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METHOD FOR CONTROLLING EXHAUST GAS HEAT RECOVERY SYSTEMS IN VEHICLES

  • US 20120143437A1
  • Filed: 12/01/2010
  • Published: 06/07/2012
  • Est. Priority Date: 12/01/2010
  • Status: Active Grant
First Claim
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1. A method of operating a vehicle including an engine, a transmission, an exhaust gas heat recovery (EGHR) heat exchanger, and an oil-to-water heat exchanger providing selective heat-exchange communication between the engine and transmission, the method comprising:

  • controlling a two-way valve, wherein the two-way valve is configured to be set to one of an engine position and a transmission position, wherein the engine position allows heat-exchange communication between the EGHR heat exchanger and the engine and does not allow heat-exchange communication between the EGHR heat exchanger and the oil-to-water heat exchanger, and the transmission position allows heat-exchange communication between the EGHR heat exchanger, the oil-to-water heat exchanger, and the engine;

    monitoring an ambient air temperature;

    comparing the monitored ambient air temperature to a predetermined cold ambient temperature; and

    if the monitored ambient air temperature is greater than the predetermined cold ambient temperature, setting the two-way valve to the transmission position.

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