公开(公告)号：US11795663B2

公开(公告)日：2023-10-24

申请号：US17605742

申请日：2020-06-08

Applicant: KOMATSU LTD.

Inventor： Kenichi Yamada ,  Hiroaki Ikeda

IPC: E02F9/22 ,  F16H59/44 ,  F16H59/54 ,  F16H59/68 ,  F16H61/4017

CPC classification number: E02F9/2253 ,  F16H59/44 ,  F16H59/54 ,  F16H59/68 ,  F16H61/4017 ,  F16H2059/6861

Abstract: A work vehicle includes a power source, a travel device, a power transmission device, and a control device. The power transmission device includes a hydrostatic continuously variable transmission having a relief valve capable of setting a relief pressure, and is configured to transmit power of the power source to the travel device. The control device includes a relief pressure setting unit configured to set the relief pressure of the relief valve in accordance with a target output value of the travel device.

公开(公告)号：US09707958B2

公开(公告)日：2017-07-18

申请号：US14903651

申请日：2015-01-14

Applicant: KOMATSU LTD.

Inventor： Kenichi Yamada ,  Shunsuke Miyamoto

IPC: B60W30/02 ,  F16H61/04 ,  B60W10/10 ,  B60W10/18 ,  B60W10/30 ,  E02F3/28 ,  E02F9/20 ,  F16H59/18 ,  F16H59/44 ,  F16H59/54 ,  F16H59/48

CPC classification number: B60W30/02 ,  B60W10/10 ,  B60W10/18 ,  B60W10/30 ,  B60W2300/17 ,  B60W2540/10 ,  B60W2710/10 ,  B60W2710/18 ,  B60W2710/30 ,  B60Y2200/415 ,  E02F3/283 ,  E02F9/202 ,  E02F9/2079 ,  F16H59/18 ,  F16H59/44 ,  F16H59/48 ,  F16H59/54 ,  F16H61/0437

Abstract: A control unit in a work vehicle executes an automatic downshift for shifting a speed range of a transmission to the speed range at a lower speed than a current speed range. The control unit determines the execution of the automatic downshift on the basis of automatic downshift conditions. The automatic downshift conditions include whether the operating amount of the accelerator operating member is equal to or greater than a predetermined accelerator threshold, whether the vehicle speed is less than a predetermined speed threshold, and whether the acceleration is equal to or less than a predetermined acceleration threshold.

公开(公告)号：US09605414B2

公开(公告)日：2017-03-28

申请号：US14889200

申请日：2014-12-09

Applicant: KOMATSU LTD.

Inventor： Kenichi Yamada ,  Masao Yoshizawa

IPC: E02F9/22 ,  E02F9/20 ,  E02F3/28 ,  B60K6/445 ,  F02D29/00 ,  F02D29/04 ,  F15B11/02 ,  B60K6/387 ,  B60W10/06 ,  B60W10/30 ,  B60W30/188 ,  B60K6/38 ,  F02D29/06

CPC classification number: E02F9/2246 ,  B60K6/387 ,  B60K6/445 ,  B60K2006/381 ,  B60W10/06 ,  B60W10/30 ,  B60W30/1886 ,  E02F3/283 ,  E02F9/202 ,  E02F9/2066 ,  E02F9/2235 ,  E02F9/2253 ,  E02F9/2289 ,  E02F9/2292 ,  E02F9/2296 ,  F02D29/00 ,  F02D29/04 ,  F02D29/06 ,  F15B11/02 ,  F15B2211/20523 ,  F15B2211/20546 ,  F15B2211/50518 ,  F15B2211/5151 ,  F15B2211/6651 ,  F15B2211/6652 ,  F15B2211/6654 ,  Y02T10/6239

Abstract: A transmission requirement setting unit sets a required traction force in a work vehicle based on an accelerator operation amount. A work implement requirement setting unit sets a required flow rate based on a work implement operation amount. An engine requirement setting unit determines the horsepower required based on the horsepower required by the transmission set based on the required traction force and the horsepower required by the work implement set based on the required flow rate. A required throttle setting unit determines a commanded throttle value based on the horsepower required. A pump displacement setting unit sets a target displacement for the hydraulic pump based on the required flow rate. The work implement requirement setting unit sets an upper limit for the required flow rate to a prescribed flow rate limit value when the discharge pressure of the hydraulic pump is at or above a prescribed pressure threshold.

公开(公告)号：US11629481B2

公开(公告)日：2023-04-18

申请号：US17420157

申请日：2020-03-06

Applicant: KOMATSU LTD.

Inventor： Yuita Takenaka ,  Kenichi Yamada

IPC: B60W30/188 ,  E02F9/22 ,  B60W10/06 ,  B60W10/10 ,  E02F9/20 ,  E02F3/28

Abstract: A work machine includes an engine, a travel drive system, a work implement, an apparatus drive system with a hydraulic pump, an accelerator operating member, a work implement operating member, and a controller. The controller controls the apparatus drive system in accordance with an operating amount of the work implement operating member. The controller determines a target tractive force of the travel drive system based on an operating amount of the accelerator operating member. The controller determines an allowable acceleration of the work machine. The controller determines an upper limit of tractive force of the travel drive system based on the allowable acceleration. The controller corrects the target tractive force so as to be equal to or less than the upper limit when the target tractive force is greater than the upper limit. The controller controls the travel drive system based on the corrected target tractive force.

公开(公告)号：US11952749B2

公开(公告)日：2024-04-09

申请号：US17289423

申请日：2019-11-07

Applicant: KOMATSU LTD.

Inventor： Kenichi Yamada ,  Shogo Miyazaki ,  Akira Takeno ,  Shota Yamawaki

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

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

Abstract: 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：US10011273B2

公开(公告)日：2018-07-03

申请号：US15622321

申请日：2017-06-14

Applicant: KOMATSU LTD.

Inventor： Kenichi Yamada ,  Shunsuke Miyamoto

IPC: B60W30/02 ,  F16H61/04 ,  B60W10/10 ,  B60W10/18 ,  B60W10/30 ,  E02F3/28 ,  E02F9/20 ,  F16H59/18 ,  F16H59/44 ,  F16H59/54 ,  F16H59/48

CPC classification number: B60W30/02 ,  B60W10/10 ,  B60W10/18 ,  B60W10/30 ,  B60W2300/17 ,  B60W2540/10 ,  B60W2710/10 ,  B60W2710/18 ,  B60W2710/30 ,  B60Y2200/415 ,  E02F3/283 ,  E02F9/202 ,  E02F9/2079 ,  F16H59/18 ,  F16H59/44 ,  F16H59/48 ,  F16H59/54 ,  F16H61/0437 ,  F16H61/16 ,  F16H2061/0234

Abstract: A control unit in a work vehicle executes an automatic downshift for shifting a transmission from a current speed range to a speed range that is lower than the current speed range when at least a first condition, a second condition, a third condition, and a fourth condition are satisfied. The first condition is that an operating amount of an accelerator operating member of the work vehicle is equal to or greater than a predetermined accelerator threshold. The second condition is that a vehicle speed of the work vehicle is less than a predetermined speed threshold. The third condition is that a vehicle acceleration of the work vehicle is equal to or less than a predetermined acceleration threshold. The fourth condition is that that the hydraulic pressure of a hydraulic fluid supplied to a brake device of the work vehicle is less than a predetermined brake threshold.

公开(公告)号：US09593468B2

公开(公告)日：2017-03-14

申请号：US14892703

申请日：2014-12-17

Applicant: KOMATSU LTD.

Inventor： Kenichi Yamada ,  Shunsuke Miyamoto

IPC: G06F7/70 ,  E02F9/22 ,  B60K6/28 ,  B60K6/445 ,  B60K6/50 ,  B60K6/547 ,  B60K25/02 ,  B60W10/06 ,  B60W10/30 ,  B60W20/00 ,  F02D29/04 ,  B60K6/365 ,  B60K6/387 ,  E02F9/20 ,  B60W10/08 ,  B60W10/105 ,  B60K6/38

CPC classification number: E02F9/2246 ,  B60K6/28 ,  B60K6/365 ,  B60K6/387 ,  B60K6/445 ,  B60K6/50 ,  B60K6/547 ,  B60K25/02 ,  B60K2006/381 ,  B60W10/06 ,  B60W10/08 ,  B60W10/105 ,  B60W10/30 ,  B60W20/00 ,  B60W20/10 ,  B60W2300/17 ,  B60W2510/0638 ,  B60W2510/0666 ,  B60W2510/1035 ,  B60W2510/244 ,  B60W2510/305 ,  B60W2520/10 ,  B60W2520/12 ,  B60W2540/10 ,  B60W2540/16 ,  B60W2710/0666 ,  B60W2710/083 ,  B60W2710/1005 ,  B60W2710/1022 ,  B60W2710/105 ,  B60W2710/1061 ,  B60W2710/305 ,  E02F9/2066 ,  E02F9/2075 ,  E02F9/2079 ,  E02F9/2253 ,  E02F9/2289 ,  E02F9/2292 ,  E02F9/2296 ,  F02D29/04 ,  Y02T10/6239 ,  Y10S903/93

Abstract: A work implement requirement determination unit of a work vehicle determines a work implement required power based on the operation amount of a work implement operating member and the work implement pump pressure. A transmission requirement determination unit determines a transmission required power based on the vehicle speed and the operation amount of the accelerator operating member. When the sum of the work implement required power and the transmission required power is greater than a first distributable power that a predetermined preferential distribution power subtracted from a load upper limit power of the engine leaves, a distribution ratio determination unit allocates the smaller of a transmission compensation power and the transmission required power to a power transmission device and distributes the remainder of the first distributable power to the work implement pump and to a power transmission device.

Abstract translation: 作业车辆的作业要求确定单元基于作业工具操作构件的操作量和作业工具泵的压力来确定作业工具所需的动力。 发送需求确定单元基于车速和加速器操作构件的操作量确定发送所需电力。 当工作实现所需功率和传输所需功率的总和大于从发动机的负载上限功率所减去的预定优先分配功率的第一可分配功率时，分配比率确定单元分配较小的传输 补偿功率和对功率传输装置的传输所需的功率，并将第一可分配功率的剩余部分分配到工作装置泵和功率传输装置。

公开(公告)号：US09341200B2

公开(公告)日：2016-05-17

申请号：US14759039

申请日：2014-09-03

Applicant: KOMATSU LTD.

Inventor： Shunsuke Miyamoto ,  Kenichi Yamada ,  Yasunori Ohkura ,  Yasuki Kishimoto ,  Masao Yoshizawa

IPC: F15B1/02 ,  F15B21/00 ,  B60K6/445 ,  B60L11/14 ,  B60L11/18 ,  B60W10/08 ,  B60W10/10 ,  B60W10/26 ,  B60W20/00 ,  F16H3/66 ,  F16H3/72 ,  F16H37/10

CPC classification number: F15B21/001 ,  B60K6/12 ,  B60K6/365 ,  B60K6/387 ,  B60K6/445 ,  B60K6/547 ,  B60K2006/381 ,  B60L7/18 ,  B60L11/14 ,  B60L11/18 ,  B60L11/1861 ,  B60L2200/40 ,  B60L2240/12 ,  B60L2240/421 ,  B60L2260/26 ,  B60W10/06 ,  B60W10/08 ,  B60W10/10 ,  B60W10/115 ,  B60W10/26 ,  B60W20/00 ,  B60W20/10 ,  B60W30/18045 ,  B60W2300/17 ,  B60W2710/0666 ,  B60W2710/083 ,  E02F9/202 ,  E02F9/2079 ,  F15B1/02 ,  F15B2201/00 ,  F16H3/66 ,  F16H3/72 ,  F16H3/728 ,  F16H2037/101 ,  F16H2200/2007 ,  F16H2200/2041 ,  Y02T10/6208 ,  Y02T10/6239 ,  Y02T10/6282 ,  Y02T10/6286 ,  Y02T10/642 ,  Y02T10/7005 ,  Y02T10/7044 ,  Y02T10/705

Abstract: The target input shaft torque determination unit determines a target input shaft torque. The target output shaft torque determination unit determines a target output shaft torque so that a deceleration force for decelerating the vehicle is generated on the output shaft of the power transmission device in a state in which connection and disconnection states of the forward travel clutch and the reverse travel clutch are maintained at the state before the start of the shuttle action when the shuttle action is started. The torque-balance information is stored in a storage unit and defines a relationship between the target input shaft torque and the target output shaft torque to achieve a balance of the torques of a power transmission device. The command torque determination unit uses the torque-balance information to determine torque commands for the motor from the target input shaft torque and the target output shaft torque.

Abstract translation: 目标输入轴转矩确定单元确定目标输入轴转矩。 目标输出轴转矩确定单元确定目标输出轴扭矩，使得在前进行驶离合器和倒车的连接和断开状态的状态下，在动力传递装置的输出轴上产生用于减速的减速力 行驶离合器保持在穿梭动作开始前的状态。 转矩平衡信息存储在存储单元中，并且定义目标输入轴转矩和目标输出轴转矩之间的关系，以实现动力传递装置的转矩的平衡。 指令转矩确定单元使用转矩平衡信息，从目标输入轴转矩和目标输出轴转矩来确定电动机的转矩指令。

公开(公告)号：US11953091B2

公开(公告)日：2024-04-09

申请号：US17603713

申请日：2020-06-08

Applicant: KOMATSU LTD.

Inventor： Shogo Miyazaki ,  Shinya Kawakita ,  Kenichi Yamada

IPC: F16H61/475 ,  F16H61/00 ,  F16H61/4017 ,  F16H3/72

CPC classification number: F16H61/475 ,  F16H61/0021 ,  F16H61/4017 ,  F16H3/727

Abstract: A power transmission device includes an input shaft, an output shaft, a differential device, a continuously variable transmission unit, and a control device. The differential device includes a first rotation element connected to the input shaft, a second rotation element connected to the output shaft, and a third rotation element. The continuously variable transmission unit includes a conversion unit configured to convert rotational power of the third rotation element into an other power, and a reconversion unit configured to reconvert the converted other power into the rotational power and supply the reconverted rotational power to the output shaft. The control device includes a continuously variable transmission control unit configured to generate a control signal of the continuously variable transmission unit such that the other power generated by the conversion unit exceeds the other power input to the reconversion unit.

公开(公告)号：US10174483B2

公开(公告)日：2019-01-08

申请号：US14904487

申请日：2014-12-10

Applicant: KOMATSU LTD.

Inventor： Shunsuke Miyamoto ,  Kenichi Yamada ,  Kaoru Yasuda

IPC: B60W10/08 ,  E02F9/20 ,  B60K6/445 ,  B60L11/14 ,  B60W10/10 ,  B60W20/00 ,  B60L11/00 ,  B60L11/12 ,  B60L15/20 ,  B60K6/365 ,  B60K6/387 ,  B60K6/547 ,  H02P5/747 ,  B60K6/54 ,  E02F3/28 ,  F16H3/72 ,  E02F3/34 ,  B60K6/38 ,  B60K6/44

Abstract: A power transmission device of a work vehicle has an input shaft, an output shaft, a gear mechanism, and an electric motor. The gear mechanism has a planetary gear mechanism and transmits the rotation of the input shaft to the output shaft. The electric motor is connected to a rotating element of the planetary gear mechanism. The power transmission device is configured to change the rotation speed ratio of the output shaft with respect to the input shaft by changing the rotation speed of the electric motor. A control unit has a target torque determination unit and a target torque correcting unit. The target torque determination unit determines a target torque of the electric motor. The target torque correcting unit corrects the target torque according to a correction torque based on a moment of inertia of the electric motor.