METHODS AND SYSTEMS FOR HEATING TRANSMISSION FLUID
First Claim
1. A method for heating transmission fluid in a vehicle, the vehicle comprising an engine and a transmission, the engine including a heat exchanger, the method comprising,during a first engine running condition, operating an auxiliary transmission fluid pump to generate pressure in the transmission fluid and pump transmission fluid to the heat exchanger;
- andduring a second condition where the engine is not running, operating the auxiliary transmission fluid pump to generate pressure in the transmission fluid and pump transmission fluid to the heat exchanger.
1 Assignment
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Accused Products
Abstract
Systems and methods are provided for heating transmission fluid in a vehicle, the vehicle comprising an engine and a transmission, the engine including a heat exchanger. One example method comprises, during a first engine running condition, operating an auxiliary transmission fluid pump to generate pressure in the transmission fluid and pump transmission fluid to the heat exchanger, and during a second condition where the engine is not running, operating the auxiliary transmission fluid pump to generate pressure in the transmission fluid and pump transmission fluid to the heat exchanger.
38 Citations
18 Claims
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1. A method for heating transmission fluid in a vehicle, the vehicle comprising an engine and a transmission, the engine including a heat exchanger, the method comprising,
during a first engine running condition, operating an auxiliary transmission fluid pump to generate pressure in the transmission fluid and pump transmission fluid to the heat exchanger; - and
during a second condition where the engine is not running, operating the auxiliary transmission fluid pump to generate pressure in the transmission fluid and pump transmission fluid to the heat exchanger. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A vehicle system, comprising:
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an engine including an exhaust; an automatic transmission including an engine-driven fluid pump and an auxiliary fluid pump, the pumps configured to pump transmission fluid through the transmission; a heat exchanger in the engine exhaust; and a control system configured to, selectively shut-down the engine responsive to engine idle-stop conditions and without receiving an engine shutdown request from an operator, and restart the engine from the engine shut-down responsive to restart conditions; operate the auxiliary fluid pump to generate pressure in the transmission fluid and pump transmission fluid to the heat exchanger during a first engine running condition where the temperature of the transmission fluid is below a threshold; operate the auxiliary fluid pump to generate pressure in the transmission fluid and pump transmission fluid to the heat exchanger during a second condition where the engine is shut-down responsive to the engine idle-stop conditions; and operate the engine-driven fluid pump to generate pressure in the transmission fluid during a third engine running condition where the temperature of the transmission fluid is above the threshold. - View Dependent Claims (11, 12, 13)
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14. A method for heating transmission fluid in a vehicle, the vehicle comprising an engine and a transmission, the transmission including an engine-driven fluid pump and an auxiliary fluid pump, the engine including an exhaust and a heat exchanger coupled to the exhaust, the engine configured to be selectively shut-down responsive to engine idle-stop conditions and without receiving an engine shutdown request from an operator, the engine further configured to be restarted from shut-down responsive to restart conditions, the method comprising,
during a first engine running condition where the temperature of the transmission fluid is below a threshold, operating the auxiliary fluid pump to generate pressure in the transmission fluid and pump transmission fluid to the heat exchanger; -
during a second condition where the engine is not running, operating the auxiliary fluid pump to generate pressure in the transmission fluid and pump transmission fluid to the heat exchanger; and during a third engine running condition where the temperature of the transmission fluid is above a threshold, operating the engine-driven fluid pump to generate pressure in the transmission fluid. - View Dependent Claims (15, 16, 17, 18)
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Specification