Patents Assigned to Hitachi Mito Engineering
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Patent number: 8964414Abstract: A DC power supply including a resonant circuit on a secondary side of a transformer suppresses a surge voltage during power recovery of diodes constituting a rectifier circuit, correctly estimates a load current from a secondary current of the transformer, and adjusts supplied power when a load is light. The DC power supply includes a DC voltage source, a converter, a transformer, a rectifier circuit, a resonant circuit composed of a resonant switch and a resonant capacitor, a filter reactor, a filter capacitor, a snubber diode, a snubber capacitor, a load, first and second voltage sensors, a current sensor, and a controller for controlling gate pulses of semiconductor devices constituting a converter and the resonant switch and a signal for adjusting operation timings of A/D converters converting the signals of these sensors.Type: GrantFiled: May 25, 2012Date of Patent: February 24, 2015Assignees: Hitachi, Ltd., Hitachi Mito Engineering Co., Ltd.Inventors: Tetsuo Kojima, Yuichiro Nozaki, Masafumi Makino, Takeshi Shinomiya, Tetsu Sugiura
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Patent number: 7740111Abstract: An elevator group control system for controlling multiple elevators cars each of which serves a plurality of floors includes a route preparation section which, at a time of assigning a hall call to one of the elevator cars, calculates a future trajectory for each of the elevator cars. The future trajectory for each elevator is for a case in which the hall call is assigned to the elevator car. A selecting unit which determines a selected one of the elevator cars to which the hall call is to be assigned using the calculated future trajectories.Type: GrantFiled: July 22, 2009Date of Patent: June 22, 2010Assignees: Hitachi, Ltd., Hitachi Mito Engineering Co., Ltd.Inventors: Toshifumi Yoshikawa, Satoru Toriyabe, Takamichi Hoshino, Atsuya Fujino, Shunichi Tanae, Hiromi Inaba, Kenji Yoneda, Toru Yamaguchi, Ryo Okabe
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Patent number: 7730999Abstract: An elevator group control system includes a reference route generating portion, which for each elevator, generates a reference route which the elevator should follow with respect to the time axis and position axis; and an assignment portion which selects an elevator for assignment to a generated hall call so as to make the actual trajectory of each elevator closer to its reference route. Reference routes which guide the cage's trajectory into temporally equal interval condition are generated, and car assignment is executed to allow the cages to settle in temporally equal interval condition over a long period of time.Type: GrantFiled: August 5, 2008Date of Patent: June 8, 2010Assignees: Hitachi, Ltd., Hitachi Mito Engineering Co., Ltd.Inventors: Toshifumi Yoshikawa, Satoru Toriyabe, Takamichi Hoshino, Atsuya Fujino, Shunichi Tanae, Hiromi Inaba, Kenji Yoneda, Toru Yamaguchi, Ryo Okabe
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Publication number: 20090283368Abstract: An elevator group control system includes a reference route generating portion, which for each elevator, generates a reference route which the elevator should follow with respect to the time axis and position axis; and an assignment portion which selects an elevator for assignment to a generated hall call so as to make the actual trajectory of each elevator closer to its reference route. Reference routes which guide the cage's trajectory into temporally equal interval condition are generated, and car assignment is executed to allow the cages to settle in temporally equal interval condition over a long period of time.Type: ApplicationFiled: July 22, 2009Publication date: November 19, 2009Applicants: HITACHI, LTD., Hitachi Mito Engineering Co., Ltd.Inventors: Toshifumi Yoshikawa, Satoru Toriyabe, Takamichi Hoshino, Atsuya Fujino, Shunichi Tanae, Hiromi Inaba, Kenji Yoneda, Toru Yamaguchi, Ryo Okabe
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Patent number: 7562746Abstract: A method and a display for elevator allocation evaluating are provided. When an elevator allocated to a hall call is selected by employing two different view points such as a real and a future call evaluation index, an elevator allocation reason and a balance between the two view points can be easily grasped. An elevator allocated to a hall call is evaluated on orthogonal coordinates in which the real call evaluation index and the future call evaluation index are defined as an X and a Y coordinate axis. Evaluation indexes of first to fourth elevator cars are evaluated by employing contour lines of a synthetic evaluation function, which is represented as the real and the future call evaluation index. A weight for allocating is displayed visually.Type: GrantFiled: February 17, 2006Date of Patent: July 21, 2009Assignees: Hitachi, Ltd., Hitachi Mito Engineering Co., Ltd.Inventors: Toshifumi Yoshikawa, Satoru Toriyabe, Takamichi Hoshino, Shunichi Tanae, Atsuya Fujino, Ryou Okabe, Masaya Furuhashi, Kenji Yoneda
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Publication number: 20080289911Abstract: An elevator group control system includes a reference route generating portion, which for each elevator, generates a reference route which the elevator should follow with respect to the time axis and position axis; and an assignment portion which selects an elevator for assignment to a generated hall call so as to make the actual trajectory of each elevator closer to its reference route. Reference routes which guide the cage's trajectory into temporally equal interval condition are generated, and car assignment is executed to allow the cages to settle in temporally equal interval condition over a long period of time.Type: ApplicationFiled: August 5, 2008Publication date: November 27, 2008Applicants: Hitachi, Ltd., Hitachi Mito Engineering Co., Ltd.Inventors: Toshifumi YOSHIKAWA, Satoru Toriyabe, Takamichi Hoshino, Atsuya Fujino, Shunichi Tanae, Hiromi Inaba, Kenji Yoneda, Toru Yamaguchi, Ryo Okabe
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Patent number: 7426982Abstract: An elevator group control system is provided which stably keeps cage's position in temporally equal interval condition over a long period of time. The present invention provides a system comprising: reference route generating means, which for each elevator, generates a reference route which the elevator should follow with respect to the time axis and position axis; and assignment means which selects an elevator for assignment to a generated hall call so as to make the actual trajectory of each elevator closer to its reference route. Since reference routes which guides the cage's trajectory into temporally equal interval condition are generated and car assignment is executed so as to make the respective cages follow their reference routes, it is possible to allow the cages to settle in temporally equal interval condition over a long period of time.Type: GrantFiled: August 25, 2005Date of Patent: September 23, 2008Assignees: Hitachi, Ltd., Hitachi Mito Engineering Co., Ltd.Inventors: Toshifumi Yoshikawa, Satoru Toriyabe, Takamichi Hoshino, Atsuya Fujino, Shunichi Tanae, Hiromi Inaba, Kenji Yoneda, Toru Yamaguchi, Ryo Okabe
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Publication number: 20060249335Abstract: A method and a display for elevator allocation evaluating are provided. When an elevator allocated to a hall call is selected by employing two different view points such as a real and a future call evaluation index, an elevator allocation reason and a balance between the two view points can be easily grasped. An elevator allocated to a hall call is evaluated on orthogonal coordinates in which the real call evaluation index and the future call evaluation index are defined as an X and a Y coordinate axis. Evaluation indexes of first to fourth elevator cars are evaluated by employing contour lines of a synthetic evaluation function, which is represented as the real and the future call evaluation index. A weight for allocating is displayed visually.Type: ApplicationFiled: February 17, 2006Publication date: November 9, 2006Applicants: Hitachi, Ltd., Hitachi Mito Engineering Co., Ltd.Inventors: Toshifumi Yoshikawa, Satoru Toriyabe, Takamichi Hoshino, Shunichi Tanae, Atsuya Fujino, Ryou Okabe, Masaya Furuhashi, Kenji Yoneda
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Publication number: 20040216636Abstract: A hybrid transport vehicle, which needs an overhead wire and/or a railway and has a plurality of kinds of energy supply systems and/or driving apparatuses, is provided with a condition detection device for detecting an energy supply condition of the energy supply systems and/or an operation condition of the driving apparatuses, and an informing device for informing the energy supply condition and/or the operation condition, detected by the condition detection device.Type: ApplicationFiled: March 2, 2004Publication date: November 4, 2004Applicants: Hitachi, Ltd., Hitachi Mito Engineering Co., Ltd.Inventors: Akihiko Emori, Eiichi Toyota, Masato Suzuki, Motomi Shimada, Tsutomu Miyauchi
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Patent number: 6557306Abstract: To provide sufficient clearance for an entrance part of an elevator hall facing a non-seismic isolation building portion, the partition wall on the entrance side may be removed and an expansion floor provided between the non-seismic isolation building portion entrance and the elevator shaft landing. A movable wall is provided between partition members located on the right and left sides of the elevator shaft. The expansion floor can move in the front and back directions with the partition members on the right and left sides as a guide. Furthermore, the wall moves with the elevator shaft independently in the right and left directions and follows the non-seismic isolation building movement.Type: GrantFiled: August 28, 2000Date of Patent: May 6, 2003Assignees: Hitachi, Ltd., Hitachi Mito Engineering Co., Ltd.Inventors: Yuji Sekiya, Masayuki Shigeta, Sadanori Kuroda
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Patent number: 5638266Abstract: The invention is directed to a neutral point clamped electric power conversion apparatus having four semiconductor switching elements connected in series. The capacity of outer free wheel diodes connected in reverse parallel with outer semiconductor switching elements are increased compared to that of inner free wheel diodes, thereby minimizing, an imbalance in losses between the inner and the outer free wheel diodes.Type: GrantFiled: March 10, 1995Date of Patent: June 10, 1997Assignees: Hitachi, Ltd., Hitachi Mito Engineering Co., Ltd.Inventors: Akira Horie, Syuuji Saitou, Hiroshi Itahana
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Patent number: 5526919Abstract: Escalator apparatus of the invention is of the type that has a step whose step board can be raised to provide a surface for carrying a wheelchair. In order to realize conveyance of a large size wheelchair or handcart without changing the installation space for the escalator, the escalator apparatus of the invention is structured such that the step boards of a plurality of adjacent steps are movable upwardly and downwardly.Type: GrantFiled: June 2, 1995Date of Patent: June 18, 1996Assignees: Hitachi, Ltd., Hitachi Mito Engineering Co., Ltd.Inventors: Kazuhira Ojima, Chuichi Saito, Kazutoshi Takeda, Toshiyuki Tamatsu
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Patent number: 5386904Abstract: Escalator apparatus of the invention is of the type that has a step whose step board can be raised to provide a surface for carrying a wheelchair. In order to realize conveyance of a large size wheelchair or handcart without changing the installation space for the escalator, the escalator apparatus of the invention is structured such that the step boards of a plurality of adjacent steps are movable upwardly and downwardly.Type: GrantFiled: February 7, 1994Date of Patent: February 7, 1995Assignees: Hitachi, Ltd., Hitachi Mito EngineeringInventors: Kazuhira Ojima, Chuichi Saito, Kazutoshi Takeda, Toshiyuki Tamatsu