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Self-diagnostic apparatus of vehicles

  • US 5,388,045 A
  • Filed: 08/26/1993
  • Issued: 02/07/1995
  • Est. Priority Date: 08/27/1992
  • Status: Expired due to Term
First Claim
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1. A self-diagnostic apparatus for a vehicle comprising:

  • data detection means for detecting diagnostic data concerning an operation parameter of at least one device in said vehicle;

    diagnostic data storage means for updating and storing said diagnostic data and for maintaining said stored diagnostic data even when an ignition switch of said vehicle is turned off;

    updating period changing means for changing a time period of updating by said diagnostic data storage means, and for detecting a rate of change of said diagnostic data, said time period being changed to update data stored in said diagnostic data storage means at an updating time period which decreases as said detected rate of change increases;

    abnormality detection means for detecting an abnormal operating state in accordance with said diagnostic data of said device; and

    inhibition means for inhibiting said diagnostic data from being updated after said abnormal operating state is detected.

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