Ignition System; Degital Ignition System - Kubota WG972-E2 Workshop Manual

WG972-E2, DF972-E2, WSM

6. IGNITION SYSTEM

[1] DEGITAL IGNITION SYSTEM

■ General
The function of an ignition system is to provide the
electrical spark that ignites the air/fuel mixture in the
cylinder at precisely the correct time.
For this purpose, the pick-up sensor (3) detects
voltage waveform according to the shape of the rotor (2)
that is built into the flywheel (1). The voltage waveform
signal is fed to the igniter (4), in which the signal is
converted by a microprocessor to the angular and rpm
data that corresponds to each cylinder. Based on this
information, an optimum timing is figured out by the
microprocessor to cut off the current that flows to the
ignition coil (5) of each cylinder. The duration of current
flowing to the ignition coil (5) is also controlled. In this
way, a high voltage is generated at the secondary
winding of the ignition coil (5), which activates the spark
plug (6).
Without any mechanical contact, the ignition system
is digitally microprocessor-controlled
reliability and higher precision.
• Control at ignition time :
The ignition time is controlled
engine speed.
• Control at energizing time :
The energizing time of the ignition coil is controlled
according to the engine speed.
• Lock prevention :
Intercept the current of the coil for the damage
prevention of the coil when the ignition switch is
energized to the coil as turning on.
• Lock prevention :
Intercept the current of the coil for the damage
prevention of the coil when the ignition switch is
energized to the coil as turning on.
(1) Flywheel
(2) Rotor
(3) Pick-up Sensor
M-22
GASOLINE / LPG ENGINE
for greater
according to the
(4) Ignitor
(5) Ignition Coil
(6) Spark Plug
W1014569
KiSC issued 01, 2006 A