Power plants – Pressure fluid source and motor – Having condition responsive control in a system of distinct...
Patent
1992-01-13
1993-02-02
Look, Edward K.
Power plants
Pressure fluid source and motor
Having condition responsive control in a system of distinct...
60459, 91518, 91532, F16D 3102
Patent
active
051829088
ABSTRACT:
An apparatus controls a fluid system of a work vehicle. The work vehicle has an engine and at least one fluid circuit which has a pump driven by the engine. A plurality of control valves controllably pass fluid from the pump to a plurality of respective work elements. The control valves have movable valve stems. A work attachment which has a respective control valve is added to the fluid system. A plurality of operator control elements provide demand signals in response to selected settings. Each demand signal is indicative of a requested fluid flow to a respective work element or work attachment. A memory device stores select parameters of the fluid system. One of the select parameters is a predetermined priority value representing the precedence in which fluid is delivered from the pump to the control valve of the work attachment. A controller receives the predetermined priority value of the work attachment and the demand signals. The controller responsively determines the sequence in which fluid is distributed from the pump to the respective control valves. Then the controller delivers control signals to the rerspective control valves in response to the determination, selectively positioning the stem of the respective control valves.
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Application No. 07/817,569, filed Jan. 7, 1992, Title: Hydraulic Control Apparatus, Attorney Docket No.: 91-318.
Devier Lonnie J.
Krone John J.
Lunzman Stephen V.
Marsden Howard A.
Caterpillar Inc.
Look Edward K.
Masterson David M.
Nguyen Hoang
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