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Tank internal pressure-detecting device for internal combustion engines

  • US RE35,054 E
  • Filed: 07/05/1994
  • Issued: 10/10/1995
  • Est. Priority Date: 01/20/1992
  • Status: Expired due to Term
First Claim
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1. A tank internal pressure-detecting device for an internal combustion engine having a fuel tank, an intake system, and an evaporative emission control system for controlling purging of evaporative fuel generated in said fuel tank into the intake system, comprising:

  • tank internal pressure-detecting means arranged in said fuel tank for detecting pressure within said fuel tank;

    purging interrupting means for interrupting purging of said evaporative fuel by said evaporative emission control system for a predetermined period of time after said engine is started;

    opening means for opening an interior of said fuel tank to the atmosphere;

    memory means for storing a value of said pressure within said fuel tank detected by said tank internal pressure-detecting means as a reference value while said purging interrupting means is interrupting said purging of said evaporative fuel into said intake system and at the same time said opening means opens said interior of said fuel tank to the atmosphere; and

    correcting means for correcting an output value of said tank internal pressure-detecting means, based upon said reference value stored in said memory means.

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