Improved Comfort Analysis and Drivability Assessment by the Use of an Extended Power Train Model for Automatic Transmissions

Girstmair, Josef; Albertini, Philippe; Meitz, Klaus; Klinger, S.; Priebsch, Hans-Herwig; Reich, Franz Markus

doi:10.4271/2012-01-1529

Cited by 2 publications

(1 citation statement)

References 6 publications

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“…The addition of pendulum dampers permits lower lock-up speeds to be achieved, thereby decreasing the torque converter losses and helping to improve the fuel economy. 127,128 The effect of an increased gear number for automatic transmissions was studied previously. 74 When compared with a six-speed automatic transmission, a state-of-the-art eight-speed transmission shows up to 8% reduction in the fuel consumption over regulatory cycles.…”

Section: Managing Powertrain Energy Dissipationmentioning

confidence: 99%

A review of energy consumption, management, and recovery in automotive systems, with considerations of future trends

Chiara

Canova

2013

Proceedings of the Institution of Mechanical Engineers, Part D:

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In response to the current and future energy and environment challenges, the automotive industry is strongly focusing on improving the fuel efficiency of vehicles. Although the electrification of automotive powertrains is clearly the principal path towards sustainable transportation, many opportunities still exist to improve the fuel economy of conventional vehicles. However, some of the technical solutions representing the state of the art in research and advanced development are difficult to benchmark in terms of their potential benefits for fuel consumption improvement. A greater understanding of the fuel energy utilization on the vehicle (here intended as a ‘system’ ) is therefore necessary in order to identify the readily available opportunities for efficiency improvements and, ultimately, to develop automobiles which are more fuel efficient. To this extent, this paper presents a review of the state of the art and technology trends in the field of energy management and recovery for automotive systems, with the primary focus on conventional powertrains. An understanding of the fuel energy utilization and dissipation associated with the vehicle subsystems (the engine, transmission, and chassis) is provided, as well as an overview of the opportunities and potential challenges in improving the fuel economy through system-level energy management, recovery, and harvesting. Finally, an overview of the most important solutions for managing energy dissipation, energy recovery, and harvesting is presented, discussing their potential for fuel economy improvement, technical readiness, and challenges. Wherever possible, projections on fuel economy improvements, based on either experimental data or simulations, are reported to provide opportunity for the assessment and comparison of current and future technologies.

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Section: Managing Powertrain Energy Dissipationmentioning

confidence: 99%

A review of energy consumption, management, and recovery in automotive systems, with considerations of future trends

Chiara

Canova

2013

Proceedings of the Institution of Mechanical Engineers, Part D:

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Torque Converter Dynamic Characterization Using Torque Transmissibility Frequency Response Functions: Locked Clutch Operation

Jurmu,

Robinette,

Blough

et al. 2024

SAE Int. J. Passeng. Veh. Syst.

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<div>A unique torque converter test setup was used to measure the torque transmissibility frequency response function of four torque converter clutch dampers using a stepped, multi-sine-tone, excitation technique. The four torque converter clutch dampers were modeled using a lumped parameter technique, and the damper parameters of stiffness, damping, and friction were estimated using a manual, iterative parameter estimation process. The final damper parameters were selected such that the natural frequency and damping ratio of the simulated torque transmissibility frequency response functions were within 10% and 20% error, respectively, of the experimental modal parameters. This target was achieved for all but one of the tested dampers. The damper models include stiffness nonlinearities, and a speed-dependent friction torque due to centrifugal loading of the damper springs. Recommendations include further testing to separate the coulomb friction mechanism from the viscous damping mechanism, testing with the torque converter operating in open mode, and tests on a series of customized dampers with centrifugal pendulum absorber hardware.</div>

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Improved Comfort Analysis and Drivability Assessment by the Use of an Extended Power Train Model for Automatic Transmissions

Cited by 2 publications

References 6 publications

A review of energy consumption, management, and recovery in automotive systems, with considerations of future trends

A review of energy consumption, management, and recovery in automotive systems, with considerations of future trends

Torque Converter Dynamic Characterization Using Torque Transmissibility Frequency Response Functions: Locked Clutch Operation

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