Cooling performance of fresh and aged automatic transmission fluids for hybrid electric vehicles
| Autor: | Jose I. Prado, Jose Luis Viesca, Luis Lugo, Alberto García Martínez, Antolin Hernández Battez, NOELIA RIVERA RELLÁN |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
Fluid Flow and Transfer Processes
2213.02 Física de la Transmisión del Calor Process Chemistry and Technology automatic transmission fluids hybrid electric vehicles thermal conductivity heat capacity viscosity density General Engineering General Materials Science 3306 Ingeniería y Tecnología Eléctricas 2213 Termodinámica Instrumentation Computer Science Applications |
| Zdroj: | Scopus Applied Sciences; Volume 12; Issue 17; Pages: 8911 |
| ISSN: | 2076-3417 |
| Popis: | 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. Ministerio de Ciencia, Innovación y Universidades | Ref. PID2019-109367RB-I00 Principado de Asturias | Ref. PA-21-AYUD/2021/50987 |
| Databáze: | OpenAIRE |
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