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.
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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, 16, 17, 18)
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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.
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Specification