Cruise control method and apparatus
US4121273A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 14, 1977 |
| Grant date | Oct 17, 1978 |
| Priority date | — |
| Expiry date | Jan 14, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60K31/045
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A cruise control system having means to provide a signal corresponding to a desired speed for use by a servo control to regulate the speed. This system uses a current source to ramp charge a first capacitor. A comparator compares magnitude of the voltage on the first capacitor against the signal representative of the desired speed. A first counter is used to accumulate counts from a first frequency generator. A latch counter capable of following the counts in the first counter is used to store the counts when the comparator indicates the voltage on the first capacitor is substantially equal to the magnitude of the signal representative of the speed. A digital comparator then compares the counts stored in the latch counter against counts being accumulated anew in the first counter while the first capacitor is being recharged. Means are provided to inhibit the first capacitor from being charged further after the digital comparator indicates equality between the quantity of the counts being compared. Means to transfer the voltage on the first capacitor to a second capacitor are used so that the voltage on the second capacitor can be compared against the signal representative of the ac…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.