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Tank-venting arrangement and method of operating the same

  • US 5,197,442 A
  • Filed: 12/20/1991
  • Issued: 03/30/1993
  • Est. Priority Date: 12/20/1990
  • Status: Expired due to Fees
First Claim
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1. A method for operating a tank-venting arrangement on a motor vehicle having an engine, the tank-venting arrangement including a tank having a tank closure, an adsorption filter and check valve interconnecting the tank and the adsorption filter, the method comprising the steps of:

  • measuring the pressure difference between the pressure in the tank and the ambient pressure at least when the engine is running;

    keeping the check valve closed to maintain an overpressure in the tank in a predetermined interval during running of the internal combustion engine when no indication is present that the tank may be opened;

    opening the check valve when one of the following occurs;

    the pressure difference increases beyond an upper thereshold valve and an indication is present that the tank may be opened; and

    ,closing the check valve when one of the following occurs;

    the pressure difference drops below a lower threshold value and an indication is present that the tank may be closed.

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