公开(公告)号：US20240396481A1

公开(公告)日：2024-11-28

申请号：US18689527

申请日：2022-10-17

Applicant: Hitachi Construction Machinery Co., Ltd.

Inventor： Kosuke MATSUO ,  Satoru KANEKO ,  Masatoshi YOSHIMURA ,  Kazuo NISHIHAMA ,  Seiji ISHIDA ,  Toshihiko WATANABLE ,  Tokuma IKEGAMI

IPC: H02P21/09 ,  B60L15/00 ,  H02P21/22 ,  H02P101/45 ,  H02P103/10

Abstract: An object of the present invention is to provide an electric power generation system that can stably control, with one electric power converter, output electric power of a main winding and an auxiliary winding of a dual-winding induction electric power generator. For this purpose, in an electric power generation system including an electric power generator having a stator including a main winding and an auxiliary winding, a rectifier connected to the main winding, an electric power converter that is connected to the auxiliary winding and controls voltages of the main winding and the auxiliary winding, and a controller that outputs a control signal according to a voltage command value of the auxiliary winding to the electric power converter, the controller calculates a voltage change amount of the auxiliary winding generated by interference of a magnetic flux of the main winding with the auxiliary winding, on the basis of a current and the voltage of the main winding, and adds the voltage change amount to the voltage command value of the auxiliary winding.

公开(公告)号：US20230272598A1

公开(公告)日：2023-08-31

申请号：US18017424

申请日：2021-08-02

Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.

Inventor： Masatoshi YOSHIMURA ,  Hiroyuki KOBAYASHI ,  Satoru KANEKO ,  Noritaka ITOU ,  Satoshi SEKINO ,  Katsuhiko TOKUDA

IPC: E02F9/20 ,  E02F9/22 ,  F16H61/44 ,  F16H61/42 ,  F16H61/472

CPC classification number: E02F9/2075 ,  E02F9/2095 ,  E02F9/2221 ,  F16H61/44 ,  F16H61/42 ,  F16H61/472 ,  B60Y2200/415 ,  F16H59/14

Abstract: A work vehicle includes: an engine; a hydraulic pump that is driven by the engine; hydraulic cylinders that are extended and contracted by pressurized fluid delivered from the hydraulic pump; a work device that is moved according to the extension/contraction operations of the hydraulic cylinders; a travel device that is driven independently of the work device; an electrically driven motor that is driven by electric power generated by the engine to operate the travel device; and a controller that controls the hydraulic cylinders and the electrically driven motor. The controller controls the output power of the hydraulic pump and the output power of the electrically driven motor by changing the distribution ratios of a first torque consumed by the work device and a second torque consumed by the travel device among torques output by the engine, on the basis of a reaction force received by the vehicle body.

公开(公告)号：US20230313488A1

公开(公告)日：2023-10-05

申请号：US18021202

申请日：2022-02-18

Applicant: Hitachi Construction Machinery Co., Ltd.

Inventor： Masatoshi YOSHIMURA ,  Hiroyuki KOBAYASHI ,  Satoru KANEKO ,  Noritaka ITOU ,  Satoshi SEKINO

IPC: E02F3/43 ,  E02F9/20 ,  E02F9/22

CPC classification number: E02F3/434 ,  E02F9/2075 ,  E02F9/2079 ,  E02F9/2235

Abstract: The work vehicle 1 includes a main controller 100 that controls a travel driving force and a work driving force. The main controller 100 includes a travel remaining time calculating unit 111 that calculates a remaining time until a target rise/run distance is reached as a travel remaining time tC, a work remaining time calculating unit 112 that calculates a remaining time until a target arm angle is reached as a work remaining time t1, a rise/run determining unit 113 that determines whether rise/run is being performed or not, a correction rate setting unit 114 that sets a travel correction rate ηC that adjusts a travel driving torque and a work correction rate ηI that adjusts a work driving torque based on the travel remaining time tC, the work remaining time t1, and the rise/run determination flag, and an engine torque distribution calculating unit 115 that calculates a travel driving torque command and a work driving torque command based on the travel correction rate ηC and the work correction rate ηI.

公开(公告)号：US20230373320A1

公开(公告)日：2023-11-23

申请号：US18025002

申请日：2022-02-08

Applicant: Hitachi Construction Machinery Co., Ltd.

Inventor： Satoru KANEKO ,  Kazuo NISHIHAMA ,  Masatoshi YOSHIMURA ,  Kosuke MATSUO ,  Seiji ISHIDA ,  Toshihiko WATANABE ,  Tokuma IKEGAMI

IPC: B60L50/13 ,  B60L1/00

CPC classification number: B60L50/13 ,  B60L1/003 ,  B60L2200/44 ,  B60L2210/30 ,  B60L2210/40 ,  B60L2210/10 ,  B60L2240/12

Abstract: An object of the present invention is to provide a drive system for a dump truck capable of suppressing increase in size of a converter that controls a two-winding induction generator. To this end, the drive system for a dump truck includes a DC-DC converter connected to a main side DC bus and an auxiliary side DC bus, and a controller controls the DC-DC converter such that electric power of the main side DC bus is supplied to the auxiliary side DC bus via the DC-DC converter.

公开(公告)号：US20230253858A1

公开(公告)日：2023-08-10

申请号：US18012349

申请日：2021-05-20

Applicant: Hitachi Construction Machinery Co., Ltd.

Inventor： Kazuo NISHIHAMA ,  Masatoshi YOSHIMURA ,  Toshihiko WATANABE ,  Toshihiko ISHIDA ,  Seiji ISHIDA

IPC: H02K7/18 ,  H02K1/16 ,  H02K1/26 ,  H02K3/34 ,  H02P27/06

CPC classification number: H02K7/1807 ,  H02K1/16 ,  H02K1/26 ,  H02K3/34 ,  H02P27/06

Abstract: An object of the present invention is to provide a drive system that is provided with an induction generator having a primary winding including a main winding and an auxiliary winding and a secondary conductor, can vary the voltage of the main winding, and can increase the maximum output power of the auxiliary winding. Therefore, provided is a drive system, which is provided with an induction generator having a primary winding including a main winding and an auxiliary winding and a secondary conductor, including: a starting battery that starts the induction generator; a traction inverter that drives a traction motor; an auxiliary device inverter that drives an auxiliary device motor; a rectifier the input side of which is connected to the main winding and the output side of which is connected to the traction inverter; and a power generation inverter the output side of which is connected to the auxiliary winding and the input side of which is connected to the auxiliary device inverter and the starting battery.

公开(公告)号：US20230370008A1

公开(公告)日：2023-11-16

申请号：US18025492

申请日：2022-02-18

Applicant: Hitachi Construction Machinery Co., Ltd.

Inventor： Kazuo NISHIHAMA ,  Masatoshi YOSHIMURA ,  Kosuke MATSUO ,  Satoru KANEKO ,  Tokuma IKEGAMI ,  Seiji ISHIDA ,  Toshihiko WATANABE

IPC: H02P27/06 ,  H02K11/33 ,  B60L15/00 ,  B60L50/51 ,  B60L7/14

CPC classification number: H02P27/06 ,  H02K11/33 ,  B60L15/007 ,  B60L50/51 ,  B60L7/14

Abstract: It is an object of the present invention to provide a drive system including an induction generator comprising some primary windings that has a main winding and an auxiliary winding, the drive system being capable of supplying electric power required by an auxiliary inverter, even in a regenerative mode of operation in which only the auxiliary winding is energized. The maximum current value of a converter for power generating is set on the basis of the maximum output power of the auxiliary winding of the induction generator and the minimum voltage applied to the auxiliary winding unless a traction inverter is in a regenerative mode of operation, and the non-load current value of the induction generator is set such that the maximum current in the auxiliary winding under the situation of the traction inverter being in the regenerative mode of operation does not exceed the maximum current in the converter for power generating.