Vehicle Yaw/Roll Stability Control with Semi-Active Suspension
First Claim
1. A rollover avoidance system for changing the damping characteristics of suspension dampers at each wheel of a vehicle to mitigate a potential rollover condition, said system comprising:
- a speed sensor providing a vehicle parameter speed signal of the speed of the vehicle;
a roll rate sensor providing a vehicle parameter roll rate signal of the roll rate of the vehicle;
a lateral acceleration sensor for providing a vehicle parameter lateral acceleration signal of a lateral acceleration of the vehicle;
a yaw rate sensor for providing a vehicle parameter yaw rate signal of the yaw rate of the vehicle;
a hand-wheel angle sensor for providing a vehicle parameter hand-wheel angle signal of the angle of a vehicle hand-wheel;
a rollover indicator processor for calculating a roll stability indicator signal;
a dynamic command processor for generating a desired stability command signal based on the vehicle parameter signals for a desired stiffness of the dampers; and
a closed-loop controller responsive to vehicle parameter signals, the calculated roll stability indicator signal and the desired stability command signal, said closed-loop controller calculating an understeer or oversteer signal based on whether the vehicle is in an understeer or oversteer condition and a yaw stability control factor based on a yaw rate error signal and a side-slip error signal, said closed-loop controller further determining a roll error signal as the difference between the desired stability command signal and the calculated rollover stability indicator signal, said closed-loop controller also calculating a gain signal as a function of the vehicle speed signal, said closed-loop controller further calculating a closed-loop roll control factor based on the gain signal and the roll error signal, said closed-loop controller (70) also determining a front to rear damper distribution of the damping characteristics of the suspension dampers based on the yaw rate error signal and the understeer or oversteer signal, said closed-loop controller generating a damper suspension command signal for each damper based on the front to rear distribution signal and the closed-loop roll control factor or the yaw stability control factor.
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Accused Products
Abstract
A rollover avoidance system for changing the damping characteristics of suspension dampers at each wheel of a vehicle so as to mitigate the potential for vehicle rollover. The system includes a plurality of vehicle parameter sensors for measuring vehicle parameters and providing vehicle parameter signals. The system also includes a controller for generating a damper suspension command signal for each damper using the vehicle parameter signals. The controller considers a roll control factor representing a rollover condition of the vehicle and a yaw stability control factor representing a yaw condition of the vehicle to set the damping of the dampers to mitigate the potential for vehicle rollover.
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Citations
20 Claims
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1. A rollover avoidance system for changing the damping characteristics of suspension dampers at each wheel of a vehicle to mitigate a potential rollover condition, said system comprising:
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a speed sensor providing a vehicle parameter speed signal of the speed of the vehicle; a roll rate sensor providing a vehicle parameter roll rate signal of the roll rate of the vehicle; a lateral acceleration sensor for providing a vehicle parameter lateral acceleration signal of a lateral acceleration of the vehicle; a yaw rate sensor for providing a vehicle parameter yaw rate signal of the yaw rate of the vehicle; a hand-wheel angle sensor for providing a vehicle parameter hand-wheel angle signal of the angle of a vehicle hand-wheel; a rollover indicator processor for calculating a roll stability indicator signal; a dynamic command processor for generating a desired stability command signal based on the vehicle parameter signals for a desired stiffness of the dampers; and a closed-loop controller responsive to vehicle parameter signals, the calculated roll stability indicator signal and the desired stability command signal, said closed-loop controller calculating an understeer or oversteer signal based on whether the vehicle is in an understeer or oversteer condition and a yaw stability control factor based on a yaw rate error signal and a side-slip error signal, said closed-loop controller further determining a roll error signal as the difference between the desired stability command signal and the calculated rollover stability indicator signal, said closed-loop controller also calculating a gain signal as a function of the vehicle speed signal, said closed-loop controller further calculating a closed-loop roll control factor based on the gain signal and the roll error signal, said closed-loop controller (70) also determining a front to rear damper distribution of the damping characteristics of the suspension dampers based on the yaw rate error signal and the understeer or oversteer signal, said closed-loop controller generating a damper suspension command signal for each damper based on the front to rear distribution signal and the closed-loop roll control factor or the yaw stability control factor. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A rollover avoidance system for changing the damping characteristics of suspension dampers at each wheel of a vehicle to mitigate a potential rollover condition, said system comprising:
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a plurality of vehicle parameter sensors for measuring vehicle parameters and providing vehicle parameter signals; and a controller for generating a damper command signal for each damper, said controller being responsive to vehicle parameter signals and considering a total roll control factor representing a rollover condition of the vehicle and a yaw stability control factor representing a yaw condition of the vehicle to set the damping of the dampers to mitigate the potential for a vehicle rollover. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. A rollover avoidance system for changing the damping characteristics of suspension dampers at each wheel of a vehicle to mitigate a potential rollover condition, said system comprising:
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a plurality of vehicle parameter sensors for measuring vehicle parameters and providing vehicle parameter signals; and a controller for generating a damper suspension command signal for each damper, said controller being responsive to the vehicle parameter signals, said controller calculating a yaw stability control factor based on a yaw rate error signal and a side-slip error signal, said controller also calculating a closed-loop roll control factor and an open-loop roll control factor that are added to provide a total rollover control factor, wherein the controller uses the larger of the total roll control factor or the yaw stability control factor to determine the damper suspension command signals. - View Dependent Claims (18, 19, 20)
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Specification