Next Generation Engine Start/Stop Systems: “Free-Wheeling”

Mueller, N.; Strauß, Steffen; Tumback, Stefan; Goh, G.S.; Christ, Ansgar

doi:10.4271/2011-01-0712

Cited by 25 publications

(13 citation statements)

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“…Variable compression ratios combined with variable valve actuation technology have also been shown to reduce fuel consumption by up to 13% over various drive cycles including the NEDC [6]. Cylinder Deactivation (CDA) and Stop/start have also been used by manufacturers to improve fuel consumption [7,8].…”

Section: Introductionmentioning

confidence: 99%

Fuel consumption and emission reduction by using a CVT in series with conventional multi-speed transmission

Walker

Huerta

Oglieve

et al. 2019

IJPT

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Fuel economy is a growing concern for both manufacturers within the automotive sector and consumers. Increasing government legislation is driving towards greener vehicles with reduced CO2 and NOx emissions and greater fuel economy, especially within urban environments. Manufacturers use new technologies in their powertrain systems to tackle these problems. This paper simulates and evaluates the performance of using a half toroidal CVT in series with a conventional multi-speed transmission, by analysing different shifting strategies to optimise fuel consumption and NOx emissions over the NEDC using this novel approach. The results show an 8.83% increase in fuel economy and up to an 11.34% reduction in NOx emissions is possible using this arrangement. The introduction of CVT adds a further 1.18% increase in fuel economy and 3.59% decrease in NOx emissions. The paper concludes that this novel arrangement should be considered by automotive manufacturers as a solution for improvements to powertrain technology.

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Section: Introductionmentioning

confidence: 99%

Fuel consumption and emission reduction by using a CVT in series with conventional multi-speed transmission

Walker

Huerta

Oglieve

et al. 2019

IJPT

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show abstract

“…Here, the value that provides the best results was retained for each scenario. Consumption results are summarized in Table II, where a comparison with the performance of the PMP method is made, given by relation (9). In [37] it is shown that this Hamiltonian based method, with a constant, drive cycle dependent adjoint state, gives close to global optimum results.…”

Section: Simulations and Results For Mpc With Sands Functionalitymentioning

confidence: 99%

“…One of the first papers which tackled the benefit of coasting in terms of fuel consumption for conventional vehicles was [9]. Two types of drive cycle were considered: NEDC (hard deceleration) and FTP-75 (small deceleration).…”

Section: State Of the Artmentioning

confidence: 99%

“…In this case, no pedal is pressed, the driveline is disengaged and thus, the vehicle is slowed down by resistive forces only. The benefit in fuel gain for conventional vehicles was analyzed in [9], [10], but existing MPC techniques do not include this feature to the best of the authors' knowledge. For a hybrid vehicle, an extension is possible, which includes energy recovery.…”

Section: Introductionmentioning

confidence: 99%

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Predictive Control Framework for HEV: Energy Management and Free-Wheeling Analysis

Stroe¹,

Olaru²,

Colin³

et al. 2019

IEEE Trans. Intell. Veh.

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The focus of this work is to exploit the potential of model predictive control for the energy management of hybrid electric vehicles. The global framework covers the power distribution between the internal combustion engine and the electric machine(s) in order to minimize the fuel consumption. Current technologies allow the forecast of speed profile and road grade making predictive control a viable solution. The gears within the prediction model are assumed to be pre-calculated at a higher level and therefore, only the torque split problem needs to be addressed by the energy management mechanism. Engine stop can improve fuel gain which is even more noticeable for hybrid vehicles and hence, its inclusion is naturally considered in the present study. Furthermore, optimization of the speed profile is addressed by introducing the freewheeling functionality.

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“…In recent years, significant progress has been made, e.g., through the development of downsized engines [2], engine start-and-stop functions [3] and electrified or fully electric drivetrain layouts [4][5][6][7]. However, important fuel consumption reductions can also be achieved through the implementation of energy-efficient transmission layouts, which are the focus of this study.…”

Section: Introductionmentioning

confidence: 99%

On the Energy Efficiency of Dual Clutch Transmissions and Automated Manual Transmissions

et al. 2017

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Abstract:The main benefits of dual clutch transmissions (DCTs) are: (i) a higher energy efficiency than automatic transmission systems with torque converters; and (ii) the capability to fill the torque gap during gear shifts to allow seamless longitudinal acceleration profiles. Therefore, DCTs are viable alternatives to automated manual transmissions (AMTs). For vehicles equipped with engines that can generate considerable torque, large clutch-slip energy losses occur during power-on gear shifts and, as a result, DCTs need wet clutches for effective heat dissipation. This requirement substantially reduces DCT efficiency because of the churning and ancillary power dissipations associated with the wet clutch pack. To the knowledge of the authors, this study is the first to analyse the detailed power loss contributions of a DCT with wet clutches, and their relative significance along a set of driving cycles. Based on these results, a novel hybridised AMT (HAMT) with a single dry clutch and an electric motor is proposed for the same vehicle. The HAMT architecture combines the high mechanical efficiency typical of AMTs with a single dry clutch, with the torque-fill capability and operational flexibility allowed by the electric motor. The measured efficiency maps of a case study DCT and HAMT are compared. This is then complemented by the analysis of the respective fuel consumption along the driving cycles, which is simulated with an experimentally validated vehicle model. In its internal combustion engine mode, the HAMT reduces fuel consumption by >9% with respect to the DCT.

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Next Generation Engine Start/Stop Systems: “Free-Wheeling”

Cited by 25 publications

References 0 publications

Fuel consumption and emission reduction by using a CVT in series with conventional multi-speed transmission

Fuel consumption and emission reduction by using a CVT in series with conventional multi-speed transmission

Predictive Control Framework for HEV: Energy Management and Free-Wheeling Analysis

On the Energy Efficiency of Dual Clutch Transmissions and Automated Manual Transmissions

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