Speed control systems for governing the speed of a vehicle
US4365298A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 5, 1980 |
| Grant date | Dec 21, 1982 |
| Priority date | — |
| Expiry date | May 5, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T7/12
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A tachometer signal provides input to first and second parallel connected channels, each of the channels comprising in series operational amplifier, threshold detector, and counting devices. A comparator checks that the same count is registered by the counters of both channels. Each of the threshold detectors is biased to require a minimum amplitude over and under tachometer pulse input in order to deliver an output to the pulse counter of the associated channel. Attenuating circuits act on the inputs of the operational amplifiers of both channels during predetermined intervals to check that the amplitude of the tachometer pulses is sufficient to be counted by the tachometer counters. Dynamic checking circuits are provided to check the integrity of the attenuating system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.