Control system with tri-pressure selector network
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United States of America Patent
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-
May 24, 1994
Grant Date -
N/A
app pub date -
Dec 17, 1992
filing date -
Dec 17, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The invention is an improvement in a control system having first, second and third sources of fluid at differing pressures. The improvement comprises a tripath pressure selector network connected to the first and second sources. A pressure-sensing device connects the network and the third source when the third source is at a predetermined minimum pressure. The invention has particular utility in mobile construction machinery having, e.g., steering, implement and brake hydraulic circuits, at differing pressures. In one embodiment, the third source is a brake hydraulic circuit. The improvement helps assure that adequate pilot pressure is available for a 'downstream' pilot control valve.
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