Suzuki DF 30 - Ignition Timing Control

ENGINE CONTROL 3-5
IGNITION TIMING CONTROL
Outline
The ignition timing varies based upon engine speed.
The CKP sensors monitor current engine speed and send signals to the CDI unit.
Based on this signal, the CDI unit determines the optimum ignition timing and supplies voltage to the primary
winding of the ignition coil.
Basic sensor
Ignition timing is deter-
mined by a digital map de-
signed in relation to engine
speed.
CDI unit
Signal
Ign.coil
Signal
Ign.coil
Signal
Ign.coil
CKP sensor :
Informs CDI unit of engine speed and crankshaft angle.
Control mode
When starting (at the time of cranking):
The ignition timing is fixed at BTDC 5° until the engine starts.
When operating (normal operation):
The ignition timing varies in the range of BTDC 5° – 31° (DF25) or 29° (DF30) according to the engine
operating condition.