Patents by Inventor Kazuhito Hayashi
Kazuhito Hayashi 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: 20140139156Abstract: An ECU sets target value of a system voltage based on an electric power loss of a motor generator and an inverter and controls a voltage boost converter. The ECU calculates the target value of the system voltage using a function expression generated, for each operating point of the motor generator, by approximating a loss characteristic which represents change of the electric power loss with respect to change of the system voltage, by a quadratic expression or a linear expression of the system voltage.Type: ApplicationFiled: June 30, 2011Publication date: May 22, 2014Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Kazuhito Hayashi, Hideto Hanada
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Patent number: 8581533Abstract: A controller controls switching of IGBT devices of an inverter according to the desired output of the permanent magnet motor. The controller includes: a magnet temperature detection device that detects the magnet temperature of the permanent magnet motor based on the output of a temperature sensor; a setting device that sets a threshold value of the magnet temperature corresponding to the desired output of the permanent magnet motor, based on a predetermined relation between the output from the permanent magnet motor and a critical temperature, up to which demagnetization in the permanent magnet motor is not caused; and a carrier frequency control device that, when the magnet temperature detected by the magnet temperature detection device exceeds the threshold value, changes the carrier frequency, at which the IGBT devices are switched, such that a ripple current superimposed on a motor current that flows through the permanent magnet motor is reduced.Type: GrantFiled: October 8, 2009Date of Patent: November 12, 2013Assignee: Toyota Jidosha Kabushiki KaishaInventors: Kazuhito Hayashi, Masayoshi Suhama
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Publication number: 20130253749Abstract: A hybrid vehicle generates vehicle driving force by the sum of a direct torque mechanically transmitted directly from an engine to a drive shaft through a power split device and an output torque of an MG. A PM-ECU selectively applies a running mode in which outputs of the engine and the MG are controlled such that the requested driving force for the entire vehicle is exerted on the drive shaft; and an S/D mode in which the requested driving force is exerted on the drive shaft by the direct torque in the state where the output torque of the MG is set at zero. An MG-ECU stops the operation of a power converter for controlling the output of the MG when the S/D mode is applied.Type: ApplicationFiled: December 27, 2010Publication date: September 26, 2013Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Kazuhito Hayashi, Mikio Yamazaki, Kazunobu Eritate
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Patent number: 8482234Abstract: A motor drive control device includes a battery, a converter, an inverter, and a control section for outputting control signals to the converter and the inverter. The control section has a first map and a second map regarding control of the alternating-current motor and further includes a map switching section for switching from control based on the first map to control based on the second map in accordance with conditions of the battery.Type: GrantFiled: January 23, 2009Date of Patent: July 9, 2013Assignee: Toyota Jidosha Kabushiki KaishaInventors: Toshifumi Yamakawa, Hideto Hanada, Kazuhito Hayashi, Masayoshi Suhama
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Patent number: 8454075Abstract: A front portion structure of a saddle-ride type vehicle which is constructed to install a combination lamp on a front cowl and improve visibility of a blinker of one of left and right sides of the vehicle from the other side, wherein Lens-side recess portions are formed as concavities which are recessed to the rear of the vehicle and extend in a vertical direction in front of the blinker lamps as well as on the inner side of a vehicle width direction.Type: GrantFiled: February 25, 2011Date of Patent: June 4, 2013Assignee: Honda Motor Co., Ltd.Inventors: Kazuhito Hayashi, Hirotsugu Ueno, Hiroaki Tsukui, Manabu Ichikawa, Takahiro Oyama
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Patent number: 8395277Abstract: A vehicle includes a converter for stepping up power provided from a power storage device, and an inverter for converting the power output from converter and outputting it to an alternating-current motor for driving the vehicle. In the vehicle, a rectangular voltage control unit controls the inverter by means of rectangular wave voltage control that is based on a torque command value and the like, so as to control an output torque of the alternating-current motor. A system voltage control unit controls a system voltage, which is an output voltage of the converter. The system voltage control unit lifts a restriction on a system voltage command value based on an accelerator pedal position and the like, and then increases it. When increasing the system voltage command value during the rectangular wave voltage control for the inverter, a cooperative control unit increases the system voltage command value and the torque command value in a cooperative manner.Type: GrantFiled: December 22, 2008Date of Patent: March 12, 2013Assignee: Toyota Jidosha Kabushiki KaishaInventors: Toshifumi Yamakawa, Hideto Hanada, Kazuhito Hayashi, Masayoshi Suhama, Toshiya Hashimoto
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Patent number: 8387732Abstract: A power output apparatus including a power source, an electric motor and a connecting and disconnecting device, and a method of controlling the power output apparatus, are provided. When load driving force is applied from the power source to a power shaft in a condition where the power shaft and a driveshaft are disconnected from each other by the connecting and disconnecting device, lock control is executed to control the motor by fixing a direction of a magnetic field of a stator so as to restrict rotation of a rotor. When the rotor rotates during execution of the lock control, rotation retardation control is executed to control the motor by rotating the direction of the stator magnetic field in accordance with rotation of the rotor, so that driving force is applied from the motor to the power shaft in a direction opposite to that of the load driving force as driving force applied from the power source to the power shaft.Type: GrantFiled: June 18, 2009Date of Patent: March 5, 2013Assignee: Toyota Jidosha Kabushiki KaishaInventors: Masaki Okamura, Kazuhito Hayashi
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Patent number: 8373380Abstract: A device for controlling an alternating-current motor includes a resolver for detecting a rotational position of an alternating-current motor; and a rectangular wave voltage control unit for performing control based on an output of the resolver to provide a rectangular wave voltage to each phase of the alternating-current motor. The control unit causes an amount of change ?? in a voltage phase of the rectangular wave voltage of each phase from a switching reference phase of each phase to increase or decrease equally for each switching in one cycle of an electrical angle determined based on the output of the resolver. In this way, a device for controlling an alternating-current motor is provided to restrain occurrence of an offset current upon rectangular wave voltage control.Type: GrantFiled: September 29, 2008Date of Patent: February 12, 2013Assignee: Toyota Jidosha Kabushiki KaishaInventor: Kazuhito Hayashi
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Patent number: 8324856Abstract: In the hybrid vehicle, a boost converter is controlled to make a post-boost voltage or a voltage on the side of an inverter become a target post-boost voltage corresponding to a target operation point of a motor in accordance with a target post-boost voltage setting map that divides an operation region of the motor into a non-boost region and a boost region when a operation point of the motor is included in the boost region. The target post-boost voltage setting map is prepared so that the non-boost region includes a region in which a loss produced by driving the motor when not boosting the post-boost voltages becomes smaller than the loss produced when boosting the post-boost voltage and the boost region includes a region in which the loss produced when boosting the post-boost voltage becomes smaller than the loss produced when not boosting the post-boost voltage.Type: GrantFiled: December 19, 2008Date of Patent: December 4, 2012Assignee: Toyota Jidosha Kabushiki KaishaInventors: Toshifumi Yamakawa, Hideto Hanada, Kazuhito Hayashi, Masayoshi Suhama, Masaki Okamura
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Patent number: 8215425Abstract: In response to a starting instruction of an engine 22 at a gearshift position of a gearshift lever 81 set to a parking position, the engine 22 and motors MG1 and MG2 are controlled to motor and start the engine 22 with output of a torque from the motor MG2 to keep a rotational position of a rotor in the motor MG2 at a preset reference position. This arrangement enables the engine 22 to be motored and started even in the state of separation of a ring gear shaft 32a from a driveshaft 36 by means of a transmission 60 and locking of drive wheels 39a and 39b by means of a parking lock mechanism 90.Type: GrantFiled: February 23, 2007Date of Patent: July 10, 2012Assignee: Toyota Jidosha Kabushiki KaishaInventors: Kazuhito Hayashi, Masaki Okamura, Hideto Hanada
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Patent number: 8172050Abstract: A disc brake cover structure for a vehicle includes a protection cover and a wheel collar. The protection cover is to protect a rotor of a disc brake disposed at a front wheel of a vehicle. The front wheel is rotatably supported via a support shaft between first and second axle holders disposed at a front fork. A wheel collar is to be supported on the support shaft to position the front wheel and connected to the protection cover. The wheel collar is arranged to be sandwiched between a hub of the front wheel and either one of the first and second axle holders.Type: GrantFiled: March 11, 2009Date of Patent: May 8, 2012Assignee: Honda Motor Co., Ltd.Inventors: Keita Mikura, Tomohiro Fuse, Kazuhito Hayashi
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Patent number: 8089241Abstract: When a target operation point of either a motor MG1 or a motor MG2 is included in a resonance range specified by operation points of the motor MG1 or the motor MG2 in the occurrence of resonance in a booster converter, a hybrid vehicle controls the booster converter to make the voltage on the side of inverters approach to a preset target boosted voltage that is higher than the voltage on the side of the battery, while controlling the inverters by sine-wave control.Type: GrantFiled: March 16, 2009Date of Patent: January 3, 2012Assignee: Toyota Jidosha Kabushiki KaishaInventors: Toshifumi Yamakawa, Kazuhito Hayashi, Masayoshi Suhama, Hideto Hanada
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Patent number: 8016307Abstract: A fender supporting structure of a two-wheeled motor vehicle capable of securing the rigidity of a mounting portion of a front fender and the rigidity of the entire front fender is provided, without enlarging the outer shape of the front fender more than necessary. In a fender supporting structure of a two-wheeled motor vehicle including a fender formed in an arc shape along the shape of a wheel, and a fender supporting member on which the fender is mounted from under the fender supporting member so as to cover an area above the wheel, at least two mounting surfaces at different levels in height are formed on the fender, at least two mounting surfaces at different levels in height are formed on the fender supporting member, and the fender is joined to the fender supporting member with these mounting surfaces.Type: GrantFiled: February 28, 2008Date of Patent: September 13, 2011Assignee: Honda Motor Co., Ltd.Inventors: Eiji Adachi, Yuichi Kato, Daisuke Soeno, Yuji Noguchi, Tomohiro Fuse, Kazuhito Hayashi
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Publication number: 20110193506Abstract: A controller controls switching of IGBT devices of an inverter according to the desired output of the permanent magnet motor. The controller includes: a magnet temperature detection device that detects the magnet temperature of the permanent magnet motor based on the output of a temperature sensor; a setting device that sets a threshold value of the magnet temperature corresponding to the desired output of the permanent magnet motor, based on a predetermined relation between the output from the permanent magnet motor and a critical temperature, up to which demagnetization in the permanent magnet motor is not caused; and a carrier frequency control device that, when the magnet temperature detected by the magnet temperature detection device exceeds the threshold value, changes the carrier frequency, at which the IGBT devices are switched, such that a ripple current superimposed on a motor current that flows through the permanent magnet motor is reduced.Type: ApplicationFiled: October 8, 2009Publication date: August 11, 2011Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Kazuhito Hayashi, Masayoshi Suhama
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Publication number: 20110149587Abstract: To provide a front portion structure of a saddle-ride type vehicle which is constructed to install a combination lamp on a front cowl and improves visibility of a blinker of one of left and right sides of the vehicle from the other side. Lens-side recess portions are formed as concavities which are recessed to the rear of the vehicle and extend in a vertical direction in front of the blinker lamps as well as on the inner side of a vehicle width direction.Type: ApplicationFiled: February 25, 2011Publication date: June 23, 2011Inventors: Kazuhito HAYASHI, Hirotsugu UENO, Hiroaki TSUKUI, Manabu ICHIKAWA, Takahiro OYAMA
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Publication number: 20110148149Abstract: A front portion structure of a saddle-ride type vehicle capable of avoiding restrictions of a headlight and performing a sufficient air guide. A lens of the headlight is provided with lens-side recess portions recessed toward the rear of the vehicle. The recess portions are provided so as to continue to lower open ends of a gap between the front cowl and a windscreen.Type: ApplicationFiled: December 15, 2010Publication date: June 23, 2011Applicant: HONDA MOTOR CO., LTD.Inventors: Kazuhito HAYASHI, Hirotsugu UENO, Hiroaki TSUKUI, Manabu ICHIKAWA, Takahiro OYAMA
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Patent number: 7892140Abstract: In response to a change of a gearshift position from a parking position to a driving position, the control system of the invention connects a power shaft with a driveshaft linked to drive wheels (steps S310 and S380), while performing rotation restriction control to form a fixed magnetic field on a stator of a second motor and thereby prohibit rotation of a rotor in the second motor (step S300). This arrangement desirably restrains rotation of the power shaft and accordingly prevents the occurrence of a shock in the course of connection of the power shaft with an axle.Type: GrantFiled: September 11, 2007Date of Patent: February 22, 2011Assignee: Toyota Jidosha Kabushiki KaishaInventors: Shinichi Sugai, Kazuhito Hayashi
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Publication number: 20110006598Abstract: A vehicle includes a converter for stepping up power provided from a power storage device, and an inverter for converting the power output from converter and outputting it to an alternating-current motor for driving the vehicle. In the vehicle, a rectangular voltage control unit controls the inverter by means of rectangular wave voltage control that is based on a torque command value and the like, so as to control an output torque of the alternating-current motor. A system voltage control unit controls a system voltage, which is an output voltage of the converter. The system voltage control unit lifts a restriction on a system voltage command value based on an accelerator pedal position and the like, and then increases it. When increasing the system voltage command value during the rectangular wave voltage control for the inverter, a cooperative control unit increases the system voltage command value and the torque command value in a cooperative manner.Type: ApplicationFiled: December 22, 2008Publication date: January 13, 2011Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Toshifumi Yamakawa, Hideto Hanada, Kazuhito Hayashi, Masayoshi Suhama, Toshiya Hashimoto
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Publication number: 20110006723Abstract: In the hybrid vehicle, a boost converter is controlled to make a post-boost voltage or a voltage on the side of an inverter become a target post-boost voltage corresponding to a target operation point of a motor in accordance with a target post-boost voltage setting map that divides an operation region of the motor into a non-boost region and a boost region when a operation point of the motor is included in the boost region. The target post-boost voltage setting map is prepared so that the non-boost region includes a region in which a loss produced by driving the motor when not boosting the post-boost voltages becomes smaller than the loss produced when boosting the post-boost voltage and the boost region includes a region in which the loss produced when boosting the post-boost voltage becomes smaller than the loss produced when not boosting the post-boost voltage.Type: ApplicationFiled: December 19, 2008Publication date: January 13, 2011Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Toshifumi Yamakawa, Hideto Hanada, Kazuhito Hayashi, Masayoshi Suhama, Masaki Okamura
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Publication number: 20100270955Abstract: There is provided a motor drive control device which allows an improvement in fuel efficiency in terms of electric power while preventing the battery voltage from falling below the lower limit as rectangular wave control is performed. A motor drive control device 10 includes a battery B, a converter 12, an inverter 16, and a control section 20 for outputting control signals to the converter 12 and the inverter 16. The control section 20 has a first map and a second map regarding control of the alternating-current motor. The first map is a map in which a step-up starting point of the converter 12 is set in a higher revolution range than that in the second map, and which thus includes a relatively large rectangular wave control region a3, and the second map is a map for mainly performing pulse width modulation control.Type: ApplicationFiled: January 23, 2009Publication date: October 28, 2010Applicant: Toyota Jidosha Kabushiki KaishaInventors: Toshifumi Yamakawa, Hideto Hanada, Kazuhito Hayashi, Masayoshi Suhama