Vehicle Roll Mitigation Through Wheel Slip Controls
First Claim
1. A method for counteracting a roll moment in a vehicle rollover event, the method comprising the steps of:
- detecting a potential occurrence of said rollover event over an outside wheel, said potential rollover occurrence event being detected when a tire lateral force is greater than a lateral acceleration force; and
applying a braking torque to at least one outside wheel for producing a longitudinal wheel slip on said at least one outside wheel wherein said longitudinal wheel slip increases a longitudinal force acting on said at least one outside wheel which reduces a peak lateral friction between a tire coupled to said at least one outside wheel and an underlying road surface in order to reduce said peak lateral friction and said roll moment.
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Abstract
A method is provided for counteracting a roll moment in a vehicle rollover event. A potential occurrence of the rollover event is detected over an outside wheel. The potential rollover occurrence event is detected when a tire lateral force is greater than a lateral acceleration force. A braking torque is applied to at least one outside wheel (rear outside, front outside or both outside wheels) for producing a longitudinal wheel slip on the at least one outside wheel wherein the longitudinal wheel slip increases a longitudinal force acting on the at least one outside wheel, cooperatively producing a vehicle yaw for off setting an oversteering condition. The peak lateral friction is reduced between a tire coupled to the at least one outside wheel and an underlying road surface in order to reduce the peak lateral friction and the roll moment.
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Citations
14 Claims
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1. A method for counteracting a roll moment in a vehicle rollover event, the method comprising the steps of:
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detecting a potential occurrence of said rollover event over an outside wheel, said potential rollover occurrence event being detected when a tire lateral force is greater than a lateral acceleration force; and applying a braking torque to at least one outside wheel for producing a longitudinal wheel slip on said at least one outside wheel wherein said longitudinal wheel slip increases a longitudinal force acting on said at least one outside wheel which reduces a peak lateral friction between a tire coupled to said at least one outside wheel and an underlying road surface in order to reduce said peak lateral friction and said roll moment. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A rollover mitigation system for counteracting a roll moment in a rollover event of a vehicle, the system comprising:
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a vehicle braking system including a plurality of vehicle brake actuators for acting upon a plurality of vehicle wheels, each respective brake being independently actuable upon an associated vehicle wheel for applying braking torque to said associated vehicle wheel; a plurality of sensors for sensing vehicle operating conditions; a controller for determining a potential rollover event in response to said sensed operating conditions; and a vehicle specific dynamic model for providing vehicle specific characteristics to said controller; wherein said controller determines a braking strategy and controls a braking torque applied to one of said outside wheels for producing a longitudinal wheel slip between a tire coupled to said wheel and an underlying road surface for mitigating said roll moment. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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Specification