Pumps – Condition responsive control of pump drive motor – Single motor control element responsive to means sensing...
Patent
1997-07-01
1999-10-19
Freay, Charles G.
Pumps
Condition responsive control of pump drive motor
Single motor control element responsive to means sensing...
417 34, F04B 4900
Patent
active
059677562
ABSTRACT:
An apparatus for controlling an electrohydraulic system of a work machine having an engine that drives a variable displacement pump is disclosed. A pump displacement setting device produces a pump command signal indicative of a desired displacement of the variable displacement pump. An engine speed setting device produces an engine command signal indicative of a desired rotational speed of the engine. A power manager receives the pump and engine command signals, determines an efficient engine speed and pump displacement, and produces an engine control signal that decreases the engine speed to the efficient engine speed and a pump control signal that increases the pump displacement to an efficient pump displacement, while maintaining a substantially constant pump flow rate.
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Devier Lonnie J.
Lunzman Stephen V.
Caterpillar Inc.
Evora Robert Z.
Freay Charles G.
Kercher Kevin M.
Masterson David M.
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