公开(公告)号：US20200010060A1

公开(公告)日：2020-01-09

申请号：US16490249

申请日：2018-07-27

申请人： HITACHI CONSTRUCTION MACHINERY CO., LTD.

发明人： Takaaki TANAKA ,  Takanobu IKARI ,  Yasutaka TSURUGA ,  Takayuki SATO ,  Takashi SASAKI

IPC分类号： B60T7/16 ,  B60T13/14 ,  B60T13/68 ,  B60T17/18 ,  F15B20/00

摘要： An automatic brake subsystem (24) includes second accumulators (25F, 25R), a front second line (28) and a rear second line (29), second brake valves (30F, 30R), a first solenoid switching valve (32), first shuttle valves (33F, 33R), and a controller 37. A second solenoid switching valve (34F) and a pressure sensor (35F) are provided in the front second line (28), and a second solenoid switching valve (34R) and a pressure sensor (35R) are provided in the rear second line (29). In a case where it is determined that each of the second brake valve (30F, 30R) is not performing normally based upon a pressure of a hydraulic fluid detected by each of the pressure sensors (35F, 35R) and an operating signal supplied to the first solenoid switching valve (32) or each of the second brake valves (30F, 30R), a controller 37 performs control to switch each of the second solenoid switching valves (34F, 34R).

公开(公告)号：US20180272871A1

公开(公告)日：2018-09-27

申请号：US15764556

申请日：2016-09-08

申请人： HITACHI CONSTRUCTION MACHINERY CO., LTD.

发明人： Tomonori TAKADA ,  Takanobu IKARI ,  Takashi IKIMI ,  Akihiro NAKAMURA ,  Masatsugu ARAI ,  Naoki FUKUDA ,  Takaaki TANAKA

IPC分类号： B60L7/06 ,  B60K6/46 ,  B60K11/06 ,  H02M3/335 ,  H02P5/74 ,  H02P3/18

摘要： In a regenerative braking device of a dump truck comprising an engine, a first generator and a second generator driven by the engine, at least one travel motor driven by generated electric power of the first generator and at least one fan motor to which generated electric power of the second generator is inputted via a first rectifier circuit, the regenerative braking device comprises: a resistive element to which regenerating electric power from the at least one travel motor in regenerative braking is supplied and which is cooled by at least one fan driven by the at least one fan motor and converts electric energy into heat energy and dissipates heat; and a DC/DC converter that inputs a part of the regenerating electric power which is supplied to the resistive element to an output line of the first rectifier circuit via a second rectifier circuit.

公开(公告)号：US20180087587A1

公开(公告)日：2018-03-29

申请号：US15451455

申请日：2017-03-07

申请人： Hitachi Construction Machinery Co., Ltd.

发明人： Naoki FUKUDA ,  Tadashi OSAKA ,  Ryuji KOUNO ,  Masatsugu ARAI ,  Takanobu IKARI ,  Takaaki TANAKA

IPC分类号： F16D48/06

CPC分类号： F16D48/06 ,  F16D2500/30426 ,  F16D2500/3056 ,  F16D2500/3067 ,  F16D2500/70442 ,  F16D2500/70446 ,  F16D2500/7061 ,  F16D2500/7101

摘要： Provided is a clutch control device for a work machine capable of controlling a fan to an appropriate rotational speed. In the clutch control device for the work machine, a controller includes a target fan rotational speed calculation module that calculates a target fan rotational speed for the fan, a clutch characteristic curve storage module that stores a plurality of clutch characteristic curves, a clutch command calculation module that outputs with reference to a clutch characteristic curve a first clutch control signal corresponding to the target fan rotational speed, a feedback control module that output a second clutch control signal based on the difference between the target fan rotational speed and an actual fan rotational speed, and an adder that adds the first clutch control signal and the second clutch control signal to output a third clutch control signal.