Rear wheel steering device for a vehicle
First Claim
1. A rear wheel steering device for a vehicle having steering control means for steering rear wheels in accordance with the formula,
whereTGθ
.sub.R =-K.sub.F ·
θ
.sub.F +K.sub.R ·
V·
ψ
R ;
a target steering angle of the rear wheelsθ
F ;
a steering angle of the front wheelsV;
a vehicle speedψ
;
a yaw rateKF, KR ;
coefficients determined by the properties of the vehicle, comprising;
vehicle condition detecting means for detecting various conditions of the vehicle; and
changing means connected with said steering control means and said vehicle condition detecting means for changing at least one of the coefficients KF, KR depending on the conditions of the vehicle.
1 Assignment
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Accused Products
Abstract
A rear wheel steering device for a vehicle has a steering control mechanism which steers rear wheels of the vehicle on the following formula:
TGθ.sub.R =-K.sub.F ·θ.sub.F +K.sub.R
·V·ψ
where
TGθR : target steering angle of rear wheels
θF : steering angle of front wheels
V: vehicle speed
θ: yaw rate
KF, KR : coefficients determined by the properties of vehicle.
To achieve slip angle β=0, the device further includes a vehicle condition detecting mechanism which detects various conditions of the vehicle, and a changing mechanism being connected with the steering control mechanism and the vehicle condition detecting mechanism for changing at least one of the coefficients KF, KR based on the conditions of the vehicle.
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Citations
7 Claims
- 1. A rear wheel steering device for a vehicle having steering control means for steering rear wheels in accordance with the formula,
- space="preserve" listing-type="equation">TGθ
.sub.R =-K.sub.F ·
θ
.sub.F +K.sub.R ·
V·
ψ
where TGθ
R ;
a target steering angle of the rear wheelsθ
F ;
a steering angle of the front wheelsV;
a vehicle speedψ
;
a yaw rateKF, KR ;
coefficients determined by the properties of the vehicle, comprising;vehicle condition detecting means for detecting various conditions of the vehicle; and changing means connected with said steering control means and said vehicle condition detecting means for changing at least one of the coefficients KF, KR depending on the conditions of the vehicle. - View Dependent Claims (4, 5, 6, 7)
- space="preserve" listing-type="equation">TGθ
-
2. A rear wheel steering device for a vehicle as defined in claim wherein said vehicle condition detecting means is connected with a vehicle speed sensor, and said changing means incrementally changes at least the coefficient KF between the coefficients KF, KR with the increase in the vehicle speed V.
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3. A rear wheel steering device for a vehicle as defined in claim wherein said vehicle condition detecting means detects the acceleration and deceleration of the vehicle, and said changing means decreases the coefficient KF or increases the coefficient KR depending on the acceleration or deceleration of the vehicle.
Specification