The MPFI is a system or method of injecting fuel into an internal combustion engine (IC)
Through multiple ports situated on the intake valve of each cylinder. It delivers an exact quantity of fuel in each cylinder at the right time. There are three types of MPFI systems – Batched, Simultaneous and Sequential.
Also, read – IC ENGINE: COMPONENTS AND THEIR FUNCTIONS, TYPES, AND TERMINOLOGY
In the batched MPFI system fuel is injected to the groups or
Batches of the cylinders without bringing their intake stroke together. 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.
MPFI includes a fuel pressure regulator, fuel injectors, cylinders,
Pressure spring and a control diaphragm.
It uses multiple individual injectors to insert fuel in each cylinder through
Intake port situated upstream of cylinder’s intake value. The fuel pressure regulator,
Connected to the fuel rail through an inlet and outlet,
Directs the flow of the fuel.
While the control diaphragm and pressure spring controls the
Outlet valve opening and the amount of fuel that can return.
The pressure in the intake manifold significantly
Changes with engine speed and load.
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