3023546 - E6020 AIR CONDITIONING - Description
Description
The vehicle climate control system involves a duct/distributor
unit with a heater. The air conditioning system includes the heater
and has the function of producing cold, dehumidified air by switching
on the compressor and the cooling system.The climate control is operated by
acting on the three knobs in the dashboard:
- the left knob controls mixing of hot and cold air;
- the right knob, mechanically operated via a cable, controls
the opening of the flaps which regulate the distribution of air
flows;
- the centre knob electrically controls the ventilation
of the air at four different speeds;
The air recirculation button and the button
for switching on the air conditioning compressor are located in
the lower part of the control panel.A dedicated control unit manages
system operation by controlling:
- Air distribution to the vents.
- speed of the fan (varies continuously);
- activation of the compressor (air refrigeration circuit);
- activation of air recirculation;
- The MAX-DEF fast defrost function (i.e. a set of actions
which allow both the windscreen and the rearscreen to be demisted
quickly);
The control unit sets the above parameters
in order to adjust passenger compartment temperature to the required
level.According to the setting, the control unit
adjusts passenger compartment air intake speed by means of the fan
motor and air temperature by a mixer actuator. It also controls
flow distribution via another actuator and - lastly - the interior/exterior
air recirculation function via a final actuator.
When required, the ECU automatically activates
the cooling circuit and dehumidifies the air by operating the air
conditioner compressor
See E6021 COMPRESSOR ENGAGEMENT
.
For more details
Characteristic of working principle 5040 AIR CONDITIONING CASING
AND COMPONENTS
.
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Recirculation brings about closing
of windows
See E3050 ELECTRIC FRONT WINDOWS
and
sun roof
See E3060 SUN ROOF
. The air
conditioning control unit downloads a signal from the gas presence
sensor and activates the recirculation function to prevent polluted
air from being taken into the passenger compartment. When normal
conditions are restored, the climate control system ECU resets recirculation
to the position prior to function activation. Because recirculation
is activated under these conditions, a command is sent for automatic
closure of the windows
See E3050 ELECTRIC FRONT WINDOWS
and
sun roof
See E3060 SUN ROOF
.
|
The climate control system ECU receives
a signal from the body computer to indicate that the windscreen
washer is on and activates the recirculation function to prevent
the liquid detergent smell from entering the passenger compartment.The vehicle speed signal - received by the
CAN network - is used to filter outdoor temperature and adjust ventilation
and the dynamic air intake according to car speed.The body computer continually downloads
a battery voltage signal for comparison with its limit value. If
the recorded battery voltage is lower than the threshold, the computer cuts
in via the CAN network to send a signal to disable a series of appliances:
this includes the fan control.The climate control system ECU is supplied
by an ignition-operated line protected by a fuse in the underfacia
control unit; the fan is supplied by a line protected by a specific engine
bay control unit fuse.