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).

  • 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
  • Patent number: 10232853
    Abstract: A control device for a vehicle includes a fuel cell, a motor-generator, a power unit, a transmission, a motor-generator control unit configured to perform a power control on the motor-generator based on a driver request torque, and a generated power control unit configured to control the generated power of the fuel cell based on a load of the fuel cell including the motor-generator. The motor-generator control unit performs a shifting power control for decreasing a rotation speed of the motor-generator during an upshift of the transmission, and a power control on the motor-generator based on a limit torque of the motor-generator during the shifting power control. The limit torque of the motor-generator being calculated based on an actual generated power of the fuel cell per unit time and an acceptable power of the power unit per unit time.
    Type: Grant
    Filed: September 9, 2014
    Date of Patent: March 19, 2019
    Assignee: NISSAN MOTOR CO., LTD.
    Inventors: Mitsunori Kumada, Ryohey Toyota
  • Patent number: 10183569
    Abstract: A power generation control device is provided for a hybrid vehicle that prevents discomfort to an occupant in a traveling scenario in which stops and starts are repeated. The power generation control device includes a power generation controller that selectively carries out series power generation and idle power generation. In series power generation, a first motor/generator is used as the drive source and electric power is generated in a second motor/generator by an internal combustion engine. In idle power generation, electric power is generated in the second motor/generator by the internal combustion engine while the vehicle is stopped. The power generation controller sets a series power generation start threshold of the battery at which series power generation is started, and an idle power generation start threshold of the battery at which idle power generation is started. The series and idle power generation start thresholds are the same value.
    Type: Grant
    Filed: June 24, 2015
    Date of Patent: January 22, 2019
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Ryohey Toyota, Masato Koga
  • Patent number: 10160348
    Abstract: A starting control device is provided for an electrically driven vehicle having an electric motor and an internal combustion engine as drive sources and a transmission shifts and transmits an output of the electric motor to a drive wheel. The starting control device is configured to suppress an abrupt increase in the rotation of the electric motor at the time of an EV start of the vehicle from a released state of a starting dog clutch. In the electrically driven vehicle, an EV start is carried out by transmitting the output of the first motor/generator (MG1) to the drive wheel via a starting dog clutch that is meshingly engaged. The output of the first motor/generator is limited until the starting dog clutch comes into a meshed state in which the transmission transmits drive power at the time of start from a released state of the starting dog clutch.
    Type: Grant
    Filed: June 1, 2015
    Date of Patent: December 25, 2018
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Atsushi Tsukizaki, Masato Koga, Hiroyuki Fukuda, Ryohey Toyota
  • Patent number: 10093166
    Abstract: A hybrid vehicle has a first motor/generator mechanically coupled to a drive wheel, a second motor/generator mechanically coupled to an internal combustion engine and a high-power battery that is electrically coupled to the motor/generators. The second motor/generator has a smaller electrical power generation capability than the first motor/generator. While starting the vehicle at a time of insufficient battery capacity required for the EV start, the power generation controller disconnects the first electric motor from the drive wheel, connects the first electric motor to the internal combustion engine, and carries out MG1 idle power generation in which the first electric motor generates power by receiving torque from the internal combustion engine. When the vehicle is stopped at a time of sufficient battery capacity, the power generation controller does not carry out the MG1 idle power generation and keeps the first electric motor mechanically coupled to the drive wheel.
    Type: Grant
    Filed: June 8, 2015
    Date of Patent: October 9, 2018
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Ryohey Toyota, Kenichiro Gunji, Tomohiro Miyagawa, Masato Koga, Hiroyuki Fukuda, Hidekazu Yagi, Shinobu Kamada
  • Publication number: 20180201116
    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: Application
    Filed: June 9, 2015
    Publication date: July 19, 2018
    Inventors: Tomohiro MIYAGAWA, Masato KOGA, Atsushi TSUKIZAKI, Ryohey TOYOTA
  • Patent number: 10023182
    Abstract: A transmission control device is provided for a hybrid vehicle that ensures gear shift responsiveness corresponding to a driver's request while achieving excellent gear shifting quality when shifting gears under normal conditions. The transmission control device includes a transmission controller that carries out a shift control for switching between gear shift patterns that are established by the multistage gear transmission by a movement of the engagement clutches based on a gear shift request. The transmission controller selects from among a plurality of gear shift patterns that can be established gear shift patterns in which one engagement clutch is present in a power transmission path leading from the power sources to a drive wheel, and designates the selected gear shift patterns as a normal-use gear shift pattern group, which is used for shift control under normal conditions.
    Type: Grant
    Filed: June 25, 2015
    Date of Patent: July 17, 2018
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Masato Koga, Atsushi Tsukizaki, Ryohey Toyota, Keita Okudaira
  • Publication number: 20180186362
    Abstract: A transmission control device is provided for a hybrid vehicle that ensures gear shift responsiveness corresponding to a driver's request while achieving excellent gear shifting quality when shifting gears under normal conditions. The transmission control device includes a transmission controller that carries out a shift control for switching between gear shift patterns that are established by the multistage gear transmission by a movement of the engagement clutches based on a gear shift request. The transmission controller selects from among a plurality of gear shift patterns that can be established gear shift patterns in which one engagement clutch is present in a power transmission path leading from the power sources to a drive wheel, and designates the selected gear shift patterns as a normal-use gear shift pattern group, which is used for shift control under normal conditions.
    Type: Application
    Filed: June 25, 2015
    Publication date: July 5, 2018
    Inventors: Masato KOGA, Atsushi TSUKIZAKI, Ryohey TOYOTA, Keita OKUDAIRA
  • Publication number: 20180172143
    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: Application
    Filed: June 22, 2015
    Publication date: June 21, 2018
    Inventors: Atsushi TSUKIZAKI, Masato KOGA, Hiroyuki FUKUDA, Ryohey TOYOTA, Hidekazu YAGI
  • Publication number: 20180147931
    Abstract: A power generation control device is provided for a hybrid vehicle that prevents discomfort to an occupant in a traveling scenario in which stops and starts are repeated. The power generation control device includes a power generation controller that selectively carries out series power generation and idle power generation. In series power generation, a first motor/generator is used as the drive source and electric power is generated in a second motor/generator by an internal combustion engine. In idle power generation, electric power is generated in the second motor/generator by the internal combustion engine while the vehicle is stopped. The power generation controller sets a series power generation start threshold of the battery at which series power generation is started, and an idle power generation start threshold of the battery at which idle power generation is started. The series and idle power generation start thresholds are the same value.
    Type: Application
    Filed: June 24, 2015
    Publication date: May 31, 2018
    Inventors: Ryohey TOYOTA, Masato KOGA
  • Publication number: 20180141464
    Abstract: A starting control device is provided for an electrically driven vehicle having an electric motor and an internal combustion engine as drive sources and a transmission shifts and transmits an output of the electric motor to a drive wheel. The starting control device is configured to suppress an abrupt increase in the rotation of the electric motor at the time of an EV start of the vehicle from a released state of a starting dog clutch. In the electrically driven vehicle, an EV start is carried out by transmitting the output of the first motor/generator (MG1) to the drive wheel via a starting dog clutch that is meshingly engaged. The output of the first motor/generator is limited until the starting dog clutch comes into a meshed state in which the transmission transmits drive power at the time of start from a released state of the starting dog clutch.
    Type: Application
    Filed: June 1, 2015
    Publication date: May 24, 2018
    Inventors: Atsushi TSUKIZAKI, Masato KOGA, Hiroyuki FUKUDA, Ryohey TOYOTA
  • Publication number: 20180141428
    Abstract: A hybrid vehicle has a first motor/generator mechanically coupled to a drive wheel, a second motor/generator mechanically coupled to an internal combustion engine and a high-power battery that is electrically coupled to the motor/generators. The second motor/generator has a smaller electrical power generation capability than the first motor/generator. While starting the vehicle at a time of insufficient battery capacity required for the EV start, the power generation controller disconnects the first electric motor from the drive wheel, connects the first electric motor to the internal combustion engine, and carries out MG1 idle power generation in which the first electric motor generates power by receiving torque from the internal combustion engine. When the vehicle is stopped at a time of sufficient battery capacity, the power generation controller does not carry out the MG1 idle power generation and keeps the first electric motor mechanically coupled to the drive wheel.
    Type: Application
    Filed: June 8, 2015
    Publication date: May 24, 2018
    Applicant: Nissan Motor Co., Ltd.
    Inventors: Ryohey TOYOTA, Kenichiro GUNJI, Tomohiro MIYAGAWA, Masato KOGA, Hiroyuki FUKUDA, Hidekazu YAGI, Shinobu KAMADA
  • Publication number: 20180141426
    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: Application
    Filed: June 3, 2015
    Publication date: May 24, 2018
    Inventors: Atsushi TSUKIZAKI, Ryohey TOYOTA
  • Publication number: 20180118216
    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: Application
    Filed: April 8, 2016
    Publication date: May 3, 2018
    Applicant: Nissan Motor Co., Ltd.
    Inventors: Ryohey TOYOTA, Masato KOGA
  • Publication number: 20180106365
    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: Application
    Filed: April 14, 2015
    Publication date: April 19, 2018
    Inventors: Atsushi TSUKIZAKI, Masato KOGA, Hiroyuki FUKUDA, Ryohey TOYOTA
  • Patent number: 9874278
    Abstract: A control device for an automatic transmission disposed in a vehicle driving system, the automatic transmission having an engaging clutch as shift element, has a shift controller that performs a shift control of the automatic transmission. The shift controller is configured such that, during a shift control to release the engaging clutch in response to a first shift request and after determination of a releasing start of the engaging clutch, when a second shift request to engage the engaging cutch is generated, the shift control in response to the first shift request will be continued.
    Type: Grant
    Filed: December 27, 2013
    Date of Patent: January 23, 2018
    Assignee: NISSAN MOTOR CO., LTD.
    Inventors: Ryohey Toyota, Atsushi Tsukizaki, Toshifumi Hibi, Yutaka Kaneko
  • Publication number: 20170274902
    Abstract: A control device for a vehicle includes a fuel cell, a motor-generator, a power unit, a transmission, a motor-generator control unit configured to perform a power control on the motor-generator based on a driver request torque, and a generated power control unit configured to control the generated power of the fuel cell based on a load of the fuel cell including the motor-generator. The motor-generator control unit performs a shifting power control for decreasing a rotation speed of the motor-generator during an upshift of the transmission, and a power control on the motor-generator based on a limit torque of the motor-generator during the shifting power control. The limit torque of the motor-generator being calculated based on an actual generated power of the fuel cell per unit time and an acceptable power of the power unit per unit time.
    Type: Application
    Filed: September 9, 2014
    Publication date: September 28, 2017
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Mitsunori KUMADA, Ryohey TOYOTA
  • Patent number: 9695933
    Abstract: An automatic transmission control device with which it is occurrence of meshing failure at the time of engaging an engagement clutch may be prevented while suppressing prolonged time for completing the engagement. Disclosed is an automatic transmission control device comprising: an automatic transmission that is provided in the drive system of a vehicle and that includes, as an coupling element, an engagement clutch which undergoes meshing/engagement at the time of coupling; and a transmission controller that performs transmission control of the automatic transmission. The engagement clutch includes: a clutch gear connected to a transmission input shaft; and a clutch hub connected to a transmission output shaft and capable of meshing with the clutch gear.
    Type: Grant
    Filed: October 23, 2014
    Date of Patent: July 4, 2017
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Masato Koga, Atsushi Tsukizaki, Kenichi Mori, Ryohey Toyota, Takashi Kurita, Kazuhiro Takaki
  • Patent number: 9662998
    Abstract: A drivetrain from a drive source to drive wheel is provided with a motor-generator for implementing regeneration during deceleration and an automatic transmission having an engaging clutch as a shifting element. The electric vehicle has a gear shifting controller that is programmed to assess whether to grant gear shifting permission based on whether a deceleration grade difference occurring as a result of a reengagement gear shifting is less than a prescribed acceptable deceleration fluctuation when a reengagement gear shift request involving disengaging or engaging the meshing clutch is made during deceleration or regeneration. Shifting is initiated according to the gear-shift request if a decision to grant gear shifting permission is made.
    Type: Grant
    Filed: October 31, 2013
    Date of Patent: May 30, 2017
    Assignee: Nissan Motor Co., Ltd.
    Inventor: Ryohey Toyota