Tire load prediction system, tire load prediction program, and tire load prediction method

A tire load prediction program executed by a CPU provided in a tire load prediction system, the program comprising:

• a strain data acquisition step of acquiring strain data in a tire tangential direction that is output from a strain sensor provided on an inner side surface of a tire or inside the tire;
• a linear transformation step of performing a linear transformation on the acquired strain data;
• a first estimation step of estimating a velocity and angular velocity in the tire tangential direction on the basis of a transformation result;
• a second estimation step of estimating a velocity in a tire radial direction on the basis of estimated values for the velocity and angular velocity in the tire tangential direction;
• a third estimation step of estimating a velocity in a θ-angle direction corresponding to an angle of the strain sensor with respect to a ground contact surface of the tire, on the basis of estimated values for an acceleration and angular velocity in the tire tangential direction;
• a fourth estimation step of estimating deflection of the tire on the basis of the velocity and angular velocity in the tire tangential direction, the velocity in the tire radial direction, and the velocity in the θ-angle direction;
• and
• a load prediction step of predicting a load applied to the tire on the basis of the estimated deflection of the tire.

A tire load prediction method comprising:

• a strain data acquisition process of acquiring strain data in a tire tangential direction that is output from a strain sensor provided on an inner side surface of a tire or inside the tire;
• a linear transformation process of performing a linear transformation on the acquired strain data;
• a first estimation process of estimating a velocity and angular velocity in the tire tangential direction on the basis of a transformation result;
• a second estimation process of estimating a velocity in a tire radial direction on the basis of estimated values for the velocity and angular velocity in the tire tangential direction;
• a third estimation process of estimating a velocity in a θ-angle direction corresponding to an angle of the strain sensor with respect to a ground contact surface of the tire, on the basis of estimated values for an acceleration and angular velocity in the tire tangential direction;
• a fourth estimation process of estimating deflection of the tire on the basis of the velocity and angular velocity in the tire tangential direction, the velocity in the tire radial direction, and the velocity in the θ-angle direction;
• and
• a load prediction process of predicting a load applied to the tire on the basis of the estimated deflection of the tire.