939011734 - E5010 STARTING 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.

This vehicle is equipped with a starting system known as Smart-Key, whereby the traditional ignition key has been replaced with an electronic key "T.E.G.", (Transmitter for Entry and Go), combined with an electronic key reader and TEG-Reader radio frequency receiver.The vehicle is not started by inserting the key and turning it in the ignition switch (which is not present), but by inserting the TEG in the TEG Reader and operating the START/STOP button.    See descriptions 5520 ENGINE STARTING

Pressing the START button supplies the motor windings producing electromagnetic forces that rotate the actual motor pinion. This simultaneously activates the electromagnet that operates the mechanism that causes the pinion to mesh with the flywheel ring gear and thus turn the crankshaft.The alternator recharges the battery during normal engine rotation. The alternator shaft (rotor) is turned by the crankshaft via a belt. When supplied by an excitation current, the rotor generates a magnetic field that sets up an alternating current in the fixed winding (stator). A diode rectifier bridge at the back of the alternator allows the alternating current to be transformed into a direct current that is sent to recharge the battery.A voltage governor, also built into the alternator, maintains the power supply at a constant voltage (14 V) throughout all load variation 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 moving (revs above 700 rpm).If the voltage measured is insufficient, the warning light in the instrument panel is switched on as well as the display of a message.The fuse box on the battery includes an automatic battery disconnection device that, in emergencies, cuts off the supply to the engine starting/recharging lead.This interruption is controlled by the inertia switch in the same way as for the fuel pump.    See descriptions 5505 INSTRUMENT/GAUGE ELECTRICAL CIRCUITS