Two Problems in Tire Shear Force Evaluation:The Influence of Wheel Deceleration Rate of Braking Force and A Methodology for Obtaining Tire Side Force Numerics.

摘要

The report deals with the influence of wheel deceleration rate on the braking force produced by pneumatic tires,and numerics for evaluating the lateral force performance of pneumatic tires. It is found that the maximum braking force obtained from passenger car tires operated on wet surfaces can be significantly affected by wheel deceleration rate. Three numerics have been chosen to provide a safety-relevant condensation of tire lateral force data. These numerics are cornering stiffness at rated load and inflation pressure,maximum lateral force at 40mph on representative wet surfaces and the rate of change of maximum lateral force evaluated at 40mph on the same wet surfaces.