How the Common Rail Injection Fuel System Works

What is a common rail system? What are the components of a common rail fuel system? What are the sensors on the common rail and common rail images or common rail fuel system (CRI) images? Let's learn the structure and how the Fuel System Common Rail Injection (CRI) works in diesel engines below.

Definition and Function of Common Rail Fuel System In Common rail injection- The common rail injection (CRI) system checks the condition of the engine (engine speed, accelerator angle, cooler temperature, etc.) with sensors. Controller for control of common rail injection system (CRI) fuel injection rate, fuel injection time, fuel injection pressure, etc. engine in the best condition.

The common rail injection (CRI) function is the diagnosis and alarm function, with which the system computer checks the main components and notifies the operator of detected failures. In addition, the common rail injection (CRI) function is a failsaafe that stops the machine when the parts fail and the backup function that continues operation by changing the control method in such cases.

 

The common rail injection system (CRI) is divided by function into a fuel system and a control system. The fuel system distributes the high pressure fuel supplied by the fuel supply pump to the cylinder via common rail. The solenoid valve in the injector opens and closes the nozzle needle valve to start and complete the injection.

There are sensors in common rail diesel engines such as common rail pressure sensors, NE sensors, G sensors. These sensors function as input controllers in the fuel system common rail injection (CRI) diesel engine. 

 Common Rail Injection (CRI) Components 

In the components of the common rail injection fuel system, there are vital common rail components such as fuel supply pumps, etc. Below are the common components of the diesel engine fuel system:

image-fuel-system-cri

 1. NE speed sensor 

 2. Engine controller 

 3. Injector 

 4. Orifice (for bleeding air) 

 5. Fuel tank 

 6. Pre-fuel filter 

 7. Main fuel filter 

 8. Overflow valve 

 9. Fuel supply pump 

     9A. PCV 

     B. High-pressure pump 

     9C. Priming pump 

     9D. Feed pump 

     9E. Relief valve 

     9F. Bkup speed sensor 

    (G sensor) 

 10. Common rail 

 11. High-pressure injection pipe 

 13. Pressure limiter 

 15. Engine controller cooler 

 12. Flow damper 

 14. Electric priming pump 

Control system Fuel System Common Rai Injection ( CRI ) 

The engine controller calculates and controls the energy time and energy period of the injector with signals from the sensors being fed to the engine to inject the right amount of fuel in the right time. The control system is roughly divided by electrical parts into sensors, computers, and actuators

Cara Kerja Fuel System Common Rail Injection ( CRI ) 

Structure And How Fuel System Common Rail Injection Works Heavy equipment diesel engines have a common rail fuel system. The common rail injection (CRI) system consists of a fuel supply pump, a common rail, an injector, an engine controller to control it, and sensors.

The fuel supply pump generates fuel pressure on the common rail. The pressure of the fuel is controlled by the exhaust rate of the fuel supply pump. The exhaust level is controlled by turning on and off the PCV (pressure control valve) of the fuel supply pump according to the electrical signal from the engine controller. Common rail receives pressurized fuel from the fuel supply pump and distributes it to the cylinder.

Fuel pressure sensed by common rail pressure sensor is attached to the common rail. Furthermore, feedback control is applied so that the fuel pressure will correspond to the command pressure according to the engine speed and the load on the engine.

Fuel pressure on the common rail (CRI) is applied to the side of the injector nozzle and to the control chamber through the piping (tube) of fuel injection of each cylinder. The injector controls the fuel injection rate and fuel injection time by turning on and turn off TWV (2-way selenoid valve).

If the TWV is energized, the fuel circuit changes so much that the high pressure of the fuel in the control chamber will flow through the oriffice. As a result, the needle valve is raised to start fuel injection by a high-pressure fuel pressure cranking nozzle on the nozzle side.

If the TWV is de-energized, the fuel circuit is so changed that the high pressure of the fuel will be applied to the control chamber through the oriffice. As a result, the needle valve lowers and completes the fuel injection. Thus, the fuel injection timing and bfuel injection rate are controlled by the time to turn on the TWV and the length of the TWV ignition time, respectively.

Lokasi: Indonesia

Berbagi :