360 Modena gear box manual - All Ferraris

speed depending on how the accelerator pedal is controlled: the car accelerates. As we can see,
the way in which we close the clutch is strictly linked to the engine rpm and to the command the
driver sends by means of the accelerator pedal.
The system is designed to modify pick-up conditions, taking into account the temperature of the
engine coolant: with very low temperatures, pick-up takes place with a faster engine rpm.
By attempting pick-up manoeuvres repeatedly or for too long (ex.: on an uphill road, the car at a
stand point, the accelerator pedal pressed), the clutch may overheat dangerously.
However, thanks to a mathematical model and without the use of sensors, the TCU can detect the
increase of temperature. Once reached the danger threshold, a buzzer is activated to warn the
driver that the clutch might be damaged.
The driver must then interrupt as soon as possible the pick-up manoeuvre, operating on the
accelerator. The buzzer will start sounding every time the pick-up us attempted until the clutch will
have reached normal working temperatures.
IMPORTANT
Reduce pick-up times whenever the buzzer starts: press harder on the accelerator pedal to prevent
clutch sliding.
To understand how the TCU controls gear shifting, consider the 3 subsequent operations carried
out by the driver (just as with traditional mechanical transmission):
• Torque reduction: at this stage, a synchronised control of engine torque reduction, clutch
opening and gear release takes place.
• No torque: the gear is by now completely released and the next gear is selected and engaged.
• Torque return: this is when the synchronised control of clutch closing and engine torque request
takes place.
The various clutch control strategies are peculiar to each step:
• during drive reduction, the clutch is opened according to the torque reduction controlled by the
engine;
• when there is no drive, the clutch is kept open;
• during torque return, the clutch closing depends on the engine shaft's and the primary gearbox
shaft speeds.
Clutch control during gear shifting takes into account the throttle angle (accelerator position) and the
engine revolution ratio: with the pedal pressed right down and high engine revolutions, the clutch
control will be set to sport mode.
Gearbox Control
The gearbox control is carried out by an engagement and selection actuator controlled by the TCU
through the respective solenoid valves: the pressure proportional valves control the engagement
actuator, whereas the proportional solenoid valves control the selection actuator.
The gear shifting actuator is controlled in accordance with the driver's requests, transmitted through