Active front steer control for vehicle stability enhancement
First Claim
1. A method for providing active front steering for a vehicle, said method comprising:
- providing a vehicle speed signal of the vehicle;
providing a lateral acceleration signal of the lateral acceleration of the vehicle;
providing an actual yaw rate signal of the actual yaw rate of the vehicle;
providing a steering angle signal indicative of the vehicle operator'"'"'s desired steering direction;
determining a desired yaw rate of the vehicle based on the steering angle signal and the vehicle speed signal;
determining a desired side-slip rate of the vehicle based on the steering angle signal and the vehicle speed signal;
determining a yaw rate feedback signal based on the desired yaw rate signal and the actual yaw rate signal;
determining a side-slip rate feedback signal based on the desired side-slip rate signal, the vehicle speed signal, the vehicle yaw rate signal and the vehicle lateral acceleration signal; and
integrating the yaw rate feedback signal and the side-slip rate feedback signal to generate a stability enhancement control signal used for providing the active front steering of the vehicle, wherein integrating the yaw rate feedback signal and the side-slip rate feedback signal includes weighting one or both of the yaw rate feedback signal and the side-slip rate feedback signal.
12 Assignments
0 Petitions
Accused Products
Abstract
An AFS control system that combines and weights yaw rate feedback and side-slip rate feedback to provide increased vehicle stability enhancement control. The AFS system includes a yaw rate sub-system that generates a desired yaw rate signal. The AFS system also includes a side-slip rate sub-system that generates a desired side-slip rate feedback signal. The AFS system further includes a side-slip rate feedback sub-system that generates a side-slip rate feedback signal. The AFS system also includes a yaw rate feedback sub-system that generates a yaw rate feedback signal. The yaw rate feedback signal and the side-slip rate feedback signal are integrated in a control integration sub-system that generates a stability enhancement control signal. The control integration sub-system determines whether the vehicle is in an oversteer or understeer condition, and weights the desired yaw rate feedback signal accordingly based on the vehicle condition.
-
Citations
20 Claims
-
1. A method for providing active front steering for a vehicle, said method comprising:
-
providing a vehicle speed signal of the vehicle;
providing a lateral acceleration signal of the lateral acceleration of the vehicle;
providing an actual yaw rate signal of the actual yaw rate of the vehicle;
providing a steering angle signal indicative of the vehicle operator'"'"'s desired steering direction;
determining a desired yaw rate of the vehicle based on the steering angle signal and the vehicle speed signal;
determining a desired side-slip rate of the vehicle based on the steering angle signal and the vehicle speed signal;
determining a yaw rate feedback signal based on the desired yaw rate signal and the actual yaw rate signal;
determining a side-slip rate feedback signal based on the desired side-slip rate signal, the vehicle speed signal, the vehicle yaw rate signal and the vehicle lateral acceleration signal; and
integrating the yaw rate feedback signal and the side-slip rate feedback signal to generate a stability enhancement control signal used for providing the active front steering of the vehicle, wherein integrating the yaw rate feedback signal and the side-slip rate feedback signal includes weighting one or both of the yaw rate feedback signal and the side-slip rate feedback signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. An active front steering system for a vehicle, said system comprising:
-
a hand-wheel sensor for generating a steering angle signal indicative of a vehicle operator'"'"'s intended steering direction;
a vehicle speed sensor for providing a vehicle speed signal of the speed of the vehicle;
a yaw rate sensor for providing an actual yaw rate signal of the yaw rate of the vehicle;
a lateral acceleration sub-system for providing a lateral acceleration signal of the lateral acceleration of the vehicle;
a yaw rate command sub-system responsive to the steering angle signal and the vehicle speed signal, said yaw rate command sub-system generating a desired yaw rate signal;
a side-slip rate sub-system responsive to the steering angle signal and the vehicle speed signal, said side-slip rate sub-system generating a desired side-slip rate signal;
a yaw rate feedback sub-system responsive to the desired yaw rate signal and the actual yaw rate signal, said yaw rate feedback sub-system generating a yaw rate feedback signal;
a side-slip rate feedback sub-system responsive to the lateral acceleration signal, the actual yaw rate signal, the vehicle speed signal and the desired side-slip rate signal, said side-slip rate feedback sub-system providing a side-slip rate feedback signal; and
a control integration sub-system responsive to the yaw rate feedback signal and the side-slip rate feedback signal, said control integration sub-system weighting the yaw rate feedback signal and/or the side-slip rate feedback signal to provide a stability enhancement control signal for controlling the front steering of the vehicle. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
-
-
19. An active front steering system for a vehicle, said system comprising:
-
a yaw rate feedback sub-system responsive to a desired yaw rate signal and an actual yaw rate signal, said yaw rate feedback sub-system generating a yaw rate feedback signal;
a side-slip rate feedback sub-system responsive to a lateral acceleration signal, a yaw rate signal, the vehicle speed signal and a desired side-slip rate signal, said side-slip rate feedback sub-system providing a side-slip rate feedback signal; and
a control integration sub-system responsive to the yaw rate feedback signal and the side-slip rate feedback signal, said control integration sub-system weighting the yaw rate feedback signal and/or the side-slip rate feedback signal to provide a stability enhancement control signal for controlling the front steering of the vehicle. - View Dependent Claims (20)
-
Specification