Control unit
In all engines, ignition control is combined with injection control. Therefore, there is a common electronic control unit. Here is a short description of the control unit function:
The left picture shows the ignition characteristic of a traditional ignition system. On the right you can see that the characteristic of the Motronic and Simtec ignition systems is expressed much more strongly. That is, the ignition moment is adapted to each operating state much more precisely.
The Vectra ignition systems do not require any additional equipment to set the ignition timing. The engine has all possible engine data and characteristics at its disposal. This is ensured by the inductive pulse sensor, coolant temperature sensor, throttle potentiometer, etc. Based on all this data, the control unit calculates the correct ignition timing for each load condition.
If you depict the ignition angle (ignition timing) depending on the engine load and the number of revolutions, you can obtain the so-called ignition characteristic.
The control unit also has programs for adjusting engine start-up, cold engine operation, forced idle mode, etc.
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The control unit supplies the ignition coil with only as much current as it needs at the moment. In extreme cases, (ignition on, engine not running), with this ignition system, the ignition coil will not be damaged even after a long time.
Of course, there is an exchange of data with the injection. Also because several sensors in the engine have a dual function.
Finally, a fault memory device is also installed, which, as described in the chapters on injection, can be read with a special device available in the workshop.
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