Reagent dosing system and method of dosing reagent

Patent metadata

Field	Value
Publication number	US-10107164-B2
Application number	US-201615006608-A
Country	US
Kind code	B2
Filing date	Jan 26, 2016
Priority date	Jun 6, 2008
Publication date	Oct 23, 2018
Grant date	Oct 23, 2018

Abstract

A reagent dosing system for dosing a reagent into the exhaust gas stream of an internal combustion engine includes a reagent tank for storing a supply of reagent; an injector module including an atomizing dispenser and a positive-displacement metering pump which draws reagent from the reagent tank and delivers it to the dispenser; a supply line coupling the reagent tank to the injector module; a dosing control unit operable to control the injector module to inject reagent into the exhaust gas stream; and an additional priming pump arranged, in use, to urge reagent along the supply line toward the injector module under selected conditions.

First claim

The invention claimed is:

1. A reagent dosing system for dosing a reagent into the exhaust gas stream of an internal combustion engine, the system comprising:
a reagent tank for storing a supply of reagent;
an injector module comprising an atomising dispenser and a positive-displacement metering pump which draws reagent from the reagent tank and delivers it to the dispenser;
a supply line coupling the reagent tank to the injector module;
a dosing control unit operable to control the injector module to inject reagent into the exhaust gas stream; and
an additional priming pump arranged, in use, to urge reagent along the supply line toward the injector module under selected conditions.

2. A system according to claim 1 , wherein the dispenser and the metering pump are integrated within the same unit.

3. A system according to claim 1 , wherein the priming pump is operable at or during a start-up mode.

4. A system according to claim 1 , wherein the priming pump is operable continuously or intermittently during running of the engine.

Assignees

• Delphi Tech Ip Ltd

Inventors

• Dingle Philip J G
• Hardy Martin Paul
• Zuelch Roman Stefan

Classifications

• F01N2900/0412

  using pre-calibrated maps, tables or charts · CPC title

• F01N2560/021

  for measuring or detecting ammonia NH3 · CPC title

• Y02T10/24

  Cross-Sectional Technologies · mapped topic

• F01N2240/25

  an ammonia generator · CPC title

• F01N2250/12

  absorption or adsorption, and catalytic conversion · CPC title