Method and apparatus for vehicle rollover mitigation
First Claim
1. A method for detecting a potential for a vehicle rollover event, the method comprising the steps of:
- determining a lateral kinetic energy of the vehicle based on vehicle longitudinal velocity and vehicle side slip angle;
measuring a lateral acceleration of the vehicle;
measuring a tire load;
determining a rollover potentiality index based on the lateral kinetic energy and the lateral acceleration;
determining a rollover index by weighting the rollover potentiality index by a factor of the lateral acceleration and a factor of the tire load;
determining if the rollover index is above a predetermined threshold; and
outputting an indication based on the above-determined indexes to a controller adapted to provide a control action in response thereto;
wherein the measured tire load, which is used in determining the rollover index, is determined by measuring a length of a contact patch of a vehicle tire and measuring changes to the contact patch length and;
further comprising the step of providing a control signal from a controller configured to output a control signal to a system of the vehicle to implement corrective action to reduce the potential of an actual rollover when the rollover index is above a predetermined threshold.
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Accused Products
Abstract
A method is provided for detecting a rollover event of a vehicle. A lateral kinetic energy of the vehicle is determined in response to vehicle longitudinal velocity and vehicle side slip angle. A lateral acceleration of the vehicle is measured. A tire normal force is measured. A rollover potentiality index is determined in response to the lateral kinetic energy and the lateral acceleration. A rollover index is determined by weighting the rollover potentiality index by a factor of the lateral acceleration and by a factor of the tire normal force. A comparison is made to determine if the rollover index is above a predetermined threshold.
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Citations
8 Claims
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1. A method for detecting a potential for a vehicle rollover event, the method comprising the steps of:
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determining a lateral kinetic energy of the vehicle based on vehicle longitudinal velocity and vehicle side slip angle; measuring a lateral acceleration of the vehicle; measuring a tire load; determining a rollover potentiality index based on the lateral kinetic energy and the lateral acceleration; determining a rollover index by weighting the rollover potentiality index by a factor of the lateral acceleration and a factor of the tire load; determining if the rollover index is above a predetermined threshold; and outputting an indication based on the above-determined indexes to a controller adapted to provide a control action in response thereto; wherein the measured tire load, which is used in determining the rollover index, is determined by measuring a length of a contact patch of a vehicle tire and measuring changes to the contact patch length and; further comprising the step of providing a control signal from a controller configured to output a control signal to a system of the vehicle to implement corrective action to reduce the potential of an actual rollover when the rollover index is above a predetermined threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification