Function

Function

General
Output voltage from the generator (GEN) is calculated from the battery temperature in order to charge the battery fully. To determine the temperature of the battery, a battery temperature gauge is connected to the central electronic module (CEM). See Design and Function, central electronic module (CEM).

Note! For vehicles manufactured from week 05 2006, the battery temperature sensor has been replaced by a new function in the central electronic module (CEM). The central electronic module (CEM) calculates battery temperature based on outside temperature, which is obtained from the outside temperature sensor.

Charging, 5 cylinder engines
When the ignition key is turned to position II (and III), information is transmitted from the central electronic module (CEM) to the charge regulator (alternator control module (ACM)) via the engine control module (ECM).
The regulator directs current to the excitation winding rotor and is then grounded via the regulator. When the current travels through the rotor a magnetic field is formed around the rotor. When the engine is started and the rotor begins to rotate, the magnetic field also rotates and then produces alternating current in the stator windings.
Alternating current is rectified when it passes the diodes and is then fed to the electrical system of the vehicle. The voltage obtained from the stator winding also passes to the regulator via the rectifier and affects the control functions.
The desired value for charge voltage is transmitted from the central electronic module (CEM) to the charge regulator via the engine control module (ECM). This value is based on factors such as the calculated battery temperature. The regulator then operates so that the desired voltage is maintained at the battery.
The charge indicator lamp in the combined instrument panel is controlled by the driver information module (DIM) via signals from the controller area network (CAN).

Charging, 4 cylinder engines
When the ignition key is turned to position II (and III), information is transmitted from the central electronic module (CEM) to the charge regulator via the engine control module (ECM).
The regulator directs current to the excitation winding rotor and is then grounded via the regulator. When the current travels through the rotor a magnetic field is formed around the rotor. When the engine is started and the rotor begins to rotate, the magnetic field also rotates and then produces alternating current in the stator windings.
Alternating current is rectified when it passes the diodes and is then fed to the electrical system of the vehicle. The voltage obtained from the stator winding also passes to the regulator via the rectifier and affects the control functions.
The desired charge voltage is transmitted from the central electronic module (CEM) to the charge regulator via the engine control module (ECM). The regulator then operates so that the desired voltage is maintained at the battery. A direct connection to the battery provides a reference so that the voltage of the battery can be determined. This is to measure the drop in voltage between the generator (GEN) and battery so that any such drop can be compensated for.
The charge indicator lamp in the combined instrument panel is controlled by the driver information module (DIM) via signals from the controller area network (CAN).

Current limiting
See Design and Function, Central electronic module (CEM).