DOSING SYSTEM FOR USE IN AN EXHAUST SYSTEM OF A COMBUSTION ENGINE
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United States of America Patent
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Issued Date -
Dec 29, 2011
app pub date -
Jul 6, 2009
filing date -
Jul 7, 2008
priority date (Note) -
Abandoned
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Abstract
The present invention relates to a dosing system for dosing a first fluid, preferably flowing in a first flow passage (5) into a stream of a second fluid, preferably flowing in a second flow passage (9). The system may e.g. be used to dose a reducing agent into an exhaust gas from a combustion engine (1). The system comprises a valve (6), a nozzle (3) having an outlet arranged downstream of the valve (6), a flow passage (5) through which the first fluid can flow from a reservoir (4) to the nozzle outlet via the valve (6), and a control system (7) adapted to receive input from one or more sensors (8) and based thereon determine a request value based on which a valve opening period is determined. The valve opening period is different from zero and independent on the request value when the request value is below a predefined threshold value. The invention further relates to an exhaust system comprising such a dosing system and to a method of dosing a first fluid into a stream of a second fluid by use of such a dosing system.
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