One very effective way to improve fuel economy of motor vehicles is to reduce the viscosity of the automatic transmission fluid (ATF). However, viscometric constraints often exist for a particular ATF application. The proper choice of viscosity index (VI) improver allows viscosity reduction at lower temperatures, while maintaining viscosity at higher temperatures. This study shows that molecular weight of a VI improver is a key factor to achieve high thickening efficiency, improved shear stability and limited metal fatigue failure simultaneously. Based on this study, an optimum VI improver has been found and a new fuel economy ATF was developed.
Study of Viscosity Index Improver for Fuel Economy ATF
Sae Technical Papers
SAE Powertrain & Fluid Systems Conference & Exhibition ; 2003
2003-10-27
Conference paper
English
Study of viscosity index improver for fuel economy ATF
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