194001590 - E5010 STARTING AND RECHARGING - DESCRIPTION (AUTOMATIC TRANSMISSION)

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.The starting system on this vehicle, unlike classical solutions adopted previously, is distinguished by the use of an ignition device (TEG Reader) combined with the steering lock control unit (NBS).Depending on the position of the key (TEG) inside the starting device, the steering lock control unit determines:f the enablement request for the +15 supply to the Body Computer (ON position), the +50 starting for vehicle (START position) and, if the result is positive, the power distribution to the vehicle and to the various load (INT, INT/A,15/54).The starting system involves that together with the rotation of the key to the START position the clutch pedal (or in recovery conditions, the brake pedal) for versions with a manual gearbox or the brake pedal for versions with automatic transmission, is pressed.On versions with automatic transmission the additional condition of the gear lever in P (PARK) must be observed.Therefore when the steering lock control unit is in the condition to provide the +50 power supply for the starter mtor, the motor windings are suplied, producing the electromagnetic forces that rotate the 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 allows the alternating current to be transferred 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 (about 14 V) throughout the load variation and engine speed ranges.For further details,    See descriptions 5520 ENGINE STARTINGThe efficiency of the recharging system is controlled by the Body Computer which measures the D+ signal coming from the alternator with the engine moving (engine revs above 700 rpm).If a fault is detected, the warning light in the instrument panel is lit up.The Body Computer also acquires the battery voltage value in the range 6 - 18 V depending on a control logic known as SBMT.The information, transmitted on the CAN to the door nodes, involves the exclusion of certain services after a timed delay of 15 minutes. For example,    See E2520 GLOVE COMPARTMENT LIGHT - LUGGAGE COMPARTMENT LIGHT - SUN VISOR LIGHT