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Mazda CX-5 Service & Repair Manual: Electronic Spark Advance Control [Skyactiv G 2.0]

Mazda CX-5 Service & Repair Manual / Electrical / Ignition / Electronic Spark Advance Control [Skyactiv G 2.0]

Outline

Block Diagram


Operation

Ignition method

Timing chart


Determination of Ignition Timing



Control zone

Control condition

Ignition method

Engine start

Engine speed is less than 500 rpm

Engine starting

Idle zone

Accelerator pedal not depressed

(Cycle estimated ignition) (Determines ignition timing adding each correction to idle spark advance)

Normal zone

Engine operation except start and idling zones

(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

Idle spark advance

Set value according to target speed and charging efficiency*

A

Basic spark advance

Set value according to engine speed and charging efficiency*

A

Correction

Engine coolant temperature spark advance correction

Purpose: Ensures combustion stability when engine coolant temperature is low

    According to engine coolant temperature

  • High charging efficiency*, low engine coolant temperature>large correction

B

B

Intake air temperature correction

Purpose: Suppresses knocking when engine intake air temperature is high

    According to engine intake air temperature and engine coolant temperature

  • High engine intake air temperature, high engine intake air temperature>large correction

B

Warm-up promotion spark retard correction

Purpose: Activates the catalytic converter earlier

    Maximum 50 s after engine start

  • According to engine coolant temperature>correction

B

Idle speed feedback correction

Purpose: Ensures idling stability

    While idling (inhibited during test mode)

  • Large difference between actual engine speed and target engine speed>large correction

  • Small difference between actual engine speed and target engine speed>small correction

B

Torque reduction correction

Purpose: Such as reduction of shift shock, traction control, or suppression of vehicle vibration

    According to torque reduction request from PCM, TCM, or DSC

  • Large torque reduction request>large correction

B

Deceleration fuel cut recovery retard correction

Purpose: Reduces shock during recovery from deceleration fuel cut

    Recovery from deceleration fuel cut

  • Correction according to time since fuel cut recovery

B

B

Knocking spark retard correction

Purpose: Knocking suppression

    Acceleration when charging efficiency* volume increase (acceleration amount) is given value or more

  • Large acceleration amount>large correction

B

Valve timing correction

Purpose: Ensures combustion stability

    When phase difference changes due to electric variable valve timing control and variable valve timing control

  • Correction according to change in phase difference

B


* Charging efficiency is the ratio of the actual amount of intake air to the maximum air charging amount (mass volume) of the cylinder. This value increases proportionately to the increase in engine load.

Ignition
...

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