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METHOD AND APPARATUS TO CONTROL LOGIC VALVES FOR HYDRAULIC FLOW CONTROL IN AN ELECTRO-MECHANICAL TRANSMISSION

  • US 20090112422A1
  • Filed: 10/10/2008
  • Published: 04/30/2009
  • Est. Priority Date: 10/26/2007
  • Status: Active Grant
First Claim
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1. Method for controlling an electromechanical transmission comprising first and second electric machines and a hydraulic circuit having a plurality of flow management valves and pressure control solenoids operative to actuate a plurality of clutches and a plurality of pressure monitoring devices adapted to monitor said hydraulic circuit, said transmission operative in fixed gear and continuously variable operating range states through selective actuation of said clutches, the method comprising:

  • monitoring a current hydraulic circuit oil temperature;

    monitoring a current state of said flow management valves;

    monitoring a command for cooling of said electric machines;

    monitoring a desired transmission operating range state;

    utilizing a state machine to determine a sequence for controlling positions of said flow management valves to achieve said desired transmission operating range state based upon said current hydraulic circuit oil temperature, said current state of said flow management valves, said command for cooling of said electric machines, and said desired transmission operating range state; and

    controlling said flow management valves based upon said sequence.

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