Motors: expansible chamber type – Working member position feedback to motive fluid control – Electrical input and feedback signal means
Patent
1987-03-30
1990-03-13
Garrett, Robert E.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Electrical input and feedback signal means
91364, 91459, 318431, 318599, 172 2, F15B 1316
Patent
active
049074938
ABSTRACT:
A system for the control of a fluid flow control valve which controls the supply of fluid to an actuator to control the movement of a component such as a tractor implement hitch in response to a selected operating parameter such as hitch position or draft force. The system enables the desired value of the selected parameter to be set and this desired value is compared with the actual sensed value of the parameter to provide a parameter error signal. A start-up control function is provided to improve the initial speed of response of the system. The start-up control function is arranged on each detection of a parameter error signal to apply a start-up signal to the valve to initiate movement of the component and, if no movement results, to increase the start-up signal until movement of the component is detected whereupon the increase in the start-up signal is stopped and the magnitude of the signal applied to the valve is dependent on the parameter error signal so as to tend to reduce the error signal to zero.
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Bellanger Regis
Graaskamp William J.
Farris Robert L.
Garrett Robert E.
Kapsalas George
Massey-Ferguson Services N. V.
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