What is the working principle of fuel injector?
Working principle of a conventional fuel injector: It lifts off its seat while spraying the diesel into the cylinder in highly atomized or mist form. The moment the pressure drops, the needle valve comes back to its seat, which causes the injection to stop. The injection nozzle has extremely critical tolerances.
How does a MEUI fuel system work?
MEUI Fuel System The Mechanically actuated Electronically controlled Unit Injectors (MEUI), also known as Electronic Unit Injectors (EUI), also use the engine camshaft and push rods to generate fuel injection pressure, but use an Electronic Control Module (ECM) to control the amount of fuel injected into the cylinders.
What is the VOP for EUI fuel system?
The downward movement of the plunger pressurizes the fuel in the plunger cavity and nozzle. When the fuel pressure reaches the Valve Opening Pressure (VOP) of about 18.5 MPa (2,700 psi), the nozzle valve lifts off its seat and injection begins.
How does multi point fuel injection work?
The MPFI is a system or method of injecting fuel into internal combustion engine through multi ports situated on intake valve of each cylinder. In the simultaneous system, fuel is inserted to all cylinders at the same time, while the sequential system injection is timed to overlap with intake stroke of each cylinder.
Where is the fuel pump on a diesel engine?
The diesel lift pump is located in the fuel tank and removal is identical to a gas fuel pump setup.
How does a meui fuel injector system work?
MEUI systems are mechanically actuated but electronically controlled. Unit injectors are driven by a rocker arm that moves with the camshaft’s rotation. High fuel pressure is created in each injector using an integral plunger pump controlled by a rocker arm. MEUI systems provide variable fuel delivery and are virtually adjustment free.
How are unit injectors being replaced by rail technology?
While advanced, electronically controlled unit injector systems with the capability for multiple injections and rate shaping have been developed, unit injectors are gradually replaced by common rail technology.
How does the HEUI fuel injection system work?
An interesting yet complicated injection system that functions by using pressurized engine oil to fire its fuel injectors, HEUI is the perpetual underdog in diesel performance.
Which is the largest unit injector in the world?
Presently, the highest injection pressures are only available from unit injectors. The largest injectors currently pressurize to over 30,000-psi. This is about 20% higher than current common rail injection systems. Unit injection systems with 33,000-psi pressures 285 are planned.