×

METHOD AND APPARATUS TO CONTROL HYDRAULIC LINE PRESSURE IN AN ELECTRO-MECHANICAL TRANSMISSION

  • US 20090112421A1
  • Filed: 10/10/2008
  • Published: 04/30/2009
  • Est. Priority Date: 10/26/2007
  • Status: Active Grant
First Claim
Patent Images

1. Method for controlling hydraulic line pressure of a hydraulic control system in an electromechanical transmission adapted to selectively transmit mechanical power to an output member, said method comprising:

  • determining an available flow from a main hydraulic pump;

    determining an available flow from an auxiliary hydraulic pump;

    determining a flow consumption of functions served by said hydraulic control system;

    determining an estimated hydraulic line pressure based upon said flow from said main hydraulic pump, said flow from said auxiliary hydraulic pump, and said flow consumption;

    determining a desired hydraulic line pressure to fulfill the functions served by said hydraulic control system;

    comparing said desired hydraulic line pressure to said estimated hydraulic line pressure; and

    controlling said main hydraulic pump and said auxiliary hydraulic pump based upon said comparing said desired hydraulic line pressure to said estimated hydraulic line pressure.

View all claims
  • 17 Assignments
Timeline View
Assignment View
    ×
    ×