Patents by Inventor Yasunori Nakawaki

Yasunori Nakawaki 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).

  • Patent number: 7806790
    Abstract: A slippage detection system for a continuously variable transmission capable of continuously changing a ratio between a speed of rotation of an input member and a speed of rotation of an output member is provided. The slippage detection system calculates a correlation coefficient relating to the input rotation speed and the output rotation speed, based on a plurality of measurement values of the input rotation speed and a plurality of measurement values of the output rotation speed, and determines slippage of the torque transmitting member in the continuously variable transmission based on the calculated correlation coefficient.
    Type: Grant
    Filed: September 30, 2002
    Date of Patent: October 5, 2010
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Kunihiro Iwatsuki, Kazumi Hoshiya, Yasuhiro Oshiumi, Yasunori Nakawaki, Masataka Osawa, Hiroyuki Nishizawa, Hiroyuki Yamaguchi, Hideyuki Suzuki
  • Publication number: 20100197454
    Abstract: A slippage detection system for a continuously variable transmission capable of continuously changing a gear ratio between an input rotation speed of an input member and an output rotation speed of an output member is provided. The slippage detection system compares a difference between an actual gear ratio calculated from measurement values of the input rotation speed and the output rotation speed and a target gear ratio with a predetermined reference value, and determines slippage in the continuously variable transmission when the difference exceeds the reference value at least a predetermined number of times in a predetermined period of time.
    Type: Application
    Filed: April 16, 2010
    Publication date: August 5, 2010
    Applicant: Toyota Jidosha Kabushiki Kaisha
    Inventors: Kunihiro IWATSUKI, Kazumi Hoshiya, Yasuhiro Oshiumi, Yasunori Nakawaki, Hiroyuki Yamaguchi, Hiroyuki Nishizawa, Hideyuki Suzuki, Masataka Osawa
  • Publication number: 20100197455
    Abstract: A slippage detection system for a continuously variable transmission capable of continuously changing a gear ratio between an input rotation speed of an input member and an output rotation speed of an output member is provided. The slippage detection system calculate a sum of differences between an actual gear ratio calculated from measurement values of the input rotation speed and the output rotation speed and a target gear ratio over a predetermined period of time, and determines slippage in the continuously variable transmission based on the sum of differences.
    Type: Application
    Filed: April 16, 2010
    Publication date: August 5, 2010
    Applicant: Toyota Jidosha Kabushiki Kaisha
    Inventors: Kunihiro Iwatsuki, Kazumi Hoshiya, Yasuhiro Oshiumi, Yasunori Nakawaki, Hiroyuki Yamaguchi, Hiroyuki Nishizawa, Hideyuki Suzuki, Masataka Osawa
  • Patent number: 7666110
    Abstract: A control system of a power transmission mechanism, in which a transmission torque capacity between transmission members varies according to a pressure to be applied to the transmission members and in which the pressure to be applied to the transmission members is controlled on the basis of such a slip condition between the transmission members as accompanies the lowering of the pressure. The control system comprises: a pressure lowering device for lowering the pressure by a preset value; and a pressure setter for setting the pressure, in case the slip between the transmission members is not detected even by lowering the pressure by a preset value with the pressure lowering device, on the basis of the lowered minimum value of the pressure.
    Type: Grant
    Filed: March 11, 2004
    Date of Patent: February 23, 2010
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Kunihiro Iwatsuki, Yasunori Nakawaki, Yasuhiro Oshiumi, Kazumi Hoshiya, Takayuki Amaya
  • Patent number: 7267211
    Abstract: In a damper device of a lock-up clutch-equipped torque converter which has at least two rotating members that have a common rotation axis and are rotatable relatively to each other via an elastic member, an axial-direction support portion that supports the at least two rotating members in the direction of the rotation axis with respect to each other, and a radial-direction support portion that supports the rotating members in a radial direction with respect to each other are disposed on circumferences that are substantially equidistant from the rotation axis.
    Type: Grant
    Filed: March 5, 2004
    Date of Patent: September 11, 2007
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Toshiya Yamashita, Ryuji Ibaraki, Hiroyuki Shioiri, Hiroaki Kimura, Yasunori Nakawaki
  • Patent number: 7188717
    Abstract: A control apparatus for a power train including a continuously variable transmission and a clutch arranged in series with the continuously variable transmission is provided in which an engaging pressure of the clutch is first reduced until a slip occurs, and is then increased after detection of the slip so as to re-engage the clutch, and an engaging pressure of the clutch to be established is calculated by giving an excess pressure to the engaging pressure at which the clutch is re-engaged, such that an excess amount of the transmitted torque of the clutch is set smaller than that of the continuously variable transmission. The control apparatus is adapted to determine a learned value as a correction value of the engaging pressure that is set in advance in accordance with an input torque applied to the clutch, based on the engaging pressure calculated by giving the excess pressure to the engaging pressure at which the clutch is re-engaged.
    Type: Grant
    Filed: April 27, 2005
    Date of Patent: March 13, 2007
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Kazumi Hoshiya, Yasunori Nakawaki, Kunihiro Iwatsuki, Yasuhiro Oshiumi
  • Patent number: 6991581
    Abstract: A control device for a hybrid vehicle, which has; a first prime mover and a second prime mover for transmitting a power to a wheel; a power distribution device for distributing the power of said first prime mover to the wheel and to a rotary device; a transmission arranged on a power transmission route from said second prime mover to the wheel; and a gear ratio control device for controlling a gear ratio of the transmission; characterized in that comprising a sub control device for controlling a status of said transmission to enable suppression of decline in a driving performance of the vehicle, even when the function of said gear ratio control mechanism declines.
    Type: Grant
    Filed: February 20, 2004
    Date of Patent: January 31, 2006
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Akira Murakami, Yasunori Nakawaki, Makoto Funahashi, Masahiro Kojima, Masatoshi Adachi
  • Patent number: 6974009
    Abstract: A control apparatus for a power train including a continuously variable transmission and a clutch arranged in series with the continuously variable transmission is provided in which an engaging pressure of the clutch is first reduced until a slip occurs, and is then increased after detection of the slip so as to re-engage the clutch, and an engaging pressure of the clutch to be established is calculated by giving an excess pressure to the engaging pressure at which the clutch is re-engaged, such that an excess amount of the transmitted torque of the clutch is set smaller than that of the continuously variable transmission. The control apparatus is adapted to determine a learned value as a correction value of the engaging pressure that is set in advance in accordance with an input torque applied to the clutch, based on the engaging pressure calculated by giving the excess pressure to the engaging pressure at which the clutch is re-engaged.
    Type: Grant
    Filed: February 3, 2003
    Date of Patent: December 13, 2005
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Kazumi Hoshiya, Yasunori Nakawaki, Kunihiro Iwatsuki, Yasuhiro Oshiumi
  • Publication number: 20050197233
    Abstract: A control apparatus for a power train including a continuously variable transmission and a clutch arranged in series with the continuously variable transmission is provided in which an engaging pressure of the clutch is first reduced until a slip occurs, and is then increased after detection of the slip so as to re-engage the clutch, and an engaging pressure of the clutch to be established is calculated by giving an excess pressure to the engaging pressure at which the clutch is re-engaged, such that an excess amount of the transmitted torque of the clutch is set smaller than that of the continuously variable transmission. The control apparatus is adapted to determine a learned value as a correction value of the engaging pressure that is set in advance in accordance with an input torque applied to the clutch, based on the engaging pressure calculated by giving the excess pressure to the engaging pressure at which the clutch is re-engaged.
    Type: Application
    Filed: April 27, 2005
    Publication date: September 8, 2005
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Kazumi Hoshiya, Yasunori Nakawaki, Kunihiro Iwatsuki, Yasuhiro Oshiumi
  • Publication number: 20040242370
    Abstract: A control system of a power transmission mechanism, in which a transmission torque capacity between transmission members varies according to a pressure to be applied to the transmission members and in which the pressure to be applied to the transmission members is controlled on the basis of such a slip condition between the transmission members as accompanies the lowering of the pressure. The control system comprises: a pressure lowering device for lowering the pressure by a preset value; and a pressure setter for setting the pressure, in case the slip between the transmission members is not detected even by lowering the pressure by a preset value with the pressure lowering device, on the basis of the lowered minimum value of the pressure.
    Type: Application
    Filed: March 11, 2004
    Publication date: December 2, 2004
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Kunihiro Iwatsuki, Yasunori Nakawaki, Yasuhiro Oshiumi, Kazumi Hoshiya, Takayuki Amaya
  • Publication number: 20040216979
    Abstract: In a damper device of a lock-up clutch-equipped torque converter which has at least two rotating members that have a common rotation axis and are rotatable relatively to each other via an elastic member, an axial-direction support portion that supports the at least two rotating members in the direction of the rotation axis with respect to each other, and a radial-direction support portion that supports the rotating members in a radial direction with respect to each other are disposed on circumferences that are substantially equidistant from the rotation axis.
    Type: Application
    Filed: March 5, 2004
    Publication date: November 4, 2004
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Toshiya Yamashita, Ryuji Ibaraki, Hiroyuki Shioiri, Hiroaki Kimura, Yasunori Nakawaki
  • Publication number: 20040220015
    Abstract: A control device for a hybrid vehicle, which has; a first prime mover and a second prime mover for transmitting a power to a wheel; a power distribution device for distributing the power of said first prime mover to the wheel and to a rotary device; a transmission arranged on a power transmission route from said second prime mover to the wheel; and a gear ratio control device for controlling a gear ratio of the transmission; characterized in that comprising a sub control device for controlling a status of said transmission to enable suppression of decline in a driving performance of the vehicle, even when the function of said gear ratio control mechanism declines.
    Type: Application
    Filed: February 20, 2004
    Publication date: November 4, 2004
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Akira Murakami, Yasunori Nakawaki, Makoto Funahashi, Masahiro Kojima, Masatoshi Adachi
  • Publication number: 20030150683
    Abstract: A control apparatus for a power train including a continuously variable transmission and a clutch arranged in series with the continuously variable transmission is provided in which an engaging pressure of the clutch is first reduced until a slip occurs, and is then increased after detection of the slip so as to re-engage the clutch, and an engaging pressure of the clutch to be established is calculated by giving an excess pressure to the engaging pressure at which the clutch is re-engaged, such that an excess amount of the transmitted torque of the clutch is set smaller than that of the continuously variable transmission. The control apparatus is adapted to determine a learned value as a correction value of the engaging pressure that is set in advance in accordance with an input torque applied to the clutch, based on the engaging pressure calculated by giving the excess pressure to the engaging pressure at which the clutch is re-engaged.
    Type: Application
    Filed: February 3, 2003
    Publication date: August 14, 2003
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Kazumi Hoshiya, Yasunori Nakawaki, Kunihiro Iwatsuki, Yasuhiro Oshiumi
  • Publication number: 20030069682
    Abstract: A control apparatus for controlling a drive mechanism including a continuously variable transmission and a clutch device torque capacities of which are variable and which are disposed in series with each other between a drive power source and drive wheel, the control apparatus including a clutch-torque-capacity adjusting portion for adjusting the torque capacity of the clutch device such that the clutch device is capable of transmitting an output torque of the drive power source, without a slipping action of the clutch device, and a transmission-torque-capacity adjusting portion for adjusting the torque capacity of the continuously variable transmission after the torque capacity of the clutch device has been adjusted by the clutch-torque-capacity adjusting means, such that the continuously variable transmission is operable without a slipping action thereof.
    Type: Application
    Filed: October 4, 2002
    Publication date: April 10, 2003
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Kunihiro Iwatsuki, Yasunori Nakawaki, Kazumi Hoshiya
  • Publication number: 20020155910
    Abstract: A thrust ratio calculation section 50 calculates a thrust ratio based on driving pulley thrust from a driving pulley thrust calculation section 44 and following pulley thrust from a following pulley thrust calculation section 48. A thrust ratio state of change identifying section 52 detects a peak of a thrust ratio caused by changing of the following pulley thrust, based on the thrust ratio and the following pulley thrust. The following pulley thrust is maintained such that the thrust ratio remains at the peak. This enables appropriate control of the pulley thrust.
    Type: Application
    Filed: March 1, 2002
    Publication date: October 24, 2002
    Applicant: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO
    Inventors: Hiroyuki Nishizawa, Hiroyuki Yamaguchi, Hideyuki Suzuki, Masatoshi Hada, Ichiro Tarutani, Masataka Osawa, Yuji Nagasawa, Kunihiro Iwatuki, Yasunori Nakawaki, Kazumi Hoshiya, Yasuhiro Oshiumi
  • Patent number: 5964335
    Abstract: A parking control mechanism to prevent generation of noise and shock when a parking range is released after a vehicle has been parked so that a driver does not feel uncomfortable. A parking apparatus of an automatic transmission has a parking gear; a parking pole swingably disposed and provided with a claw arranged to selectively be engaged with a tooth space of the parking gear; an engagement inhibition device movably disposed and arranged to be moved to an inhibition position for inhibiting engagement between the claw and the tooth space and to an inhibition release position for releasing the inhibition of the engagement; and an engagement inhibition release device for moving the engagement inhibition device to the inhibition release position in synchronization with the rotation of the parking gear. After a residual torque existing between the parking gear and drive wheels has been released, the claw and the tooth space are engaged with each other.
    Type: Grant
    Filed: September 11, 1998
    Date of Patent: October 12, 1999
    Assignees: Aisin AW Co., Ltd., Toyota Jidosha Kabushiki Kaisha
    Inventors: Takao Taniguchi, Kazumasa Tsukamoto, Fumitomo Yokoyama, Kazuhisa Ozaki, Akihiro Kuroyanagi, Akihito Hongoya, Yasuo Hojo, Shoichi Sayo, Kagenori Fukumura, Yasunori Nakawaki, Atsushi Tabata, Yasunari Nakamura, Nobuaki Takahashi, Hideki Miyata
  • Patent number: 5954177
    Abstract: An oil seal member is compressed between a connecting pipe for supplying oil to an oil chamber of a hydraulic servo and the cylinder drum of the hydraulic servo. The cylinder drum has an interior oil chamber and turns through a predetermined angle upon operation of a frictional engagement element by the hydraulic servo. The end of the seal member pressed against the cylindrical drum surrounds an oil hole 73 formed in the cylindrical drum, and oil pressure is supplied to the oil chamber through an oil passage in which the seal member is mounted and through the oil hole. A recess is formed in the outer surface of the cylindrical drum around the oil hole and the end of the seal member is received in the recess. When the cylindrical member turns within the predetermined angular range, the end of the seal member is protected by the recess. As a result, the end of the seal member is not damaged and the integrity of the seal is protected.
    Type: Grant
    Filed: December 23, 1997
    Date of Patent: September 21, 1999
    Assignees: Aisin AW Co., Ltd., Nok Corporation
    Inventors: Fumitomo Yokoyama, Kazuhisa Ozaki, Masanori Kadotani, Mikio Iwase, Harumichi Tsuboi, Makoto Hijikata, Yasuo Hojo, Atsushi Tabata, Yasunori Nakawaki, Yasunari Nakamura, Nobuaki Takahashi, Hideki Miyata, Kagenori Fukumura, Koji Tsukamoto
  • Patent number: 5797108
    Abstract: Disclosed is a slip detecting device for a motor vehicle mounted with an automatic transmission. The slip detecting device is provided with a device for detecting a rotational speed of the specific part in a driving system, whereby occurrence of a driving wheel slip is detected based on the speed variation state in the rotational speed such as the gradient of variation in the output shaft rotational speed when shifting. Therefore, a driving wheel slip can be detected at a low cost, regardless of the accelerator pressed condition.
    Type: Grant
    Filed: August 24, 1995
    Date of Patent: August 18, 1998
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Hideaki Otsubo, Yasunori Nakawaki
  • Patent number: 5758305
    Abstract: In order to correctly detect the frictional state of a running road surface, the running road surface is determined as a low-friction road surface, when tire lock is detected by tire lock detection device, and besides a state in which vehicle deceleration obtained by vehicle deceleration detection means is greater than a predetermined value, is shorter than a predetermined time in a period extending from the start of braking until the tire lock.
    Type: Grant
    Filed: October 20, 1995
    Date of Patent: May 26, 1998
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Hideaki Otsubo, Yasunori Nakawaki
  • Patent number: 5679092
    Abstract: A gear-shift control system of an automatic transmission, in which gear shift schedule is appropriately changed-over in correspondence with the change of a road surface situation. Low-friction road surface detection device detects a low-friction road surface so as to select the gear shift schedule for the low-friction road surface adopted to start the motor vehicle with second gear. After the selection, a holding device holds the gear shift schedule for the low-friction road surface until an accelerator is pressed next.
    Type: Grant
    Filed: October 5, 1995
    Date of Patent: October 21, 1997
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Hideaki Otsubo, Yasunori Nakawaki