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Cooling Performance of Fresh and Aged Automatic Transmission Fluids for Hybrid Electric Vehicles.

Rivera, N., Viesca, J. L., Garcia, A., Prado, J. I., Lugo, L. and Hernandez Battez, A., 2022. Cooling Performance of Fresh and Aged Automatic Transmission Fluids for Hybrid Electric Vehicles. Applied Sciences, 12 (17), 8911.

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applsci-12-08911-v2.pdf - Published Version
Available under License Creative Commons Attribution.


DOI: 10.3390/app12178911


The cooling performance of automatic transmission fluids (ATFs) plays an important role in hybrid electrical vehicles, in which the electric motor (EM) is placed inside the transmission housing due to their mission of cooling the EM. The cooling performance of the ATFs depends on their thermophysical properties, but these properties change with the oxidation of the ATFs. This work studies the influence of the oxidation of three ATFs (A, B, C) on their thermophysical properties, as well as on some figures-of-merit (FOMs) which are relevant for evaluating the cooling performance. The results indicated that the influence of the molecular structure on thermal conductivity and heat capacity is stronger than on density and viscosity, whereas the molecular structure hardly affects the FOMs of the fresh ATFs; ATFs B and C, formulated with base oils from API Group III, indicated better cooling performance than ATF A which was formulated with base oils from API Group I; the sensitivity to temperature of the variation with oxidation of the studied properties, including the FOMs, was almost null, except for ATF A; therefore, FOMs should be used to compare the cooling performance of ATFs for electric drivetrains instead of a single property, such as thermal conductivity.

Item Type:Article
Additional Information:This article belongs to the Section Applied Physics
Uncontrolled Keywords:automatic transmission fluids; hybrid electric vehicles; thermal conductivity; heat capacity; viscosity; density
Group:Faculty of Science & Technology
ID Code:37534
Deposited By: Symplectic RT2
Deposited On:21 Sep 2022 10:37
Last Modified:21 Sep 2022 10:37


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