Control system for controlling the engagement of a pressure-operated actuator
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United States of America Patent
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-
Aug 20, 1985
Grant Date -
N/A
app pub date -
Feb 29, 1984
filing date -
Feb 29, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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