Abstract
In this paper, starting from the measurements available for a 2000 cm3 turbocharged diesel engine, an analytical model of the turbocharger is proposed and validated. The model is then used to extrapolate the efficiency of a power unit with a diesel engine combined with a turbocompound system. The obtained efficiency map is used to evaluate the fuel economy of a supercapacitor-based series hybrid vehicle equipped with the turbocompound power unit. The turbocompound model, in accordance with the studies available in the technical literature, shows that the advantages (in terms of efficiency increase) are significant at high loads. For this reason, turbocompound introduction allows a significant efficiency improvement in a series hybrid vehicle, where the engine always works at high-load. The fuel economy of the proposed vehicle is compared with other hybrid and conventional vehicle configurations.
Highlights
The main novel contribution ofare thisfinally paperpointed can be pinpointed as follow: (1) efficiency map for a 2000 cm3 turbocompound diesel engine is evaluated starting from measured values on a Evaluation traditional turbocharged diesel engine; (2) turbocompound contribution to a hybrid series architecture medium size car based on supercapacitor storage is analyzed
From traditional turbochargers, where the energy produced by the turbine is used only to move the compressor (C), in the turbocompound system part
From traditional turbochargers, where the energy the turbine is generated with a reduction in internal combustion engine (ICE) generation; the optimization of the power produced by the turbinethe is used only to move compressor (C),separately, in the turbocompound part unit cannot consider optimization of thethe two subsystems but has to besystem a combined ofoptimization the power produced by the turbine delivered since and used outside the turbocharger
Summary
The increasing interest in sustainable mobility has led to the study and development of new hybrid architectures, which can be mainly divided in three main categories [1]: parallel [2,3,4,5,6], series/parallel ( known as power-split) [6,7,8,9,10,11,12,13,14], and series hybrid [15,16,17,18,19,20,21]. As observed by Jain et al [23], turbocompound conditions are quite occasional in real road missions, they do not render beneficial the introduction of the TC system; as a matter of fact, turbocompounding benefits are substantial at high load [23,24,25,26,27,28] This aspect explains why today this technology is not used on medium size cars and is developed only for sportive cars or trucks and buses, characterized by frequent high load demand. For this reason, many studies [26,27,28,29,30] focused on turbocompound application to diesel engines above 12 L
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