Patent ID: 6092415
Filing Date: 2000-07-25
Classification: B60C

Abstract:
Method for monitoring tire air pressure of wheels of an automobile having driven and non-driven wheels, each of said wheels including an inflatable tire, said method, comprising the steps of:for at least one driven wheel of the automobile, recording measured data pairs comprising values for slip and for an associated longitudinal force of tires, while operating the automobile;determining a characteristic curve for the recorded longitudinal force of tires-slip measured data pairs;determining a zero intercept offset value of the characteristic curve, which offset value is equal to a slip value indicated by the characteristic curve corresponding to a zero longitudinal force of the tires value;determining a wheel radius relationship between at least one non-driven wheel and the at least one driven wheel based on the offset value;determining relative tire pressure between said at least one non-driven wheel and said at least one driven wheel based on said wheel radius relationship;directly measuring absolute tire air pressure on at least one wheel; andusing the absolute tire air pressure as a reference pressure value to determine tire air pressure of at least one other wheel.