Audi 80/Avant (B4)

Since 1991-1995 of release

Repair and car operation

Firm Bosch generator (the old version), the rear view

As Audi 80 cannot drag behind itself a lengthening cable electricity manufacture should occur directly in the car. This problem is carried out by the generator. And and not only for illumination as it was once, but also for all electric systems in Audi.

The three-phase generator of an alternating current

Capacity

Approximately till December, 1991 some versions Audi 80 have been equipped 65-ampernym by the generator, now are established only 90-ampernye generators. In special variants can stand and 110-ampernye or 120-ampernye generators. To calculate capacity of the generator, it is necessary to increase the specified maximum current strength by rated voltage in 14 V.Poluchaetsja, for example 90 And х 14 In = 1260 Vt. You have already noticed: the generator in 12-voltnoj actually gives to an onboard network 14 j to the storage battery the current for a charge only thanks to this small difference in pressure can arrive.

Transfer from a pulley of a cranked shaft to a generator pulley is chosen, by the way, so that already on single turns were made about 2/3 capacities of the generator.

Service of the generator and safety precautions

The three-phase generator of an alternating current differs enough high capacity and develops a current even on single turns of the engine. Its sliding graphite contacts (brushes) maintain more than 80 000 km. According to the name it makes an alternating current which in the car is not used as the accumulator can be charged only a direct current. Therefore the generator are built in выпрямительные the diodes transforming an alternating current in the pulsing direct current. As these diodes are sensitive to a high voltage, you should remember the following:

At the working generator it is impossible neither to weaken, nor to connect wires between the storage battery and the generator. Because of it there can be a pressure jump (pressure peaks) that will lead to diode damage. The three-phase generator of an alternating current should not work in the absence of correctly connected, serviceable storage battery because the accumulator serves some kind of the buffer from repressure. All cable connections between the three-phase generator of an alternating current, the storage battery and metal of a body or the power unit ("weight", the case) should sit strong. In dangerous peaks of pressure can result even leaky contact. At a fast charge of the accumulator (not to apply at gymnastics by means of devices to a charge with automatic switching-off) and at electric welded works on a body both wires that generator diodes have not been damaged should be disconnected from the accumulator.