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Mitsubishi Galant (2004+). Manual - part 1716
AUTO-CRUISE CONTROL SYSTEM
ENGINE AND EMISSION CONTROL
17-5
CONSTRUCTION AND OPERATION
M2170002000027
SYSTEM OUTLINE
The PCM calculates the cruise control operation sta-
tus when the control section of the cruise control
inside the PCM receives the input signals of the
auto-cruise control switch, vehicle speed, and cancel
system (stoplight switch and transmission range
switch). To the engine control section it sends the tar-
get accelerator angle value for cruise control, to the
A/T control section it issues a command to cancel
OD, and to the gauge it issues an ON/OFF command
for the auto-cruise control indicator light.
In the engine control section, the target throttle angle
value is calculated from the target acceleration value
for cruise control and the actual accelerator angle
value, and the vehicle speed is controlled by apply-
ing the throttle actuator control motor.
BLOCK DIAGRAM
SYSTEM FUNCTIONS
"COAST/SET" SWITCH FUNCTION
.
SET
The vehicle speed at the moment the "COAST/SET"
switch was switched from OFF to ON while driving
within the limit vehicle speed range is memorized as
the "set vehicle speed" and thereafter the throttle
actuator control motor is controlled so that
fixed-speed driving at that speed is possible.
However, if the vehicle speed is set at 200 km/h (124
mph) or higher, the speed of 200 km/h (124 mph) is
saved as the vehicle speed, but if the vehicle speed
is set above 205 km/h (127 mph), the vehicle will not
reach the specified speed.
.
COAST
While the "COAST/SET" switch is held ON during
auto-cruise driving, the vehicle keeps decelerating. If
the "COAST/SET" switch is turned OFF before the
vehicle speed decreases to 40 km/h (25 mph), the
vehicle runs at the fixed speed at the moment the
switch is turned OFF. If the "COAST/SET" switch is
turned OFF after the vehicle speed decreases to less
than 40 km/h (25 mph), the auto-cruise control is
cancelled.
However if the "COAST/SET" switch has been ON
for 0.5 second or less, a tap-down operation is per-
formed [decelerating from the current speed by 1.6
km/h (1 mph)]; at over 0.5 second, continuous decel-
eration is performed.
CANCEL SYSTEM
(STOPLIGHT SWITCH,
TRANSMISSION RANGE SWITCH)
AUTO-CRUISE
CONTROL SWITCH
AUTOMATIC
TRANSAXLE
"CRUISE" INDICATOR
LIGHT
PCM
THROTTLE ACTUATOR
CONTROL MOTOR
TARGET ACCELERATOR
PEDAL OPENING
ANGLE
ENGINE CONTROL SECTION
CRUISE CONTROL SECTION
AC206197
VEHICLE
SPEED
ACTUAL ACCELERATOR
PEDAL OPENING ANGLE
A/T CONTROL SECTION
OVERDRIVE OFF CONTROL
TARGET THROTTLE
VALVE OPENING
ANGLE