Transmission Fluid Warming and Cooling Method
First Claim
1. A method for controlling the temperature of transmission fluid in a motor vehicle having an engine and a transmission comprising:
- operating in a heater priority mode by disabling automatic transmission fluid heating;
determining when to enter an automatic transmission fluid heating mode by determining when any one of a group of conditions has been met wherein entering an automatic transmission fluid heating mode occurs after the heater priority mode and only when any one of the group of conditions has been met; and
entering the automatic transmission fluid heating mode by sending hot engine coolant to the heat exchanger for heating the automatic transmission fluid by transferring heat from the hot engine coolant to the automatic transmission fluid.
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Accused Products
Abstract
A method for controlling the temperature of transmission fluid in a motor vehicle includes operating in an automatic transmission fluid cooling mode, a heater priority mode entered by disabling automatic transmission fluid heating, and an automatic transmission fluid heating mode which includes sending hot engine coolant to a heat exchanger for heating the automatic transmission fluid by transferring heat from the hot engine coolant to the automatic transmission fluid. The method switches to from a heater priority mode to a transmission heating mode base on a number of sensed conditions including sensed automatic fluid transmission temperature. The method also includes an automatic transmission fluid temperature regulating mode including measuring an automatic transmission fluid temperature and switching between the cooling mode and the heating mode based measured temperature.
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Citations
26 Claims
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1. A method for controlling the temperature of transmission fluid in a motor vehicle having an engine and a transmission comprising:
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operating in a heater priority mode by disabling automatic transmission fluid heating; determining when to enter an automatic transmission fluid heating mode by determining when any one of a group of conditions has been met wherein entering an automatic transmission fluid heating mode occurs after the heater priority mode and only when any one of the group of conditions has been met; and entering the automatic transmission fluid heating mode by sending hot engine coolant to the heat exchanger for heating the automatic transmission fluid by transferring heat from the hot engine coolant to the automatic transmission fluid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method of regulating a temperature of transmission fluid in a motor vehicle transmission by:
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directing hot engine coolant from an engine to a heat exchanger; entering a heating mode by heating the automatic transmission fluid by transferring heat from the hot engine coolant to the automatic transmission fluid by using the heat exchanger; directing cold engine coolant from a radiator to the heat exchanger; entering a cooling mode by cooling the automatic transmission fluid by transferring heat from the automatic transmission fluid to the cold engine coolant by using the heat exchanger; measuring a sump temperature of the automatic transmission fluid in the sump of the automatic transmission; measuring a case out temperature of the automatic transmission fluid as the automatic transmission leaves the automatic transmission; entering the cooling mode when the sump temperature exceeds a first high set value or the case out temperature exceeds a second high set value; and entering the heating mode when either the sump temperature drops below a first low set value and the case out temperature drops below a second low set value. - View Dependent Claims (25, 26)
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Specification