Alfa Romeo MiTo
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Alfa Romeo MiTo Alfa TCT is a three-shaft transmission that can transmit a maximum torque of 350 Nm. The transmission features two dry clutches that are operated by two separate hydraulic actuators. The Alfa TCT has six synchronised gears, a three-shaft layout, and a dedicated TCU. The system is controlled by an electrohydraulic unit and an electronic control unit.
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Parking request with vehicle moving:
The mechanical lock will not be engaged if the lever is positioned at P at speeds other than 0 km/h. The system shifts to neutral and the lever remains locked in P. The gearbox control unit must send the “Lever release request” on CAN to release the lever.
Launch Control strategy
The launch strategy can be activated in Dynamic mode and speed = 0 km/h:
1. To arm launch control:
a. press the brake pedal without releasing it b. press the accelerator pedal without releasing it (even partially) c. tip DOWN (“-“) with paddle only if lever is in D position or from paddle or lever with lever in TIP position.
2. For launching (after arming the strategy):
a. release the brake pedal holding the accelerator pedal pressed
3. For aborting launch (after arming the strategy):
a. release the accelerator pedal.
System safety functions
Vehicle stationary, engine running, gear engaged (typically 1st or R)
Press the brake pedal and/or accelerator, then open the driver door: the system keeps the current gear. The instrument panel will continue to display mode, logic current gear.
The buzzer will always sound when the door is open, the key is on, the engine is running and the lever is not in P.
Vehicle stationary, engine running, gear engaged (typically 1st or R)
Do NOT press the brake pedal or the accelerator pedal, then open the driver's door: the buzzer will sound for 5 seconds if the lever is in position other than P (even if the brake pedal is pressed).
Currently, the buzzer will always sound when the door is open, the key is on, the engine is running and the lever is not in P.
if creeping is off (e.g. handbrake applied or creeping recovery mode):
• the system engages N (neutral) after approximately 1.5 sec.
• The instrument panel will continue to display mode, logic and N.
Since the lever may be at D/TIP or R, the shift to N (neutral) operated by the system will create an inconsistency between lever position and engaged gear. Therefore, the buzzer will sound. the buzzer will continue until consistency is restored.
(To engage 1st gear again (with the lever in D/TIP) the steering wheel paddles may also be used, with the brake pressed).
NOTE: the buzzer is used whenever N is engaged automatically.
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Vehicle stationary, engine running, gear engaged (typically 1st or R)
Wait for longer than 3 minutes before starting any operation. In other words, do not press the brake pedal or the accelerator and do not shift the lever (e.g. when standing at a traffic light):
if creeping is off (e.g. handbrake applied or creeping recovery mode):
• the system independently selects N (neutral).
• The instrument panel will continue to display mode, logic and N.
Since the lever may be at TIP or R, the shift to N (neutral) operated by the system will create an inconsistency between lever position and engaged gear. Therefore, the buzzer will sound. the buzzer will continue until consistency is restored.
Vehicle stationary, engine running, gear engaged (typically 1st or R)
Keep the brake pedal pressed without operating (standing) for longer than 10 minutes:
• the system independently selects N (neutral).
• The instrument panel will continue to display mode, logic and N.
Since the lever may be at TIP or R, the shift to N (neutral) operated by the system will create an inconsistency between lever position and engaged gear. Therefore, the buzzer will sound. the buzzer will continue until consistency is restored.
Vehicle stationary, engine running, gearbox in neutral (lever in at P): key-off procedure
Turn the engine off:
P will blink on the display and the buzzer will sound indicating that the vehicle is about to be left with the lever not in P: P will blink and the buzzer will sound for approximately 5 seconds (controlled by the gearbox lever).
The buzzer and blinking will last for 5 seconds. After 5 seconds, the systems go to power-off. If the lever is not moved to P within 5 seconds, the key will remain locked after power-off. The Parking function is only mechanical and can therefore be engaged even after 5 seconds. The lever will remain locked after it is placed at P.
Vehicle stationary, engine running, lever at P): key-off procedure
Turn the engine off:
no gearbox information will be displayed and the buzzer will not sound.
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Manually releasing the lever
In an emergency (breakdown, flat battery, etc.) the lever can be moved from position P using the lever under the boot, on the left side, as shown in fig. 68.
Fig. 68
Remember that the starter key (if inserted) will remain locked if the battery is flat. The key may be extracted mechanically by inserting a screwdriver in the hole under the dashboard (Fig. 69) and pressing slightly to extract the key.
Fig. 69
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Summary of messages sent by TCT to instrument panel
EVENT CONTROL
WARNING MESSAGE BUZZER
Lever position-
Lever inconsistency may be due to the impossibility to engage a requested gear or caused by inconsistency automatic safety neutral selection procedures no yes
Manual shift
UP/DOWN not accepted
Door open with engine running and lever not in P
R engaged
Request to engage
2nd gear from stationary with engine running no no no
Yes
NOT ALLOWED yes yes yes yes
D->R R->D request while moving not allowed
Automatic neutral selection if shift request is over an acceptable speed threshold for a maximum timeout
Yes
NOT ALLOWED
Clutch overheating
Manual recovery deactivation
Manual recovery deactivation yes
Yes
OVERHEATED CLUTCH yes
Yes no
AVAILABLE
Yes
AUTOMATIC MODE NOT
AVAILABLE no
Gear request not available
Yes
GEAR REQUEST NOT
AVAILABLE yes
- 80 - Alfa TCT
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Key Features
- Three-shaft transmission
- Maximum torque of 350 Nm
- Two dry clutches
- Six synchronised gears
- Dedicated TCU
- Electrohydraulic unit
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Frequently Answers and Questions
What is the maximum torque that the Alfa TCT transmission can transmit?
How many gears does the Alfa TCT transmission have?
What type of clutches are used in the Alfa TCT transmission?
What controls the Alfa TCT transmission?
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Table of contents
- 7 INTRODUCTION
- 8 OPERATION OVERVIEW
- 10 ALFA TCT TRANSMISSION FEATURES
- 12 GEARBOX STRUCTURE
- 16 ALFA TCT OPERATING PRINCIPLES - MECHANICAL PART
- 17 CLUTCHES
- 22 EVEN GEAR CSC
- 23 ODD GEAR CSC
- 25 UPPER LAYSHAFT
- 27 LOWER LAYSHAFT
- 30 GEAR ENGAGEMENT RODS
- 31 DIFFERENTIAL
- 32 ELECTROHYDRAULIC KIT COMPONENTS
- 50 OPERATING LOGICS
- 52 SELF-CALIBRATIONS
- 60 KISS POINT LEARNING AND CLUTCH GEARBOX CURVE FINE-TUNING PROCEDURE
- 66 PROCEDURE SUMMARY
- 67 FUNCTIONAL INTERACTION WITH OTHER SYSTEMS
- 67 SAFETY AND FUNCTIONS IN CASE OF FAILURE
- 68 P-R-N-D LEVER OPERATION
- 69 (+15)
- 70 (+50)
- 73 MANAGEMENT
- 74 LEVER FAILURE
- 74 STEERING WHEEL PADDLE MANAGEMENT
- 75 GEARSHIFTING WITH THE VEHICLE MOVING
- 76 DYNAMIC/NORMAL/ALL WEATHER LOGIC
- 77 SYSTEM SAFETY FUNCTIONS
- 81 SPECIFICATIONS
- 81 CLUTCHES
- 81 FLUIDS AND LUBRICANTS
- 82 GEARBOX CONTROL UNIT
- 86 WIRING DIAGRAM
- 90 SPECIAL TOOLS
- 91 LIST OF ACRONYMS
- 94 APPENDIX
- 94 DYNAMIC SUSPENSION (DS)
- 101 DIAGNOSTICS