Application of H∞ optimal design to automotive fuel control

This study seeks to apply H_∞ robust control theory to the design of an automotive diesel pump control system, and also to compare the results with those when optimal regulator theory is applied. A diesel pump control system must respond quickly and undeviatingly whenever a driver pedals the accelerator. Fuel viscosity changes due to temperature variations exert a great influence on the control system, both statically and dynamically. First, we constructed a feedback system by applying optimal regulator theory to the diesel pump control. However, the control has to be achieved by switching several feedback gains in relation to the fuel temperature variations. Thus, the aim of the present study was directed to design a robust control system that can withstand parameters perturbation. To do this, we used a type one robust feedback system constructed by application of H_∞ robust control theory.