Temperature management system for transmission
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United States of America Patent
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May 5, 2015
Grant Date -
Apr 18, 2013
app pub date -
Oct 14, 2011
filing date -
Oct 14, 2011
priority date (Note) -
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Abstract
An active/passive system for managing the temperature of fluid within an automatic transmission includes two heat exchangers, an active solenoid valve and a passive wax motor valve. A first heat exchanger provides transmission fluid heating and receives a flow of engine coolant. A second heat exchanger provides transmission fluid cooling and is exposed to ambient air. The solenoid valve which is preferably driven by a signal from a transmission control module (TCM) and the wax motor valve cooperate to provide three states of operation: transmission fluid heating, that is, heat added, cooling, that is, heat removed and pass-through or bypass (without heating or cooling).
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