SPEED CONTROL DEVICE FOR HYDRAULIC ACTUATOR
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United States of America Patent
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Issued Date -
May 13, 2010
app pub date -
Apr 16, 2008
filing date -
Apr 18, 2007
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A working oil supply flow rate to hydraulic actuators (7-9) is controlled on the basis of target operating speeds (C7-C9). When a state in which one of the hydraulic actuators (7-9) has substantially stopped operating is detected, the target operating speed (C7-C9) of that hydraulic actuator is reset at a smaller value. A required flow rate Qb required of the hydraulic pump 22 is calculated using the reset target operating speed, whereupon the target operating speeds are corrected using a flow distribution factor Qr obtained by dividing a possible supply flow rate Qa by the required flow rate Qb. By controlling the working oil supply flow rate to the hydraulic actuators (7-9) on the basis of the corrected target operating speeds, when one of the hydraulic actuators (7-9) substantially stops operating, the supply of working oil to the other hydraulic actuators can be increased quickly.
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