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Apparatus and method for controlling a speed change of an automatic transmission

  • US 6,216,073 B1
  • Filed: 04/10/1998
  • Issued: 04/10/2001
  • Est. Priority Date: 04/25/1997
  • Status: Expired due to Term
First Claim
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1. A speed change control apparatus for an automatic transmission comprising:

  • running resistance calculation means for calculating a vehicle running resistance;

    drive force calculation means for calculating a drive force;

    down-shift requirement outputting means for outputting a down-shift requirement when said running resistance is greater than the sum of said drive force and a threshold value;

    accelerator opening detecting means for detecting an accelerator opening;

    judgement level setting means for setting a judgement level of said accelerator opening higher as the accelerator opening increases;

    down-shift requirement cancellation means for canceling said down-shift requirement output from said down-shift requirement output means, when said accelerator opening detected by said accelerator opening detecting means is smaller than said judgement level; and

    down-shift control means for carrying out a down-shift based on said down-shift requirement.

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