Appeal 2006-3268
Application 10/479,696
INTRODUCTION
Appellant invented a device and method for metering a reducing
agent, particularly urea or a urea-water solution as a catalytic exhaust gas
treatment (Specification 1). The device includes a metering device attached
at an end of a reducing agent line (Claim 13). The metering device has a
pressure recording element coupled to an output side of the metering device
(Claim 13). The pressure recording element may be either pneumatic or
electric (Figure 1, ref. no. 13; Figure 2, ref. no. 70). The pressure recording
element controls a relief valve (Figures 1 and 2, ref. no. 11) to determine the
proper pressure and amount of urea to supply to the input side of the
metering device so that the pressure drop across the metering device is
constant (Specification 3: 14-18; 5: 8-12). Claims 13, 20, 21, 22, 25, and 26
are illustrative:
13. A device for metering a reducing agent comprising:
means for supplying the reducing agent into a catalytic
converter system via a line for removing nitrogen oxides from exhaust gases;
a metering device situated at an end of the line;
a pressure recording element recording pressure changes at an
output side of the metering device facing away from the line; and
means for regulating a pressure of the reducing agent in the
line, the means for regulating being adapted to interact with the pressure
recording element, so that the pressure changes have an influence on the
pressure regulation.
20. The device according to claim 19, wherein the relief valve has a
pneumatic connection, the pressure recording element has an additional line
2
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Last modified: September 9, 2013