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Shift control system for automatic transmission

  • US 20030064855A1
  • Filed: 09/05/2002
  • Published: 04/03/2003
  • Est. Priority Date: 09/07/2001
  • Status: Active Grant
First Claim
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1. A shift control system for a vehicle automatic transmission, comprising:

  • a vehicle speed sensor for detecting a vehicle speed;

    a first control means for normally performing a shift control of the transmission so that a target speed ratio of the transmission is achieved, said target speed ratio being determined based at least on a vehicle speed detected by the vehicle speed sensor; and

    a second control means for performing a shift control of the transmission when the vehicle speed sensor is in trouble, by generating a command for holding or changing a current speed ratio based at least on an input rotation speed of the transmission.

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