Page 791 - Foton Workshop Manual - Auman EST-M

Engine section - Exhaust purification device EG - 275

Working Principle IN

Diesel engine exhaust treating fluid converts nitrogen oxides (NO x) produced by the engine (exhaust) into
harmless nitrogen and water. The urea injector nozzle injects a precisely controlled amount of urea into the DI
exhaust system upstream of the catalyst. The SCR system uses air from a vehicle compressor system to inject
the AdBlue into the exhaust system through the injection unit of post-processing diesel exhaust gas treating
EG
fluid. Before starting the injection of AdBlue, the engine must be operated with nitrogen oxides (NO x) being
generated. The temperature of the catalyst must be above 200 °C. The control of the SCR system is provided
by the Electronic Control Module (ECM) and requires input of various parameters before starting injection of TR
AdBlue. Depending on the duty cycle and engine operating conditions, the amount of diesel exhaust treating
fluid used in varies vehicle applications is different. After the engine is shut down, the injection unit performs
AX
a system purge cycle to clear all remaining AdBlue in the supply tube and the injector nozzle.

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EG-275