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Method for determining an amount of liquid removed from a tank and reducing agent supply device for a motor vehicle

  • US 9,765,668 B2
  • Filed: 07/13/2012
  • Issued: 09/19/2017
  • Est. Priority Date: 01/13/2010
  • Status: Active Grant
First Claim
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1. A method for controlling an amount of liquid removed from a tank per unit time, the method comprising the following steps:

  • discontinuously feeding the liquid removed from the tank through an injection line via a valve to exhaust gas of an internal combustion engine;

    setting and maintaining a substantially constant pressure in a temporary storage area in the injection line with a supply pump;

    simultaneously measuring time-dependent pressures at least at two respective points in the injection line with respective pressure sensors disposed at the at least two respective points in the injection line downstream of the temporary storage area; and

    determining, in a controller, an amount of the liquid supplied per unit time from the measured pressures, where the amount of liquid supplied per unit time is the amount of liquid removed from the tank per unit time, the liquid being urea dissolved in water;

    comparing the amount of liquid removed per unit time to predeterminable amounts in the controller and the controller controlling the valve for feeding the amount of liquid removed per unit time so that the amount matches a predetermined intended amount of liquid removed per unit time.

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