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Diagnostic apparatus for continuously variable transmission

  • US 4,698,764 A
  • Filed: 01/24/1985
  • Issued: 10/06/1987
  • Est. Priority Date: 01/26/1984
  • Status: Expired due to Term
First Claim
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1. In an automatic vehicle having (a) a continuously variable transmission for transmitting the output of an engine to drive wheels at a steplessly variable speed ratio, (b) a control system operable to determine a target speed ratio of the transmission, and (c) a shift-regulating device responsive to the control system to control the speed ratio of the transmission so that an actual speed ratio of the transmission coincides with said target speed ratio, a diagnostic apparatus for checking whether the speed ratio of said transmission is normally controlled, said diagnostic apparatus comprising:

  • detecting means for detecting said actual speed ratio of said transmission;

    calculating means for determining a difference between said target speed ratio and said actual speed ratio of the transmission;

    memory means storing data for determining a normal range of said difference between said target speed ratio and said actual speed ratio of the transmission; and

    judging means for checking whether or not the determined difference falls within said normal range.

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