Charge Air and Fuel Gas Pressure Control on a HiL-System for the Development of Transient Large Bore Gas Engines

This paper presents an approach for developing transient strategies for multi-cylinder gas engines using only a single cylinder in a hardware-in-the-loop setup. Engine components that are physically not present are replaced by a real-time model. The model generates pressure and speed trajectories, which are applied to the single-cylinder engine to ensure that its behavior is identical to its operation as part of the multicylinder engine. Design and analysis of two of the controllers used for that purpose are discussed. For the control of the charge air pressure, a concept based on nonlinear decoupling and a strategy maximizing the actuator range available for disturbance rejection is presented. To control the fuel gas pressure, a linear plant model is obtained and a controller motivated by stability conditions is proposed.