US 7,627,408 B2Granted

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

AssigneeMando Corporation

InventorsWan Il Kim, Jeong Woo Lee

Life of this patent

Estimating the term…

Loading patent…

Abstract

The present invention relates to a method for measuring a vertical acceleration and a velocity of a semi-active suspension system. Particularly, the present invention provides a method for obtaining a vertical acceleration from vertical accelerations measured from three vertical acceleration sensors of a semi-active suspension system of a vehicle, comprising the steps of: receiving first to third vertical accelerations measured from first to third vertical acceleration sensors; and obtaining a fourth vertical acceleration (Ad) by multiplying the first to third vertical accelerations by correction constants and subsequently summing up them. Therefore, according to the present invention, a fourth vertical acceleration can be obtained by multiplying the three vertical accelerations measured from the three acceleration sensors by the constants for correcting them to accelerations at actually desired damper positions and subsequently summing up them, thereby enabling accurate measurement and correction of the vertical accelerations.

Claims4

Dependent claims

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×Aa1+β×Aa2+γ×Aa3
and, 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.

215 more elements

A method for controlling a semi-active suspension system, wherein the semi-active suspension system comprises the first to third velocity 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 velocities measured from first to velocity sensors;
obtaining a velocity value (Vd) at the position of the fourth damper using said first to third velocities and the correction constants α, β and γ at the position of the fourth damper where any velocity 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 velocity sensors;
and
controlling damping forces of the first to fourth dampers according to velocity values including said velocity value (Vd) at the position of the fourth damper wherein the velocity value (Vd) is obtained from the following equation:
Vd=α×Vα1+β×Vα2+γ×Vα3
and, 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 velocity sensors, Y1, Y2 and Y3 are Y position coordinate values of the first to third velocity sensors, and x and y are X and Y position coordinate values of the fourth damper where any velocity sensor is not installed adjacently.

215 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/264,128Filed 2 Nov 2005
Published: US 2007/0100522 A13 May 2007
Granted: 1 Dec 2009
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

B60G 17/0152
The regulating means comprising electric or electronic elements: characterised by the action on a particular type of suspension unit
B60G 17/01908
Characterised by the type of sensor or the arrangement thereof: acceleration or inclination sensors
B60G 2400/102
Acceleration; Deceleration: vertical
B60G 2500/10
Indexing codes relating to the regulated action or device: damping action or damper