Patent ID: 6622101
Filing Date: 2003-09-16
Classification: G07C,Y02P

Abstract:
Method for monitoring a quality of a plurality of particularly different technical product types (P,Pâ€²,Pâ€³,Pâ€²â€³) which are produced in a quasi-parallel manufacturing process, said manufacturing process comprising several sequentially arranged manufacturing stations (S1,S2,S3), and a course of a state variable (T2) for at least one (S1) of said manufacturing stations being determined point-by-point and displayed (20), wherein(a) a number of product types to be monitored is determined as a first type number (j); (b) a technical product parameter (d1,d2,b1) which is affected in said at least one manufacturing station (S1), is determined, and a measuring arrangement (10,11,12) is allocated to said manufacturing station for measuring said technical product parameter for at least one of said monitored product types (S1); in said manufacturing process(c) a random sample of a (first) product type, modified in its physical state in said manufacturing station (S1), is taken from said first type number of product types, and (first) measured values are determined for said determined technical product parameter of said random sample; (d) an individual average value ({overscore (m)}p) is calculated from said measured values and said average value ({overscore (m)}p) is stored in a multi-dimensional average value ({overscore (m)}) attributed to said first type number; (e) said steps (c) and (d) are repeated for at least one further product type (Pâ€²) to supplement at least one further measured average value ({overscore (m)}p+1) to said multi-dimensional average value ({overscore (m)}); (f) (only) after the expiry of a defined time interval (T1), said stored multi-dimensional average value, comprising several individual average values, is converted (15) together to a state variable and one of stored and graphically represented (20) as a point (Ta,Tb,Tc) of the course of said state variable (T2(t)).