Throttle valve control apparatus of vehicle
US5394847A · kind A · utility
0Cited by
7References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 27, 1993 |
| Grant date | Mar 7, 1995 |
| Priority date | — |
| Expiry date | Jul 27, 2013 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2011/102
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A throttle control system reliably determines failure of a throttle valve driving system. During engine idling, a throttle valve is opened and closed by an actuator. A central processing unit generates a pulse-like drive signal to the actuator through a back-up integrated circuit. When the frequency of the drive signal exceeds a predetermined value, the back-up integrated circuit determines that a failure in the central processing unit has occurred. Since this determination is based on the frequency of the drive signal, a driving system failure can be reliably detected even using pulse-like signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.