Patents by Inventor Youhei Ishikawa

Youhei Ishikawa 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: 10323744
    Abstract: Control device for continuously variable transmission (4) with auxiliary transmission having variator (20); hydraulic pressure control circuit (11) having primary pressure solenoid (11b); and transmission ratio controller (12) controlling the transmission ratio of variator (20) by feedback control. The transmission ratio controller (12) has a high limiter control unit (FIG. 5) that, when receiving a high transmission ratio limiting request, performs a high limiter control that limits the transmission ratio to a High limit line. The transmission ratio controller (12) also has a primary pressure lower limit regulation control unit (FIG. 4) that, when operation of the high limiter control is started during a time period when the transmission ratio is present at a High transmission ratio side with respect to the high limit transmission ratio, regulates a decrease of a primary command pressure to the primary pressure solenoid up to a High limiter-operated final target primary lower limit pressure.
    Type: Grant
    Filed: December 16, 2015
    Date of Patent: June 18, 2019
    Assignee: JATCO LTD
    Inventors: Tomoyuki Suwabe, Shin Tsukamoto, Youhei Ishikawa
  • Publication number: 20180073634
    Abstract: Control device for continuously variable transmission (4) with auxiliary transmission having variator (20); hydraulic pressure control circuit (11) having primary pressure solenoid (11b); and transmission ratio controller (12) controlling the transmission ratio of variator (20) by feedback control. The transmission ratio controller (12) has a high limiter control unit (FIG. 5) that, when receiving a high transmission ratio limiting request, performs a high limiter control that limits the transmission ratio to a High limit line. The transmission ratio controller (12) also has a primary pressure lower limit regulation control unit (FIG. 4) that, when operation of the high limiter control is started during a time period when the transmission ratio is present at a High transmission ratio side with respect to the high limit transmission ratio, regulates a decrease of a primary command pressure to the primary pressure solenoid up to a High limiter-operated final target primary lower limit pressure.
    Type: Application
    Filed: December 16, 2015
    Publication date: March 15, 2018
    Applicant: JATCO Ltd
    Inventors: Tomoyuki SUWABE, Shin TSUKAMOTO, Youhei ISHIKAWA
  • Patent number: 9087505
    Abstract: A sound insulator of the invention includes a sound absorption layer and an air-impermeable resonance layer, which are bonded to each other via an adhesive layer. The sound absorption layer has a thickness in a range of 5 to 50 mm, an area-weight of not greater than 2000 g/m2 and a two-layer structure of a high-density sound absorption layer and a low-density sound absorption layer. The high-density sound absorption layer is bonded to the air-impermeable resonance layer via the adhesive layer and has a density in a range of 0.05 to 0.20 g/cm3 and a thickness in a range of 2 to 30 mm. The low-density sound absorption layer is bonded to the other face of the high-density sound absorption layer via an adhesive layer and has a density in a range of 0.01 to 0.10 g/cm3 and a thickness in a range of 2 to 30 mm.
    Type: Grant
    Filed: January 9, 2014
    Date of Patent: July 21, 2015
    Assignees: Takehiro Co., Ltd., Toyota Boshoku Corporation
    Inventors: Toru Inoue, Masaki Ishikawa, Youhei Ishikawa, Sohei Matsuyama, Hideyuki Mori
  • Publication number: 20140124290
    Abstract: A sound insulator of the invention includes a sound absorption layer and an air-impermeable resonance layer, which are bonded to each other via an adhesive layer. The sound absorption layer has a thickness in a range of 5 to 50 mm, an area-weight of not greater than 2000 g/m2 and a two-layer structure of a high-density sound absorption layer and a low-density sound absorption layer. The high-density sound absorption layer is bonded to the air-impermeable resonance layer via the adhesive layer and has a density in a range of 0.05 to 0.20 g/cm3 and a thickness in a range of 2 to 30 mm. The low-density sound absorption layer is bonded to the other face of the high-density sound absorption layer via an adhesive layer and has a density in a range of 0.01 to 0.10 g/cm3 and a thickness in a range of 2 to 30 mm.
    Type: Application
    Filed: January 9, 2014
    Publication date: May 8, 2014
    Applicants: Toyota Boshoku Corporation, Takehiro Co., Ltd.
    Inventors: Toru Inoue, Masaki Ishikawa, Youhei Ishikawa, Sohei Matsuyama, Hideyuki Mori
  • Patent number: 8637145
    Abstract: A sound insulator of the invention includes a sound absorption layer and an air-impermeable resonance layer, which are bonded to each other via an adhesive layer. The sound absorption layer has a thickness in a range of 5 to 50 mm, an area-weight of not greater than 2000 g/m2 and a two-layer structure of a high-density sound absorption layer and a low-density sound absorption layer The high-density sound absorption layer is bonded to the air-impermeable resonance layer via the adhesive layer and has a density in a range of 0.05 to 0.20 g/cm3and a thickness in a range of 2 to 30 mm. The low-density sound absorption layer is bonded to the other face of the high-density sound absorption layer via an adhesive layer and has a density in a range of 0.01 to 0.10 g/cm3 and a thickness in a range of 2 to 30 mm.
    Type: Grant
    Filed: April 10, 2012
    Date of Patent: January 28, 2014
    Assignees: Takehiro Co., Ltd., Toyota Boshoku Corporation
    Inventors: Toru Inoue, Masaki Ishikawa, Youhei Ishikawa, Sohei Matsuyama, Hideyuki Mori
  • Patent number: 8532893
    Abstract: In an automatic transmission with a speed changer having a plurality of engagement elements and configured to shift the speed changer into a selected one of a plurality of shift stages by switching engaged and disengaged states of the engagement elements, a first rotation sensor is provided for detecting input rotation of the speed changer and a second rotation sensor for detecting output rotation of the speed changer. Also provided is a transmission controller configured to determine whether a change in input torque inputted into the speed changer occurs. The transmission controller is further configured to determine that interlock has occurred in the speed changer, when there is no pulse signal output from the second rotation sensor though, during a vehicle stopped state, the input-torque change has occurred and the pulse signal from the first rotation sensor has been outputted.
    Type: Grant
    Filed: June 6, 2011
    Date of Patent: September 10, 2013
    Assignee: Jatco Ltd
    Inventors: Yutaka Tohyama, Hideharu Yamamoto, Masahiro Hamano, Hiroyasu Tanaka, Youhei Ishikawa
  • Publication number: 20120255809
    Abstract: A sound insulator of the invention includes a sound absorption layer and an air-impermeable resonance layer, which are bonded to each other via an adhesive layer. The sound absorption layer has a thickness in a range of 5 to 50 mm, an area-weight of not greater than 2000 g/m2 and a two-layer structure of a high-density sound absorption layer and a low-density sound absorption layer. The high-density sound absorption layer is bonded to the air-impermeable resonance layer via the adhesive layer and has a density in a range of 0.05 to 0.20 g/cm3 and a thickness in a range of 2 to 30 mm. The low-density sound absorption layer is bonded to the other face of the high-density sound absorption layer via an adhesive layer and has a density in a range of 0.01 to 0.10 g/cm3 and a thickness in a range of 2 to 30 mm.
    Type: Application
    Filed: April 10, 2012
    Publication date: October 11, 2012
    Inventors: Toru Inoue, Masaki Ishikawa, Youhei Ishikawa, Sohei Matsuyama, Hideyuki Mori
  • Publication number: 20120143448
    Abstract: In an automatic transmission with a speed changer having a plurality of engagement elements and configured to shift the speed changer into a selected one of a plurality of shift stages by switching engaged and disengaged states of the engagement elements, a first rotation sensor is provided for detecting input rotation of the speed changer and a second rotation sensor for detecting output rotation of the speed changer. Also provided is a transmission controller configured to determine whether a change in input torque inputted into the speed changer occurs. The transmission controller is further configured to determine that interlock has occurred in the speed changer, when there is no pulse signal output from the second rotation sensor though, during a vehicle stopped state, the input-torque change has occurred and the pulse signal from the first rotation sensor has been outputted.
    Type: Application
    Filed: June 6, 2011
    Publication date: June 7, 2012
    Inventors: Yutaka TOHYAMA, Hideharu Yamamoto, Masahiro Hamano, Hiroyasu Tanaka, Youhei Ishikawa
  • Patent number: 8194879
    Abstract: The objective of the present invention is to efficiently and inexpensively mass-produce a sound insulator for a vehicle which is light in weight and has excellent sound insulating properties. For this purpose, the ultra-light sound insulator of the present invention is composed of a felt single sheet 3 having a vehicle interior side surface 1 and a vehicle exterior side surface 2 and being thermoformed of cotton fibers and binder fibers which are tangled and contacted and jointed to each other in a random manner. The ratio of the stiffness of the vehicle interior side surface 1 to that of the vehicle exterior side surface 2 is set to be in a range of 1.1 to 10. The single sheet 3 also has an area of gradually-decreasing stiffness 4 that spreads over at least one part of the area between the vehicle interior side surface 1 and the vehicle exterior side surface 2.
    Type: Grant
    Filed: December 13, 2006
    Date of Patent: June 5, 2012
    Assignees: Takehiro Co., Ltd., Toyota Boshoku Kabushiki Kaisha
    Inventors: Masaki Ishikawa, Youhei Ishikawa, Sohei Matsuyama, Hideyuki Mori
  • Patent number: 8158246
    Abstract: A sound insulator of the invention includes a sound absorption layer 202 and an air-impermeable resonance layer 203, which are bonded to each other via an adhesive layer 204. The sound absorption layer 202 has a thickness in a range of 5 to 50 mm and an area-weight of not greater than 2000 g/m2. The sound absorption layer 202 has a two-layer structure of a high-density sound absorption layer 202a and a low-density sound absorption layer 202b, which have different densities. The high-density sound absorption layer 202a is bonded to the air-impermeable resonance layer 203 via the adhesive layer 204 and has a density in a range of 0.05 to 0.20 g/cm3 and a thickness in a range of 2 to 30 mm. The low-density sound absorption layer 202b is bonded to the other face of the high-density sound absorption layer 202a, which is opposite to the air-impermeable resonance layer 203, via an adhesive layer 202c and has a density in a range of 0.01 to 0.10 g/cm3 and a thickness in a range of 2 to 30 mm.
    Type: Grant
    Filed: March 23, 2004
    Date of Patent: April 17, 2012
    Assignees: Takehiro Co., Ltd., Toyota Boshoku Corporation
    Inventors: Toru Inoue, Masaki Ishikawa, Youhei Ishikawa, Sohei Matsuyama, Hideyuki Mori
  • Patent number: 7412907
    Abstract: A range recognition apparatus for an automatic transmission. A first contact is configured to generate a first range signal during a state of a range selector being within a first region. A second contact is configured to generate a second range signal during the state of the range selector being within a second region overlapping with the first region. A controller is configured to recognize that a first gear range of the automatic transmission is selected, when the first range signal is present and the second range signal is absent; to recognize that a second gear range of the automatic transmission is selected, when the first range signal is absent and the second range signal is present; and to recognize that the first gear range is selected, when the first range signal and the second range signal are both present.
    Type: Grant
    Filed: October 5, 2005
    Date of Patent: August 19, 2008
    Assignee: Jatco Ltd
    Inventors: Takeshi Oohori, Youhei Ishikawa, Takuichiro Inoue, Hiroyasu Tanaka
  • Patent number: 7331900
    Abstract: The shift control apparatus for a continuously-variable transmission includes a primary pulley; a secondary pulley connected with the primary pulley by a belt; a shift actuator that varies a speed ratio; a line pressure adjusting that adjusts a line pressure; a secondary-pressure adjusting section that adjusts a secondary pressure; and a control section that controls the shift actuator, the line pressure adjusting section, and the secondary-pressure adjusting section. Moreover, the control section includes a fail determining section that determines whether the shift actuator is under a failed condition.
    Type: Grant
    Filed: September 21, 2005
    Date of Patent: February 19, 2008
    Assignee: Jatco Ltd
    Inventors: Hideki Oshita, Hiroyasu Tanaka, Takuichiro Inoue, Youhei Ishikawa, Kousuke Abe
  • Publication number: 20070189510
    Abstract: Disclosed is a data collector that collects a first data string sent by a control unit to a network according to a predetermined format. The control unit has a first identification number, and the first data string includes the first identification number and a parameter which is used to control a vehicle or a vehicle component. The data collector includes a first collecting means for collecting the first data string sent by the control unit; and a second collecting means for collecting a second data string sent by a data converter. The data converter has a second identification number different from the first identification number of the control unit and the second data string conforms to the predetermined format. The data converter converts analog data sent from a sensor that detects a driving condition of the vehicle into digital data, puts the second identification number and the digital data in the second data string to be sent, and sends the second data string at a predetermined interval.
    Type: Application
    Filed: August 29, 2005
    Publication date: August 16, 2007
    Inventors: Hiroyasu Tanaka, Takuichiro Inoue, Youhei Ishikawa, Yasuhiro Tani, Toshiji Iida
  • Publication number: 20070144829
    Abstract: The objective of the present invention is to efficiently and inexpensively mass-produce a sound insulator for a vehicle which is light in weight and has excellent sound insulating properties. For this purpose, the ultra-light sound insulator of the present invention is composed of a felt single sheet 3 having a vehicle interior side surface 1 and a vehicle exterior side surface 2 and being thermoformed of cotton fibers and binder fibers which are tangled and contacted and jointed to each other in a random manner. The ratio of the stiffness of the vehicle interior side surface 1 to that of the vehicle exterior side surface 2 is set to be in a range of 1.1 to 10. The single sheet 3 also has an area of gradually-decreasing stiffness 4 that spreads over at least one part of the area between the vehicle interior side surface 1 and the vehicle exterior side surface 2.
    Type: Application
    Filed: December 13, 2006
    Publication date: June 28, 2007
    Applicants: TAKEHIRO CO., LTD., TOYOTA BOSHOKU KABUSHIKI KAISHA
    Inventors: Masaki ISHIKAWA, Youhei ISHIKAWA, Sohei MATSUYAMA, Hideyuki MORI
  • Patent number: 7229372
    Abstract: During a downshift of a belt-drive continuously variable transmission, occurring owing to vehicle deceleration, a CVT controller foretells that a slippage between a drive belt and each of primary and secondary variable-width pulleys tends to occur, when a primary pulley pressure is less than a first predetermined pressure level and a primary pulley speed is less than a first predetermined rotational speed. When the belt slippage has been foretold, the CVT controller inhibits the primary pulley pressure from dropping by setting an actual transmission ratio calculated before a set time period from a time when the slippage has been foretold or a transmission ratio of a relatively higher speed side as compared with a ratio-change operating state obtained when the slippage has been foretold, to a desired transmission ratio, or by relatively rising a line pressure as compared with a line pressure level produced when the slippage has been foretold.
    Type: Grant
    Filed: September 26, 2003
    Date of Patent: June 12, 2007
    Assignee: JATCO Ltd
    Inventors: Shigeki Shimanaka, Hiroyasu Tanaka, Youhei Ishikawa, Tatsuo Wakahara, Yoshihisa Kodama, Hideki Oshita
  • Patent number: 7169070
    Abstract: There are provided with a determination means for determining whether or not the correlation between the pressure value detected by the primary pressure sensor and the pressure value detected by the secondary pressure sensor is an actually impossible relation (Step 5), and a switchover means for switching over to an open control while prohibiting a feedback control when the correlation is determined to have become a relation actually impossible by the determination means (Step 6). Presence or absence of a fault to the primary pressure sensor or the secondary pressure sensor (particularly, fault of fixed output voltage) is judged based on the correlation between the output voltage of the primary pressure sensor and the output voltage of the secondary pressure sensor to prohibit the control of a primary pressure and a secondary pressure using the hydraulic pressure sensors when it is judged that there is a fault.
    Type: Grant
    Filed: September 26, 2003
    Date of Patent: January 30, 2007
    Assignee: Jatco Ltd.
    Inventors: Tateki Jozaki, Shigeru Ishii, Tatsuo Wakahara, Masahiro Yamamoto, Hiroyasu Tanaka, Youhei Ishikawa
  • Publication number: 20060201741
    Abstract: A sound insulator of the invention includes a sound absorption layer 202 and an air-impermeable resonance layer 203, which are bonded to each other via an adhesive layer 204. The sound absorption layer 202 has a thickness in a range of 5 to 50 mm and an area-weight of not greater than 2000 g/m2. The sound absorption layer 202 has a two-layer structure of a high-density sound absorption layer 202a and a low-density sound absorption layer 202b, which have different densities. The high-density sound absorption layer 202a is bonded to the air-impermeable resonance layer 203 via the adhesive layer 204 and has a density in a range of 0.05 to 0.20 g/cm3 and a thickness in a range of 2 to 30 mm. The low-density sound absorption layer 202b is bonded to the other face of the high-density sound absorption layer 202a, which is opposite to the air-impermeable resonance layer 203, via an adhesive layer 202c and has a density in a range of 0.01 to 0.10 g/cm3 and a thickness in a range of 2 to 30 mm.
    Type: Application
    Filed: March 23, 2004
    Publication date: September 14, 2006
    Inventors: Toru Inoue, Masaki Ishikawa, Youhei Ishikawa, Sohei Matsuyama, Hideyuki Mori
  • Publication number: 20060075839
    Abstract: A range recognition apparatus for an automatic transmission. A first contact is configured to generate a first range signal during a state of a range selector being within a first region. A second contact is configured to generate a second range signal during the state of the range selector being within a second region overlapping with the first region. A controller is configured to recognize that a first gear range of the automatic transmission is selected, when the first range signal is present and the second range signal is absent; to recognize that a second gear range of the automatic transmission is selected, when the first range signal is absent and the second range signal is present; and to recognize that the first gear range is selected, when the first range signal and the second range signal are both present.
    Type: Application
    Filed: October 5, 2005
    Publication date: April 13, 2006
    Inventors: Takeshi Oohori, Youhei Ishikawa, Takuichiro Inoue, Hiroyasu Tanaka
  • Publication number: 20060063641
    Abstract: The shift control apparatus for a continuously-variable transmission includes; a primary pulley; a secondary pulley connected with the primary pulley by a belt; a shift actuator adapted to vary a speed ratio; a line pressure adjusting section configured to adjust a line pressure; a secondary-pressure adjusting section configured to adjust a secondary pressure; and a control section configured to control the shift actuator, the line pressure adjusting section, and the secondary-pressure adjusting section. Moreover, the control section includes a fail determining section configured to determine whether the shift actuator is under a failed condition.
    Type: Application
    Filed: September 21, 2005
    Publication date: March 23, 2006
    Inventors: Hideki Oshita, Hiroyasu Tanaka, Takuichiro Inoue, Youhei Ishikawa, Kousuke Abe
  • Publication number: 20050192153
    Abstract: There are provided with a determination means for determining whether or not the correlation between the pressure value detected by the primary pressure sensor and the pressure value detected by the secondary pressure sensor is an actually impossible relation (Step 5), and a switchover means for switching over to an open control while prohibiting a feedback control when the correlation is determined to have become a relation actually impossible by the determination means (Step 6). Presence or absence of a fault to the primary pressure sensor or the secondary pressure sensor (particularly, fault of fixed output voltage) is judged based on the correlation between the output voltage of the primary pressure sensor and the output voltage of the secondary pressure sensor to prohibit the control of a primary pressure and a secondary pressure using the hydraulic pressure sensors when it is judged that there is a fault.
    Type: Application
    Filed: September 26, 2003
    Publication date: September 1, 2005
    Applicant: JATCO Ltd
    Inventors: Tateki Jozaki, Shigeru Ishii, Tatsuo Wakahara, Masahiro Yamamoto, Hiroyasu Tanaka, Youhei Ishikawa