METHOD AND DEVICE FOR MOTOR VEHICLE HEATING AND AIR CONDITIONING MONITORING WINDSCREEN MISTING

摘要

The invention concerns a refrigerating fluid circuit capable of operating in three fluid circulation modes, namely an air conditioning mode whereby the fluid circulates successively in the evaporator (5) where it is evaporated by receiving the heat of the air flow to be treated (F1), in the compressor (4), in the condenser (6) where it is condensed by yielding the heat to another medium (F3) and in a pressure reducing valve (10); a supplementary heating mode whereby the fluid circulates in gaseous state between the evaporator where it yields heat to the air flow (F1) and the compressor, without passing through the condenser, and an inoperative mode whereby the fluid does not circulate in the evaporator. The invention is characterised in that the circulation mode is determined taking into account not only the user's choice but also the possible presence of mist on the windscreen (21), detected by a sensor (23), so as to promote demisting while optimising comfort and energy conservation.