id0140q1188200
Outline
Block Diagram
am2zzn00003416
|
Operation
Ignition method
Timing chart
am2zzn00003417
|
Determination of ignition timing
| Control zone |
Control condition |
Ignition method |
|---|---|---|
|
Engine start zone
|
Engine speed is
less than 500 rpm
|
Engine starting
|
|
Normal zone
|
Engine operation except start zone
|
Cycle estimated ignition (Determines ignition timing adding each correction to basic spark advance)
|
Ignition timing calculation method table
A: Ignition timing base, B: Correction for ignition timing
|
Contents
|
Calculation method or determination method for ignition timing, spark advance, and correction
|
Control zone
|
||
|
|
|||
|
Starting ignition
|
Determination based on engine coolant temperature
|
A
|
|
|
|
Cycle estimated ignition
|
Basic spark advance
|
Set value according to engine speed, charging efficiency
*1, and EGR rate
*2
|
|
A
|
|
Correction
|
Engine coolant temperature spark advance correction
|
According to engine coolant temperature
Purpose: Ensures combustion stability when engine coolant temperature is low
• High charging efficiency
*, low engine coolant temperature→large correction
|
|
B
|
|
Intake air temperature correction
|
According to engine intake air temperature and engine coolant temperature
Purpose: Suppresses knocking when engine intake air temperature is high
• High engine intake air temperature, high engine intake air temperature→large correction
|
|
B
|
|
|
Warm-up promotion spark retard correction
|
Maximum 50 s after engine start
Purpose: Activates the catalytic converter earlier
• According to engine coolant temperature→correction
|
|
B
|
|
|
Torque reduction correction
|
According to torque reduction request from TCM, or DSC HU/CM
Purpose: Such as reduction of shift shock, traction control, or suppression of vehicle vibration
• Large torque reduction request→large correction
|
|
B
|
|
|
Knocking spark retard correction
|
Acceleration when charging efficiency
* volume increase (acceleration amount) is given value or more
Purpose: Knocking suppression
• Large acceleration amount→large correction
|
|
B
|
|
|
Valve timing correction
|
When phase difference changes due to electric variable valve timing control (SKYACTIV-G 1.5) and hydraulic variable valve timing control
Purpose: Ensures combustion stability
• Correction according to change in phase difference
|
|
B
|
|
|
Swirl control valve position correction
|
Purpose: Correction is performed because combustion speed changes according to swirl control valve opening angle.
|
|
B
|
|