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Improved Automatic Transmission Warmup - Stand Alone Oil to Air (OTA) Transmission Cooling Strategy with Thermostatic Cold Flow Bypass Valve
Technical Paper
2000-01-0963
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Event:
SAE 2000 World Congress
Language:
English
Abstract
The stand alone oil to air (OTA) transmission cooling strategy provides improved transmission cooling under high ambient air temperature operating conditions, which improves transmission reliability, durability and overall customer satisfaction. Another means of improving reliability and durability is through improved transmission warmup under low ambient air temperature operating conditions.
To allow for improved transmission warmup, a thermostatic cold flow bypass valve has been incorporated into the transmission oil cooler. The bypass valve shuts off flow to the transmission oil cooler until a predetermined fluid temperature has been achieved. Once this temperature is reached, oil is allowed to flow to the transmission oil cooler.
Visteon Climate Control Systems (VCCS) has tested both the stand alone OTA transmission cooling strategy with thermostatic cold flow bypass valve and the conventional transmission cooling strategy, comparing the transmission system warmup rates. The bypass valve allows the stand alone OTA transmission cooling system to warmup significantly faster than the conventional transmission cooling system. The conventional system does not receive any warmup benefits from the coolant.
Authors
Citation
Semel, R., "Improved Automatic Transmission Warmup - Stand Alone Oil to Air (OTA) Transmission Cooling Strategy with Thermostatic Cold Flow Bypass Valve," SAE Technical Paper 2000-01-0963, 2000, https://doi.org/10.4271/2000-01-0963.Also In
References
- Semel, R.R. “Stand Alone Oil to Air (OTA) Transmission Cooling Strategy” 1999 Vehicle Thermal Management Systems (VTMS4) Conference Proceedings Paper C543/088/99
- Soldner, J. “A New Compact Cooling Module for the Heat Management of Passenger Cars” 1999 Vehicle Thermal Management Systems (VTMS4) Conference Proceedings Paper C543/036/99
- Willermet; P.A. “ATF Bulk Oxidative Degradation and Its Effects on LVFA Friction and the Performance of a Modulated Torque Converter Clutch” 1998 SAE Technical Paper SAE- 982668
- Deen, H.E. “Automatic Transmission Fluids-Properties and Performance” 1984 SAE Technical Paper SAE- 841214