US 4,783,992 A · Method of detecting configuration of tire

Abstract

In a method of detecting an outer configuration of a side wall surface of an inflated tire, a distance between a sensor and the side wall surface is detected in a non-contact manner to derive a displacement signal, the displacement signal is converted into a digital displacement signal and successive peaks of the digital displacement signal are detected. Heights h.sub.n and distances l.sub.n between successive peak points are derived and areas AS.sub.n and BS.sub.n surrounded by the displacement signal and a rectangle whose corners are coincident with adjacent peak points are derived. The heights h.sub.n, distances l.sub.n are areas AS.sub.n, BS.sub.n are compared with threshold values h.sub.R, l.sub.R and AS.sub.R, BS.sub.R, respectively. When h.sub.n >h.sub.R, l.sub.n <l.sub.R and AS.sub.n >AS.sub.R or BS.sub.n >BS.sub.R, a relevant tire is judged to be inferior.

Claims7

Dependent claims

A method of detecting an outer configuration of a surface of an inflated tire comprising the steps of:

rotating the inflated tire through a sensor which can measure a distance between the sensor and the surface of tire in a non-contact manner to derive an analog displacement signal;
converting the analog displacement signal into a digital displacement signal;
storing the digital displacement signal in relation to a rotational position of the tire;
deriving peak points of the digital displacement signal;
detecting an outer configuration of a surface of tire in accordance with the detected peak points by deriving heights h.sub.n between successive peak points;
deriving distance l.sub.n between successive peak points;
deriving first and second areas AS.sub.n and BS.sub.n surrounded by the displacement signal and a rectangle whose opposite corners are coincided with successive peak points;
and
comparing said heights h.sub.n, distances l.sub.n and areas AS.sub.n and BS.sub.n with threshold values h.sub.R, l.sub.R and AS.sub.R and BS.sub.R, respectively.

6 more elements

Dependencies are inferred from the claim text.

Method of detecting configuration of tire

Life of this patent

Method of detecting configuration of tire

Life of this patent

Abstract

Claims7