公开(公告)号：US20240360648A1

公开(公告)日：2024-10-31

申请号：US18687451

申请日：2023-03-22

申请人： Hitachi Construction Machinery Co., Ltd.

发明人： Yoshiaki TSUTSUMI ,  Shinya IMURA ,  Hidekazu MORIKI ,  Kazuya SEKINE

IPC分类号： E02F9/20 ,  E02F3/16 ,  E02F3/43 ,  E02F9/22

CPC分类号： E02F9/2083 ,  E02F3/16 ,  E02F3/434 ,  E02F9/2253 ,  E02F9/226

摘要： Provided is a control device for a wheel loader that is capable of improving the productivity of excavation work by reducing the work time required for the excavation work. A control device 120 is a control device for a wheel loader 1 that excavates a target by moving a vehicle body 2 forward with rotation of wheels 5f, 5r to plunge a bucket 3 into the target. The control device 120 moves the vehicle body 2 forward with the bucket 3 plunged into the target, and brakes the wheels 5f, 5r when a rotational speed of the wheels 5f, 5r exceeds a predetermined threshold BS.

公开(公告)号：US20240336301A1

公开(公告)日：2024-10-10

申请号：US18748978

申请日：2024-06-20

申请人： KUBOTA CORPORATION

发明人： Yuji FUKUDA ,  Kohei NAGAO

IPC分类号： B62D11/04 ,  E02F3/34 ,  E02F9/20 ,  E02F9/22 ,  F15B15/02 ,  F16H61/47

CPC分类号： B62D11/04 ,  E02F3/3414 ,  E02F9/2004 ,  E02F9/2235 ,  E02F9/2253 ,  E02F9/2292 ,  E02F9/2296 ,  F15B15/02 ,  F16H61/47

摘要： A working machine includes a first rotation detector to detect a first rotation speed of the left traveling motor, a second rotation detector to detect a second rotation speed of the right traveling motor, and a controller to perform automatic deceleration to automatically reduce the first rotation speed and the second rotation speed both set at respective second speed stages by shifting a speed stage of each of the first rotation speed and the second rotation speed to a first speed stage that is lower than the second speed stage. During straight traveling of a machine body of the working machine, the controller determines a straight-traveling threshold serving as a deceleration threshold for judging whether to perform the automatic deceleration based on the first rotation speed or the second rotation speed.

公开(公告)号：US12098524B2

公开(公告)日：2024-09-24

申请号：US18374772

申请日：2023-09-29

申请人： KUBOTA CORPORATION

发明人： Yuji Fukuda ,  Kohei Nagao ,  Hiroaki Nakagawa ,  Ryota Hamamoto

IPC分类号： E02F9/22 ,  F15B21/0427 ,  F16H61/02 ,  F16H61/4157 ,  F16H61/421 ,  F16H61/444 ,  F16H61/448

CPC分类号： E02F9/2246 ,  E02F9/2253 ,  E02F9/226 ,  E02F9/2285 ,  E02F9/2289 ,  E02F9/2292 ,  E02F9/2296 ,  F15B21/0427 ,  F16H61/0206 ,  F16H61/4157 ,  F16H61/421 ,  F16H61/444 ,  F16H61/448

摘要： A working machine includes a prime mover, a traveling device, a traveling motor, a traveling pump, a circulation fluid passage, a traveling switching valve shiftable between a first state corresponding to a first speed of a hydraulic motor and a second state corresponding to a second speed of the hydraulic motor, a brake, an actuation valve configured to output the hydraulic pressure applied to the traveling pump, and change the hydraulic pressure output therefrom, and a controller configured or programmed to control the traveling switching valve, the brake and the actuation valve, and being capable of activating a first mode. The controller is configured or programmed to, when activating the first mode, shift the brake into a braking state, shift the traveling switching valve into the second state, and control the actuation valve so as to set the hydraulic pressure output from the actuation valve to a predetermined pressure.

公开(公告)号：US20240309611A1

公开(公告)日：2024-09-19

申请号：US18603552

申请日：2024-03-13

申请人： CNH Industrial Italia S.p.A.

发明人： SANTOLO ANTONIO CASILLO ,  ADRIANO GARRAMONE ,  ANTONIO VENEZIA ,  STEFANO LIBERTI ,  ANDREA GRAVILI

IPC分类号： E02F9/22 ,  B60K23/00 ,  B60K26/00 ,  B60K31/02

CPC分类号： E02F9/2253 ,  B60K23/00 ,  B60K26/00 ,  B60K31/02 ,  E02F9/2246 ,  E02F9/2296

摘要： A method of controlling a propulsion system of a work or agricultural vehicle, wherein the propulsion system includes a prime mover and a hydraulic transmission including a variable displacement pump configured to be driven in rotation by the prime mover and a variable displacement hydraulic motor, operatively connected to the pump by means of a forward hydraulic line and a return one, the method providing for an ECO operating mode in which the accelerator controls the displacement of the hydraulic pump while the engine is operated at a fixed speed and in which, in said ECO operating mode, there is a step for acquiring a current speed of the vehicle (Step 1) and a limiting step (Step 3) of said displacement of the hydraulic pump when said current speed is lower than a predetermined speed threshold.

公开(公告)号：US12043986B2

公开(公告)日：2024-07-23

申请号：US17797545

申请日：2021-03-08

申请人： KOMATSU LTD.

发明人： Yuichi Nakano

IPC分类号： G06F7/70 ,  B60K31/00 ,  E02F9/22 ,  F16H61/42 ,  F16H59/44 ,  F16H59/66

CPC分类号： E02F9/2253 ,  B60K31/00 ,  F16H61/42 ,  B60K2031/0091 ,  F16H59/44 ,  F16H2059/663

摘要： When an inclination angle is greater than or equal to a first threshold, a controller determines a displacement of a hydraulic pump from a command vehicle speed based on second pump data and determines a displacement of a hydraulic motor from the command vehicle speed based on second motor data. The second pump data defines the displacement of the hydraulic pump that is smaller than that of first pump data with respect to the command vehicle speed. The second motor data defines the displacement of the hydraulic motor that is smaller than that of first motor data with respect to the command vehicle speed.

公开(公告)号：US12031299B2

公开(公告)日：2024-07-09

申请号：US17638391

申请日：2021-03-08

申请人： HITACHI CONSTRUCTION MACHINERY CO., LTD.

发明人： Koji Hyodo ,  Yasunori Miyamoto ,  Masaki Nukii

IPC分类号： F16H59/44 ,  E02F9/22 ,  F16H59/26 ,  F16H61/425 ,  F16H61/47

CPC分类号： E02F9/2253 ,  F16H59/26 ,  F16H59/44 ,  F16H61/425 ,  F16H61/47

摘要： Provided is a work vehicle capable of attaining a maximum vehicle speed specification value set in advance for each vehicle body even in the case where a device constituting an HST traveling drive system has deteriorated over time. In a wheel loader 1 equipped with an HST traveling drive system, a controller 5 is configured to, in the case where a detection pressure value P is equal to or less than a switching pressure value Ps corresponding to a switching point in the HST motor 42 between a maximum displacement volume qmax and a minimum displacement volume qmin, and a detection vehicle speed value V is less than an upper limit vehicle speed specification value Vmaxs, limit the minimum displacement volume qmin of the HST motor 42 to a first minimum displacement volume value qmin1 less than a minimum displacement volume specification value qmins that is associated with the upper limit vehicle speed specification value Vmaxs.

公开(公告)号：US11952749B2

公开(公告)日：2024-04-09

申请号：US17289423

申请日：2019-11-07

申请人： KOMATSU LTD.

发明人： Kenichi Yamada ,  Shogo Miyazaki ,  Akira Takeno ,  Shota Yamawaki

IPC分类号： E02F9/22 ,  E02F9/20 ,  F04D13/02 ,  F04D15/00 ,  F15B15/18 ,  F16H61/4008 ,  F16H61/4157 ,  F16H61/472

CPC分类号： E02F9/2253 ,  E02F9/2004 ,  E02F9/2292 ,  E02F9/2296 ,  F04D13/028 ,  F04D15/00 ,  F15B15/18 ,  F16H61/4008 ,  F16H61/4157 ,  F16H61/472

摘要： A control device for a power machine includes a target circuit pressure specifying unit configured to specify a target circuit pressure of the hydrostatic continuously variable transmission, a measurement value acquisition unit configured to acquire an actual circuit pressure of the hydrostatic continuously variable transmission, a brake torque determination unit configured to determine a brake torque based on the target circuit pressure and the actual circuit pressure, and a pump control unit configured to control the hydraulic pump based on the brake torque. The brake torque is a torque consumed by the hydraulic pump.

公开(公告)号：US11905683B2

公开(公告)日：2024-02-20

申请号：US17551687

申请日：2021-12-15

申请人： KUBOTA CORPORATION

发明人： Yuji Fukuda ,  Ryosuke Kinugawa ,  Ryota Hamamoto ,  Jun Tomita

IPC分类号： E02F9/22 ,  F16H61/47

CPC分类号： E02F9/2253 ,  E02F9/2232 ,  E02F9/2246 ,  E02F9/2267 ,  E02F9/2289 ,  E02F9/2292 ,  F16H61/47 ,  E02F9/2296

摘要： A working machine includes a prime mover, a traveling pump to be driven by the prime mover to output operation fluid, a traveling motor to be driven by the operation fluid outputted from the traveling pump and to change a motor speed between a first speed and a second speed higher than the first speed, a machine body on which the prime mover, the traveling pump, and the traveling motor are arranged, a traveling switching valve to be switched between a first state allowing the traveling motor to rotate at the first speed and a second state allowing the traveling motor to rotate at the second speed, and a controller to reduce a revolving speed of the prime mover based on a traveling condition of the machine body in switching the traveling switching valve between an accelerating state to switch the traveling switching valve from the first state to the second state and a decelerating state to switch the traveling switching valve from the second state to the first state.

公开(公告)号：US20230415808A1

公开(公告)日：2023-12-28

申请号：US18463839

申请日：2023-09-08

申请人： Great Plains Manufacturing, Inc.

发明人： Jason Carlson

IPC分类号： B62D1/12 ,  B60K26/02 ,  B62D11/02 ,  E02F3/42 ,  G05G9/00 ,  G05G5/02 ,  E02F9/20 ,  G05G5/04 ,  G05G5/05 ,  E02F9/02 ,  E02F9/22 ,  B62D11/00

CPC分类号： B62D1/12 ,  B60K26/02 ,  B62D11/02 ,  E02F3/422 ,  G05G9/00 ,  G05G5/02 ,  E02F9/2004 ,  G05G5/04 ,  G05G5/05 ,  E02F9/02 ,  E02F9/2087 ,  E02F9/225 ,  E02F9/2253 ,  B62D11/001 ,  E02F9/2285 ,  G05G2505/00 ,  E02F3/3414

摘要： A vehicle steering assembly for controlling movement of a vehicle having independently rotatable left and right ground-engaging traction elements. The steering assembly comprises a steering handle and a steering controller positioned generally below the steering handle and actuated by movement of the steering handle. The steering handle includes an upright shaft and a laterally-extending crossmember fixed to the top of the upright shaft. A flexible protective cover is attached to the shaft and is configured to prevent dirt and debris from entering the steering controller. The steering handle is shiftable in forward and rearward directions to thereby cause corresponding forward and rearward rotation of both of the left and right traction elements. The steering handle is rotatable in clockwise and counterclockwise directions to thereby cause a change in the relative speeds and directions of rotation of the left and right traction elements.

公开(公告)号：US20230407598A1

公开(公告)日：2023-12-21

申请号：US18036266

申请日：2021-11-01

申请人： Komatsu Ltd.

发明人： Kazuki Ichikawa ,  Masaaki Imaizumi ,  Ken Hirabayashi ,  Kento Niiyama

IPC分类号： E02F9/22 ,  E02F3/28 ,  E02F3/43 ,  F16D48/02

CPC分类号： E02F9/2253 ,  E02F3/283 ,  E02F3/431 ,  F16D48/02 ,  E02F9/2203

摘要： A work vehicle includes a power source, a travel device that includes a clutch capable of adjusting a degree of engagement between the power source and a transmission, and travels on a basis of power transmitted from the power source, working equipment, a drive device that operates the working equipment on a basis of power transmitted from the power source, and a control device that outputs a control command for controlling the degree of engagement of the clutch on a basis of a state of the working equipment.