Electric turbocharging for energy regeneration and increased efficiency at real driving conditions

TY - JOUR

T1 - Electric turbocharging for energy regeneration and increased efficiency at real driving conditions

AU - Dimitriou, Pavlos

AU - Burke, Richard

AU - Zhang, Qingning

AU - Copeland, Colin

AU - Stoffels, Harald

N1 - Publisher Copyright: © 2017 by the authors.

PY - 2017/4/1

Y1 - 2017/4/1

N2 - Modern downsized internal combustion engines benefit from high-efficiency turbocharging systems for increasing their volumetric efficiency. However, despite the efficiency increase, turbochargers often lack fast transient response due to the nature of the energy exchange with the engine, which deteriorates the vehicle's drivability. An electrically-assisted turbocharger can be used for improving the transient response without any parasitic losses to the engine while providing energy recovery for increasing overall system efficiency. The present study provides a detailed numerical investigation on the potential of e-turbocharging to control load and if possible replace the wastegate valve. A parametric study of the optimum compressor/turbine sizing and wastegate area was performed for maximum torque, fast response time and energy regeneration across the real driving conditions speed/load area of the engine. The results showed that the implementation of a motor-generator could contribute to reducing the response time of the engine by up to 90% while improving its thermal efficiency and generating up to 6.6 kWh of energy. Suppressing the wastegate can only be achieved when a larger turbine is implemented, which as a result deteriorates the engine's response and leads to energy provision demands at low engine speeds.

AB - Modern downsized internal combustion engines benefit from high-efficiency turbocharging systems for increasing their volumetric efficiency. However, despite the efficiency increase, turbochargers often lack fast transient response due to the nature of the energy exchange with the engine, which deteriorates the vehicle's drivability. An electrically-assisted turbocharger can be used for improving the transient response without any parasitic losses to the engine while providing energy recovery for increasing overall system efficiency. The present study provides a detailed numerical investigation on the potential of e-turbocharging to control load and if possible replace the wastegate valve. A parametric study of the optimum compressor/turbine sizing and wastegate area was performed for maximum torque, fast response time and energy regeneration across the real driving conditions speed/load area of the engine. The results showed that the implementation of a motor-generator could contribute to reducing the response time of the engine by up to 90% while improving its thermal efficiency and generating up to 6.6 kWh of energy. Suppressing the wastegate can only be achieved when a larger turbine is implemented, which as a result deteriorates the engine's response and leads to energy provision demands at low engine speeds.

KW - 1D simulation

KW - Boosting

KW - E-turbo

KW - Electrically-assisted

KW - Energy regeneration

KW - Internal combustion engines

KW - Turbo-compound

KW - Turbocharger

UR - http://www.scopus.com/inward/record.url?scp=85017353030&partnerID=8YFLogxK

U2 - 10.3390/app7040350

DO - 10.3390/app7040350

M3 - 文章

AN - SCOPUS:85017353030

SN - 2076-3417

VL - 7

JO - Applied Sciences (Switzerland)

JF - Applied Sciences (Switzerland)

IS - 4

M1 - 350

ER -