SWING MOTOR CONTROL METHOD IN OPEN CENTER TYPE HYDRAULIC SYSTEM FOR EXCAVATOR
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United States of America Patent
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Issued Date -
Jun 30, 2011
app pub date -
Dec 30, 2010
filing date -
Dec 30, 2009
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A swing motor control method in an open center type hydraulic system for a hydraulic excavator is provided, which can adjust the speed of a swing motor so that a swing device and a working device harmonize with each other according to a discharge pressure of a hydraulic pump during a multifunctional work of the working device and the swing device. The swing motor control method in an open center type hydraulic system for an excavator including first and second hydraulic pumps, a swing motor, a working device actuator including a boom or arm actuator, a working device control valve controlling a start, a stop, and a direction change of the working device actuator, a discharge pressure sensor sensing the discharge pressure of the second hydraulic pump, and a swing motor controller controlling a speed of the swing motor in accordance with the pressure detected by the discharge pressure sensor, includes controlling the speed of the swing motor during a multifunctional operation of the swing device and the working device, comparing the pressure detected by the hydraulic pump discharge pressure sensor with a preset pump discharge pressure, and controlling a limiting speed of the swing motor in accordance with the result of comparison.
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