Power plants – Pressure fluid source and motor – Methods of operation
Patent
1997-09-15
1998-09-29
Nguyen, Hoang
Power plants
Pressure fluid source and motor
Methods of operation
91361, 91454, F16D 3100
Patent
active
058132260
ABSTRACT:
A control scheme is provided that controls the maximum pressure level in desired locations of a hydraulic system. This control scheme eliminates the need of separate line relief valves that many times create pressure spikes in the hydraulic system. In one example, the control scheme functions to sense the operating pressure at the desired location and compares it to a differential pressure and a desired input command during one step or loop to establish a predicted pressure level. The predicted pressure level is compared to the pressure necessary to initiate movement of the valving element in an electrically actuated control valve mechanism. The result is used to move the valving element to a predetermined position if the predicted pressure level is less than cracking pressure level and the differential pressure is greater than zero. If the predicted pressure level is higher than the cracking pressure level, an output control signal is boosted in order to move the valving element to an open position in a much quicker time period to offset the over pressure condition before a pressure spike occurs.
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Krone John J.
Qian Yaoxin
Burrows J. W.
Caterpillar Inc.
Nguyen Hoang
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