GF83.10-P-2000GI Ventilation, Function
GF83.10-P-2000GI Ventilation, Function
- with CODE (580a) Automatic air conditioning
Air distribution duct
The air distribution duct and the existing air outlets for ventilating the vehicle interior are shown by the arrows.
Temperature-controlled air flows out of all the air outlets (red/blue arrows).
Function
The ventilation system ensures:
- that the windshield and windows are kept demisted.
- that there is a supply of fresh air to the vehicle occupants.
- that constant and pleasant temperatures are quickly achieved in the vehicle interior.
Ventilation is achieved with the assistance of the blower motor during normal operation, when vehicle is stationary or to increase the air quantity.
Fresh air is drawn into the evaporator housing via the air inlet. Depending on the automatic air conditioning pushbutton control module setting, the air is directed through the air ducts to the air vents in the interior.
The air flows out of the vehicle again through the rear vent via ventilation slots to the left and right in the area below the rear side windows.
In recirculation mode, air is drawn out from the vehicle interior via the fresh air/recirculation flap (recirculation setting) by the blower motor and passed to the evaporator housing.
The ventilation is essentially divided into heating operation and cooling operation.
Heating operation
Two main objectives are pursued in heating operation:
- rapid heating and even control of in-car temperature
- good visibility through windshield and front side windows
In the starting phase the headroom temperature is deliberately increased, in order to meet the passengers' initial increased heat requirements. The temperature and the duration depend on the outside temperature and the in-car temperature.
As far as good visibility is concerned, special control measures to accelerate defrosting of the windows are taken during the starting phase, depending on the ambient conditions.
In closed-loop operation the footwell vents are mainly used to control the in-car temperature. The center nozzle is fully closed. The defrosting control measures are reduced.
Cooling operation
During cooling operation the objective is to cool the interior rapidly and evenly control the temperature.
Window fogging is not usually a problem during maximum cooling operation and therefore does not require special measures.
In the starting phase the headroom temperature is deliberately reduced. The temperature and the duration depend on the outside temperature and the in-car temperature.
Furthermore, the cooling capacity can be reduced during subsequent operation since continuous partial recirculating air operation can be achieved.
In closed-loop operation the center nozzles are mainly used to control the in-car temperature.
Bi-level operation (2-level operation)
In bi-level operation the temperature of the interior is controlled by a combination of the footwell nozzles and the center nozzles.
The objective is to create stratification, which gives the passengers warm feet and a cooler head.
The air distribution shifts in the direction of heating or cooling operation depending on the controller status trend.
Rear compartment ventilation
The rear compartment nozzles are supplied with temperature controlled air by the front compartment automatic air conditioning. The rear compartment nozzle outlet temperature can therefore not be separately controlled.
The air quantity and the air distribution are available as adjustable parameters. The passengers in the rear can control the ventilation themselves using appropriate buttons.
In automatic mode the air quantity and the air distribution are controlled depending on the status of the automatic air conditioning.