DRIVE SYSTEM FOR HYDRAULIC CLOSED CIRCUIT
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United States of America Patent
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Issued Date -
Sep 25, 2014
app pub date -
Dec 3, 2012
filing date -
Jan 11, 2012
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A drive system suppresses cylinder speed fluctuation at times of load inversion in a hydraulic closed circuit system in which a single rod cylinder is driven by a hydraulic pump. The drive system has a control device including: pressure detection means which detect pressure in a rod-side hydraulic chamber of the hydraulic cylinder and pressure in a head-side hydraulic chamber of the hydraulic cylinder; load calculation means which calculates the load on the hydraulic cylinder from the pressure in the rod-side hydraulic chamber and the pressure in the head-side hydraulic chamber; load switching means which calculates a first proportional gain in accordance with the polarity of the calculated load; and multiplication means which calculates a command signal by multiplying the calculated first proportional gain and an operation amount input from the operating device together and outputs the calculated command signal to the delivery flow rate control means.
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