Patents by Inventor Hajime Tasaka

Hajime Tasaka 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: 10677349
    Abstract: Pressure regulation valve control device has line pressure regulation valve (4) having line pressure solenoid (41) and line pressure spool valve (42) and CVT control unit (8) controlling secondary pressure (Psec) by actuating the line pressure spool valve (42) by solenoid pressure (Psol) produced by controlling current command value (I) to the line pressure solenoid (41). CVT control unit (8) has abnormality control unit (81). The abnormality control unit (81) is configured to, when decrease in secondary pressure (Psec) is detected during travel, execute, during travel, abnormality control that increases solenoid pressure (Psol), supplied to line pressure spool valve (42) from line pressure solenoid (41), more than solenoid pressure (Psol) of a time when the decrease in secondary pressure (Psec) is detected. With this, even when the decrease in the pressure is detected during travel, the decrease in the pressure is suppressed during travel while reducing influence on vehicle travel.
    Type: Grant
    Filed: July 19, 2017
    Date of Patent: June 9, 2020
    Assignee: JATCO LTD
    Inventors: Soyoung Lee, Hajime Tasaka, Kokan Boku, Kosuke Abe, Tomoyuki Suwabe
  • Patent number: 10591053
    Abstract: A failure judgment device of an automatic transmission includes: a first abnormality judging section configured to judge a power supply fault abnormality or a breaking abnormality of the solenoid, from a selected shift stage and a state of the transmission mechanism, after the detection of the electric abnormality; and a second abnormality judging section configured to judge the power supply abnormality or the breaking abnormality of the solenoid, from the monitor current value when the solenoid valve is switched to an OFF state, after the detection of the electric abnormality, when one of the first abnormality judging section and the second abnormality judging section judges the power supply fault abnormality or the breaking abnormality, the judgement result being outputted.
    Type: Grant
    Filed: February 17, 2016
    Date of Patent: March 17, 2020
    Assignees: JATCO LTD, NISSAN MOTOR CO., LTD.
    Inventors: Hajime Tasaka, Youji Itou, Masahiro Hamano, Naonori Iizuka, Norihira Amano, Heo Chang Moo
  • Publication number: 20200025289
    Abstract: Pressure regulation valve control device has line pressure regulation valve (4) having line pressure solenoid (41) and line pressure spool valve (42) and CVT control unit (8) controlling secondary pressure (Psec) by actuating the line pressure spool valve (42) by solenoid pressure (Psol) produced by controlling current command value (I) to the line pressure solenoid (41). CVT control unit (8) has abnormality control unit (81). The abnormality control unit (81) is configured to, when decrease in secondary pressure (Psec) is detected during travel, execute, during travel, abnormality control that increases solenoid pressure (Psol), supplied to line pressure spool valve (42) from line pressure solenoid (41), more than solenoid pressure (Psol) of a time when the decrease in secondary pressure (Psec) is detected. With this, even when the decrease in the pressure is detected during travel, the decrease in the pressure is suppressed during travel while reducing influence on vehicle travel.
    Type: Application
    Filed: July 19, 2017
    Publication date: January 23, 2020
    Applicant: JATCO Ltd
    Inventors: Soyoung LEE, Hajime TASAKA, Kokan BOKU, Kosuke ABE, Tomoyuki SUWABE
  • Patent number: 10160460
    Abstract: The integrated controller determines whether or not, regardless of execution of the WSC control, a rotation speed of the motor generator falls to less than an idle rotation speed and also whether or not differential rotation of the second clutch becomes less than a predetermined value, and determines that, if the determination is positive, a continuous MAX pressure failure has occurred in the second clutch.
    Type: Grant
    Filed: March 20, 2014
    Date of Patent: December 25, 2018
    Assignees: JATCO LTD, NISSAN MOTOR CO., LTD.
    Inventors: Norihira Amano, Hajime Tasaka
  • Publication number: 20180106368
    Abstract: A failure judgment device of an automatic transmission includes: a first abnormality judging section configured to judge a power supply fault abnormality or a breaking abnormality of the solenoid, from a selected shift stage and a state of the transmission mechanism, after the detection of the electric abnormality; and a second abnormality judging section configured to judge the power supply abnormality or the breaking abnormality of the solenoid, from the monitor current value when the solenoid valve is switched to an OFF state, after the detection of the electric abnormality, when one of the first abnormality judging section and the second abnormality judging section judges the power supply fault abnormality or the breaking abnormality, the judgement result being outputted.
    Type: Application
    Filed: February 17, 2016
    Publication date: April 19, 2018
    Applicants: JATCO Ltd, NISSAN MOTOR CO., LTD.
    Inventors: Hajime TASAKA, Youji ITOU, Masahiro HAMANO, Naonori IIZUKA, Norihira AMANO, Heo Chang MOO
  • Patent number: 9576405
    Abstract: A failure determination device of a hybrid vehicle, includes an engine, a motor arranged in series with the engine, a clutch arranged between the motor and a driving wheel, a pressure adjusting mechanism that adjusts hydraulic pressure supplied to the clutch, and that performs wet start clutch control for adjusting the hydraulic pressure, supplied to the clutch at least upon starting, to the hydraulic pressure causing the clutch to slip, and a controller configured to calculate required driving force on the basis of accelerator opening, and calculate torque capacity of the clutch, required for transmitting the required driving force by the clutch, as target torque capacity, calculate actual torque of the engine and actual torque of the motor, and calculate a torque deviation as a deviation between the target torque capacity and a sum of the actual torque of the engine and the actual torque of the motor.
    Type: Grant
    Filed: June 2, 2014
    Date of Patent: February 21, 2017
    Assignees: JATCO Ltd, NISSAN MOTOR CO., LTD.
    Inventors: Norihira Amano, Hajime Tasaka
  • Publication number: 20160280232
    Abstract: The integrated controller determines whether or not, regardless of execution of the WSC control, a rotation speed of the motor generator falls to less than an idle rotation speed and also whether or not differential rotation of the second clutch becomes less than a predetermined value, and determines that, if the determination is positive, a continuous MAX pressure failure has occurred in the second clutch.
    Type: Application
    Filed: March 20, 2014
    Publication date: September 29, 2016
    Applicants: JATCO LTD, NISSAN MOTOR CO., LTD.
    Inventors: Norihira AMANO, Hajime TASAKA
  • Publication number: 20160125670
    Abstract: A failure determination device of a hybrid vehicle, includes an engine, a motor arranged in series with the engine, a clutch arranged between the motor and a driving wheel, a pressure adjusting mechanism that adjusts hydraulic pressure supplied to the clutch, and that performs wet start clutch control for adjusting the hydraulic pressure, supplied to the clutch at least upon starting, to the hydraulic pressure causing the clutch to slip, and a controller configured to calculate required driving force on the basis of accelerator opening, and calculate torque capacity of the clutch, required for transmitting the required driving force by the clutch, as target torque capacity, calculate actual torque of the engine and actual torque of the motor, and calculate a torque deviation as a deviation between the target torque capacity and a sum of the actual torque of the engine and the actual torque of the motor.
    Type: Application
    Filed: June 2, 2014
    Publication date: May 5, 2016
    Applicants: JATCO Ltd, Nissan Motor Co., Ltd.
    Inventors: Norihira Amano, Hajime Tasaka
  • Patent number: 8788165
    Abstract: An abnormal state diagnosis method for an automatic transmission oil temperature sensor includes: a warm-up judging step of judging whether a sensor value from an engine side temperature sensor in an engine warm-up state indicates the engine warm-up state; a sensor normal operation judgment step of starting to judge whether the engine side temperature sensor including the warm-up judgment result normally performs a temperature detection operation; a provisional judgment step of judging whether an upper or lower deviation width between the sensor value of the engine side temperature sensor and an oil temperature sensor value from an automatic transmission oil temperature sensor is equal to or smaller than a predetermined threshold value; and a final judgment step of determining the judgment result by the provisional judgment step when the automatic transmission control unit receives a permission signal from the engine control module.
    Type: Grant
    Filed: November 6, 2012
    Date of Patent: July 22, 2014
    Assignee: JATCO Ltd
    Inventors: Yasuhiko Yuyama, Hajime Tasaka, Masahiro Hamano
  • Patent number: 8636620
    Abstract: An automatic transmission has a transmission control section performing a control so that a transmission ratio defined as input rpm/output rpm of the automatic transmission becomes a target transmission ratio, a slip control section slip-controlling a frictional engagement element in the automatic transmission so that the input rpm becomes a value obtained by multiplying the output rpm by the target transmission ratio also adding a predetermined slip revolution speed; and an abnormality judgment section judging abnormality in the automatic transmission. When the slip-control is not in progress, if an actual transmission ratio is out of a predetermined range of the target transmission ratio, the abnormality judgment section judges that abnormality occurs. When the slip-control is in progress, if a value obtained by correcting the actual transmission ratio on the basis of the slip revolution speed is out of the predetermined range, the abnormality judgment section judges that abnormality occurs.
    Type: Grant
    Filed: October 26, 2011
    Date of Patent: January 28, 2014
    Assignee: JATCO Ltd
    Inventors: Fumitaka Nagashima, Hajime Tasaka, Takateru Kawaguchi, Takeo Aizawa, Kakuzou Kaneko
  • Patent number: 8460157
    Abstract: In torque down control apparatus and method for an automotive vehicle, an upper limit value of a drive force of a prime mover is reduced to a predetermined value when a predetermined condition is established, the upper limit value of the drive force is increased at a predetermined speed to recover the upper limit value of the drive force from the predetermined value, the recovery is limited when an accelerator opening angle is smaller than a predetermined opening angle than a case where the accelerator opening angle is equal to or larger than the predetermined opening angle during the recovery of the upper limit value of the drive force, and the limitation is relieved when a vehicle speed is equal to or higher than a predetermined vehicle speed than a case where the vehicle speed is lower than the predetermined vehicle speed.
    Type: Grant
    Filed: June 6, 2011
    Date of Patent: June 11, 2013
    Assignee: Jatco Ltd
    Inventors: Hajime Tasaka, Yutaka Tohyama, Masahiro Hamano
  • Publication number: 20120108391
    Abstract: An automatic transmission has a transmission control section performing a control so that a transmission ratio defined as input rpm/output rpm of the automatic transmission becomes a target transmission ratio, a slip control section slip-controlling a frictional engagement element in the automatic transmission so that the input rpm becomes a value obtained by multiplying the output rpm by the target transmission ratio also adding a predetermined slip revolution speed; and an abnormality judgment section judging abnormality in the automatic transmission. When the slip-control is not in progress, if an actual transmission ratio is out of a predetermined range of the target transmission ratio, the abnormality judgment section judges that abnormality occurs. When the slip-control is in progress, if a value obtained by correcting the actual transmission ratio on the basis of the slip revolution speed is out of the predetermined range, the abnormality judgment section judges that abnormality occurs.
    Type: Application
    Filed: October 26, 2011
    Publication date: May 3, 2012
    Inventors: Fumitaka Nagashima, Hajime Tasaka, Takateru Kawaguchi, Takeo Aizawa, Kakuzou Kaneko
  • Publication number: 20120021870
    Abstract: In torque down control apparatus and method for an automotive vehicle, an upper limit value of a drive force of a prime mover is reduced to a predetermined value when a predetermined condition is established, the upper limit value of the drive force is increased at a predetermined speed to recover the upper limit value of the drive force from the predetermined value, the recovery is limited when an accelerator opening angle is smaller than a predetermined opening angle than a case where the accelerator opening angle is equal to or larger than the predetermined opening angle during the recovery of the upper limit value of the drive force, and the limitation is relieved when a vehicle speed is equal to or higher than a predetermined vehicle speed than a case where the vehicle speed is lower than the predetermined vehicle speed.
    Type: Application
    Filed: June 6, 2011
    Publication date: January 26, 2012
    Inventors: Hajime Tasaka, Yutaka Tohyama, Masahiro Hamano
  • Patent number: 8095284
    Abstract: An automatic transmission control unit determines whether or not a constantly open failure, in which a switch valve cannot switch a pressure regulating valve and a second hydraulic chamber to a non-communicative state, has occurred on the basis of a parameter (an inertia phase time, for example) representing a dynamic characteristic during a shift from a first gear position to a second gear position. The determination of the constantly open failure is begun after initial variation in the parameter representing the dynamic characteristic during the shift has been eliminated through learning control in which the dynamic characteristic during the shift is caused to approach a target dynamic characteristic.
    Type: Grant
    Filed: June 4, 2009
    Date of Patent: January 10, 2012
    Assignee: JATCO Ltd
    Inventors: Fumitaka Nagashima, Hajime Tasaka, Yoshihide Shinso
  • Patent number: 7857728
    Abstract: A control apparatus for an automatic transmission including a plurality of frictional elements each arranged to be engaged by receiving supply of an engagement pressure regulated by a solenoid, and being arranged to attain a plurality of gear stages by combination of engagements of the frictional elements, the control apparatus includes a failure occurrence sensing section configured to sense an occurrence of a failure-induced disengagement in one of the frictional elements based on a failure of one of the solenoids, based on an engine racing by a depression of an accelerator pedal in a state in which ranges other than a parking range and a neutral range are selected during a stop of a vehicle; and a command output section configured to output a limp home mode command to attain one of the gear stages to enable the vehicle to start.
    Type: Grant
    Filed: September 6, 2007
    Date of Patent: December 28, 2010
    Assignee: JATCO Ltd
    Inventors: Hajime Tasaka, Hirofumi Michioka, Fumitaka Nagashima, Yutaka Tohyama, Jun Kagawa
  • Patent number: 7637844
    Abstract: An automatic transmission control system is provided with a disengagement malfunction determining section and a disengagement malfunction preventing section in an automatic transmission in which the frictional engaging elements are selectively engaged and disengaged to change a rotational speed of a main power source. The disengagement malfunction determining section determines a disengagement malfunction with a first frictional engaging element from among a plurality of frictional engaging elements of the automatic transmission.
    Type: Grant
    Filed: December 26, 2006
    Date of Patent: December 29, 2009
    Assignee: JATCO Ltd
    Inventors: Hajime Tasaka, Fumitaka Nagashima, Hirofumi Michioka
  • Publication number: 20090306867
    Abstract: An automatic transmission control unit determines whether or not a constantly open failure, in which a switch valve cannot switch a pressure regulating valve and a second hydraulic chamber to a non-communicative state, has occurred on the basis of a parameter (an inertia phase time, for example) representing a dynamic characteristic during a shift from a first gear position to a second gear position. The determination of the constantly open failure is begun after initial variation in the parameter representing the dynamic characteristic during the shift has been eliminated through learning control in which the dynamic characteristic during the shift is caused to approach a target dynamic characteristic.
    Type: Application
    Filed: June 4, 2009
    Publication date: December 10, 2009
    Inventors: Fumitaka NAGASHIMA, Hajime Tasaka, Yoshihide Shinso
  • Patent number: 7517302
    Abstract: There is provided a fail control apparatus for an automatic transmission, which, in the event of a friction element failure, is capable of coping with the failure by identifying a failed part without erroneous determination and within a short time. The set gear ratio of a designated gear position at the time of failure and the actual gear ratio are compared with each other to determine whether a friction element has failed, and an alternative gear position which enables a vehicle to start moving again is designated based on the determination result. In determining a failed friction element, one friction element disengaged or engaged due to failure is identified only when the designated gear position is the first speed gear position which is achieved by engaging one low clutch and a one-way clutch. It is therefore possible to determine the details of failure with accuracy and properly set an alternative gear position.
    Type: Grant
    Filed: September 14, 2006
    Date of Patent: April 14, 2009
    Assignee: Jatco Ltd
    Inventors: Hiroyuki Kobayashi, Hirofumi Michioka, Hajime Tasaka
  • Patent number: 7402123
    Abstract: In an automatic transmission control system and method, an electronic control unit is programmed to output a command to establish another gear stage different from the gear stage at the time of occurrence of fault-induced disengagement by combination of engagements of the friction elements other than the friction elements to be engaged at the time of occurrence of fault-induced disengagement, and simultaneously output a plurality of commands to establish a plurality of gear stages corresponding to combination of engagements of the friction elements to be engaged and disengaged, respectively, at the gear stage at the time of occurrence of fault-induced disengagement, when the gear stage at the time of occurrence of the fault-induced disengagement is a predetermined gear stage and the friction element undergoing the fault-induced disengagement is not determined.
    Type: Grant
    Filed: May 31, 2006
    Date of Patent: July 22, 2008
    Assignee: Jatco Ltd
    Inventors: Hiroyuki Kobayashi, Hajime Tasaka, Hirofumi Michioka
  • Publication number: 20080058157
    Abstract: A control apparatus for an automatic transmission including a plurality of frictional elements each arranged to be engaged by receiving supply of an engagement pressure regulated by a solenoid, and being arranged to attain a plurality of gear stages by combination of engagements of the frictional elements, the control apparatus includes a failure occurrence sensing section configured to sense an occurrence of a failure-induced disengagement in one of the frictional elements based on a failure of one of the solenoids, based on an engine racing by a depression of an accelerator pedal in a state in which ranges other than a parking range and a neutral range are selected during a stop of a vehicle; and a command output section configured to output a limp home mode command to attain one of the gear stages to enable the vehicle to start.
    Type: Application
    Filed: September 6, 2007
    Publication date: March 6, 2008
    Inventors: Hajime TASAKA, Hirofumi Michioka, Fumitaka Nagashima, Yutaka Tohyama, Jun Kagawa