Mitsubishi Galant 9G. Manual - part 482

GENERAL DESCRIPTION

TSB Revision

AUTOMATIC TRANSAXLE

23A-6

SECTIONAL VIEW <F4A5A>

AC211841AC

1

2

3

4

5

6

7 8

9

19

11

12

13

14

15

16

17

18

10

1. OVERDRIVE 

CLUTCH

2. REVERSE 

CLUTCH

3. OVERDRIVE 

PLANETARY 

CARRIER

4. SECOND 

BRAKE

5. LOW-REVERSE 

BRAKE

6. OUTPUT 

PLANETARY 

CARRIER

7. ONE-WAY 

CLUTCH

8. TRANSFER 

DRIVE 

GEAR

9. UNDERDRIVE 

CLUTCH

10. TRANSAXLE CASE

11. TORQUE CONVERTER
12. TORQUE CONVERTER CLUTCH
13. INPUT SHAFT
14. OIL PUMP
15. TORQUE CONVERTER HOUSING
16. DIFFERENTIAL
17. TRANSFER DRIVEN GEAR
18. OUTPUT SHAFT
19. REAR COVER

GENERAL DESCRIPTION

TSB Revision

AUTOMATIC TRANSAXLE

23A-7

ELECTRONICALLY-CONTROLLED SYSTEM

.

INVECS-II

• When in drive ("D" range), the new automatic transaxle 

employs an innovative shift schedule to provide a high level 
of comfort and "easy driving style" that matches all driving 
conditions as well as the driver's driving style.

• INVECS-II features "Optimum Shift Control," which provides 

shift timing the average driver perceives to be the optimum 
timing under any road conditions. "Adaptive Shift Control" 
adjusts shift timing to match the driving habits and prefer-
ences of individual drivers.

.

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, tire 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.

AC000841AB

WITH INVECS-II

WITHOUT
INVECS-II

OPTIMUM SELECTION OF GEARS

LEVEL ROAD

ALL DRIVING CONDITIONS

DRIVER'S HABITS AND
PREFERENCE

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

GENERAL DESCRIPTION

TSB Revision

AUTOMATIC TRANSAXLE

23A-8

3. If the computer determines that the driver tends 

to apply the brakes often on a descending road-
way, it adjusts timing to down shift sooner so that 
engine braking is more effectively applied. Con-
versely, if the computer determines that the driver 
does not brake much while driving downhill, it 
delays downshifting to minimize the effect of 
engine braking.

.

AC000844

DRIVER WHO PREFERS
RELAXING RIDE

DRIVER WHO PREFERS
SPORTIER RIDE

50 (31)

4TH

3RD

100 (62)

VEHICLE SPEED [km/h (mph)]

ADAPTIVE SHIFT CONTROL DURING ACCELERATION

AB

4TH

3RD

AC000845

DRIVER WHO PRESSES
BRAKE PEDAL OFTEN

AVERAGE DRIVER

4TH

3RD

ADAPTIVE SHIFT CONTROL ON DOWNGRADES

AB

4TH

3RD

4TH

4TH

4TH

4TH

3RD

2ND

DRIVER WHO RARELY
PRESSES THE BRAKE

CONVENTIONAL A/T (NO DOWN SHIFT)

NEW A/T WITH
INVECS-II

GENERAL DESCRIPTION

TSB Revision

AUTOMATIC TRANSAXLE

23A-9

SYSTEM CONSTRUCTION DIAGRAM

Powertrain control module (PCM)

Ignition switch

Input shaft speed sensor

Output shaft speed sensor

Crankshaft position sensor

Throttle position sensor 

A/T fluid temperature sensor

Park/Neutral position switch

Dual pressure switch

Stoplight switch

Cruise control unit (OD OFF Signal)

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

AC102750

Transmission fluid temperature sensor

Transmission range switch

AE

Scan tool (MUT-III)

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