What is PD CEN/TR 16680 - Investigation on internal diesel injector sticking deposits mechanisms about?
PD CEN/TR 16680 describes the investigation into diesel vehicle common rail fuel injector sticking problems in several countries across Europe since 2005/2006, carried out by the CEN/TC 19/WG 24/IDID Task Force.
PD CEN/TR 16680 provides conclusions following this work that have been adopted by CEN.
Who is PD CEN/TR 16680 - Investigation on internal diesel injector sticking deposits mechanisms for?
PD CEN/TR 16680 on investigation on internal diesel injector sticking deposits mechanisms is useful for:
- Vehicle manufacturers
- Automotive industry
- Petroleum industry
- Investigation agencies
- Laboratories and research institutes
Why should you use PD CEN/TR 16680 - Investigation on internal diesel injector sticking deposits mechanisms?
Traditional external “coking” deposits form inside and around nozzle fuel flow holes on the outside tip of injector and are caused by combustion heat and gases, interacting with diesel fuel and engine lubricant components.
These deposits can affect the fuel spray pattern and volume of fuel delivered to each cylinder.
In the injector sticking case, two new types of internal injector deposits have been reported by vehicle manufacturers and FIE manufacturers, these two new types of internal injector deposits can also be found together (salt crystals inside a polymeric matrix), see Figure 1:
- Carboxylate soaps and salt deposits - typically soft, white/tan crystalline deposit
- Organic amide deposits - lacquer, polymeric in nature, typically hard, tan/orange/brown deposit
Deposits form on inner component surfaces of the injector restricting fuel flow by reducing armature lift and affecting injection timing and fuel volume delivery by armature and injector needle sluggishness and sticking (see also Figure 2).
In general vehicles covering higher mileages such as taxis and delivery vans are affected the most. Reported injector sticking symptoms include:
- Loss of power and acceleration
- Poor idle stability
- Increased diesel knock
- Misfire - especially during cold condition
Therefore, investigation on internal diesel injector sticking deposits mechanisms is very essential.
PD CEN/TR 16680 provides you information about problems with injector sticking reported in specific geographic areas like France, Germany, Spain, Denmark.
PD CEN/TR 16680 establishes that the root cause of the internal injector deposit problem that has resulted in vehicle failures in France, Spain and Denmark is due to different chemical interactions between fuel corrosion inhibitor additives and contaminants present in the diesel fuel from the production process. The failure mode was triggered by changes in vehicle fuel injection technology and the introduction of sulfur free fuel quality driven by more stringent legislative emission requirements.
