The control system composition of the fuel-air mixture (fuel injection system MFI)

Using the oxygen sensor signals, the system fuel injection (MFI) controls the timing and duration of the opening of the open state of the injector installed in the intake manifold for each cylinder, so as to provide an optimal composition of the fuel-air mixture and reduce emissions.

Because of this the exhaust gases produced by the engine correspond to the special composition, which gives the possibility of using three-way catalyst to reduce the concentration of toxic substances. The catalytic converter is used to convert the three main components of the exhaust gases ((1), unburned hydrocarbons (CH), (2) carbon monoxide (CO) and (3), nitrogen oxides (NOx)) in harmless substances. The system of fuel injection (MFI) can operate in two modes:

- Control without feedback on the composition of air-fuel mixture (?�open-loop?�) in accordance with data recorded previously in the electronic engine control unit;

- A feedback control on the composition of the air-fuel mixture (?�closed-loop?�) in accordance with the oxygen sensor signals coming into the electronic engine control unit.