Agricultural harvesting vehicle and method for controlling grain loss from a sieve in the cleaning section of a harvesting vehicle

摘要

The present invention relates in particular to an agricultural harvesting vehicle as a combined harvester for gathering crops from a group and processing crops to separate grain seeds from waste material such as stems and leaves. The harvesting vehicle of the invention is provided with a cleaning section comprising a blower and at least one sieve, usually a set of upper and lower sieves. the sieves are configured to carry a layer comprising a mixture of grain seeds and waste material towards an exit edge of the sieve such that the seeds fall through the sieve openings and the residues remain in the sieve until they are ejected from the sieve. sieve crossing the exit edge. The sieve may be subject to grain loss, consisting of a loss of grain outside the sieve and loss of blown grain, and such losses are due, respectively, to the fact that the grain seeds are ejected together with the waste. through the outlet edge or being suspended in the air being blown out of the cleaning section by the blower. In a harvester according to the invention, the cleaning section is further equipped with detection means configured to determine whether the loss of blown grain or the loss of grain outside the screen is the major contributor to total grain loss. The sensing means may additionally be equipped with a grain loss detector configured to measure off-screen grain loss detector and at least a portion of blown grain loss. In particular, the invention relates to embodiments in which the sensing means are configured to measure a differential pressure obtained by a suitable pressure sensing configuration or a measure of blown grain loss relative to total grain loss or loss. grain outside the sieve by an impact sensor mounted above the sieve