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US 8,948,959 B2Granted
Method of determining the stress that should be applied to a tyre during an indoor endurance bench test
AssigneeBridgestone Corporation
InventorMarco Andrea Maggi
Life of this patent
Estimating the term…
Abstract
A method of determining the stress that should be applied to a tire during an indoor endurance bench test. The method includes the steps of driving a vehicle along a sample road route; measuring variations in the longitudinal speed and position of the vehicle during its journey along the sample road route; and calculating the inertial forces acting on the vehicle during its journey along the sample road route, on the basis of variations in the longitudinal speed and position of the vehicle.
Claims19
A method of determining the stress that should be applied to a tire during an indoor endurance bench test, the method comprising the steps of:
- driving a vehicle (1) along a sample road route;
- measuring variations in the longitudinal speed (Vx) and position (P) of the vehicle (1) as it travels along the sample road route;
- and
- calculating via an electronic control unit the inertial forces (FIx, FIy) acting on the vehicle (1) as it travels along the sample road route, on the basis of variations in the longitudinal speed (Vx) and position (P) of the vehicle (1);
- determining the maximum permitted speed (Vx-max) along at least one section of the sample road route;
- comparing the measured longitudinal speed (Vx) with the maximum permitted speed (Vx-max);
- and
- calculating the inertial forces (FIx, FIy) acting on the vehicle (1) using a longitudinal speed (Vx) other than the measured longitudinal speed (Vx) when the measured longitudinal speed (Vx) differs significantly from the maximum permitted speed (Vx-max);
- considering the measured longitudinal speed (Vx) as point-to-point when differing significantly from the maximum permitted speed (Vx-max) when the absolute difference between the measured longitudinal speed (Vx) and the maximum permitted speed (Vx-max) is above a predetermined first threshold value;
- and
- comprising the further step of point-to-point correction of the measured longitudinal speed (Vx) when necessary.
8 more elements
A method of determining the stress that should be applied to a tire during an indoor endurance bench test, the method comprising the steps of:
- driving a vehicle along a sample road route;
- measuring variations in the longitudinal speed and position of the vehicle as it travels along the sample road route;
- and
- calculating via an electronic control unit the inertial forces acting on the vehicle as it travels along the sample road route, on the basis of variations in the longitudinal speed and position of the vehicle;
- determining the maximum permitted speed along at least one section of the sample road route;
- comparing the measured longitudinal speed with the maximum permitted speed;
- and
- calculating the inertial forces acting on the vehicle using a longitudinal speed other than the measured longitudinal speed when the measured longitudinal speed differs significantly from the maximum permitted speed;
- acquiring images of the road ahead of the vehicle as it travels along the sample road route;
- recognizing Highway Code speed limit signs in the images of the road ahead of the vehicle;
- and
- determining the maximum permitted speed of each section of the sample road route on the basis of the Highway Code speed limit signs;
- wherein, in the event of conflict, speed limit signs have priority over the speed limit information in the road map.
10 more elements
A method of determining the stress that should be applied to a tire during an indoor endurance bench test, the method comprising the steps of:
- driving a vehicle along a sample road route;
- measuring variations in the longitudinal speed and position of the vehicle as it travels along the sample road route;
- and
- calculating via an electronic control unit the inertial forces acting on the vehicle as it travels along the sample road route, on the basis of variations in the longitudinal speed and position of the vehicle;
- determining the maximum permitted speed along at least one section of the sample road route;
- comparing the measured longitudinal speed with the maximum permitted speed;
- and
- calculating the inertial forces acting on the vehicle using a longitudinal speed other than the measured longitudinal speed when the measured longitudinal speed differs significantly from the maximum permitted speed;
- determining the longitudinal acceleration of the vehicle by calculating the rate of change in the longitudinal speed of the vehicle;
- determining a trajectory of the vehicle on the basis of variations in the position of the vehicle;
- determining a radius of curvature of the trajectory of the vehicle;
- calculating the lateral acceleration of the vehicle on the basis of longitudinal speed and the radius of curvature of the trajectory;
- calculating a longitudinal inertial force acting on the vehicle by multiplying the mass of the vehicle by the longitudinal acceleration of the vehicle;
- and
- calculating a lateral inertial force acting on the vehicle by multiplying the mass of the vehicle by the longitudinal acceleration of the vehicle.
12 more elements
Dependencies are inferred from the claim text.