Vehicle alarm system having a vibration-sensitive motion detector
US4358750A · kind A · utility
17Cited by
13References
10Claims
0Family size
Inventor
Key dates
| Filing date | Oct 20, 1978 |
| Grant date | Nov 9, 1982 |
| Priority date | — |
| Expiry date | Oct 20, 1998 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60R25/1007
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
In a vehicle alarm system there is provided apparatus for producing a digital control signal that defines a command to initiate a timing operation such as an entry delay. The apparatus comprises a transducer, preferably including a piezoelectric device, for generating an electrical waveform that, while the vehicle is undergoing vibration, has an acceleration-representing analog signal component. The apparatus further comprises threshold-setting circuitry responsive to the electrical waveform for causing the initiate-timing command to be given when the acceleration representing signal component exceeds a predetermined threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.