Patent attributes
A transmission oil cooler transfers heat between Automatic Transmission Fluid (ATF) and engine coolant. During initial vehicle warm-up, heat is transferred from the engine coolant to the ATF, assisting the transmission warm-up. A priority valve may limit the flow of coolant to the transmission oil cooler until the coolant temperature is sufficient to ensure adequate cabin heating performance. After both the engine and transmission have reached normal operating temperatures, heat is transferred from the ATF to the engine coolant. An auxiliary radiator pre-cools the engine coolant before it enters transmission oil cooler. This increases the cooling of the ATF and avoids coolant temperature increase during aggressive maneuvers. When the ATF temperature is below a threshold, a coolant control valve diverts coolant around the auxiliary radiator.
