AUTOMOTIVE AIR CONDITIONING SYSTEM WITH AUTOMATIC CONTROL OF REFRIGERATION COMPRESSOR CAPACITY AND INLET AIR MIXING DOOR
An automotive air conditioning system is provided
comprising a duct for introducing a flow of air into a vehicle cabin, a
closed-loop refrigeration circuit including a compressor for circulating a
refrigerant through the circuit and an evaporator arranged in the duct to
contact the air flow such that an exchange of heat occurs between refrigerant
in the evaporator and air in the duct. The air conditioning system further
includes a temperature sensor arrange in the duct for measuring the temperature
of the evaporator, and a control unit for selectively commanding operation of
the system in accordance with the measured temperature of the evaporator. The
duct includes an outside air inlet and an inside air inlet separated by an air
mix door that regulates the amount of inside air introduced into the duct. In a
preferred embodiment, the temperature sensor comprises an infrared (IR)
temperature sensor that is remotely positioned downstream of the evaporator
such that the sensor can measure the temperature of a downstream surface of the
evaporator. The use of an infrared temperature sensor allows the temperature of
substantially the entire downstream surface of the evaporator to be measured
instead of a small finite area of the evaporator.
14 –
Blower;
16 – Evaporator;
18 –
Electrical control unit; 20 – Inside air
inlet;
22 –
Outside air inlet; 24 – Air
mix door;
28 –
Servomotor; 30
– compressor;
32 – Rotating shaft; 34 –
Pulley;
36 – Heater core; 38
–Air mix door;
40 – Inlet; 42 – Outlet;
46 – Servomotor;
50 – Central processing unit;
52 – Read
only memory; 54 – Random access memory;
62 – Blower drives circuit; 65 –
compressor control circuit;
68 – Infrared sensor; 70 –
Downstream surface of evaporator;
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