Dosing system for reduction agent
The present invention relates to a dosing system (20) for adding a reducing agent to an exhaust gas flow from an internal combustion engine (2) and comprises a storage tank (21) for the reducing agent, a pressurizing supply pump (23) arranged downstream of the tank (21) for supplying the reducing ag...
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Format: | Patent |
Sprache: | eng |
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Zusammenfassung: | The present invention relates to a dosing system (20) for adding a reducing agent to an exhaust gas flow from an internal combustion engine (2) and comprises a storage tank (21) for the reducing agent, a pressurizing supply pump (23) arranged downstream of the tank (21) for supplying the reducing agent via at least a first filter device (26) to a first dosing unit (22) and to a second dosing unit (24), each dosing unit (22; 24) comprising a respective dispensing device (220, 240) for the reducing agent, the first and second dosing units (22; 24) being arranged in series and the first filter device (26) being arranged upstream of the first dosing unit (22). A bypass pipe (28) comprising a flow obstruction device (280) is arranged to connect a supply pipe (31) from the supply pump (23) upstream of the first filterdevice (26) with an intermediate pipe (32) between the first dosing unit (22) and the second dosing unit (24) and at least a portion of the reducing agent flow is arranged to by-pass the first filter device (26) and the first dosing unit (22) via the by-pass pipe (28) in case the first filter device (26) is at least partly clogged. The dosing system is preferably included in the exhaust system (10) of a vehicle (1). |
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