Patents by Inventor Ryohey Toyota

Ryohey Toyota 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: 20200400228
    Abstract: A power transmission device includes a variator, a first oil passage, an electric oil pump provided in the first oil passage, a second oil passage, a switching valve provided at a branch point of the first oil passage and the second oil passage, and a third oil passage. The switching valve switches between two positions, i.e. a first position that causes at least the first oil passage to be in a communicating state, and a second position that causes the second oil passage and the first oil passage on a SEC pulley oil chamber side to be in a state of communicating with each other and causes the third oil passage and the first oil passage on a PRI pulley oil chamber side to be in a state of communicating with each other.
    Type: Application
    Filed: December 20, 2018
    Publication date: December 24, 2020
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Kouichi KOTSUJI, Tomoyuki NAKANO, Ryohey TOYOTA
  • Publication number: 20200370640
    Abstract: A control method for a power transmission device includes: performing a switching of a switching valve at a time when an idling stop condition is not satisfied or when a first idling stop condition is satisfied, the time corresponding to a time when a predetermined condition is satisfied; and performing a hydraulic pressure increase of increasing a PRI pressure or an SEC pressure compared to before the predetermined condition is satisfied when switching the switching valve.
    Type: Application
    Filed: December 20, 2018
    Publication date: November 26, 2020
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Tomoyuki NAKANO, Ryohey TOYOTA, Kouichi KOTSUJI
  • Publication number: 20200347933
    Abstract: A control method for a power transmission device includes: determining whether a difference between an actual speed ratio of a variator and a speed ratio at which a movable pulley contacts a stopper is equal to or less than a predetermined value; and performing a switching of a switching valve when being determined that the difference is equal to or less than the predetermined value.
    Type: Application
    Filed: December 20, 2018
    Publication date: November 5, 2020
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Tomoyuki NAKANO, Ryohey TOYOTA, Kouichi KOTSUJI
  • Publication number: 20200347931
    Abstract: A method controls a power transmission device including a continuously variable transmission, an electric oil pump provided in a first oil passage connecting primary and secondary pulley oil chambers of the continuously variable transmission, and a switching valve provided at a branch point between the first oil passage and a second oil passage that branches from the first oil passage between the electric oil pump and the primary pulley oil chamber and that is connected to an oil reservoir. A third oil passage branches from the first oil passage between the electric oil pump and the secondary pulley oil chamber. The method makes a magnitude of a hydraulic pressure difference between the third oil passage and the first oil passage one the side of the primary pulley oil chamber smaller than a prescribed threshold value when the switching valve switches between a first position and a second position.
    Type: Application
    Filed: December 28, 2017
    Publication date: November 5, 2020
    Inventor: Ryohey TOYOTA
  • Publication number: 20200300358
    Abstract: The control mode is switched between a first control mode configured to control the speed change pump based on an actual speed ratio being an actual speed ratio of the variator, and a second control mode configured to control the speed change pump based on an actual working pressure being an actual working pressure of the variator. In the first control mode, the actual speed ratio is calculated based on a detected value of a vehicle speed; and the speed change pump is controlled to cause the actual speed ratio to approach the target speed ratio. In the second control mode, the actual working pressure is detected and the speed change pump is controlled to cause the actual working pressure to approach a target working pressure corresponding to the target speed ratio. In a situation or a condition where the detection accuracy of the vehicle speed by the vehicle speed sensor decreases, the control mode is switched from the first control mode to the second control mode.
    Type: Application
    Filed: November 9, 2018
    Publication date: September 24, 2020
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Ryohey TOYOTA, Tomoyuki NAKANO, Yutaka KANEKO, Kazuhiko TAZOE, Kouichi KOTSUJI
  • Patent number: 10760682
    Abstract: A drive system is provided with a first motor generator as a power source, and a multistage gear transmission for changing the speed of output from the first motor generator and transmitting the output to drive wheels. The multistage gear transmission has a plurality of engagement clutches as shifting elements that are meshingly engaged upon movement from a disengaged position. This hybrid vehicle is provided with a start control device where, when a start clutch has been engaged while the vehicle is stopped, the start control device maintains the engagement of the start clutch for a duration that includes when the vehicle is stopped and until the next vehicle start.
    Type: Grant
    Filed: April 14, 2015
    Date of Patent: September 1, 2020
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Atsushi Tsukizaki, Masato Koga, Hiroyuki Fukuda, Ryohey Toyota
  • Patent number: 10711884
    Abstract: A control method of a continuously variable transmission includes supplying oil pressure to a secondary pulley oil chamber by a source pressure oil pump, and controlling a flow of oil into and from a primary pulley oil chamber by an electric oil pump arranged in an oil passage between the primary pulley oil chamber and the secondary pulley oil chamber. After start-up of the source pressure oil pump, an operation of the electric oil pump is restricted until the oil is filled in the oil passage on the secondary pulley oil chamber side of the electric oil pump. The operation of the electric oil pump is permitted when rotation speed of the electric oil pump reaches a predetermined rotation speed.
    Type: Grant
    Filed: August 7, 2017
    Date of Patent: July 14, 2020
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Ryohey Toyota, Tomoyuki Nakano, Hiromu Terai, Akira Takano, Kouhei Toyohara
  • Patent number: 10626987
    Abstract: A continuously variable transmission control method for controlling entry and exit of oil in a primary pulley oil chamber by an electric oil pump disposed in an oil path between the primary pulley oil chamber and a secondary pulley oil chamber, the control method including: comparing a temperature of the electric oil pump with a first threshold; and restricting a shift amount of a continuously variable transmission when the temperature of the electric oil pump is higher than the first threshold.
    Type: Grant
    Filed: October 4, 2016
    Date of Patent: April 21, 2020
    Assignee: NISSAN MOTOR CO., LTD.
    Inventors: Tomoyuki Nakano, Hiromu Terai, Ryohey Toyota
  • Patent number: 10584789
    Abstract: A control method of a continuously variable transmission includes supplying oil pressure to a line-pressure oil passage and a secondary pulley oil chamber by a source pressure oil pump, controlling a flow of oil into and from a primary pulley oil chamber by an electric oil pump arranged in an oil passage between the primary pulley oil chamber and the secondary pulley oil chamber, and limiting a discharge flowrate of the electric oil pump to an amount smaller than a discharge flowrate of the source pressure oil pump.
    Type: Grant
    Filed: August 7, 2017
    Date of Patent: March 10, 2020
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Ryohey Toyota, Tomoyuki Nakano, Hiromu Terai, Akira Takano, Kouhei Toyohara
  • Publication number: 20190338852
    Abstract: A continuously variable transmission control method for controlling entry and exit of oil in a primary pulley oil chamber by an electric oil pump disposed in an oil path between the primary pulley oil chamber and a secondary pulley oil chamber, the control method including: comparing a temperature of the electric oil pump with a first threshold; and restricting a shift amount of a continuously variable transmission when the temperature of the electric oil pump is higher than the first threshold.
    Type: Application
    Filed: October 4, 2016
    Publication date: November 7, 2019
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Tomoyuki NAKANO, Hiromu TERAI, Ryohey TOYOTA
  • Patent number: 10458546
    Abstract: A continuously variable transmission includes a variator having a primary pulley that has a primary oil chamber, a secondary pulley that has a secondary oil chamber, and a belt looped over the primary pulley and the secondary pulley, wherein secondary pressure is supplied to the secondary oil chamber, an oil pump provided in an oil passage that provides communication between the primary oil chamber and the secondary oil chamber, and a controller. The oil pump is configured to control an inflow and an outflow of oil of the primary oil chamber. The oil pump is formed by a gear pump. The continuously variable transmission controls the oil pump in such a manner that a target speed ratio of the variator is achieved.
    Type: Grant
    Filed: August 7, 2017
    Date of Patent: October 29, 2019
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Kouhei Toyohara, Tomoyuki Nakano, Hiromu Terai, Ryohey Toyota
  • Patent number: 10458545
    Abstract: A continuously variable transmission has a primary pulley hydraulic chamber, a secondary pulley hydraulic chamber, a first oil passage connected to the secondary pulley hydraulic chamber, a second oil passage connected to the primary pulley hydraulic chamber, the second oil passage branching from the first oil passage, an electric oil pump provided on the second oil passage so as to allow oil to flow into and flow out from the primary pulley hydraulic chamber, and an oil discharge mechanism configured to discharge oil outside the second oil passage, the oil being to be supplied to the primary pulley hydraulic chamber by the electric oil pump.
    Type: Grant
    Filed: August 4, 2016
    Date of Patent: October 29, 2019
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Ryohey Toyota, Hiromu Terai, Tomoyuki Nakano
  • Publication number: 20190257413
    Abstract: A control method of a continuously variable transmission includes supplying oil pressure to a secondary pulley oil chamber by a source pressure oil pump, and controlling a flow of oil into and from a primary pulley oil chamber by an electric oil pump arranged in an oil passage between the primary pulley oil chamber and the secondary pulley oil chamber. After start-up of the source pressure oil pump, an operation of the electric oil pump is restricted until the oil is filled in the oil passage on the secondary pulley oil chamber side of the electric oil pump. The operation of the electric oil pump is permitted when rotation speed of the electric oil pump reaches a predetermined rotation speed.
    Type: Application
    Filed: August 7, 2017
    Publication date: August 22, 2019
    Applicant: Nissan Motor Co., Ltd.
    Inventors: Ryohey Toyota, Tomoyuki Nakano, Hiromu Terai, Akira Takano, Kouhei Toyohara
  • Patent number: 10358136
    Abstract: In a hybrid vehicle, rotational speed control on a motor/generator connected to a first engagement clutch is carried out when there is a gear shift request to a gear shift stage at which the first engagement clutch of the multistage gear transmission is meshingly engaged. A transmission control unit is provided for outputting a meshing engagement instruction to the first engagement clutch when a rotational speed feedback control causes a differential rotation speed of the first engagement clutch to be within a range of a synchronization determination rotational speed. Upon executing the rotational speed feedback control on the motor/generator, this transmission control unit reduces the efficacy of the rotational speed feedback control less than before starting of the meshingly engagement, when the meshing engagement of the first engagement clutch is started.
    Type: Grant
    Filed: April 8, 2016
    Date of Patent: July 23, 2019
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Ryohey Toyota, Masato Koga
  • Publication number: 20190203833
    Abstract: A continuously variable transmission has a primary pulley hydraulic chamber, a secondary pulley hydraulic chamber, a first oil passage connected to the secondary pulley hydraulic chamber, a second oil passage connected to the primary pulley hydraulic chamber, the second oil passage branching from the first oil passage, an electric oil pump provided on the second oil passage so as to allow oil to flow into and flow out from the primary pulley hydraulic chamber, and an oil discharge mechanism configured to discharge oil outside the second oil passage, the oil being to be supplied to the primary pulley hydraulic chamber by the electric oil pump.
    Type: Application
    Filed: August 4, 2016
    Publication date: July 4, 2019
    Applicant: Nissan Motor Co., Ltd.
    Inventors: Ryohey Toyota, Hiromu Terai, Tomoyuki Nakano
  • Publication number: 20190203834
    Abstract: A continuously variable transmission includes a variator having a primary pulley that has a primary oil chamber, a secondary pulley that has a secondary oil chamber, and a belt looped over the primary pulley and the secondary pulley, wherein secondary pressure is supplied to the secondary oil chamber, an oil pump provided in an oil passage that provides communication between the primary oil chamber and the secondary oil chamber, and a controller. The oil pump is configured to control an inflow and an outflow of oil of the primary oil chamber. The oil pump is formed by a gear pump. The continuously variable transmission controls the oil pump in such a manner that a target speed ratio of the variator is achieved.
    Type: Application
    Filed: August 7, 2017
    Publication date: July 4, 2019
    Applicant: Nissan Motor Co., Ltd.
    Inventors: Kouhei Toyohara, Tomoyuki Nakano, Hiromu Terai, Ryohey Toyota
  • Publication number: 20190195343
    Abstract: A control method of a continuously variable transmission includes supplying oil pressure to a line-pressure oil passage and a secondary pulley oil chamber by a source pressure oil pump, controlling a flow of oil into and from a primary pulley oil chamber by an electric oil pump arranged in an oil passage between the primary pulley oil chamber and the secondary pulley oil chamber, and limiting a discharge flowrate of the electric oil pump to an amount smaller than a discharge flowrate of the source pressure oil pump.
    Type: Application
    Filed: August 7, 2017
    Publication date: June 27, 2019
    Applicant: Nissan Motor Co., Ltd.
    Inventors: Ryohey Toyota, Tomoyuki Nakano, Hiromu Terai, Akira Takano, Kouhei Toyohara
  • Patent number: 10295052
    Abstract: A vehicle transmission control device is provided in a vehicle having a gear type transmission capable of selecting a plurality of gear shift patterns, and an electric oil pump for supplying lubricating oil to a gear-shifting mechanism. The vehicle transmission control device includes a transmission controller that selects a path having a small load on the lubricated parts from among the plurality of power transmission paths upon detecting a malfunction has occurred in the oil pump to prevent seizing of lubricated parts and damage to gear-shifting mechanism if a malfunction occurs in the oil pump.
    Type: Grant
    Filed: June 22, 2015
    Date of Patent: May 21, 2019
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Atsushi Tsukizaki, Masato Koga, Hiroyuki Fukuda, Ryohey Toyota, Hidekazu Yagi
  • Patent number: 10279673
    Abstract: A mode transition control device is provided for a hybrid vehicle. The mode transition control device reduces a sensation of discomfort that may be imparted to a driver at a time of a mode transition from a series traveling mode to a parallel traveling mode during traveling. During mode transition from the series traveling mode to the parallel traveling mode in a hybrid vehicle, a gear shift stage is selected such that a rotational speed change amount of an internal combustion engine accompanying mode transition is less than or equal to a predetermined threshold value.
    Type: Grant
    Filed: June 3, 2015
    Date of Patent: May 7, 2019
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Atsushi Tsukizaki, Ryohey Toyota
  • Patent number: 10232698
    Abstract: A mode transition control device a hybrid vehicle has a transmission control unit that prevents a second power generation system from overheating while traveling in a series HEV mode. When a battery is at a power generation request threshold value or lower, the vehicle travels in a “series HEV mode,” in which the first electric motor is utilized as a drive source and receives electrical power from the second motor/generator and the battery. The transmission control unit controls the traveling mode to transition from the “series HEV mode” to a “parallel HEV mode” when the vehicle speed has reached a switchover vehicle speed. When a temperature rise of the second power generation system is predicted while traveling in the “series HEV mode,” the transmission control unit changes the switchover vehicle speed to a slower switchover vehicle speed that was used prior to a determination of the temperature rise.
    Type: Grant
    Filed: June 9, 2015
    Date of Patent: March 19, 2019
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Tomohiro Miyagawa, Masato Koga, Atsushi Tsukizaki, Ryohey Toyota