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:  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.  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.
|Title of host publication||The 12th International Conference on Turbochargers and Turbocharging. Institution of Mechanical Engineers|
|Publication status||Published - 17 May 2016|
|Event||12th International Conference on Turbochargers and Turbocharging - London, United Kingdom|
Duration: 17 May 2016 → 18 May 2016
|Conference||12th International Conference on Turbochargers and Turbocharging|
|Period||17/05/16 → 18/05/16|
Rezk, A., Carter, J., Jupp, M., Nickson, A., & Allport, J. (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 (pp. 319-330)