Vehicle speed control circuit
US3952829A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 22, 1975 |
| Grant date | Apr 27, 1976 |
| Priority date | — |
| Expiry date | May 22, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P3/60
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for automatically maintaining the speed of a vehicle at a desired road speed as selected by the vehicle operator. When the operator actuates the control circuit, a desired road speed signal proportional to the vehicle road speed at that moment is generated and stored. The stored desired road speed signal is continuously compared with a signal representing the vehicle road speed to generate a duty cycle modulated control signal to a throttle control which adjusts the vehicle throttle to maintain the desired road speed. The generation of the desired road speed signal is synchronized with the vehicle road speed signal to provide an accurate and highly repeatable desired road speed signal. The control circuit also includes an anticipatory control which responds to the operator actuation of the control circuit to pre-position the throttle control as the desired road speed signal is being generated and stored. This reduces the overall response time of the speed control circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.