Configuration optimization for improving fuel efficiency of power split hybrid powertrains with a single planetary gear

Pei, Huanxin; Hu, Xiaosong; Yang, Yalian; Tang, Xiaolin; Cong, Huan; Cao, Dongpu

doi:10.1016/j.apenergy.2018.01.070

Cited by 77 publications

(37 citation statements)

References 37 publications

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“…In order to verify if the proposed analytical expressions properly model the turbocharger behavior, the efficiency in stationary flow (η t ) obtained with Equations (9), (10) and (22), starting from the available measurements, was compared with the value of η t available in the technical literature (which normally identify the combined effect of isentropic efficiency η T and mechanical efficiency in stationary flow η m ). The combined efficiency obtained with Equations (10), (12) and (22) is shown in Table 3 for the 20 analyzed points. The combined efficiency η T •η m in Table 3 can be plotted as a function of the expansion ratio β, obtaining the green rhombi in Figure 4.…”

Section: Of 20mentioning

confidence: 99%

“…As aforementioned, also the pulsation amplitude of the flow will reduce, due to the reduction of the ratio between the pressure inside the cylinder immediately before exhaust valve opening and the mean pressure in the pipe upstream the turbine, causing a reduction in the pulsating factor. Therefore, the power generated by the turbine is given by Equation 24: (12) and (22), whereas the red line shows the experimental results obtained in [38].…”

Section: Turbocompound Modelling: An Extrapolation Of Turbocharger Anmentioning

confidence: 99%

“…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 (also known as power-split) [6][7][8][9][10][11][12][13][14], and series hybrid [15][16][17][18][19][20][21]. Passalacqua et al [22] proposed a new series architecture configuration for medium size cars, with a storage system based only on supercapacitors and they highlighted the benefits in terms of internal combustion engine (ICE) optimal working points.…”

Section: Introductionmentioning

confidence: 99%

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Turbocompound Power Unit Modelling for a Supercapacitor-Based Series Hybrid Vehicle Application

et al. 2020

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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.

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Section: Of 20mentioning

confidence: 99%

Section: Turbocompound Modelling: An Extrapolation Of Turbocharger Anmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Turbocompound Power Unit Modelling for a Supercapacitor-Based Series Hybrid Vehicle Application

et al. 2020

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“…There are more than 1000 possible power-split configurations based on the combinations of planetary gear trains and power sources [10]. Recent studies for power-split hybrid electric vehicles have been published for different topics [19,20], and also, for power-split HHVs, it has been steadily studied by a variety of researchers and institutions since the 1980s.…”

Section: Introductionmentioning

confidence: 99%

System Characteristics Analysis for Energy Management of Power-Split Hydraulic Hybrids

Kwon

Ivantysynova

2020

Energies

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Hydraulic hybrid powertrains provide an opportunity for specific applications, such as heavy-duty vehicles based on high-power density, which has not been included in other types of hybrid powertrains. Among the various architectures of hybrid vehicles, power-split hybrids have a greater possibility of producing better fuel efficiency than other hybrid architectures. This study analyzed the possible energy-saving characteristics of power-split hydraulic hybrid vehicles (HHVs); this has not been comprehensively described in previous studies. A typical configuration of power-split HHVs was modeled with the FTP-72 driving cycle using a novel simulation method that considered the dynamic and thermal behaviors together. The characteristics were analyzed in comparison to a power-split hydrostatic transmission (HST), which is designed with the same conditions except for hydraulic energy storage. The power-split HHV not only has a better fuel efficiency, but it also shows system energy-saving characteristics. The power-split HHV has more chances for engine idling, which is directly related to fuel consumption savings due to engine stop. Additionally, more engine idling time enables the system to operate in a more efficient area on the engine map by load leveling. The results for the system temperature show that the power-split HHV offers the possibility to deliver better thermal management because it prevents the waste of braking power, which is especially crucial for hydraulic systems in comparison to other power systems such as electric or mechanical power systems. The ease of thermal management results in less energy consumption for cooling down the system temperature by minimizing the cooling system, as well as in a better thermal stability for the hydraulic system. The power-split HHV characteristics analyzed in this study can be used to design and organize the system control logic while developing power-split HHVs.

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“…In the technical literature, different hybrid topologies and many Energy Management Systems (EMS) were proposed [1,2] nevertheless hybrid architectures can be mainly divided in two categories: parallel and series hybrid vehicles. Regarding parallel architecture, this structure is mainly used on medium size cars and can be realized either with one electrical machine [3][4][5][6][7], two electrical machines and a planetary gearbox (also known as power split or series/parallel hybrid) [8][9][10][11][12][13][14] can be realized with a compound structured permanent-magnet motor [15]. As far as series architecture is concerned, this topology was mainly designed, until now, for urban bus applications [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Supercapacitor Storage Sizing Analysis for a Series Hybrid Vehicle

et al. 2019

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The increasing interest in Hybrid Electric Vehicles led to the study of new powertrain structures. In particular, it was demonstrated in the technical literature how series architecture can be more efficient, compared to parallel one, if supercapacitors are used as storage system. Since supercapacitors are characterized by high efficiency and high power density, but have low specific energy, storage sizing is a critical point with this technology. In this study, a detailed analysis on the effect of supercapacitor storage sizing on series architecture was carried out. In particular, in series architecture, supercapacitor storage sizing influences both engine number of starts and the energy that can be stored during regenerative braking. The first aspect affects the comfort, whereas the second aspect directly influences powertrain efficiency. Vehicle model and Energy Management System were studied and simulations were carried out for different storage energy, in order to define the optimal sizing.

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Configuration optimization for improving fuel efficiency of power split hybrid powertrains with a single planetary gear

Cited by 77 publications

References 37 publications

Turbocompound Power Unit Modelling for a Supercapacitor-Based Series Hybrid Vehicle Application

Turbocompound Power Unit Modelling for a Supercapacitor-Based Series Hybrid Vehicle Application

System Characteristics Analysis for Energy Management of Power-Split Hydraulic Hybrids

Supercapacitor Storage Sizing Analysis for a Series Hybrid Vehicle

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