Generator and Regulator 44L: Description and Operation
so there will be significant periods of operation when battery charging is compromised. With this system, the EMS can set
the voltage by inferring the battery temperature from information received from it's various sensors, hence voltage will
follow the battery's needs a lot more accurately.
The regulator has transistors, which rapidly switch on and off to regulate the voltage output according to the voltage
sensed internally. The regulator also provides a PWM signal output to the ECM, which uses the signal to adjust the idle
speed under varying electrical loads.
Initially, the ignition switch supply provides an excitation current to the rotor at low generator speeds via brushes, which
contact slip rings at the end of the rotor shaft. As the generator speed increases the generator becomes self-exciting.
The charge warning lamp function is transmitted to the EMS and then on to the Controller Area Network (CAN) bus to the
instrument pack.
LOAD MANAGEMENT SYSTEM
The load management system comprises software resident in the Automatic Temperature Control Module (ATCM). For
additional information, refer to
Control Components
(412-04 Control Components)
Its purpose is to protect battery state-of-charge during abnormal usage of the vehicle. The system will request the Media
Orientated System Transport (MOST) ring and the air suspension to go into 'power save' mode, and will modulate
features such as seat heating and screen heating to prevent the battery being dragged down to a point where the car
becomes unoperational. A 'WARNING - LOW BATTERY' message will be displayed in the message centre.
