Switch monitoring system
US6415657B1 · kind B1 · utility
1Cited by
10References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 11, 2000 |
| Grant date | Jul 9, 2002 |
| Priority date | — |
| Expiry date | Oct 5, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2041/2055
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A switch monitoring system for measuring closure time of a switch in a vehicle when the vehicle ignition switch is off. The switch monitoring system includes an application specific integrated circuit, a low powered stand-by voltage source, and external interface circuitry connected to the switch, The switch monitoring system uses very little current to operate the time base and switches off completely after switch closure has been captured, thus preventing excessive battery drain. The microprocessor software can obtain the time to closure at the next vehicle power-up sequence.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.