199002815 - E5010 IGNITION AND RECHARGING - DESCRIPTION

DESCRIPTION

The ignition and recharging circuit comprises the battery, starter motor and alternator.The starter motor consists of a d.c. motor supplied by the battery and an excitation electromagnet.With the alternator still with the ignition key in the ON position, the warning light in the instrument panel comes on and sends a power supply to the voltage regulator built into the alternator via terminal D+.In these conditions the energizing circuit (rotor) is enabled to earth by the regulator electronics.With the alternator rotating through the effect of the variation of the rpm and the magnetic field, a three-phase alternating voltage is produced in the electrical circuit (stator) which rectified by the diode bridge can exit terminal B+.When the upper fixed calibration level (13.7 - 14.2 V) is reached it charges the battery and supplies the system.The engine control unit and Body Computer monitor the efficiency of the recharging system:- the engine control unit sends signal D+ to the Body Computer that monitors the efficiency of the alternator recharging system by recording two parameters: the voltage signal from alternator terminal D+ and the engine rpm signal that also receives signals from the engine control unit via the CAN.- at key-on while the voltage is less than approx 5.5V, the Body Computer indicates that recharging is insufficient; when the voltage exceeds 5.5V, the warning light goes off. If - with the engine running (rpm higher than 700) - the voltage drops below a threshold of 4.5 V, the warning light comes on in fixed manner, accompanied by a message on the display.