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Method for altitude-compensated transmission shift scheduling

  • US 8,224,539 B2
  • Filed: 10/15/2008
  • Issued: 07/17/2012
  • Est. Priority Date: 11/02/2007
  • Status: Expired due to Fees
First Claim
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1. Method for controlling a vehicular powertrain system including an engine coupled to a transmission operative in one of a plurality of fixed gear and continuously variable operating range states to transfer power between the engine and an output member, the method comprising:

  • monitoring an operator torque request;

    monitoring barometric pressure and engine input speed to the transmission;

    determining an achievable range of input power transferable from the engine to the transmission based upon the barometric pressure and the engine input speed; and

    selecting a preferred one of the operating range states for the transmission and a preferred engine operating point at the preferred operating range state based upon the operator torque request and the achievable range of input power.

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