Wear amount detection device for automobile tires

A wear amount detection device for a tire of an automobile, the wear amount detection device detecting a wear amount of the tire, the wear amount detection device comprising:

• a rotation sensor configured to detect a rotation signal of a wheel so as to measure a speed of the automobile;
• a signal processing unit configured to:
• extract rotation speed fluctuations synchronized with the rotation, from the rotation signal detected by the rotation sensor;
• and obtain, from the extracted rotation speed fluctuations, rotation speed fluctuation patterns over a plurality of rotations, each of the rotation speed fluctuation patterns including a rotation speed fluctuation synchronized with the corresponding rotation;
• and
• a wear state determination unit configured to:
• determine, in the obtained rotation speed fluctuation patterns, a component value induced by a characteristic embodied in the tire, the component value varying in accordance with a wear state of the tire;
• estimate a wear state of the tire on the basis of the determined component value;
• and output wear information.