System Operation - Smart Regenerative
Charging (SRC) Except Camper
The largest element of the SRC strategy is stored
in the Body Control Module (BCM). It receives all
of the important information relating to the battery
condition sent by the Battery Monitoring Sensor
(BMS) via the Local Interconnect Network (LIN)
data bus.
Using the information received, the BCM then
sends the set value needed for the alternator
charging voltage via the HS CAN (Controller Area
Network) data bus to the PCM/ECM. This then
adjusts the value received if necessary and passes
it on the alternator via the LIN. The charging
voltage is adjusted depending on various
parameters, such as the current level of engine
efficiency. The smallest possible set value for the
alternator voltage (V) is 12.2V, while the maximum
charging voltage may be anywhere between 14.5V
and 14.9V. However, when the battery is in a
refresh phase, the voltage could occasionally reach
up to 15.2V. These refresh phases are required as
the battery charge status is 80% over long periods
of time.
Refer to: 4.4 Battery and Cables (page 80).
Comparison of SRC and Conventional
Charging
The following figure E140419 demonstrates the
difference between SRC and conventional battery
charging. Conventional charging aims to charge
the battery to the highest possible levels. During
this process the battery temperature is monitored
(inferred temperature) and the battery must not
be overcharged. By comparison SRC uses the
information from the battery monitoring sensor
(voltage, current and direct temperature) to
maintain, more accurately, the battery at a
calibrated state of charge. This means that the
battery has a certain amount of extra charging
capacity at all times. If the BCM detects that the
charge status is above the calibrated value the
alternator charging voltage is reduced, in order to
discharge the battery. If the opposite occurs and
too low a value is detected, the charging value is
increased in order to return the battery to the
calibrated value.
FORD
TRANSIT CUSTOM
2012.75
Date of Publication: 04/2012
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