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Charging system designed to prevent discharging of the battery |
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It is necessary to increase charging capacity
for an “idling stop” vehicle compared to a
vehicle that with idling. This is necessary because the
battery is not charging when the vehicle is stopping for
a traffic signal etc.
An “idling stop” vehicle cannot restart if
the battery is discharged and the starter motor cannot
crank the engine. To cope with the aforementioned, the
charging output from the ACG starter in the “idling
stop” vehicle is designed to such a level that prevents
the battery from discharging even when operated on congested
roads using the “idling stop system”.
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Reduced friction from the power generation |
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When an “idling stop system”
is applied, due to lack of power generation during stopping,
the electrical loads, such as the headlamp, draw a considerable
amount of power from the battery when stopping. Power
consumed from the battery during stopping is quickly recovered
from the alternator when the engine revolutions increase
and the power generation starts. A considerable amount
of mechanical energy from the engine must be consumed
for the power generation by the alternator, resulting
in weak vehicle acceleration.
 Friction
from power generation |
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The charging voltage at the time of start is regulated. |
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To reduce friction from power generation,
and to ensure strong vehicle acceleration when equipped
with the “idling stop system”, the charging
voltage is lowered to 12 volts from the normally regulated
voltage of 14.5 volts for a prescribed period of time.
In doing so, the battery is not charged during vehicle
acceleration, and charged only during constant speed or
deceleration. Charging during deceleration is especially
effective because it means an efficient use of energy.
Charging voltage regulation |
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