ESA - Ignition
Circuit
r
y
DWELL ANGLE CONTROL CIRCUI
T
This circuit controls the length of time during
which Tr2 is on, in order to assure the proper
secondary voltage
.
/--
IYV I
C
A dwell angle control circuit is provided in the
Engine ECU in recent engines
. The igniter starts
the flow of primary current when the IGT signal
is on and stops that current when it is off
. The
Engine ECU lengthens the dwell angle by advan-
cing the timing by which the IGT signal is
switched on when engine speed increases
.
IGF SIGNAL GENERATION CIRCUIT
®
This circuit
generates
the IGF signal and sends it
to the ECU
.
LOCK-UP PREVENTION
CIRCUI
T
This circuit forces Tr2 to go off if it locks up (that
is, if current flows continuously for a period
longer than a predetermined period), in order to
protect the ignition coil and Tr2
.
OVER-VOLTAGE
PREVENTION
CIRCUIT
This circuit forces Tr2 to go off if the power
supply voltage becomes too high, in order to
protect Tr2 and the ignition coil
.
Ignition
coil
\
Ignition
switc
h
Battery
Ilk
Micro-
processor
Input
circuit
Senso
r
G
NE
OHP 6
2
85
To Next Page
Loading...
