Reagent dosing system and method of dosing reagent

摘要

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.

主权项

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; an additional priming pump arranged, in use, to urge reagent along the supply line toward the injector module under selected conditions; and a tank module mountable within the reagent tank, said tank module comprising: a reservoir comprising a tubular member with a first open end and a second closed end, the second end having an opening therein to enable the inflow of reagent from the reagent tank; a closure member for closing the first end of the tubular member to prevent the flow of reagent therefrom; and a reagent pickup tube having a first end disposed within said reservoir and a second end in fluid communication with said supply line; wherein the priming pump is disposed within the tank module.