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    CONSTRUCTION MACHINE
    1.
    发明申请
    CONSTRUCTION MACHINE 审中-公开

    公开(公告)号：US20180305898A1

    公开(公告)日：2018-10-25

    申请号：US15768841

    申请日：2016-12-05

    Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.

    Inventor： Hiroyuki KOBAYASHI ,  Hiroshi SAKAMOTO ,  Yasutaka TSURUGA

    IPC: E02F9/22

    CPC classification number: E02F9/2228 ,  E02F3/435 ,  E02F9/2235 ,  E02F9/2267 ,  E02F9/2271 ,  E02F9/2285 ,  E02F9/2292 ,  E02F9/2296 ,  F15B11/04 ,  F15B11/08 ,  F15B2211/30525 ,  F15B2211/526 ,  F15B2211/6653

    Abstract: A construction machine that can ensure an initial response that varies in accordance with a hydraulic actuator in a similar fashion to a case of adopting a hydraulic pilot-type operation device is provided. A controller 100 of a hydraulic excavator outputs a command current for driving the corresponding solenoid proportional valve (i.e. some of solenoid proportional valves 41a, 41b, 42a to 42d, 43a to 43d, 44a and 44b) in response to an operation signal from an electric lever-type work operation device 2a or 2b, and includes a correction function to correct the command current such that the command current is higher than a target current corresponding to an operation amount of the operation device for preset predetermined time at a time of starting to operate the operation device from a neutral position thereof. This correction function corrects only the command current to the bucket solenoid proportional valves 44a and 44b.

    ELECTRIC DRIVE VEHICLE
    2.
    发明申请
    ELECTRIC DRIVE VEHICLE 有权
    电动车

    公开(公告)号：US20150298577A1

    公开(公告)日：2015-10-22

    申请号：US14395573

    申请日：2013-04-11

    Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.

    Inventor： Hiroyuki KOBAYASHI ,  Akira KIKUCHI ,  Tomohiko YASUDA ,  Takayuki SATO ,  Shinjiro SAITO

    IPC: B60L15/20

    CPC classification number: B60L15/2072 ,  B60L3/106 ,  B60L15/20 ,  B60L15/2009 ,  B60L2200/36 ,  B60L2220/46 ,  B60L2240/421 ,  B60L2240/423 ,  B60L2240/461 ,  B60L2240/465 ,  B60L2260/28 ,  B60L2270/145 ,  Y02T10/645 ,  Y02T10/646 ,  Y02T10/7275

    Abstract: Provided is an electric drive vehicle which can control wheel speed so as to achieve an appropriate slip ratio of the wheels even when pitching vibration of the vehicle is large. This electric drive vehicle is provided with electric motors (1, 4), drive wheels (3, 6), driven wheels (7, 8), an electric motor controller (50) for controlling the electric motors, and speed detectors (9-12) for detecting the wheel speed of the drive wheels and the driven wheels. The electric motor controller is provided with: a slip ratio calculation unit (21) which calculates the slip ratio of the drive wheels from the wheel speed detected values detected by the speed detectors; a torque command calculation unit (20) which calculates torque commands for the drive wheels; a drive force calculation unit (19) which, from the wheel speed detected values of the drive wheels and the torque commands of the drive wheels, calculates the drive force generated in the drive wheels; and filters (54, 55) which reduce the pitching vibration frequency components of the vehicle included in the slip ratio and the drive force.

    Abstract translation: 提供了一种能够控制车轮速度以便即使当车辆的俯仰振动较大时车轮的适当滑移率的电动车辆。 该电动车辆设置有电动机（1,4），驱动轮（3,6），从动轮（7,8），用于控制电动机的电动机控制器（50）和速度检测器（9- 12），用于检测驱动轮和从动轮的车轮速度。 电动机控制装置具备：滑差比计算部（21），根据由速度检测器检测出的车轮速度检测值来计算驱动轮的滑移率; 扭矩指令计算单元（20），其计算用于所述驱动轮的扭矩指令; 驱动力计算单元，根据驱动轮的车轮速度检测值和驱动轮的转矩指令，计算在驱动轮中产生的驱动力; 以及减小包含在滑移率中的车辆的俯仰振动频率分量和驱动力的过滤器（54,55）。

    Work Vehicle
    4.
    发明公开
    Work Vehicle 审中-公开

    公开(公告)号：US20230313488A1

    公开(公告)日：2023-10-05

    申请号：US18021202

    申请日：2022-02-18

    Applicant: Hitachi Construction Machinery Co., Ltd.

    Inventor： Masatoshi YOSHIMURA ,  Hiroyuki KOBAYASHI ,  Satoru KANEKO ,  Noritaka ITOU ,  Satoshi SEKINO

    IPC: E02F3/43 ,  E02F9/20 ,  E02F9/22

    CPC classification number: E02F3/434 ,  E02F9/2075 ,  E02F9/2079 ,  E02F9/2235

    Abstract: The work vehicle 1 includes a main controller 100 that controls a travel driving force and a work driving force. The main controller 100 includes a travel remaining time calculating unit 111 that calculates a remaining time until a target rise/run distance is reached as a travel remaining time tC, a work remaining time calculating unit 112 that calculates a remaining time until a target arm angle is reached as a work remaining time t1, a rise/run determining unit 113 that determines whether rise/run is being performed or not, a correction rate setting unit 114 that sets a travel correction rate ηC that adjusts a travel driving torque and a work correction rate ηI that adjusts a work driving torque based on the travel remaining time tC, the work remaining time t1, and the rise/run determination flag, and an engine torque distribution calculating unit 115 that calculates a travel driving torque command and a work driving torque command based on the travel correction rate ηC and the work correction rate ηI.

    Work Machine
    5.
    发明申请
    Work Machine 有权

    公开(公告)号：US20210207345A1

    公开(公告)日：2021-07-08

    申请号：US17057414

    申请日：2019-06-11

    Applicant: Hitachi Construction Machinery Co., Ltd.

    Inventor： Hiroyuki KOBAYASHI ,  Yoshiyuki TSUCHIE ,  Hidekazu MORIKI ,  Hiroshi SAKAMOTO

    IPC: E02F9/22 ,  F15B11/028 ,  F15B11/08 ,  F15B21/045

    Abstract: Provided is a work machine with which responsiveness of a hydraulic actuator can be improved when driving the hydraulic actuator through an electric lever-type operation device. A controller 100 further includes: an operation direction determining section 116 configured to determine operation directions of operation devices 2a and 2b; and a standby pressure switching command section 117 configured to output a standby pressure switching command to a first target pilot pressure correction section 112 or a second target pilot pressure correction section 113 which corresponds to a solenoid proportional valve that does not correspond to the operation direction from among first solenoid proportional valves 41a, 42a, 42b, 43a, 43b, and 44a and second solenoid proportional valves 41b, 42c, 42d, 43c, 43d, and 44b. The first target pilot pressure correction section and the second target pilot pressure correction section are configured to switch a first standby pressure α to a second standby pressure β set lower than the first standby pressure in a case in which the standby pressure switching command has been inputted.

    Control System for Construction Machine
    7.
    发明申请
    Control System for Construction Machine 审中-公开

    公开(公告)号：US20180119386A1

    公开(公告)日：2018-05-03

    申请号：US15567723

    申请日：2016-02-23

    Applicant: Hitachi Construction Machinery Co., Ltd.

    Inventor： Hiroyuki KOBAYASHI ,  Hiroshi SAKAMOTO ,  Yoshiyuki TSUCHIE ,  Hidekazu MORIKI ,  Yasutaka TSURUGA

    IPC: E02F9/20 ,  E02F3/32 ,  E02F9/22

    CPC classification number: E02F9/2025 ,  E02F3/32 ,  E02F9/2004 ,  E02F9/2037 ,  E02F9/22 ,  E02F9/2285 ,  F15B11/08

    Abstract: At times of a travel-solo state of the machine body, the outputting of unnecessary electric lever operating device signals caused by machine body oscillation due to the traveling is inhibited. At times of traveling work, the output limitation of electric lever operating device signals necessary for work is inhibited. A control system for a construction machine includes an electric lever operating device that outputs a command to a hydraulic actuator, a travel control lever device that outputs a command to a travel device, and a controller that outputs a drive command to a solenoid proportional valve that decompresses hydraulic fluid supplied from a pilot hydraulic source. The control system includes a machine body state judgment part that judges the state of the machine body based on an electric signal from the electric lever operating device and an operation amount of the travel control lever device and a dead zone calculation part that calculates a dead zone for the electric signal from the electric lever operating device based on the state of the machine body. The dead zone calculation part sets the dead zone for the electric signal at a first predetermined value when the machine body is in the travel-solo state and sets the dead zone for the electric signal at a second predetermined value smaller than the first predetermined value when the machine body is in the traveling work state.

    CONSTRUCTION MACHINE
    8.
    发明申请
    CONSTRUCTION MACHINE 审中-公开

    公开(公告)号：US20190040605A1

    公开(公告)日：2019-02-07

    申请号：US16082552

    申请日：2017-09-20

    Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.

    Inventor： Hiroyuki KOBAYASHI ,  Hiroshi SAKAMOTO ,  Yoshiyuki TSUCHIE

    IPC: E02F3/43 ,  E02F9/22

    Abstract: Lever neutrality is determined by whether or not operation levers are at a neutral position based on operation signals from operation levers. Pilot pressures are computed based on the operation signals from the operation levers; and pilot pressure signals are converted to current signals. A current interruption controller controls interruption and communication of the current signals to the solenoid proportional valves; and an operating condition is determined by determining whether a construction machine is in a manual operation state or a semiautomatic operation state. At least one hydraulic actuator is controlled to assist the operation of the operator, and when it is determined that the construction machine is in the semiautomatic operation state, the current interruption controller interrupts the current signals to all of the solenoid proportional valves only when it is determined that all the operation levers are at the neutral position.

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