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Method for identifying an operating state of an engine soak timer

  • US 6,718,256 B1
  • Filed: 10/04/2001
  • Issued: 04/06/2004
  • Est. Priority Date: 10/04/2001
  • Status: Active Grant
First Claim
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1. A method for use by a vehicle control assembly of the type having a soak timer and adapted for use in combination with an internal combustion engine, said method being effective to ascertain the existence of a short time state within the soak timer, said method comprising the steps of determining whether the engine has been recently activated;

  • creating a cooling signature for a certain material;

    measuring the temperature of said certain material at a first time;

    inferring the temperature of said certain material at a second time by use of said cooling signature;

    comparing said measured temperature and said inferred temperature; and

    identifying the existence of said short time state by use of said comparison.

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