Thermodynamic and Practical Benefits of Waste Energy Recovery Using an Electric Turbo-Generator Under Different Boosting Methods

Kiwan, Rani; Middleton, Richard H.; Stefanopoulou, Anna G.

doi:10.4271/2018-01-0851

Cited by 15 publications

(7 citation statements)

References 21 publications

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“…Recent developments in boosting systems have led to increased responsiveness and reduction of “turbo lag” as well as significant increases in the low-speed torque in the 1000- to 1500-r/min range 4,5 through improved matching of the air handling system and the engine. Additional solutions, such as electrified turbochargers, 6 separate electrified boosting and compounding devices, 7–9 and other forms of positive displacement 10 and, specifically, piston 11–13 compounding, that could facilitate light-duty exhaust compounding and transient responsiveness have been explored recently. These all provide a path to allow energy recovered from the second expansion that is not required by the first compression to be added to the crank output or otherwise stored for later use and offer interesting alternatives to the forms of compounding explored in this work.…”

Section: Introductionmentioning

confidence: 99%

Exploring light-duty internal combustion engine boosting and exhaust compounding strategies

Andruskiewicz

Durrett

Gopalakrishnan

et al. 2019

International Journal of Engine Research

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A set of two-cylinder engine concepts utilizing a supercharger and piston-compounding or turbine-compounding were compared to a supercharged, non-compounded engine modeled with a consistent methodology. The goals of this simulation were to utilize energy that otherwise would be bypassed around the turbine side of a turbocharger and redirect it to the crankshaft. Following previous modeling work on a different piston-compounded engine, the gains in performance and efficiency for these concepts were thoroughly analyzed to provide insight into the magnitudes and responsible mechanisms. It was found that the second expansion process from exhaust-compounding was able to significantly improve engine performance at moderate to high loads, but the level of benefits and low-load performance were highly dependent on the compounding technique.

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Section: Introductionmentioning

confidence: 99%

Exploring light-duty internal combustion engine boosting and exhaust compounding strategies

Andruskiewicz

Durrett

Gopalakrishnan

et al. 2019

International Journal of Engine Research

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show abstract

“…The engine fuel efficiency is impacted by the pumping losses which vary when the ET works as a motor or generator [19]. It has been shown that the ET optimal working condition can be determined by the exhaust pressure [20]. The ET decouples the intake manifold and exhaust manifold, which has been verified by multiple studies [21].…”

Section: Introductionmentioning

confidence: 99%

Real-Time Energy Management of the Electric Turbocharger Based on Explicit Model Predictive Control

Zhao

Stobart

Mason

2020

IEEE Trans. Ind. Electron.

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The electric turbocharger is a promising solution for engine downsizing. It provides great potential for vehicle fuel efficiency improvement. The electric turbocharger makes engines run as hybrid systems so critical challenges are raised in energy management and control. This paper proposes a real-time energy management strategy based on updating and tracking of the optimal exhaust pressure setpoint. Starting from the engine characterisation, the impacts of the electric turbocharger on engine response and exhaust emissions are analysed. A multivariable explicit model predictive controller is designed to regulate the key variables in the engine air system, while the optimal setpoints of those variables are generated by a high level controller. The two-level controller works in a highly efficient way to fulfill the optimal energy management. This strategy has been validated in physical simulations and experimental testing. Excellent tracking performance and sustainable energy management demonstrate the effectiveness of the proposed method. Index Terms-Electric turbocharger, real-time energy management, explicit model predictive controlDezong Zhao (M'12-SM'17) received the B.S. and M.S. degrees in control science and engineering from the School

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“…Recent developments in boosting systems have led to increased responsiveness and reduction in “turbo lag” as well as significant increases in the low-speed torque in the 1000 to 1500r/min range 4,5 through improved matching of the air handling system and the engine. Additional solutions that could facilitate light-duty exhaust compounding and transient responsiveness have been explored recently, such as electrified turbochargers, 6 separate electrified boosting and compounding devices, 7–9 and other forms of positive displacement 10 and specifically piston compounding. 11,12 These all provide a path to allow energy recovered from the second expansion that is not required by the first compression to be added to the crank output or otherwise stored for later use and offer interesting alternatives to the form of piston compounding explored in this article.…”

Section: Introductionmentioning

confidence: 99%

Dual-compression, dual-expansion piston engine assessment and optimization

Andruskiewicz

Durrett

Gopalakrishnan

et al. 2019

International Journal of Engine Research

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A dual-compression, dual-expansion engine concept utilizing thermal insulation, piston compressors and expanders is presented and analyzed to determine the potential for improved efficiency and performance. The engine design takes advantage of the ability to separate and optimize the different processes occurring in the cycle and to recover energy that otherwise would have been lost. Gains of approximately 10% over the baseline modern turbodiesel engine were realized at mid- to high loads due to more efficient pumping, expansion and heat transfer improvements. At low loads, the increased friction of the piston dual-compression, dual-expansion concept hurt the efficiency in comparison to the baseline.

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Thermodynamic and Practical Benefits of Waste Energy Recovery Using an Electric Turbo-Generator Under Different Boosting Methods

Cited by 15 publications

References 21 publications

Exploring light-duty internal combustion engine boosting and exhaust compounding strategies

Exploring light-duty internal combustion engine boosting and exhaust compounding strategies

Real-Time Energy Management of the Electric Turbocharger Based on Explicit Model Predictive Control

Dual-compression, dual-expansion piston engine assessment and optimization

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