CONTROL SYSTEM
01–40–28
*
: Charging efficiency is ratio of actual intake air amount to maximum air charging amount (mass volume) of
cylinder. This value increases proportionately to the increase in engine load.
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.
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EVAPORATIVE PURGE CONTROL OUTLINE [LF]
E5U014000000N37
• An appropriate amount of evaporative gas is fed into the dynamic chamber by the driving of the purge solenoid
valve according to the engine operation conditions to ensure driveability and prevent release of evaporative gas
into the atmosphere.
• The PCM determines the engine operation conditions based on the signals from the input devices indicated in
the figure below to drive the purge solenoid valve. For the construction/operation of the purge solenoid valve,
refer to “EMISSION SYSTEM, PURGE SOLENOID VALVE, CONSTRUCTION/OPERATION”.
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Correction
Engine coolant
temperature
advance
correction
Purpose: Ensures combustion stability when engine coolant temperature is
low
Except during idling
• High charging efficiency
*
, low engine coolant temperature→large
correction
BB
Warm-up
promotion spark
retard
correction
Purpose: Activates the catalytic converter earlier
Approx. 50 s after engine start
• According to engine coolant temperature→correction
B
Feedback
correction
Purpose: Ensures idling stability
During 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
EGR correction Purpose: Prevents deviation of required ignition timing during EGR gas feed
When EGR valve position is the specified value or more except
during EGR valve initialization
• According to engine speed and charging efficiency
*
→correction
B
Shift spark
retard/ advance
corrections (AT)
Purpose: Reduce shift shock during upshifting or manual downshifting.
Determined according to torque reduction/increase request
signals from the TCM.
• Large torque reduction request during upshifting→large spark retard
correction
• Large torque increase request during manual downshifting→large spark
advance correction
B
Deceleration
fuel cut
recovery retard
correction
Purpose: Reduces shock after recovery from deceleration fuel cut and during
re-acceleration while in deceleration fuel cut
Re-acceleration after recovery from deceleration fuel cut and
while in deceleration fuel cut
• Low engine coolant temperature→large correction
BB
Acceleration
spark retard
correction
Purpose: Prevents knocking and shock during sudden acceleration
Acceleration when charging efficiency
*
volume increase
(acceleration amount) is specified value or more
• High acceleration amount→high retard
B
Standing start
spark retard
correction
Purpose: Prevents shock when vehicle accelerates from a standing start
When vehicle accelerates from a standing start
• According to engine speed, throttle valve opening angle, engine coolant
temperature and intake air temperature→correction
B
Knocking spark
retard
correction
Purpose: Knocking suppression
When knocking is detected while driving under high load
• Large amount of knocking→large correction
B
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