Patents by Inventor Hirofumi EBISUMOTO
Hirofumi EBISUMOTO 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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Publication number: 20230311672Abstract: A control device for an electric vehicle is provided, which includes a drive motor of which magnetic poles of a rotor are comprised of variable magnetism magnets, and a clutch disposed between the drive motor and driving wheels. When the electric vehicle travels, the control device performs a torque control, and a first clutch control in which an engaging torque of the clutch is controlled to be higher than a demanded torque. When performing a magnetization control when the electric vehicle travels, the control device changes the clutch control from the first clutch control to a second clutch control in which the engaging torque is made to coincide with the demanded torque, before the execution of the magnetization control, and adds a given slip torque to the demanded torque to start a micro slip control in which the clutch is transitioned from an engaged state into a micro slip state.Type: ApplicationFiled: March 23, 2023Publication date: October 5, 2023Inventors: Hirofumi Ebisumoto, Tomohiro Yoshizue, Tsukasa Sori
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Patent number: 11529946Abstract: A control system for a movable body configured to move by utilizing a motor torque generated by a drive motor, is provided. The system includes the drive motor including a rotor configured to output a rotational force and provided with a variable-magnetic-force magnet, and a stator opposing the rotor with a gap therebetween and provided with a plurality of coils, a powertrain component provided so as to be associated with the drive motor, and a controller having a magnetization controlling module configured to control magnetizing current flowing through the coils so as to change a magnetic force of the variable-magnetic-force magnet. During a demagnetization control in which the magnetic force of the variable-magnetic-force magnet is reduced by the magnetization controlling module, the controller operates the powertrain component to suppress a decrease in a moving force applied to the movable body due to a decrease in the motor torque.Type: GrantFiled: January 15, 2021Date of Patent: December 20, 2022Assignee: Mazda Motor CorporationInventors: Naoki Itasaka, Hirofumi Ebisumoto
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Patent number: 11326654Abstract: A friction engagement element control system is provided, which includes a friction engagement element including friction plates, which are an input-side friction plate and an output-side friction plate, and an actuation system configured to engage the input-side friction plate with the output-side friction plate with a pushing force, the friction plates having a characteristic in which a friction coefficient thereof decreases as a rotational difference between the friction plates increases. The device includes a controller configured to control the pushing force so that the negative slope characteristic becomes a positive slope characteristic in which a frictional force of the friction engagement element decreases as the rotational difference decreases, when engaging the friction engagement element.Type: GrantFiled: January 20, 2021Date of Patent: May 10, 2022Assignee: Mazda Motor CorporationInventors: Hirofumi Ebisumoto, Nobuhide Seo, Tsukasa Sori
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Patent number: 11320005Abstract: A friction engagement element control system is provided, which includes a friction engagement element including friction plates, and an actuation system configured to engage an input-side friction plate with an output-side friction plate with a pushing force, the friction plates having a negative slope characteristic in which a friction coefficient thereof decreases as a rotational difference between the friction plates increases, a rotational difference sensor of the friction engagement element, a separator configured to divide a variation in the detected rotational difference into a high-frequency component that is a vibration component and other low-frequency components, and a controller configured to control a pushing force only for the vibration component of the rotational difference so that the negative slope characteristic becomes a positive slope characteristic in which a frictional force of the friction engagement element decreases as the rotational difference decreases, when engaging the friction eType: GrantFiled: January 21, 2021Date of Patent: May 3, 2022Assignee: Mazda Motor CorporationInventor: Hirofumi Ebisumoto
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Patent number: 11293497Abstract: The present disclosure provides a wet friction engaging device. The device includes: a plate group engaged with two connecting members and including two groups of friction plates housed in a plate housing chamber and alternately arranged; and a spring attached between a spring plate and an end plate. The plate group is switched between an engaged state in which the friction plates are in close contact with each other, and a disengaged state in which the friction plates are separable from each other. The spring plate is fixed to the end plate.Type: GrantFiled: March 5, 2020Date of Patent: April 5, 2022Assignee: Mazda Motor CorporationInventors: Hirofumi Ebisumoto, Tsukasa Sori
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Patent number: 11226015Abstract: The present disclosure provides a wet friction engaging device. The device includes a plate group engaged with two connecting members and including two groups of friction plates housed in a plate housing chamber and alternately arranged in an axial direction with surfaces facing each other. The plate group is switched between an engaged state in which the friction plates are in close contact with each other, and a disengaged state in which the friction plates are separable from each other. End plates at respective ends of the plate group are kept at a larger distance in the axial direction after a switch to the disengaged state than in the engaged state.Type: GrantFiled: March 5, 2020Date of Patent: January 18, 2022Assignee: Mazda Motor CorporationInventors: Hirofumi Ebisumoto, Tsukasa Sori, Hitoshi Tamegai
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Patent number: 11168745Abstract: The present disclosure provides a wet friction engaging device. The device includes: a plate group engaged with two connecting members and including two groups of friction plates housed in a plate housing chamber and alternately arranged in an axial direction with surfaces facing each other; and a piston configured to apply a pressing force to the plate group. The plate group is switched between an engaged state in which the friction plates are in close contact with each other, and a disengaged state in which the friction plates are separable from each other. One of end plates at respective ends of the plate group is a movable end plate movable in the axial direction, and the other is a stationary end plate immovable in the axial direction. The movable end plate is biased by a spring.Type: GrantFiled: March 5, 2020Date of Patent: November 9, 2021Assignee: Mazda Motor CorporationInventors: Tsukasa Sori, Hirofumi Ebisumoto
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Publication number: 20210285507Abstract: A friction engagement element control system is provided, which includes a friction engagement element including friction plates, and an actuation system configured to engage an input-side friction plate with an output-side friction plate with a pushing force, the friction plates having a negative slope characteristic in which a friction coefficient thereof decreases as a rotational difference between the friction plates increases, a rotational difference sensor of the friction engagement element, a separator configured to divide a variation in the detected rotational difference into a high-frequency component that is a vibration component and other low-frequency components, and a controller configured to control a pushing force only for the vibration component of the rotational difference so that the negative slope characteristic becomes a positive slope characteristic in which a frictional force of the friction engagement element decreases as the rotational difference decreases, when engaging the friction eType: ApplicationFiled: January 21, 2021Publication date: September 16, 2021Inventor: Hirofumi Ebisumoto
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Patent number: 11105382Abstract: A control system for a movable body configured to move by utilizing a motor torque generated by a drive motor, is provided. The system includes the drive motor including a rotor configured to output a rotational force and provided with a variable-magnetic-force magnet, and a stator opposing the rotor with a gap therebetween and provided with a plurality of coils. The device includes a powertrain component provided so as to be associated with the drive motor, and a controller having a magnetization controlling module configured to control magnetizing current flowing through the coils so as to change a magnetic force of the magnet. During a magnetization control in which the magnetic force of the magnet is increased by the magnetization controlling module, the controller operates the powertrain component to suppress an increase in a moving force applied to the movable body due to an increase in the motor torque.Type: GrantFiled: January 20, 2021Date of Patent: August 31, 2021Assignee: Mazda Motor CorporationInventors: Naoki Itasaka, Hirofumi Ebisumoto
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Publication number: 20210254676Abstract: A control system for a movable body configured to move by utilizing a motor torque generated by a drive motor, is provided. The system includes the drive motor including a rotor configured to output a rotational force and provided with a variable-magnetic-force magnet, and a stator opposing the rotor with a gap therebetween and provided with a plurality of coils. The device includes a powertrain component provided so as to be associated with the drive motor, and a controller having a magnetization controlling module configured to control magnetizing current flowing through the coils so as to change a magnetic force of the magnet. During a magnetization control in which the magnetic force of the magnet is increased by the magnetization controlling module, the controller operates the powertrain component to suppress an increase in a moving force applied to the movable body due to an increase in the motor torque.Type: ApplicationFiled: January 20, 2021Publication date: August 19, 2021Inventors: Naoki Itasaka, Hirofumi Ebisumoto
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Publication number: 20210253085Abstract: A control system for a movable body configured to move by utilizing a motor torque generated by a drive motor, is provided. The system includes the drive motor including a rotor configured to output a rotational force and provided with a variable-magnetic-force magnet, and a stator opposing the rotor with a gap therebetween and provided with a plurality of coils, a powertrain component provided so as to be associated with the drive motor, and a controller having a magnetization controlling module configured to control magnetizing current flowing through the coils so as to change a magnetic force of the variable-magnetic-force magnet. During a demagnetization control in which the magnetic force of the variable-magnetic-force magnet is reduced by the magnetization controlling module, the controller operates the powertrain component to suppress a decrease in a moving force applied to the movable body due to a decrease in the motor torque.Type: ApplicationFiled: January 15, 2021Publication date: August 19, 2021Inventors: Naoki Itasaka, Hirofumi Ebisumoto
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Publication number: 20210254672Abstract: A friction engagement element control system is provided, which includes a friction engagement element including friction plates, which are an input-side friction plate and an output-side friction plate, and an actuation system configured to engage the input-side friction plate with the output-side friction plate with a pushing force, the friction plates having a characteristic in which a friction coefficient thereof decreases as a rotational difference between the friction plates increases. The device includes a controller configured to control the pushing force so that the negative slope characteristic becomes a positive slope characteristic in which a frictional force of the friction engagement element decreases as the rotational difference decreases, when engaging the friction engagement element.Type: ApplicationFiled: January 20, 2021Publication date: August 19, 2021Inventors: Hirofumi Ebisumoto, Nobuhide Seo, Tsukasa Sori
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Publication number: 20200378451Abstract: The present disclosure provides a wet friction engaging device. The device includes: a plate group engaged with two connecting members and including two groups of friction plates housed in a plate housing chamber and alternately arranged in an axial direction with surfaces facing each other; and a piston configured to apply a pressing force to the plate group. The plate group is switched between an engaged state in which the friction plates are in close contact with each other, and a disengaged state in which the friction plates are separable from each other. One of end plates at respective ends of the plate group is a movable end plate movable in the axial direction, and the other is a stationary end plate immovable in the axial direction. The movable end plate is biased by a spring.Type: ApplicationFiled: March 5, 2020Publication date: December 3, 2020Inventors: Tsukasa SORI, Hirofumi EBISUMOTO
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Publication number: 20200378452Abstract: The present disclosure provides a wet friction engaging device. The device includes a plate group engaged with two connecting members and including two groups of friction plates housed in a plate housing chamber and alternately arranged in an axial direction with surfaces facing each other. The plate group is switched between an engaged state in which the friction plates are in close contact with each other, and a disengaged state in which the friction plates are separable from each other. End plates at respective ends of the plate group are kept at a larger distance in the axial direction after a switch to the disengaged state than in the engaged state.Type: ApplicationFiled: March 5, 2020Publication date: December 3, 2020Inventors: Hirofumi EBISUMOTO, Tsukasa SORI, Hitoshi TAMEGAI
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Publication number: 20200378449Abstract: The present disclosure provides a wet friction engaging device. The device includes: a plate group engaged with two connecting members and including two groups of friction plates housed in a plate housing chamber and alternately arranged; and a spring attached between a spring plate and an end plate. The plate group is switched between an engaged state in which the friction plates are in close contact with each other, and a disengaged state in which the friction plates are separable from each other. The spring plate is fixed to the end plate.Type: ApplicationFiled: March 5, 2020Publication date: December 3, 2020Inventors: Hirofumi EBISUMOTO, Tsukasa SORI
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Patent number: 8612073Abstract: In an electric vehicle inverter apparatus 100, a vehicle control controller 15 detects a switch open signal output from a collision detector 16 when the collision detector 16 is caused by a collision between electric vehicles to operate. Then, an inverter main circuit connection switch 10 of a high-voltage battery unit 8 is put into an open state. Thus, the direct-current power supply from a high-voltage battery 12 to a DC bus portion is interrupted. In addition, electric charges charged into a main circuit capacitor 7 are discharged by a forced discharge circuit portion 22b.Type: GrantFiled: February 19, 2010Date of Patent: December 17, 2013Assignees: Kabushiki Kaisha Yaskawa Denki, Mazda Motor CorporationInventors: Kiyotaka Fuji, Hidenori Hara, Kenji Yamada, Yoshinori Tanaka, Akihiro Furukawa, Hirofumi Ebisumoto, Kei Yonemori, Nobuhide Seo, Ryuichiro Amano
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Publication number: 20100214055Abstract: In an electric vehicle inverter apparatus 100, a vehicle control controller 15 detects a switch open signal output from a collision detector 16 when the collision detector 16 is caused by a collision between electric vehicles to operate. Then, an inverter main circuit connection switch 10 of a high-voltage battery unit 8 is put into an open state. Thus, the direct-current power supply from a high-voltage battery 12 to a DC bus portion is interrupted. In addition, electric charges charged into a main circuit capacitor 7 are discharged by a forced discharge circuit portion 22b.Type: ApplicationFiled: February 19, 2010Publication date: August 26, 2010Applicants: KABUSHIKI KAISHA YASKAWA DENKI, MAZDA MOTOR CORPORATIONInventors: Kiyotaka FUJI, Hidenori HARA, Kenji YAMADA, Yoshinori TANAKA, Akihiro FURUKAWA, Hirofumi EBISUMOTO, Kei YONEMORI, Nobuhide SEO, Ryuichiro AMANO
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MOTOR CONTROL METHOD FOR ELECTRIC-POWERED VEHICLE AND DRIVING APPARATUS FOR ELECTRIC-POWERED VEHICLE
Publication number: 20100082191Abstract: Disclosed is a motor control method for an electric-powered vehicle (1), which is designed to switch an output characteristic of an electric motor (5) for rotatably driving a driving wheel (16) of the vehicle (1), between a low-speed mode adaptable to a relatively low rotation speed operation region and a high-speed mode adaptable to a relatively high rotation speed operation region, on the basis of a given switching rotation speed (Nt) as a threshold.Type: ApplicationFiled: August 26, 2009Publication date: April 1, 2010Applicant: MAZDA MOTOR CORPORATIONInventors: Nobuhide SEO, Kei YONEMORI, Ryuichiro AMANO, Hirofumi EBISUMOTO