Engine and transmission temperature control system
First Claim
1. A vehicle comprising:
- a transmission;
a transmission oil cooler configured to transfer heat between Automatic Transmission Fluid (ATF) and engine coolant;
a transmission fluid circuit configured to convey ATF from the transmission, through the transmission oil cooler, back to the transmission;
an engine;
a pump having an outlet and an inlet;
a primary radiator;
an auxiliary radiator;
a first engine coolant circuit from the pump outlet, through the engine and the primary radiator, to the pump inlet; and
a second engine coolant circuit from the pump outlet, through the auxiliary radiator and the transmission oil cooler, to the pump inlet.
1 Assignment
0 Petitions
Accused Products
Abstract
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.
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Citations
15 Claims
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1. A vehicle comprising:
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a transmission; a transmission oil cooler configured to transfer heat between Automatic Transmission Fluid (ATF) and engine coolant; a transmission fluid circuit configured to convey ATF from the transmission, through the transmission oil cooler, back to the transmission; an engine; a pump having an outlet and an inlet; a primary radiator; an auxiliary radiator; a first engine coolant circuit from the pump outlet, through the engine and the primary radiator, to the pump inlet; and a second engine coolant circuit from the pump outlet, through the auxiliary radiator and the transmission oil cooler, to the pump inlet. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A cooling system comprising:
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a pump having an outlet and an inlet; a first engine coolant circuit from the pump outlet, through an engine and a primary radiator, to the pump inlet; and a second engine coolant circuit from the pump outlet, through a transmission oil cooler, to the pump inlet, the second engine coolant circuit including a control valve to selectively divert coolant through an auxiliary radiator based on a fluid temperature. - View Dependent Claims (9, 10, 11, 12)
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13. A method of regulating coolant and transmission temperatures comprising:
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routing Automatic Transmission Fluid (ATF) through a transmission oil cooler; pumping engine coolant at a flow rate; routing a first fraction of the flow rate through an engine and a primary radiator; and routing a second fraction of the flow rate through an auxiliary radiator and the transmission oil cooler. - View Dependent Claims (14, 15)
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Specification