Tatuus T318, Technical Manual

Page: 187 / 191

Release 3.00 (22/06/2020)
Page 186
15 S
HIFT SYSTEM
15.1 S
YSTEM
O
VERVIEW
The T318 is equipped with a semi-automatic shift system, here below a quick overview:
•
GCU (Gear Control Unit): embedded in the ECU.
•
GCC (Gearshift Current Controller): Magneti Marelli SRG-140/GCC, this unit manage the actuator
(ESA) control
•
ESA (Electric Shift Actuator): Magneti Marelli ESA, this unit driven by the GCC (Magneti Marelli) per-
form the physical shift, ESA is a position-controlled unit, refer to the chapter 15.1.3 for its setting and
maintenance.
15.1.1 Gearshift control
The semi-automatic gearshift is controlled by several parameters of the vehicle, critical sensors are:
• Paddle sensors
• RPM
• Throttle position
• Barrel position
• Clutch pressure sensor
• REV button
Upshift
• 1st to 6th gear: right paddle
• N to 1st gear: Clutch pr right paddle
• R to N: Clutch pr right paddle
Downshift
• 6th to 1st gear: left paddle (if over-revs threshold is respected)
• 1st to N: simultaneous left + right paddle
• N to R: (car steady) Clutch pr REV button
The downshift is allowed only if the lower gear (to be engaged) will not results in an overrevs, if an overrev
is expected the shift will be skipped and driver has to repeat the request.