Patents by Inventor Sadamu Fujiwara

Sadamu Fujiwara 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: 10393257
    Abstract: A control apparatus includes a select lever, an inhibitor switch, a manual valve, a first SOL, a second SOL, and a controller. The controller controls the first SOL and the second SOL such that a hydraulic pressure is supplied to a first friction element and a second friction element when the inhibitor switch detects a D range. The controller determines that an operation position is at an intermediate position when operations of the first friction element and the second friction element are not detected. The controller determines that the first SOL has a failure when the operation of the first friction element is not detected.
    Type: Grant
    Filed: January 12, 2016
    Date of Patent: August 27, 2019
    Assignees: JATCO LTD, NISSAN MOTOR CO., LTD.
    Inventors: Sadamu Fujiwara, Hideharu Yamamoto
  • Publication number: 20180023699
    Abstract: A control apparatus includes a select lever, an inhibitor switch, a manual valve, a first SOL, a second SOL, and a controller. The controller controls the first SOL and the second SOL such that a hydraulic pressure is supplied to a first friction element and a second friction element when the inhibitor switch detects a D range. The controller determines that an operation position is at an intermediate position when operations of the first friction element and the second friction element are not detected. The controller determines that the first SOL has a failure when the operation of the first friction element is not detected.
    Type: Application
    Filed: January 12, 2016
    Publication date: January 25, 2018
    Applicants: JATCO Ltd, NISSAN MOTOR CO., LTD.
    Inventors: Sadamu FUJIWARA, Hideharu YAMAMOTO
  • Patent number: 8216110
    Abstract: A shifting control system has two gear shift stage groups, two clutches, a clutch release detection section, a pre-shift controller, a clutch oil level detection section and a pre-shift inhibiting section. The clutches are alternately engaged to selectively transmit power from an engine to a wheel. The clutch release detection section detects a release-side clutch which corresponds to the clutch that is in a released state. The pre-shift controller operates a meshing mechanism of the gear shift stage group corresponding to the release-side clutch, so as to undergo pre-shifting when the other clutch is engaged as an engage-side clutch. The clutch oil level detection section determines whether an oil level in the release-side clutch is equal to or greater than a preset oil level. The pre-shift inhibiting section inhibits pre-shifting while the oil level in the release-side clutch is equal to or greater than a preset oil level.
    Type: Grant
    Filed: November 18, 2008
    Date of Patent: July 10, 2012
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Shusaku Katakura, Sadamu Fujiwara
  • Patent number: 7962267
    Abstract: A control apparatus for an automatic transmission includes a target-value setting section configured to set a target rotational-speed difference between input and output rotational speeds of at least one of first and second friction-engagement elements; a total torque-capacity calculating section configured to calculate a total torque capacity of the first and second friction-engagement elements by adding a transmission input torque to a correction value calculated from a deviation between the target rotational-speed difference and an actual rotational-speed difference; a distribution-ratio setting section configured to set a distribution ratio; an individual torque-capacity calculating section configured to calculate individual torque capacities of both second friction-engagement elements on the basis of the total torque capacity and the distribution ratio; and an engagement control section configured to control engagement states of the both friction-engagement elements in accordance with the individual torq
    Type: Grant
    Filed: July 25, 2007
    Date of Patent: June 14, 2011
    Assignee: Jatco Ltd
    Inventors: Tomoaki Honma, Masaaki Uchida, Shusaku Katakura, Yoshinobu Kawamoto, Sadamu Fujiwara
  • Patent number: 7912614
    Abstract: An automatic transmission control apparatus is provided with a control scheme that focuses on the rotational speed differences of the frictional engaging elements and the distribution of torque transferred by the frictional engaging elements. When the automatic transmission is upshifted while in a power-off state, the individual torque capacity of a frictional engaging element being released and the individual torque capacity of a frictional engaging element being connected are corrected by adding a prescribed torque capacity amount to each of the individual torque capacities during an inertia phase of the shift control in which a compensation is executed for inertia related to changing the gear ratio. In this way, frictional losses are induced in the frictional engaging elements so as to absorb the inertia torque and lower the input rotational speed more quickly.
    Type: Grant
    Filed: October 10, 2007
    Date of Patent: March 22, 2011
    Assignee: Jatco Ltd
    Inventors: Tomoaki Honma, Masaaki Uchida, Shusaku Katakura, Yoshinobu Kawamoto, Sadamu Fujiwara
  • Patent number: 7840329
    Abstract: An automatic transmission includes at least an input section, an output section, first and second frictional engagement elements, and a controller. The input section receives an input torque from a drive unit. The first frictional engagement element has an engaged state allowing the output section to rotate at a first transmission gear ratio with respect to the input section. The second frictional engagement element has an engaged state allowing the output section to rotate at a second transmission gear ratio with respect to the input section. The controller controls at least a gear shift from the first transmission gear ratio to the second transmission gear ratio. The controller controls the first and second frictional engagement elements and the drive unit so as to cancel an inertia torque resulting from the gear shift.
    Type: Grant
    Filed: July 12, 2007
    Date of Patent: November 23, 2010
    Assignee: Jatco Ltd
    Inventors: Shusaku Katakura, Masaaki Uchida, Yoshinobu Kawamoto, Tomoaki Honma, Sadamu Fujiwara
  • Patent number: 7771316
    Abstract: A control apparatus of an automatic transmission having first and second frictional engagement elements that achieve lower and higher speed gear stages respectively, includes a target value determination section setting a rotation speed difference between input and output sides of the frictional engagement element, a total torque capacity calculation section calculating a total torque capacity, a distribution ratio determination section setting a distribution ratio of the total torque capacity to the first and second frictional engagement elements, an individual torque capacity calculation section calculating individual torque capacities respectively required of the first and second frictional engagement elements, and an engagement control section controlling engagement conditions of the first and second frictional engagement elements in accordance with the individual torque capacity.
    Type: Grant
    Filed: July 3, 2007
    Date of Patent: August 10, 2010
    Assignee: JATCO Ltd
    Inventors: Tomoaki Honma, Masaaki Uchida, Shusaku Katakura, Yoshinobu Kawamoto, Sadamu Fujiwara
  • Patent number: 7666113
    Abstract: A control apparatus of an automatic transmission having first and second frictional engagement elements that achieve higher and lower speed gear stages respectively, includes a target value determination section setting a rotation speed difference between input and output sides of the frictional engagement element, a total torque capacity calculation section calculating a total torque capacity, a distribution ratio determination section setting a distribution ratio of the total torque capacity to the first and second frictional engagement elements, an individual torque capacity calculation section calculating individual torque capacities respectively required of the first and second frictional engagement elements, and an engagement control section controlling engagement conditions of the first and second frictional engagement elements in accordance with the individual torque capacity.
    Type: Grant
    Filed: July 3, 2007
    Date of Patent: February 23, 2010
    Assignee: Jatco Ltd
    Inventors: Tomoaki Honma, Masaaki Uchida, Shusaku Katakura, Yoshinobu Kawamoto, Sadamu Fujiwara
  • Publication number: 20090145253
    Abstract: A shifting control system has two gear shift stage groups, two clutches, a clutch release detection section, a pre-shift controller, a clutch oil level detection section and a pre-shift inhibiting section. The clutches are alternately engaged to selectively transmit power from an engine to a wheel. The clutch release detection section detects a release-side clutch which corresponds to the clutch that is in a released state. The pre-shift controller operates a meshing mechanism of the gear shift stage group corresponding to the release-side clutch, so as to undergo pre-shifting when the other clutch is engaged as an engage-side clutch. The clutch oil level detection section determines whether an oil level in the release-side clutch is equal to or greater than a preset oil level. The pre-shift inhibiting section inhibits pre-shifting while the oil level in the release-side clutch is equal to or greater than a preset oil level.
    Type: Application
    Filed: November 18, 2008
    Publication date: June 11, 2009
    Applicant: Nissan Motor Co., Ltd.
    Inventors: Shusaku KATAKURA, Sadamu FUJIWARA
  • Publication number: 20080096721
    Abstract: An automatic transmission control apparatus is provided with a control scheme that focuses on the rotational speed differences of the frictional engaging elements and the distribution of torque transferred by the frictional engaging elements. When the automatic transmission is upshifted while in a power-off state, the individual torque capacity of a frictional engaging element being released and the individual torque capacity of a frictional engaging element being connected are corrected by adding a prescribed torque capacity amount to each of the individual torque capacities during an inertia phase of the shift control in which a compensation is executed for inertia related to changing the gear ratio. In this way, frictional losses are induced in the frictional engaging elements so as to absorb the inertia torque and lower the input rotational speed more quickly.
    Type: Application
    Filed: October 10, 2007
    Publication date: April 24, 2008
    Applicant: JATCO LTD
    Inventors: Tomoaki Honma, Masaaki Uchida, Shusaku Katakura, Yoshinobu Kawamoto, Sadamu Fujiwara
  • Publication number: 20080026910
    Abstract: A control apparatus for an automatic transmission includes a target-value setting section configured to set a target rotational-speed difference between input and output rotational speeds of at least one of first and second friction-engagement elements to cause the input rotational speed to be higher than the output rotational speed, when a downshift is carried out during a power-on running; a total torque-capacity calculating section configured to calculate a total torque capacity of the first and second friction-engagement elements by adding a transmission input torque to a correction value calculated from a deviation between the target rotational-speed difference and an actual rotational-speed difference, so as to bring the actual rotational-speed difference to the target rotational-speed difference; a distribution-ratio setting section configured to set a distribution ratio; an individual torque-capacity calculating section configured to calculate individual torque capacities of both second friction-engag
    Type: Application
    Filed: July 25, 2007
    Publication date: January 31, 2008
    Inventors: Tomoaki Honma, Masaaki Uchida, Shusaku Katakura, Yoshinobu Kawamoto, Sadamu Fujiwara
  • Publication number: 20080020897
    Abstract: A control apparatus of an automatic transmission having first and second frictional engagement elements that achieve lower and higher speed gear stages respectively, includes a target value determination section setting a rotation speed difference between input and output sides of the frictional engagement element, a total torque capacity calculation section calculating a total torque capacity, a distribution ratio determination section setting a distribution ratio of the total torque capacity to the first and second frictional engagement elements, an individual torque capacity calculation section calculating individual torque capacities respectively required of the first and second frictional engagement elements, and an engagement control section controlling engagement conditions of the first and second frictional engagement elements in accordance with the individual torque capacity.
    Type: Application
    Filed: July 3, 2007
    Publication date: January 24, 2008
    Inventors: Tomoaki HONMA, Masaaki Uchida, Shusaku Katakura, Yoshinobu Kawamoto, Sadamu Fujiwara
  • Publication number: 20080021622
    Abstract: An automatic transmission includes at least an input section, an output section, first and second frictional engagement elements, and a controller. The input section receives an input torque from a drive unit. The first frictional engagement element has an engaged state allowing the output section to rotate at a first transmission gear ratio with respect to the input section. The second frictional engagement element has an engaged state allowing the output section to rotate at a second transmission gear ratio with respect to the input section. The controller controls at least a gear shift from the first transmission gear ratio to the second transmission gear ratio. The controller controls the first and second frictional engagement elements and the drive unit so as to cancel an inertia torque resulting from the gear shift.
    Type: Application
    Filed: July 12, 2007
    Publication date: January 24, 2008
    Inventors: Shusaku Katakura, Masaaki Uchida, Yoshinobu Kawamoto, Tomoaki Honma, Sadamu Fujiwara
  • Publication number: 20080017467
    Abstract: A control apparatus of an automatic transmission having first and second frictional engagement elements that achieve higher and lower speed gear stages respectively, includes a target value determination section setting a rotation speed difference between input and output sides of the frictional engagement element, a total torque capacity calculation section calculating a total torque capacity, a distribution ratio determination section setting a distribution ratio of the total torque capacity to the first and second frictional engagement elements, an individual torque capacity calculation section calculating individual torque capacities respectively required of the first and second frictional engagement elements, and an engagement control section controlling engagement conditions of the first and second frictional engagement elements in accordance with the individual torque capacity.
    Type: Application
    Filed: July 3, 2007
    Publication date: January 24, 2008
    Inventors: Tomoaki Honma, Masaaki Uchida, Shusaku Katakura, Yoshinobu Kawamoto, Sadamu Fujiwara