Suspension control system and method thereof
AssigneeHyundai Motor Company
InventorsJae Sung Cho, Young Sik Yoon
Life of this patent
Estimating the term…
Abstract
A suspension control system and a method thereof are provided. Steering characteristics (e.g., under-steering and over-steering) of a running vehicle are analyzed to calculate lateral force of wheels and normal load (or normal force) of the wheels is calculated based on the lateral force. In addition, a current that corresponds to a total current value obtained by adding a yaw control current value corresponding to the normal force and a roll control current value is applied to a damper of the corresponding vehicles to perform roll control and yaw control of the vehicle.
Claims22
A suspension control system comprising:
- a memory configured to store program instructions;
- and
- a processor configured to execute the program instructions, the program instructions when executed configured to:
- store a distance from a vehicle center of mass to front wheels, a distance from the vehicle center of mass to rear wheels, a vehicle mass m, a wheel base L, and a tire lateral force deflection sensitivity coefficient K based on a change in a load;
- store a yaw control current value based on a normal force and a damper velocity;
- collect a steering angle, a vehicle speed u, a yaw rate γ, and lateral acceleration ;
- determine steering characteristics of the vehicle;
- calculate lateral force of all the front and rear wheels based on the steering characteristics;
- calculate normal force of all the front and rear wheels based on the lateral force;
- detect a yaw control current value that corresponds to the normal force and a current damper velocity;
- detect a roll control current value based on a damper characteristic curve;
- and
- apply a current that corresponds to the sum of the yaw control current value and the roll control current value to a corresponding damper.
A suspension control method comprising:
- determining, by a processor, steering characteristics of a vehicle;
- in response to determining that the vehicle is in an under-steering steering characteristic, calculating, by the processor, lateral force of front wheels, calculating, normal force of the front wheels based on the lateral force, and detecting a yaw control current value that corresponds to the normal force and a current damper velocity;
- in response to determining that the vehicle is in an over-steering steering characteristic, calculating, by the processor, lateral force of rear wheels, calculating normal force of the rear wheels based on the lateral force, and detecting a yaw control current value that corresponds to the normal force and a current damper velocity;
- detecting, by the processor, a roll control current value based on a damper characteristic curve;
- and
- applying, by the processor, a current that corresponds to the sum of the yaw control current value and the roll control current value to a corresponding damper.
A non-transitory computer readable medium containing program instructions executed by a processor, the computer readable medium comprising:
- program instructions that store a distance from a vehicle center of mass to front wheels, a distance from the vehicle center of mass to rear wheels, a vehicle mass m, a wheel base L, and a tire lateral force deflection sensitivity coefficient K based on a change in a load;
- program instructions that store a yaw control current value based on a normal force and a damper velocity;
- program instructions that collect a steering angle, a vehicle speed u, a yaw rate γ, and lateral acceleration ;
- program instructions that determine steering characteristics of the vehicle;
- program instructions that calculate lateral force of all the front and rear wheels based on the steering characteristics;
- program instructions that calculate normal force of all the front and rear wheels based on the lateral force;
- program instructions that detect a yaw control current value that corresponds to the normal force and a current damper velocity;
- program instructions that detect a roll control current value based on a damper characteristic curve;
- and
- program instructions that apply a current that corresponds to the sum of the yaw control current value and the roll control current value to a corresponding damper.
Dependencies are inferred from the claim text.