Adaptive suspension control for a motor vehicle
First Claim
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1. A system for controlling a suspension of a motor vehicle, comprising:
- a chassis;
a wheel;
a suspension system coupling the wheel and the chassis;
a lateral acceleration sensor, adapted to distinguish between a high lateral acceleration state of motion and a low lateral acceleration state of motion; and
a suspension control system coupled to the suspension system and adapted to control a variable stiffness of the suspension system, the suspension control system comprising a controller coupled to the lateral acceleration sensor and adapted to autonomously modify the variable stiffness of the suspension system to set a higher stiffness of the suspension system in the high lateral acceleration state of motion as compared to the low lateral acceleration state of motion responsive to the lateral acceleration sensor.
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Abstract
A suspension control system for a motor vehicle having a chassis and wheels connected to the chassis by a suspension system the stiffness of which is variable under the control of the suspension control system comprises a controller adapted to modify autonomously the stiffness of the suspension system depending on a current state of motion of the vehicle.
47 Citations
13 Claims
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1. A system for controlling a suspension of a motor vehicle, comprising:
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a chassis; a wheel; a suspension system coupling the wheel and the chassis; a lateral acceleration sensor, adapted to distinguish between a high lateral acceleration state of motion and a low lateral acceleration state of motion; and a suspension control system coupled to the suspension system and adapted to control a variable stiffness of the suspension system, the suspension control system comprising a controller coupled to the lateral acceleration sensor and adapted to autonomously modify the variable stiffness of the suspension system to set a higher stiffness of the suspension system in the high lateral acceleration state of motion as compared to the low lateral acceleration state of motion responsive to the lateral acceleration sensor. - View Dependent Claims (2, 5, 6, 7, 8, 9, 10, 11)
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3. A system for controlling a suspension of a motor vehicle, comprising:
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a chassis; a wheel; a suspension system coupling the wheel and the chassis; and a suspension control system adapted to control a variable stiffness of the suspension system, the suspension control system comprising a controller adapted to autonomously modify the variable stiffness of the suspension system depending on a current state of motion of the motor vehicle; wherein the controller is also adapted to estimate a side-slip rate of the motor vehicle to distinguish between a high side-slip rate state of motion and a low side-slip rate state of motion and further adapted to set a higher stiffness of the suspension system in the high side-slip rate state as compared to the low side-slip rate state. - View Dependent Claims (4)
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12. A method for controlling a stiffness of a suspension system in a motor vehicle, comprising the steps of
measuring a lateral acceleration of the motor vehicle; -
measuring a yaw rate of the motor vehicle; determining a current state of motion of the motor vehicle by estimating a side-slip rate from the lateral acceleration rate and yaw rate; and autonomously setting the stiffness of the suspension system to a value associated to the current state of motion when a change from a prior state of motion is determined.
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13. A computer readable medium embodying a program product, said program product comprising:
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a stiffness control program for controlling a stiffness of a suspension in a motor vehicle, the stiffness control program configured to; determine a current state of motion of the motor vehicle by distinguishing between a high yaw rate state of motion and a low yaw rate state of motion; and autonomously set the stiffness of a suspension system to a higher stiffness value associated to the current state of motion when a change from a prior low yaw rate state of motion to a high yaw rate state of motion is determined.
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Specification