Patents by Inventor Hideki SANAI

Hideki SANAI 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: 10946856
    Abstract: Provided is a vehicle drive system capable of suppressing a feeling of acceleration drop and free running, thereby improving vehicle riding comfort. The vehicle drive system includes: an internal combustion engine for driving a primary drive wheel; a stepped variable transmission; an assist motor for driving a secondary drive wheel; and a motor control device for controlling the assist motor, wherein the stepped variable transmission is a seamless-shift transmission configured such that a drive force to be transmitted therethrough is interrupted during shifting down, but not substantially interrupted during shifting up, and the motor control device is operable, during the shifting down by the stepped variable transmission, to cause the assist motor to generate a drive force to compensate for the interruption of the drive force.
    Type: Grant
    Filed: September 23, 2019
    Date of Patent: March 16, 2021
    Assignee: Mazda Motor Corporation
    Inventors: Hajime Oyama, Shigeo Yoshikawa, Hiroyuki Shirata, Hideki Sanai
  • Publication number: 20210039509
    Abstract: To provide a vehicle drive device capable of efficiently driving a vehicle by using in-wheel motors without falling into the vicious cycle between enhancement of driving via the motors and an increase in vehicle weight. The present invention is a vehicle drive device that uses in-wheel motors to drive a vehicle and includes in-wheel motors (20) that are provided in wheels (2b) of a vehicle (1) and drive wheels, in which the in-wheel motors generate the maximum output power in a high revolutions range equal to or more than a predetermined number of revolutions that is more than zero.
    Type: Application
    Filed: March 19, 2019
    Publication date: February 11, 2021
    Applicant: Mazda Motor Corporation
    Inventors: Isao TODA, Seiyo HIRANO, Kei YONEMORI, Hideki SANAI
  • Publication number: 20210023935
    Abstract: To provide a vehicle drive device capable of efficiently driving a vehicle by using in-wheel motors without falling into the vicious cycle between enhancement of driving via the motors and an increase in vehicle weight. The present invention is a vehicle drive device that uses in-wheel motors to drive a vehicle and includes a vehicle speed sensor that detects the travel speed of a vehicle, in-wheel motors that are provided in wheels of the vehicle and drive the wheels, and a controller that controls the in-wheel motors, in which the controller controls the in-wheel motors so as to generate driving forces when the travel speed of the vehicle detected by the vehicle speed sensor is equal to or more than a predetermined first vehicle speed that is more than zero.
    Type: Application
    Filed: March 19, 2019
    Publication date: January 28, 2021
    Inventors: Isao TODA, Seiyo HIRANO, Kei YONEMORI, Hideki SANAI
  • Publication number: 20210016765
    Abstract: A hybrid driving apparatus is provided which enables a driver to sufficiently enjoy a driving feeling of a vehicle driven by an internal combustion engine. A hybrid driving apparatus includes an internal combustion engine that drive main driving wheels, a motive power transmission mechanism transmitting a driving force to the main driving wheels, a main driving electric motor driving the main driving wheels, an accumulator, sub-driving electric motors transmitting motive power to sub-driving wheels of the vehicle, and a control apparatus executing an electric motor traveling mode and an internal combustion engine traveling mode. The control apparatus causes the internal combustion engine to generate the driving force, the internal combustion engine is a flywheel-less engine, and the control apparatus causes the main driving electric motor to generate a torque for maintaining idling of the internal combustion engine in the internal combustion engine traveling mode.
    Type: Application
    Filed: February 14, 2019
    Publication date: January 21, 2021
    Applicant: Mazda Motor Corporation
    Inventors: Isao TODA, Seiyo HIRANO, Hideki SANAI
  • Publication number: 20210016653
    Abstract: To provide a vehicle drive device capable of effectively driving a vehicle by using in-wheel motors without falling into the vicious cycle between enhancement of driving via the motors and an increase in vehicle weight. The present invention is a vehicle drive device that uses in-wheel motors to drive a vehicle and includes in-wheel motors (20) that are provided in wheels (2b) of a vehicle (1) and drive the wheels, a body side motor (16) that is provided in a body of the vehicle and drives the wheels of the vehicle, and a battery (18) and a capacitor (22) that supply electric power for driving the in-wheel motors and/or the body side motor, in which a voltage of the battery is applied to the body side motor and a voltage of the battery and the capacitor connected in series is applied to the in-wheel motors.
    Type: Application
    Filed: March 19, 2019
    Publication date: January 21, 2021
    Applicant: Mazda Motor Corporation
    Inventors: Isao TODA, Seiyo HIRANO, Kei YONEMORI, Hideki SANAI
  • Publication number: 20210016782
    Abstract: A vehicle drive device uses in-wheel motors to drive a vehicle and includes in-wheel motors that are provided in wheels of a vehicle and drive the wheels, a body side motor that is provided in a body of the vehicle and drives the wheels, and a controller that controls the in-wheel motors and the body side motor based on requested output power of a driver, in which the controller causes the body side motor to generate a driving force and the in-wheel motors not to generate driving forces when the requested output power of the driver is less than predetermined output power and the controller causes the body side motor and the in-wheel motors to generate driving forces when the requested output power of the driver is equal to or more than the predetermined output power.
    Type: Application
    Filed: March 19, 2019
    Publication date: January 21, 2021
    Applicant: Mazda Motor Corporation
    Inventors: Isao TODA, Seiyo HIRANO, Kei YONEMORI, Hideki SANAI
  • Publication number: 20210008971
    Abstract: A hybrid driving apparatus includes an internal combustion engine, a motive power transmission mechanism transmitting a driving force to main driving wheels, a main driving electric motor generating a driving force of the main driving wheels, an accumulator, subdriving electric motors generating driving forces of sub-driving wheels, and a control apparatus executing an electric motor traveling mode and an internal combustion engine traveling mode. The sub-driving electric motor is provided to each of the sub-driving wheels, the control apparatus causes only the main driving electric motor to generate the driving force in the electric motor traveling mode and causes the main driving electric motor and the sub-driving electric motors to generate the driving forces in acceleration of the vehicle at a predetermined vehicle speed or higher, and although the engine generates the driving force, it does not cause the motors to generate driving forces in the traveling mode.
    Type: Application
    Filed: March 15, 2019
    Publication date: January 14, 2021
    Applicant: Mazda Motor Corporation
    Inventors: Isao TODA, Seiyo HIRANO, Hideki SANAI
  • Publication number: 20200376967
    Abstract: A vehicle drive system includes: a power supply in which a battery and a capacitor are connected in series; a primary drive motor to which a voltage of the battery is provided; secondary drive motors to each of which a total voltage (Vin) of the battery and the power supply capacitor is provided; a charging circuit; and a control circuit that controls charging/discharging of the power supply. The control circuit operates switches SW1, SW2 of the charging circuit so as to control charging/discharging of the battery and the capacitor.
    Type: Application
    Filed: May 26, 2020
    Publication date: December 3, 2020
    Applicant: Mazda Motor Corporation
    Inventors: Akihiro FURUKAWA, Seiyo HIRANO, Hideki SANAI
  • Publication number: 20200376949
    Abstract: A vehicle drive system includes: a primary drive motor and a secondary drive motor; a battery; a capacitor that is connected in-series with the battery; a first power line that supplies a total aggregate voltage of the battery and the capacitor; a second power line that supplies a battery voltage; and a third power line that supplies a cell voltage. The first power line, the second power line, and the third power line are configured such that the battery voltage is higher than the cell voltage and that the total voltage is higher than the battery voltage.
    Type: Application
    Filed: May 26, 2020
    Publication date: December 3, 2020
    Applicant: Mazda Motor Corporation
    Inventors: Akihiro FURUKAWA, Seiyo HIRANO, Hideki SANAI
  • Publication number: 20200247340
    Abstract: A vehicle power supply system configured to be installed in a vehicle. The vehicle power supply system includes a battery having a rated voltage lower than a first voltage; a capacitor having a rated voltage higher than the first voltage; circuitry configured to discharge electric charge stored in the capacitor; and a controller configured to control the circuitry to charge the battery by discharging the electric charge stored in the capacitor in response to detection of a collision of the vehicle or detection of a process to replace the capacitor.
    Type: Application
    Filed: January 29, 2020
    Publication date: August 6, 2020
    Applicant: Mazda Motor Corporation
    Inventors: Akihiro FURUKAWA, Seiyo HIRANO, Hideki SANAI
  • Publication number: 20200247253
    Abstract: A vehicle power supply system configured to be charged by an electric vehicle (EV) charging station that performs charging with a voltage equal to or more than a predetermined lower limit voltage. The vehicle power supply system includes a battery having a rated voltage lower than the lower limit voltage; a capacitor electrically connected in series to the battery, wherein a sum of the rated voltage of the battery and a rated voltage of the capacitor is greater than the first voltage; and an interface configured to receive electric power from the EV charging station. The vehicle power supply system also includes circuitry configured to receive electric power from the EV charging station, and charge the battery and the capacitor using the received electric power.
    Type: Application
    Filed: January 27, 2020
    Publication date: August 6, 2020
    Applicant: Mazda Motor Corporation
    Inventors: Akihiro FURUKAWA, Seiyo HIRANO, Hideki SANAI
  • Publication number: 20200114901
    Abstract: Provided is a vehicle drive system capable of suppressing a feeling of acceleration drop and free running, thereby improving vehicle riding comfort. The vehicle drive system includes: an internal combustion engine for driving a primary drive wheel; a stepped variable transmission; an assist motor for driving a secondary drive wheel; and a motor control device for controlling the assist motor, wherein the stepped variable transmission is a seamless-shift transmission configured such that a drive force to be transmitted therethrough is interrupted during shifting down, but not substantially interrupted during shifting up, and the motor control device is operable, during the shifting down by the stepped variable transmission, to cause the assist motor to generate a drive force to compensate for the interruption of the drive force.
    Type: Application
    Filed: September 23, 2019
    Publication date: April 16, 2020
    Inventors: Hajime Oyama, Shigeo Yoshikawa, Hiroyuki Shirata, Hideki Sanai
  • Patent number: 8498767
    Abstract: A power-supply control apparatus of a vehicle comprises a first electricity-storage device to supply electric power to a starter for starting engine, a generator to convert kinetic energy of the vehicle during a vehicle deceleration to electric energy for energy recovery, a second electricity-storage device coupled to the generator to store the electric power from the generator thereat, a feeder circuit coupling the second electricity-storage device to an electric load with a relatively-small electric-load capacity via a DC/DC convertor, a coupling line coupling the second electricity-storage device to the first electricity-storage device via a coupling relay, and a controller to control the electric power passing through the feeder circuit and the coupling line, wherein the controller executes a control to make the coupling relay on the coupling line in an OFF state when the starter operates.
    Type: Grant
    Filed: May 17, 2012
    Date of Patent: July 30, 2013
    Assignee: Mazda Motor Corporation
    Inventors: Kazuya Kotani, Hideki Sanai, Takeharu Yamashita, Masayoshi Takahashi
  • Patent number: 8433502
    Abstract: One example method for an engine having an automatic stopping function in which the engine is automatically stopped when a predetermined engine stopping condition is satisfied, and then the engine is automatically restarted when a predetermined engine restarting condition is satisfied, includes the following: a first step for driving a motor so as to increase an engine rotating speed of the engine up to a predetermined rotating speed and maintain the engine rotating speed, in a case in which a predetermined first condition is satisfied when the engine rotating speed is below the predetermined rotating speed during automatic engine stopping; and a second step for restarting a fuel supply into the engine in a case in which a predetermined second condition is satisfied after the first step is executed.
    Type: Grant
    Filed: July 14, 2010
    Date of Patent: April 30, 2013
    Assignee: Mazda Motor Corporation
    Inventors: Kunitomo Minamitani, Katsumasa Yoshida, Seiyo Hirano, Akitomo Kume, Hideki Sanai, Kazuya Kotani
  • Publication number: 20120296506
    Abstract: A power-supply control apparatus of a vehicle comprises a first electricity-storage device to supply electric power to a starter for starting engine, a generator to convert kinetic energy of the vehicle during a vehicle deceleration to electric energy for energy recovery, a second electricity-storage device coupled to the generator to store the electric power from the generator thereat, a feeder circuit coupling the second electricity-storage device to an electric load with a relatively-small electric-load capacity via a DC/DC convertor, a coupling line coupling the second electricity-storage device to the first electricity-storage device via a coupling relay, and a controller to control the electric power passing through the feeder circuit and the coupling line, wherein the controller executes a control to make the coupling relay on the coupling line in an OFF state when the starter operates.
    Type: Application
    Filed: May 17, 2012
    Publication date: November 22, 2012
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Kazuya KOTANI, Hideki SANAI, Takeharu YAMASHITA, Masayoshi TAKAHASHI
  • Publication number: 20110029221
    Abstract: One example method for an engine having an automatic stopping function in which the engine is automatically stopped when a predetermined engine stopping condition is satisfied, and then the engine is automatically restarted when a predetermined engine restarting condition is satisfied, includes the following: a first step for driving a motor so as to increase an engine rotating speed of the engine up to a predetermined rotating speed and maintain the engine rotating speed, in a case in which a predetermined first condition is satisfied when the engine rotating speed is below the predetermined rotating speed during automatic engine stopping; and a second step for restarting a fuel supply into the engine in a case in which a predetermined second condition is satisfied after the first step is executed.
    Type: Application
    Filed: July 14, 2010
    Publication date: February 3, 2011
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Kunitomo MINAMITANI, Katsumasa YOSHIDA, Seiyo HIRANO, Akitomo KUME, Hideki SANAI, Kazuya KOTANI