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METHOD AND APPARATUS TO CONTROL OPERATION OF A HYDRAULIC CONTROL CIRCUIT FOR AN ELECTRO-MECHANICAL TRANSMISSION

  • US 20080103003A1
  • Filed: 10/26/2006
  • Published: 05/01/2008
  • Est. Priority Date: 10/26/2006
  • Status: Active Grant
First Claim
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1. Method to control an electro-mechanical transmission comprising first and second electrical machines and a hydraulic circuit comprising a plurality of pressure control devices and flow management valves, the method comprising:

  • monitoring an operating temperature of the electrical machines;

    determining a cooling flow rate in the hydraulic circuit effective to reduce the operating temperature of the electrical machines;

    determining availability of active cooling for each of the electrical machines; and

    selectively controlling hydraulic flow in the hydraulic circuit.

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