Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Vehicle subsystem or accessory control
Reexamination Certificate
2011-03-22
2011-03-22
Tran, Khoi (Department: 3664)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Vehicle subsystem or accessory control
C701S001000, C701S036000, C701S042000, C180S408000, C180S411000, C180S413000
Reexamination Certificate
active
07912606
ABSTRACT:
Steering control system for a land vehicle with at least four steered wheels (1AvG,1AvD,1ArG,1ArD), the system comprising one actuator per steered wheel (3AvG,3AvD,3ArG,3ArD). The system comprises a control member (2) available to a driver and delivering a demanded steering angle (θ), a steering control unit (4) which, by way of input variable, uses at least the said demanded steering angel (θ) to determine a steering control angle for operating the said actuator, and means (5) for detecting a lock-up of one of the steered-wheel actuators, which are capable of delivering an alarm signal identifying an actuator that has locked up. The steering control unit has at least one normal mode and at least one degraded mode in the event of an actuator becoming locked up, the degraded mode calculating the steering control angle (αpi) of the non-locked wheels by imposing a first degraded-mode strategy whereby the instantaneous center of rotation (CIR) of the vehicle lies more or less on the straight line perpendicular to the plane of the locked wheel and passing through the center of the ground-contact area of the locked wheel, in a position that is dependent on the demanded steering angle (θ).
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Cohen Pontani Lieberman & Pavane LLP
Michelin Recherche ET Technique S.A.
Sample Jonathan L
Tran Khoi
LandOfFree
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