Mitsubishi Galant. Manual — part 385

GENERAL DESCRIPTION

TSB Revision

AUTOMATIC TRANSAXLE

23A-7

<F4A51>

AC004893AB

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1. REVERSE CLUTCH

2. OVERDRIVE PLANETARY CARRIER

3. SECOND BRAKE

4. LOW-REVERSE BRAKE

5. OUTPUT PLANETARY CARRIER

6. ONE-WAY CLUTCH

7. TRANSFER DRIVE GEAR

8. TRANSAXLE CASE

9. UNDERDRIVE CLUTCH

10. TORQUE CONVERTER

11. TORQUE CONVERTER CLUTCH

12. INPUT SHAFT

13. OIL PUMP

14. TORQUE CONVERTER HOUSING

15. DIFFERENTIAL

16. TRANSFER DRIVEN GEAR
17. OUTPUT SHAFT
18. REAR COVER
19. OVERDRIVE CLUTCH

GENERAL DESCRIPTION

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AUTOMATIC TRANSAXLE

23A-8

ELECTRONICALLY-CONTROLLED SYSTEM

INVECS-II

•

When in drive ("D" range), the new automatic transmission
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, and "Adaptive
Shift Control", which adjusts shift timing to match the driving
habits and preferences 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 in control technologies with an

innovative 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 regarding road and operating conditions, and
instantly makes accurate shift control decisions.

ADAPTIVE SHIFT CONTROL

1. The computer learns the driving habits and

preferences 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

patterns 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 computer 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

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AUTOMATIC TRANSAXLE

23A-9

3. If the computer determines that the driver tends

to apply the brakes often on a descending
roadway, it adjusts timing to shift down sooner so
that the engine brake is more effectively applied.
Conversely, if the computer determines that the
driver does not brake much while driving
downhill, it delays downshifting to limit the effect
of the engine brake.

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 PRESSED
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

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AUTOMATIC TRANSAXLE

23A-10

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 fruid temperature sensor

Park/Neutral position switch

Vehicle speed sensor

Dual pressure switch

Stoplight switch

Cruise cntrol unit (OD OFF Signal)

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

SENSE

DECIDE

ACT

AC003077AB