MG-IVT: An Infinitely Variable Transmission With Optimal Power Flows

Bottiglione, Francesco; Mantriota, Giacomo

doi:10.1115/1.2976802

Cited by 27 publications

(16 citation statements)

References 19 publications

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“…Considering Figure 7(a), equation (19) is valid but, in this case, P 3 , which has the same value in the ideal system (P 3 id ) and in the real system (P 3 re ), is the input power of the ECVT. The power loss in the ECVT of the real ECVT eq can be expressed as a function of the power P 3 re (Figure 11) according to…”

Section: Compound Split In Direct Operation With Type III Power Flowmentioning

confidence: 96%

A simple model for compound split transmissions

Pinto

Mantriota

2013

Proceedings of the Institution of Mechanical Engineers, Part D:

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Hybrid vehicles are the most promising technologies that can lead to significant improvements in the efficiency and the performance of a vehicle through several drivetrain architectures. The automotive research is direct towards architectures with multiple modes. In this context, design and optimal control models of these transmissions are of great importance. In order to obtain a simple model, we propose a novel and original approach for evaluating the performance of a compound electric continuously variable transmission. A 'four-port mechanical power-split device' is examined and, using this, a novel method is described by considering an 'equivalent electric continuously variable transmission' within a power split. Finally, kinematic conditions are obtained to evaluate which power flow occurs and to determine simple models for the efficiency of the transmission.

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Section: Compound Split In Direct Operation With Type III Power Flowmentioning

confidence: 96%

A simple model for compound split transmissions

Pinto

Mantriota

2013

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…In past research various power split devices were theoretically analyzed with focus on efficiency [21][22][23] and in some cases they were experimentally implemented and assessed on vehicles. For example, [24,25] experimentally verified some power split configurations on a test rig, also adopted for the characterization of particular operating conditions, like that of neutral gear in [26], and the evaluation of possible novel transmission layouts in [27]. In HEVs and BEVs with IVTs, during brake regeneration the transmission works in reverse mode, with a lower efficiency than in direct mode [28,29].…”

Section: Introductionmentioning

confidence: 99%

Energy Consumption of a Battery Electric Vehicle with Infinitely Variable Transmission

et al. 2014

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Battery electric vehicles (BEVs) represent a possible sustainable solution for personal urban transportation. Presently, the most limiting characteristic of BEVs is their short range, mainly because of battery technology limitations. A proper design and control of the drivetrain, aimed at reducing the power losses and thus increasing BEV range, can contribute to make the electrification of urban transportation a convenient choice. This paper presents a simulation-based comparison of the energy efficiency performance of six drivetrain architectures for BEVs. Although many different drivetrain and transmission architectures have been proposed for BEVs, no literature was found regarding BEVs equipped with infinitely variable transmissions (IVTs). The analyzed drivetrain configurations are: single-(1G) and two-speed (2G) gear drives, half toroidal (HT) and full toroidal (FT) continuously variable transmissions (CVTs), and infinitely variable transmissions (IVTs) with two different types of internal power flow (IVT-I and IVT-II). An off-line procedure for determining the most efficient control action for each drivetrain configuration is proposed, which allows selecting the optimal speed ratio for each operating condition. The energy consumption of the BEVs is simulated along the UDC (Urban Driving Cycle) and Japanese 10-15 driving cycle, with a backward facing approach. In order to achieve the OPEN ACCESSEnergies 2014, 7 8318 lowest energy consumption, a trade-off between high transmission efficiency and flexibility in terms of allowed speed ratios is required.

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“…For these reasons, it has been demonstrated that there is not any energy convenience when using shunted architectures with respect to, for instance, one toroidal CVT, because the enlargement of the ratio spread is counterbalanced by the average lower efficiency of the transmission [20,21]. In order to improve their efficiency performance, multiple mode devices could be used [22], but these devices have drawbacks in terms of size, weight and cost.…”

Section: Introductionmentioning

confidence: 99%

The Fuel Economy of Hybrid Buses: The Role of Ancillaries in Real Urban Driving

et al. 2014

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In the present context of the global economic crisis and environmental emergency, transport science is asked to find innovative solutions to turn traditional vehicles into fuel-saving and eco-friendly devices. In the last few years, hybrid vehicles have been shown to have potential benefits in this sense. In this paper, the fuel economy of series hybrid-electric and hybrid-mechanical buses is simulated in two real driving situations: cold and hot weather driving in the city of Taranto, in Southern Italy. The numerical analysis is carried out by an inverse dynamic approach, where the bus speed is given as a velocity pattern measured in the field tests performed on one of the city bus routes. The city of Taranto drive schedule is simulated in a typical tempered climate condition and with a hot temperature, when the air conditioning system must be switched on for passenger comfort. The fuel consumptions of hybrid-electric and hybrid-mechanical buses are compared to each other and with a traditional bus powered by a diesel engine. It is shown that the series hybrid-electric vehicle outperforms both the traditional and the mechanical hybrid vehicles in the cold weather driving simulation, reducing the fuel consumption by about 35% with respect to the traditional diesel bus. However, it is also shown that the performance of the hybrid-electric bus gets dramatically worse when the air-cooling system is continuously turned on. In this situation, the fuel consumption of the three different technologies for city buses under investigation is comparable.

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MG-IVT: An Infinitely Variable Transmission With Optimal Power Flows

Cited by 27 publications

References 19 publications

A simple model for compound split transmissions

A simple model for compound split transmissions

Energy Consumption of a Battery Electric Vehicle with Infinitely Variable Transmission

The Fuel Economy of Hybrid Buses: The Role of Ancillaries in Real Urban Driving

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