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Turbocharged gasoline engines are becoming more common in production vehicles as consumers demand improved fuel economy with uncompromised performance. Controlling this complex system to meet these and other competing objectives is a challenging task. Knowledge of exhaust manifold pressure and turbocharger speed can be important to success. Physical conditions of the system, however, make measurement...
In this paper, the pressure difference between the anode and cathode compartments of a polymer electrolyte membrane (PEM) fuel cell stack is regulated along with the anode and cathode humidities using an anode recirculation system. The pressure regulation requirement stems from membrane safety considerations. The regulation of average humidities in the two compartments is a necessary (although not...
Water management through anode water removal and cathode air inlet humidification is investigated in this paper. A state feedback controller is designed to meet both the steady state and transient requirements for water balance and pressure regulation. Performance of the controlled system with full- state feedback is analyzed, in particular when water content in the stack is measured by humidity sensors...
An ejector based recirculation system is incorporated on the anode side of the fuel cell to address anode flooding. The objective of the recirculation system is to regulate anode humidity with recirculating flow, while safeguarding the membrane and supporting the electric load. These objectives can be achieved by a control system that uses two actuators, namely the fuel supplied from the fuel source...
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