Power plants – Pressure fluid source and motor – Condition responsive control of or by input to input pump...
Patent
1992-01-13
1993-06-01
Look, Edward K.
Power plants
Pressure fluid source and motor
Condition responsive control of or by input to input pump...
60433, F16D 3102
Patent
active
052149161
ABSTRACT:
An apparatus controls an electrohydraulic system of a work vehicle. The work vehicle has a engine, at least one fluid circuit having a variable displacement pump driven by the engine, and a plurality of control valves for controllably passing fluid from the variable displacement pump to a plurality of respective work elements. A device produces a signal indicative of a desired velocity of a respective work element. A device senses a load on a work element and producing a signal representative of the actual load in response to the sensed load. A control device receives the desired velocity signal and load signals, and responsively calculates a desired power level for the electrohydraulic system. Responsively, the control device produces an engine speed command signal indicative of an optimum engine speed in response to the desired power level.
REFERENCES:
patent: 3821625 (1974-06-01), Scholl
patent: 4523892 (1985-06-01), Mitchell et al.
patent: 4534707 (1985-08-01), Mitchell
patent: 4712376 (1987-12-01), Handank
patent: 4718329 (1988-01-01), Nakajima et al.
Application No. 07/817,569 filed Jan. 7, 1992 Title: Hydraulic Control Apparatus Attorney Docket No.: 91-318.
Caterpillar Inc.
Look Edward K.
Lopez F. Daniel
Masterson David M.
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