The AdBlue tank ( standard tank capacity : 60 liters , also available 45 and 120l ) is placed
on the right side , between the fender and the fuel tank . The diameter of the fill tube is
sufficiently low to avoid the accidental introduction of diesel dispenser . the gun
AdBlue dispenser is equipped with the end of a valve , which is unlocked by means of magnets
located at the entrance of the tank. In this way, the AdBlue can not be paid by mistake in a
another tank ( for example , the main tank of the diesel fuel). The suction pipe on AdBlue
which is also installed on the level indicator - is surrounded by a duct in which the water circulates
of the engine. The heating system is opened by a temperature probe . the filtering
AdBlue is ensured by a pre- filter, located on the tank , and by a fine filter , located at the entrance
of the pump. This is located under the rear cab suspension crossmember ,
inside a hermetic casing which also contains the control unit for dosing
AdBlue . The pipes are made of stainless steel or plastic insensitive oxidant effect
AdBlue . Are heated by the engine ( between the tank and pump ) and a resistor
electricity ( between the pump and the dosing module , located along the frame ) . The dosage form , which
receives the compressed air and the AdBlue , is connected to an injector placed on the discharge pipe .
The entire storage facility, dosing and injection of AdBlue has been the subject of campaigns
test in extreme weather conditions , both in Scandinavia and Spain , to ensure the reliability
system required by European regulations .
The amount of AdBlue injected is determined by a control unit ( unit dosage ) that receives different
information, such as information relating to the temperature of the exhaust gas in the catalyst , the
quantity of fuel injected into the engine , the intake air flow rate and environmental conditions .
The catalyst is placed under the battery case in place of the muffler and is formed by elements
ceramics containing rare metals . The temperature in correspondence of the catalyst is detected by two
probes placed at the entrance and exit of the muffler to check the spraying AdBlue .
The casing of the silencer / catalytic converter is provided with an insulating coating to protect
adjacent components by the high temperatures .
Controlling the operation of the SCR system
The
legislation currently in force ( EEC 88/77-EC 1999/96-EC 2001/27 )
allows you to register , as well as Euro 3 vehicles with emission level
Euro 4 or Euro 5, but does not establish other constraints that the
system of emission control must be respected. The
European Commission has therefore focused on the problem of ensuring
the effectiveness and efficiency of the system over time of emissions
control has prepared the Directive Euro 4 emission which should be
published in mid-2005 . The
Directive Euro 4 , in addition to the levels of emissions defines ,
regardless of the technology used , the characteristics that the
emission control system must possess. The
Euro 4 vehicles that will enter into service after 1 October 2006 ( 1
October 2005 for new type approvals ) must be equipped with a diagnostic
system (On Board Diagnostic) system operation to reduce emissions . In
the case of the SCR , it will then turn on a warning light when the
AdBlue level drops below a certain value (minimum 10% of capacity ) .
The signal lamp for " irregular engine operation " will light up when the tank is empty. The
Iveco Stralis Euro 4 will be offered this year already provided in
advance of these lights is that of an AdBlue level gauge , visible on
the instrument panel display via the menu. The OBD is already able to identify and store the system malfunctions. With
a year's difference from the date of implementation of the first phase ,
from 1 October 2007 for new registrations (starting from 1 October 2006
for new approvals) , all Euro 4 vehicles , again regardless of the
technology used , must be equipped with a system of " incentive to respect the law." If
the content of nitrogen oxides exceeds a certain extent the maximum
allowable value , the message " irregular engine operation " will be
displayed on the instrument panel and the fault will be stored in the
onboard computer. Upon
successful completion of the ongoing level of pre- alarm (or in the
case of empty tank with the SCR system ) , will begin the process of
reducing engine torque via the electronic management system of fuel
injection . This will be done after the first stop of the vehicle.
Also
according to the new Euro 4 standard , the manufacturer must ensure
that the vehicles of category N3> 16t meet the levels of pollutant
emissions to 500,000 km or 7 years (N3 < 16t , 250,000 km - 6 years) .
The
governments of several European countries will have to implement a
procedure of inspection by accredited operators , who control the
contents of memory on-board computer to verify that the motor has always
worked in accordance with the Euro 4 standards .
