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System for selecting between automatic and manual control of a number of gear ratios of a semiautomatic transmission

  • US 6,577,938 B1
  • Filed: 10/06/1997
  • Issued: 06/10/2003
  • Est. Priority Date: 10/06/1997
  • Status: Expired due to Term
First Claim
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1. A system for selecting between automatic and manual control of a number of gear ratios of a semiautomatic transmission, comprising:

  • an internal combustion engine coupled to a semiautomatic transmission having a number of manually selectable gear ratios and a number of automatically selectable gear ratios;

    means for determining an engine fueling rate;

    a switch having a first switch position and a second switch position;

    a memory unit including a software algorithm for controlling shifting between the number of automatically selectable gear ratios; and

    a control computer responsive to said first switch position to execute said software algorithm and thereby control shifting between the automatically selectable gear ratios, said control computer responsive to said second switch position to inhibit execution of said software algorithm such that said number of automatically selectable gear ratios are manually selectable if said engine is currently engaged with any of said number of automatically selectable gear ratios and said fueling rate is less than a threshold fueling rate.

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