Hydraulic force can be used pressurize fuel to make diesel engines stronger and more efficient. The first model in diesel injection system is hydraulically actuated electronic unit injection system (HEUI). HEUI uses hydraulic energy to pressurize lubrication oil for injection. The hydraulically pressurized fuel is supplied to the fuel injector in HEUI.
lubrication oil that is pressurized to high level to presssurize fuel for injectors. HEUI is more efficient than fuel injection system based on mechanical means. It pressurizes fuel even when the engine is operating at low speed for fuel distribution to the ignition system.
The HEUI pressurizes lubrication oil at a pressure range of 6 MPA-25 MPA to pump the fuel into the injection system. It can improve the power output and the fuel economy of your vehicle.
Hydraulic pressurization of fuel
HEUI are gradually replacing mechanical camshaft with pressurized lubrication oil. The functions of HEUI injectors are pressurizing, metering. The HEUI injectors uses high pressure oil to power the fuel into the injection system rather than the fuel pump. It uses high pressure pump which does not create pressure instead It creates a volume of oil for the injectors to use
The inlet and outlet valve is controlled by hydraulic actuation. The HEUI working is similar to the working of hydraulic cylinders,where the lubrication oil is pressurized. HEUI system even reduces noise produced during combustion process.
The components of HEUI injector include the high voltage electric solenoid, poppet valve, poppet return springs, intensifier piston and the nozzle.
Electric solenoid
These are mounted on the cylinder head. They control poppet valve operations. The high actuated electric solenoids requires 7-12 amps of current.
Poppet valves
Poppet valves control the flow of oil pressure into the injector.
Poppet return springs
These are used to control the movement of the poppet valves. The spring compresses when the poppet valve opens and comes to its original position when the valve closes.
Intensifier piston
It is also called amplifier piston. It is used to magnify the pressure of lubrication oil resulting to magnification of hydraulic pressure of a fuel.
Nozzle
The nozzle atomizes the fuel at a high velocity. The nozzle sprays fine droplets of fuel at a high velocity which eases combustion.
Advantages of HEUI
1. Less noise is produced during combustion.
2. HEUI is less weight and reliable compare to mechanical actuated systems.
3. Performance of the vehicle is high.
4. It does not depend on speed of the engine.
5. Results in better fuel economy.
Applications
lubrication oil that is pressurized to high level to presssurize fuel for injectors. HEUI is more efficient than fuel injection system based on mechanical means. It pressurizes fuel even when the engine is operating at low speed for fuel distribution to the ignition system.
The HEUI pressurizes lubrication oil at a pressure range of 6 MPA-25 MPA to pump the fuel into the injection system. It can improve the power output and the fuel economy of your vehicle.
Hydraulic pressurization of fuel
HEUI are gradually replacing mechanical camshaft with pressurized lubrication oil. The functions of HEUI injectors are pressurizing, metering. The HEUI injectors uses high pressure oil to power the fuel into the injection system rather than the fuel pump. It uses high pressure pump which does not create pressure instead It creates a volume of oil for the injectors to use
The inlet and outlet valve is controlled by hydraulic actuation. The HEUI working is similar to the working of hydraulic cylinders,where the lubrication oil is pressurized. HEUI system even reduces noise produced during combustion process.
The components of HEUI injector include the high voltage electric solenoid, poppet valve, poppet return springs, intensifier piston and the nozzle.
Electric solenoid
These are mounted on the cylinder head. They control poppet valve operations. The high actuated electric solenoids requires 7-12 amps of current.
Poppet valves
Poppet valves control the flow of oil pressure into the injector.
Poppet return springs
These are used to control the movement of the poppet valves. The spring compresses when the poppet valve opens and comes to its original position when the valve closes.
Intensifier piston
It is also called amplifier piston. It is used to magnify the pressure of lubrication oil resulting to magnification of hydraulic pressure of a fuel.
Nozzle
The nozzle atomizes the fuel at a high velocity. The nozzle sprays fine droplets of fuel at a high velocity which eases combustion.
Advantages of HEUI
1. Less noise is produced during combustion.
2. HEUI is less weight and reliable compare to mechanical actuated systems.
3. Performance of the vehicle is high.
4. It does not depend on speed of the engine.
5. Results in better fuel economy.
Applications
- These engines are use in heavy and medium trucks.
- These are used in military vehicles.
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