This paper presents the results of an engine air-path H-infinity state feedback switched linear controller. The main advantage of this approach is that controller gains are calculated offline, with the robust specifications allowing fast calculation and is cost-effective in calculation and resources. The air-path system dynamics are governed by the Saint-Venant equations, difficult to handle in control synthesis due to its nonlinear properties (states - control inputs coupling, nonlinear functions). To employ advanced control techniques, a switched linear state space representation is proposed. The model is simplified considering that slow dynamics are quite constant. The proposed approach provides a robust state feedback control toward perturbations (model error, unmodeled dynamics...) by considering these disturbances as unknown inputs.