Control system for controlling the engagement of a pressure-operated actuator
US4535879A · kind A · utility
16Cited by
14References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 29, 1984 |
| Grant date | Aug 20, 1985 |
| Priority date | — |
| Expiry date | Feb 29, 2004 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16D2500/7109
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A smooth, optimum engagement of a pressure-operated actuator, such as a brake or clutch, is obtained by producing a pulse width modulated signal, having a gradually changing duty cycle, which is then used to control a three-way on/off solenoid valve to which is supplied pressurized fluid such as air. The solenoid valve is rapidly switched between pressure in and exhaust out in accordance with the changing duty cycle in order to develop a gradually increasing fluid pressure for application to the actuator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.