Ignition Current Limit

[Les Newell]

Most car ignitions are still inductive. CDI tends to cause too much radiated
interference and also does not seem to fire fouled plugs as well. Primary
current is usually controlled in two ways: either by directly measuring the
current and altering the dwell time to suit or by using a fixed dwell time
(not dwell angle) that does not allow the coil to saturate. With the second
method the dwell time is sometimes adjusted depending on battery voltage.

Les


> Hi All;
>
> Does anyone know how the auto manufacturers handle ignition? Are most of
the
> systems still inductive in nature or CDI? If inductive, how do they handle
> current regulation through the primary coil? Also, do any of the igniters
> out there (Bosch for example) regulate current or are they simply a potted
> transistor. Thanks in advance.
>
> Brian
>
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