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Fully automatic transmission
On cars Passat installed four- or five-fully automatic transmissions. The automatic transmission includes a torque converter, planetary gears, and the clutch and brakes with hydraulic and electric drive. The torque from the engine to the transmission is transmitted through the torque converter, which performs the function of coupling liquid and acts as an automatic clutch and transmits the torque during acceleration. Control automatic transmission electronic control unit is made. The electronic unit on the basis of more extensive data sets the optimum mode for the transmission of each operational mode. To control the transmission mode is switched absent mye hand, such as economical and sporty. The control unit on the basis of information about the vehicle speed, pedal position akseleratov RA, as well as the manner of movement selects the appropriate gear. Also, at the time of shift traffic conditions affect the availability of the trailer and the wind. If a defective sensor or solenoid valves, switches transmission control for emergency operation, and a fault is recorded in the memory unit. Towing the vehicle with an automatic transmission on wheels should be done at a distance of 50 km with a maximum speed of 50 km / h. All-wheel drive cars with automatic gearbox must not be towed, one lifting axle. The transmission represents very difficult unit and its repair must be carried out in a specialized workshop tion. Before repairing the gearbox is necessary to determine the nature of the fault, which can be an electrical, mechanical or hydraulic. Do not remove the gearbox from the car for repairs before will not be professionally detected a fault, since most tests require that the transmission is in the vehicle.
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