公开(公告)号：US11261578B2

公开(公告)日：2022-03-01

申请号：US16330410

申请日：2017-11-15

Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.

Inventor： Toshihiko Ishida ,  Manabu Edamura ,  Hidekazu Moriki

IPC: E02F3/43 ,  E02F9/20 ,  E02F9/22 ,  E02F9/26

Abstract: A hydraulic excavator (1) provided with a controller (40) having a machine control section (43) that executes machine control for moving a work implement (1A) following a predetermined condition at the time of operation of operation devices (45a, 45b, and 46c) includes a level-of-intervention input device (96) that is operated by an operator. The controller includes a correction amount calculating section (43m) that calculates a correction amount of a level of intervention indicating a degree of intervention by the machine control in an operation of the work implement instructed through operation of the operation devices, based on an operation amount of the level-of-intervention input device. The machine control section executes the machine control to intervene in the operation of the work implement instructed through the operation of the operation devices at a level of intervention corrected based on the correction amount calculated at the correction amount calculating section.

公开(公告)号：US10967744B2

公开(公告)日：2021-04-06

申请号：US16330398

申请日：2017-11-23

Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.

Inventor： Toshihiko Ishida

IPC: B60L50/15 ,  G01R31/52 ,  B60L3/00 ,  B60P1/04

Abstract: A dump truck is provided with a ground fault detection device that detects a ground fault detection voltage V0 as a difference between a detection voltage Vp between a positive electrode line of a DC bus and a neutral point N and a detection voltage Vn between the neutral point N and a negative electrode line of the DC bus and detects a ground fault based upon the ground fault detection voltage V0. The ground fault detection device includes a DC component determining section that extracts a DC component VLdc from the ground fault detection voltage V0 and determines a ground fault based upon the DC component VLdc, and a drive frequency component determining sections (that extract drive frequency components VLiR, VLiL of the inverters from the ground fault detection voltage V0 and determine a ground fault based upon the drive frequency components VLiR, VLiL.

公开(公告)号：US12224650B2

公开(公告)日：2025-02-11

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

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：US09828749B2

公开(公告)日：2017-11-28

申请号：US14915736

申请日：2015-02-27

Applicant: Hitachi Construction Machinery Co., Ltd.

Inventor： Tomonori Takada ,  Shigeyuki Yoshihara ,  Toshihiko Ishida ,  Nobuyoshi Takahashi ,  Naoya Kawakami

IPC: E02F9/26 ,  B60L3/00 ,  E02F9/20

CPC classification number: E02F9/268 ,  B60L3/003 ,  B60L3/0061 ,  B60L11/08 ,  B60L11/123 ,  B60L2240/421 ,  B60L2240/423 ,  B60L2240/427 ,  B60L2240/429 ,  B60L2240/441 ,  B60L2240/527 ,  B60L2240/529 ,  E02F9/2075 ,  Y02T10/6217 ,  Y02T10/642 ,  Y02T10/7077

Abstract: To provide a hybrid wheel loader capable of reliably detecting a short-circuited state of a synchronous generator driven by a drive source. The present invention is provided with an MG 4 being a synchronous generator driven as an electric generator by an engine and operated as a motor by the electric power supplied from an electrical storage device 9, an MG inverter 5 having a motor current sensor 5d for detecting motor current flowing through the MG 4 and semiconductor switches 5a, 5b, and an HCU 10 for detecting a short-circuited state of the MG 4, wherein the HCU 10 determines that the MG 4 is in a short-circuited state when the semiconductor switches 5a, 5b of the MG inverter 5 are in an OFF state at gates and when the motor current detected by the motor current sensor 5d is equal to or greater than a specified threshold value.