September 2017
Intermediate to advanced
700 pages
28h 19m
English
Content preview from Automobile Electrical and Electronic Systems, 5th Edition
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Ignition
279
7.2.2 Constant dwell systems
The term ‘dwell’ when applied to ignition is a measure of the time during which
the ignition coil is charging, in other words when the primary current is owing.
The dwell in conventional systems was simply the time during which the contact
breakers were closed. This is now often expressed as a percentage of one charge–
discharge cycle. Constant dwell electronic ignition systems have now been replaced
almost without exception by constant energy systems discussed in the next section.
Whilst this was a very good system in its time, constant dwell still meant that
at very high engine speeds, the time available ...
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