Device and method of controlling hydraulic drive of...

Details Device and method of controlling hydraulic drive of... Device and method of controlling hydraulic drive of...

2004-12-08

2009-10-27

Leslie, Michael (Department: 3745)

Power plants

Pressure fluid source and motor

Condition responsive control of or by input to input pump...

Reexamination Certificate

active

07607296

ABSTRACT:
In construction machinery, control is conducted to keep a work machine to operate at a constant speed regardless of the operation thereof. Different engine output lines T0-T3and pump torque lines M1-M4are defined for different operation types. All the matching points of the engine output lines T0-T3and pump torque lines M1-M4designate a constant engine speed N1. One engine output line and one pump torque line are selected according to the operation type presently selected. An output horsepower of the engine is controlled on an equal horsepower line corresponding to a sum of a horsepower for an auxiliary machine and a horsepower at a matching point of the selected lines. The pump torque for the work machine is controlled on the selected pump torque line. The engine operates at a constant speed N1even when the operation type varies or the horsepower for the auxiliary machine changes.

REFERENCES:
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Japanese Office Action dated Feb. 26, 2008, issued in corresponding Japanese Patent Application No. 2005-516151.
International Search Report mailed Apr. 26, 2005 of International Application PCT/JP2004/018313.

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