AIR
CONDITIONING
392
Management of the air conditioning compressor
CHECKING THE EFFICIENCY OF THE AIR CONDITIONING SYSTEM
Air conditioning compressor safety.
The management of the aircon compressor clutch is identical whether
with basic air conditioning (RF) or with fully automatic air conditioning
(RFTA).
Air conditioning evaporator icing safety.
The BSI1 prohibits the triggering of the aircon compressor in certain
temperature conditions, to avoid the aircon evaporator icing up.
The BSI1 manages the evaporator icing safety in the following way:
- The aircon compressor is cut if the temperature of the aircon evaporator
sensor is lower than 1°C for 1 minute.
- The aircon compressor is triggered, after the cut-off timing of one minute,
when the temperature of the aircon evaporator sensor returns above 2°C.
Cutting of the aircon compressor caused by the speed of the com-
pressor.
The aircon compressor is cut in the following cases:
- If the aircon compressor speed reaches 8100 rpm ;
- If the aircon compressor speed exceeds 7500 rpm for more
than 10 seconds.
Air conditioning fluid pressure safety.
The status of the aircon high and low pressure safety is transmitted by a
linear pressure sensor via the BSI1.
The linear pressure sensor measures the pressure of the aircon fluid.
The engine ECU acquires the information on the aircon fluid pressure by
wire link.
The aircon compressor is cut if the aircon fluid pressure is lower
than 2.8 bars.
The aircon compressor is triggered when the aircon fluid pressure returns
above 3.3 bars.
The aircon compressor is cut if the aircon fluid pressure is higher
than 27 bars.
The aircon compressor is triggered when the aircon fluid pressure returns
below 20 bars.
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