Patent · US Active

Metering device for liquid reducing agent

US8225598B2 · kind B2 · utility

14Cited by

5References

17Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Rainer Haeberer · Bretten, DE
Matthias Horn · Tettnang, DE
Hartmut Lueders · Oberstenfeld, DE
Leopold Bernegger · Adnet, AT

Key dates

Filing date	Nov 15, 2007
Grant date	Jul 24, 2012
Priority date	—
Expiry date	Nov 22, 2027

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02T10/40
WIPO fieldEnvironmental technology
WIPO sectorChemistry

Abstract

A metering device for introducing liquid reducing agent into an exhaust gas pipe. A metering valve is supplied with contents from a working tank by a delivery unit and dispenses the tank contents in a discharge direction. The delivery unit establishes a negative pressure between the delivery unit and the metering valve when the delivery direction is reversed. The negative pressure causes gas to be drawn off through the metering valve against the discharge direction. The delivery direction is reversed by either a feed pump with a reversible effective direction or a feed pump and a repolarization valve which communicates with the feed pump and transposes an inlet and an outlet of the feed pump.

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