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5 THE BASICS OF ELECTRONIC ENGINE CONTROL
Figure 5.22
Electronic
Distributorless
Ignition System
in power delivery during its power stroke. The other cylinder will be in its
exhaust stroke and the spark will have no effect. Most engines have an even
number of cylinders and there will be a separate driver circuit and coil for each
pair of cylinders.
An ignition system such as this is often called a distributorless ignition
system (DIS) because the multiple coil packs and drivers are a modern
replacement for the (now essentially obsolete) distributor (see Chapter 1).
182 UNDERSTANDING AUTOMOTIVE ELECTRONICS
