ELECTRONIC SPARK ADVANCE OPERATION [LF]
B3E014018881T27
Ignition method
• The PCM excites the ignition coils employing either fixed ignition or cycle estimated ignition according to engine operation conditions.
Timing chart
1
|
CMP sensor input
|
2
|
CKP sensor input
|
3
|
Cylinder number
|
4
|
Intake air
|
5
|
Exhaust air
|
6
|
Expansion
|
7
|
Compression
|
8
|
Ignition coil energization allowance period
|
Determination of Ignition Timing
Division of control zones
• The PCM divides the engine control operations into each control zone according to the engine speed and throttle valve opening angle to determine the ignition timing by each of the control zones to perform optimum ignition control under all engine operation conditions.
1
|
Throttle valve position
|
2
|
Engine speed
|
3
|
Start zone
|
4
|
Regular zone
|
5
|
Idle zone
|
6
|
Open
|
7
|
Closed
|
8
|
Low
|
9
|
High
|
Ignition timing calculation method table
A: Ignition timing base, B: Correction for ignition timing
Ignition inhibition condition
• When receiving an engine stop request signal from the immobilizer system, the PCM force-stops control of ignition coils. As a result, the engine does not start.