Patent · US Active

Method for metering a reagent into an exhaust gas duct and device for carrying out the method

US8528390B2 · kind B2 · utility

2Cited by

3References

10Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Dirk von Meduna · Stuttgart, DE
Matthias Kruse · San Francisco, US
Matthias Burger · Bad Birnbach, DE
Franz-Josef Trompeter · Aachen, DE
Markus Buerglin · Ditzingen, DE

Key dates

Filing date	Jul 13, 2011
Grant date	Sep 10, 2013
Priority date	—
Expiry date	Mar 8, 2032

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02T10/12
WIPO fieldEnvironmental technology
WIPO sectorChemistry

Abstract

The invention proposes a method for metering a reagent, in which the reagent is sprayed into a spray tube (12) via an electrically activated metering valve (24), and is mixed in the spray tube (12) with compressed air, and in which the reagent mixed with compressed air is introduced by means of the spray tube (12) into an exhaust gas duct (10) and is atomized, and a device for carrying out the method. The procedure according to the invention is distinguished in that the duration of the metering valve activation signal (34) is corrected depending on the differential pressure between the hydraulic pressure (p_Rea_hyd) of the reagent in the metering valve (24) and the pneumatic pressure (p_D_pneu) in the spray tube (12). The procedure according to the invention permits a high degree of accuracy in the metering of the reagent.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.