Cri fuel system pada dozer 155 komatsu

Summary

This video explains the operation of a high-pressure fuel system, detailing the process of fuel transfer from Central Sulawesi to Jember, regulated by low and high-pressure pumps. The system relies on an overflow valve to control pressure and a camshaft-driven pump to generate high pressure. The PCV valve, controlled by the engine control unit, regulates the fuel flow to the common rail, from which the fuel is distributed to injectors. These injectors precisely spray the fuel into the combustion chamber, ensuring optimal engine performance through timed and controlled injections.

Takeaways

• 😀 The presenter is Fakhrurrozi from the PPS section, explaining how the common rail system works.
• 😀 The fuel is transferred from Central Sulawesi to the Jember high-pressure pump by the low-pressure pump.
• 😀 The low-pressure pump circuit's pressure is regulated by an overflow valve, which maintains the system's pressure.
• 😀 The high-pressure pump generates fuel at a pressure of 900-1000 bar, driven by the camshaft through the camshaft pin.
• 😀 The plunger in the high-pressure pump moves up and down due to the camshaft's motion.
• 😀 The pressurized fuel in the common rail is controlled by the PCV valve, which regulates the fuel volume.
• 😀 The PCV valve is activated in an on-off manner by the engine control unit (ECU), using input from sensors.
• 😀 Once the fuel reaches the common rail, it is distributed to each injector.
• 😀 The injector injects high-pressure fuel into the combustion chamber according to the timing, volume, and pressure of the injection.
• 😀 The entire system ensures efficient fuel delivery to the engine's combustion chamber, optimizing engine performance.

Q & A

What is the main function of the overflow valve in the common rail system?

The overflow valve regulates the pressure in the low-pressure pump circuit to ensure consistent fuel flow and prevent over-pressurization.

How does the high-pressure pump function in the common rail system?

The high-pressure pump, driven by the camshaft, pressurizes the fuel to around 900-1200 bar. This pressurization is necessary to inject fuel into the combustion chamber under high pressure.

What role does the PCV valve play in the common rail system?

The PCV valve controls the volume of fuel by operating in an on-off manner. It is controlled by the Engine Control Unit (ECU), which receives input from various engine sensors.

How is the fuel pressurized in the common rail system?

Fuel is pressurized by the high-pressure pump, which is driven by the camshaft. The pump increases the fuel pressure to around 900-1200 bar before sending it to the common rail.

What happens after the pressurized fuel enters the common rail?

Once the fuel enters the common rail, it is distributed to each injector, which injects the fuel into the combustion chamber based on the precise timing and volume control.

How does the Engine Control Unit (ECU) control the common rail system?

The ECU controls the PCV valve, which in turn regulates the fuel volume by receiving inputs from various engine sensors. The ECU ensures that fuel is injected at the right time and in the correct amount.

What is the purpose of the camshaft in the high-pressure pump?

The camshaft drives the high-pressure pump, creating the up-and-down motion of the plunger that generates the necessary pressure to pump fuel to the common rail.

Why is it important for fuel to be injected at the right time and in the correct volume?

Precise timing and volume control of fuel injection are crucial for optimizing combustion efficiency, reducing emissions, and improving engine performance.

How is the high-pressure pump's performance controlled in the common rail system?

The high-pressure pump's performance is primarily controlled by the camshaft, which drives the pump to generate high pressure, and the ECU, which regulates the volume of fuel injected through the PCV valve.

What is the role of the injectors in the common rail system?

The injectors spray the pressurized fuel from the common rail into the combustion chamber at the right time and in the appropriate amount for efficient combustion.