Diesel Exhaust Fluid Injector
The Diesel Exhaust Fluid (DEF) injector is located in the exhaust system downstream of the Diesel Particulate Filter (DPF). The DEF injector is secured to the S-shaped exhaust pipe with a clamp. Due to the position of the DEF injector on the S-shaped exhaust pipe, the DEF is injected axially to the exhaust gas flow direction. The high exhaust gas speed ensuring the DEF is mixed well and distributed evenly within the exhaust gas. The DEF injector consists of an injector and a passive cooling heat sink. The heat sink protects the injector from overheating due to the high exhaust temperatures.
The DEF injector works at high pressures to obtain the complete atomization of the injected DEF. The atomization of the DEF ensures the Selective Catalyst Reduction (SCR) catalytic converter is working to its optimum performance. The Powertrain Control Module (PCM) controls the DEF injector with Pulse Width Modulation (PWM) signals.