Design of a Clutchless Hybrid Transmission for a High-Performance Vehicle
There exists the potential for major simplifications to current hybrid transmission architectures, which can lead to advances in powertrain performance. This paper assesses the technical merits of various hybrid powertrains in the context of high-performance vehicles and introduces a new transmissio...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | en_US |
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ASME
2018
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| Online Access: | http://hdl.handle.net/1721.1/117392 https://orcid.org/0000-0002-9757-382X https://orcid.org/0000-0002-3495-0245 https://orcid.org/0000-0002-9063-5653 https://orcid.org/0000-0002-5540-7401 https://orcid.org/0000-0002-4040-6705 https://orcid.org/0000-0001-9233-2245 https://orcid.org/0000-0002-4151-0889 |
| _version_ | 1811096213910454272 |
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| author | Jacoby, Chad Lawrence Jo, Young Suk Jurewicz, Jacob M. Pamanes Castillo, Guillermo Siegel, Joshua E Yen, Patricia Dorsch, Daniel S. Winter, Amos G. |
| author2 | Massachusetts Institute of Technology. Department of Mechanical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Mechanical Engineering Jacoby, Chad Lawrence Jo, Young Suk Jurewicz, Jacob M. Pamanes Castillo, Guillermo Siegel, Joshua E Yen, Patricia Dorsch, Daniel S. Winter, Amos G. |
| author_sort | Jacoby, Chad Lawrence |
| collection | MIT |
| description | There exists the potential for major simplifications to current hybrid transmission architectures, which can lead to advances in powertrain performance. This paper assesses the technical merits of various hybrid powertrains in the context of high-performance vehicles and introduces a new transmission concept targeted at high performance hybrid applications. While many hybrid transmission configurations have been developed and implemented in mainstream and even luxury vehicles, ultra high performance sports cars have only recently begun to hybridize. The unique performance requirements of such vehicles place novel constraints on their transmissions designs. The goals become less about improved efficiency and smoothness and more centered on weight reduction, complexity reduction, and performance improvement. To identify the most critical aspects of a high performance transmission, a wide range of existing technologies is studied in concert with basic physical performance analysis of electrical motors and an internal combustion engine. The new transmission concepts presented here emphasize a reduction in inertial, frictional, and mechanical losses. A series of conceptual powertrain designs are evaluated against the goals of reducing mechanical complexity and maintaining functionality. The major innovation in these concepts is the elimination of a friction clutch to engage and disengage gears. Instead, the design proposes that the inclusion of a large electric motor enables the gears to be speed-matched and torque-zeroed without the inherent losses associated with a friction clutch. Additionally, these transmission concepts explore the merits of multiple electric motors and their placement as well as the reduction in synchronization interfaces. Ultimately, two strategies for speed-matched gear sets are considered, and a speed-matching prototype of the chosen methodology is presented to validate the feasibility of the proposed concept. The power flow and operational modes of both transmission architectures are studied to ensure required functionality and identify further areas of optimization. While there are still many unanswered questions about this concept, this paper introduces the base analysis and proof of concept for a technology that has great potential to advance hybrid vehicles at all levels. |
| first_indexed | 2024-09-23T16:40:23Z |
| format | Article |
| id | mit-1721.1/117392 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T16:40:23Z |
| publishDate | 2018 |
| publisher | ASME |
| record_format | dspace |
| spelling | mit-1721.1/1173922022-10-03T07:31:41Z Design of a Clutchless Hybrid Transmission for a High-Performance Vehicle Jacoby, Chad Lawrence Jo, Young Suk Jurewicz, Jacob M. Pamanes Castillo, Guillermo Siegel, Joshua E Yen, Patricia Dorsch, Daniel S. Winter, Amos G. Massachusetts Institute of Technology. Department of Mechanical Engineering Massachusetts Institute of Technology. Institute for Data, Systems, and Society Massachusetts Institute of Technology. Laboratory for Nuclear Science Sloan School of Management Subirana, Brian Jacoby, Chad Lawrence Jo, Young Suk Jurewicz, Jacob M. Pamanes Castillo, Guillermo Siegel, Joshua E Yen, Patricia Dorsch, Daniel S. Winter, Amos G. There exists the potential for major simplifications to current hybrid transmission architectures, which can lead to advances in powertrain performance. This paper assesses the technical merits of various hybrid powertrains in the context of high-performance vehicles and introduces a new transmission concept targeted at high performance hybrid applications. While many hybrid transmission configurations have been developed and implemented in mainstream and even luxury vehicles, ultra high performance sports cars have only recently begun to hybridize. The unique performance requirements of such vehicles place novel constraints on their transmissions designs. The goals become less about improved efficiency and smoothness and more centered on weight reduction, complexity reduction, and performance improvement. To identify the most critical aspects of a high performance transmission, a wide range of existing technologies is studied in concert with basic physical performance analysis of electrical motors and an internal combustion engine. The new transmission concepts presented here emphasize a reduction in inertial, frictional, and mechanical losses. A series of conceptual powertrain designs are evaluated against the goals of reducing mechanical complexity and maintaining functionality. The major innovation in these concepts is the elimination of a friction clutch to engage and disengage gears. Instead, the design proposes that the inclusion of a large electric motor enables the gears to be speed-matched and torque-zeroed without the inherent losses associated with a friction clutch. Additionally, these transmission concepts explore the merits of multiple electric motors and their placement as well as the reduction in synchronization interfaces. Ultimately, two strategies for speed-matched gear sets are considered, and a speed-matching prototype of the chosen methodology is presented to validate the feasibility of the proposed concept. The power flow and operational modes of both transmission architectures are studied to ensure required functionality and identify further areas of optimization. While there are still many unanswered questions about this concept, this paper introduces the base analysis and proof of concept for a technology that has great potential to advance hybrid vehicles at all levels. Ferrari-F.lli Lunelli, s.p.a. 2018-08-17T14:38:18Z 2018-08-17T14:38:18Z 2015-08 Article http://purl.org/eprint/type/ConferencePaper 978-0-7918-5720-5 http://hdl.handle.net/1721.1/117392 Jacoby, Chad L., et al. “Design of a Clutchless Hybrid Transmission for a High-Performance Vehicle.” ASME 2015 Power Transmission and Gearing Conference; 23rd Reliability, Stress Analysis, and Failure Prevention Conference, 2-5 August, 2015, Boston, Massachusetts, ASME, 2015, p. V010T11A056. https://orcid.org/0000-0002-9757-382X https://orcid.org/0000-0002-3495-0245 https://orcid.org/0000-0002-9063-5653 https://orcid.org/0000-0002-5540-7401 https://orcid.org/0000-0002-4040-6705 https://orcid.org/0000-0001-9233-2245 https://orcid.org/0000-0002-4151-0889 en_US http://dx.doi.org/10.1115/DETC2015-46812 ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference 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. application/pdf ASME ASME |
| spellingShingle | Jacoby, Chad Lawrence Jo, Young Suk Jurewicz, Jacob M. Pamanes Castillo, Guillermo Siegel, Joshua E Yen, Patricia Dorsch, Daniel S. Winter, Amos G. Design of a Clutchless Hybrid Transmission for a High-Performance Vehicle |
| title | Design of a Clutchless Hybrid Transmission for a High-Performance Vehicle |
| title_full | Design of a Clutchless Hybrid Transmission for a High-Performance Vehicle |
| title_fullStr | Design of a Clutchless Hybrid Transmission for a High-Performance Vehicle |
| title_full_unstemmed | Design of a Clutchless Hybrid Transmission for a High-Performance Vehicle |
| title_short | Design of a Clutchless Hybrid Transmission for a High-Performance Vehicle |
| title_sort | design of a clutchless hybrid transmission for a high performance vehicle |
| url | http://hdl.handle.net/1721.1/117392 https://orcid.org/0000-0002-9757-382X https://orcid.org/0000-0002-3495-0245 https://orcid.org/0000-0002-9063-5653 https://orcid.org/0000-0002-5540-7401 https://orcid.org/0000-0002-4040-6705 https://orcid.org/0000-0001-9233-2245 https://orcid.org/0000-0002-4151-0889 |
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