Experimental Setup to Characterize Shift Time for High Performance Hybrid Transmissions
Name
v003t01a041-detc2018-85617.pdf
Size
1.96 MB
Format
Adobe PDF
Checksum (MD5)
da3124e7d80bfd493c0ec08b84335523
Author(s)
Dorsch, Daniel S.
Carrus, Justin W.
Xu, Zongying
Xu, Derrick
Winter, Amos G.
Wallach, Matthew Reno
Dokras, Nupur
Marquart, Timothy Leonard
Date Issued
August 2018
Journal
Proceedings of the ASME 2018 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
Publisher
American Society of Mechanical Engineers
Citation
Dorsch, Daniel S. et al. “Experimental Setup to Characterize Shift Time for High Performance Hybrid Transmissions.” Proceedings of the ASME 2018 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, 26-29 August, 2018, Quebec City, Quebec, Canada, ASME, 2018. © 2018 ASME
Version
Final published version
Abstract
Hybrid vehicles are increasingly common due to fuel efficiency regulations in place worldwide. High performance hybrids have typically been designed with a focus on improving performance, rather than the combination of both performance and efficiency. In order to improve efficiency of high performance cars, new hybrid architectures are necessary. When incorporating an electric motor, careful focus on operational modes allows for removal of certain elements, such as the reverse gear. Additionally, installing an electric motor directly coupled to the transmission without a clutch gives performance benefits, but requires detailed control of motor speed and novel methodology for shifting. In this paper, the design of an experimental setup for the electric drive in a high performance car hybrid transmission is presented. This architecture allows for characterization of synchronizer behavior during two different shifting methodologies. The first methodology is synchronizing a large rotational inertia with a small shaft speed difference (this differs from a gear shift in a traditional transmission with a large speed difference but small inertia). This situation is encountered when coupling an electric motor to the drivetrain, as the inertia of the electric motor is relatively large compared to a transmission layshaft, but the speed difference is small. The second is testing shifting of a synchronizer where dog tooth engagement happens immediately, with no friction cone to match the speed. This type of shifting is possible with precise electric motor speed control, sensing of the dog tooth position, and fast actuation. This methodology eliminates the need for a friction cone in the synchronizers, while maintaining fast gearshifts for performance driving. Our experimental setup for the electric drive in a hybrid transmission will be used to characterize synchronizer performance with these new shifting methodologies. The insights gained from this setup will aid in designing advanced hybrid architectures.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1115/DETC2018-85617
