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Contact-driven
Sensor-driven
In the mechanical ignition system, the charging time and the ignition time is
controlled by the distributor camshaft. Electrical sensor (Hall or magnetic) or contacts is
as the role of the sensor. Contacts can directly drive the ignition coil, but telex can only
drive the ignition coil by ignition enlarge. In fact, ignition amplifier is mounted in ignition
coil generally，in this case the primary ignition signal is undetectable.
6）Sensor
Hall devices and magnetic induction coil are commonly used sensors.
Hall device output square wave 0-5 volts or 0-12 volts.
Magnetic induction coil output sine wave, the amplitude is related to rotational
speed. Ignition control signal.
Ignition control module output control signal 0-5 V or 0-12 V square wave.
7）Secondary ignition
When ignition, coil secondary generates a high voltage，when the voltage is
gradually increased to a certain value，the spark plug produce sparks，this voltage is
the ignition voltage. The voltage then drops rapidly to another voltage value and
maintained for some time，this voltage is the
combustion voltage, combustion time is the
time of voltage maintained at a combustion
voltage value. At the end of the burning time,
ignition coil energy is almost exhausted, the
remaining
energy
oscillation on the coil.
Observing this picture can analysis of
operation of the vehicle from details. Ideally,
this pattern is very stable, showing each
voltage of ignition combustion processes are
is
formed
damped
1.
Electric shock
2.
Ignition coil
3.
Distributor / high voltage line /
spark plugs
1.
Sensor
2.
Ignition amplifier
4.
Ignition coil
5.
Distributor / high voltage line /
spark plugs
6.
Flashover segment
Closed section
Shock
attenuation
section
8
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