LAUNCH X-431 PAD III User Manual
118
Fig. 13-1
1) Contact break point: the primary circuit of ignition coil cut off, the secondary
voltage was sensed and increased sharply.
2) Ignition voltage: secondary coil voltage overcome the damper of high voltage
line, the contact breaker gap and the spark plug gap to release magnetizing
energy, 1-2 section is the breakdown voltage
3) Spark voltage: For the capacitor discharge voltage
4) Ignition voltage pulse: For the charge and discharge sections
5) Spark line: The inductance discharge process, i.e. the mutual inductance
voltage of ignition coil maintains the conduction of secondary circuit
6) Contact point close the current flow into primary coil, the primary coil
oscillates due to the mutual inductance.
Primary ignition waveform
Section a shows the voltage oscillation on the primary circuit due to the
magnetic induction of spark in the duration;
Section b shows the damped oscillation generated by remaining magnetic field
energy after the spark;
Section c shows the make contact magneting period of primary coil.
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