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公开(公告)号：US20240287763A1
公开(公告)日：2024-08-29
申请号：US18690103
申请日：2023-03-31
IPC分类号： E02F9/22 , E02F9/26 , F15B11/028 , F15B11/044 , F15B19/00
CPC分类号： E02F9/2203 , E02F9/265 , F15B11/028 , F15B11/044 , F15B19/00 , E02F9/2296
摘要： A controller of a work machine computes a target velocity of a fluid pressure actuator according to an operation signal from an operation device, computes target thrust or target torque of the fluid pressure actuator on the basis of a driven state of the fluid pressure actuator, and controls a velocity of the fluid pressure actuator by a meter-out control valve on the basis of the operation signal from the operation device and controls at least one of a pump and a meter-in control valve such that a pressure on a meter-in side of the fluid pressure actuator is equal to or higher than a predetermined value when a positive or negative sign of the target velocity as a computation result is different from a positive or negative sign of the target thrust or the target torque as a computation result.
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公开(公告)号：US20240344297A1
公开(公告)日：2024-10-17
申请号：US18683384
申请日：2022-10-31
发明人： Kento KUMAGAI , Shinya IMURA , Yasutaka TSURUGA , Takaaki CHIBA , Shinjirou YAMAMOTO , Hiroaki AMANO , Shinji NISHIKAWA , Akihiro NARAZAKI
IPC分类号： E02F9/22
CPC分类号： E02F9/2235 , E02F9/2296
摘要： The present invention intends to provide a work machine that can execute speed control of an actuator and torque control of a swing motor by a simple configuration at the time of combined operation to simultaneously drive the swing motor and the other actuator. For this purpose, a controller calculates a pump target flow rate on the basis of an actuator target flow rate and a swing target flow rate and calculates a target meter-in opening area of an actuator directional control valve on the basis of the actuator target flow rate, a pump pressure, and an actuator meter-in pressure. The controller calculates target torque of the swing motor on the basis of the input amount of operation devices and output values of posture sensors and calculates a swing target meter-out pressure on the basis of the target torque and a swing meter-in pressure. The controller calculates a target meter-out opening area of a swing directional control valve on the basis of the swing target meter-out pressure and a swing meter-out pressure.
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公开(公告)号：US20220333348A1
公开(公告)日：2022-10-20
申请号：US17641038
申请日：2021-03-18
发明人： Kento KUMAGAI , Shinya IMURA , Yasutaka TSURUGA , Takaaki CHIBA , Hiroaki AMANO , Shinji NISHIKAWA , Akihiro NARAZAKI , Genroku SUGIYAMA , Shinjiro YAMAMOTO
摘要： Provided is a work machine which can increase the operation speed of an actuator by a regeneration function while securing the position control accuracy of the actuator. A controller is configured to calculate a regeneration flow rate on the basis of an input amount of an operation lever and a target actuator flow rate, subtract the regeneration flow rate from the target actuator flow rate to calculate a target actuator supply flow rate, calculate a target flow rate control valve opening amount on the basis of the target actuator supply flow rate, calculate a target pump flow rate that is equal to or higher than a total target actuator supply flow rate, control a selector valve on the basis of the input amount of the operation lever, control a flow rate control valve according to the target flow rate control valve opening amount, and control a hydraulic pump according to the target pump flow rate.
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公开(公告)号：US20210002868A1
公开(公告)日：2021-01-07
申请号：US16979338
申请日：2019-06-21
IPC分类号： E02F9/22
摘要： To provide a work machine that makes it possible to drive actuators faster and more accurately by supplying flows to the actuators accurately at target rates without depending on load variations in a case where the machine body is controlled automatically by command inputs of a controller, while high operability is ensured for manual operation by an operator. In a case where a machine control function is cancelled via a machine control switch, a controller cancels limitation of the flow rate of a hydraulic fluid supplied to a plurality of directional control valves, the limitation being performed by the auxiliary flow rate control devices, and in a case where the machine control function is selected via the machine control switch, the controller causes the auxiliary flow rate control devices to limit the flow rate of the hydraulic fluid supplied to the plurality of directional control valves.
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公开(公告)号：US20220333352A1
公开(公告)日：2022-10-20
申请号：US17640947
申请日：2020-11-02
发明人： Kento KUMAGAI , Shinya IMURA , Yasutaka TSURUGA , Takaaki CHIBA , Hiroaki AMANO , Shinji NISHIKAWA , Akihiro NARAZAKI , Genroku SUGIYAMA
摘要： Provided is a work machine which can achieve both of excellent operability when an operator manually operates a machine body or a work device and an accuracy of control of the machine body or the work device when a controller performs automatic control. The controller is configured to, in a case where the automatic control function selector switch gives an instruction to disable the automatic control function, adjust an opening amount of a bleed-off valve to a maximum opening amount or an opening amount corresponding to input amounts of control levers, and in a case where the automatic control function selector switch gives the instruction to enable the automatic control function, adjust the opening amount of the bleed-off valve, in at least part of an operation region of the control levers, so as to be smaller than the opening amount with the instruction to disable the automatic control function being given.
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公开(公告)号：US20220290406A1
公开(公告)日：2022-09-15
申请号：US17637533
申请日：2021-03-12
发明人： Kento KUMAGAI , Shinya IMURA , Yasutaka TSURUGA , Takaaki CHIBA , Hiroaki AMANO , Shinji NISHIKAWA , Akihiro NARAZAKI
IPC分类号： E02F9/22 , E02F9/26 , E02F9/20 , F15B13/044 , F15B13/02
摘要： A work machine that can keep the control accuracy of actuators irrespective of temperature variation of a hydraulic operating fluid that passes through flow rate controllers that control the flow rates of supply to the actuators is provided. For this purpose, the flow rate controllers each have a valve body that is disposed on a main hydraulic line connecting a delivery line of a hydraulic pump and the actuator and that moves according to an operation pressure from a solenoid proportional pressure reducing valve, a sampling hydraulic line that branches from the main hydraulic line, and a temperature sensor set on the sampling hydraulic line. The controller is configured to correct a command electrical signal to the solenoid proportional pressure reducing valve according to a signal from the temperature sensor.
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公开(公告)号：US20210254309A1
公开(公告)日：2021-08-19
申请号：US17252129
申请日：2019-03-28
发明人： Kento KUMAGAI , Shinya IMURA , Genroku SUGIYAMA , Katsuaki KODAKA , Yasutaka TSURUGA , Takaaki CHIBA
IPC分类号： E02F9/22
摘要： A work machine capable of driving each actuator more speedily and more accurately by ensuring high operability in a case of operator's manual operation, while accurately supplying a hydraulic fluid at a target flow rate to the actuator without depending on a load fluctuation in a case of automatic control over a machine body in response to a command input from a controller is provided.
The controller controls a plurality of auxiliary flow controllers in such a manner that supply flow rates to a plurality of directional control valves from hydraulic pumps fluctuate in response to load fluctuations of a plurality of hydraulic actuators in a case in which an instruction on invalidation of an area limiting control function is issued, and controls the plurality of auxiliary flow controllers in such a manner that the supply flow rates to the plurality of directional control valves from the hydraulic pumps do not fluctuate in response to the load fluctuations of the plurality of hydraulic actuators in a case in which an instruction on validation of the area limiting control function is issued.-
公开(公告)号：US20240352710A1
公开(公告)日：2024-10-24
申请号：US18685547
申请日：2022-10-31
发明人： Kento KUMAGAI , Shinya IMURA , Yasutaka TSURUGA , Takaaki CHIBA , Shinjirou YAMAMOTO , Hiroaki AMANO , Shinji NISHIKAWA , Akihiro NARAZAKI
IPC分类号： E02F9/22
CPC分类号： E02F9/2217 , E02F9/2225 , E02F9/2285
摘要： An object of the present invention is to provide a work machine that makes it possible to perform, with a simple configuration, speed control of respective actuators and thrust control of a particular actuator that regenerates the flow of a return fluid, at the time of combined operation to simultaneously drive the particular actuator and another actuator. For this purpose, a controller calculates a target thrust that is a target value of a thrust of the particular actuator on the basis of an input amount of an operation device and an output value of a posture sensor, calculates a target meter-out pressure that is a target value of a meter-out pressure of the particular actuator on the basis of the target thrust and a meter-in pressure of the particular actuator, and calculates a regeneration control valve target opening area that is a target value of an opening area of a regeneration control valve on the basis of the target meter-out pressure and the meter-out pressure of the particular actuator.
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公开(公告)号：US20230358022A1
公开(公告)日：2023-11-09
申请号：US18025707
申请日：2021-12-08
发明人： Kento KUMAGAI , Shinya IMURA , Yasutaka TSURUGA , Takaaki CHIBA , Hiroaki AMANO , Shinji NISHIKAWA , Akihiro NARAZAKI , Genroku SUGIYAMA , Shinjiro YAMAMOTO
IPC分类号： E02F9/22
CPC分类号： E02F9/2228
摘要： The invention of the present application intends to provide a work machine that can ensure high operability by preventing abrupt actuation of an actuator and a shock to a machine body by use of a bleed-off function at the time of starting of the actuator and that can improve the energy-saving performance by reducing a bleed-off flow rate after the starting of the actuator. For this purpose, a controller opens a bleed-off valve at a timing at which an operation device is being operated and before a flow rate of a hydraulic pump starts increasing, and closes the bleed-off valve at a timing at which the operation device is being operated and after the flow rate of the hydraulic pump has started increasing.
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公开(公告)号：US20220127823A1
公开(公告)日：2022-04-28
申请号：US17436174
申请日：2020-08-07
发明人： Takaaki CHIBA , Kento KUMAGAI , Yusuke IMAI
摘要： A hydraulic excavator 1 includes an engine 16, a main hydraulic pump 17 driven by the engine 16, a plurality of hydraulic actuators driven with pressure oil discharged from the main hydraulic pump 17, a plurality of flow rate control valves adapted to control the flow rate of pressure oil to be supplied from the main hydraulic pump 17 to the respective hydraulic actuators, a pilot hydraulic pump 18 adapted to supply pressure oil for driving the flow rate control valves, and a controller 15 configured to control the discharge flow rate of the pilot hydraulic pump 18. The controller 15 controls the discharge flow rate of the pilot hydraulic pump 18 such that it becomes equal to the sum of requested pilot flow rates determined in accordance with control commands for the respective flow rate control valves and a preset standby flow rate.
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