Adaptive suspension control for a motor vehicle
AssigneeGM Global Technology Operations LLC
InventorsYoussef Ghoneim, Veit Held
Life of this patent
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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.
Claims13
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.
A system for controlling a suspension of a motor vehicle, comprising:
- 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.
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.
A computer readable medium embodying a program product, said program product comprising:
- 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.
Dependencies are inferred from the claim text.