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Method and system of controlling shift of transmission speed ratio for gas turbine engine vehicle

  • US 5,233,888 A
  • Filed: 06/04/1991
  • Issued: 08/10/1993
  • Est. Priority Date: 06/06/1990
  • Status: Expired due to Fees
First Claim
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1. A method for controlling a shift of a transmission speed ratio in an automatic power transmission employed in a gas turbine engine vehicle having a two-shaft type gas turbine engine including a gas generator constituted by a compressor and a compressor turbine arranged coaxially with said compressor, a combustion chamber, a variable nozzle, and a power turbine rotatable about a turbine shaft independently of a shaft of said compressor and said compressor turbine, wherein the method comprises the steps of:

  • detecting a steady state of said engine;

    detecting an acceleration of the engine;

    determining whether an engine accelerating condition satisfies a predetermined condition, wherein said predetermined condition is a requirement for a degree of acceleration from the steady state at more than a predetermined value;

    shifting a transmission speed ratio to a stage higher than a current transmission speed ratio when an acceleration condition satisfying said predetermined condition is detected; and

    selecting shift characteristics of said automatic power transmission so that as high a rotational range of said power turbine as possible is used when the requirement for a degree of acceleration from the steady state is less than said predetermined value.

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