Rollover stability control for an automotive vehicle using rear wheel steering and brake control
First Claim
1. A rollover control system for an automotive vehicle having a front steering system and a rear steering system comprising:
- a rear wheel actuator;
a rear wheel position sensor generating a rear wheel position signal;
a brake actuator;
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 position sensor, said rollover sensor, said rear wheel actuator, and said brake actuator, said controller generating a rear wheel actuator signal and brake actuator signal in response to said rollover signal, said rear wheel actuator signal controlling said rear steering actuator and the brake actuator to prevent the vehicle from rolling over.
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Accused Products
Abstract
A stability control system (24) for an automotive vehicle includes a rollover sensor that may include one or more sensor to a various dynamic conditions of the vehicle and a controller to control 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), front steering angle sensor (35), pitch rate (38), rear steering position sensor (40), and a longitudinal acceleration sensor (36). The controller (26) determines a roll angle estimate in response at least one or more of the signals. The controller (26) changes a tire force vector using by changing the direction and or force of the rear steering actuator and brakes in response to the likelihood of rollover.
126 Citations
18 Claims
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1. A rollover control system for an automotive vehicle having a front steering system and a rear steering system comprising:
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a rear wheel actuator;
a rear wheel position sensor generating a rear wheel position signal;
a brake actuator;
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 position sensor, said rollover sensor, said rear wheel actuator, and said brake actuator, said controller generating a rear wheel actuator signal and brake actuator signal in response to said rollover signal, said rear wheel actuator signal controlling said rear steering actuator and the brake actuator to prevent the vehicle from rolling over. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of controlling roll stability of an automotive 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 and a brake controller to form a predetermined tire force vector in response to the relative roll angle estimate. - View Dependent Claims (9, 10, 11, 12, 13, 14)
determining a yaw rate for the vehicle;
determining a roll rate for the vehicle;
determining a lateral acceleration for the vehicle; and
determining vehicle speed.
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11. A method as recited in claim 8 wherein the step of controlling comprises the steps of determining a roll moment distribution from a brake system and from a steering system.
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12. A method as recited in claim 8 wherein the automotive vehicle comprises an antilock brake system generating an antilock brake signal and a traction control system generating a traction control signal, and further comprising the steps of generating a brake actuator signal in response to said rollover signal, said antilock brake signal, and said traction control signal, said controller generating a rear wheel actuator signal in response to said rollover signal, said rear wheel actuator signal controlling said rear steering actuator and said brake actuator signal controlling said brake actuator to prevent the vehicle from rolling over.
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13. A method as recited in claim 12 wherein a yaw stability control system (YSC) controller is coupled to said brake pressure priority logic, further comprising the step of generating a YSC brake control signal in said YSC controller, generating a brake actuator signal in said brake pressure priority logic in response to said rollover signal, said antilock brake signal, said traction control signal and said YSC brake control signal.
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14. A method as recited in claim 8 further comprising rear wheel steering priority logic, generating said rear wheel actuator signal in response to said rollover signal and said YSC rear steering signal.
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15. An automotive vehicle comprising:
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an antilock brake controller generating an antilock brake signal;
a traction controller generating a traction control brake signal;
a front steering system;
a rear steering system having a rear wheel actuator and a rear wheel position sensor generating a rear wheel position signal;
a brake actuator;
a rollover sensor for producing a rollover signal in response to an impending rollover of the vehicle; and
a rollover controller coupled to said rear wheel steering sensor, said rollover sensor, said rear wheel actuator, and said brake actuator, said rollover controller having brake pressure priority logic generating a brake actuator signal in response to said rollover signal, said antilock brake signal, and said traction control signal, said controller generating a rear wheel actuator signal in response to said rollover signal, said rear wheel actuator signal controlling said rear steering actuator and said brake actuator signal controlling said brake actuator to prevent the vehicle from rolling over. - View Dependent Claims (16, 17, 18)
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Specification