2428037 - E5010 STARTING AND RECHARING - Description (Smart gearbox)

Description

The ignition and recharging circuit comprises a battery, starter motor and alternator.The starter motor consists of a direct current motor supplied by the battery and an excitation solenoid. When the ignition key is turned to the extreme position (AVV), the starter motor windings are supplied, producing electro-magnetic forces which rotate the motor pinion. At the same time, the solenoid is energized and operates the mechanism for engaging the pinion in the flywheel ring gear, thus turning over the engine. In this version with robotized gearbox, the enablement for rotation of the starter motor is supplied by the robotized gearbox control unit  See E7051  ROBOTIZED GEARBOX . The alternator recharges the battery during normal engine rotation. The alterantor shaft (rotor) is turned by the crankshaft by means of a belt. When supplied with an excitation current, the rotor sets up a magnetic field that induces an alternating current in the fixed coil (stator). A diode rectifying bridge located on the back of the alterator transforms the alternating current into a direct current, which is sent to recharge the battery.A voltage regulator, also built into the alternator, maintains a constant voltage supply (about 14V) throughout the load and engine speed ranges.The efficiency of the recharging system is controlled by the Body Computer, which measures the D+ signal coming from the alternator with the engine running (rpm over 700).If a fault is detected, the relevant warning light on the instrument panel is switched on.The Body Computer also acquires the battery voltage value in the 6-18V field. The information is then supplied to the CAN network for the controls unit node on the door which excludes some services in the case of a voltage drop (for example  See E2510  COURTESY LIGHTS ).