Patents by Inventor Michitaka FUJIWARA
Michitaka FUJIWARA 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: 11018617Abstract: Provided is a rotation angle detection device, including: a rotation angle sensor; an input circuit configured to output a rotation angle signal and an abnormality signal; a calculation processing unit con tired to calculate a rotation angle calculation value and a rotation speed calculation value based on a rotation angle detection value at a predetermined preset calculation timing; and a rotation angle estimation processing unit configured to calculate a rotation angle estimation value after the calculation timing based on the rotation angle calculation value and the rotation speed calculation value. When the abnormality signal is received, the calculation processing unit calculates the rotation angle calculation value and the rotation speed calculation value based on the rotation angle estimation value, in place of the rotation angle detection value.Type: GrantFiled: May 24, 2017Date of Patent: May 25, 2021Assignee: Mitsubishi Electric CorporationInventors: Hayato Kamizawa, Kiyohiro Morita, Michitaka Fujiwara
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Publication number: 20200382044Abstract: Provided is a rotation angle detection device, including: a rotation angle sensor; an input circuit configured to output a rotation angle signal and an abnormality signal; a calculation processing unit con tired to calculate a rotation angle calculation value and a rotation speed calculation value based on a rotation angle detection value at a predetermined preset calculation timing; and a rotation angle estimation processing unit configured to calculate a rotation angle estimation value after the calculation timing based on the rotation angle calculation value and the rotation speed calculation value. When the abnormality signal is received, the calculation processing unit calculates the rotation angle calculation value and the rotation speed calculation value based on the rotation angle estimation value, in place of the rotation angle detection value.Type: ApplicationFiled: May 24, 2017Publication date: December 3, 2020Applicant: Mitsubishi Electric CorporationInventors: Hayato KAMIZAWA, Kiyohiro MORITA, Michitaka FUJIWARA
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Patent number: 10602985Abstract: A contact detection instrument including a rod, a tip sensor portion that is attached to one end of the rod and is inserted into a living body through a hole, a speaker that, from outside the living body, inputs a sound into a hollow space that is formed in the interior of the rod and the tip sensor portion, and a microphone that, outside the living body, outputs an electrical signal that corresponds to the sound inside the hollow space, with the tip sensor portion including an elastic material that covers the hollow space.Type: GrantFiled: August 4, 2015Date of Patent: March 31, 2020Assignees: NAGOYA INSTITUTE OF TECHNOLOGY, NATIONAL UNIVERSITY CORPORATION NAGOYA UNIVERSITYInventors: Yoshihiro Tanaka, Akihito Sano, Michitaka Fujiwara
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Patent number: 10358995Abstract: An engine automatic stop/restart device includes an ignition-prohibition-decision unit that prohibits an ignition for an engine, which is controlled by the ignition-control unit, when a reverse rotation of the engine is detected based on a crank-angle signal; and an ignition-prohibition-release-decision unit that releases an ignition prohibition, after the ignition is prohibited by the ignition-prohibition-decision unit; in which the ignition-prohibition-release-decision unit releases the ignition prohibition when regular rotational signals of the engine, of which count is greater than or equal to a predetermined count, is detected and an engine revolution number is greater than or equal to a predetermined revolution number, after the reverse rotation of the engine is detected, and before a crank is positioned at a compression top dead center of the engine.Type: GrantFiled: July 20, 2012Date of Patent: July 23, 2019Assignee: Mitsubishi Electric CorporationInventors: Michitaka Fujiwara, Tsuneo Tanabe
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Patent number: 10135380Abstract: An AC rotary machine control apparatus is provided with: predriver ICs for giving drive signals to the gates of power converting switching elements bridge-connected to the respective phases of an AC rotary machine; predriver IC output cutting-off switching elements for operating on the basis of a cut-off signal from a calculation processing device having detected an abnormality state of the predriver ICs, and cutting off drive signals given from the predriver ICs to the gates of the power converting switching elements; and a gate driver circuit for becoming conductive on the basis of a signal from the calculation processing device and giving drive signals from a power source circuit to all the gates of the lower arm elements of the power converting switching elements, when drive signals from the predriver Ics are being cut off by the predriver IC output cutting-off switching elements.Type: GrantFiled: February 27, 2017Date of Patent: November 20, 2018Assignee: Mitsubishi Electric CorporationInventors: Michitaka Fujiwara, Toshiaki Date
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Patent number: 10027265Abstract: An inverter control device and inverter control method are such that, when there is a possibility of induction voltage caused by a multi-phase motor exceeding a breakdown voltage of a switching element of an inverter, two of three phases are first interrupted at an appropriate timing in order to restrict induction voltage when shifting from a three-phase short circuit to an all-phase interruption, after which a shift is made to an all-phase interruption at a timing at which currents of the three phases reach the vicinity of zero, whereby a leap in a direct current bus voltage is restricted.Type: GrantFiled: June 29, 2017Date of Patent: July 17, 2018Assignee: Mitsubishi Electric CorporationInventors: Shingo Harada, Keiichi Enoki, Masutaka Watanabe, Yoshimasa Nishijima, Yasukazu Murata, Michitaka Fujiwara
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Patent number: 10014815Abstract: When an abnormality is detected by an abnormality detection unit, a first switching stop device turns OFF all of switching elements connected to one arm of either an upper arm or a lower arm of a power converter, and turns ON all of the switching elements connected to the arm, which are not turned OFF; when the abnormality is continuously detected even after operating the first switching stop device, a second switching stop device turns ON or turns OFF the switching elements connected to the upper arm and the lower arm so that the turn-ON and the turn-OFF are reversed to the operation by the first switching stop device; and when the abnormality is continuously detected even after operating the second switching stop device, a third switching stop device turns OFF all of the switching elements in the upper arm and the lower arm.Type: GrantFiled: March 6, 2017Date of Patent: July 3, 2018Assignee: Mitsubishi Electric CorporationInventors: Shingo Yamaguchi, Michitaka Fujiwara
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Publication number: 20180138844Abstract: An inverter control device and inverter control method are such that, when there is a possibility of induction voltage caused by a multi-phase motor exceeding a breakdown voltage of a switching element of an inverter, two of three phases are first interrupted at an appropriate timing in order to restrict induction voltage when shifting from a three-phase short circuit to an all-phase interruption, after which a shift is made to an all-phase interruption at a timing at which currents of the three phases reach the vicinity of zero, whereby a leap in a direct current bus voltage is restricted.Type: ApplicationFiled: June 29, 2017Publication date: May 17, 2018Applicant: Mitsubishi Electric CorporationInventors: Shingo HARADA, Keiichi ENOKI, Masutaka WATANABE, Yoshimasa NISHIJIMA, Yasukazu MURATA, Michitaka FUJIWARA
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Publication number: 20170310269Abstract: When an abnormality is detected by an abnormality detection unit, a first switching stop device turns OFF all of switching elements connected to one arm of either an upper arm or a lower arm of a power converter, and turns ON all of the switching elements connected to the arm, which are not turned OFF; when the abnormality is continuously detected even after operating the first switching stop device, a second switching stop device turns ON or turns OFF the switching elements connected to the upper arm and the lower arm so that the turn-ON and the turn-OFF are reversed to the operation by the first switching stop device; and when the abnormality is continuously detected even after operating the second switching stop device, a third switching stop device turns OFF all of the switching elements in the upper arm and the lower arm.Type: ApplicationFiled: March 6, 2017Publication date: October 26, 2017Applicant: Mitsubishi Electric CorporationInventors: Shingo YAMAGUCHI, Michitaka FUJIWARA
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Publication number: 20170310267Abstract: An AC rotary machine control apparatus is provided with: predriver ICs for giving drive signals to the gates of power converting switching elements bridge-connected to the respective phases of an AC rotary machine; predriver IC output cutting-off switching elements for operating on the basis of a cut-off signal from a calculation processing device having detected an abnormality state of the predriver ICs, and cutting off drive signals given from the predriver ICs to the gates of the power converting switching elements; and a gate driver circuit for becoming conductive on the basis of a signal from the calculation processing device and giving drive signals from a power source circuit to all the gates of the lower arm elements of the power converting switching elements, when drive signals from the predriver Ics are being cut off by the predriver IC output cutting-off switching elements.Type: ApplicationFiled: February 27, 2017Publication date: October 26, 2017Applicant: Mitsubishi Electric CorporationInventors: Michitaka FUJIWARA, Toshiaki DATE
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Publication number: 20170265814Abstract: A contact detection instrument 1 is provided with a rod 12, a tip sensor portion 20 that is attached to one end of the rod 12 and is inserted into a living body through a hole, a speaker 14 that, from outside the living body, inputs a sound into a hollow space that is formed in the interior of the rod 12 and the tip sensor portion 20, and a microphone 15 that, outside the living body, outputs an electrical signal that corresponds to the sound inside the hollow space, with the tip sensor portion 20 including an elastic material that covers the hollow space.Type: ApplicationFiled: August 4, 2015Publication date: September 21, 2017Applicants: NAGOYA INSTITUTE OF TECHNOLOGY, NATIONAL UNIVERSITY CORPORATION NAGOYA UNIVERSITYInventors: Yoshihiro TANAKA, Akihito SANO, Michitaka FUJIWARA
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Patent number: 9739249Abstract: In order to provide an engine automatic stop and restart apparatus capable of realizing excellent startability, and preventing an excessive load from being imposed on a starter (30) and a power transmission system, a starter drive inhibition determination section (12) inhibits, in a case where an engine restart condition is satisfied, when a backward rotation of an engine (20) is detected based on a crank angle of a crankshaft of the engine (20) detected by a crank angle sensor (1) for detecting the crank angle, a drive of the starter (30) configured to crank the crankshaft so as to restart the engine (20), and releases, when a stop of the engine (20) is detected, the drive inhibition of the starter (30).Type: GrantFiled: October 12, 2012Date of Patent: August 22, 2017Assignee: Mitsubishi Electric CorporationInventors: Masami Nakashima, Takeru Okabe, Osamu Ishikawa, Michitaka Fujiwara
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Patent number: 9726134Abstract: A device for automatically stopping and restarting an internal combustion engine is provided with a crank angle sensor (1) that detects a crank angle of an engine (10), a fuel injection unit (11) that injects fuel into the engine, and the device is also provided with a starter activation prohibition determination means that prohibits activation of a starter (20) by determining that the engine is in reverse rotation during inertial rotation of the engine, and removes the starter activation prohibition depending on the crank angle when the engine starts reverse rotation.Type: GrantFiled: April 3, 2012Date of Patent: August 8, 2017Assignee: Mitsubishi Electric CorporationInventors: Takeru Okabe, Osamu Ishikawa, Tomohisa Shoda, Michitaka Fujiwara
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Publication number: 20150219060Abstract: In order to provide an engine automatic stop and restart apparatus capable of realizing excellent startability, and preventing an excessive load from being imposed on a starter (30) and a power transmission system, a starter drive inhibition determination section (12) inhibits, in a case where an engine restart condition is satisfied, when a backward rotation of an engine (20) is detected based on a crank angle of a crankshaft of the engine (20) detected by a crank angle sensor (1) for detecting the crank angle, a drive of the starter (30) configured to crank the crankshaft so as to restart the engine (20), and releases, when a stop of the engine (20) is detected, the drive inhibition of the starter (30).Type: ApplicationFiled: October 12, 2012Publication date: August 6, 2015Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Masami Nakashima, Takeru Okabe, Osamu Ishikawa, Michitaka Fujiwara
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Patent number: 8915228Abstract: An engine control section (50) is configured to: start power supply to pinion-gear moving sections (21, 22) based on an engine rpm which becomes smaller than an rpm at which the meshing engagement is possible while the engine is rotating by inertia as a result of satisfaction of an automatic stop condition; temporarily stop the power supply to the pinion-gear moving sections when an amount of change in the rpm of the engine exceeds a predetermined increase detection threshold value before time required for a pinion gear (24) to come into abutment against a ring gear (12) elapses after the start of the power supply; and restart the power supply to the pinion-gear moving sections when the amount of change in the rpm of the engine becomes smaller than a predetermined decrease detection threshold value after the power supply is temporarily stopped.Type: GrantFiled: March 9, 2012Date of Patent: December 23, 2014Assignee: Mitsubishi Electric CorporationInventors: Michitaka Fujiwara, Tsuneo Tanabe
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Publication number: 20140345556Abstract: A device for automatically stopping and restarting an internal combustion engine is provided with a crank angle sensor (1) that detects a crank angle of an engine (10), a fuel injection unit (11) that injects fuel into the engine, and the device is also provided with a starter activation prohibition determination means that prohibits activation of a starter (20) by determining that the engine is in reverse rotation during inertial rotation of the engine, and removes the starter activation prohibition depending on the crank angle when the engine starts reverse rotation.Type: ApplicationFiled: April 3, 2012Publication date: November 27, 2014Applicant: Mitsubishi Electric CorporationInventors: Takeru Okabe, Osamu Ishikawa, Tomohisa Shoda, Michitaka Fujiwara
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Patent number: 8800523Abstract: An apparatus including an engine control unit which is configured to: start to supply electricity to a starter motor and start measurement of a power supply period; supply electricity to a solenoid when an absolute value of a rpm difference between an rpm of the engine and an estimated rpm of a pinion gear determined from a rpm table based on the measured power supply period becomes smaller than a rpm difference threshold value at which the pinion gear and a ring gear can be engaged with each other; judge that the engine is self-resumed when the engine becomes a state capable of self rotation with only fuel supply in a case where the rpm of the engine is larger than the estimated rpm of the pinion gear; and finish supplying electricity to the starter motor and finish measuring the power supply period, and finish supplying electricity to the solenoid.Type: GrantFiled: April 15, 2011Date of Patent: August 12, 2014Assignee: Mitsubishi Electric CorporationInventors: Michitaka Fujiwara, Tsuneo Tanabe
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Patent number: 8763581Abstract: In an internal combustion engine automatic-stop/restart control system according to the present invention, excellent restartability of an internal combustion engine is ensured in such a way that, while the internal combustion engine inertially rotates after its automatic stop, a solenoid of a starting apparatus for starting the internal combustion engine is driven so that a pinion gear is moved in the axis direction and pushing the pinion gear against a ring gear is started, and detection of a reference signal through a crank angle signal is prohibited until a predetermined period elapses after the pushing has been started so that erroneous reference signal recognition is prevented.Type: GrantFiled: October 21, 2011Date of Patent: July 1, 2014Assignee: Mitsubishi Electric CorporationInventors: Michitaka Fujiwara, Tsuneo Tanabe
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Publication number: 20140100763Abstract: The engine automatic stop and restart apparatus includes: a crank-angle sensor for detecting a crank angle of a crankshaft of an engine; a starter for cranking the crankshaft to restart the engine; a fuel injection device for injecting a fuel into the engine; an ignition device for igniting the injected fuel; a reverse-rotation determining section for determining occurrence of reverse rotation of the crankshaft based on the crank angle detected by the crank-angle sensor before the occurrence of the reverse rotation; and an ignition control section for inhibiting energization of the ignition device from being started when the occurrence of the reverse rotation of the crankshaft is determined by the reverse-rotation determining section before the start of the energization of the ignition device.Type: ApplicationFiled: March 26, 2013Publication date: April 10, 2014Inventor: Michitaka FUJIWARA
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Publication number: 20130238224Abstract: An engine automatic stop/restart device includes an ignition-prohibition-decision unit that prohibits an ignition for an engine, which is controlled by the ignition-control unit, when a reverse rotation of the engine is detected based on a crank-angle signal; and an ignition-prohibition-release-decision unit that releases an ignition prohibition, after the ignition is prohibited by the ignition-prohibition-decision unit; in which the ignition-prohibition-release-decision unit releases the ignition prohibition when regular rotational signals of the engine, of which count is greater than or equal to a predetermined count, is detected and an engine revolution number is greater than or equal to a predetermined revolution number, after the reverse rotation of the engine is detected, and before a crank is positioned at a compression top dead center of the engine.Type: ApplicationFiled: July 20, 2012Publication date: September 12, 2013Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Michitaka FUJIWARA, Tsuneo TANABE