Audi A4

Since 1994 of release

Repair and car operation

Audi А4
+ Running gear
+ Regular servicing
+ Engines
+ Turbo-supercharging
+ Exhaust system
+ Cooling system
+ Fuel tank and the fuel pump
+ The air filter and channels всасывания
+ Injection system
+ Coupling
+ Transmission and the main transfer
+ Suspension bracket of wheels and steering
+ Brakes
+ Wheels and tyres
- The electrotechnical equipment
   The minus is connected to weight
   The help for orientation in the electrotechnical equipment of the car
   Connections of wires
   The central switching knot
   Support of additional relays
   Box for electronics
   The relay and management blocks
   The switching relay
   H-contact of the relay of unloading
   The table of the relay and management blocks
   Safety locks
   The table of safety locks
   + Electric schemes
   + The accumulator
   - The generator
      The alternating current generator
      Control bulb of gymnastics
      Pressure regulator
      The self-help in work with the generator and a pressure regulator
      Movement with the defective generator
      Клиновой and поликлиновой a belt
      Condition check клинового and поликлинового a belt
      Replacement клинового and поликлинового a belt
      Torn клиновой a belt
      The review: клиновой and поликлиновой a belt
      The help at malfunctions
   + Starter
+ Ignition system
+ Illumination
+ The alarm equipment
+ Tools and devices
+ Heating and ventilation
+ Body details
+ Salon
Search of malfunctions
Technical characteristics

Ремонт квартиры под ключ, ремонт под ключ цена ростов на дону

The alternating current generator


Depending on the engine and a complete set we see in Audi A4 generators capacity 70, 90 and 120 And. 70-ampernyj the generator is serially put on cars with four-cylinder engines, 90-ampernyj the generator enters into a serial complete set of cars with six-cylinder engines and 120-ampernyj the generator enters in спецкомплектацию.

To define capacity of the generator, it is necessary to multiply the specified maximum current by rated voltage in 14 V.Naprimer, 90А Х 14 In = 1260 Vt.

You have already noticed: the generator really delivers 14 In at 12 In in an onboard network. Т е. Only at such small distinction in pressure the current can flow to the accumulator that it to charge.

Transfer from a belt pulley коленвала to a belt pulley of the generator so is chosen that on single turns can already be made about 2/3 capacities of the generator.

The reference with the generator and safety measures

The alternating current generator along with the enough high capacity possesses decided advantage: it submits a current already on single turns of the engine. Besides, its graphite brushes maintain the run considerably exceeding 80 000 km. As it is clear under the name, it makes an alternating current which we cannot use in the car as the accumulator can keep, of course, only a direct current. Therefore in the generator three are built in диодных the rectifier which will transform an alternating current to a pulsing direct current. These diodes are sensitive to high pressure and consequently you should consider following moments:


  1. At the working engine it is impossible neither to remove, nor to connect any wire between the accumulator and the generator. At the expense of it pressure (pressure peaks) can sharply increase and to "overheat" the diode.
  2. The alternating current generator should not work without correctly connected and serviceable accumulator. The accumulator serves for the generator somewhat as the buffer at pressure peaks.
  3. All connections of wires between the alternating current generator, the accumulator and metal of a body or the block of the engine (weight) should be strong. Even shaking contact can lead to pressure jumps.
  4. At the accelerated gymnastics of the accumulator (it is impossible to use for gymnastics in house conditions) and at welding works on a body both wires not to damage generator diodes should be disconnected from the accumulator.

In models with four-cylinder engines the generator (2) settles down at the left ahead near to the engine and is accessible from above. By figure "1" the top fixing bolt is shown.

Kind of the six-cylinder engine from below. The generator (2) takes places on the right below about the engine. For generator cooling the air channel (1) (here it is dismantled for the sake of presentation of the image) is connected.