Patents by Inventor Naruyuki Matsui

Naruyuki 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).

  • Patent number: 6976741
    Abstract: In a brake control system for a vehicle, a target wheel cylinder pressure of each wheel is calculated in accordance with a braking force applied by the driver, a brake control mode is determined to be one of an increase pressure mode, a decrease pressure mode, or a maintain pressure mode, and a target increase/decrease force slope is calculated in accordance with a slip amount of the wheel. In particular, the target wheel cylinder pressure is calculated based on actual wheel cylinder pressure and the target increase/decrease pressure slope, set on the target increase/decrease force slope when starting anti-skid control, the target wheel cylinder pressure is calculated after starting the anti-skid control based on the most recent target wheel cylinder pressure and the target increase/decrease pressure slope, and the wheel cylinder pressure Pi is controlled so as to become equal to the target wheel cylinder pressure.
    Type: Grant
    Filed: May 24, 2002
    Date of Patent: December 20, 2005
    Assignees: Toyota Jidosha Kabushiki Kaisha, Denso Corporation
    Inventors: Masahiro Hara, Toshihisa Nihei, Naruyuki Matsui, Masahiro Matsuura
  • Patent number: 6957874
    Abstract: Each of target braking forces for front and rear wheels of a vehicle is calculated based on an amount of braking performed by a driver and a predetermined braking force distribution ratio between the front wheels and the rear wheels. Each of the target regenerative braking forces for the front and rear wheels, respectively, is calculated based on a corresponding one of the target braking forces such that a maximum regeneration efficiency is obtained. If the driver has performed an abrupt braking operation, if the driver has performed a braking operation when the vehicle runs at a high deceleration, or if the vehicle runs at a high lateral speed, it is quite likely that anti-skid control will be started afterwards. Therefore, the target regenerative braking forces are gradually reduced, and target frictional braking forces are gradually increased. If anti-skid control is started, the target regenerative braking forces are set as 0.
    Type: Grant
    Filed: May 29, 2002
    Date of Patent: October 25, 2005
    Assignees: Toyota Jidosha Kabushiki Kaisha, Denso Corporation
    Inventors: Masahiro Hara, Toshihisa Nihei, Naruyuki Matsui, Masahiro Matsuura
  • Patent number: 6880900
    Abstract: A target wheel cylinder pressure for each wheel is calculated according to an amount of braking operation performed by a vehicle operator. When anti-skid control is required, the wheel cylinder pressure is controlled to be equal to the target wheel cylinder pressure for reducing the brake slip of the wheel. When one of the rear-left and the rear-right wheels is anti-skid controlled, the target wheel cylinder pressure for the other wheel for which the anti-skid control is not performed is set to the same value as the target wheel cylinder pressure for the wheel for which the anti-skid control is performed. Linear valves are controlled based on the target wheel cylinder pressure, controlling the wheel cylinder pressures for the rear-left and the rear-right wheels to have substantially the same value.
    Type: Grant
    Filed: May 16, 2002
    Date of Patent: April 19, 2005
    Assignees: Toyota Jidosha Kabushiki Kaisha, Denso Corporation
    Inventors: Masahiro Hara, Toshihisa Nihei, Naruyuki Matsui, Masahiro Matsuura
  • Publication number: 20020180262
    Abstract: In a brake control system for a vehicle, a target wheel cylinder pressure of each wheel is calculated in accordance with a braking force applied by the driver, a brake control mode is determined to be one of an increase pressure mode, a decrease pressure mode, or a maintain pressure mode, and a target increase/decrease force slope is calculated in accordance with a slip amount of the wheel. In particular, the target wheel cylinder pressure is calculated based on actual wheel cylinder pressure and the target increase/decrease pressure slope when starting anti-skid control, the target wheel cylinder pressure is calculated after starting the anti-skid control based on the most recent target wheel cylinder pressure and the target increase/decrease pressure slope, and the wheel cylinder pressure Pi is controlled so as to become equal to the target wheel cylinder pressure.
    Type: Application
    Filed: May 24, 2002
    Publication date: December 5, 2002
    Applicant: Toyota Jidosha Kabushiki Kaisha
    Inventors: Masahiro Hara, Toshihisa Nihei, Naruyuki Matsui, Masahiro Matsuura
  • Publication number: 20020180267
    Abstract: A target wheel cylinder pressure for each wheel is calculated according to an amount of braking operation performed by a vehicle operator. When anti-skid control is required, the wheel cylinder pressure is controlled to be equal to the target wheel cylinder pressure for reducing the brake slip of the wheel. When one of the rear-left and the rear-right wheels is anti-skid controlled, the target wheel cylinder pressure for the other wheel for which the anti-skid control is not performed is set to the same value as the target wheel cylinder pressure for the wheel for which the anti-skid control is performed. Linear valves are controlled based on the target wheel cylinder pressure, controlling the wheel cylinder pressures for the rear-left and the rear-right wheels to have substantially the same value.
    Type: Application
    Filed: May 16, 2002
    Publication date: December 5, 2002
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masahiro Hara, Toshihisa Nihei, Naruyuki Matsui, Masahiro Matsuura
  • Publication number: 20020180266
    Abstract: Each of target braking forces for front and rear wheels of a vehicle is calculated based on an amount of braking performed by a driver and a predetermined braking force distribution ratio between the front wheels and the rear wheels. Each of the target regenerative braking forces for the front and rear wheels, respectively, is calculated based on a corresponding one of the target braking forces such that a maximum regeneration efficiency is obtained. If the driver has performed an abrupt braking operation, if the driver has performed a braking operation when the vehicle runs at a high deceleration, or if the vehicle runs at a high lateral speed, it is quite likely that anti-skid control will be started afterwards. Therefore, the target regenerative braking forces are gradually reduced, and target frictional braking forces are gradually increased. If anti-skid control is started, the target regenerative braking forces are set as 0.
    Type: Application
    Filed: May 29, 2002
    Publication date: December 5, 2002
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masahiro Hara, Toshihisa Nihei, Naruyuki Matsui, Masahiro Matsuura