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Seat device for vehicle

  • US 10,173,552 B2
  • Filed: 09/10/2014
  • Issued: 01/08/2019
  • Est. Priority Date: 09/10/2013
  • Status: Active Grant
First Claim
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1. A vehicle seat apparatus comprising:

  • a seat including a seat cushion and a seat back, the seat back including a shaft, andthe seat cushion including a bearing portion configured to allow the shaft to be rotatably supported therein, wherein the seat back is configured to be capable of swiveling to a left or to a right relative to the seat cushion;

    an actuator capable of changing an orientation of an entire body of the seat back to the left or to the right relative to the seat cushion; and

    a controller configured to control the actuator,wherein the controller includes;

    a lateral acceleration acquisition unit configured to acquire a lateral acceleration;

    a steering velocity acquisition unit configured to acquire a steering velocity; and

    a posture control unit configured to exercise a seat posture control over the actuator based on the lateral acceleration acquired by the lateral acceleration acquisition unit and the steering velocity acquired by the steering velocity acquisition unit, to change the orientation of the entire body of the seat back to the left or to the right relative to the seat cushion,the posture control unit is configured;

    to activate the seat posture control when a magnitude of the lateral acceleration becomes greater than a first acceleration threshold value, as well asto activate the seat posture control on conditions that the steering velocity has a magnitude greater than a steering velocity threshold value and a direction of the lateral acceleration is opposite to a direction of the steering velocity and when the magnitude of the lateral acceleration becomes greater than a second acceleration threshold value which is smaller than the first acceleration threshold value,the actuator is configured to move an entire assembly of the seat cushion and the seat back of the vehicle seat relative to a vehicle in which the vehicle seat is installed,the lateral acceleration acquisition unit is configured to acquire the lateral acceleration by computation based on a vehicle velocity and a steering angle,the lateral acceleration acquisition unit is configured to compute the lateral acceleration GC by;


    R=(1+AV2)/(L

    )
    GC=V2/R whereA;

    Stability factor, a vehicle-specific constantV;

    Vehicle velocityL;

    Wheelbase of a vehicleφ

    ;

    Steering angleR;

    Turning radius, andthe seal cushion is configured to be adjusted based on the lateral acceleration formula R=(1+AV2)/(L/φ

    ).

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