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公开(公告)号：EP3306134B1
公开(公告)日：2020-02-05
申请号：EP16802862.9
申请日：2016-03-01
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公开(公告)号：EP3139361B1
公开(公告)日：2020-01-29
申请号：EP15786571.8
申请日：2015-03-04
发明人： ONO Yukihiko , WATANABE Atsushi , ISHIMOTO Hidefumi , FUJITA Koji
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公开(公告)号：EP3594701A1
公开(公告)日：2020-01-15
申请号：EP17899530.4
申请日：2017-11-23
发明人： ISHIDA Toshihiko
摘要： A dump truck (1) is provided with a ground fault detection device (22) that detects a ground fault detection voltage V0 as a difference between a detection voltage Vp between a positive electrode line (18A) of a DC bus (18) and a neutral point N and a detection voltage Vn between the neutral point N and a negative electrode line (18B) of the DC bus (18) and detects a ground fault based upon the ground fault detection voltage V0. The ground fault detection device (22) includes a DC component determining section (25) that extracts a DC component V Ldc from the ground fault detection voltage V0 and determines a ground fault based upon the DC component V Ldc , and a drive frequency component determining sections (26), (27) that extract drive frequency components V LiR , V LiL of the inverters (17R), (17L) from the ground fault detection voltage V0 and determine a ground fault based upon the drive frequency components V LiR , V LiL .
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公开(公告)号：EP3591241A1
公开(公告)日：2020-01-08
申请号：EP18908807.3
申请日：2018-03-08
发明人： HIJIKATA Seiji , ISHIKAWA Kouji , IMURA Shinya
摘要： Provided is a work machine capable of regenerating a return hydraulic fluid from a hydraulic actuator while preventing a drag loss of a regeneration hydraulic motor and a hydraulic pump from increasing and preventing the regeneration efficiency of the regeneration hydraulic motor from decreasing. A controller 100 computes a required regeneration hydraulic motor revolution speed from a displacement of a regeneration hydraulic motor 13 and a regeneration flow rate of the regeneration hydraulic motor, computes a required first hydraulic pump revolution speed from a displacement of a first hydraulic pump 15 and a target assist flow rate of the first hydraulic pump, and selects a greater one of the required regeneration hydraulic motor revolution speed and the required first hydraulic pump revolution speed as a target revolution speed of an electric motor 14.
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公开(公告)号：EP3581810A1
公开(公告)日：2019-12-18
申请号：EP18854003.3
申请日：2018-05-18
摘要： A controller (45) is provided with an elapse time measuring section (47A) that measures an elapse time (tx) elapsed since an initial use of an accumulator (29) based upon a reset signal from a reset switch (44), a number-of-operations measuring section (47B) that measures a number of operations of the accumulator (29), that is, a number (N) of boom lowering operations after a reset, based upon a detection signal from an accumulator side pressure sensor (39), a gas permeation amount estimating section (47C) that estimates an estimation gas permeation amount (Qloss) of the accumulator (29), a sealed gas pressure estimating section (47D) that finds an estimation sealed gas pressure (Pgs) of a gas chamber (29B) of the accumulator (29), and an accumulator degradation determining section (47E) that determines a degradation condition of the accumulator (29) and outputs the determination result.
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公开(公告)号：EP3578409A1
公开(公告)日：2019-12-11
申请号：EP18906888.5
申请日：2018-02-23
IPC分类号： B60L7/14
摘要： To provide a power regeneration system for a working vehicle that can effectively use a regenerative electric energy.
A first electric circuit for supplying an electric power generated by the first generator to a traveling motor, a voltage detector for detecting an actual voltage of the first electric circuit, a second electric circuit for supplying an electric power generated by a second generator to an auxiliary device, a step-down device connected to the first electric circuit and the second electric circuit, and a controller are provided. The controller estimates the voltage of the first electric circuit after a predetermined time has elapsed from the present time, based on information on a traveling state of a work vehicle and the actual voltage detected by the voltage detector, and outputs a drive command to the step-down devie when the estimated voltage is equal to or more than a threshold.-
公开(公告)号：EP3026272B1
公开(公告)日：2019-09-11
申请号：EP14829246.9
申请日：2014-07-24
发明人： OOKI, Takatoshi , HIJIKATA, Seiji
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公开(公告)号：EP2657536B1
公开(公告)日：2019-09-11
申请号：EP11850636.9
申请日：2011-12-07
IPC分类号： F15B11/028 , E02F9/22 , F15B19/00
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公开(公告)号：EP3524482A1
公开(公告)日：2019-08-14
申请号：EP16913634.8
申请日：2016-09-29
发明人： NISHIKAWA Shinji , IMURA Shinya , HITA Masafumi , AMANO Hiroaki
摘要： It becomes possible to prevent deterioration of an electric storage device due to overdischarge of the electric storage device and engine stalling due to insufficient assist or disabled assist when a charge amount of the electric storage device falls, ensure that work is continuously conducted, suppress an operator from feeling discomfort in operation, and ensure favorable operability. A pump target output power computing section (21) computes present pump demanded power on the basis of work related information, limits the present pump demanded power in response to a degree of reduction of a state of charge of an electric storage device (12a) when the state of charge is lower than a preset threshold, and computes the limited present pump demanded power as present pump target output power. A pump flow rate limiting command value computing section (22) computes a pump flow rate limiting command value on the basis of the present pump target output power in such a manner that output power of a hydraulic pump (9) does not exceed the pump target output power.
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公开(公告)号：EP3521638A1
公开(公告)日：2019-08-07
申请号：EP16913638.9
申请日：2016-09-29
IPC分类号： F15B21/14
摘要： It is an object of the present invention to provide a hydraulic drive system that effectively utilizes a hydraulic fluid accumulated in an accumulator to make it possible to achieve a substantial improvement in terms of efficiency for a work machine as a whole. A hydraulic drive system includes: a first hydraulic pump; a first hydraulic actuator driven by being supplied with a hydraulic fluid from the first hydraulic pump; a first line for supplying the hydraulic fluid from the first hydraulic pump to the first hydraulic actuator; a first pump flow adjustment device installed in the first line, the first pump flow adjustment device being configured to adjust; a first hydraulic accumulator for accumulating the hydraulic fluid delivered from the first hydraulic pump; and a first accumulation flow adjustment device configured to adjust the flow of the hydraulic fluid from the first hydraulic pump to the first hydraulic accumulator. The hydraulic drive system further comprises a first accumulation flow supply device configured to supply the hydraulic fluid accumulated in the first hydraulic accumulator to the first hydraulic actuator via a second line different from the first line.
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