What is the main requirement of an injector nozzle?
The nozzle seat is the first important element of the injector nozzle. Some requirements of the seat are that it must seal well, maintain a consistent and predictable seating line and help maintain accurate fuel metering over the life of the engine.
How does the injector of a common rail system differ from most other injectors?
Common rail injectors utilize a high-pressure fuel rail that provides fuel to the individual injectors. Unlike with unit injectors, the rail maintains the fuel at a constant, high pressure that is necessary for injection. Because of this, the pump is a separate component, rather than a part of the injector itself.
What is difference between nozzle and injector?
As nouns the difference between injector and nozzle is that injector is any of various devices that are used to inject something while nozzle is a short tube, usually tapering, forming the vent of a hose or pipe.
Why do common rail injectors fail?
Water contamination: Another common cause of Common Rail injector failure is contamination from excess water in the fuel. If not stored or handled correctly, water can enter the fuel and will react with the chemicals in it to corrode metal surfaces and reduce lubrication between the moving parts.
What are the six types of diesel injectors?
Types of Diesel Fuel Injection Systems
- Throttle Body Injection. Throttle body injection (TBI) is very similar to carburetion; so similar, in fact, that many throttle body injection units were actually adapted from gas carburetors.
- Multipoint Injection.
- Direct Injection.
- Common Rail Injection.
What pressure does a common rail diesel run at?
29,000 PSI
Common rail direct fuel injection is a direct fuel injection system for petrol and diesel engines. On diesel engines, it features a high-pressure (2,000 BAR – 29,000 PSI) fuel rail feeding individual solenoid valves, as opposed to a low-pressure fuel pump feeding unit injectors or pump nozzles.How do I keep my diesel injectors from going bad?
“You can definitely delay the degradation process by buying high-quality fuel and changing your filters regularly to prevent debris from getting into the system,” Milne said. “That will prevent the injectors from corrosion or getting worn out faster in high mileage situations.”
How does a common rail diesel fuel injector nozzle work?
Common rail—nozzle operates under more demanding tribological conditions and must be better designed to prevent leakage. Unit injector/unit pump—pressure pulsing conditions create more demanding fatigue strength requirements. Pump-line-nozzle—hydraulic dead volume must be minimized. Figure 1. Basic diesel injector nozzle with single cone seat
What should opening pressure be for diesel fuel injector?
Tolerances in nozzle opening pressure for common rail injectors for some applications can be as tight as 1% [2194]. Figure 1 and Figure 2 show several examples of nozzle seat designs that have been used in closed nozzle diesel fuel injectors [2197][2192][2195].
What are the benefits of common rail injectors?
Common Rail injectors make possible fine electronic control over the fuel injection time and quantity, and the higher pressure that the common rail technology makes available provides better fuel atomization.
What happens when you open the nozzle valve on a diesel engine?
Depending on how the seating line of the nozzle valve wears and whether it travels towards the tip or away from the tip, nozzle opening pressure can increase or decrease and produce unwanted changes in injection duration and injection quantity. This was explained when discussing injection system components.