The AdBlue tank (standard tank capacity 60 litres, but also available in 45 and 120-litre versions) is located on the right-hand side between the wing and fuel tank. The diameter of the tank tube is small enough to prevent accidental introduction of the diesel nozzle.
The AdBlue gun has a valve at the end that is released by magnets located on the tank entry point and so it's impossible to accidentally fill up another tank (for instance, the main fuel tank) with AdBlue. The AdBlue intake duct – a level gauge is also installed on this – is surrounded by a hose in which engine water circulates. Opening of the heating system is regulated by a temperature sensor. The AdBlue filter system includes a prefilter on the tank and a fine-mesh filter located on the pump intake.
The latter is positioned under the rear cab suspension bar inside a sealed casing that also contains the control unit for dosing the AdBlue. Ducts are in stainless steel or plastic insensitive to the oxidising effect of AdBlue. They are heated by engine water (between the tank and pump) and an electric coil (between the pump and dosing module located along the chassis). The dosing module, which is fed with compressed air and AdBlue, is connected to an injector located on the exhaust pipe. The entire AdBlue storage, dosing and injection system has been subjected to testing in extreme climate conditions, both in Scandinavia and Spain, to ensure system reliability complies with European regulations.
The quantity of AdBlue to be injected is calculated by a control unit (dosage unit) that receives various types of input, for instance, the temperature of exhaust gases in the catalytic converter, quantity of fuel injected in the engine, flow of aspirated air and environmental conditions. The catalytic converter, together with the silencer, is located underneath the battery casing and comprises ceramic elements containing rare metals.
The temperature in proximity to the catalytic converter is measured by two probes, one at the intake and one at the outlet of the silencer, to check atomisation of the AdBlue. The catalytic converter/silencer casing is insulated to protect adjacent components from high temperatures.