Patents by Inventor Seiichiro Takahashi

Seiichiro Takahashi 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: 9441733
    Abstract: A transmission controller determines whether a shift is a kickdown, and when the shift is determined as the kickdown, the target line pressure is increased to a first target pressure corresponding to an input torque to a continuously variable transmission increased by the kickdown; the transmission controller then determines whether the line pressure has reached the first target pressure, and if determined that the line pressure has reached the first target pressure, the target line pressure is increased to a second target pressure higher than the first target pressure.
    Type: Grant
    Filed: May 28, 2013
    Date of Patent: September 13, 2016
    Assignees: JATCO LTD, NISSAN MOTOR CO., LTD.
    Inventors: Seiichiro Takahashi, Takashi Eguchi, Tomohiro Utagawa, Tomoyuki Mizuochi, Hisao Nobu, Kenji Sakakibara, Takahiro Ikeda, Masayuki Shimizu
  • Publication number: 20160223079
    Abstract: Disclosed is a control device for a continuously variable transmission (4) that has, as forward speed change stages, a first speed change stage (32) and a second speed change stage (33).
    Type: Application
    Filed: September 24, 2014
    Publication date: August 4, 2016
    Applicants: JATCO LTD, NISSAN MOTOR CO., LTD
    Inventors: Seiichiro TAKAHASHI, Takuichiro INOUE, Koutarou TAGAMI, Fumito SHINOHARA, Hiroyuki SUZUKI, Yuji OKAMOTO, Takashi NOBUKAWA
  • Publication number: 20160223078
    Abstract: There is provided an oil pressure control device for a belt-type continuously variable transmission which includes two pulleys and a belt, wherein each of the two pulleys has a movable sheave which moves by oil pressure supplied to a hydraulic chamber, wherein the oil pressure control device calculates a request torque according to a running state, wherein when calculating the oil pressure which is supplied to the hydraulic chamber of the movable sheave on the basis of the request torque, the oil pressure control device reduces the request torque if the request torque is greater by a predetermined value or more than an actual input torque which is inputted to the belt-type continuously variable transmission. Accordingly, it is possible to provide an oil pressure control device for a belt-type continuously variable transmission with which undesirable vibration can be avoided by means of stable speed-ratio control.
    Type: Application
    Filed: October 17, 2014
    Publication date: August 4, 2016
    Applicants: JATCO Ltd, NISSAN MOTOR CO., LTD.
    Inventors: Tomoaki HONMA, Seiichiro TAKAHASHI, Akito SUZUKI, Masahiro IRIYAMA
  • Publication number: 20160223077
    Abstract: A control apparatus for a continuously variable transmission (1) that includes a belt-type continuously variable transmission mechanism (40) and friction engagement elements (32), (33) is disclosed. The control apparatus includes: an operation position detection section (65) configured to detect an operation position of a selection lever (50); a selection control section (60b) configured to execute a selection control for engaging the friction engagement elements (32), (33) from a time point at which a switching from a non-travel range to a travel range is detected; a determination section (60) configured to determine engagement states of the friction engagement elements (32, 33); and a pulley pressure control section (60c) configured to control a pulley pressure supplied to two pulleys (41), (42). A belt slippage during an engagement of clutches is suppressed while a load on an oil pump is reduced.
    Type: Application
    Filed: October 17, 2014
    Publication date: August 4, 2016
    Applicants: JATCO Ltd, NISSAN MOTOR CO., LTD.
    Inventors: Seiichiro TAKAHASHI, Daisuke AOKI, Takahiro KOBAYASHI, Juwan KIM, Shinichiro WATANABE, Yuta SUZUKI
  • Publication number: 20160047470
    Abstract: A control device for a belt-type continuously variable transmission CVT includes an engine 1, a belt-type continuously-variable transmitting mechanism 4; a forward/reverse switching mechanism 3 including a forward clutch 31 and a reverse brake 32; and a hydraulic control circuit 71 configured to control a pulley hydraulic pressure and engagement-element pressures for the forward clutch 31 and the reverse brake 32. The control device includes a selection control means for outputting a pulley hydraulic command to obtain an idle-time clamping pressure which is higher than an idle-time minimum pressure (idle-time MIN-pressure) calculated from an input torque, to the hydraulic control circuit 71, when the engine 1 is in operation during a selection of N-range. A position of an element clearance generated in the belt can be maintained even if drag torque is inputted.
    Type: Application
    Filed: November 28, 2013
    Publication date: February 18, 2016
    Applicants: JATCO Ltd, NISSAN MOTOR CO., LTD.
    Inventors: Daisuke AOKI, Takahiro KOBAYASHI, Seiichiro TAKAHASHI, Yuta SUZUKI
  • Patent number: 9212732
    Abstract: A target primary pressure and a target secondary pressure are set based on a speed ratio, a target line pressure as a target value of a line pressure is set to be a value obtained by adding an offset amount, as a positive value, to either one having a higher value out of the target primary pressure and the target secondary pressure, in at least a cross-point region as a region where an absolute value of a deviation, obtained by subtracting the target primary pressure from the target secondary pressure, is smaller than a predetermined deviation, and a primary pressure, a secondary pressure, and the line pressure are controlled to be the target primary pressure, the target secondary pressure, and the target line pressure, respectively.
    Type: Grant
    Filed: February 21, 2013
    Date of Patent: December 15, 2015
    Assignees: JATCO LTD, NISSAN MOTOR CO., LTD.
    Inventors: Seiichiro Takahashi, Takashi Eguchi, Tomohiro Utagawa, Tomoyuki Mizuochi, Hisao Nobu, Kenji Sakakibara, Takahiro Ikeda, Masayuki Shimizu, Masami Sakai
  • Patent number: 9157525
    Abstract: The automatic transmission includes a first friction engagement element which is engaged when a first gear position is realized and disengaged when a second gear position is realized, a second friction engagement element which is engaged when the second gear position is realized and disengaged when the first gear position is realized, and a controller. The controller causes the second friction engagement element to slip by decreasing an instructional pressure for the second friction engagement element while running in the second gear position, and learns an engagement start pressure of the first friction engagement element based on a change in a differential rotation of the second friction engagement element, or in a parameter that changes in accordance with the differential rotation, at a time when an instructional pressure for the first friction engagement element is increased during the slip.
    Type: Grant
    Filed: February 21, 2013
    Date of Patent: October 13, 2015
    Assignees: JATCO LTD, NISSAN MOTOR CO., LTD.
    Inventors: Takuichiro Inoue, Hiroyasu Tanaka, Mamiko Inoue, Seiichiro Takahashi
  • Patent number: 9133930
    Abstract: A transmission controller determines whether a shift returning to low, changing a speed ratio of a continuously variable transmission to the lowest when a vehicle decelerates, is being performed or not, calculates a primary pressure measured lower limit value at which a belt begins to slip actually, based on a deceleration of the vehicle and the speed ratio of the continuously variable transmission, and sets a lower limit value of a target value of the primary pressure during the shift returning to low as the primary pressure measured lower limit value.
    Type: Grant
    Filed: February 21, 2013
    Date of Patent: September 15, 2015
    Assignees: JATCO LTD, NISSAN MOTOR CO., LTD.
    Inventors: Seiichiro Takahashi, Takashi Eguchi, Tomohiro Utagawa, Yuta Ishinabe, Tetsuya Izumi, Takahiro Kobayashi
  • Publication number: 20150243999
    Abstract: A tantalum-containing tin oxide for a fuel cell electrode material, comprising tin oxide containing tantalum. The tantalum content is 0.001-30 mol %. When the tantalum-containing tin oxide is measured by x-ray diffraction, the value for [ITa205/ISnO2]DOPE is smaller than the value for [ITa205/ISnO2]MIX. In addition to the tin oxide particles containing tantalum, ideally a tantalum oxide is present on the surface of the particles. Also, ideally the tantalum oxide is crystalline.
    Type: Application
    Filed: March 6, 2014
    Publication date: August 27, 2015
    Inventors: Seiichiro Takahashi, Naohiko Abe, Hiromu Watanabe, Susumu Takahashi, Koji Taniguchi, Akiko Sugimoto
  • Patent number: 9086144
    Abstract: A transmission controller detects a rotation speed of an input shaft, calculates an inertia torque input to a continuously variable transmission based on a change ratio of the detected rotation speed, obtains a positive inertia torque by extracting a positive portion from the calculated inertia torque, and corrects pulley pressures based on the extracted positive inertia torque.
    Type: Grant
    Filed: February 21, 2013
    Date of Patent: July 21, 2015
    Assignees: JATCO LTD, NISSAN MOTOR CO., LTD.
    Inventors: Seiichiro Takahashi, Takashi Eguchi, Takahiro Kobayashi
  • Publication number: 20150148156
    Abstract: A transmission controller searches a mechanical High, which is a minimum value of a possible speed ratio of the continuously variable transmission (CVT), based on an actual speed ratio, sets a control High lower than the mechanical High by a predetermined amount, and controls a speed ratio of the CVT by setting a minimum value of a speed ratio range of the CVT at the control High.
    Type: Application
    Filed: May 28, 2013
    Publication date: May 28, 2015
    Applicants: JATCO LTD, NISSAN MOTOR CO., LTD.
    Inventors: Yoshio Yasui, Tomoyuki Mizuochi, Seiichiro Takahashi, Takashi Eguchi, Yohei Shimokawa
  • Publication number: 20150148157
    Abstract: A transmission controller determines whether a shift is a kickdown, and when the shift is determined as the kickdown, the target line pressure is increased to a first target pressure corresponding to an input torque to a continuously variable transmission increased by the kickdown; the transmission controller then determines whether the line pressure has reached the first target pressure, and if determined that the line pressure has reached the first target pressure, the target line pressure is increased to a second target pressure higher than the first target pressure.
    Type: Application
    Filed: May 28, 2013
    Publication date: May 28, 2015
    Applicants: JATCO LTD, NISSAN MOTOR CO., LTD.
    Inventors: Seiichiro Takahashi, Takashi Eguchi, Tomohiro Utagawa, Tomoyuki Mizuochi, Hisao Nobu, Kenji Sakakibara, Takahiro Ikeda, Masayuki Shimizu
  • Patent number: 9022900
    Abstract: A control device continuously variable transmission for vehicle according to the present invention includes a continuously variable transmission mechanism capable of continuously changing a speed ratio, a sub-transmission mechanism provided in series with the continuously variable transmission mechanism, including a first gear position and a second gear position having a smaller speed ratio than the first gear position as forward gear positions and adapted to switch between the first gear position and the second gear position by selectively engaging or releasing a plurality of frictional engagement elements, and a transmission control unit wherein a vehicle is stopped with the gear position of the sub-transmission mechanism kept in the second gear position when being stopped in a state where the gear position of the sub-transmission mechanism is in the second gear position.
    Type: Grant
    Filed: February 21, 2011
    Date of Patent: May 5, 2015
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Tomoyuki Suzuki, Yoshihiko Ota, Seiichiro Takahashi
  • Publication number: 20150105988
    Abstract: The automatic transmission includes a first friction engagement element which is engaged when a first gear position is realized and disengaged when a second gear position is realized, a second friction engagement element which is engaged when the second gear position is realized and disengaged when the first gear position is realized, and a controller. The controller causes the second friction engagement element to slip by decreasing an instructional pressure for the second friction engagement element while running in the second gear position, and learns an engagement start pressure of the first friction engagement element based on a change in a differential rotation of the second friction engagement element, or in a parameter that changes in accordance with the differential rotation, at a time when an instructional pressure for the first friction engagement element is increased during the slip.
    Type: Application
    Filed: February 21, 2013
    Publication date: April 16, 2015
    Applicants: JATCO LTD, NISSAN MOTOR CO., LTD.
    Inventors: Takuichiro Inoue, Hiroyasu Tanaka, Mamiko Inoue, Seiichiro Takahashi
  • Publication number: 20150081181
    Abstract: A transmission controller determines whether a shift returning to low, changing a speed ratio of a continuously variable transmission to the lowest when a vehicle decelerates, is being performed or not, calculates a primary pressure measured lower limit value at which a belt begins to slip actually, based on a deceleration of the vehicle and the speed ratio of the continuously variable transmission, and sets a lower limit value of a target value of the primary pressure during the shift returning to low as the primary pressure measured lower limit value.
    Type: Application
    Filed: February 21, 2014
    Publication date: March 19, 2015
    Inventors: Seiichiro Takahashi, Takashi Eguchi, Tomohiro Utagawa, Yuta Ishinabe, Tetsuya Izumi, Takahiro Kobayashi
  • Publication number: 20150080156
    Abstract: A target primary pressure and a target secondary pressure are set based on a speed ratio, a target line pressure as a target value of a line pressure is set to be a value obtained by adding an offset amount, as a positive value, to either one having a higher value out of the target primary pressure and the target secondary pressure, in at least a cross-point region as a region where an absolute value of a deviation, obtained by subtracting the target primary pressure from the target secondary pressure, is smaller than a predetermined deviation, and a primary pressure, a secondary pressure, and the line pressure are controlled to be the target primary pressure, the target secondary pressure, and the target line pressure, respectively.
    Type: Application
    Filed: February 21, 2013
    Publication date: March 19, 2015
    Applicants: JATCO LTD., NISSAN MOTOR CO., LTD.
    Inventors: Seiichiro Takahashi, Takashi Eguchi, Tomohiro Utagawa, Tomoyuki Mizuochi, Hisao Nobu, Kenji Sakakibara, Takahiro Ikeda, Masayuki Shimizu, Masami Sakai
  • Publication number: 20150075360
    Abstract: In a hydraulic control circuit including a solenoid valve, whose change responsiveness in an actual pressure with respect to a change in an instructional pressure deteriorates when the instructional pressure enters a dead band region on a lower pressure side than a dead band threshold, for adjusting a hydraulic pressure supplied to a hydraulic device operated by the hydraulic pressure based on the instructional pressure, the instructional pressure is increased in a stepwise manner to a charge pressure higher than the dead band threshold, when the instructional pressure is set in the dead band region and the instructional pressure increases within the dead band region to such an extent that a speed ratio does not change. Then, a lower limit of the instructional pressure is set to the dead band threshold, and use of the dead band region is prohibited for a certain period of time.
    Type: Application
    Filed: February 21, 2013
    Publication date: March 19, 2015
    Inventors: Seiichiro Takahashi, Takashi Eguchi, Tomohiro Utagawa, Hisao Nobu, Kenji Sakakibara, Takahiro Ikeda, Masayuki Shimizu
  • Publication number: 20150051032
    Abstract: A transmission controller detects a rotation, speed of an input shaft, calculates an inertia torque input to a continuously variable transmission based on a change ratio of the detected rotation speed, obtains a positive inertia torque by extracting a positive portion from the calculated inertia torque, and corrects pulley pressures based on the extracted positive inertia torque.
    Type: Application
    Filed: February 21, 2013
    Publication date: February 19, 2015
    Applicants: JATCO LTD, NISSAN MOTOR CO., LTD.
    Inventors: Seiichiro Takahashi, Takashi Eguchi, Takahiro Kobayashi
  • Patent number: 8911326
    Abstract: A transmission controller operates an electrical oil pump in a steady mode, in which an operating load of the electrical oil pump is set at a steady load, during an idle stop, but operates the electrical oil pump in a high-pressure mode, in which the operating load of the electrical oil pump is higher than the steady load, for a predetermined period when an engine stops rotating.
    Type: Grant
    Filed: January 26, 2011
    Date of Patent: December 16, 2014
    Assignees: Jatco Ltd, Nissan Motor Co., Ltd.
    Inventors: Kousuke Waku, Hideshi Wakayama, Masayuki Miyazono, Keichi Tatewaki, Seiichiro Takahashi, Yuzuru Tohta, Takashi Matsuda, Daisuke Matsumoto
  • Patent number: 8892323
    Abstract: A control device controls a transmission mechanism which includes a first clutch to be engaged at startup and a second clutch, and is interlocked when hydraulic pressure is supplied to the first and second clutches and when the first and second clutches are completely engaged. The control device includes a hydraulic pressure control unit controlling hydraulic pressure supplied to the transmission mechanism so that the first clutch is set in a completely engaged state and the second clutch is set in a slip interlock state where the second clutch is not completely engaged in the case of a return from an idle stop control in which an engine is automatically stopped. The hydraulic pressure control unit starts reducing hydraulic pressure supplied to the second clutch when an increased amount of an engine rotation speed per unit time becomes smaller than a predetermined value.
    Type: Grant
    Filed: January 17, 2011
    Date of Patent: November 18, 2014
    Assignees: Jatco Ltd, Nissan Motor Co., Ltd.
    Inventors: Hideshi Wakayama, Keichi Tatewaki, Hiroshi Sekiya, Koutarou Tagami, Seiichiro Takahashi, Yuzuru Tohta, Takashi Matsuda, Daisuke Matsumoto