Fiat Bravo Service Manual page 221

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IGNITION MANAGEMENT

The ignition management strategies have the objective of striking the spark with the desired advance ac-

cording to the engine operating conditions.

The management of the ignition basically consists of determining the ignition advance and its imple-

mentation by controlling the power module, connected externally to the control unit.

The value of the "basic" advance, calculated on the basis of the intake air flow rate and the engine

speed, is then corrected depending on the different engine operating conditions.

The control unit determines the moment of the start of the conduction of the current in the coil primary

winding on the basis of the engine rotation speed.

This moment obviously varies in relation to explosion T D C for each cylinder and the greater the engine

rotation speed, the greater the advance because the time (dwell) required to saturate the current in the

coil primary winding is more or less constant.

The moment of the start of conduction is corrected according to the battery voltage.

1. Ignition power module earth

2. Ignition power module

3. Single ignition coil (plug-top)

4. Secondary coil earth

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