Acceleration sensor and acceleration detection system
US6513383B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 4, 2001 |
| Grant date | Feb 4, 2003 |
| Priority date | — |
| Expiry date | Jun 4, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60R2021/01006
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
The present invention relates to an acceleration sensor which can be provided in a place with extreme ambient temperature variations, for example, near a vehicle engine, and an acceleration detecting system having the acceleration sensor, which are used to control an occupant protection device such as an airbag. In an acceleration sensor (1, 40, 50, 160), gain of an amplifier circuit (4, 5, 6, 41, 42, 43, 51) which differentially amplifies outputs of a piezo-electric element (3) is adjusted by temperature compensation means (9), and thereby an output-temperature characteristic of the piezo-electric element (3) is compensated. Also, a capacitor (8) is inserted in parallel with the piezo-electric element (3), and thereby a composite capacity is increased. By this, a lower cut-off frequency is set to a lower frequency without increasing resistor values of a bias resistor circuit (7). The acceleration sensor (1, 40, 50,160) is provided in a front part of a vehicle, and its sensor output is received by a receiving circuit (2, 80, 90,161) provided in a vehicle room.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.