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Tank-venting system for a motor vehicle and method for checking the operability thereof

  • US 5,193,512 A
  • Filed: 10/08/1991
  • Issued: 03/16/1993
  • Est. Priority Date: 02/08/1990
  • Status: Expired due to Term
First Claim
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1. A tank-venting arrangement for a motor vehicle having an internal combustion engine equipped with an intake pipe, the arrangement comprising:

  • a fuel tank;

    an adsorption filter;

    a filter line connecting said fuel tank to said adsorption filter;

    a venting line connected to said adsorption filter;

    a controllable shut-off valve arranged in said venting line;

    a valve line connecting said adsorption filter to said intake pipe;

    a tank-venting valve mounted in said valve line for closing and opening said valve line to said intake pipe;

    control means for closing said shut-off valve and for opening said tank-venting valve; and

    ,measuring means for measuring whether underpressure builds up in said tank when said shut-off valve is closed and said tank-venting valve is opened thereby enabling a conclusion to be made that said arrangement is operative.

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