Method for controlling the quality of a tyre production and plant for producing tyres

A method for controlling quality of production of tyres comprising:

• detecting a parameter relative to one or more tyres being processed by at least one detection system, wherein the parameter is chosen from starting components, steps for obtaining semifinished products, semifinished products, steps for building a green tyre, green tyres, vulcanisation, moulded and vulcanized tyres;
• comparing a succession of values of said parameter by comparing each value with at least one discard threshold wherein said at least one discard threshold divides a discard interval from an acceptable interval by at least one control unit;
• controlling a trend of said succession of values with respect to the discard threshold, wherein controlling the trend of said succession of values comprises calculating a first derivative of a function representative of values of the parameter and analysing a sign of the first derivative;
• and
• feedbacking a result of the trend control at least when said succession of values tends toward the discard threshold in order to operate on at least one system for managing a plant for producing tyres, in a manner so as to reverse the trend of the succession of values in the course of one or more further controls, wherein feedbacking the result of the trend control comprises sending a feedback signal to one or more chosen from:
• a system for managing starting components;
• a system for managing obtainment of semifinished products starting from one or more starting components;
• a system for managing building of a green tyre starting from one or more semifinished products;
• and a system for managing vulcanisation of the green tyre, of said plant for producing tyres,
• and wherein, when the first derivative of the function representative of the values of the parameter is positive with the discard threshold greater than the detected values or when the first derivative of the function representative of the values of the parameter is negative with the discard threshold less than the detected values, said feedback signal is adapted to affect a respective system for managing in order to modify said parameter in a manner such that the first derivative of the function representative of the values of the parameter is zero or negative, if the discard threshold is greater than the detected values, or such that the first derivative of the function representative of the values of the parameter is zero or positive, if the discard threshold is less than the detected values.

A plant for producing tyres comprising:

• a system for managing starting components;
• a system for managing obtainment of semifinished products starting from one or more starting components;
• a system for managing building of a green tyre starting from one or more semifinished products;
• a system for managing vulcanisation of said green tyre;
• and
• a system for controlling a parameter relative to quality of a tyre being processed comprising:
• at least detection system for detecting a parameter relative to one or more tyres being processed wherein said parameter is associated with one or more from among:
• starting components, steps for obtaining semifinished products, semifinished products, steps for building a green tyre, green tyres, vulcanisation, moulded and vulcanised tyres;
• and
• at least one control unit programmed for:
• comparing a succession of values of said parameter by comparing each value with at least one discard threshold, wherein said at least one discard threshold divides a discard interval from an acceptable interval;
• controlling a trend of said succession of values with respect to the discard threshold;
• and
• feedbacking a result of the trend control at least when said succession of values tends toward the discard threshold in order to operate on at least one of said systems for managing, in a manner so as to reverse the trend of the succession of values in a course of one or more further controls,
• and wherein said control unit is programmed for feedbacking a result of the trend control by sending a feedback signal to one or more from among:
• the system for managing starting components;
• the system for managing the obtainment of semifinished products starting from one or more starting components;
• the system for managing the building of a green tyre starting from one or more semifinished products;
• and the system for managing the vulcanisation of the green tyre.