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Shift strategies for mock continuously variable transmission

  • US 6,702,713 B2
  • Filed: 12/21/2001
  • Issued: 03/09/2004
  • Est. Priority Date: 12/21/2001
  • Status: Expired due to Term
First Claim
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1. An electromechanical transmission up-shift strategy for optimizing engine fuel economy of a motor vehicle, wherein an optimal fuel economy transmission gear ratio has been established for each ground speed of said vehicle for given actual engine speed and torque values, said strategy including the steps of:

  • a) selecting a next highest gear ratio, based upon a target up-shift engine speed, whenever said actual engine speed approaches a value above said target engine speed;

    b) continuing selections of successive next highest gear ratios based upon a series of higher target up-shift engine speeds in a manner that permits engagement of said next highest gear ratio whenever said actual engine speed approaches said higher value above said next successive higher target engine speed; and

    c) wherein said next gear ratio is calculated prior to each successive up-shift to provide optimal fuel economy.

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