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S
&S
TART
TOP SYSTEM
The Start&Stop device makes it possible to automatically switch off the engine when traffic conditions
mean that the vehicle is stopped and to restart the power unit when the driver is about to set off.
The S&S system improves the efficiency of the vehicle by reducing consumption, the emission of
harmful gases and noise pollution. The operating logic is managed, in the main, by the Powertrain
Control Module and the Body Computer.
The device is essentially based on a starting system (battery and starter) capable of restarting the
engine quickly and quietly. The device can do this a far greater number of times than a normal
production system would need to.
The goals of the starting system in terms of driveability, starting responsiveness (when warm),
reliability, durability and safety involve the adoption of a more powerful and robust starting system: this
is guaranteed by the use of a larger battery and starter.
SYSTEM COMPONENTS
The system contains other components (mainly sensors and control strategies) that manage the
stopping and restarting operations without requiring the drivers to change their driving style, ensuring
the safety, driveability and energy balance aspects of the vehicle with a minimum impact on climate
comfort and the accessibility of the on board services.
IBS (Intelligent Battery Sensor)
The battery charge status sensor IBS, located on the negative battery pole, is connected directly to the
body power earth and allows the battery status to be always evaluated correctly, preventing any
undesired current consumption.
The actual negative pole (known as "dummy pole") is offset slightly and must be considered as the
real earth reference.
The IBS sensor detects the following battery values:
•
Battery voltage (V)
•
Battery current (A)
•
Battery temperature (°C)
Processing these parameters results in the following:
•
SOC: Battery state of charge
•
SOH: Battery ageing
•
SOF: Battery state of function
Determining the SOC, SOH and SOF is essential for correct operation of the system.
When the IBS receives power supply for the first time or after a break in supply, it enters a
recalibration stage in which the IBS must recognise the type of battery, its specifications and its status.
Heavy Duty Batteries
On this version the battery is the heavy duty type equipped for greater electrical stress.
Replacing a heavy duty battery with a regular type of battery may lead, in addition to a reduced
availability of the Start&Stop system, to the early wear and a much shorter life of the battery.
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