Method for estimating a friction coefficient of a roadway by a transportation vehicle, control device, and transportation vehicle
AssigneeVolkswagen Aktiengesellschaft
InventorFrank Bärecke
Life of this patent
Estimating the term…
Abstract
A method for estimating a friction coefficient of a roadway by a transportation vehicle, wherein a control device of the transportation vehicle receives a first estimated value of a maximum horizontal force from a traction control system that is transmitted to the roadway by a wheel of the transportation vehicle. A control device receives a second estimated value of a wheel contact-patch force of the wheel from a damper controller and calculates the friction coefficient as a vehicle-independent friction coefficient based on the estimated values from the wheel contact-patch force and the horizontal force.
Claims18
A method for estimating a coefficient of friction of a roadway by a transportation vehicle, the method comprising:
- receiving, by a control device of the transportation vehicle, a first estimate of a maximum horizontal force transmitted by a wheel of the transportation vehicle to the roadway from a slip control system of the transportation vehicle;
- receiving, by the control device, a second estimate of a wheel contact force of the wheel from a damping control of the transportation vehicle, the damping control including a suspension strut of the wheel, a damper having a spring, and a roll-stabilizer of the vehicle, wherein the second estimate of the wheel contact force is determined based on at least one of a spring tension force of the spring of the damper acting on the wheel in response to the transportation vehicle transmitting a force to the wheel, a damping force based on a damper rigidity of the damper in response to the transportation vehicle transmitting the force to the wheel, and a roll-stabilizer force transmitted to the wheel via the roll-stabilizer;
- and
- calculating a vehicle-independent coefficient of friction, by the control device, based on the estimates of the wheel contact force and the horizontal force.
A control device for a transportation vehicle, the control device comprising a processor implemented control device that estimates a coefficient of friction of a roadway by a transportation vehicle, wherein the control device of the transportation vehicle:
- receives a first estimate of a maximum horizontal force which is transmitted by a wheel of the transportation vehicle to the roadway from a slip control system;
- receives a second estimate of a wheel contact force of the wheel from a damping control of the transportation vehicle, the damping control including a suspension strut of the wheel, a damper having a spring, and a roll-stabilizer of the vehicle, wherein the second estimate of the wheel contact force is determined based on at least one of a spring tension force of the spring of the damper acting on the wheel in response to the transportation vehicle transmitting a force to the wheel, a damping force based on a damper rigidity of the damper in response to the transportation vehicle transmitting the force to the wheel, and a roll-stabilizer force transmitted to the wheel via the roll-stabilizer;
- and
- calculates a vehicle-independent coefficient of friction based on the estimates from the wheel contact force and the horizontal force.
Dependencies are inferred from the claim text.