Hydraulic closed circuit system
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United States of America Patent
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Jun 20, 2017
Grant Date -
Dec 18, 2014
app pub date -
Jan 28, 2013
filing date -
Jan 31, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
A hydraulic closed circuit system using a single rod type hydraulic cylinder prevents the hunting of a flushing valve due to a delay in response of the flushing valve and circuit pressure pulsations, thereby preventing a decrease in operability of the hydraulic cylinder. A single rod type hydraulic cylinder is connected to a hydraulic pump via two hydraulic lines. A flushing valve is connected between the hydraulic lines and a tank; and a control unit is configured to add a predetermined control parameter to a pressure in a lower-pressure hydraulic line of the two hydraulic lines. The magnitude of a pressure in the higher-pressure hydraulic line of the two hydraulic lines is compared with the magnitude of a compensation pressure to which the control parameter has been added, and the flushing valve is switched when the compensation pressure and the higher-pressure hydraulic line pressure are found to be reversed in magnitude.
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