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ATF Characteristics Required for the Latest Automatic Transmissions
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English
Abstract
This paper examines the anti-shudder property of automatic transmission fluid (ATF) in terms of evaluation criteria and durability. The anti-shudder property is required for precise slip control around the clutch in that kind of automatic transmission, applications which are currently increasing.
To evaluate anti-shudder properties, friction characteristics are measured by modified Low Velocity Friction Apparatus (LVFA), and the data are compared with those from the actual vehicle. The analysis confirms that the occurrence of shudder on the vehicle is closely related to the ratio of the static friction coefficient to the dynamic one measured by modified LVFA.
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Citation
Ashikawa, R., Naruse, T., Kurashina, H., Matsuoka, T. et al., "ATF Characteristics Required for the Latest Automatic Transmissions," SAE Technical Paper 932849, 1993, https://doi.org/10.4271/932849.Also In
References
- Hiramatsu T. Akagi T. Yoneda H. “Control Technology of Minimal Slip-Type Torque Converter Clutch” SAE Paper 850460
- Miyazaki M. Hoshino M. “Evaluation of Vibration-Preventive Properties of Lubricating Oils in Wet Friction Plates & Retention of Such Properties Using a Friction Tester” SAE Paper 881694