Omron Tateisi Electronics Co.

Trutzschler Gmbh & Co Kg

Ulrich Hoffmann

Heinrich Rake

Ulrich Muller

Wolfgang Wiening

Rudolf Breddermann

Rainer Blumbach

A method of evening a sliver produced by a carding machine in which a predetermined output rate and draft are set. The method includes the steps of determining the actual weight of a predetermined sliver length by weighing; determining the difference between the actual sliver weight and a desired sliver weight; as a function of the difference altering the draft corresponding to a predetermined sliver thickness; measuring momentary actual thicknesses of the running sliver at a card output for a determined time period or sliver length and generating mechanical signals representing the momentary actual sliver thicknesses; converting the mechanical signals to first electric signals; combining the first electric signals into a second electric signal constituting an average of the first electric signals and representing the actual sliver thickness of the measured sliver; storing the second electric signal; applying the second electric signal to a computer; applying to the computer a third electric signal representing the actual sliver weight; and determining, with the computer and from a function between the actual sliver weight and the actual sliver thickness, a desired sliver thickness corresponding to a desired sliver weight.

Method and apparatus for evening the sliver produced by a card

The present invention relates to an arrangement for the discrete-time adaptive on-off switching control of a continuous-time process with a binary switching actuator, which uses for the determination of the on-off actuating signal a prediction of a process output sequence over several future sampling intervals as reaction to a possible process input sequence that is applied to a discrete-time linear process model and which estimates and updates in every sampling interval the parameters of the process model by means of a parameter estimation device in order to adapt them to the process to be controlled, even when the process behavior changes, and which has a device for the input and change of the setpoint, the limits of the process output and the sampling time as well as a measuring device for the periodical measurement of the process input. The arrangement further comprises two alternatively working control devices one of which is active in the stationary phase and the other of which is active in the start-up phase of the process or after setpoint changes, and a switching device which activates one or the other said control device in dependence of the result of the measurement of the process output and of input current setpoint, wherein the actuator is served by the active control device.

Time-discrete adaptive switching on-off controller

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Aachen, Germany

Ulrich Hoffmann