The Operating Mode Of Ignition Coil
The operating mode of ignition is as follows.
- Single spark - single spark ignition
- Multi-spark - multi-spark ignition
|
A |
Primary charging current |
B |
Recharging threshold |
C |
Secondary charging current |
|
D |
Discharging threshold |
E |
Ignition timing |
F |
Dwell time |
|
G |
Spark duration |
V |
Operating voltage |
Single Spark - single spark ignition
The ignition coil is normally charged one time per ignition process when the engine is warm, and ignition sparks are emitted. Even when performing a cold start, the high-energy ignition coil is used for securely igniting air-fuel mixture, achieving a long spark combustion time.
Multi-spark - multi-spark ignition
Unlike the single spark mode that sparks occur only one time, the multi-spark mode allows multiple times of ignition. At this time, only necessary sparks are emitted plural times, not continuous large sparks.
The multi-spark ignition enables the passing of a charge current again after the charge current is cut off and ignition sparks are emitted at ignition timing. When ECM measures this primary current and judges that primary current limit is reached, charge current is cut off and ignition sparks are emitted. Multiple ignitions are performed by repeating the above.