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FIAT TIPO -51- REV 0.0
The control unit processes these values and calculates the following parameters expressing the
battery status:
SOC: (State Of Charge) percentage of the battery residual charge as compared to its rated capacity.
In other words it indicates the charge of the battery.
SOH: (State Of Health) "age" of the battery or, better, percentage of the battery real capacity as
compared to the rated capacity.
This condition has to be considered because the battery undergoes an irreversible ageing process
with time, reducing its ability to be fully recharged and therefore the possibility to supply all the
energy it could store when new.
SOF: (State Of Function) minimum voltage peak that can be reached during the start-up stage, in
volt.
These parameters identify the starting capacity of the battery.
In the case of insufficient SOC or SOH, the battery could not be able to restart the engine any more.
In the case of insufficient SOF, the battery voltage during starting may reach such low values that
the standard operating conditions of the various electronic units of the car are no longer guaranteed.
Calibration of the IBS
When the IBS is connected to the power supply for the first time or is reconnected after a service
operation, it enters the recalibration
During recalibration, the battery efficiency status (SOC,SOH and SOF) is calculated in a less
accurate way and with broader tolerances for a certain period of time during which the IBS must
recognise the type of battery it is connected to, its voltage and its efficiency status.
During this period, the S&S system may not stop/restart the engine to prevent the risk of an
insufficient energy level remaining in the battery.
Whenever the IBS is removed from/refitted to the power supply or the battery is replaced, when the
connections are restored a calibration processes is started to store the battery efficiency status
again.
The following table illustrates the calibration process logic.
First period of inactivity
> 4 hours and engine
start-up
5 time for 8 hours of
inactivity, followed by
car starting
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