Transient Performance Simulation and Analysis of Turbocharged Diesel Engines

Abstract

<div class="htmlview paragraph">An advanced analytical model is presented and used for a fundamental investigation of the response of highly rated turbocharged diesel engines. Details of many aspects of the model are presented, along with a discussion of certain limitations and their importance. The accuracy of the model is illustrated.</div> <div class="htmlview paragraph">Factors influencing turbocharger response are discussed and the dominant ones selected for further analysis. The fuel control system of a highly rated engine usually consists of a device that limits maximum fuel delivery as a function of boost pressure. Changes in turbocharger match can be used to improve low-speed torque and reduce exhaust smoke. The importance of then re-optimizing the maximum fuel controller for transient as well as steady state conditions is illustrated, showing the trade-off between improved drive ability and exhaust smoke.</div> <div class="htmlview paragraph">Turbocharger inertia also strongly influences response and can be reduced by design, material and diameter changes. However reducing turbine diameter alone causes an efficiency miss-match {with radial turbo machinery). The implications of the trade-off between specific speed, efficiency, diameter, inertia, matching and response are presented.</div>