Coolant control systems and methods for warming engine oil and transmission fluid
First Claim
1. A coolant control system of a vehicle, comprising:
- a target pressure module that determines a target pressure of coolant in a first coolant path from a thermostat valve to at least one of an engine oil heat exchanger and a transmission fluid heat exchanger; and
a thermostat valve control module that;
when a temperature of coolant within the engine is less than a predetermined temperature, closes the thermostat valve, thereby blocking coolant flow out of an engine, blocking coolant flow out of the thermostat valve to the first coolant path, and blocking coolant flow to a second coolant path from the thermostat valve to a radiator;
when the temperature is greater than the predetermined temperature;
at a first time, actuates the thermostat valve to open the thermostat valve to the first coolant path based on the target pressure and to block coolant flow to the second coolant path from the thermostat valve to the radiator; and
at a second time, after the first time, opens the thermostat valve to the second coolant path from the thermostat valve to the radiator.
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Accused Products
Abstract
A coolant control system of a vehicle includes a target pressure module and a thermostat valve control module. The target pressure module determines a target pressure of coolant in a coolant path between a thermostat valve and at least one of an engine oil heat exchanger and a transmission fluid heat exchanger. The thermostat valve control module closes the thermostat valve and blocks coolant flow out of an engine when a temperature of coolant within the engine is less than a predetermined temperature. When the temperature is greater than the predetermined temperature, the thermostat valve control module controls opening of the thermostat valve to the coolant path based on the target pressure.
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Citations
20 Claims
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1. A coolant control system of a vehicle, comprising:
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a target pressure module that determines a target pressure of coolant in a first coolant path from a thermostat valve to at least one of an engine oil heat exchanger and a transmission fluid heat exchanger; and a thermostat valve control module that; when a temperature of coolant within the engine is less than a predetermined temperature, closes the thermostat valve, thereby blocking coolant flow out of an engine, blocking coolant flow out of the thermostat valve to the first coolant path, and blocking coolant flow to a second coolant path from the thermostat valve to a radiator; when the temperature is greater than the predetermined temperature; at a first time, actuates the thermostat valve to open the thermostat valve to the first coolant path based on the target pressure and to block coolant flow to the second coolant path from the thermostat valve to the radiator; and at a second time, after the first time, opens the thermostat valve to the second coolant path from the thermostat valve to the radiator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A coolant control method for a vehicle, comprising:
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determining a target pressure of coolant in first coolant path from a thermostat valve to at least one of an engine oil heat exchanger and a transmission fluid heat exchanger; when a temperature of coolant within the engine is less than a predetermined temperature, closing the thermostat valve, thereby blocking coolant flow out of an engine, blocking coolant flow out of the thermostat valve to the first coolant path, and blocking coolant flow to a second coolant path from the thermostat valve to a radiator; and
,when the temperature is greater than the predetermined temperature; at a first time, actuating the thermostat valve to open the thermostat valve to the first coolant path based on the target pressure and to continue blocking coolant flow to the second coolant path from the thermostat valve to the radiator; and at a second time, after the first time, opening the thermostat valve to the second coolant path from the thermostat valve to the radiator. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification