Regulating transmission fluid and engine coolant temperatures in a motor vehicle

A technology for engine cooling, transmission oil, applied in the field of temperature devices, which can solve the problems of inability to cool heavy-duty applications, reduced heater performance, compromised passenger compartment heater performance, etc.

Inactive Publication Date: 2009-04-29
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While oil-to-water coolers in the engine coolant circuit provide a solution for light-duty vehicles, they cannot cool heavy-duty applications such as heavy-duty trucks and other tractors due to their higher coolant temperatures and The need to operate the transmission at temperatures close to the maximum engine coolant temperature
[0005] Additionally, the performance of the passenger compartment heater is compromised when engine coolant is used to heat the transmission
Heating the transmission creates lower coolant temperatures, reducing heater performance and slowing heat delivery to the passenger compartment

Method used

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  • Regulating transmission fluid and engine coolant temperatures in a motor vehicle

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Embodiment Construction

[0014] The automatic transmission 10 includes an oil pan 12 as a transmission oil source, from which transmission oil is supplied to an inlet side of a transmission pump (not shown), where the transmission oil is delivered from an oil passage of the transmission after lubrication , and remove heat from clutches, bearings, shafts, gears and other transmission components.

[0015] A first heat exchanger or oil-to-water heat exchanger 14 in communication with transmission oil source 12 via oil passage 16 is adapted to convey engine coolant and transfer heat between the engine coolant and transmission oil. The heat exchanger 14 includes a first inlet 18 through which transmission oil enters the heat exchanger 14 from the oil passage 16 and a first outlet 20 through which transmission oil exits the heat exchanger and enters the oil passage 22 .

[0016] The second heat exchanger auxiliary cooler 24 includes passages through which ambient air can flow, transferring heat between the ...

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Abstract

A system for controlling the temperature of a transmission fluid includes a first heat exchanger communicating with a source of engine coolant for transferring heat between the engine coolant and the transmission fluid and including a first outlet through which transmission fluid exits the first heat exchanger, a second heat exchanger through which air may flow for transferring heat between the transmission fluid and the air and including a second inlet through which transmission fluid enters the second heat exchanger, and second outlet through which transmission fluid exits the second heat exchanger, and a first bypass valve for alternately opening and closing the second inlet and the second outlet when a temperature of transmission fluid exiting the first outlet is greater than a first reference temperature, and for bypassing the second heat exchanger when the temperature of transmission fluid exiting the first outlet is less than the second reference temperature.

Description

technical field [0001] The present invention generally relates to devices for regulating the temperature of transmission oil and engine coolant in a motor vehicle. Background technique [0002] A transmission cooling system may include an oil-to-water cooler or an oil-to-air cooler, or both, that removes the heat contained in the transmission oil and is sized to accommodate the heat generated when the transmission operates under severe operating conditions. heat load. In order to reduce transmission friction, it is desirable to operate the transmission at relatively high temperatures. Higher temperatures reduce oil viscosity, which is a greater contribution to internal friction. [0003] A cooler bypass valve can be used to reduce heat transfer from the transmission oil when cooling is not desired so that internal friction can heat the transmission oil to the desired operating temperature. But the cooler bypass valve has a limited effect on the chances of warming up after...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60K11/00F01P11/00F16H57/04
CPCF01P7/165F16H57/0413F01P2060/045F01P2060/08F16H57/0417F01P3/20F01P11/08F16H57/0412
Inventor 詹姆士·T·古登布赖恩·D·比舍普格里高利·D·加德纳
Owner FORD GLOBAL TECH LLC
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