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公开(公告)号：US11554760B2
公开(公告)日：2023-01-17
申请号：US16490249
申请日：2018-07-27
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).
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公开(公告)号：US11124166B2
公开(公告)日：2021-09-21
申请号：US16330379
申请日：2017-09-26
摘要： A hydraulic oil resupply device (40) is provided between first accumulators (15F, 15R) in a manual braking operation circuit (11) and a second accumulator (25) in an automatic brake circuit (24). The hydraulic oil resupply device (40) resupplies hydraulic oil accumulated in the second accumulator (25) to the first accumulators (15F, 15R) at the operating of a manual braking operation by an operator. This configuration can suppress a rising speed of a brake pressure at the manual operation braking from being slow. Accordingly, in a vehicular brake system, it is possible to enhance a braking capability by the manual braking operation and improve the reliability.
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公开(公告)号：US10583743B2
公开(公告)日：2020-03-10
申请号：US15764556
申请日：2016-09-08
发明人： Tomonori Takada , Takanobu Ikari , Takashi Ikimi , Akihiro Nakamura , Masatsugu Arai , Naoki Fukuda , Takaaki Tanaka
IPC分类号： B60L7/06 , B60K11/06 , H02P3/22 , B60L1/02 , B60L1/00 , B60W30/18 , B60K6/46 , B60K7/00 , H02M3/335 , H02P3/18 , H02P5/74 , B60K1/00 , B60P1/04
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.
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公开(公告)号：US11987115B2
公开(公告)日：2024-05-21
申请号：US17634585
申请日：2020-02-19
发明人： Kazunori Ishihara , Jun Ikeda , Takaaki Tanaka , Yoshifumi Nabeshima , Hideaki Iijima , Tsukasa Akiyama
CPC分类号： B60K11/04 , B60K11/06 , F01P2003/182
摘要： Provided is a technique for improving the cooling efficiency of a vehicle heat exchange system configured to cool a cooling liquid discharged from each of a plurality of heat sources. The vehicle heat exchange system comprises a high-temperature side radiator unit and a low-temperature side radiator unit, the high-temperature side radiator including: a first high-temperature side radiator that faces a first fan and is connected to a high-temperature side discharge pipe; a second high-temperature side radiator that faces a second fan and is connected to a high-temperature side supply pipe; and a high-temperature side connection pipe for supplying the cooling liquid from the first high-temperature side radiator to the second high-temperature side radiator, and the low-temperature side radiator unit including: a first low-temperature side radiator that is arranged to face the second high-temperature side radiator on the upstream side of the cooling air flow, and is connected to a low-temperature side discharge pipe; a second low-temperature side radiator that is arranged to face the first high-temperature side radiator on the upstream side of the cooling air flow, and is connected to a low-temperature side supply pipe; and a low-temperature side connection pipe for supplying the cooling liquid from the first low-temperature side radiator to the second low-temperature side radiator.
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公开(公告)号：US11649816B2
公开(公告)日：2023-05-16
申请号：US17597043
申请日：2019-11-08
发明人： Takaaki Tanaka , Kazunori Ishihara , Jun Ikeda , Juri Shimizu
CPC分类号： F04B49/06 , E02F9/226 , E02F9/2296 , E02F9/2235 , F04B49/08 , F04B2203/0209 , F04B2205/05
摘要： An engine (12) drives a variable capacity-type hydraulic pump (16), discharged hydraulic oil is selectively supplied to a cooling fan (19) and a hoist cylinder (11) in accordance with switching of a selection valve (17), thereby controlling the same on the basis of each target value. A pump discharge pressure (Pp) of the hydraulic oil discharged from the hydraulic pump (16) and a motor supply pressure (Pm) of the hydraulic oil supplied to a hydraulic motor (18) via the selection valve (17) are detected by sensors (27, 28) and are compared with pressure determination values stored in advance as a pump discharge pressure (Pp) and an actuator supply pressure (Pm) generated when the target value is achieved. Presence/absence of abnormality in the hydraulic actuator control device (15) is determined on the basis of a result of the comparison, and when abnormality is determined to have occurred, control is performed to minimize the capacity of the hydraulic pump (16).
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公开(公告)号：US11332115B2
公开(公告)日：2022-05-17
申请号：US16631587
申请日：2018-06-04
摘要： A power regeneration system of a work vehicle includes: a first generator (12) and a second generator (31) that are driven by an engine (11); a first electric circuit (C1) for supplying electric power to traveling motors (10L, 10R); a second electric circuit (C2) for supplying electric power to an auxiliary device (35); a voltage step down converter (21) providing electric power from the first electric circuit to the second electric circuit; and a controller (51) that determines whether a travel mode of the work vehicle is a powering mode or a regeneration mode in order to control driving of the voltage step down converter. If the travel mode is the regeneration mode, the controller provides the regenerative power from the first electric circuit through the voltage step down converter to the second electric circuit, in order to drive the auxiliary device with the regenerative power.
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公开(公告)号：US11173890B2
公开(公告)日：2021-11-16
申请号：US16490986
申请日：2018-02-23
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 device when the estimated voltage is equal to or more than a threshold.-
公开(公告)号：US11104316B2
公开(公告)日：2021-08-31
申请号：US16329390
申请日：2018-03-05
发明人： Takayuki Sato , Takaaki Tanaka , Hidefumi Ishimoto
摘要： An autonomous traveling vehicle, equipped with autonomous traveling function on a standard machine, has a high-pressure selector valve placed on a flow path in which pressure-oil is supplied from a standard brake valve (SBV) installed in the standard machine to a hydraulic brake. A flow path is installed to connect the high-pressure selector valve and an autonomous brake control valve (ABCV) that is supplied with pressure-oil delivered by a hydraulic pump. Further, an autonomous traveling controller is installed to perform control for autonomous travel, and an autonomous brake controller is installed to perform open or close control on the ABCV in response to a braking instruction from the autonomous traveling controller. When the brake pedal is stepped on, the pressure-oil flows from the SBV to the hydraulic brake, and when the autonomous traveling controller outputs a stop instruction, the pressure-oil flows from the ABCV to the hydraulic brake.
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公开(公告)号：US10107341B2
公开(公告)日：2018-10-23
申请号：US15451455
申请日：2017-03-07
发明人： Naoki Fukuda , Tadashi Osaka , Ryuji Kouno , Masatsugu Arai , Takanobu Ikari , Takaaki Tanaka
IPC分类号： F16D48/06
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.
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