Rezk, Ahmed, Carter, Jeff, Jupp, Martyn, Nickson, Keith and Allport, John (2016) Investigation of an electrically assisted turbocharger with energy recovery for a heavy duty diesel engine. In: The 12th International Conference on Turbochargers and Turbocharging. Institution of Mechanical Engineers, London, pp. 319-330. ISBN 978-0-9572374-7-6

An electrically assisted turbocharger is an advanced boosting technology that enhances the overall performance and reduces emissions of downsized engines. This paper investigates the effect of electric turbo assist [ETA] technology on a heavy duty, on-road diesel engine during steady state operation using a GT-Power 1-D engine simulation model. Two key findings have been observed: [1] Increasing assisting power at fixed torque, AFR and EGR rate values, leads to a reduction in pumping work, enhanced engine efficiency and reduced compressor mass flow, pressure ratio and turbocharger shaft speed. [2] Contrary to expectations, a fuel economy benefit was observed whilst assisting the turbocharger during high engine speed/full load operation and recovering energy at relatively low engine speeds and loads.

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