START/STOP OPERATION - version with manual gearbox
The system operates every time the car is started.
Engine stopping mode.
With the vehicle almost at a standstill (speed lower than 3 km/h for more than 0.5 seconds and accelerator pedal released), the engine stops if the following manoeuvres are carried out:
- gearbox in neutral
- clutch pedal released.
The engine stopping is signalled by the dedicated warning light on the instrument panel.
The engine can only be stopped automatically after a speed of about 10 km/h is reached, to prevent the engine from being repeatedly stopped when driving at walking pace.
For comfort, emission control and safety reasons, under certain circumstances the system "locks" the normal operation of the device.
Engine stopping failure conditions.
When the device is active the engine does not stop if:
- engine still cold (signal from the engine temperature sensor lower than about 40°C);
- battery not sufficiently charged (state of charge lower than 75%) or battery charge sensor malfunction detected;
- reduced braking system vacuum, detected by the dedicated sensor, e.g. if the brake pedal is pressed repeatedly;
- particulate filter regeneration in progress (diesel engines with DPF only);
- voltage stabilizer malfunction
- heated rear window activated (assuming that the driver wishes to demist the windows, it is appropriate for the engine to remain running to have hot air and/or air conditioning available)
- windscreen wiper operating at maximum speed for more than 4 seconds (in this condition it is assumed that the weather conditions are adverse and so it is preferable to have maximum driving comfort);
- driver's door not shut;
- driver's seat belt not fastened;
- reverse gear engaged (in this way the driveability during parking manoeuvres is not compromised);
- with automatic climate control system, if an adequate level of thermal comfort has not been reached (difference between the climate control temperature set by the customer and the temperature inside the passenger compartment greater than 4°C) or MAX-DEF activation;
- malfunction of some sensors or systems
- during the first period of use, to initialise the system.
- particularly cold external temperatures, if the corresponding indication is provided.
In the above cases there is an information message in the display and, where provided, the warning light will flash on the instrument panel.
Safety functions
In engine cut-out conditions through the Start&Stop system, if the driver unfastens his/her seat belt and opens the driver's door or the passenger door, the engine can be restarted only by using the key.
The driver is notified of this condition both by a buzzer and through an information message in the display and by the warning light on the instrument panel flashing.
Other conditions "blocking" the device are:
- many unsuccessful automatic start-up attempts, if the maximum number (5) of failed engine automatic start-up attempts is exceeded; this threshold is set to avoid damage to the starter;
- malfunction of some sensors or systems;
- the driver has been prompted to perform an action but did not perform it in time (175 second timeout from the engine stopping); for example if an automatic engine restart attempt is unsuccessful as a result of a failure to press the clutch or because the gearbox is not in neutral and the driver is then requested to allow automatic restart by pressing the clutch or engaging neutral, the engine can only be restarted using the key after 175 seconds have elapsed from the engine stopping;
- engine bonnet open (only where provided).
From Elearn.
