A METHOD OF, A CONTROL SYSTEM, A DEVICE, A SENSOR AND A COMPUTER PROGRAM PRODUCT FOR CONTROLLING TRANSPORT OF FIBROUS MATERIAL IN A TRANSPORT LINE OF A PNEUMATIC CONVEYING SYSTEM

摘要

A method of and control system for controlling transport of fibrous material travelling in dune (3, 4) or dune and layer (5) flow mode conveyed by a pneumatic fluid flow through a transport line (1) of a pneumatic conveying system, such as a cut tobacco conveying system in a device for feeding cut tobacco to a tobacco processing device. The transport velocity (Vd; Vl) of a dune (3, 4) or layer (5) and the velocity (Vp) of pneumatic fluid passing the dune(3, 4) or layer (5) in the transport line (1) are determined. A difference (&Dgr;Vpd; &Dgr;Vpl) between the determined dune or layer transport velocity (Vd; Vl) and the determined passing fluid velocity (Vp) is controlled by controlling the pneumatic fluid flow in the transport line (1). An optical sensor and a computer program product for use with the method and system are provided.