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公开(公告)号：EP4170187A1
公开(公告)日：2023-04-26
申请号：EP21825891.1
申请日：2021-04-27
IPC分类号： F15B11/024 , E02F9/22 , F15B11/028 , F15B11/044
摘要： This hydraulic drive system includes: a hydraulic pump that supplies a working fluid to a hydraulic actuator; a meter-in control valve that controls a flow rate of the working fluid flowing from the hydraulic pump to the hydraulic actuator; a meter-out control valve that controls a flow rate of the working fluid being drained from the hydraulic actuator into a tank; and a regeneration valve that supplies, to the hydraulic actuator, the working fluid drained from the hydraulic actuator. The meter-out control valve is connected to the hydraulic actuator in parallel with the regeneration valve.
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公开(公告)号：EP4212739A1
公开(公告)日：2023-07-19
申请号：EP21866826.7
申请日：2021-09-09
IPC分类号： F15B11/05 , F15B11/02 , F15B11/042 , F15B11/044
摘要： This hydraulic drive system includes: a first circuit system; a first hydraulic pump; a second circuit system; a second hydraulic pump; a merge valve that opens and closes a merge passage connecting the first hydraulic pump and the second hydraulic pump; an operation device that outputs an operation command corresponding to an amount of operation specifying an amount of actuation of each of a first hydraulic actuator and a second hydraulic actuator; and a control device that controls an operation of the merge valve according to the operation command from the operation device. The first circuit system includes: a first meter-in control valve that controls a meter-in flow rate of the working fluid that flows to the first hydraulic actuator; and a first meter-out control valve that controls a meter-out flow rate of the working fluid that is drained from the first hydraulic actuator into a tank. The control device controls an opening degree of the first meter-in control valve and an opening degree of the first meter-out control valve.
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公开(公告)号：EP4184015A1
公开(公告)日：2023-05-24
申请号：EP21841588.3
申请日：2021-06-29
IPC分类号： F15B11/044 , E02F9/22 , F15B11/02 , F15B11/028 , F15B11/042
摘要： This hydraulic drive system includes: a hydraulic pump capable of changing a discharge flow rate of a working fluid; a meter-in control valve that controls a meter-in flow rate of the working fluid flowing from the hydraulic pump to a hydraulic actuator; a meter-out control valve that is provided separately from the meter-in control valve and controls a meter-out flow rate of the working fluid being drained from the hydraulic actuator into a tank; an operation device that outputs an operation command; a first pressure sensor that detects a drainage pressure of the hydraulic actuator; and a control device that sets a target meter-out flow rate according to the operation command from the operation device and controls an opening degree of the meter-out control valve on the basis of the drainage pressure detected by the first pressure sensor and the target meter-out flow rate.
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