Evaluation of the dedicated range-extender transmission powertrain concept DE-REX regarding efficiency, costs and complexity – Comparative assessment of electric and hybrid powertrain configurations b...

Viehmann, Andreas; Schleiffer, J.-E.; Rinderknecht, Stephan

doi:10.51202/9783181023549-i-21

Cited by 1 publication

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To solve this problem of conflicting development goals, two-speed BEV can be used. In previous research it has been shown that two-speed BEV transmissions allow for a reduction of electric consumption [1][2][3][4][5][6][7][8] as well as for a potential downsizing of the EM [8][9][10]. Various concepts for multi-speed BEV with one EM have been presented by academia and industry (overviews are given in [11] and [12]).…”

Section: Technical University Of Darmstadtmentioning

confidence: 99%

“…Based on the VDI-Berichte Nr. 2401, 2022 generic topology of the TDT, multiple purely electric and also hybrid vehicles have been derived and investigated in public funded projects (Speed2E, Speed4E [14], DE-REX [10] & DE4LORA [15]). Besides the TDT-concept, other multi-speed BEV-concepts with two EM are under research (like [16]) or even already entering the market.…”

Section: Technical University Of Darmstadtmentioning

confidence: 99%

See 1 more Smart Citation

Potentials to reduce the Energy Consumption of Electric Vehicles in Urban Traffic

Eßer,

Mölleney,

Rinderknecht

2022

Dritev 2022

Self Cite

View full text Add to dashboard Cite

By means of a parameter study using a detailed backwards facing model of the longitudinal vehicle dynamics, the design of the transmission ratio in battery electric vehicles (BEV) is analyzed for different driving cycles and it is shown that the electric consumption in urban operation can be significantly reduced by up-speeding the electric machine (EM) using a high 1 st transmission ratio. But this potential currently remains unused in fixed-speed BEV due to various additional driving requirements of extra-urban driving with higher vehicle speeds. For this reason, multi-speed BEV are further investigated as a solution to the conflicting design objectives. An additional parameter study for multi-speed BEV with two transmission ratios shows further potentials for the reduction of electric consumption both in urban and extra-urban driving scenarios. Furthermore, the more complex "Two-Drive-Transmission" (TDT) concept is investigated as a multi-speed BEV powertrain with two downsized EMs instead of one highpower EM and it is compared with the other BEV variants using a comparative optimization approach. The TDT uses low-cost and energetically efficient shifting devices based on the technology of an automated manual transmission with simple dog clutches without friction surfaces, allowing shifting without interruption of traction force. Dynamic programming is applied as operational strategy for all simulations considering shifting losses to achieve a benchmarking of the potentials of fixed-speed and multi-speed BEV.

show abstract