Automobile Air Conditioning
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Transcript of Automobile Air Conditioning
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AN INTRODUCTION TO
AUTOMOBILE AIR-
CONDITIONING(PRINCIPLE OF OPERATION AND CONTROL SYSTEMS)
Team :Ride and handling
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MAJOR FUNCTION OF
AUTOMOBILE AIR CONDITIONER
Human comfort:
Temperature – 220C to 260CHumidity – 40 to 60 %
NOTTEMPERATURE
ALONE….
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HOW DOES HEAT GET INSIDE
VEHICLE ?
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REFRIGERATION SYSTEM
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REFRIGERANT R-134A
R134a - TetrafluroethaneR134a was selected as a replacement refrigerant for R12
(Dichlorodifluoromethane) because R12 containing chlorine
has a major effect to ozone layer depletion.
Before 1996:
R-12
CFC-12
After 1996:
R-134a
HFC-134a
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COMPRESSOR
Clutch assembly
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AC WIRING
Control Wiring Layout
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COMPRESSOR CYCLING CONTROL & PROTECTION
DEVICES
Pressure cycling switch - Electrical
Protection Devices
Clutch Diode
Refrigerant
Pressure Switches:• Low pressure• High pressure
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SENSORS
Sun load sensor
Ambient temperature sensor
The sunload sensor is a photochemical diode(PCD) located on top of the dashboard.
This sensor sends a signal to the electrical
climate control module (ECCM) indicating
the strength of the sunlight (sunload) which
influences the vehicle interior temperature.
High sunload High blower speed Maximum cooling
Low sunload Low blower speed Moderate cooling
The ambient temperature sensor is a
negative coefficient resistor (NTC) with low
voltage input. The sensor alters resistance depending on
the ambient air temperature surrounding it. The sensor is located in the ambient air
stream normally behind the bumper bar or
front grille area. This sensor is used to monitor the outside
temperature and is interconnected to a
visual display in the instrument panel.
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OTHER COMPONENTS
Flow Control valve Condenser
Fan
Evaporator
Hose
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COMPRESSOR CYCLING CONTROL &
PROTECTION DEVICES
Engine Control Module ECM!
Bod" Control Module BCM!
#o$er Tr%in Module #CM!
These modules are used to engage and disengage the
compressor !eacti"ate the #$C compressor at high$low system
pressures%
!eacti"ate the #$C compressor at &ic&down% #cti"e and deacti"ate the condenser 'an%(ncrease engine idle speed when #$C system is acti"ated%!eacti"ate the #$C compressor at high engine RP)%!elay #$C compressor engagement at engine cran&ing%#cti"ate electrical engine 'an at predetermined coolant
temperature%!eacti"ate the #$C compressor when coolant temperature
e*cessi"e%!eacti"ate the #$C compressor at wide open throttle
+,T.
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HVAC
H/#C is pro"ided to heat or cool the en"ironment in the "ehicle and to ensure
a good through-'low o' 'resh0 clean air 'or passenger com'ort and dri"er
alertness
#ir heating process #ir cooling process
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SENSOR LOCATIONS
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SYSTEM OVER VIEW OF ELECTRONICALLY
CONTROLLED AIR CONDITIONER
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SYSTEM OPERATING PRINCIPLE
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LEAK DETECTION
Method of leak detection
1.Visual leak detection
2.Soap solution
3.Electronic leak detector
4.Ultraviolet fluorescent system
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THANK YOU