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Method for measuring vertical acceleration and velocity of semi-active suspension system

  • US 7,627,408 B2
  • Filed: 11/02/2005
  • Issued: 12/01/2009
  • Est. Priority Date: 11/02/2005
  • Status: Active Grant
First Claim
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1. A method for controlling a semi-active suspension system, wherein the semi-active suspension system comprises the first to third vertical acceleration sensors which are installed adjacent to three of the four dampers of the vehicle body, the method comprises the steps of:

  • receiving first to third vertical accelerations measured from first to third vertical acceleration sensors;

    obtaining a vertical aeceleration value (Ad) at the position of the fourth damper using said first to third vertical accelerations and the correction constants α

    , β

    , γ

    at the position of the fourth damper where any vertical acceleration sensor is not installed adjacently, wherein the correction constants at the position of the fourth damper is obtained from x and y position value of the fourth damper and X and Y position values of the first to the third acceleration sensors; and

    controlling damping forces of the first to fourth dampers according to vertical acceleration values including said vertical acceleration value (Ad) at the position of the fourth damper wherein the vertical Acceleration value (Ad) is obtained from the following equation;


    Ad=α

    ×

    Aa
    1+β

    ×

    Aa2+γ

    ×

    Aa3and, the correction constants α

    , β and

    γ

    are obtained from the following equation;

    α



    ( x , y )
    = ( Y 2 - Y 3 )

    x
    + ( X 3 - X 2 )

    y
    + X 2

    Y 3
    - X 3

    Y 2
    ( X 1 - X 2 )

    ( Y 1 - Y 3 )
    - ( X 1 - X 3 )

    ( Y 1 - Y 2 )
    β



    ( x , y )
    = ( Y 3 - Y 1 )

    x
    + ( X 1 - X 3 )

    y
    + X 3

    Y 1
    - X 1

    Y 3
    ( X 1 - X 2 )

    ( Y 1 - Y 3 )
    - ( X 1 - X 3 )

    ( Y 1 - Y 2 )
    γ



    ( x , y )
    = ( Y 1 - Y 2 )

    x
    + ( X 2 - X 1 )

    y
    + X 1

    Y 2
    - X 2

    Y 1
    ( X 1 - X 2 )

    ( Y 1 - Y 3 )
    - ( X 1 - X 3 )

    ( Y 1 - Y 2 )
    ,
    where X1, X2 and X3 are X position coordinate values of the first to third vertical acceleration sensors, Y1, Y2 and Y3 are Y position coordinate values of the first to third vertical acceleration sensors, and x and y are X and Y position coordinate values of the fourth damper where any vertical acceleration sensor is not installed adjacently.

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