Patent ID: 9645037
Date: 2017-05-09
CPC Classifications: G01M

Claim:
1. A vehicle wheel service system having a spindle shaft for rotation about an axis and adapted for receiving a vehicle wheel assembly consisting of a tire mounted to a wheel rim, a motor operatively connected to the spindle shaft for rotating the spindle shaft and wheel assembly, and a processor operatively configured to control the components of the vehicle wheel service system, comprising: a load roller assembly supporting a load roller for rotation about a rotational axis, whereby said processor is configured to control engagement of said load roller assembly and said wheel assembly to apply a generally radial force to said vehicle wheel assembly during rotation; at least one sensor for measuring a lateral force exerted by said vehicle wheel assembly on said load roller during rotation while said generally radial force is applied to said vehicle wheel assembly without regards as to a specific orientation between the load roller rotational axis and the vehicle wheel assembly axis of rotation; and wherein the processor is operatively configured to determine quantified representations of conicity and ply steer for the tire under loaded conditions from measures of lateral force received from said at least one sensor together with a load roller correction factor, said load roller correction factor based on a position of said load roller during application of said generally radial force to said vehicle wheel assembly.