Power Flows in Compound Transmissions for Hybrid Vehicles

Pinto, Stefano De; Mantriota, Giacomo

doi:10.3390/machines7010019

Cited by 10 publications

(9 citation statements)

References 18 publications

(30 reference statements)

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“…This assumption is introduced because the efficiency of the eCVT is generally very low compared to the efficiency of the planetary gear trains. With this assumption, the global efficiency can be calculated as follows η gl = P i + P Loss P i (20) The conservation of energy applied to the node connecting the input to shafts 1 and 3 leads to:…”

Section: Efficiencymentioning

confidence: 99%

“…Our research group has recently studied the power flows and efficiency of the PS-CVT [18][19][20]. In these previous works, the analysis of a "four-port-mechanical-power split device" was proposed.…”

Section: Introductionmentioning

confidence: 99%

“…Figure 1 shows the four possible set-ups. While types A, B and D have been discussed in [18][19][20], in this paper, we focus on type C. The power flow and the efficiency of this "four-port-mechanical-power split device" are defined and its performance assessed with a numerical example.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Performance Evaluation of a Compound Power-Split CVT for Hybrid Powertrains

2021

Self Cite

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The Power-Split Continuously Variable Transmission is one of the most promising architectures for Hybrid Electric Vehicles. These systems have been introduced to improve vehicle global efficiency since they can maximize the efficiency in varying operating conditions. During the design stage, the availability of modeling tools would play a key role in achieving optimal design and control of these architectures. In this work, a compound power split device that combines an electric Continuously Variable Transmission with two planetary gear trains is analyzed. A comprehensive model is derived that allows the different power flow configurations to be evaluated given the properties of the single subcomponents of the system. The efficiency of the powertrain can be derived as well, and a numerical example is provided. The architecture studied has an efficiency that can be higher than that obtained using one single eCVT for most of the global transmission ratio range, showing that this solution could be suitable as a part of a more complex compound transmission that engages in a specific speed range.

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Section: Efficiencymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Performance Evaluation of a Compound Power-Split CVT for Hybrid Powertrains

2021

Self Cite

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“…In addition to the functions or driving modes realized by THS-IV, two more driving modes, namely compoundpower-split (compound-eCVT) and parallel mode [9], are realized in the Voltec II to improve efficiency under high vehicle speed. General Motor, for the first time, combines the input-and compound-power-split in one DHT, which benefits the economic performance and the reduction of the power demand for two electric motors [10]. The realized modes of Voltec II are displayed in Table 2.…”

Section: Dual-mode Dht: Voltec IImentioning

confidence: 99%

Study of Series-Parallel and Power-Split DHT for Hybrid Powertrains

Chen

Küçükay

2021

Automot. Innov.

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Dedicated hybrid transmission (DHT) is the developing trend of hybrid transmissions. This paper studies different types of DHTs regarding the structure, function, and performance. Firstly, the structure and function of different well-known DHTs in the market are discussed and analyzed. Through the analysis, the reasonability and necessity of the different modes and the electric motor power requirements that lie behind different DHTs are derived. Secondly, the dynamics of different DHTs are further compared with the driving areas in different modes under different driving conditions. Then, the basic or minimum dynamic requirements are defined and taken into consideration before the economic comparison. To ensure the effectiveness of the comparison, the optimization of the configurations for each kind of DHT is carried out with the modular simulation model. The economic comparison is conducted under the premise of excluding the influences of the configurations in the results. Finally, the sensitivity and influence of different engine characteristics for different DHTs are studied to find out the sensibilities of the two kinds of DHTs with engine technology. Through these studies, the essential differences and features of different DHTs can be derived to help better understand the decision in choosing the technical route for the original equipment manufacturers.

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“…Multi-PG PSU enables the minimization of the electric machines' power size by deploying a multi-mode power-split continuously variable transmission (PS-CVT), where some clutches operations lead to several constructive arrangements to select under the desired driving conditions [6][7][8][9][10]. Nevertheless, the more complex the transmission constructive layout is, the trickiest the identification of the occurring power flows is [11][12][13], as well as their management [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Power Losses Minimization for Optimal Operating Maps in Power-Split HEVs: A Case Study on the Chevrolet Volt

Castellano

Cammalleri

2021

Applied Sciences

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The power-split architecture is the most promising hybrid electric powertrain. However, a real advantage in energy saving while maintaining high performance can be achieved only by the implementation of a proper energy management strategy. This requires an optimized functional design before and a comprehensive analysis of the powertrain losses after, which could be rather challenging owing to the constructive complexity of the power-split transmission, especially for multi-mode architecture with multiple planetary gearing. This difficulty was overcome by a dimensionless model, already available in the literature, that enables the analysis of any power-split transmission, even in full electric operation. This paper relies on this approach to find the operating points of the internal combustion engine and both electric machines which minimize the total power losses. This optimization is carried out for given vehicle speed and demanded torque, by supposing different scenarios in respect of the battery capability of providing or gathering power. The efficiency of the thermal engine and the electric machines is considered, as well as the transmission mechanical power losses. The aim is to provide a global efficiency map that can be exploited to extract data for the implementation of the most suitable real-time control strategy. As a case study, the procedure is applied to the multi-mode power-split system of the Chevrolet Volt.

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Power Flows in Compound Transmissions for Hybrid Vehicles

Cited by 10 publications

References 18 publications

Performance Evaluation of a Compound Power-Split CVT for Hybrid Powertrains

Performance Evaluation of a Compound Power-Split CVT for Hybrid Powertrains

Study of Series-Parallel and Power-Split DHT for Hybrid Powertrains

Power Losses Minimization for Optimal Operating Maps in Power-Split HEVs: A Case Study on the Chevrolet Volt

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