Lightweight Design of Automotive Transmissions through Online and Real-time Lifetime Monitoring

Foulard, Stéphane; Rinderknecht, Stephan; Fietzek, Rafael

doi:10.1007/s38311-015-0111-0

Cited by 2 publications

(4 citation statements)

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“…External torques act through the ICE, EM, MB and driving resistance. For the recommended [19] consideration of the lower natural frequencies of the drivetrain, the dual mass flywheel (DMF), the side shafts and the tires were modeled elastically [34]. The wheel-to-ground contact is modelled ideally (i.e., ideal rolling), since special events such as loss of tire grip will not be investigated in this paper.…”

Section: T Desem =mentioning

confidence: 99%

“…FD is a gear of the final drive. An acting tangential force F is calculated using Equation (19). T is the acting torque on a gear wheel.…”

Section: φmentioning

confidence: 99%

“…For further information on the validation, transmission controls and loss calculation, we refer the reader to [35]. An acting tangential force F t is calculated using Equation (19). T G is the acting torque on a gear wheel.…”

Section: φmentioning

confidence: 99%

“…Major influences on damage include the clutch actuation in gearshifts, the inclusion of the lower drivetrain natural frequencies in the model and special events such as the loss of tire adhesion. Negative torques from ICE coast operation are indicated as negligible [19]. A load-related operating strategy for the vehicle is presented and discussed in detail in [20], regarding damage to gears.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Drivetrain Hybridization on Transmission Lifetime

et al. 2020

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Parallel hybrid drivetrains for passenger cars have additional electric drives compared to conventional drivetrains. In the event of vehicle deceleration, the electric drives are operated as generators, thus recovering kinetic energy through regeneration. If these drives are positioned upstream of the transmission input, regeneration power must be transferred by the transmission. This creates additional loads on the individual machine elements, which has a negative effect on the transmission lifetime. This paper investigates the influence of hybridization in terms of regeneration on the lifetime of bearings as highly critical elements in a dual clutch transmission. The vehicle simulation model employed in this study consists of an internal combustion engine, an electric motor, a mechanical drivetrain and the vehicle body, as well as a driver and a simple operating strategy. In this model, a detailed transmission model including its controls is embedded to determine its component loads. The resulting load spectra are used in a methodical approach to calculate the bearing lifetime of the transmission. The results show that the additional regenerative power flow reduces the bearing lifetime so that additional loads must be taken into account in the development and operation of transmission systems.

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Section: T Desem =mentioning

confidence: 99%

“…FD is a gear of the final drive. An acting tangential force F is calculated using Equation (19). T is the acting torque on a gear wheel.…”

Section: φmentioning

confidence: 99%