Active wheel steering control
First Claim
1. A control system for providing active rear-wheel steering for a vehicle, said system comprising:
- an open-loop controller for generating an open-loop steering control signal;
a yaw rate feedback controller for generating a yaw rate feedback signal, said yaw rate feedback controller including a yaw rate proportional control process block that generates a rear-wheel steering proportional control signal for determining the yaw rate feedback signal, wherein the yaw rate proportional control process block determines the rear-wheel steering proportional control signal based on at least one wheel longitudinal slip input signal from one or more of wheel speed, automatic braking system on or off, and traction control system on or off;
a side-slip rate feedback controller for generating a side-slip rate feedback signal, said side-slip rate feedback controller including a side-slip rate proportional control process block that generates a side-slip rate control component signal for determining the side-slip rate feedback signal, wherein the side-slip rate proportional control process block determines the side-slip rate control component signal based on at least one wheel longitudinal slip input signal from one or more of wheel speed, automatic braking system on or off, and traction control system on or off; and
a combiner for combining the open-loop steering control signal, the yaw rate feedback signal and the side-slip rate feedback signal to generate a rear-wheel steering control signal for steering the rear wheels of the vehicle.
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Accused Products
Abstract
A control system that employs closed-loop control for providing active vehicle rear-wheel steering, where the control system receives longitudinal wheel slip inputs to improve the vehicle directional stability. The longitudinal wheel slip inputs can be from one or more of wheel speed, traction control on and automatic braking system on. The control system includes an open-loop controller for generating an open-loop steering control signal, a yaw rate feedback controller for generating a yaw rate feedback signal, and a side-slip rate controller for generating a side-slip rate feedback signal. The open-loop steering control signal, the yaw rate feedback signal and the side-slip rate feedback signal are combined to generate the steering control signal to steer the vehicle rear wheels.
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Citations
27 Claims
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1. A control system for providing active rear-wheel steering for a vehicle, said system comprising:
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an open-loop controller for generating an open-loop steering control signal;
a yaw rate feedback controller for generating a yaw rate feedback signal, said yaw rate feedback controller including a yaw rate proportional control process block that generates a rear-wheel steering proportional control signal for determining the yaw rate feedback signal, wherein the yaw rate proportional control process block determines the rear-wheel steering proportional control signal based on at least one wheel longitudinal slip input signal from one or more of wheel speed, automatic braking system on or off, and traction control system on or off;
a side-slip rate feedback controller for generating a side-slip rate feedback signal, said side-slip rate feedback controller including a side-slip rate proportional control process block that generates a side-slip rate control component signal for determining the side-slip rate feedback signal, wherein the side-slip rate proportional control process block determines the side-slip rate control component signal based on at least one wheel longitudinal slip input signal from one or more of wheel speed, automatic braking system on or off, and traction control system on or off; and
a combiner for combining the open-loop steering control signal, the yaw rate feedback signal and the side-slip rate feedback signal to generate a rear-wheel steering control signal for steering the rear wheels of the vehicle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A control system for providing active steering for a vehicle, said system comprising:
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an open-loop controller for generating an open-loop steering control signal;
a yaw rate feedback controller for generating a yaw rate feedback signal based on a yaw rate error signal and at least one longitudinal wheel slip input value, said yaw rate error signal being the difference between a commanded yaw rate signal and a yaw rate measurement signal;
a side-slip rate feedback controller for generating a side-slip rate feedback signal based on at least one longitudinal wheel slip input value, a lateral acceleration signal, the yaw rate measurement signal and a vehicle speed signal; and
a combiner for combining the open-loop steering control signal, the yaw rate feedback signal and the side-slip rate feedback signal to generate a wheel steering control signal to steer the vehicle wheels. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A method for active steering of the rear-wheels of -a vehicle, said method comprising:
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generating an open-loop steering control signal;
generating a yaw rate feedback signal based on wheel longitudinal slip;
generating a side-slip rate feedback signal based on the wheel longitudinal slip; and
combining the open-loop steering control signal, the yaw rate feedback signal and the side-slip rate feedback signal to generate a rear-wheel steering control signal to steer the vehicle'"'"'s rear wheels. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27)
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Specification