Patents by Inventor Junki MATSUI

Junki MATSUI 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).

  • Publication number: 20240151305
    Abstract: A vehicle includes a transmission which has a first oil pump driven by rotation of a drive source that drives a drive wheel and a second oil pump provided with a check valve on a suction side and driven by a motor. In a vehicle control device for controlling the vehicle, a minimum value of a drive current value of the motor is defined as a first current value, when the second oil pump is driven in a normal drive state, and a minimum rotation speed of the drive source is increased compared to a case in which the drive current value of the motor is equal to or larger than the first current value, when an automatic downshift control for automatically downshifting a speed ratio of the transmission is executed in a case in which the drive current value of the motor is smaller than the first current value when the second oil pump is driven.
    Type: Application
    Filed: February 25, 2022
    Publication date: May 9, 2024
    Applicants: JATCO Ltd, NISSAN MOTOR CO., LTD.
    Inventors: Tarou MURAZUMI, Hajime TASAKA, Junki MATSUI, Masakatsu OGAWA
  • Patent number: 11397129
    Abstract: An electromagnetic control valve normality determination system includes: a hydraulic pressure source; an electromagnetic control valve structured to regulate an actual pressure of oil to a pressure command point, wherein the oil is supplied from the hydraulic pressure source; and an actual pressure sensor structured to sense the actual pressure of the oil. For determining normality of pressure regulation of the electromagnetic control valve, a normality determinator is configured to: set pressure command regions for determination about pressure regulation of the electromagnetic control valve, without overlapping among the pressure command regions; determine for each of the pressure command regions whether a difference between the actual pressure and the pressure command point in the each of the pressure command regions is less than a threshold value; and determine that the electromagnetic control valve is normal, in response to affirmation of the determination for all of the pressure command regions.
    Type: Grant
    Filed: January 26, 2018
    Date of Patent: July 26, 2022
    Assignees: JATCO LTD, NISSAN MOTOR CO., LTD.
    Inventor: Junki Matsui
  • Patent number: 11054028
    Abstract: A CVT is provided with a primary pulley (1) and a secondary pulley (2) between which a belt (3) is wound, and hydraulic pressure control valves (5, 6, 7) which control pulley hydraulic pressures. A CVT controller (8) sets a base current indicated value to be output to solenoids (5a, 6a, 7a) of the hydraulic pressure control valves (5, 6, 7), on the basis of a pulley hydraulic pressure indicated value. A dither control unit (58) of the CVT controller (8) superimposes a dither current onto the base current indicated value to be output to the solenoids (5a, 6a, 7a) if, during pulley hydraulic pressure control, the situation is determined, on the basis of belt slip determination information, to be such that belt slipping is highly likely to occur.
    Type: Grant
    Filed: November 13, 2018
    Date of Patent: July 6, 2021
    Assignees: JATCO LTD, NISSAN MOTOR CO., LTD.
    Inventor: Junki Matsui
  • Publication number: 20200240516
    Abstract: A CVT is provided with a primary pulley (1) and a secondary pulley (2) between which a belt (3) is wound, and hydraulic pressure control valves (5, 6, 7) which control pulley hydraulic pressures. A CVT controller (8) sets a base current indicated value to be output to solenoids (5a, 6a, 7a) of the hydraulic pressure control valves (5, 6, 7), on the basis of a pulley hydraulic pressure indicated value. A dither control unit (58) of the CVT controller (8) superimposes a dither current onto the base current indicated value to be output to the solenoids (5a, 6a, 7a) if, during pulley hydraulic pressure control, the situation is determined, on the basis of belt slip determination information, to be such that belt slipping is highly likely to occur.
    Type: Application
    Filed: November 13, 2018
    Publication date: July 30, 2020
    Applicants: JATCO Ltd, NISSAN MOTOR CO., LTD.
    Inventor: Junki MATSUI
  • Patent number: 10718390
    Abstract: Abnormality detection device for automatic transmission of invention has automatic transmission 5A connected to vehicle driving source 1, 3 through clutch 4a; range detector detecting selection range of selector lever 9 and outputting detection signal; manual valve 90 configured to, when selector lever is positioned at drive range position, engage clutch and bring automatic transmission into power transmission state, and when selector lever is positioned at range position except drive range position, disengage clutch and bring automatic transmission into power non-transmission state.
    Type: Grant
    Filed: February 16, 2017
    Date of Patent: July 21, 2020
    Assignees: JATCO LTD, NISSAN MOTOR CO., LTD.
    Inventors: Junki Matsui, Masahiro Hamano, Norihira Amano
  • 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
  • Publication number: 20200025266
    Abstract: Abnormality detection device for automatic transmission of invention has automatic transmission 5A connected to vehicle driving source 1, 3 through clutch 4a; range detector detecting selection range of selector lever 9 and outputting detection signal; manual valve 90 configured to, when selector lever is positioned at drive range position, engage clutch and bring automatic transmission into power transmission state, and when selector lever is positioned at range position except drive range position, disengage clutch and bring automatic transmission into power non-transmission state.
    Type: Application
    Filed: February 16, 2017
    Publication date: January 23, 2020
    Applicants: JATCO Ltd, NISSAN MOTOR CO., LTD.
    Inventors: Junki MATSUI, Masahiro HAMANO, Norihira AMANO
  • Publication number: 20200018668
    Abstract: In the present invention, a secondary pressure solenoid valve (74) for adjusting the pressure of oil supplied from an oil pump (70) so as to make the same an indicated pressure and a CVT control unit (8) for determining whether the adjustment operation of the secondary pressure solenoid valve (74) is normal are provided. This device for determining the normality of an electromagnetic control valve is provided with a secondary pressure sensor (82) for detecting the actual pressure arrived at through adjustment by the secondary pressure solenoid valve (74). The CVT control unit (8) uses a plurality of non-overlapping indicated pressure regions as determination regions for determining the normality of the adjustment operation of the secondary pressure solenoid valve (74).
    Type: Application
    Filed: January 26, 2018
    Publication date: January 16, 2020
    Applicants: JATCO Ltd, NISSAN MOTOR CO., LTD.
    Inventor: Junki MATSUI