Inversion-based feedforward actions in a ratio control system

In this paper we propose a new ratio control architecture that exploits the use of inversion-based feedforward actions to achieve a fast set-point step response while keeping the required ratio between two process variables. The recently developed ratio tracking station is then achieved to increase the robustness of the system. A user design parameter allows the selection of the trade-off between the settling time of the step response and the performance in keeping the desired ratio. Simulation results demonstrate the effectiveness of the method.