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Thermal management unit for vehicle powertrain

  • US 10,087,793 B2
  • Filed: 01/26/2015
  • Issued: 10/02/2018
  • Est. Priority Date: 01/26/2015
  • Status: Active Grant
First Claim
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1. A thermal management unit for a vehicle powertrain, comprising:

  • a control valve operable to selectively route fluid between a valve outlet and first and second valve inlets;

    a first fluid port to receive a flow of oil from the vehicle powertrain;

    a second fluid port to deliver a flow of oil to the vehicle powertrain;

    a third fluid port fluidly connected to the first fluid port by way of a first flow path extending through the thermal management unit;

    a fourth fluid port fluidly connected to one of the first and second valve inlets by way of a second flow path extending through the thermal management unit;

    an integrated transmission oil heater having a fluid inlet manifold, a fluid outlet manifold, and a plurality of flow structures extending between the fluid inlet manifold and the fluid outlet manifold, wherein the fluid inlet manifold is fluidly connected to the first fluid port by way of a third flow path extending through the thermal management unit and the fluid outlet manifold is fluidly connected to the other of the first and second valve inlets by way of a fourth flow path extending through the thermal management unit;

    a fifth flow path extending between and fluidly connecting the second fluid port and the valve outlet;

    a shunt flow path extending from the first fluid port and fluidly connecting to the control valve; and

    a pressure relief valve arranged along the shunt flow path to block the flow of oil along the shunt flow path when the pressure differential between the first fluid port and the end of the shunt flow path is below a threshold, and to allow flow of oil along the shunt flow path when said pressure differential exceeds said threshold.

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