Patent ID: 7644577
Filing Date: 2010-01-12
Classification: B01D,F01N,Y02A,Y02T

Abstract:
1. A reducing agent metering system for use with a lean burn internal combustion engine, comprising: (a) a metering system housing; (b) a system for metering vaporized reducing agent, said system comprising (i) a plurality of capillary flow passages mounted within said metering system housing, said plurality of capillary flow passages each having an inlet end and an outlet end; and (ii) a heat source arranged alone said plurality of capillary flow passages, each said heat source operable to heat the reducing agent within said plurality of capillary flow passages to a level sufficient to change the reducing agent from a liquid state to a vapor state and deliver vaporized reducing agent from said outlet end of each said capillary flow passage, said system positioned within said metering system housing; and (c) a system for delivering an atomized stream of liquid reducing agent, said system positioned within said metering system housing; wherein the reducing agent metering system is operable to transition from metering vaporized reducing agent to delivering an atomized stream of liquid reducing agent.