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Ignition control system
The ignition control system controls the ignition to the optimum timing. There are two types: fixed ignition and soft igni-
tion.
Fixed ignition
When the following conditions are met, the ignition timing is fixed to the initial set position of the crank angle signal.
Condition for execution: Either of the following
• when engine speed is below 5OOrpm
• when microcomputer fails.
Other than the above, the soft ignition is used.
Soft ignition control
The soft ignition control has two phases: ignition timing control (ignition advance control) and current flow time control.
(2) Ignition timing control
The ignition advance is calculated by using the following equation.
Ignition advance=Basic advance + Cooling water temperature compensation advance
+ idle stabilizing compensation advance
Each of the above advances is described below.
Basic advance How much the basic advance is controlled depends on the conditions of the idle switch.
• When the idle switch is ON
The basic advance is set according to the engine speed.
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