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公开(公告)号：US20200378089A1
公开(公告)日：2020-12-03
申请号：US16641718
申请日：2018-09-28
发明人： Koji HYODO , Yuki AHIKO , Tetsuji TANAKA , Isamu AOKI , Masaki NUKII , Masashi YAMASHITA
摘要： Provide is a loading vehicle capable of quickly operating an object handling device in the upward direction while traveling forward.A wheel loader 1 comprises an engine 3, an HST pump 41, an HST motor 42, a forward/reverse changeover switch 62, a step-on amount sensor 610, a pressure sensor 73, and a controller 5. In a case where a specific condition for specifying lifting operation of a lift arm 21 during forward traveling of the vehicle body is satisfied, the controller 5 increases maximum rotational speed of the engine to a predetermined value Nmax2 which is greater than maximum engine rotational speed Nmax1 during traveling on the flat ground, and limit maximum vehicle speed to a predetermined value Vmax2 which is smaller than maximum vehicle speed Vmax1 prior to the lifting operation of the lift arm 2.
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公开(公告)号：US10801532B2
公开(公告)日：2020-10-13
申请号：US16327928
申请日：2017-03-29
IPC分类号： F15B21/14 , E02F9/22 , E02F9/20 , E02F3/42 , E02F3/43 , F15B11/10 , F15B1/02 , E02F3/32 , F15B21/047 , F15B21/044 , F15B21/08 , F15B1/033
摘要： A work machine including: a hydraulic cylinder 20 configured to drive a work implement 3; a control valve 22 configured to connect a delivery line of a hydraulic pump 21 switchingly to a bottom fluid chamber and a rod fluid chamber of the hydraulic cylinder 20 and a tank; a pilot pump 23 configured to output a pilot pressure to drive the control valve 22; an engine 24 configured to drive the hydraulic pump 21 and the pilot pump 23; and an accumulator 26 configured to accumulate a return hydraulic fluid from the hydraulic cylinder 20 is provided with: a bypass line 41 configured to connect the bottom fluid chamber of the hydraulic cylinder 20 and a delivery line 21a of the hydraulic pump 21 by bypassing the control valve 22 and be provided with the accumulator 26 thereon; a pressure-accumulation control valve 27 provided between the bottom fluid chamber of the hydraulic cylinder 20 and the accumulator 26; a release control valve 28 provided between the accumulator 26 and the delivery line 21a; and a hydraulic system controller 30 configured to open the release control valve 28 if an engine revolution speed N becomes lower than a set value Ns.
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公开(公告)号：USD890200S1
公开(公告)日：2020-07-14
申请号：US29665431
申请日：2018-10-03
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公开(公告)号：US10712451B2
公开(公告)日：2020-07-14
申请号：US15770363
申请日：2016-09-07
发明人： Yukihiko Ono , Hidefumi Ishimoto , Wataru Tanaka
IPC分类号： G01S19/48 , G01S19/22 , G01S19/50 , G05D1/02 , G01S17/42 , G01S17/875 , G01S17/89 , G01S17/87 , G01S7/497 , G01S17/931 , G01S19/49
摘要： A first measuring device measures a location of its own vehicle relative to each feature point on a surrounding structure around a road surface on which the vehicle. A first feature-point is provided which, based on output from the first measuring device, acquires coordinates of the each feature point expressed in a coordinate system of the first measuring device, and uses a self-location to convert the coordinates into an external coordinate. A feature-point trajectory generation section is provided to generate, based on the first coordinates, a trajectory of the feature point group. A second measuring device measures a location of its own vehicle relative to a feature point located rearward of the feature point measured by the first measuring device. An anomaly determination section is provided to determine that anomaly occurs in a self-location estimation device if the second coordinates are on the trajectory.
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公开(公告)号：US10683632B2
公开(公告)日：2020-06-16
申请号：US16094751
申请日：2016-09-28
发明人： Atsushi Nakamura , Koji Shimazaki
摘要： A work vehicle includes: a main hydraulic pump that supplies pressure oil to a hydraulic cylinder; an accessory pump that supplies pressure oil to an auxiliary machine; and a confluence switching valve that merges pressure oil of the accessory pump with pressure oil of the main hydraulic pump. The work vehicle is provided with a control device that, in case atmospheric pressure or air density of outside air is lower than a predetermined value, executes confluence limitation control of reducing a confluence flow rate at the confluence switching valve compared to the time in case the atmospheric pressure or the air density of the outside air is higher than the predetermined value, and canceling the confluence limitation control in case rotation speed of an engine becomes higher compared to a predetermined rotation speed value during the confluence limitation control, and the rotation speed value is higher as the atmospheric pressure or the air density of the outside air is lower.
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公开(公告)号：US10677268B2
公开(公告)日：2020-06-09
申请号：US16329032
申请日：2018-02-20
发明人： Daiki Itou , Akihiro Narazaki , Katsuaki Kodaka
摘要： In a construction machine with a hydraulic pilot type hydraulic control device, occurrence of jerking is prevented. A hydraulic excavator 1 having hydraulic pumps 51L and 51R, travel motors 22L and 22R, traveling operating levers 34L and 34R, a pilot pump 54, hydraulic pilot valves 55La, 55Lb, 55Ra, and 55Rb, and directional control valves 53L and 53R includes: changeover switches 35L and 35R which change the operating mode of the traveling operating levers 34L and 34R; pilot pressure adjusting devices 5L and 5R which adjust the pilot pressure applied to the directional control valves 53L and 53R; and pilot pressure sensors 56La, 56Lb, 56Ra, and 56Rb. The pilot pressure adjusting devices apply the pilot pressure at the time when the operating mode of the traveling operating levers 34L and 34R is changed to a control mode, to the directional control valves 53L and 53R.
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公开(公告)号：US10662618B2
公开(公告)日：2020-05-26
申请号：US16328902
申请日：2018-02-21
摘要： To prevent increase/decrease in pump flow rate due to load variation with change in the posture of a work attachment and improve the operability in arm pushing operation. A hydraulic excavator 1 with a front mechanism including an arm 33 driven by a hydraulic actuator 43 through operation of an operating lever 50 includes: first and second angle sensors 37 and 38 which detect the posture of the arm 33; and a controller 49 which, when the posture of the arm 33 is at a remoter side from an upperstructure 20 than a preset position and the position of a bucket 35 is adjusted from a maximum or nearly maximum preset operation amount of the operating lever 50 in arm pushing operation by the operating lever 50, changes the flow rate characteristic of pressure oil in relation to discharge pressure of a hydraulic pump 41 for supplying pressure oil to the hydraulic actuator 43, to characteristic PTS with a higher flow rate than flow rate characteristic PT at the time of operation with an operation amount other than the above operation amount, to drive the hydraulic pump 41.
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公开(公告)号：US10563378B2
公开(公告)日：2020-02-18
申请号：US15554536
申请日：2015-09-25
发明人： Hidekazu Moriki , Shinya Imura , Shiho Izumi , Hiroaki Amano , Kouji Ishikawa
IPC分类号： E02F9/22
摘要： A hydraulic system for a work machine includes a first hydraulic pump driving a swing hydraulic motor; a second hydraulic pumps driving a boom cylinder; a first pump displacement increase valve controlling a volume of the first hydraulic pump; a swing pilot pressure sensor detecting a swing operation amount; a boom raising pilot pressure sensor detecting a boom raising operation amount; and a controller controlling a control signal to the first pump displacement increase valve on the basis of the swing operation amount and the boom raising operation amount. The controller controls the control signal in such a manner that a delivery rate of the first hydraulic pump becomes higher as the swing operation amount is larger and an increasing rate of the delivery rate of the first hydraulic pump becomes lower as the boom raising operation amount is larger during a swing boom raising operation.
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公开(公告)号：US10557251B2
公开(公告)日：2020-02-11
申请号：US15554316
申请日：2016-03-10
发明人： Shinya Imura , Shinji Nishikawa , Manabu Edamura , Kouji Ishikawa , Masatoshi Hoshino , Shinji Ishihara
摘要： The first engine speed or a work machine is higher than the minimum engine speed, and the second engine speed is higher than the first engine speed and lower than the maximum engine speed. The ratio of the change in the target engine speed to the change in the operation amount of the engine speed instructing device when the operation amount of the engine speed instructing device is changed from the operation amount for instructing the minimum speed to the operation amount for instructing the first engine speed is larger than the ratio of the change in the target engine speed to the change in the operation amount of the engine speed instructing device when the operation amount of the engine speed instructing device is changed from the operation amount for instructing the second engine speed to the operation amount for instructing the maximum speed.
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公开(公告)号：US10538236B2
公开(公告)日：2020-01-21
申请号：US15526560
申请日：2015-03-13
发明人： Shinji Ishihara , Masatoshi Hoshino
IPC分类号： B60W20/16 , B60W10/30 , F01N9/00 , F01N3/027 , B60W10/26 , B60W10/08 , E02F9/20 , F01N3/023 , B60W10/06 , B60W30/188 , B60K6/48
摘要： A control apparatus for a hybrid construction machine includes an engine, a motor generator driven by the engine and capable of generating electric power, a hydraulic pump driven by total torque of the engine and the motor generator, a power storage device, an inverter, a filter that collects a particulate material in exhaust gas of the engine, and a control section outputting a command signal for controlling powering operation or regeneration operation of the motor generator. The control apparatus further includes a powering operation limitation section that inputs thereto an ordinary torque command calculated by a torque command value calculation section and a demand signal for regeneration of the filter decided by a filter regeneration decision section and calculates the command signal in response to the input signals. When a filter regeneration demand signal is available, a command signal for limiting the powering operation of the motor generator is calculated.
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