Hitachi Construction Machinery Co., Ltd.

Hitachi, Ltd.

Other

Hitachi Industrial Equipment Systems Co., Ltd.

Kabushiki Kaisha Kobe Seiko Sho

Hitachi Automotive Systems, Ltd.

Hitachi Mito Engineering Co., Ltd.

Seiji Ishida

Shinya Imura

Ken Takeuchi

Hidetoshi Satake

Toshiaki Okuyama

Yusuke Kajita

Manabu Edamura

Hiroshi Fujii

Takatoshi Ooki

Masafumi Hita

Hiroyuki Tomita

Tsunehiro Endo

Kazuo Fujishima

Masatoshi Yoshimura

Kouji Ishikawa

Kinya Nakatsu

Satoru Kaneko

Kiyoshi Nakata

Tetsuo Kojima

Ryoso Masaki

Yutaka Sato

Osamu Suzuki

Masahiro Hiraga

Masatoshi Hoshino

Shiho Izumi

Shiro Yamaoka

Keijiro Sakai

Atsuhiko Nakamura

Hironori Ohashi

Mutsumi Kikuchi

Takashi Kuriyama

Sanshiro Obara

Satoshi Kikuchi

Katsumi Ishikawa

Takashi Ikimi

Shinji Ishihara

Hiroshi Arita

Tadashi Osaka

Masahiro Nagasu

Hiroaki Amano

Takashi Okada

Akira Horie

Eiichi Toyota

Takashi Kaneko

Masataka Sasaki

Yuusuke Takamoto

Motomi Shimada

Yuhachi Takakura

Takeshi Sako

Shuko Yamauchi

Kento Mochizuki

Yosuke Yasuda

Toshihiko Watanabe

Itaru Naya

Kazuo Nishihama

Mitsuo Sonoda

Junji Kato

Kosuke Matsuo

Tokuma Ikegami

Makoto Ishijima

Kenta Tanigaki

Kenji Nandoh

Tsutomu Miyoshi

Akira Nakayama

Itsuro Sawada

Toshihiko Ishida

Tatsuo Ando

Shinya Okumura

Masahiro Furukawa

Akira Watanabe

Teiichi Furukawa

Junji Yamamoto

Tsutomu Miyauchi

Satoru Okabe

Keijirou Sakai

Shigenori Aoki

Tadao Shimotsu

Chiaki Takahashi

Masayuki Tsugumi

Makoto Takase

Tomio Higo

Masaya Taniguchi

Hiroshi Maruyama

Takayoshi Nishino

Hideo Kimura

Masazumi Godo

Kunio Miura

Tetsuo Uchida

Masashi Izumi

Kazuhiro Yoshii

Hiroyuki Benya

He Bao

Shizuo Takahashi

Hisanori Shiraishi

Naoyuki Hasegawa

Tsuyoshi Sasaki

Yuki Makimura

Jun Kikuchi

Takashi Ogawa

A control device of an electric hydraulic excavator sets or computes a rotation speed command and an allowable torque of an electric motor on the basis of a required rotation speed of the electric motor, and a sum of a suppliable electric power of a converter and a battery suppliable electric power. An inverter of the electric hydraulic excavator sets the allowable torque to a torque command if a calculated torque of the electric motor computed by multiplying by a gain, a difference between the rotation speed command and a rotation speed of the electric motor, exceeds the allowable torque, and sets the calculated torque to the torque command if the calculated torque does not exceed the allowable torque. The inverter supplies the electric power that can generate a torque corresponding to the torque command to the electric motor.

Electric work machine

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.

Drive system for dump truck

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.

Drive system having an induction generator with a main winding and auxiliary winding

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.

Drive system

In a case of a normal operation, a battery controller () assumes a normal operation mode and permits charging and discharging of a battery module (). Upon receiving a discharge command from a vehicle body controller () for completely discharging the battery module (), the battery controller () assumes a discharge mode to discharge the battery module () to reach a safe voltage level and store discharge information. Upon reading out the discharge information, the battery controller () assumes a discharge prohibition mode to prohibit charging and discharging of the battery module ().

Construction machine

A low idling controller (A) switches an idling state flag from 'clear' to 'set' upon detecting a non-operation of an operating device (). A rotational speed controller (B) switches a rotational speed command from a set rotational speed by a rotational speed command device () to a low idling rotational speed based upon the idling state flag. At this time, an engine () drives in the low idling rotational speed lower than the set rotational speed. A gate controller () stops switching of an inverter () while the low idling controller (A) is lowering a rotational speed of the engine ().

A relay () connects and disconnects an electrical circuit to which an inverter () and an electricity storage device () are connected. A BCU () controls the electricity storage device (). An HC () controls an electric motor (), the inverter () and the BCU (). The HC () and the BCU () respectively have FET switches () for controlling supply and stop of the excitation current in the relay (). When the electricity storage device () is determined to be in an abnormal state, the BCU () transmits an abnormal signal to the HC (), and when a predetermined time has elapsed, turns off (opens) the first FET switch () of the BCU (). The HC () executes stop processing based upon the abnormal signal received from the BCU () and then turns off (opens) the second FET switch () of the HC ().

Electricity storage device controller, electric system and construction machine

A main controller and a hybrid controller control an engine, an assist generator motor, a hydraulic pump and an electricity storage device. In this case, the hybrid controller is provided with a performance state recovery part that performs performance state recovery of the electricity storage device. In a case where a performance state amount varying with repetition of a discharge and a charge of the electricity storage device, specifically, a current integrated value ratio of the electricity storage device goes beyond a predetermined threshold value (L1%), the performance state recovery part limits power of the hydraulic pump. Thereby, the performance state recovery part performs the performance state recovery of the electricity storage device.

A work machine includes: a satellite communication antenna for detecting a position of an upper swing structure; angle sensors detecting postures of two work devices; position computing devices that calculate postures/positions of the two work devices on the basis of outputs from the satellite communication antenna and the angle sensors; a display device on which the position of at least one work device of the two work devices and a position of a target surface are displayed; a display selection switch that outputs a first input signal for displaying a work device selected by an operator from between the two work devices on the display device; and a display changeover section that displays the work device corresponding to the first input signal input from the display selection switch out of the two work devices and the position of the target work object of the work device on the display device.

Work machine

Hybrid construction machinery has a power storage apparatus that can be warmed up quickly and has a lengthened life. The machinery includes an electric motor assisting a prime mover in power and generating electric power. The power storage apparatus transfers electric power to and from the electric motor. A warm-up circuit circulates a warming medium in the vicinity of the power storage apparatus, and a control device controls circulation of the warming medium. On-board equipment state detection units detect on-board equipment states to estimate an output request for the power storage apparatus from the on-board equipment. Circulation of the warming medium is controlled based on a temperature of the power storage apparatus and a determination temperature for determining whether to circulate the warming medium in the warm-up circuit. The control device further varies the determination temperature according to a result of detection by the on-board equipment state detection units.

Hybrid construction machinery

A motor generator () is connected mechanically to an engine () and a hydraulic pump (). The hydraulic pump () delivers pressurized oil to cylinders (D) to (F) in a working mechanism (), a traveling hydraulic motor () and a revolving hydraulic motor (). The revolving hydraulic motor () drives a revolving device () in cooperation with a revolving electric motor (). The motor generator () and the revolving electric motor () are connected electrically to an electricity storage device (). An HCU () sets a target electricity storage rate (SOC) of the electricity storage device () and a pump output limit (POL) of the hydraulic pump () corresponding to a mode selected by a mode selection device (). The HCU () controls the engine (), the motor generator (), the revolving electric motor () and the electricity storage device () corresponding to the target electricity storage rate (SOC) and the pump output limit (POL).

Hybrid construction machine

A hybrid work machine includes a controller and a temperature sensor that detects an electric storage device temperature. In a case where (Tp+Tc)&#x2265;Te_min, the controller carries out a first comparison in which the controller compares a value of [(Tp+Tc)&#x2212;Te_min] with a value of Ta_SOC, and the controller then selects a lower value of the first comparison. The controller then carries out a second comparison in which the controller compares the selected lower value of the first comparison with a value of [(Tp+Tc)&#x2212;Te_max)]. The controller then sets a higher value of the second comparison as the torque of the assist motor Ta, wherein Tc is an accessory torque, Ta_SOC is an adjustment assist motor torque based on a current state of charge of the electric storage device, Ta is the torque of the assist motor, and Te_max is an engine maximum torque.

Hybrid work machine

A control device of construction machine that performs tasks by driving a hydraulic pump by means of an electric motor that is driven by electric power of a battery device that is capable to charge and discharge and an engine that is mechanically coupled to the electric motor, includes: a charging/discharging control unit that controls the charging/discharging of the battery device in such a manner that, in case that a heavy load task where an output of the hydraulic pump is large and a light load task where the output of the hydraulic pump is small are alternately performed, when the output of the hydraulic pump during the heavy load task is increased or a time proportion of the heavy load task in the unit period is increased, an average value of charging current of the battery device per the unit period increases, and when the output of the hydraulic pump during the heavy load task is further increased or the time proportion of the heavy load task in the unit period is further increased, then the average value of the charging current of the battery device per the unit period decreases.

Control device of construction machine

A construction machine including an internal combustion engine controlled based on a torque command, an electric motor mechanically connected to the internal combustion engine, and an electric energy storage device that supplies electric power to the electric motor, the construction machine performing work by driving a hydraulic pressure generator using the internal combustion engine and the electric motor, the construction machine including: a speed control device that controls a speed of the electric motor based on a speed command; and a torque limiter that limits the torque command relative to a torque target, wherein the torque command is limited by the torque limiter in such a manner that a rate of change with time of the torque command is limited to be equal to or less than a predetermined value.

To uniformly cool down armature windings along the circumferential direction of a stator in a generator motor. A generator motor includes a statorfixed to the inner diameter side of a housing, a rotorrotatably supported by bearings, and armature windings wound around the teeth of a stator core. Each of bracketsprovided via the bearingshas a passagethrough which cooling oil flows and injection holeswhich communicate with the passage and inject cooling oil at positions opposite to winding ends of the armature windings. Cooling oil is injected toward the winding ends of the armature windings from the injection holesof the bracketsarranged on opposite axial sides of a shaft. In the flow rate distribution of the oil from the plurality of the injection holes, the flow rate of the oil from any of the injection holesis set to be greater as the position of the injection holeis higher above the level of the shaft. The arrangement pitch among the injection holesprovided on each of the bracketsis dense in a vertically upper portion of the bracket, and gradually sparser in a portion thereof closer to the level of shaft

Generator motor and electric vehicle using same

Growing community of inventors

Hitachinaka, Japan

Seiji Ishida