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1. 发明公开

EP3839151A1 LOADING WORK VEHICLE 审中-实审
公开(公告)号：EP3839151A1
公开(公告)日：2021-06-23
申请号：EP18934549.9
申请日：2018-09-28
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： HYODO Koji , YOSHIKAWA Masaki , TANAKA Tetsuji , NUKII Masaki
IPC分类号： E02F9/22 , B66F9/24 , E02F3/43 , F16H61/40
摘要： Provided is a loading work vehicle capable of improving work efficiency even when working on a slippery road surface. An HST-traveling-drive wheel loader 1 comprises a step-on amount detection sensor 610, a discharge pressure detection sensor 75, a mode switch device 60, and a controller 5. The controller 5 is configured to: determine whether a limit mode is selected by the mode switch device 60; specify an operation state of the wheel loader 1 when determining that the limit mode is selected; limit maximum traction force to a first set value which is set based on a static friction coefficient µ and vehicle weight when specifying that a bucket 23 is pushed into a natural ground 100; and increase the maximum traction force from the first set value when specifying that excavation of the natural ground 100 is started.

2. 发明公开

EP4098811A1 WORK VEHICLE 审中-实审
公开(公告)号：EP4098811A1
公开(公告)日：2022-12-07
申请号：EP21872273.4
申请日：2021-09-15
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： SHIMOMURA Takuya , YOSHIKAWA Masaki , TANAKA Tetsuji , AOKI Isamu , ITO Kazuyuki , SHIMAZAKI Kouji , NAITOU Keisuke
IPC分类号： E02F9/22
摘要： Provided is a work vehicle capable of reducing the fuel consumption while maintaining the working efficiency. A wheel loader 1 comprising a vehicle body controller 5, 5A for controlling an engine 41, wherein the vehicle body controller 5, 5A limits an upper limit rotational speed of the engine 41 based on an accelerator pedal step-on amount α, a brake pedal step-on amount β, a torque converter speed ratio e which is a ratio of a rotational speed of a torque converter 42, a discharge pressure P1 of a loading hydraulic pump 44, and a stroke amount S1 of lift arm cylinders 22 or a stroke amount S2 of a bucket cylinder 24.

3. 发明公开

EP3832083A1 WORK MACHINE 有权
公开(公告)号：EP3832083A1
公开(公告)日：2021-06-09
申请号：EP19921816.5
申请日：2019-12-25
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： HYODO Koji , YOSHIKAWA Masaki , ITO Kazuyuki , TANAKA Tetsuji , SHIMAZAKI Kouji , AOKI Isamu
IPC分类号： F01P11/12 , B60K11/04 , B60K11/08 , E02F9/00 , F01M5/00 , F01P5/04 , F01P11/14
摘要： Provided is a work machine capable of notifying that maintenance is necessary due to continuation of clogging in a cooling device or decrease in cooling performance. A wheel loader 1 including a radiator 31 and an oil cooler 32 comprises a controller 5, 5A configured to determine a clogging continuation state of the radiator 31 or the oil cooler 32. The controller 5, 5A determines whether clogging is occurring in the radiator 31 or the oil cooler 32 based on outside air temperature AW and cooling water temperature CW or hydraulic oil temperature HW, determines whether the clogging continues based on a clogging occurrence ratio R1, R2 while an engine 30 is operating, and outputs a notification command signal for providing the alarm buzzer 61 and the user management system 62 with a command to notify that maintenance is necessary when it is determined that the clogging continues.

4. 发明公开

EP2796625A1 WORK VEHICLE 有权转让
标题翻译：工作车辆
公开(公告)号：EP2796625A1
公开(公告)日：2014-10-29
申请号：EP12859477.7
申请日：2012-10-05
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： AOKI Isamu , HYODO Koji , TANAKA Tetsuji , KIKUCHI Keigo
IPC分类号： E02F9/22 , E02F3/43
CPC分类号： E02F3/431 , E02F9/2079 , E02F9/2207 , E02F9/2217 , E02F9/2253 , E02F9/265
摘要： Provided is a work vehicle which is capable of appropriately setting the height of a work tool as a control threshold value for a ride control device or an automatic transmission control device, and which is excellent in operability, travel stability, and work efficiency. A value detected by an angle sensor (39) when a signal import switch (46) is operated by an operator is stored in a height position storage unit (35b) of a main controller (35) as height position information about a bucket (13) for excavation work. In the height position storage unit (35b), the height position of the bucket (13) for hauling work and the height position of the bucket (13) for loading work are stored in advance as offset values from the height position information about the bucket (13) for excavation work. In this way, the ride control device or the automatic transmission control device can be appropriately controlled regardless of the preference or habit of the operator.
摘要翻译：本发明提供一种作业车辆，其能够适当地设定作业工具的高度作为行驶控制装置或自动变速器控制装置的控制阈值，并且操作性，行驶稳定性和作业效率优异。当由操作员操作信号输入开关（46）时由角度传感器（39）检测到的值被存储在主控制器（35）的高度位置存储单元（35b）中作为关于铲斗（13）的高度位置信息）进行挖掘工作。在高度位置存储部（35b）中，作为搬运作业用铲斗（13）的高度位置和装载作业用铲斗（13）的高度位置，预先作为偏离铲斗高度位置信息（13）进行挖掘工作。这样，无论操作者的喜好或习惯如何，都可以适当地控制行驶控制装置或自动变速器控制装置。

5. 发明公开

EP2687704A1 DRIVE CONTROL DEVICE FOR WORK VEHICLE 有权转让
标题翻译： ANTRIEBSSTEUERVORRICHTUNGFÜREIN NUTZFAHRZEUG
公开(公告)号：EP2687704A1
公开(公告)日：2014-01-22
申请号：EP12761300.8
申请日：2012-03-15
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： TANAKA Tetsuji , HYODO Koji , AOKI Isamu , KIKUCHI Keigo
IPC分类号： F02D29/00 , F02D29/04
CPC分类号： E02F9/2066 , B60W30/18036 , B60W30/1884 , B60W30/1886 , B60W2520/06 , B60W2520/10 , B60W2540/10 , B60W2550/142 , B60W2710/0644 , B60Y2200/41 , F02D29/00 , F02D29/04 , Y10T477/60
摘要： To provide a drive control system for a working vehicle, which can prevent engine stall with certainty even when a large load suddenly acts on a vehicle-mounted engine and which is also excellent in environment friendly performance.
When a vehicle speed of a wheel loader (1) is determined to be not higher than a reference value (Yes) in step S4 and a forward/reverse command means (40) is determined to have been switchingly operated (Yes) in step S5, the routine advances to step S6 where an increment ΔN of engine speed according to an engine load factor is determined. In step S7, the increment ΔN of engine speed is then added to a target engine speed Na corresponding to a depression stroke of an accelerator pedal (38), the thus-determined Na=Na+ΔN is set as a new target engine speed Na, and a target engine speed command i1 is sent to an engine controller (37).
摘要翻译：为了提供一种用于工作车辆的驱动控制系统，即使当大负载突然起作用在车载发动机上并且环境友好性能也优异时，其能够确保发动机停止。当在步骤S4中将轮式装载机（1）的车速确定为不高于参考值（是）时，并且在步骤S5中确定正向/反向指令装置（40）已被切换操作（是），则进入步骤S6，其中确定根据发动机负载系数的发动机转速的增量“N”。在步骤S7中，将发动机转速的增量“N”加到与加速器踏板（38）的下压行程相对应的目标发动机转速Na，将这样确定的Na = Na +“N设定为新的目标发动机转速 Na，并且目标发动机转速指令i1被发送到发动机控制器（37）。

6. 发明公开

EP3825475A1 WHEEL LOADER 有权
公开(公告)号：EP3825475A1
公开(公告)日：2021-05-26
申请号：EP19922161.5
申请日：2019-12-25
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： TANAKA Tetsuji , NUKII Masaki , NAITOU Keisuke
IPC分类号： E02F9/20 , F16H61/02 , F16H61/68
摘要： Provided is a wheel loader capable of automatically decreasing vehicle speed without making an operator feel discomfort during a loading operation. A wheel loader 1 mounted with a torque converter type traveling drive system comprises a controller 5 configured to control shifting of a transmission 32. When a vehicle body travels forward at vehicle speed corresponding to a second speed stage set greater by one speed stage than the lowest speed stage of the transmission 32 while operating the lift arm 21 upwardly, the controller 5 sets, as a gear ratio of the transmission 32, an intermediate gear ratio between a gear ratio corresponding to the second speed stage and a gear ratio corresponding to a first speed stage, and outputs a signal for selecting a combination of a plurality of gears corresponding to the set gear ratio to each first to fifth solenoid control valves 32A to 32E.

7. 发明公开

EP3822471A1 WORK VEHICLE 审中-公开
公开(公告)号：EP3822471A1
公开(公告)日：2021-05-19
申请号：EP19864184.7
申请日：2019-09-24
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： HYODO Koji , TANAKA Tetsuji , AOKI Isamu , NUKII Masaki , AHIKO Yuki
IPC分类号： F02D29/04 , E02F9/20 , F02D29/00
摘要： Provided is a working vehicle capable of, while reducing fuel consumption, improving traveling performance only when high traveling performance is required.
A wheel loader 1 comprises: an engine 3; a variable displacement HST pump 41; a variable displacement HST motor 42 connected to the HST pump 41 through a closed circuit; pressure sensors 72A, 72B configured to load pressure of the HST motor 42; and a controller 5, wherein the controller 5 is configured to, in a case of determining that a load pressure detection value P is included in a predetermined pressure range of greater than load pressure Pα corresponding to flat ground traveling and smaller than load pressure Pγ corresponding to an excavation operation, increase maximum rotational speed of the engine 3 only within the predetermined pressure range.

8. 发明公开

EP3656622A1 WORK VEHICLE 有权
公开(公告)号：EP3656622A1
公开(公告)日：2020-05-27
申请号：EP19774358.6
申请日：2019-03-15
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： HYODO Koji , TANAKA Tetsuji , AOKI Isamu , SHIMAZAKI Kouji
IPC分类号： B60T17/22 , E02F3/43
摘要： A work vehicle is provided. The work vehicle is capable of notifying an operator of a state close to overheating of a temperature of a cooling oil that cools a brake device before the temperature overheats. A controller (10) in a work vehicle (100) compares each detection value detected from a brake pressure sensor (26) and a vehicle speed sensor (15) to each threshold (V1, P1, R1) predetermined corresponding to each sensor. The controller (10) outputs a warning command that a temperature of a cooling oil is likely to overheat to a notification device (28) when a state that at least one detection value is equal to or more than the threshold and when a state that at least one detection value is equal to or more than the threshold continues for a first duration (t1) or more.

9. 发明授权

EP2910396B1 OPERATION VEHICLE TRAVEL CONTROL DEVICE 有权转让
公开(公告)号：EP2910396B1
公开(公告)日：2019-12-11
申请号：EP13846459.9
申请日：2013-10-11
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： TANAKA Tetsuji , YOSHIKAWA Masaki , HIDAKA Nobuyuki , AOKI Isamu , KIKUCHI Keigo
IPC分类号： B60K20/02 , F16H59/02 , F16H59/04

10. 发明授权

EP2687704B1 DRIVE CONTROL DEVICE FOR WORK VEHICLE 有权转让
标题翻译：驱动控制装置是用于商用车
公开(公告)号：EP2687704B1
公开(公告)日：2016-06-08
申请号：EP12761300.8
申请日：2012-03-15
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： TANAKA Tetsuji , HYODO Koji , AOKI Isamu , KIKUCHI Keigo
IPC分类号： B60W30/188 , F02D29/00 , F02D29/04 , E02F9/20 , B60W30/18
CPC分类号： E02F9/2066 , B60W30/18036 , B60W30/1884 , B60W30/1886 , B60W2520/06 , B60W2520/10 , B60W2540/10 , B60W2550/142 , B60W2710/0644 , B60Y2200/41 , F02D29/00 , F02D29/04 , Y10T477/60

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