Convertible Mode Control
The aim of Convertible mode is to create an automatic program
that renders manual intervention by the driver or passenger unnec-
essary.
When driving with the top down, the occupants consciously
expose themselves to the solar radiation and outside temperature
at changing driving speeds. These parameters have a decisive
influence on the climate in the vehicle interior and must therefore
be taken into consideration in the control concept.
The spatial separation of the interior is cancelled when the hardtop
is opened thus drastically reducing the influence of the interior
temperature sensor. The temperature control for the vent outlet
temperature is strongly orientated on the outside temperature.
The sun's intensity has a great influence on the climate in the
vehicle interior when driving with the top down. Therefore, changes
in conditions such as cloudless, cloudy or daytime/night-time are
included via the solar sensor to a greater extent in the temperature
control than when the hardtop is up.
Unlike when the vehicle is closed, the ventilation outlets become
the dominant air distribution level when the hardtop is down and
are therefore always fully opened while, to achieve a comfort
balance, the footwell outlets must always be restricted as soon as
the operating temperature of the engine necessary for heating is
reached.
Measures for keeping the windshield/windows clear are not neces-
sary when driving with the top down, therefore the defrost outlets
always remain closed.
The driver sets the required temperature at the temperature
control. Depending on the outside temperature, sun's intensity
and vehicle speed, the required interior climate is maintained by the
supply of correspondingly temperature-controlled air.
The most comfortable conditions are achieved with the side win-
dows closed and a wind deflector additionally installed.
The ram pressure compensation that serves the purpose of keep-
ing the air throughput constant when the vehicle is closed is
cancelled in Convertible mode. The blower output is additionally
increased based on the vehicle speed in order to maintain a
constant air flow about the occupants.
The increasing air volume essentially shields the occupants from
increasing turbulence at higher vehicle speeds. The occupants
subjectively notice no difference in temperature conditions.
The AUC function is also active in Convertible mode up to a speed
of 45 mph (70 km/h). It is deactivated at higher speeds. This is
intended to ensure that no pollutants are blown into the interior of
the vehicle via the air conditioning outlets when driving at low
speeds, e.g. in urban or stop-and-go traffic. The best effect is
achieved with the side windows closed.
Note: If Convertible mode is not activated, the selected
automatic program (soft, medium, intensive) is
activated when the hardtop is opened. All other
program settings are deactivated (grey) if the
Convertible mode is activated with the hardtop
lowered. The other program settings can be selected
if Convertible mode is not activated with the hardtop
lowered.
E93 Complete Vehicle Workbook
49
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