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Method for venting a tank

  • US 5,460,142 A
  • Filed: 06/10/1994
  • Issued: 10/24/1995
  • Est. Priority Date: 06/30/1993
  • Status: Expired due to Term
First Claim
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1. A method for controlling a tank-venting system utilized with an internal combustion engine having an intake pipe and a fuel tank which can suffer damage when pressure in the tank becomes signifcantly less than ambient pressure, the fuel tank being connected to the intake pipe via a line system equipped with a tank-venting valve, the method comprising the steps of:

  • providing a sensor for supplying a signal (PTact) as a measure of the pressure within the fuel tank;

    predetermining a threshold value for the pressure in the tank which is less than the ambient pressure; and

    ,adjusting the opening state of the tank-venting valve in dependence upon said pressure in said fuel tank to limit the flow of vapor volume therethrough so as to cause the pressure in the tank to remain greater than said threshold value thereby preventing said damage to said fuel tank.

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