Exhaust gas subsequent treatment method and method therefor
AssigneeRobert Bosch GmbH
InventorBuelent Barcin
Life of this patent
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Abstract
A method and device for treating exhaust gases of an internal combustion engine with a reducing agent introduced into the exhaust gases. The reducing agent is pumped out of a reactant reservoir and to a dosing valve so that after the dosing valve is opened, the reducing agent can be introduced into the engine's exhaust gas line in a dosed manner. Reducing agent can be conveyed back from the delivery device to the reservoir via a return line. The reducing agent can circulate between the delivery device and the reactant reservoir thereby, particularly when the dosing valve is closed, preventing the reactant from freezing.
Claims21
1-11. (canceled)
A method for aftertreatment of exhaust gases of an internal combustion engine through the use of a reactant to be introduced into the exhaust, in particular a reducing agent, the method comprising pumping the reactant by means of a supply pump from a reactant reservoir to a metering valve so that after the opening of the metering valve, the reactant can be introduced in a metered fashion into an exhaust line of the engine and reactant can be returned from the supply device to the reactant reservoir via a return line, and circulating the reactant between the supply device and the reactant reservoir in such a way that particularly when the metering device is closed, the reactant is prevented from freezing.
Dependencies are inferred from the claim text.