Step Basic Advance Angle

The second step involves calculation of the basic advance angle. Input sensors used in basic advance angle calculation are:

• Intake Manifold Pressure (PIM)

The basic advance angle is primarily a function of inputs from the engine rpm and intake air volume sensors. This calculation is equivalent to the combined centrifugal and vacuum advance on a mechanical distributor.

8TDC ATDC

- Change In Computed Timing

8TDC ATDC

- Change In Computed Timing

• As engine rpm increases, spark angle is advanced.

• As intake air volume (engine load factor) increases, spark angle is retarded.

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