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Rear axle lubrication oil temperature control using exhaust heat recovery and a thermal battery

  • US 10,408,333 B2
  • Filed: 12/09/2015
  • Issued: 09/10/2019
  • Est. Priority Date: 12/09/2015
  • Status: Active Grant
First Claim
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1. A method, comprising;

  • responsive to a first condition, where the first condition includes a rear axle lubrication oil temperature that is above a threshold temperature and a thermal battery system outlet temperature that is less than an exhaust gas heat exchanger outlet temperature, recovering exhaust gas heat at an exhaust gas heat exchanger via coolant in a coolant loop and storing the recovered exhaust gas heat in a thermal battery system via the coolant; and

    responsive to a second condition, where the rear axle lubrication oil temperature is below the threshold temperature in the second condition, transferring heat from the thermal battery system to rear axle lubrication oil via the coolant at a rear-axle heat exchanger, wherein the coolant in the coolant loop is maintained separate from engine coolant in an engine coolant system.

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