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METHOD AND CONTROL ARCHITECTURE TO DETERMINE MOTOR TORQUE SPLIT IN FIXED GEAR OPERATION FOR A HYBRID POWERTRAIN SYSTEM

  • US 20090115349A1
  • Filed: 10/13/2008
  • Published: 05/07/2009
  • Est. Priority Date: 11/07/2007
  • Status: Active Grant
First Claim
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1. Method for operating an electro-mechanical transmission operative to transmit mechanical torque originating from an engine and first and second electric machines to an output member, the electric machines electrically-operatively connected to an energy storage system for electrical power flow therebetween, the method comprising:

  • operating the electro-mechanical transmission in a fixed gear operating range state;

    determining a minimum power flow between the energy storage system and the first and second electric machines to meet an operator torque request based upon electrical power constraints and motor torque constraints;

    commanding a motor torque from the first electric machine based upon the minimum power flow; and

    commanding a motor torque from the second electric machine based upon the minimum power flow, a torque input from the engine and the commanded motor torque from the first electric machine to meet the operator torque request in the fixed gear operating range state.

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