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1. 发明授权

US12066042B2 Hydraulic system 有权
公开(公告)号：US12066042B2
公开(公告)日：2024-08-20
申请号：US18026208
申请日：2022-02-18
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： Jun Okamura
IPC分类号： F15B21/08 , F15B11/08
CPC分类号： F15B21/087 , F15B11/08 , F15B2211/3144 , F15B2211/327 , F15B2211/329 , F15B2211/355
摘要： An object of the invention of the present application is to provide a hydraulic system that is capable of causing a control pressure outputted from a solenoid valve to follow a control request value quickly at the time the solenoid valve starts to be driven. To achieve the object, in the hydraulic system including a solenoid valve that generates a control pressure for operating a control valve, an operation device that is operated to input a control request value as a request value for the control pressure, and a controller configured to set a control target value as a target value for the control pressure depending on the control request value and drive the solenoid valve with the control target value, the controller sets the control target value such that the control target value becomes a maximum output pressure in a usage range of the solenoid valve at the time of starting to drive the solenoid valve and becomes gradually closer to the control request value as time elapses after having reached the maximum output pressure.

2. 发明授权

US11719335B2 Work machine and control method 有权
公开(公告)号：US11719335B2
公开(公告)日：2023-08-08
申请号：US17432350
申请日：2020-04-02
申请人： KOMATSU LTD.
发明人： Akira Nakashima , Shinobu Kamikawa
IPC分类号： F16H61/4078 , F15B21/00 , F15B11/08 , F15B13/042 , F16H61/4139 , F16H61/4008 , F15B21/0423 , E02F9/22 , F15B11/16
CPC分类号： F16H61/4078 , E02F9/22 , F15B11/08 , F15B11/167 , F15B13/042 , F15B21/005 , F15B21/0423 , F16H61/4008 , F16H61/4139 , F15B2211/20546 , F15B2211/20576 , F15B2211/329 , F15B2211/355 , F15B2211/36 , F15B2211/613 , F15B2211/615 , F15B2211/62 , F15B2211/633 , F15B2211/6303 , F15B2211/6313 , F15B2211/6346 , F15B2211/67 , F15B2211/7058
摘要： An HST circuit has a hydraulic pump that converts a drive force of an engine into energy of oil, and a hydraulic motor that converts the energy of the oil converted by the hydraulic pump into drive energy. Pressure sensors detect a pressure of the oil within the HST circuit. A variable charge pump replenishes the oil into the HST circuit. A controller controls a capacity of the variable charge pump based on the pressure of the oil within the HST circuit detected by the pressure sensors.

3. 发明授权

US10641388B2 Hydraulic system of work machine and work machine 有权
公开(公告)号：US10641388B2
公开(公告)日：2020-05-05
申请号：US15369890
申请日：2016-12-06
申请人： Kubota Corporation
发明人： Yuji Fukuda , Kazuyoshi Arii , Ryohei Sumiyoshi
IPC分类号： F16H61/4157 , F16H61/433 , F16H61/4035 , F16H61/44 , F15B11/20 , E02F9/22 , F16H61/423 , B60K17/10
CPC分类号： F16H61/4035 , E02F9/2285 , F15B11/20 , F16H61/44 , B60K17/10 , F15B2211/20576 , F15B2211/3058 , F15B2211/30505 , F15B2211/30525 , F15B2211/329 , F15B2211/355 , F15B2211/613 , F15B2211/6355 , F15B2211/7058 , F15B2211/71 , F15B2211/782 , F16H61/4157 , F16H61/423 , F16H61/433
摘要： A hydraulic system of a work machine includes a first hydraulic device to operate in a first operation mode while pressure of hydraulic oil supplied from a hydraulic pump via a first oil passage is equal to or higher than a first pressure threshold. The hydraulic oil in the first oil passage is to be discharged via a second oil passage. A pilot check valve is provided in the second oil passage and has a pilot port to receive a pilot pressure of the hydraulic oil. The pilot check valve is closed to stop discharging the hydraulic oil in the first oil passage through the second oil passage while the pilot pressure is higher than or equal to the second pressure threshold. The pilot check valve is opened while the pilot pressure is less than the second pressure threshold.

4. 发明申请

US20190128290A1 METHOD FOR IMPROVING ELECTRO-HYDRAULIC SYSTEM RESPONSE 审中-公开
公开(公告)号：US20190128290A1
公开(公告)日：2019-05-02
申请号：US15798552
申请日：2017-10-31
申请人： Deere & Company
发明人： Grant R. Henn , Aaron R. Kenkel
IPC分类号： F15B13/044 , E02F9/22 , F15B13/04 , F15B13/042 , F16K31/06
CPC分类号： F15B13/044 , E02F9/2228 , F15B13/024 , F15B13/042 , F15B13/0433 , F15B2211/30525 , F15B2211/329 , F15B2211/355 , F15B2211/575 , F15B2211/6346 , F15B2211/6658 , F15B2211/67 , F15B2211/851 , F16K31/0613
摘要： A method for controlling a valve spool that includes providing a control valve having a first end and a second end with a spool disposed therebetween, a hydraulic component, a controller, a first control circuit and a second control circuit, selectively controlling the pressure in the first end and the second end with the controller, identifying an active state, with the controller, and applying an active pressure to both the first end and the second end with the corresponding first control circuit and second control circuit during the active state, and identifying a first command, with the controller, and providing a command pressure to the first end through the first control circuit and a release pressure to the second end through the second control circuit during the first command. Wherein, the spool is moved within the control valve and the hydraulic component is engaged during the first command.

5. 发明申请

US20180106018A1 Construction Machine 审中-公开
公开(公告)号：US20180106018A1
公开(公告)日：2018-04-19
申请号：US15555685
申请日：2016-03-11
申请人： HITACHI CONSTRUCTION MACHINERY CO., LTD.
发明人： Masatoshi HOSHINO , Yasutaka TSURUGA , Kiwamu TAKAHASHI , Seiji HIJIKATA
IPC分类号： E02F9/22 , F15B11/10
CPC分类号： E02F9/2235 , E02F3/32 , E02F9/2225 , E02F9/2246 , E02F9/2285 , E02F9/2292 , E02F9/2296 , F02D29/04 , F02D2200/101 , F02D2200/50 , F15B11/10 , F15B11/166 , F15B2211/20523 , F15B2211/20553 , F15B2211/30 , F15B2211/329 , F15B2211/355 , F15B2211/633 , F15B2211/6336 , F15B2211/6355 , F15B2211/6652 , F15B2211/7053 , F15B2211/851 , F16H61/475
摘要： The invention provides a construction machine in which the load torque at the time of engine start-up can be reduced even when the engine stops against the will of the operator. A hydraulic excavator includes a control device (35) having a pump displacement control section (37) and an unload control section (38). The pump displacement control section (37) makes the displacement of a hydraulic pump (16) variable to a minimum displacement by controlling a regulator device (20) when the speed of an engine (14) detected by a speed sensor (41) becomes equal to or less than a preset low speed N3 at the time of driving of the engine (14). The unload control section (40) controls an unloading valve (24) to the open position at the time of start-up of the engine (14).

6. 发明申请

US20170204886A1 METHODS AND APPARATUS TO ENABLE BOOM BOUNCE REDUCTION AND PREVENT UN-COMMANDED MOTION IN HYDRAULIC SYSTEMS 审中-公开
公开(公告)号：US20170204886A1
公开(公告)日：2017-07-20
申请号：US15326395
申请日：2015-07-15
申请人： EATON CORPORATION
发明人： Meng WANG , Michael Berne RANNOW
IPC分类号： F15B21/00 , F16K31/42 , F15B11/042 , F15B11/00 , F15B11/044
CPC分类号： F15B21/008 , B66C13/066 , E04G21/0454 , F15B11/003 , F15B11/042 , F15B11/0445 , F15B19/005 , F15B2211/30515 , F15B2211/3057 , F15B2211/329 , F15B2211/355 , F15B2211/50509 , F15B2211/5059 , F15B2211/526 , F15B2211/6313 , F15B2211/632 , F15B2211/634 , F15B2211/6658 , F15B2211/855 , F15B2211/8616 , F15B2211/8636 , F15B2211/8752 , F16K31/426
摘要： A hydraulic system (600) and method for reducing boom dynamics of a boom (30), while providing counter-balance valve protection, includes a hydraulic actuator (110), first and second counter-balance valves (300, 400), first and second independent control valves (700, 800), and first and second blocking valves (350, 450). The actuator includes first and second corresponding chambers. In a first mode, the second counter-balance valve is opened by the first control valve, and the first counter-balance valve is opened by the second control valve. In a second mode, at least one of the counter-balance valves is closed. A meter-out control valve (800, 700) may be operated in a flow control mode, and/or a meter-in control valve (700, 800) may be operated in a pressure control mode. Boom dynamics reduction may occur while the boom is in motion (e.g., about a worksite). By opening the counter-balance valves, sensors at the control valves may be used to characterize external loads. The control valves may respond to the external loads and at least partially cancel unwanted boom dynamics. The system may further detecting faults in actuators with counter-balance valves and prevent any single point fault from causing a boom falling event and/or mitigate such faults.

7. 发明申请

US20170107696A1 WORK MACHINE 审中-公开
公开(公告)号：US20170107696A1
公开(公告)日：2017-04-20
申请号：US15391750
申请日：2016-12-27
申请人： KUBOTA CORPORATION
发明人： Yuji FUKUDA , Ryosuke KINUGAWA , Hiroaki NAKAGAWA
IPC分类号： E02F9/22 , F15B13/043 , F15B19/00 , F15B11/08
CPC分类号： E02F9/2285 , E02F3/3414 , E02F9/2228 , E02F9/2253 , E02F9/226 , E02F9/2267 , E02F9/2292 , E02F9/2296 , F15B11/08 , F15B13/0433 , F15B19/00 , F15B21/045 , F15B2211/20523 , F15B2211/20553 , F15B2211/329 , F15B2211/355 , F15B2211/526 , F15B2211/633 , F15B2211/6343 , F15B2211/6355 , F15B2211/66 , F15B2211/665 , F15B2211/67 , F15B2211/857 , F16H61/433
摘要： A work machine includes an engine, a pilot pump to be driven by the engine to supply a pilot fluid, an operation pump to receive a first pilot fluid to change an output power in accordance with the first pilot fluid, a pilot fluid tube provided between the pilot pump and the operation pump, an operation valve connected to the pilot fluid tube to output the first pilot fluid, the first pilot fluid being a part of the pilot fluid supplied from the pilot fluid, a temperature sensor to measure a temperature of at least one of an operation fluid including the pilot fluid, a cooling water, an engine oil, and an outside air, and a pressure controller to control a first pilot pressure of the pilot fluid outputted from the operation valve when a temperature measured by the temperature sensor is equal to or higher than a first temperature.

8. 发明申请

US20170073924A1 Working machine having a hydraulically operated implement 审中-公开
标题翻译：工作机具有液压操作的工具
公开(公告)号：US20170073924A1
公开(公告)日：2017-03-16
申请号：US15123538
申请日：2015-03-02
申请人： CNH Industrial America LLC
发明人： Adriano Garramone , Andrea Gravili , Gianpiero Negri , Giuseppina Razetto , Marco Pietro Ciarrocchi
IPC分类号： E02F3/43 , F15B13/042 , E02F9/20 , E02F3/28 , E02F9/22
CPC分类号： E02F3/434 , E02F3/283 , E02F9/2004 , E02F9/2041 , E02F9/2203 , E02F9/2267 , E02F9/2285 , F15B13/0422 , F15B13/0424 , F15B2013/0428 , F15B2211/329 , F15B2211/355 , F15B2211/575 , F15B2211/6316 , F15B2211/6336 , F15B2211/6346 , F15B2211/6355 , F15B2211/67 , F15B2211/857
摘要： A working machine including a movable implement, a hydraulic actuator for displacing the implement, and a hydraulic control system for enabling an operator to control movement of the implement. The control system allows the implement to be returned to a desired position or state, such as a return to dig position or a return to float state, in a single automated operation that is initiated by the operator actuating a switch at the same time as moving a joystick in a desired direction. A pilot-operated valve is used to supply hydraulic fluid under pressure to the actuator acting on the implement and the operation of the joystick is detected by means of a pressure sensor connected to a control line of the pilot-operated valve.
摘要翻译：一种包括可移动工具的工作机，用于移动工具的液压致动器，以及用于使操作者能够控制工具的运动的液压控制系统。控制系统允许工具在由操作员在移动的同时启动开关的一个自动操作中返回到期望的位置或状态，例如返回到挖掘位置或返回到浮动状态操纵杆在所需的方向。先导阀用于向作用在工具上的致动器提供压力下的液压流体，并且通过连接到先导式操作阀的控制线的压力传感器来检测操纵杆的操作。

9. 发明授权

US09574328B2 Power regeneration device for working machine and working machine 有权
标题翻译：电动再生装置用于作业机和作业机
公开(公告)号：US09574328B2
公开(公告)日：2017-02-21
申请号：US14353677
申请日：2012-12-18
申请人： HITACHI CONSTRUCTION MACHINERY CO., LTD.
发明人： Seiji Hijikata
IPC分类号： F15B21/14 , E02F9/22 , E02F9/20 , F15B11/044 , F15B13/02 , F15B13/044
CPC分类号： E02F9/2217 , B66F9/22 , E02F9/2075 , E02F9/2091 , E02F9/2285 , E02F9/2296 , F15B11/044 , F15B13/022 , F15B13/0442 , F15B21/14 , F15B2211/20515 , F15B2211/353 , F15B2211/355 , F15B2211/611 , F15B2211/6316 , F15B2211/6326 , F15B2211/6346 , F15B2211/6355 , F15B2211/665 , F15B2211/6654 , F15B2211/7058 , F15B2211/7135 , F15B2211/761 , F15B2211/88
摘要： In a lowering operation of a boom, the amount of operation of a control lever is detected by a pressure sensor and input to a controller. Based on the input operation amount, the controller obtains a target flow rate Q0 of return oil discharged from a boom cylinder, calculates a deviation ΔQ between the target flow rate Q0 and an actual flow rate Q obtained from an actual rotation speed N of an electric motor acquired by a rotation speed sensor, calculates a signal Sm for controlling the opening area of a proportional solenoid valve in a manner allowing hydraulic fluid to flow to a control valve in just as much as ΔQ, and controls an operation pilot pressure of the control valve supplied from a sub-pump in accordance with the signal Sm so that the hydraulic fluid will flow to the control valve exactly in the amount of ΔQ.
摘要翻译：在起重臂的降低操作中，控制杆的操作量由压力传感器检测并输入到控制器。基于输入操作量，控制器获得从动臂缸排出的返回油的目标流量Q0，计算目标流量Q0与从电动执行器的实际转速N获得的实际流量Q之间的偏差ΔQ 通过旋转速度传感器获取的电动机以与ΔQ一样多的方式计算用于控制比例电磁阀的开口面积的信号Sm，并且控制控制器的操作先导压力阀根据信号Sm从副泵提供，使得液压流体将精确地以ΔQ的量流到控制阀。

10. 发明申请

US20170023149A1 HYDRAULIC SIGNAL CONTROL SYSTEM AND METHOD 审中-公开
标题翻译：液压信号控制系统及方法
公开(公告)号：US20170023149A1
公开(公告)日：2017-01-26
申请号：US14806406
申请日：2015-07-22
申请人： CNH Industrial America LLC
发明人： Thomas Edward Johnson
IPC分类号： F16K31/42 , A01B76/00 , E02F9/22
CPC分类号： F16K31/423 , A01B76/00 , E02F9/2278 , E02F9/2285 , F15B11/003 , F15B19/002 , F15B2211/30515 , F15B2211/30525 , F15B2211/329 , F15B2211/355 , F15B2211/7053 , F15B2211/71 , F15B2211/783
摘要： In an embodiment, a tangible, non-transitory computer-readable media stores computer instructions executable by a processor and configured to increase a first signal pressure to a first actuating element of a directional control valve until the directional control valve is about to shift positions. The first signal pressure is greater than a second signal pressure to a second actuating element of the directional control valve by a signal pressure differential. The computer instructions are also configured to increase the first and second signal pressures equally while maintaining the signal pressure differential to cause a first pilot stage check valve and a second pilot stage check valve to shift positions, and, within a threshold time thereafter, increase the first signal pressure while maintaining the second signal pressure to increase the signal pressure differential to a value sufficient to cause the directional control valve to shift positions.
摘要翻译：在一个实施例中，有形的，非暂时的计算机可读介质存储可由处理器执行的计算机指令，并且被配置为将第一信号压力增加到方向控制阀的第一致动元件，直到方向控制阀即将移动位置。第一信号压力大于通过信号压差与方向控制阀的第二致动元件的第二信号压力。计算机指令还被配置为在保持信号压差以使第一先导级止回阀和第二先导级止回阀移动位置的同时增加第一和第二信号压力，并且在其后的阈值时间内增加第一信号压力同时保持第二信号压力，以将信号压差增加到足以使方向控制阀移位的值。

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