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公开(公告)号：US20210270016A1
公开(公告)日：2021-09-02
申请号：US17272673
申请日：2019-12-25
发明人： Koji HYODO , Masaki YOSHIKAWA , Kazuyuki ITO , Tetsuji TANAKA , Kouji SHIMAZAKI , Isamu AOKI
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.
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公开(公告)号：US20150098783A1
公开(公告)日：2015-04-09
申请号：US14504678
申请日：2014-10-02
发明人： Koji HYODO , Takashi TAKEYAMA , Tetsuji TANAKA , Isamu AOKI , Katsutaka HARA , Tatsuo OOUCHI
CPC分类号： E02F9/2246 , E02F3/283 , E02F9/0883 , E02F9/2235 , E02F9/226 , E02F9/2296 , F01N3/208 , F01N11/00 , F01N2550/05 , F01N2590/08 , F01N2900/0412 , F01N2900/08 , F01N2900/1814 , F02D31/001 , F02D41/021 , F02D41/0235 , F02D2200/101 , F02D2250/18 , F02D2250/26 , F02D2250/36 , Y02A50/2325 , Y02T10/24
摘要： A work vehicle including a front work device, contains: a variable displacement hydraulic pump that is driven by an engine and supplies pressure oil to an actuator that drives the front work device; an exhaust gas purification device that purifies nitrogen oxide in exhaust gas discharged from the engine using a reducing agent solution stored in a reducing agent tank; a remaining amount detection device that detects a remaining amount of the reducing agent solution in the reducing agent tank; and a control unit that decreases output torque of the engine and also decreases a rotational speed of the engine in a rated point according to decrease of the remaining amount of the reducing agent solution detected by the remaining amount detection device.
摘要翻译： 一种包括前工作装置的工作车辆，包括：可变排量液压泵，其由发动机驱动，并将压力油供给到驱动前作业装置的致动器; 使用存储在还原剂槽中的还原剂溶液净化从发动机排出的废气中的氮氧化物的废气净化装置; 剩余量检测装置，其检测还原剂槽中的还原剂溶液的剩余量; 以及控制单元，其减小发动机的输出转矩并且还根据由剩余量检测装置检测到的还原剂溶液的剩余量的减少而在额定点降低发动机的转速。
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公开(公告)号：US20220356677A1
公开(公告)日：2022-11-10
申请号：US17638296
申请日：2021-03-15
发明人： Yasunori MIYAMOTO , Tetsuji TANAKA
摘要： Provided is a work vehicle which can prevent an engine from stalling regardless of type of a system mounted on a vehicle body. In a wheel loader 1 equipped with a loading work device 11 operated by an electric operation lever 19, first and second directional control valves 5, 6 include neutral positions 5N, 6N for causing hydraulic oil discharged from a hydraulic pump 12 to return to a hydraulic oil tank 10, respectively, and in the case where a discharge pressure P of the hydraulic pump 12 is a main relief pressure Pr or more and an engine rotational speed N is less than a low idle rotational speed NL, a controller 2, 2A restricts the output of control signals to first and second solenoid control valves 3, 4 so as to cause the first and second directional control valves 5, 6 to be switched to the neutral positions 5N, 6N, respectively.
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公开(公告)号：US20210002865A1
公开(公告)日：2021-01-07
申请号：US16980055
申请日：2019-09-24
发明人： Koji HYODO , Tetsuji TANAKA , Isamu AOKI , Masaki NUKII , Yuki AHIKO
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 Pa 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.-
公开(公告)号：US20160201294A1
公开(公告)日：2016-07-14
申请号：US14914342
申请日：2014-12-08
发明人： Isamu AOKI , Keigo KIKUCHI , Tetsuji TANAKA , Kentaro OOMAE
CPC分类号： E02F9/2066 , F02D29/04 , F02D41/0097 , F02D41/021 , F02D41/0215 , F02D41/107 , F02D41/12 , F02D2200/101 , F02D2200/1012 , F02D2200/602 , F16H59/18 , F16H61/42 , F16H63/50
摘要： A work vehicle equipped with an HST traveling drive device, includes: an operation quantity detector that detects an operation quantity representing an extent to which an accelerator pedal is operated; a rotation rate detector that detects an actual rotation rate at a prime mover; a requested rotation rate calculation unit that calculates a requested rotation rate for the prime mover based upon the operation quantity detected by the operation quantity detector; and a prime mover control unit that controls the actual rotation rate based upon the requested rotation rate calculated by the requested rotation rate calculation unit. When the requested rotation rate is higher than a predetermined value, the requested rotation rate calculation unit calculates a rate of acceleration for the requested rotation rate based upon a difference between the requested and the actual rotation rate detected by the rotation rate detector and calculates the requested rotation rate based upon the calculated rate of acceleration.
摘要翻译： 配备有HST行驶驱动装置的作业车辆包括：操作量检测器，其检测表示加速踏板被操作的程度的操作量; 旋转速率检测器，其检测原动机的实际转速; 请求转速计算单元，其基于由操作量检测器检测到的操作量来计算原动机的请求转速; 以及原动机控制单元，其基于由所请求的转速计算单元计算出的所请求的转速来控制实际的转速。 当所请求的转速高于预定值时，所请求的转速计算单元基于由转速检测器检测到的所请求转速与实际转速之间的差来计算所请求转速的加速度， 基于计算出的加速度的转速。
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公开(公告)号：US20150098784A1
公开(公告)日：2015-04-09
申请号：US14505685
申请日：2014-10-03
发明人： Koji HYODO , Atsushi SHIMAZU , Masashi YAMASHITA , Tetsuji TANAKA , Isamu AOKI , Shoroku KAWAHARA
CPC分类号： E02F9/2246 , E02F3/283 , E02F9/0883 , E02F9/2066 , E02F9/2278 , E02F9/2289 , F01N3/2066 , F01N11/00 , F01N2550/05 , F01N2590/08 , F01N2610/02 , F01N2900/1814 , F02D41/0097 , F02D41/0235 , F02D2200/101 , F02D2250/26 , F02D2250/36 , Y02A50/2325
摘要： A work vehicle includes: a hydraulic pump driven by an engine; a rotational speed detection unit that detects an actual rotational speed of the engine; an exhaust gas purification device that purifies nitrogen oxide in exhaust gas discharged from the engine using a reducing agent solution stored in a reducing agent tank; a torque control unit that decreases output torque of the engine according to decrease of a detected remaining amount of the reducing agent solution; and a storage device that stores a threshold value not less than an engine rotational speed at which the hydraulic pump starts discharge, wherein when the actual rotational speed of the engine is not more than the threshold value, the torque control unit does not decrease the output torque of the engine regardless of the remaining amount of the reducing agent solution detected by the remaining amount detection device.
摘要翻译： 工作车辆包括：由发动机驱动的液压泵; 转速检测单元，其检测发动机的实际转速; 使用存储在还原剂罐中的还原剂溶液净化从发动机排出的废气中的氮氧化物的排气净化装置; 扭矩控制单元，其根据检测出的还原剂溶液剩余量的减少而减小发动机的输出转矩; 以及存储装置，其存储不低于所述液压泵开始排出的发动机转速的阈值，其中，当所述发动机的实际转速不大于所述阈值时，所述转矩控制单元不会减小所述输出 发动机的扭矩，而与由剩余量检测装置检测到的还原剂溶液的剩余量无关。
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公开(公告)号：US20230085666A1
公开(公告)日：2023-03-23
申请号：US17907990
申请日：2021-09-15
发明人： Takuya SHIMOMURA , Masaki YOSHIKAWA , Tetsuji TANAKA , Isamu AOKI , Kazuyuki ITO , Kouji SHIMAZAKI , Keisuke NAITOU
IPC分类号： E02F9/22 , F16H61/4008
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.
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公开(公告)号：US20210189690A1
公开(公告)日：2021-06-24
申请号：US17273844
申请日：2018-09-28
发明人： Koji HYODO , Masaki YOSHIKAWA , Tetsuji TANAKA , Masaki NUKII
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.
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公开(公告)号：US20210047801A1
公开(公告)日：2021-02-18
申请号：US16979975
申请日：2019-09-24
发明人： Tetsuji TANAKA , Koji HYODO , Yasunori MIYAMOTO , Isamu AOKI
摘要： Provided is a working vehicle capable of increasing lifting operation speed of a working device without increasing cost, even when provided with a circuit configuration that prioritizes a steering operation over a working device operation.
A wheel loader 1 comprises a priority valve 451 configured to allow hydraulic oil discharged from a hydraulic pump 41 to flow into a steering drive circuit 43 preferentially over a working device drive circuit 44, and further comprises: an electric steering lever 30; a pair of solenoid control valves 34A, 34B configured to control a steering directional control valve 33; and a controller 5. The controller 5 is configured to control the pair of solenoid control valves 34A, 34B so as to limit operation speed of a steering 3 when determining that an engine 40 is in a low idle state and a lift arm 21 is performing a lifting operation.-
公开(公告)号：US20200248436A1
公开(公告)日：2020-08-06
申请号：US16641735
申请日：2018-09-04
发明人： Koji HYODO , Isamu AOKI , Tetsuji TANAKA , Koji SHIMAZAKI , Hironao SUZUKI
摘要： A wheel loader is provided that can reduce the traveling distance required for a raise and run operation, and reduce fuel consumption. A wheel loader 1 includes: an engine 3; a torque converter 41; a forward and reverse switch 62; a stepping amount sensor 610; an operation amount sensor 73; and a controller 5. The controller 5 determines whether a specific condition for specifying an operation of the lift arm 21 in an upper direction during forward travel of the vehicle body, on the basis of a forward and reverse switching signal, the stepping amount on the accelerator pedal 61, and a pilot pressure Ti pertaining to the lifting operation amount for the lift aim 21. When the specific condition is satisfied, the vehicle speed is limited by reducing the maximum rotational speed of the engine 3 in response to increase in the pilot pressure Ti.
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