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Description of the fuel injection-ignition system
1 - Description of the fuel injection-ignition system
General information on the fuel injection-ignition system
Integrated electronically controlled ignition and injection piloted by just one control unit ensure optimal
i.c. engine performance and output, thus reducing consumption and harmful substances into the
exhaust gas. These systems ensure accurate air-fuel ratio and optimal ignition advance.
This system consists of three different circuits:
Fuel circuit
Intake air circuit
Electric circuit (featuring control unit, sensors and actuators)
Importance of the air-fuel mixture and of the ignition advance
Correct use of the air-fuel mixture and of the ignition advance is fundamental for optimal engine
operation.
The air-fuel mixture is given by the ratio, in weight, of air and fuel taken in by the engine: the ideal or
stoichiometric ratio is that which establishes complete combustion. Excessive air or insufficient air give
rise to, respectively, a lean (or weak) mixture or a rich mixture, which affect power and consumption,
as well as emissions of exhaust gases.
Electronic control of the advance makes it possible to optimise the performance of the engine, the
maximum power and the consumption and concentration of exhaust pollutants.
Electronic control for the ignition advance and fuel supply allows for optimal functioning of the engine
under all conditions of use (low temperature start, warm-up stage, temporary acceleration /
deceleration stages, engine under partial load, full load, idle).
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