Patents by Inventor Ryusuke Hirao

Ryusuke Hirao 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: 20120029770
    Abstract: The present invention provides a vehicle body attitude control apparatus capable of improvement of cornering operability, steering stability, and a ride comfort while a vehicle is running. A controller includes a gain, a determination unit, a multiplication unit, an FF control unit, a difference calculation unit, an FB control unit, an average value calculation unit, a target damping force calculation unit, and a damper instruction value calculation unit so as to enable such control that a pitch rate and a roll rate are set into a proportional relationship while the vehicle is cornering. The controller calculates a target pitch rate proportional to the roll rate, variably controls a damping force characteristic of a damping force variable damper disposed at each of front left, front right, rear left, and rear right wheels so as to achieve the target pitch rate, and generates a pitch moment to be applied to the vehicle body accordingly.
    Type: Application
    Filed: July 26, 2011
    Publication date: February 2, 2012
    Inventors: Ryusuke HIRAO, Makoto Yamakado, Nobuyuki Ichimaru
  • Patent number: 8103451
    Abstract: A collision between a vehicle and an obstacle is estimated, and based on the estimation result, vehicle deceleration control is performed by a brake actuator to reduce the collision and vehicle wheel load is controlled by a suspension actuator.
    Type: Grant
    Filed: January 19, 2007
    Date of Patent: January 24, 2012
    Assignee: Hitachi, Ltd.
    Inventors: Taisetsu Tanimichi, Tatsuya Yoshida, Mikio Ueyama, Shinya Ohtsuji, Isa Ismet Khumaedi, Takahide Kobayashi, Koji Fukui, Nobuyuki Ichimaru, Yoichi Kumemura, Shuichiro Kuroiwa, Masaaki Uchiyama, Tatsuya Gankai, Ryusuke Hirao
  • Publication number: 20110127127
    Abstract: Provided is a suspension control apparatus for a vehicle comprising a damping-force adjustable shock absorber interposed between a vehicle body and a wheel of a vehicle, and a controller for variably controlling damping-force characteristics of the damping-force adjustable shock absorber between hard and soft, wherein the controller is configured to switch the damping-force characteristics to a soft side when a direction of a stroke of the damping-force adjustable shock absorber is reversed between an extension stroke and a contraction stroke.
    Type: Application
    Filed: November 29, 2010
    Publication date: June 2, 2011
    Inventors: Ryusuke HIRAO, Takashi Nezu, Nobuyuki Ichimaru, Takahide Kobayashi
  • Publication number: 20110035089
    Abstract: The present invention provides a suspension control apparatus enabling a driver to obtain an excellent driving feeling. A suspension control apparatus according to the present invention controls an actuator disposed between a vehicle body and a wheel of a vehicle. The suspension control apparatus comprises a lateral acceleration detector operable to detect a lateral acceleration, a lateral jerk detector operable to detect a lateral jerk, and a suspension controller operable to control the actuator to change a pitch of the vehicle based the detected lateral acceleration and lateral jerk.
    Type: Application
    Filed: April 22, 2010
    Publication date: February 10, 2011
    Inventors: Ryusuke Hirao, Masaaki Uchiyama, Nobuyuki Ichimaru, Takahide Kobayashi
  • Publication number: 20090085309
    Abstract: The present invention provides a suspension control apparatus requiring a reduced number of sensors. A pitch rate estimating unit 21 calculates a pitch rate used for creating a control instruction value, with use of a wheel-speed time-rate-of change obtained based on wheel speeds vcFL and vcFR detected by wheel speed sensors 7FL and 7FR, and an estimated forward/backward acceleration aes calculated by a forward/backward acceleration estimating unit 20.
    Type: Application
    Filed: September 24, 2008
    Publication date: April 2, 2009
    Inventors: Ryusuke Hirao, Takahide Kobayashi, Nobushige Wakamatsu
  • Publication number: 20070192030
    Abstract: A collision between a vehicle and an obstacle is estimated, and based on the estimation result, vehicle deceleration control is performed by a brake actuator to reduce the collision and vehicle wheel load is controlled by a suspension actuator.
    Type: Application
    Filed: January 19, 2007
    Publication date: August 16, 2007
    Applicant: Hitachi, Ltd.
    Inventors: Taisetsu Tanimichi, Tatsuya Yoshida, Mikio Ueyama, Shinya Ohtsuji, Isa Ismet Khumaedi, Takahide Kobayashi, Koji Fukui, Nobuyuki Ichimaru, Yoichi Kumemura, Shuichiro Kuroiwa, Masaaki Uchiyama, Tatsuya Gankai, Ryusuke Hirao