Fig. 19.1. Schematic diagram of the 4G9 engine charging system
Fig. 19.2. Schematic diagram of the 4G1 engine charging system
The charging system uses the generator's energy to maintain the battery in a charged state regardless of changes in the electrical load.
When the ignition key is turned to the ON position, current passes through the rotor winding and the initial magnetization of the winding occurs (excitation of the generator).
When, after starting the engine, voltage is generated on the stator winding, the excitation winding (rotor) is powered by the output current of the stator winding, rectified by diodes.
When the excitation current increases, the generator output voltage increases, and when the excitation current decreases, it decreases.
(The material was created based on the website: MITSUBISHIMAN)
When the battery voltage reaches a preset value of 14.4 V, the excitation current is turned off.
When the battery voltage drops below a specified value, the voltage regulator, by controlling the excitation winding current, maintains the generator output voltage at a constant level.
In addition, when the excitation current value is constant, the generator output voltage increases with increasing engine crankshaft speed.