GF14.40-D-3030HU Component Description For Exhaust Aftertreatment Control Unit
GF14.40-D-3030HU Component Description For Exhaust Aftertreatment Control Unit
- 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
N141 AdBlue control unit
Location
The AdBlue(R) control unit is located below the driver seat.
Task
The AdBlue(R) control unit controls the following functions through a performance map:
^ AdBlue(R) delivery
^ AdBlue(R) injection
^ Antifreeze and recycling
Input and output signals
The following input signals are evaluated by the AdBlue(R) control unit and the corresponding output signals issued:
^ Direct input signals
^ Direct output signals
^ Drive train sensor CAN (CAN I) input signals
^ Drive train sensor CAN output signals
Direct input signals
- Circuit 31
- Circuit 30, over AdBlue(R) circuit 87 relay (K110)
- Sensor signal from AdBlue(R) pressure sensor (B151)
- AdBlue(R) tank fill level sensor signal (B152)
- Detection of the power consumption for diagnosis of the AdBlue(R) delivery pump (M89)
- AdBlue(R) tank temperature sensor signal (R51b1)
Direct output signals
- Supply circuit 31 of the AdBlue(R) relay
- Common supply circuit 30 for AdBlue(R) delivery pump and the AdBlue(R) switchover valve (Y129)
- Supply circuit 31 of AdBlue(R) delivery pump
- Pulse width modulation (PWM) signal for actuation of the AdBlue(R) delivery pump
- Control signal circuit 31 for actuation of the AdBlue(R) switchover valve PWM signal for actuation of the AdBlue(R) injection valve (Y130)
- Power supply for AdBlue(R) delivery module pump element (M89r1)
- Power supply for AdBlue(R) tank heating element (R51)
- Power supply for AdBlue(R) tank injection line heating element (R52)
Drive train sensor CAN input signals
CDI control unit (N3/30)
- Request from reduction agent injection
- Specification of the reduction agent quantity to be injected
- Specification of the run-on period of the control units
- Diagnosis request
Drive train sensor CAN output signals
CDI control module
- Injected reduction agent quantity for nitrogen oxides (NOx) reduction
- Reduction agent quantity to be injected for cooling the AdBlue(R) injection valve
- Fill level status in the AdBlue(R) tank
- Requested diagnostic data
AdBlue(R) delivery
- Feed to the AdBlue(R) delivery pump to obtain the operating current consumption for the purpose of diagnosis of the AdBlue(R) delivery pump
- Actuation of the AdBlue(R) delivery pump, to generate a pressure of 5 bar before and during the injection of reducing agent for nitrogen oxide (NOx) reduction. The delivery pressure can be set with the control unit software and may differ according to the particular variant.
- Actuation of the AdBlue(R) delivery pump, to generate a pressure of 5 bar before and during injection of the reducing agent for cooling the AdBlue(R) injection valve
- Actuation of the AdBlue(R) injection valve for ventilation of the AdBlue(R) injection line
AdBlue(R) injection
- Actuation of the AdBlue(R) injection valve during injection of the reducing agent for NOx reduction and for cooling the AdBlue(R) injection valve
Antifreeze and recycling
- When cold a pump pre-run is carried out after "circuit 15 ON". The initial run serves to reduce the friction in cold weather, so that, following a demand for pressure, the required compression can be made available as soon as possible.
- Actuation of the AdBlue(R) tank heating element to liquefy the AdBlue(R) reducing agent in the AdBlue(R) tank, which freezes at about -10°C
- Actuation of the AdBlue(R) delivery pump heating element and the AdBlue(R) injection line heating element to ensure flowability of the AdBlue(R) reducing agent which freezes at about -10°C in the AdBlue(R) delivery pump and in the AdBlue(R) injection line to the AdBlue(R) injection valve
- Actuation of the AdBlue(R) delivery pump, AdBlue(R) switchover valve and the AdBlue(R) injection valve for to return the AdBlue(R) reducing agent from the AdBlue(R) injection line to the AdBlue(R) tank during power-down of the AdBlue(R) control unit after "circuit 15 OFF"
The period of returning the AdBlue(R) reducing agent and the filling period of the AdBlue(R) injection line is dependent on the length of the AdBlue(R) injection line.
The quantity of reducing agent injected by the AdBlue(R) injection valve is sent by the AdBlue(R) control unit via the drive train sensor CAN to the CDI control unit. It is taken into account in the next computation of the quantity of reducing agent by the CDI control unit.