Efficiency Evaluation of Lower Viscosity ATF in a Planetary Automatic Transmission for Improved Fuel Economy
燃料経済性改善のための遊星自動変速機における低粘度ATF(自動変速機潤滑油)の効率評価
- Delivery
- Provide download link
- Format
- Price
- Non-members (tax incl.)：￥8,250 Members (tax incl.)：￥6,600
- Publication code
- 20191177
- Paper/Info type
- SAE Paper
No.2019-01-1296
- Pages
- 1-8(Total 8 p)
- Date of publication
- Apr 2019
- Publisher
- SAE International
- Language
- English
- Event
- WCX™ 2019 World Congress Experience
Detailed Information
| Category(E) | [Advanced Propulsion/Powertrain] Transmission Systems/Drive Unit |
|---|---|
| Author(E) | 1) Haiying Tang, 2) Khaled Zreik, 3) Hiroko Ohtani, 4) Thomas D'Anna, 5) Jason E. Murtagh, 6) Thomas Wellmann |
| Affiliation(E) | 1) FCA US LLC, 2) General Motors LLC, 3) Ford Motor Company, 4) FEV North America Inc., 5) FEV North America Inc., 6) FEV North America Inc. |
| Abstract(J) | 従来のATF(40℃で25.1cSt)と比較して低粘度ATF(40℃で18.2cSt)の損失の定量化を検討した．変速機効率を試験ベンチ，車両ベースシャーシダイナモで調べた．低粘度流体を使用することによって損失挙動が改善されるが，改善は歯車，温度に依存し変速機のハードウェアが低粘度流体向けに設計されていない場合は利得が帳消しになることがわかった． Translation |
| Abstract(E) | With continued industry focus on reducing parasitic transmission and driveline losses, detailed studies are required to quantify potential enablers to improve vehicle fuel economy. Investigations were undertaken to understand the influence of lower viscosity Automatic Transmission Fluids (ATF) on transmission efficiency as compared with conventional fluids. The objectives of this study were to quantify the losses of lower viscosity ATF as compared with conventional ATF, and to understand the influence of ATF properties including viscosities, base oil types, and additive packages on fuel efficiency. The transmission efficiency investigations were conducted on a test bench following a vehicle-based break-in of the transmission using a prescribed drive cycle on a chassis dynamometer. At low temperature, the lower viscosity ATF showed a clear advantage over the conventional ATF in both spin loss and loaded efficiency evaluations. At high temperature, mixed results were obtained; it appeared the chemistry of ATF influenced the results. Overall, using the low viscosity fluid tends to improve loss behavior, but the benefits can be offset if the transmission hardware employed is not specifically designed for low viscosity fluids. Potential noise factors of the test method were discussed along with the strategies to reduce them which included oil flushing method, break-in method, and selection of test transmission design. This project was undertaken and financially supported by the Transmission Working Group (TWG) of the United States Council of Automotive Research (USCAR). |
