Roll stability indicator for vehicle rollover control
First Claim
1. A method for generating a roll stability indicator for indicating a 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; and
calculating the roll stability indicator based on the roll energy signal, the roll energy rate signal, the critical energy signal and the critical energy rate signal.
12 Assignments
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Accused Products
Abstract
A system and method for providing a vehicle roll stability indicator that estimates the propensity for vehicle rollover. The system determines vehicle kinematics from vehicle sensors, such as roll rate, yaw rate, lateral acceleration, vehicle speed, etc. From these kinematic values, the system estimates a roll angle of the vehicle and a bank angle of the vehicle. From the estimated bank angle, the system provides a corrected roll angle. From the corrected roll angle, the system determines a roll energy of the vehicle and a roll energy rate of the vehicle. From the roll energy and the roll energy rate, the system calculates a roll stability indicator that defines the potential that the vehicle will tip-up or roll over. From the roll stability indicator, vehicle stability control systems can take suitable action.
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Citations
28 Claims
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1. A method for generating a roll stability indicator for indicating a 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; and calculating the roll stability indicator based on the roll energy signal, the roll energy rate signal, the critical energy signal and the critical energy rate signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for generating a roll stability indicator for indicating a 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; and calculating the roll stability indicator using the roll energy signal and the roll energy rate signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A system for generating a roll stability indicator that indicates a likelihood that a vehicle will tip-up or roll over, said system including a plurality of vehicle sensors for providing vehicle kinematics information and computer-executable instructions for:
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estimating a roll angle signal of the vehicle from the vehicle kinematics information; calculating a roll energy signal based on the estimated roll angle signal; calculating a roll energy rate signal based on the roll energy signal; and calculating the roll stability indicator using the roll energy signal and the roll energy rate signal. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification