Advanced science.  Applied technology.

Search

Urea Deposit Detection For Use With SCR Emissions Control System

Abstract: 

A method of detecting urea-derived deposits in the exhaust line of an internal combustion engine having an SCR (selective catalyst reduction) aftertreatment system. A radio frequency (RF) transmitter is placed upstream of the SCR system's urea injector, and an RF receiver is placed downstream of the mixer. The transmitter and receiver are used to acquire baseline RF data representing a clean condition exhaust line without deposits. During subsequent operation of the engine, the transmitter and receiver are used to acquire subsequent RF data, which is compared to the baseline data after being corrected for temperature differences. If the comparison indicates the presence of one or more deposits, an alert signal is generated. 

Patent Number: 
10,161,283
Date Of Issue: 
12/25/2018
Inventors: 

Scott Eakle; Cary Henry; Phillip Weber