Enhanced roll stability indicator for vehicle rollover control
First Claim
1. A method for generating a roll stability indicator for indicating the likelihood that a vehicle will tip-up or rollover, said method comprising:
- providing a roll rate signal of the roll rate of the vehicle;
providing a yaw rate signal of the yaw rate of the vehicle;
providing a lateral acceleration signal of the lateral acceleration of the vehicle;
providing a speed signal of the speed of the vehicle;
providing a hand-wheel angle signal of the angle of the hand-wheel of the vehicle;
estimating a roll angle signal of the vehicle based on one or more of the roll rate signal, the yaw rate signal, the lateral acceleration signal, the speed signal and the hand-wheel angle signal;
estimating a bank angle signal of the vehicle from one or more of the roll rate signal, the yaw rate signal, the lateral acceleration signal, the vehicle speed signal and the hand-wheel angle signal;
correcting the roll angle signal based on the estimated bank angle signal to provide a corrected roll angle signal;
calculating a roll energy signal based on the corrected roll angle signal;
calculating a roll energy rate signal based on the roll energy signal;
determining a critical energy signal and a critical energy rate signal;
determining a tire lateral load transfer signal between the loads on tires of the vehicle;
determining a duration signal of how long one of the vehicle tires has been off the ground; and
calculating the roll stability indicator based on the roll energy signal, the roll energy rate signal, the critical energy signal, the critical energy rate signal, the tire lateral load transfer signal and the duration signal.
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Accused Products
Abstract
A system and method for providing a vehicle roll stability indicator that dynamically estimates the probability for vehicle rollover. The system determines vehicle kinematics from various vehicle sensors. From these kinematic values, the system estimates a roll angle of the vehicle and a bank angle of the vehicle. The estimated bank angle is used to correct the roll angle. The system determines a roll energy of the vehicle and a roll energy rate of the vehicle from the corrected roll angle. The system also calculates a tire lateral load transfer of the relative forces on the vehicle tires, and the duration that any of the tires have been off of the ground. From the roll energy, the roll energy rate, the tire lateral load transfer and the wheel airborne duration, the system calculates the roll stability indicator.
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Citations
26 Claims
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1. A method for generating a roll stability indicator for indicating the likelihood that a vehicle will tip-up or rollover, said method comprising:
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providing a roll rate signal of the roll rate of the vehicle; providing a yaw rate signal of the yaw rate of the vehicle; providing a lateral acceleration signal of the lateral acceleration of the vehicle; providing a speed signal of the speed of the vehicle; providing a hand-wheel angle signal of the angle of the hand-wheel of the vehicle; estimating a roll angle signal of the vehicle based on one or more of the roll rate signal, the yaw rate signal, the lateral acceleration signal, the speed signal and the hand-wheel angle signal; estimating a bank angle signal of the vehicle from one or more of the roll rate signal, the yaw rate signal, the lateral acceleration signal, the vehicle speed signal and the hand-wheel angle signal; correcting the roll angle signal based on the estimated bank angle signal to provide a corrected roll angle signal; calculating a roll energy signal based on the corrected roll angle signal; calculating a roll energy rate signal based on the roll energy signal; determining a critical energy signal and a critical energy rate signal; determining a tire lateral load transfer signal between the loads on tires of the vehicle; determining a duration signal of how long one of the vehicle tires has been off the ground; and calculating the roll stability indicator based on the roll energy signal, the roll energy rate signal, the critical energy signal, the critical energy rate signal, the tire lateral load transfer signal and the duration signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for generating a roll stability indicator for indicating the likelihood that a vehicle will tip-up or roll over, said method comprising:
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providing vehicle kinematics signals; estimating a roll angle signal of the vehicle from the vehicle kinematics signals; calculating a roll energy signal based on the estimated roll angle signal; calculating a roll energy rate signal based on the roll energy signal; determining a tire lateral load transfer signal between the loads on tires of the vehicle; determining a duration signal of how long one of the vehicle tires has been off the ground; and calculating the roll stability indicator using the roll energy signal, the roll energy rate signal, the tire lateral load transfer signal and the duration signal. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A system for generating a roll stability indicator that indicates the likelihood that a vehicle will tip-up or roll over, said system comprising:
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a plurality of vehicle sensors for providing vehicle kinematics information; means for estimating a roll angle signal of the vehicle from the vehicle kinematics information; means for calculating a roll energy signal based on the estimated roll angle signal; means for calculating a roll energy rate signal based on the roll energy signal; means for determining a tire lateral load transfer signal; means for determining a wheel airborne duration signal; and means for calculating the roll stability indicator using the roll energy signal, the roll energy rate signal, the tire lateral load transfer signal and wheel airborne duration signal. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification