Mitsubishi 380. Manual — part 367

GENERAL DESCRIPTION

AUTOMATIC TRANSMISSION

23A-8

FEATURES

OPTIMUM SHIFT CONTROL

1. The shift patterns found satisfying by the typical driver for all

ranges of driving are stored in the computer's memory. The
computer uses this data to analyze road conditions and the
driver's style of operation, and then outputs the optimal shift
patterns stored in its memory to best match the conditions.

2. We introduce the latest control technologies with an innova-

tive new algorithm called the "neural network" that works to
imitate the decision-making processes of the human brain.
The neural network links a wide variety of input data regard-
ing road and operating conditions, and instantly makes
accurate shift control decisions.

.

ADAPTIVE SHIFT CONTROL

1. The computer learns the driving habits and pref-

erences of each individual driver by processing
driving data on engine output, tyre load, foot
brake operation, etc. It then uses this data to
adjust shift timing to best suit the driver's style.

2. If the computer determines from the driving pat-

terns that the driver is one who enjoys a relaxed,
unhurried style, it adjusts timing to execute
up-shifts at a lower engine speed to provide a
smooth, quiet ride. On the other hand, if the com-
puter determines the driver to prefer a sporty ride,
it adjusts timing to shift up at a higher engine
speed to provide more powerful response.

.

AC000842

ACCELERATOR
POSITION

VEHICLE SPEED

FOOT BRAKE

OPTIMUM
GEAR
SELECTION

MANUAL SHIFT
OPERATION
DATA OF A
NUMBER
DRIVER'S

DECISION

ROAD
CONDITION
AND DRIVING
OPERATION

COMPUTER

OPTIMUM CONTROL

AB

AC000843

ACCELERATOR
POSITION

VEHICLE SPEED

FOOT BRAKE

OPTIMUM
GEAR
SELECTION

DATA
PROCESSED

INTERRE-
LATED

DECI-
SION

COMPUTER

NEURAL NETWORK

AB

10DB078A

DRIVER WHO PREFERS
RELAXING RIDE

DRIVER WHO PREFERS
SPORTIER RIDE

50

4TH

5TH

100

VEHICLE SPEED [km/h]

ADAPTIVE SHIFT CONTROL DURING ACCELERATION

4TH

5TH

GENERAL DESCRIPTION

AUTOMATIC TRANSMISSION

23A-9

SYSTEM CONSTRUCTION DIAGRAM

Automatic Transmission -

Electronic Control Unit

(A/T-ECU)

Ignition switch

Input shaft speed sensor

Output shaft speed sensor

A/T fluid temperature sensor

Park/Neutral position switch

Select switch
<Vehicles with sport mode>

Shift switch (up, down)
<Vehicles with sport mode>

Scan tool (MUT-II)

Serial communication

A/T control relay

Torque converter clutch solenoid valve

Low-reverse solenoid valve

Second solenoid valve

Underdrive solenoid valve

Overdrive solenoid valve

Fail-safe operation
("N" range light flashing)
<Vehicles with sport mode>

SENSE

DECIDE

ACT

10DB080A

Transmission fluid temperature sensor

Transmission range switch

Diagnostic tool (MUT-III)

Fail-safe operation
(''N'' range light flashing)

Reduction solenoid valve

GENERAL DESCRIPTION

AUTOMATIC TRANSMISSION

23A-10

SHIFT PATTERN CONTROL

.

UPSHIFT PATTERN <F5A5A>

.

DOWNSHIFT PATTERN <F5A5A>

NOTE: INVECS does not function on downshift.

10DB157A

THROTTLE

OPENING (%)

OUTPUT SHAFT SPEED r/min

THICK LINE: STANDARD SHIFT PATTERN

10DB158A

THROTTLE

OPENING (%)

OUTPUT SHAFT SPEED r/min

THICK LINE: STANDARD SHIFT PATTERN

GENERAL DESCRIPTION

AUTOMATIC TRANSMISSION

23A-11

TORQUE CONVERTER CLUTCH CONTROL

.

5TH GEAR RANGE <F5A5A>

.

4TH GEAR RANGE <F5A5A>

10DB159A

50

0

1,000

2,000

3,000

4,000

5,000

6,000

7,000

100

0 (0)

50 (31)

100 (62)

150 (93)

THROTTLE

OPENING (%)

VEHICLE SPEED km/h (mph)

OUTPUT SHAFT SPEED r/min

LOCK-UP

DISENGAGED

PARTIAL

LOCK-UP

ZONE

200 (124)

4

5

4

5

ON/OFF

10DB160A

50

0

1,000

2,000

3,000

4,000

5,000

6,000

7,000

100

0.5

1.0

2.0

3.0

4.0

4.5

0 50

100

150

THROTTLE

OPENING

VOLTAGE (V)

THROTTLE

OPENING (%)

VEHICLE SPEED km/h

OUTPUT SHAFT SPEED r/min

LOCK-UP

DISENGAGED

PARTIAL

LOCK-UP

ZONE

200

4

5

3

4

3

4