Patents by Inventor Hisao Niwa
Hisao Niwa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10838474Abstract: An electric power supply system includes: a load; a first switch configured to connect a first electric power supply unit and the load to each other by a first route; a second switch configured to connect the first electric power supply unit and the load to each other by a second route; a third switch configured to connect a second electric power supply unit and the load to each other by a third route; a fourth switch configured to connect the second electric power supply unit and the load to each other by a fourth route; a first rectifying device provided in the second route and configured to carry out rectification from the first electric power supply unit toward the load; and a second rectifying device provided in the fourth route and configured to carry out rectification from the second electric power supply unit toward the load.Type: GrantFiled: January 28, 2019Date of Patent: November 17, 2020Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Hisao Niwa
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Publication number: 20190243434Abstract: An electric power supply system includes: a load; a first switch configured to connect a first electric power supply unit and the load to each other by a first route; a second switch configured to connect the first electric power supply unit and the load to each other by a second route; a third switch configured to connect a second electric power supply unit and the load to each other by a third route; a fourth switch configured to connect the second electric power supply unit and the load to each other by a fourth route; a first rectifying device provided in the second route and configured to carry out rectification from the first electric power supply unit toward the load; and a second rectifying device provided in the fourth route and configured to carry out rectification from the second electric power supply unit toward the load.Type: ApplicationFiled: January 28, 2019Publication date: August 8, 2019Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Hisao NIWA
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Publication number: 20120262106Abstract: There is provided a power supply control device 10 which can determine a deterioration state of a sub-battery 30 appropriately and determine permission/prohibition of running of a vehicle based on the result of deterioration determination. The power supply control device 10 has a first power supply 16, a second power supply 30 composed of a secondary battery, a DC/DC converter 14 which converts a voltage of the first power supply 16 and enables the second power supply 30 to be charged with the converted output voltage, and a controller 31 which controls the DC/DC converter 14 and determines deterioration of the second power supply 30.Type: ApplicationFiled: January 31, 2011Publication date: October 18, 2012Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Yuji Omiya, Hisao Niwa
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Patent number: 8139333Abstract: A short circuit protection circuit which readily recovers a relay drive circuit to an output operation state after a short circuit is cancelled while preventing the relay drive circuit from being damaged by a short circuit. The relay drive circuit outputs a drive current to a load in accordance with a first control signal. A short circuit detection circuit detects the occurrence of a short circuit at an output side of the relay drive circuit and suspends output operation of the relay drive circuit when a short circuit occurs. Further, the short circuit detection circuit intermittently transmits a recovery signal to the relay drive circuit in a certain time interval after a predetermined time elapses from when the short circuit occurs to recover the output operation of the relay drive circuit. The time interval is gradually increased whenever the recovery signal is transmitted.Type: GrantFiled: April 8, 2009Date of Patent: March 20, 2012Assignee: Kabushiki Kaisha Tokai Rika Denki SeisakushoInventors: Takao Imai, Hiroshi Mori, Jun Ito, Hisao Niwa
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Publication number: 20110043171Abstract: A power generation controller for controlling a power generation voltage of a generator; the power generation controller including a warning unit that warns about a start of a high-power load, a power generation voltage setting unit that sets a target of the power generation voltage of the generator and switches the target from a first voltage corresponding to a normal-power load to a second voltage that is higher than the first voltage when a warning is received from the warning unit, and an excitation current controller that controls an excitation current of the generator so that the power generation voltage of the generator becomes the first voltage when the target is the first voltage, and controls the excitation current of the generator so that the power generation voltage of the generator becomes the second voltage when the target is switched to the second voltage.Type: ApplicationFiled: October 31, 2008Publication date: February 24, 2011Applicant: Toyota Jidosha Kabushiki KaishaInventor: Hisao Niwa
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Publication number: 20090257159Abstract: A short circuit protection circuit which readily recovers a relay drive circuit to an output operation state after a short circuit is cancelled while preventing the relay drive circuit from being damaged by a short circuit. The relay drive circuit outputs a drive current to a load in accordance with a first control signal. A short circuit detection circuit detects the occurrence of a short circuit at an output side of the relay drive circuit and suspends output operation of the relay drive circuit when a short circuit occurs. Further, the short circuit detection circuit intermittently transmits a recovery signal to the relay drive circuit in a certain time interval after a predetermined time elapses from when the short circuit occurs to recover the output operation of the relay drive circuit. The time interval is gradually increased whenever the recovery signal is transmitted.Type: ApplicationFiled: April 8, 2009Publication date: October 15, 2009Applicant: KABUSHIKI KAISHA TOKAI RIKA DENKI SEISAKUSHOInventors: Takao IMAI, Hiroshi MORI, Jun ITO, Hisao NIWA
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Patent number: 6808841Abstract: A terminal unit (TU) includes a battery terminal (2) mounted at the leading end of a wiring harness (4), and a holder (8) mounted on the wiring harness (4) at a position distanced from the battery terminal (2). A current sensor (12) is transported separately from the terminal unit (TU) to a connection site to a battery (B). The battery terminal (2) is introduced through the current sensor (12) and the current sensor (12) then is coupled with the holder (8) at the connection site. This operation is performed at a position distanced from the battery (B), and hence can be performed smoothly without being hindered.Type: GrantFiled: October 31, 2001Date of Patent: October 26, 2004Assignee: Sumitomo Wiring Systems, Ltd.Inventors: Shigekazu Wakata, Masanori Wakui, Hisao Niwa, Naohiko Suzuki
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Patent number: 6551147Abstract: A battery-side terminal (2) includes a fastening ring (5) to be fixed to a battery post (1), and a connecting piece (8) extends from the fastening ring (5). A current sensor (4) includes a sensor portion (4A) formed with a slit (14) through which the connecting piece (8) is insertable. The battery-side terminal (2) and the current (4) are transported to a connection site while being assembled into one unit. At the connection site, the connecting piece (8) and the harness-side terminal (3) are aligned and placed one over the other, and are tightened by means of a bolt. This tightening operation is performed at a position distanced from a battery, and hence can be performed smoothly performed without being hindered.Type: GrantFiled: October 31, 2001Date of Patent: April 22, 2003Assignee: Sumitomo Wiring Systems, Ltd.Inventors: Shigekazu Wakata, Masanori Wakui, Hisao Niwa, Naohiko Suzuki
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Publication number: 20020116382Abstract: A change request input unit for utilization restriction information is provided in a user terminal of a data distribution system. A conversion unit gives a digital signature to the change request, encrypts it and transmits it to a data creator terminal through a communication unit and a network. Upon receipt of valid rewrite authorization for the utilization restriction information from the data creator terminal, the changed utilization restriction information is rewritten into a storage medium through a storage medium interface in accordance with the contents of the authorization given from a determination unit, thereby implementing a function in which a user can change the set utilization restriction under the valid authorization.Type: ApplicationFiled: January 30, 2002Publication date: August 22, 2002Inventors: Kazuhiro Koyama, Hisao Niwa, Satoru Inagaki, Takashi Tsuzuki
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Publication number: 20020051906Abstract: A battery-side terminal (2) includes a fastening ring (5) to be fixed to a battery post (1), and a connecting piece (8) extends from the fastening ring (5). A current sensor (4) includes a sensor portion (4A) formed with a slit (14) through which the connecting piece (8) is insertable. The battery-side terminal (2) and the current (4) are transported to a connection site while being assembled into one unit. At the connection site, the connecting piece (8) and the harness-side terminal (3) are aligned and placed one over the other, and are tightened by means of a bolt. This tightening operation is performed at a position distanced from a battery, and hence can be performed smoothly performed without being hindered.Type: ApplicationFiled: October 31, 2001Publication date: May 2, 2002Applicant: Sumitomo Wiring Systems, Ltd.Inventors: Shigekazu Wakata, Masanori Wakui, Hisao Niwa, Naohiko Suzuki
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Publication number: 20020051907Abstract: A terminal unit (TU) includes a battery terminal (2) mounted at the leading end of a wiring harness (4), and a holder (8) mounted on the wiring harness (4) at a position distanced from the battery terminal (2). A current sensor (12) is transported separately from the terminal unit (TU) to a connection site to a battery (B). The battery terminal (2) is introduced through the current sensor (12) and the current sensor (12) then is coupled with the holder (8) at the connection site. This operation is performed at a position distanced from the battery (B), and hence can be performed smoothly without being hindered.Type: ApplicationFiled: October 31, 2001Publication date: May 2, 2002Applicant: Sumitomo Wiring Systems, Ltd.Inventors: Shigekazu Wakata, Masanori Wakui, Hisao Niwa, Naohiko Suzuki
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Patent number: 6041141Abstract: There is disclosed a character recognition machine adapted to recognize Japanese characters such as kanjis and kanas. The machine comprises a character string storage portion, a character extraction portion, a character recognition portion, and a language processing portion. A character string to be recognized is stored as an image in the storage portion. The character extraction portion comprises a network consisting a plurality of interconnected operators each of which has numerous inputs and outputs. An evaluation function which assumes its minimum value when a character extraction produces the best results is calculated by the operators simultaneously so as to minimize the value of the function. The character recognition portion calculates degrees of similarity of a character pattern to various character categories, the character pattern being applied from the character extraction portion.Type: GrantFiled: August 10, 1995Date of Patent: March 21, 2000Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Hiroshi Yamamoto, Hisao Niwa, Yoshihiro Kojima, Susumu Maruno, Kazuhiro Kayashima, Toshiyuki Kouda, Hidetsugu Maekawa, Satoru Ito, Yasuharu Shimeki
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Patent number: 5987170Abstract: There is disclosed a character recognition machine adapted to recognize Japanese characters such as kanjis and kanas. The machine comprises a character string storage portion, a character extraction portion, a character recognition portion, and a language processing portion. A character string to be recognized is stored as an image in the storage portion. The character extraction portion comprises a network consisting a plurality of interconnected operators each of which has numerous inputs and outputs. An evaluation function which assumes its minimum value when a character extraction produces the best results is calculated by the operators simultaneously so as to minimize the value of the function. The character recognition portion calculates degrees of similarity of a character pattern to various character categories, the character pattern being applied from the character extraction portion.Type: GrantFiled: November 6, 1997Date of Patent: November 16, 1999Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Hiroshi Yamamoto, Hisao Niwa, Yoshihiro Kojima, Susumu Maruno, Kazuhiro Kayashima, Yasuharu Shimeki, Toshiyuki Kouda, Hidetsugu Maekawa, Satoru Ito
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Patent number: 5689583Abstract: A character recognition unit recognizes a document image to output character candidates; a character correction unit selects a corrected character string which is correct with respect to grammar and vocabulary, from a set of character candidates from the character recognition unit; a keyword extraction unit extracts keywords of a document to be recognized, from the corrected character string; and wherein the character correction unit selects the corrected character string by a use of BUNSETSU evaluation representing correctness with respect to grammar and vocabulary, and an evaluation of the BUNSETSU is increased when the BUNSETSU has the keyword outputted from the keyword extraction unit.Type: GrantFiled: May 23, 1996Date of Patent: November 18, 1997Assignee: Matsushita Electric Industrial Co. Ltd.Inventors: Hisao Niwa, Kazuhiro Kayashima, Yasuharu Shimeki, Hidetsugu Maekawa
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Patent number: 5434869Abstract: A test pattern generating apparatus for generating test patterns to test a sequential circuit having at least one memory element. The apparatus calculates, in response to a primary input applied to the sequential circuit, analog logic values for signal lines in the sequential circuit using a nonlinear function, then stores history data for the analog logic values with an inverse covariance matrix of the analog logic values. The apparatus then calculates an evaluation value according to the degree of variance between the analog logic values and the history data. A primary input setting unit is used for producing a next primary input which provides a maximum evaluation value from the evaluation value obtained from the present primary input. inputs produced by the primary input setting unit.Type: GrantFiled: August 28, 1992Date of Patent: July 18, 1995Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Hidetsugu Maekawa, Yasuharu Shimeki, Kazuhiro Kayashima, Hisao Niwa, Seiichi Shin
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Patent number: 5341315Abstract: A test pattern generation device for producing test pattern signals for testing a preselected digital circuit includes a dominant pattern signal generator and a subservient pattern signal generator. When a first dominant pattern signal (0,0,0,0,0) is generated, five subservient pattern signals (1,0,0,0,0), (0,1,0,0,0), (0,0,1,0,0), (0,0,0,1,0) and (0,0,0,0,1) are generated, each being unit Hamming distance from the dominant pattern signal. The subservient pattern signals are sequentially applied to a simulator carrying a hypothetical digital circuit for producing a controllability cost CCO.sub.f and a continuous cyclic logic value CV.sub.f at a preselected line G.sub.f in the digital circuit for each subservient pattern signal. A cost generator produces an evaluation cost CT.sub.f by the use of the controllability cost CCO.sub.f and the continuous cyclic logic value CV.sub.f for each subservient pattern signal.Type: GrantFiled: March 13, 1992Date of Patent: August 23, 1994Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Hisao Niwa, Kazuhiro Kayashima