Patents Assigned to JATCO
  • Patent number: 10655731
    Abstract: As a mode switching shift line when a sub-transmission mechanism is switched from a first-speed to a second-speed, a first mode switching shift line, which prioritizes a learning of a hydraulic pressure with which a Low brake starts to slip and a learning of a hydraulic pressure with which a High clutch starts to transmit a torque, or a second mode switching shift line, which is a shift line in a Low side with respect to the first mode switching shift line and prioritizes a fuel efficiency of an engine is selected, and the sub-transmission mechanism is switched from the first-speed to the second-speed on the basis of the selected mode switching shift line.
    Type: Grant
    Filed: February 17, 2016
    Date of Patent: May 19, 2020
    Assignees: JATCO LTD, NISSAN MOTOR CO., LTD.
    Inventors: Takashi Koguchi, Sho Okutani, Kenji Hishida, Makoto Komatsu, Takuichiro Inoue, Jongkeun Lim, Hiroyasu Tanaka
  • Publication number: 20200141488
    Abstract: A continuously variable transmission is mounted in a vehicle, and includes a primary pulley, a secondary pulley, and a belt, wherein the belt is wound around the primary pulley and the secondary pulley. A control device performs a low speed position return control by a feedback control employing a control input integral component. The low speed position return control is to control a transmission ratio to a final target transmission ratio for lower speed position while the vehicle is decelerating. The control device performs a limiting control in response to a condition that the transmission ratio has reached the final target transmission ratio during the low speed position return control. The limiting control is to limit the control input integral component based on thrust balance between the primary pulley and the secondary pulley so as to maintain the transmission ratio at the final target transmission ratio.
    Type: Application
    Filed: December 26, 2017
    Publication date: May 7, 2020
    Applicant: JATCO Ltd
    Inventor: Iori OOTA
  • Patent number: 10641386
    Abstract: In an automatic transmission control device of the invention configured to start an increase in engagement pressure of a start-up engagement element, when a determination threshold value for determining that a turbine rotational speed has reduced is reached or exceeded, the determination threshold value when a selection operation from a non-traveling range to a traveling range is made before a prescribed period of time from starting of an engine has elapsed, is increased and set greater than the determination threshold value when the selection operation is made after the prescribed period of time has elapsed. Accordingly, a reduction in the turbine rotational speed can be accurately determined, and thus it is possible to suppress torque fluctuations, occurring owing to engagement of a second brake, which is the start-up engagement element.
    Type: Grant
    Filed: October 21, 2016
    Date of Patent: May 5, 2020
    Assignee: JATCO LTD
    Inventors: Ryosuke Fujii, Hiroaki Shiokawa
  • Publication number: 20200116218
    Abstract: A vehicle control device for a vehicle with a drive source and an automatic transmission including a friction engaging element for transmitting a driving force of the drive source to drive wheels by being engaged by a hydraulic pressure, wherein the vehicle control device is configured to perform an abnormality diagnosis of a solenoid valve for adjusting a hydraulic pressure to be supplied to the friction engaging element on the basis of a slip amount of the friction engaging element, and prohibit the abnormality diagnosis of the solenoid valve if a hydraulic pressure upstream of the solenoid valve is below a predetermined hydraulic pressure at which the friction engaging element is engaged, the hydraulic pressure upstream of the solenoid being a source hydraulic pressure to be adjusted by the solenoid valve.
    Type: Application
    Filed: June 26, 2018
    Publication date: April 16, 2020
    Applicants: JATCO Ltd, NISSAN MOTOR CO., LTD.
    Inventors: Keisuke ICHIKAWA, Tomoaki KABE, Kosuke ABE
  • Publication number: 20200116254
    Abstract: A shifter abnormality diagnosis device for a shifter used in an automatic transmission having a manual mode, the shifter including a first switch for outputting a signal corresponding to the position of a select lever and a second switch for outputting a signal corresponding to the position of the select lever if the select lever is located in at least one of an upshift range or a downshift range, wherein the abnormality diagnosis device is configured to perform an abnormality diagnosis of the second switch on the basis of an output signal of the second switch and prohibit the abnormality diagnosis of the second switch if it is determined that the select lever is not located in any one of forward ranges including the upshift range and the downshift range on the basis of an output signal of the first switch.
    Type: Application
    Filed: June 26, 2018
    Publication date: April 16, 2020
    Applicants: JATCO Ltd, NISSAN MOTOR CO., LTD.
    Inventors: Keisuke ICHIKAWA, Tomoaki KABE, Kosuke ABE
  • Publication number: 20200116255
    Abstract: An automatic transmission control device includes diagnosis means configured to perform an abnormality diagnosis of a rotation sensor on the basis of a maximum cycle and a minimum cycle of a plurality of the pulse signals in a predetermined period.
    Type: Application
    Filed: June 26, 2018
    Publication date: April 16, 2020
    Applicants: JATCO Ltd, NISSAN MOTOR CO., LTD.
    Inventor: Junki MATSUI
  • Patent number: 10619731
    Abstract: A lockup control device for a vehicle includes: a torque converter; a lockup control section configured to increase a lockup pressure difference command to an initial pressure difference when a lockup engagement condition is satisfied in a disengagement state of the lockup clutch, and then to increase the lockup pressure difference command by a ramp pressure difference by a predetermined gradient, the lockup control section being configured to determine a ramp start condition by which the lockup pressure difference command is switched from the initial pressure difference to the ramp pressure difference, based on a speed ratio which is a ratio of input and output rotation speeds of the torque converter.
    Type: Grant
    Filed: January 31, 2017
    Date of Patent: April 14, 2020
    Assignees: JATCO LTD, NISSAN MOTOR CO., LTD.
    Inventors: Takahiro Yamada, Kunihiro Takahashi, Syunsuke Iwamoto, Yuji Okamoto, Toshiaki Noda
  • Patent number: 10612656
    Abstract: A control device of controlling a vehicle that includes an automatic transmission is provided with a control unit. The automatic transmission includes a power transmission mechanism with an engaging element, and a variator connected in series to the power transmission mechanism. The control unit of this device completes engagement of the engaging element after downshifting of the variator is completed when at least an accelerator pedal opening becomes not smaller than a predetermined opening, during neutral running control which brings the power transmission mechanism into a power shut-off state during running of the vehicle.
    Type: Grant
    Filed: January 16, 2017
    Date of Patent: April 7, 2020
    Assignees: JATCO LTD, NISSAN MOTOR CO., LTD.
    Inventors: Yusuke Oota, Yoshimasa Nishihiro
  • Patent number: 10612651
    Abstract: In a vehicle equipped with a torque converter 4 having a lock-up clutch (3), learning control for obtaining a learning value (L_n) on the basis of meet-point information, with which the lock-up clutch (3) initiates torque transmission, is carried out. When the lock-up clutch (3) experiences a transition to an engaged state during travel, a meet-point learning control unit (12c) calculates an LU transmission torque estimate on the basis of the difference between the engine torque (engine torque signal value Te) and the torque converter transmission torque (?·Ne2). Excess clutch capacity is detected when the LU transmission torque estimate is greater than an excess capacity determination transmission torque threshold within a prescribed amount of time after an initial pressure (P_n) based on the learning value (L_n) is instructed. When excess clutch capacity is detected, a learning value correction that reduces the learning value (L_n) is carried out.
    Type: Grant
    Filed: August 31, 2016
    Date of Patent: April 7, 2020
    Assignees: JATCO LTD, NISSAN MOTOR CO., LTD.
    Inventors: Toshimitsu Araki, Hideshi Wakayama, Kouji Saitou, Seiji Kasahara, Tetsuya Izumi
  • Patent number: 10605358
    Abstract: A transmission includes a sub-transmission mechanism, a variator having lower shift responsiveness than the sub-transmission mechanism, and a controller configured to carry out a coordinated shift for changing a speed ratio of the variator in a direction opposite to a changing direction of a speed ratio of the sub-transmission mechanism as the sub-transmission mechanism is shifted so that a through speed ratio reaches a target through speed ratio. The controller sets a target speed ratio of the sub-transmission mechanism on the basis of the target through speed ratio and an actual speed ratio of the variator in carrying out the coordinated shift.
    Type: Grant
    Filed: June 13, 2016
    Date of Patent: March 31, 2020
    Assignees: JATCO LTD, NISSAN MOTOR CO., LTD.
    Inventors: Mamiko Inoue, Hideshi Wakayama
  • Patent number: 10598277
    Abstract: In a vehicle in which a continuously variable transmission, which is connected to an electric motor via a clutch, is operated using oil pressure of an oil pump driven by the motor, erroneous engagement of the clutch is quickly determined. The vehicle has the motor serving as a vehicle driving source, the oil pump connected to the motor, the continuously variable transmission, the clutch interposed between the motor and the continuously variable transmission, a clutch control means for controlling the clutch such that the clutch enters into a completely-engaged, slip-engaged, or release state, and a vehicle control means for controlling the motor such that the motor rotates at a target rotation speed. Also provided is an erroneous engagement handling control means that executes torque adjustment control to decrease an output torque of the vehicle driving source when the clutch is determined to be in an erroneously completely engaged state.
    Type: Grant
    Filed: January 27, 2017
    Date of Patent: March 24, 2020
    Assignees: JATCO LTD, NISSAN MOTOR CO., LTD.
    Inventors: Norihira Amano, Youji Itou, Masahiro Hamano
  • Patent number: 10589731
    Abstract: A sailing stop control method for a vehicle including a transmission and a friction engaging element in series between an engine and drive wheels includes performing a sailing stop control to coast by shutting off power transmission by the friction engaging element, stopping the engine based on satisfaction of a sailing enter condition, restarting the engine upon satisfaction of a sailing exit condition during coasting by the sailing stop control, executing a shift control to set a target speed ratio of the transmission to a highest speed ratio smaller than a coasting speed ratio in normal time and satisfying engine exhaust performance after the restart of the engine if the sailing exit condition is a brake pedal depressing operation, and re-engaging the friction engaging element, if input and output revolution speeds of the friction engaging element are determined to be a synchronous revolution speed after end of the shift control.
    Type: Grant
    Filed: January 17, 2017
    Date of Patent: March 17, 2020
    Assignees: Nissan Motor Co., Ltd., JATCO Ltd
    Inventors: Tadashi Iwamoto, Masayoshi Nakasaki, Yoshimasa Nishihiro, Yukifumi Ootsuka
  • 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
  • Patent number: 10576965
    Abstract: A vehicle is provided with a mechanical oil pump (O/P) that is driven by a motor/generator (MG), an electric oil pump (M/O/P) that is driven by a sub-motor (S/M) and a second clutch (CL2) that transmits the drive force of the motor/generator (MG) to left and right drive wheels (LT, RT). When an accelerator pedal is depressed while a brake pedal is still depressed, an integrated controller (10) drives the electric oil pump (M/O/P) before the brake pedal is released, and oil pressure supplied to the second clutch (CL2) is increased.
    Type: Grant
    Filed: March 9, 2016
    Date of Patent: March 3, 2020
    Assignee: JATCO LTD
    Inventors: Shusaku Katakura, Yutaka Shimizu, Tomoyuki Koike, Yukiyoshi Inuta, Youko Yoshioka
  • Patent number: 10569661
    Abstract: In a specific state where an electric vehicle is in a stop state and a creep torque is generate in an electric motor (2), when a shift range is switched from a traveling range to a non-traveling range, a motor control section (10B) performs a torque decrease control to stepwisely decrease the creep torque of the electric motor (2), and an automatic transmission control device (30) performs a disengagement control to gradually disengage the frictional engagement element of the automatic transmission (3).
    Type: Grant
    Filed: November 15, 2016
    Date of Patent: February 25, 2020
    Assignee: JATCO LTD
    Inventors: Tomoo Mochizuki, Kenichi Ooshima, Hiroshi Miyazaki, Yuji Torizawa, Hiroki Matsui, Daisuke Nakagawa, Takefumi Suzuki
  • Patent number: 10549757
    Abstract: A vehicle control device for controlling a vehicle includes a drive source and an automatic transmission connected to the drive source and including a variator. The vehicle control device includes: a first control unit configured to execute a during-travel drive source stop control for stopping the drive source and shifting the automatic transmission in a neutral state if a during-travel drive source stop condition is satisfied; and a second control unit configured to execute a during-travel drive source stop release control for shifting the automatic transmission in a power transmission state via a rotation synchronization control in the automatic transmission set in the neutral state if a during-travel drive source stop release condition is satisfied.
    Type: Grant
    Filed: October 18, 2016
    Date of Patent: February 4, 2020
    Assignees: JATCO Ltd, NISSAN MOTOR CO., LTD.
    Inventors: Yoshimasa Nishihiro, Masayoshi Nakasaki, Naoki Kobayashi, Yusuke Oota, Shintaro Ohshio
  • Patent number: 10549761
    Abstract: An automatic transmission includes an oil temperature detecting unit configured to detect an oil temperature of the hydraulic oil, and a controller configured to perform the control of the speed ratio on a basis of the oil temperature obtained from the oil temperature detecting unit. The controller is configured such that if the controller has failed to obtain the oil temperature from the oil temperature detecting unit, the controller outputs a command to restrict an output from the driving force source, and such that if the controller has obtained the oil temperature from the oil temperature detecting unit again, the controller gradually cancels the command to restrict the output from the driving force source.
    Type: Grant
    Filed: August 26, 2016
    Date of Patent: February 4, 2020
    Assignees: JATCO LTD, NISSAN MOTOR CO., LTD.
    Inventors: Norihira Amano, Youji Itou, Kosuke Abe
  • Patent number: 10550938
    Abstract: A hydraulic pressure controller includes belt sandwiching force increasing means. The belt sandwiching force increasing means increases a belt sandwiching force by a primary pulley and a secondary pulley on the basis of a braking force request from a driver, up to a predetermined value to prevent a belt from slipping due to a braking force. The belt sandwiching force increasing means increases the belt sandwiching force in a range of less than the predetermined value before the braking force request occurs.
    Type: Grant
    Filed: February 18, 2016
    Date of Patent: February 4, 2020
    Assignees: JATCO LTD, NISSAN MOTOR CO., LTD.
    Inventors: Hiroki Iwasa, Hironori Miyaishi, Tetsuya Izumi
  • Patent number: 10550937
    Abstract: In gear-shift control apparatus and method for a vehicular transmission, a variator which is interposed between an engine and driving wheels and which is capable of modifying a gear (speed) ratio continuously; a sub transmission which is installed in series with the variator and which is capable of switching a plurality of gear-shift stages through a replacement of engagement elements; and a transmission controller which performs a gear ratio control for the variator and a gear-shift stage control for the sub transmission are installed. During a deceleration through a second speed stage of the sub transmission, when the variator is a state in which the variator is at a lowest gear (speed) ratio, a down-shift in which the sub transmission is forced to perform the gear-shift from a second speed stage to a first speed stage, with the variator maintained at the lowest gear (speed) ratio.
    Type: Grant
    Filed: January 10, 2017
    Date of Patent: February 4, 2020
    Assignee: JATCO LTD
    Inventors: Kousuke Waku, Incheol Na, Mamiko Inoue
  • Publication number: 20200032900
    Abstract: For a hybrid vehicle including an engine, a motor generator, and a belt-type continuously variable transmission, a controller performs a low speed position return expediting control in response to a downshift request accompanying deceleration. During the low speed position return expediting control, the controller increases a differential pressure between a primary pressure and a secondary pressure and cause a downshift toward a lowest speed position transmission ratio by reducing the primary pressure, and further reduces the primary pressure when the secondary pressure becomes greater than or equal to a trigger threshold value during the downshift; and terminates the low speed position return expediting control when an actual secondary pressure decreases to a secondary pressure minimum level. The controller further sets a secondary pressure lower limit higher than the secondary pressure minimum level during the low speed position return expediting control.
    Type: Application
    Filed: June 27, 2017
    Publication date: January 30, 2020
    Applicants: JATCO Ltd, NISSAN MOTOR CO., LTD
    Inventors: Hiroyuki TOKOI, Kenji YONEDA, Hironori MIYAISHI