Removal of AdBlue for optimal use of exhaust flaps on a Scania S730 NextGen
Introduction :
We worked on a Scania S730 NextGen with a 16-liter engine and 537 kW (730 horsepower). The engine type is the DC16 107/730 hp. It has no low oil pressure rev limit and features a single-stage cooled Exhaust Gas Recirculation (EGR) system. It complies with the Euro 6 emissions standard and is equipped with an EMD1 engine management system and NOx control for torque reduction. We deactivated the AdBlue system to avoid faults due to NOx control, but for legal reasons we left it on switch.
Scania S730 exhaust flap optimization
Scania S730 exhaust flap optimization
The Scania S730 NextGen is equipped with an AdBlue system to reduce NOx emissions. However, when exhaust valves are used, there may be faults in the system due to NOx control. To avoid these defects while maintaining optimal use of the exhaust flaps, we have deactivated the AdBlue system.
Reprogramming the EMD1 module: In order to prevent faults from escalating between the EEC3 box (Emission Engine Control) and the EMD1 box (engine computer), it is necessary to reprogram the EMD1 module. This allows correct management of deflected exhaust gases when the exhaust valves are activated and avoids faults related to NOx control.
NOx control is a system that reduces nitrogen dioxide (NOx) emissions in the exhaust gases. It is generally carried out using an exhaust gas recovery system, such as the EGR (Exhaust Gas Recirculation) system, which allows part of the exhaust gases to be reinjected into the engine to be burned again. However, when the exhaust flaps are activated, the exhaust gases are deflected and there may be faults in the system due to NOx control and therefore causes engine torque reduction and dashboard fault. (generally after about twenty minutes on NextGen with EMD1 computer).
In order to avoid the transmission of faults between the EEC3 box (Emission Engine Control) and the EMD1 box (engine computer), it is necessary to reprogram the EMD1 module. This allows correct management of deflected exhaust gases when the exhaust valves are activated and avoids faults related to NOx control.
Conclusion :
By deactivating the AdBlue system and reprogramming the EMD1 module, we were able to optimize the use of the exhaust flaps on Scania S730 NextGen while avoiding faults related to NOx emission control. This modification makes it possible to maintain use in accordance with the standards in force (Euro 6) while benefiting from the advantages of the exhaust valves. It is important to note that the installation of a switch to deactivate the AdBlue and the DPF when the vehicle is used on a closed road does not alter its operation, which remains in compliance with the legislation. The exhaust gases are then filtered by the DPF and the truck can benefit from optimal use of the exhaust valves over a long period of time.
