Roll over stability control for an automotive vehicle having rear wheel steering
First Claim
1. A stability control system for an automotive vehicle having a front steering system and a rear steering system comprising:
- a rear wheel steering actuator;
a rear wheel position sensor generating a rear wheel position signal;
a rollover sensor for producing a rollover signal in response to an impending rollover of the vehicle; and
a controller coupled to said rear wheel steering sensor, said rollover sensor, and said rear wheel steering actuator, said controller generating a rear wheel steering actuator signal in response to said rollover signal, said rear wheel steering actuator signal controlling said rear steering actuator to prevent the vehicle from rolling over.
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0 Petitions
Accused Products
Abstract
A stability control system (24) for an automotive vehicle as includes a plurality of sensors (28-39) sensing the dynamic conditions of the vehicle and a controller controls a steering force to reduce a tire moment so the net moment of the vehicle is counter to the roll direction. The sensors may include a speed sensor (30), a lateral acceleration sensor (32), a roll rate sensor (34), a yaw rate sensor (20) and a longitudinal acceleration sensor (36). The controller (26) is coupled to the speed sensor (30), the lateral acceleration sensor (32), the roll rate sensor (34), the yaw rate sensor (28) and a longitudinal acceleration sensor (36). The controller (26) determines a roll angle estimate in response to lateral acceleration, longitudinal acceleration, roll rate, vehicle speed, and yaw rate. The controller (26) changes a tire force vector using by changing the direction and/or force of the steering actuator in response to the relative roll angle estimate.
180 Citations
21 Claims
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1. A stability control system for an automotive vehicle having a front steering system and a rear steering system comprising:
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a rear wheel steering actuator;
a rear wheel position sensor generating a rear wheel position signal;
a rollover sensor for producing a rollover signal in response to an impending rollover of the vehicle; and
a controller coupled to said rear wheel steering sensor, said rollover sensor, and said rear wheel steering actuator, said controller generating a rear wheel steering actuator signal in response to said rollover signal, said rear wheel steering actuator signal controlling said rear steering actuator to prevent the vehicle from rolling over. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of controlling roll stability of a vehicle rear wheel steering actuator comprising:
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sensing the position of the rear wheel steering actuator;
sensing an impending rollover; and
generating a tire moment counter to a roll direction by controlling the rear wheel steering actuator in response to said impending rollover and said position of the rear wheel steering actuator. - View Dependent Claims (12, 13)
determining a roll rate for the vehicle;
determining a lateral acceleration for the vehicle;
determining a relative load at one corner of the vehicle.
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14. A method of controlling roll stability of a vehicle having a rear steering system comprising the steps of:
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determining a roll angle estimate in response to a rollover sensor; and
controlling a rear steering actuator to change a tire force vector in response to the relative roll angle estimate. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
sensing the position of a front wheel steering actuator; and
generating the tire moment counter to the roll direction by controlling the front wheel steering actuator in response to said impending rollover and said position of the front wheel steering actuator.
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16. A method as recited in claim 14 wherein the step of generating comprises controlling a brake.
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17. A method as recited in claim 14 wherein said vehicle comprises a right rear actuator and a left rear actuator and said step of generating comprises generating a tire moment by changing a relative direction between said right rear actuator and said left rear actuator.
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18. A method as recited in claim 14 wherein said step of determining a roll angle estimate comprises at least one step selected from the group of:
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determining a roll rate for the vehicle;
determining a lateral acceleration for the vehicle;
determining a relative load at one corner of the vehicle.
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19. A method as recited in claim 14 wherein controlling comprises controlling the rear actuator and a front actuator to change the tire force vector in response to the relative roll angle estimate.
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20. A method as recited in claim 14 wherein controlling comprises controlling the rear actuator, a front actuator and a brake actuator to change the tire force vector in response to the relative roll angle estimate.
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21. A method as recited in claim 14 wherein controlling comprises controlling the rear actuator and a brake actuator to change the tire force vector in response to the relative roll angle estimate.
Specification