2008 MITSUBISHI LANCER EVOLUTION X engine

FUEL INJECTION CONTROL
MULTIPORT FUEL SYSTEM (MFI)13A-34
[Injector drive time compensation]
After calculating the injector basic drive time, the ECM makes
the following compensations to control the optimum fuel injec
-
tion volume according to driving conditions.
List of main compensations for fuel injection control
.
[Fuel limit control during deceleration]
ECM limits fuel when decelerating downhill to prevent exces-
sive rise of catalytic converter temperature and to improve fuel
efficiency.
.
[Fuel-cut control when over-run]
When engine speed exceeds a prescribed limit (6,600 r/min),
ECM cuts fuel supply to prevent overrunning and thus protect
the engine. Also, if engine speed exceeds 4,000 r/min for 15
seconds while vehicle is stationary (no load), it cuts fuel supply
and controls the throttle valve opening angle to protect the
engine.
CompensationsContent
Heated oxygen sensor feedback compensationThe heated oxygen sensor signal is used for
making the compensation to get air-fuel ratio with
best cleaning efficiency of the 3-way catalytic
converter. This compensation might not be made
sometimes in order to improve drivability,
depending on driving conditions. (Air-fuel ratio
compensation is made.)
Air-fuel ratio compensationUnder driving conditions where heated oxygen
sensor feedback compensation is not performed,
compensation is made based on pre-set map
values that vary according to engine speed and
intake air volume.
Engine coolant temperature compensationCompensation is made according to the engine
coolant temperature. The lower the engine coolant
temperature, the greater the fuel injection volume.
Acceleration/ Deceleration compensationCompensation is made according to change in
intake air volume. During acceleration, fuel injection
volume is increased. Also, during deceleration, fuel
injection volume is decreased.
Fuel injection compensationCompensation is made according to the pressure
difference between atmospheric pressure and
manifold absolute pressure. The greater the
difference in pressure, the shorter the injector drive
time.
Battery voltage compensationCompensation is made depending on battery
voltage. The lower the battery voltage, the greater
the injector drive signal time.
Learning value for fuel compensationCompensation amount is learned to compensate
feedback of heated oxygen sensor. This allows
system to compensate in accordance with engine
characteristics.

IGNITION TIMING AND CONTROL FOR CURRENT CARRYING TIME
MULTIPORT FUEL SYSTEM (MFI)13A-35
IGNITION TIMING AND CONTROL FOR CURRENT
CARRYING TIME
M2132027100089
Ignition timing is pre-set according to engine driving
conditions. Compensations are made according to
pre-set values depending on conditions such as
engine coolant temperature, battery voltage etc. to
decide optimum ignition timing. Primary current con
-
nect/disconnect signal is sent to the power transistor
to control ignition timing. Ignition is done in sequence
of cylinders 1, 3, 4, 2.
System Configuration Diagram
AK502722AD
ECM MFI relay
Spark plugs Ignition
coils
Cylinder No. 1 2 3 4Battery
Mass airflow sensor
Intake air temperature sensor
Manifold absolute
pressure sensor
Engine coolant
temperature sensor
Intake camshaft position sensor
Exhaust camshaft position sensor
Crankshaft position sensor
Knock sensor
Ignition switch-ST Throttle position sensor

IGNITION TIMING AND CONTROL FOR CURRENT CARRYING TIME
MULTIPORT FUEL SYSTEM (MFI)13A-37
2. Spark-advance control and current carrying
time control
.
[During start]
ECM initiates ignition at fixed ignition timing (5° BTDC) syn-
chronized with the crankshaft position sensor signal.
.
[During normal operation]
After determining the basic spark-advance based on the intake
air volume and engine speed, ECM makes compensations
based on input from various sensors to control the optimum
spark-advance and current carrying time.
List of main compensations for spark-advance control and current carrying time control
.
[Control for checking ignition timing]
During basic ignition timing set mode for M.U.T.-III actuator test
function, sparking is done with fixed ignition timing (5
° BTDC)
synchronized with crankshaft position sensor signal.
CompensationsContent
Intake air temperature compensationCompensation is made according to intake air
temperature. The higher the intake air temperature
the greater the delay in ignition timing.
Engine coolant temperature compensationCompensation is made according to engine coolant
temperature. The lower the engine coolant
temperature the greater the advance in ignition
timing.
Knocking compensationCompensation is made according to generation of
knocking. The greater the knocking the greater the
delay in ignition timing.
Stable idle compensationCompensation is made according to change in idle
speed. In case engine speed becomes lower than
target speed, ignition timing is advanced.
Delay compensation when changing shiftDuring change of shift, sparking is delayed
compared to normal ignition timing to reduce
engine output torque and absorb the shock of the
shift change.
Battery voltage compensationCompensation is made depending on battery
voltage. The lower the battery voltage the greater
the current carrying time and when battery voltage
is high current carrying time is shortened.

THROTTLE VALVE OPENING ANGLE CONTROL AND IDLE SPEED CONTROL
MULTIPORT FUEL SYSTEM (MFI)13A-38
THROTTLE VALVE OPENING ANGLE CONTROL AND IDLE
SPEED CONTROL
M2132003500328
ECM detects the amount of accelerator pedal
depression (as per operator's intention) through the
accelerator pedal position sensor. Based on pre-set
basic target opening angles it adds various compen
-
sations and controls the throttle valve opening angle
according to the target opening angle.
While starting
ECM adds various compensations to the target
opening angle that are set based on the engine cool
-
ant temperature, so that the air volume is optimum
for starting.
While idling
ECM controls the throttle valve to achieve the target
opening angle that are set based on the engine cool
-
ant temperature. In this way best idle operation is
achieved when engine is cold and when it is hot.
Also, the following compensations ensure optimum
control.
While driving
Compensations are made to the target opening
angle set according to the accelerator pedal opening
angle and engine speed to control the throttle valve
opening angle.
AK602236AE
Throttle
position
sensorMain
Main Sub
SubMotor drive circuit
A/C switch (CAN) Engine coolant
temperature sensor
Intake air temperature
sensor
Crankshaft position sensor
Power steering pressure
switch
Generator FR terminal
Transmission range
switch (CAN) Motor drive power supply
(From throttle actuator
control motor relay)
Throttle actuator
control motor
Control unit
Barometric pressure
sensor Accelerator
pedal position
sensor
ECM

THROTTLE VALVE OPENING ANGLE CONTROL AND IDLE SPEED CONTROL
MULTIPORT FUEL SYSTEM (MFI)13A-39
List of main compensations for throttle valve opening angle and idle speed control
Initialize control
After ignition switch turns OFF, ECM drives the throt-
tle valve from fully closed position to fully open posi-
tion and records the fully closed/open studied value
of the throttle position sensor (main and sub) output
signals. The recorded studied values are used as
studied value compensation for compensating basic
target opening angle when the engine is started next.
CompensationsContent
Stable idle compensation (immediately after start)In order to stabilize idle speed immediately after
start, target opening angle is kept big and then
gradually reduced. Compensation values are set
based on the engine coolant temperature.
Rotation speed feedback compensation (while
idling)In case there is a difference between the target idle
speed and actual engine speed, ECM
compensates the throttle valve opening angle
based on that difference.
Atmospheric pressure compensationAt high altitudes atmospheric pressure is less and
the intake air density is low. So, the target opening
angle is compensated based on atmospheric
pressure.
Engine coolant temperature compensationCompensation is made according to the engine
coolant temperature. The lower the engine coolant
temperature the greater the throttle valve opening
angle.
Electric load compensationThrottle valve opening angle is compensated
according to electric load. The greater the electric
load, the greater the throttle valve opening angle.
Compensation when shift is in D range When transmission is changed from P or N range
to some other range, throttle valve opening angle is
increased to prevent reduction in engine speed.
Compensation when A/C is functioningThrottle valve opening angle is compensated
according to functioning of A/C compressor. While
A/C compressor is being driven, the throttle valve
opening angle is increased.
Power steering fluid pressure compensationThrottle valve opening angle is compensated
according to power steering functioning. When
power steering oil pressure rises and power
steering pressure switch is ON, the throttle valve
opening angle is increased.

MIVEC (Mitsubishi Innovative Valve Timing Electronic Control System)
MULTIPORT FUEL SYSTEM (MFI)13A-40
MIVEC (Mitsubishi Innovative Valve Timing Electronic
Control System)
M2132023500212
MIVEC is the system which continuously varies and
controls the opening and closing timings of the intake
valve and the exhaust valve.
System Configuration Diagram
MIVEC allows the optimum valve timing to be con-
trolled in accordance with the engine operation and
the idling stability to be improved, as well as the out
-
put and the torque to be better in all the operation
ranges.
•The ECM assesses the engine operation through
the signals from each sensor.
•Based on the assessed information, the ECM
sends the duty signal to the intake engine oil con
-
trol valve and exhaust engine oil control valve as
well as controls the spool valve position.
•Changing the spool valve position allows the oil
pressure to be divided into the retarded chamber
and the advanced chamber, as well as allows the
phases of the intake camshaft and the exhaust
camshaft to be continuously changed.
AK604826AB
Crankshaft
position sensor
Manifold absolute
pressure sensor
Intake camshaft
position sensorECMSpool valve
To oil pan
To oil pan Oil pressureAdvance direction Spool valve movementRetard direction Intake engine oil control valve
Retard chamber
Advance chamber
Spring
Crankshaft
position sensor
Manifold absolute
pressure sensor
Exhaust camshaft
position sensorECMSpool valve
To oil pan
To oil pan Oil pressureRetard direction Spool valve movementAdvance direction Exhaust engine oil control valve
Advance chamber
Retard chamber
Spring

MIVEC (Mitsubishi Innovative Valve Timing Electronic Control System)
MULTIPORT FUEL SYSTEM (MFI)13A-42
The detected phase angle is calculated using the cam position sensor signal.
AK604129AB
Overlap: nothing
small Exhaust valveIntake valveExhaust valveIntake valve
(initial position)
Exhaust valve
(initial position: most advance)
Intake valve
(initial position: most retard)Exhaust valveIntake valve
Initial position
Overlap: large Initial position
Crank angle Crank angle
Crank angle Crank angle Valve lift amount Valve lift amountValve lift amount Valve lift amount
LoadHigh output High torque
Middle load range
Low load range at
low speedHigh load range at
low and middle speedsHigh load range at
high speed
Engine speed
Low-fuel consumptionLow-fuel consumption

MIVEC (Mitsubishi Innovative Valve Timing Electronic Control System)
MULTIPORT FUEL SYSTEM (MFI)13A-44
Within range of low
speed and high load
at accelerationAdvancing closing timing of
intake valve allows amount
of intake air flowing back
into intake port to be limited
as well as allows
volumetric efficiency to be
improved, resulting in low
and middle speed torques
improved.Low and middle speed
torques improved
Within range of
middle speed and
middle loadIncreasing overlap amount
allows pumping loss to be
decreased. Retarding
opening timing of exhaust
valve allows burned gas to
work sufficiently and allows
cycle efficiency to be
improved, resulting in
higher expansion ratio.Fuel economy
improved
Within range of high
speed and high loadRetarding closing timing of
intake valve in accordance
with engine speed allows
valve timing to be
controlled according to
inertia force of intake air
and allows volumetric
efficiency to be improved.Output improved
Operation condition Valve timing Operation Effectiveness
AK604131AB
TDC
BDC Exhaust valveIntake valve
Open
Close
AK604132AB
TDC
BDC Exhaust valve
Intake valve Overlap:
large
Open
AK604133
TDC
BDC
AB
Exhaust valveIntake valve
Close