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Coolant control systems and methods for warming engine oil and transmission fluid

  • US 9,581,075 B2
  • Filed: 03/14/2013
  • Issued: 02/28/2017
  • Est. Priority Date: 03/14/2013
  • Status: Active Grant
First Claim
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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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