Nine-Speed Automatic Transmission 9G-Tronic by Mercedes-Benz

Dörr, Christoph; Kalczynski, Henrik; Rink, Anton; Sommer, M.

doi:10.1007/s38311-014-0006-5

Cited by 7 publications

(4 citation statements)

References 3 publications

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“…For example, the structure diagrams of ATs shown in Figure 1 are obtained from Refs. [38][39][40], and the corresponding EGTs are converted into DBGs, where the results are presented in Figure 2. It is observed that the EGT used in ZF 9HP is 2-DOF and 11-link, while the corresponding DBG is 3-DOF and has 12 vertices.…”

Section: Configuration Synthesis Of 9-speed At Mechanismsmentioning

confidence: 99%

See 1 more Smart Citation

Configuration Synthesis and Performance Analysis of 9-Speed Automatic Transmissions

Ding

Cai

Chen

et al. 2020

Chin. J. Mech. Eng.

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Current research of automatic transmission (AT) mainly focuses on the improvement of driving performance, and configuration innovation is one of the main research directions. However, finding new configurations of ATs is one of the main limitations of configuration innovation. In the present study, epicyclic gear trains (EGTs) are applied to investigate mechanisms of 9-speed ATs. Then four kinematic configurations are proposed for automatic transitions. In order to evaluate the performance of proposed mechanisms, the lever analogy method is applied to conduct kinematic and mechanical analyses. The power flow analysis is conducted, and then transmission efficiencies are calculated based on the torque method. The comparative analysis between the proposed and existing mechanisms is carried out where obtained results show that proposed mechanisms have reasonable performance and can be used in ATs. The prototype of an AT is manufactured and the speed test is conducted, which proves the accuracy of analysis and the feasibility of proposed mechanisms.

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Section: Configuration Synthesis Of 9-speed At Mechanismsmentioning

confidence: 99%

“…The gear ratios and intervals of gear ratios of the existing AT mechanisms are obtained from Refs. [38][39][40]. Moreover, the transmission efficiencies of the existing AT mechanisms are calculated based on the lever analogy Figure 18 presents the comparative analysis of ranges of gear ratios of the seven AT mechanisms.…”

Section: Comparative Analysismentioning

confidence: 99%

Configuration Synthesis and Performance Analysis of 9-Speed Automatic Transmissions

Ding

Cai

Chen

et al. 2020

Chin. J. Mech. Eng.

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“…There is the potential to further reduce drag torque losses on the clutch lining surface by, for example, optimizing the groove pattern, groove shape and friction material. The design optimization of the clutch lining surface has been studied in simulation and experiment [73,74].…”

Section: Mechanical Systemmentioning

confidence: 99%

Progress in Automotive Transmission Technology

Dong

Liu

et al. 2018

Automot. Innov.

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Much progress has been made in the development of automotive transmissions over the past 20 years, e.g., an increased speed number, expanded ratio spread and improved efficiency and shift quality. Automotive transmissions are moving toward electrification in response to stringent legislation on emissions and the pressing demand for better fuel economy. This paper reviews progress in automotive transmission technology. Assisted by computer-aided programs, new transmission schemes are constantly being developed. We therefore first introduce the synthesis of the transmission scheme and parameter optimization. We then discuss the progress in the transmission technology of a conventional internal combustion engine vehicle in terms of new layouts; improved efficiency; noise, vibration and harshness technology; and the shifting strategy and control technology. As the major development trend, transmission electrification is subsequently discussed; this discussion includes the configuration design, energy management strategy, hybrid mode shifting control, single-speed and multi-speed electric vehicle transmission and distributed electric drive. Finally, a summary and outlook are presented for conventional automotive transmissions, hybrid transmissions and electric vehicle transmissions.

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“…The verification is carried out by measuring the transmission ratio while executing a test procedure on the virtual test bench. Table 2 shows the results of the verification and the design values R T of the transmission ratio presented by (Dörr et al, 2014). The transmission ratio is evaluated in steady state R stat T,sim and dynamic state R dyn T,sim .…”

Section: Verificationmentioning

confidence: 99%

Modeling of an Automatic Transmission for the Evaluation of Test Procedures in a Virtual End-of-Line Test Bench

Röper

Göres

Gühmann

2015

Linköping Electronic Conference Proceedings

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End-of-line tests for automatic transmissions are mandatory to ensure quality and safety. The interaction of unit under test, test bench and test automation leads to a high complexity in the development of test automation and test procedures. Validation of test automation and test procedures requires access to the test bench and the unit under test, both of which are only available close to startup of production. Therefore, virtualization of test bench and unit under test can be used to ease the bottleneck.Virtualization is a common tool in the development of electronic control units for automotive applications using SIL and HIL technologies. The properties of simulation models for a virtual end-of-line test bench differ from those for classical SIL and HIL environments. In this paper, an automatic transmission model suitable for a virtual end-of-line test bench is presented. The required characteristics of the multiple-disk clutch friction model are discussed in detail. Hydraulics are modeled using a Moore machine to enable simulation of the pressure build-up characteristics during shift operation. With the resulting model, the influence of the key parameter of a test procedure actuating an overlapping gearshift is investigated in a virtual test system.

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Nine-Speed Automatic Transmission 9G-Tronic by Mercedes-Benz

Cited by 7 publications

References 3 publications

Configuration Synthesis and Performance Analysis of 9-Speed Automatic Transmissions

Configuration Synthesis and Performance Analysis of 9-Speed Automatic Transmissions

Progress in Automotive Transmission Technology

Modeling of an Automatic Transmission for the Evaluation of Test Procedures in a Virtual End-of-Line Test Bench

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