Vehicle Stability Control System and Method
First Claim
1. A vehicle stability control system, comprising:
- a 5-sensor cluster;
a stability controller configured to communicate with the 5-sensor cluster and receive signals corresponding to a lateral acceleration, a longitudinal acceleration, a yaw rate, a roll rate, and a pitch rate from the 5-sensor cluster, the stability controller also configured to determine a braking amount or a throttle amount to maintain vehicle stability;
a brake controller configured to communicate with the stability controller and receive a braking request from the stability controller; and
a throttle controller configured to communicate with the stability controller and receive a throttle request from the stability controller.
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Accused Products
Abstract
A vehicle stability control system comprises a 5-sensor cluster and a stability controller configured to communicate with the 5-sensor cluster and receive signals corresponding to a lateral acceleration, a longitudinal acceleration, a yaw rate, a roll rate, and a pitch rate from the 5-sensor cluster. The stability controller can also be configured to determine a braking amount or a throttle amount to maintain vehicle stability. The system also comprises a brake controller configured to communicate with the stability controller and receive a braking request from the stability controller, and a throttle controller configured to communicate with the stability controller and receive a throttle request from the stability controller. The system may also comprise a braking or throttling command computed based on various scenarios detected by measured and calculated signals.
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Citations
23 Claims
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1. A vehicle stability control system, comprising:
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a 5-sensor cluster; a stability controller configured to communicate with the 5-sensor cluster and receive signals corresponding to a lateral acceleration, a longitudinal acceleration, a yaw rate, a roll rate, and a pitch rate from the 5-sensor cluster, the stability controller also configured to determine a braking amount or a throttle amount to maintain vehicle stability; a brake controller configured to communicate with the stability controller and receive a braking request from the stability controller; and a throttle controller configured to communicate with the stability controller and receive a throttle request from the stability controller. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 21)
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9. A method for performing hill hold control, the method comprising:
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receiving signals corresponding to a lateral acceleration, a longitudinal acceleration, a yaw rate, a roll rate, and a pitch rate; calculating a vehicle pitch angle from the lateral acceleration, the longitudinal acceleration, the yaw rate, the roll rate, and the pitch rate; calculating a road grade from the vehicle pitch angle; and determining whether to apply brakes of a vehicle based on the road grade, a vehicle speed or wheel speeds, a transmission status, a throttle input, and a brake status. - View Dependent Claims (10, 11, 12, 13)
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14. A method for maintaining a driver'"'"'s intended speed of a vehicle during hill driving, the method comprising:
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receiving signals corresponding to a lateral acceleration, a longitudinal acceleration, a yaw rate, a roll rate, and a pitch rate; calculating a vehicle pitch angle from the lateral acceleration, the longitudinal acceleration, the yaw rate, the roll rate, and the pitch rate; calculating a longitudinal velocity gradient from the vehicle pitch angle; determining whether the longitudinal velocity gradient is substantially close to zero; and changing a throttle input of the vehicle to change the vehicle'"'"'s velocity if the longitudinal velocity gradient is not substantially close to zero. - View Dependent Claims (15, 16)
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17. A method for maintaining a constant speed for a vehicle, the method comprising:
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receiving signals corresponding to a lateral acceleration, a longitudinal acceleration, a yaw rate, a roll rate, and a pitch rate; calculating a vehicle pitch angle from the lateral acceleration, the longitudinal acceleration, the yaw rate, the roll rate, and the pitch rate; calculating a longitudinal velocity gradient from the vehicle pitch angle; and maintaining the longitudinal velocity substantially at zero. - View Dependent Claims (18, 19, 20)
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22. A method for detecting a vehicle sliding into loss of control, the method comprising:
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receiving signals corresponding to a lateral acceleration, a longitudinal acceleration, a yaw rate, a roll rate, and a pitch rate; calculating a vehicle pitch angle from the lateral acceleration, the longitudinal acceleration, the yaw rate, the roll rate, and the pitch rate; calculating a longitudinal velocity gradient from the vehicle pitch angle; calculating a signed longitudinal velocity based on the longitudinal velocity gradient; calculating a sideslip angle; comparing the magnitude of the sideslip angle with a first threshold indicative of the vehicle'"'"'s motion trend; comparing the magnitude of the longitudinal velocity gradient with a second threshold indicative of lateral motion of the vehicle.
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23. A vehicle stability control system for controlling a vehicle'"'"'s sliding into loss of control, the system comprising:
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detecting the vehicle'"'"'s sliding into loss of control by comparing the vehicle'"'"'s longitudinal velocity gradient with a reference speed computed from wheel speed sensors inputs; detecting a lateral velocity of the vehicle and a longitudinal velocity of the vehicle when vehicle sliding is detected; calculating a sliding velocity vector of the vehicle from the lateral velocity of the vehicle and the longitudinal velocity of the vehicle; braking the vehicle such that tire forces of the vehicle are aligned in a direction opposite the vehicle sliding velocity vector to remove a sliding energy of the vehicle.
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Specification