Motors: expansible chamber type – Working member position feedback to motive fluid control – Electrical input and feedback signal means
Patent
1975-01-22
1976-03-16
Maslousky, Paul E.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Electrical input and feedback signal means
91420, 91447, F15B 903, F15B 909
Patent
active
039438244
ABSTRACT:
An electro-hydraulic system for controlling a hydraulic function includes a pump and reservoir connected to the function through an electro-hydraulic control valve, a pair of pilot operated check valves normally preventing fluid flow from the function, a pilot passage between the pump and check valves to pressurize and open the check valves, an electro-hydraulic drain valve connected to the pilot passage, and control means for the control and drain valves. The control means is responsive to a feedback signal from the hydraulic function and an operator-controlled input signal within a predetermined range to close and open the drain and control valves, respectively. The control means may further require the presence of a second input signal, such as a simple reference signal or a signal provided in response to operation of an additional function, before operating the control and drain valves. With this arrangement, the system is fail-safe inasmuch as the hydraulic function will not operate in the event of hydraulic or electrical failure, if the hydraulic function and the operator input signal difference is above or below predetermined maximum and minimum values, or in the absence of the second input signal.
REFERENCES:
patent: 2618121 (1952-11-01), Tucker
patent: 2770098 (1956-11-01), Korkowski et al.
patent: 3826174 (1974-07-01), Platt
patent: R24006 (1955-05-01), Acton
Deere & Company
Maslousky Paul E.
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