Speed responsive systems
US3983954A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 13, 1975 |
| Grant date | Oct 5, 1976 |
| Priority date | — |
| Expiry date | Jan 13, 1995 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D31/002
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A speed responsive system, particularly for motor vehicles, whereby the vehicle may be maintained at a predetermined speed. Voltages dependent on vehicle speed and rate of change of speed are compared with a reference voltage representing a desired speed and the resultant output is compared with a periodic signal to produce output pulses of constant frequency and of a width varying with the relative magnitudes of the input voltages. These pulses are applied to an electromagnetic valve which controls the admission of pulses of reduced gas pressure from the vehicle engine inlet manifold to a chamber of variable volume and the resultant movement of a wall of said chamber is employed to control the engine throttle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.