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US 7,017,335 B2Granted
Method and device for dosing a reducing agent for the removal of nitrogen oxides from exhaust gases
AssigneeRobert Bosch GmbH
InventorsSven Huber, Hanspeter Mayer, Gerhard Mueller, Michael Offenhuber
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Abstract
A method and a device for metering a reducing agent is described, which is used for mass regulated metering of a reducing agent, in particular urea or a urea-water solution for the exhaust gas treatment of the exhaust gas of a diesel engine in particular. The device includes a mass sensor for measuring the reducing agent mass flow into the catalytic converter system.
Claims21
A method of metering a reducing agent, comprising:
- supplying the reducing agent to a catalytic converter system for removing a nitrogen oxide from an exhaust gas;
- measuring a mass flow of the reducing agent;
- metering the reducing agent as a function of a magnitude of the mass flow;
- measuring a density of the reducing agent prior to being supplied to the catalytic converter system;
- determining a physical state of the reducing agent from the density measured;
- and
- one of degassing and heating the reducing agent if one of a gaseous phase and a solid phase is present.
4 more elements
A device for metering a reducing agent, comprising:
- an arrangement for supplying the reducing agent to a catalytic converter system for removing a nitrogen oxide from the exhaust gas;
- at least one actuator;
- and
- a mass sensor for measuring a mass flow of the reducing agent into the catalytic converter system and being situated downstream from the arrangement for supplying the reducing agent, so that a mass regulated metering of the reducing agent may take place as a function of an electrical signal of the mass sensor via the at least one actuator, the mass sensor being capable of measuring a density of the reducing agent so that a physical state of the reducing agent may be determined from the density measured, and the reducing agent may be one of degassed and heated in the event of a presence of one of a gaseous phase and a solid phase.
1 more element
Dependencies are inferred from the claim text.