180 degrees out of phase with another adjacent vibrator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.