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[CN 201980095034.4] Hydraulic Machinery Title: Hydraulic Machinery Application Number: CN 201980095034.4 Applicant: Volvo Construction Equipment Company Application Date: 2019-4-5 Patent Type: Invention Application for a Hydraulic Machinery, Including: Storage Tank (101); Working device, which includes boom; Boom cylinder, which operates boom and has large chamber (313a) and small chamber (313b); Floating hydraulic circuit, it is connected to the large chamber (313a), the small chamber (313b) and the tank (101) to perform a floating function enabling the large chamber (313a), the small chamber (313b) and the tank (101) to communicate with each other, and an operator input device for receiving a request from the driver to open or close the floating hydraulic circuit. In the case of a boom lowering operation for lowering the boom, it is determined whether the working device is floating in the air, and when it is determined that the working device is floating in the air, even if a request to open the floating hydraulic circuit is input to the operator input device, the floating hydraulic circuit may be closed. In some embodiments, when the value of (the pressure of the large chamber (313a)-the pressure of the small chamber (313b)/(the effective area to which the pressure of the large chamber (313a) is applied/the effective area to which the pressure of the small chamber (313b) is applied) is greater than a preset value, it may be determined that the working device is floating in the air. In some alternative embodiments, when the value of the pressure of the large chamber (313a) is greater than a preset value, it may be determined that the working device is floating in the air.
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