Regelung periodischer Prozesse (English shop)

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This work presents a method for the steady-state accurate control of periodic, highly dynamic processes, which was designed and successfully applied in two industrial applications. The method was given the name ZykloRegler.

Before the ZykloRegler was put into use, it was first analysed in terms of system theory. It was demonstrated that it achieves steady-state accuracy for periodic reference and disturbance variables. The marginally stable poles required for this in the open control loop necessitate targeted, frequency-selective phase shifts of the control error in order to stabilise the closed control loop. It was shown that the ZykloRegler is capable of transforming the marginally stable poles of the open control loop into stable poles of the closed control loop. To this end, a design rule was derived for those controller parameters that influence the corresponding poles.

After the method had been theoretically validated with regard to stability and steady-state accuracy, the first technical application was implemented.

The ZykloRegler was used for the electrohydraulic control of periodic, highly dynamic force profiles on a journal bearing test rig. For this purpose, a control unit was developed that meets the requirements placed on digital signal processing by the control algorithm and also provides the analogue signal processing required by the sensors and actuators of the electrohydraulic system.

The ZykloRegler was commissioned on the journal bearing test rig and tested extensively. In doing so, the required properties with regard to stability and steady-state accuracy were demonstrated, including for highly dynamic reference variables. The required force profiles could be controlled precisely.

In a second application, the ZykloRegler was used to control the mean crankshaft speed of a direct-injection diesel engine in a test vehicle.

The control system was implemented in the test vehicle using a rapid prototyping system and tested extensively. Since the ZykloRegler achieves steady-state accuracy for periodic reference and disturbance variables, it combines the functions of idle speed control and smooth running control. When the ZykloRegler is used as an idle speed controller, no additional method for smooth running control is required.

The high control quality of the ZykloRegler was demonstrated in two different technical applications. In both applications, modelling would have been very laborious. The ZykloRegler requires no modelling for parameterisation. It could be adapted to the respective controlled system with little effort, largely empirically.

A patent ⁶ was granted for the control method by the German Patent and Trade Mark Office.