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公开(公告)号：US11946492B2
公开(公告)日：2024-04-02
申请号：US17910521
申请日：2021-07-13
IPC分类号： F15B11/042 , E02F9/20 , E02F9/22 , F15B21/08 , E02F3/43
CPC分类号： F15B11/0423 , E02F9/2004 , E02F9/2228 , E02F9/2282 , E02F9/2296 , F15B21/082 , F15B21/087 , E02F3/435 , E02F9/2285 , F15B2211/329
摘要： A work machine includes: a hydraulic actuator that is driven by a hydraulic fluid from a hydraulic pump; an open-center directional control valve that is arranged on a center bypass line, and controls a flow of the hydraulic fluid to be supplied to the hydraulic actuator; a CB cut valve arranged between a directional control valve and a hydraulic working fluid tank on the center bypass line; and a machine controller that controls an opening of the CB cut valve. The machine controller restricts the opening of the CB cut valve when operation on the hydraulic actuator is in a fine operation state in which the operation on the hydraulic actuator is within a predetermined range representing a region of fine operation, and the fine operation state is continued longer than a predetermined period, and fully opens the CB cut valve otherwise.
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公开(公告)号：US11377822B2
公开(公告)日：2022-07-05
申请号：US16330407
申请日：2017-09-08
IPC分类号： E02F9/22
摘要： A first torque control proportional electromagnetic valve (37) is connected through a first torque control line (41) to a third pressure receiving chamber (32D) in a first torque control regulator (32). A second torque control proportional electromagnetic valve (38) is connected through a second torque control line (42) to a third pressure receiving chamber (35D) in a second torque control regulator (35). The first and second torque control proportional electromagnetic valves (37, 38) are controlled by a controller 47. A switching valve (48) is provided between the first torque control line (41) and the second torque control line (42). The switching valve (48) supplies an output pressure of the first torque control proportional electromagnetic valve (37) to the third pressure receiving chamber (35D) in the second torque control regulator (35) at the time of driving hydraulic motors (2B, 2C) for left side and right side traveling.
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公开(公告)号：US10794044B2
公开(公告)日：2020-10-06
申请号：US16082748
申请日：2017-03-27
发明人： Yuichi Ogawa , Seiji Hijikata , Masatoshi Hoshino
摘要： Provided is a work machine hydraulic control system capable of detecting abnormality in a pump output power switching device independently of the abnormality state of the pump output power switching device. A hydraulic control system of a hydraulic excavator is equipped with an accumulator 21 connected to a hydraulic line 25A between a pilot pump 17 and a pilot valve 20, an unloading valve 27 that is a pump output power switching device, a pressure sensor 29 detecting the pressure of the hydraulic fluid supplied to the pilot valve 20, and a controller 30 having a pump output power control section 31 switching the unloading valve 27 in accordance with the pressure detected by the pressure sensor 29. The controller 30 further has an abnormality determination section 32 that computes a command continuation time in a state in which a command output to the unloading valve 27 is not changed. In the case where this command continuation time is not less than a predetermined value, it determines that the unloading valve 27 is abnormal, and outputs the determination result.
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公开(公告)号：US10480442B2
公开(公告)日：2019-11-19
申请号：US16218597
申请日：2018-12-13
IPC分类号： F02D41/22 , F02D41/00 , F02D41/04 , F02D41/26 , F02D29/04 , F02D29/02 , G07C5/00 , G07C5/08 , E02F9/26 , E02F9/20 , E02F3/32
摘要： An object of the present invention is to provide a working machine and a working machine monitoring system using the same which is capable of improving the accuracy in determining fuel property. The working machine is provided with an engine operation parameter acquisition module (1041) that acquires an engine operation parameter representing the operation state of an engine mounted on the working machine; a refueling time acquisition module (1011) that acquires a refueling time when the working machine is supplied with fuel; and a fuel property determination module (1014) that determines the property of the fuel based on a comparison result of the time when the engine operation parameter changes, with the refueling time.
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公开(公告)号：US09816252B2
公开(公告)日：2017-11-14
申请号：US14411246
申请日：2013-05-10
IPC分类号： E02F9/20 , F02D29/02 , F02D29/04 , E02F9/22 , B60K6/485 , B60W10/06 , B60W10/08 , B60W10/30 , B60W20/00
CPC分类号： E02F9/2075 , B60K6/485 , B60W10/06 , B60W10/08 , B60W10/30 , B60W20/00 , B60W2300/17 , E02F9/2246 , E02F9/2296 , F02D29/02 , F02D29/04 , Y02T10/6226 , Y02T10/6286
摘要： This invention is a hydraulic work machine having an electric assist motor coupled to an engine and a hydraulic pump, in the hydraulic work machine of which, a rotational speed and torque of the engine are controlled so that an operating point of the engine moves along a predetermined route for yielding a combustion state of the engine under a transient state that the engine changes in speed and torque. A target speed and torque of the engine 7 are set so that the rotational speed and torque of the engine 7 will change along a predetermined route F in a running region of the engine, respective rates of change of the target rotational speed and torque of the engine 7 are limited, and the engine 7 is controlled to yield the target engine speed. In addition, torque of the assist motor 10 is controlled to yield the target torque of the engine.
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公开(公告)号：US09671763B2
公开(公告)日：2017-06-06
申请号：US14370127
申请日：2012-12-28
IPC分类号： G05B11/01 , B60K6/485 , B60W10/06 , B60W20/00 , F04B49/06 , B60W10/30 , B60W30/188 , G05B15/02 , F02D29/04 , F02D29/06
CPC分类号： G05B11/01 , B60K6/485 , B60W10/06 , B60W10/30 , B60W20/00 , B60W30/1882 , F02D29/04 , F02D29/06 , F04B49/06 , G05B15/02 , Y02T10/6226
摘要： In a control device for construction machinery, a system operating point calculation unit calculates a plurality of combinations of engine rotational speed and engine torque with which demanded power of an engine can be generated; and calculates system efficiency in each of the combinations according to discharge pressure of a hydraulic. A rotational speed calculation unit calculates target rotational speed of the engine as the engine rotational speed in one of the combinations of the engine rotational speed, the engine torque and the system efficiency calculated by the system operating point calculation unit that includes desired system efficiency. A displacement calculation unit calculates target displacement of the hydraulic pump based on the target rotational speed calculated by the rotational speed calculation unit and demanded flow rate of the hydraulic pump. With this control device, the engine and the hydraulic pump can be controlled at an efficient operating point.
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公开(公告)号：US09187294B2
公开(公告)日：2015-11-17
申请号：US14351406
申请日：2012-10-12
CPC分类号： B66C13/18 , B60K6/46 , B60K6/485 , B66C23/84 , E02F9/123 , E02F9/20 , E02F9/2075 , E02F9/2091 , E02F9/2095 , Y02T10/6217 , Y02T10/6226
摘要： Provided is a hybrid construction machine together with a method for controlling that construction machine in a manner ensuring the operability of its combined operations regardless of fluctuations in the load on its work machine.The hybrid construction machine has: a swing structure; a work machine attached to the swing structure; an engine mounted on the swing structure; a first electric motor driven by the engine, the motor being capable of generating power; a hydraulic pump driven by the engine and the first electric motor; a second electric motor for driving the swing structure; and a plurality of electric storage devices, wherein the hybrid construction machine further includes a first control unit which, in a combined operation involving the work machine and the swing structure, drives and controls the second electric motor by use of the electric power supplied from at least one electric storage device selected from the storage devices and from another electric storage device offering a higher output level and a lower stored energy level per unit weight than the selected at least one electric storage device, and drives and controls the hydraulic pump by use of the engine.
摘要翻译： 提供了一种混合式施工机器以及用于以确保其组合操作的可操作性的方式控制该建筑机器的方法，而不管其作业机器上的负载的波动如何。 混合动力施工机械有：摆动结构; 连接到摆动结构的作业机器; 安装在摆动结构上的发动机; 由发动机驱动的第一电动马达，能够发电; 由发动机和第一电动机驱动的液压泵; 用于驱动所述摆动结构的第二电动机; 以及多个蓄电装置，其中，所述混合动力施工机械还包括第一控制单元，所述第一控制单元在涉及所述作业机械和所述摆动结构的组合操作中，通过使用从其提供的电力来驱动和控制所述第二电动机 从所述存储装置中选择的至少一个蓄电装置以及从所选择的至少一个蓄电装置提供更高输出水平和每单位重量的较低存储能量水平的另一蓄电装置，并且通过使用所述至少一个蓄电装置来驱动和控制所述液压泵 引擎。
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公开(公告)号：US20150047916A1
公开(公告)日：2015-02-19
申请号：US14377566
申请日：2013-02-13
CPC分类号： E02F9/2075 , B60K6/46 , B60K6/52 , B60L7/14 , B60L7/18 , B60L11/005 , B60L11/123 , B60L11/126 , B60L11/14 , B60L15/20 , B60L15/2009 , B60L2200/40 , B60L2200/42 , B60L2210/30 , B60L2210/40 , B60L2240/421 , B60L2240/423 , B60L2240/526 , B60L2240/527 , B60L2240/529 , B60L2240/547 , B60L2250/26 , B60W10/06 , B60W10/08 , B60W20/00 , B60W30/18045 , B60W2300/17 , B60W2510/244 , E02F9/207 , E02F9/2079 , E02F9/2083 , E02F9/2091 , E02F9/2095 , E02F9/2296 , Y02T10/6217 , Y02T10/6265 , Y02T10/6286 , Y02T10/642 , Y02T10/645 , Y02T10/7022 , Y02T10/7077 , Y02T10/7241 , Y02T10/7275 , Y02T10/92 , Y10S903/903
摘要： There is provided an electrically driven working vehicle that needs reduced assisting power from an electrical storage device when accelerating subsequent to modulation and still obtains acceleration at least equivalent to that of torque converter vehicles.The electrically driven working vehicle has an engine 1, a generator motor 5 connected mechanically to the engine 1, a generator inverter 6 for controlling the amount of power generated by the generator motor 5, a traveling motor 7 for driving a vehicle body, an electrical storage device 3 connected electrically to the generator inverter 6 and to the traveling motor 7, and a forward/reverse switching device 103 for switching the traveling direction of the vehicle body. The vehicle includes a control device 100 for outputting to the generator inverter 6 an instruction to increase the amount of power generated by the generator motor 5 when the voltage of the electrical storage device 3 is equal to or lower than a maximum voltage level and a speed signal of the traveling motor 7 given upon switching of the forward/reverse switching device 103 is equal to or lower than a predetermined speed.
摘要翻译： 提供了一种电动作业车辆，其在调制后加速时需要减少来自蓄电装置的辅助动力，并且还获得至少与变矩器车辆相当的加速度。 电动作业车辆具有发动机1，与发动机1机械连接的发电电动机5，用于控制发电电动机5产生的动力量的发电机逆变器6，车体驱动用行驶电动机7， 与发电机逆变器6和行驶电动机7电连接的蓄电装置3，以及用于切换车身行驶方向的前后倒转开关装置103。 车辆包括控制装置100，用于当蓄电装置3的电压等于或低于最大电压电平和速度时，向发电机逆变器6输出增加发电电动机5产生的电力量的指令 正向/反向切换装置103切换时给出的行进马达7的信号等于或低于预定速度。
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公开(公告)号：US12054918B2
公开(公告)日：2024-08-06
申请号：US17908956
申请日：2021-10-18
CPC分类号： E02F9/2228 , E02F9/2004 , E02F9/2203 , E02F9/2217 , E02F9/2246 , F15B1/04 , F15B13/02 , E02F9/2282 , F15B21/087 , F15B21/14 , F15B2211/20523 , F15B2211/20546 , F15B2211/30565 , F15B2211/426 , F15B2211/6346 , F15B2211/6651 , F15B2211/7053 , F15B2211/88
摘要： The present invention provides a construction machine equipped with a pressure accumulation device that accumulates return oil from an actuator, and that can implement both improvement in fuel efficiency with enhancement in workability. To achieve the foregoing, a controller sets an actuator upper limit output power that is an upper limit for an output power of the actuator according to a work mode selected by a work mode selection device, and controls a first control valve and a second control valve such that a sum of an output power of a hydraulic pump and an output power of the pressure accumulation device does not exceed the actuator upper limit output power.
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公开(公告)号：US12049744B2
公开(公告)日：2024-07-30
申请号：US18272121
申请日：2022-01-19
CPC分类号： E02F9/2217 , E02F9/123 , E02F9/2228 , F15B1/024 , F15B2211/212 , F15B2211/625
摘要： A work machine includes a hydraulic pump that is driven by an engine and delivers a pressurized fluid, a hydraulic actuator that is operated by the pressurized fluid delivered by the hydraulic pump, a hydraulic accumulator device that accumulates the pressurized fluid discharged from the hydraulic actuator, a differential pressure control valve that is disposed between the hydraulic actuator and the hydraulic accumulator device and generates a differential pressure across the differential pressure control valve between a pressure of the hydraulic actuator and a pressure of the hydraulic accumulator device, a pressure sensor that senses the pressure of the hydraulic accumulator device, and a controller that controls the differential pressure control valve on the basis of a sensing result of the pressure sensor. The controller controls the differential pressure control valve in such a manner that the differential pressure across the differential pressure control valve reduces according to a rise in the pressure of the hydraulic accumulator device sensed by the pressure sensor.
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