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Method and apparatus to control motor cooling in an electro-mechanical transmission

  • US 8,500,598 B2
  • Filed: 03/29/2012
  • Issued: 08/06/2013
  • Est. Priority Date: 10/26/2007
  • Status: Active Grant
First Claim
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1. Apparatus for controlling a powertrain comprising an electro-mechanical transmission mechanically-operatively coupled to an internal combustion engine and first and second electric machines adapted to selectively transmit mechanical power to an output member, said apparatus comprising:

  • said first and second electric machines;

    a first electric machine cooling circuit directing a cooling hydraulic flow to said first electric machine comprisinga first hydraulic circuit providing a first electric machine base cooling flow to said first electric machine, anda second hydraulic circuit selectively providing a first electric machine active cooling flow to said first electric machine;

    a second electric machine cooling circuit directing a cooling hydraulic flow to said second electric machine comprisinga third hydraulic circuit providing a second electric machine base cooling flow to said second electric machine, anda fourth hydraulic circuit selectively providing a second electric machine active cooling flow to said second electric machine;

    a hydraulic control system receiving a hydraulic flow and selectively channeling said hydraulic flow to said first and second electric machine cooling circuits; and

    an active electric machine cooling control system monitoring temperatures of said first and second electric machines, monitoring operation of said hydraulic control system, and selectively controlling said hydraulic control system.

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