EXHAUST EMISSION CONTROL SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide an exhaust emission control system capable of performing urea water supply control even in failure of an SCR inlet temperature sensor without a large difference as compared with the time of sound operation thereof.

SOLUTION: The system includes: an SCR inlet temperature sensor 109 installed at an inlet of an SCR device 103 to detect SCR inlet temperature; a urea water supply controller 1 for controlling urea water supply into exhaust gas upstream of the SCR device 103 on the basis of the SCR inlet temperature detected with the SCR inlet temperature sensor 109; and a substitute temperature supply section 4 for supplying DFP inlet temperature detected with a DPF inlet temperature sensor 2 to the urea water supply controller 1 as substitute temperature for the SCR inlet temperature with respect to the urea water supply controller 1, when the SCR inlet temperature sensor 109 is in failure.

COPYRIGHT: (C)2012,JPO&INPIT