Method for estimating a value of a friction force exerted on a part of a power steering system by means of a mathematical model
AssigneeJtekt Europe
InventorsSerge Gaudin, Nicolas Baudouin, Pascal Moulaire
Life of this patent
Estimating the term…
Abstract
A method for estimating a value of a friction force exerted on a part of a power steering system of a vehicle, the part of the power steering system including at least one motor exerting a motor torque, the value of the friction force making it possible to modify the motor torque, by means of a mathematical model.
Claims6
A method of estimating a value of a frictional force exerted on a portion of a power steering system of a vehicle, said portion of the power steering system comprising at least one motor exerting a motor torque, said value of the frictional force making it possible to modify the motor torque, wherein it comprises the following steps:
- determining a portion of a model power steering system corresponding to a mathematical model virtually representing the portion of the power steering system, wherein the mathematical model comprises a frictional force model,
- measuring, on the portion of the power steering system, a value of at least one input variable,
- calculating at least one output parameter by means of the mathematical model and the at least one input variable,
- measuring, on the portion of the power steering system, a value of at least one output variable representing a physical quantity similar to the at least one output parameter,
- calculating at least one deviation between the at least one output parameter and the at least one output variable,
- correcting a value of at least one internal parameter of said mathematical model as a function of the deviation and of an internal coefficient,
- determining the value of the frictional force from the at least one corrected internal parameter.
Dependencies are inferred from the claim text.