Fluid-pressure and analogous brake systems – With pump
Patent
1982-09-27
1983-09-06
Butler, Douglas C.
Fluid-pressure and analogous brake systems
With pump
303 3, 303116, 303119, B60T 802, F15B 102
Patent
active
044025548
ABSTRACT:
Pressure control systems for a pressure accumulator are known in which the pressure accumulator is fed by a controllable pump. When the pressure accumulator serves to supply at least two user components each requiring a different minimum feed pressure for correct operation, it is desired to provide a pressure control system which is safe in its mode of operation, simple in its construction and needs little energy for maintaining the feed pressure. This is accomplished according to the present invention by a switching device which switches on the pump when the accumulator pressure falls below a first threshold value corresponding to lowest minimum feed pressure of the two user components and which switches off the pump when the accumulator pressure reaches a second threshold value corresponding to the highest minimum feed pressure of the two user components with the switching device responding to the return pressure from that one of the two user components having the highest minimum feed pressure when operated to raise the first threshold value to approximately the second threshold value.
REFERENCES:
patent: 2629537 (1953-02-01), Graybrook et al.
patent: 2945352 (1960-07-01), Stelzer
patent: 2976807 (1961-03-01), Hill
patent: 3279377 (1966-10-01), Jacobson
patent: 3756666 (1973-09-01), Leiber
patent: 3836206 (1974-09-01), Leiber
patent: 4033637 (1977-07-01), Leiber
patent: 4305624 (1981-12-01), Belart et al.
Vickers Handbook of Hydraulics, 1966, pp. 96-97.
"Outlines of Practical Control Technology", published by R. Oldenbourg, 1967, pp. 135-139, from the book by Dr. Ing. Erwin Samal.
Butler Douglas C.
Hill Alfred C.
IT&T Industries, Inc.
O'Halloran John T.
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