Diesel Emissions Fluid Injector Nozzle: Description and Operation
GF14.40-D-3047HU Component Description For AdBlue Injection Valve
- with CODE (MG5) Engine OM 642 DE 30 LA, 140 kW (190 hp) 3800 rpm
- with CODE (MH1) Low-emission engine EPA 10/CARB
- with CODE (ZU7) National version for Canada
- with CODE (MG5) Engine OM 642 DE 30 LA, 140 kW (190 hp) 3800 rpm
- with CODE (MH1) Low-emission engine EPA 10/CARB
- with CODE (ZU8) National version for USA
1 Diesel particulate filter (DPF)
20 AdBlue(R) injection line
Y130 AdBlue(R) injection valve
Location
The AdBlue(R) injection valve is located on the vehicle underbody between the DPF and the downstream SCR catalytic converter.
A mixing element in the exhaust pipe is located about 10 cm downstream of the AdBlue(R) injection valve. This serves to achieve improved hydrolysis and even distribution of the AdBlue reducing agent upstream of the SCR catalytic converter. This is an important precondition for obtaining a high rate of conversion of the nitrogen oxides (NOx).
Task
The tasks of the AdBlue(R) injection valve are subdivided into the following partial tasks:
^ Fuel injection
^ Aeration and ventilation of the AdBlue(R) injection line
Fuel injection
The AdBlue(R) injection valve sprays in the reducing agent AdBlue(R) to reduce the NOx.
Aeration and ventilation of the AdBlue(R) injection line
- Actuation of the AdBlue(R) injection valve to prevent formation of an air cushion in the AdBlue(R) injection line when filling the AdBlue(R) injection line
Actuation of the AdBlue(R) injection valve to prevent the formation of a vacuum during the return flow of residual AdBlue(R) reducing agent with "circuit 15 OFF" during power-down of the AdBlue(R) control unit (N141)
The duration of the return flow of the AdBlue(R) reducing agent and the duration of the injection line filling depend on the length of the injection line.
The AdBlue(R) control unit sends the injected quantity of reducing agent over the drive train sensor CAN (CAN I) to the CDI control unit (N3/30). This quantity is taken into account in the next computation of the quantity of reducing agent by the CDI control unit.