General Information; General Information; Charging System - Mitsubishi Electric Lancer Evolution-VII Workshop Manual

16-2

CHARGING SYSTEM

GENERAL INFORMATION

The charging system uses the alternator output
to keep the battery charged at a constant level
under various electrical loads.
Voltage
Time
When the ignition switch is turned on, current flows
in the field coil and initial excitation of the field
coil occurs.
When the stator coil begins to generate power after
the engine is started, the field coil is excited by
the output current of the stator coil.
The alternator output voltage rises as the field
current increases and it falls as the field current
decreases. When the battery voltage (alternator
S terminal voltage) reaches a regulated voltage
SYSTEM DIAGRAM
Stator coil
ENGINE ELECTRICAL -
OPERATION
Rotation of the excited field coil generates AC voltage in
the stator.
This alternating current is rectified through diodes to DC
voltage having a waveform shown in the illustration at left.
Approximately
The average output voltage fluctuates slightly with the
14.4 V
alternator load condition.
Field coil
Voltage
regulator
Charging System
of approximately 14.4 V, the field current is cut
off. When the battery voltage drops below the
regulated voltage, the voltage regulator regulates
the output voltage to a constant level by controlling
the field current.
In addition, when the field current is constant, the
alternator output voltage rises as the engine speed
increases.
B
Engine-ECU
G
S
L
FR
Charging
warning lamp
Ignition
Battery
switch