Patent ID: 7403846
Filing Date: 2008-07-22
Classification: A01D,A01F

Abstract:
1. A method of activating an optimal sieve control action, the method comprising: registration of a deviance from a threshold value for crop material load on the upper sieve of a grain cleaning system, wherein the sieve control action comprises a open-close sieve control action which is determined by the parameter t wherein u(k) represents the flow of crop material that is transported to the front end of the pre-sieve in a grain cleaning system, y(k) represents the flow of material that leaves the back side of the upper sieve, and x(k) represents the return flow fraction of crop material, wherein calculates the total amount of sieve losses that are simulated in the [τ 0 , T sim ] interval wherein introduces a soft constraint on the instantaneous return flow x(k)<x c to avoid overload in the return flow system, and wherein time interval ρ(t 1 -t 0 ) penalizes long activation intervals of the special settings.