opis klimatyzacji i elementów AR166 .pdf

eLearn - Contents

Strona 1 z 9

166 Introduction - AIR CONDITIONING CASING AND COMPONENTS

CLIMATE CONTROL WITH AUTOMATIC TEMPERATURE CONTROL

Presentation

The climate control system is the following type:

automatic temperature - ventilation - distribution control

with recirculation

with direction of the flows.

The user can select the desired air flow and temperature.

A special control unit manages the operation of the system.

The control unit implements the thermaladjustment according to the signals received from the:

outside air temperature sensor

inside air temperature sensor

vent outlet treated air temperature sensors

solar radiation sensor

According to the signals received, operates the following are operated to reach and maintain a comfortable temperature inside the

passenger compartment:

mixture actuator

recirculation actuator

distribution actuator

electric fan

compressor.

In addition, the control unit operates the heated rear windscreen via the integrated services control unit.

The climate control system basically consists of:

air intake unit

air filter unit

electric fan

air conditioning unit

mixture unit

heater unit

distribution unit.

1, Air conditioning compressor

2, Air conditioning condenser

3, Drier filter

4, Expansion valve

file://F:\alfa\eLearn\Web\tempcontent2.html

2010/10/14

eLearn - Contents

Strona 2 z 9

5, Evaporator unit

6, 4 stage pressure switch

7, Outside air temperature sensor

8, Solar radiation sensor

Air intake unit

The air intake unit makes it possible to:

let outside air enter the passenger compartment

circulate the air inside the passenger compartment.

An actuator, controlled by the control unit, moves the air intake flap into the two different positions.

Air filter unit

This consists of a filter which makes it possible to reduce pollution, pollen and some unpleasant odours.

Ventilation unit

This consists of a brushles motor which, depending on the voltage applied to the inlet circuit, regulates the speed of the fan and

consequently the air flow rate.

Air conditioning unit

It consists of:

a compressor

an expansion valve

an evaporator

a condenser

a drier filter

pipes

a 4 stage pressure switch

It makes it possible to cool and/or dehumidify the air introduced into the passenger compartment.

Mixture unit

It consists of special flaps and ducts which allow the temperature of the air introduced into the passenger compartment to be controlled.

Heater unit

It consists of a radiator supplied by the engine coolant which allows the air introduced into the passenger compartment to be heated.

Distribution unit

It consists of a series of flaps and ducts with special vents.

It allows the air to be distributed to the various parts of the passenger compartment.

Climate control controls

The user interface, integrated in the ICS system, for the climate control system consists of:

controls

a monitor with a colour display.

The climate control system controls appear on a single page by pressing the "CLIMA" button.

The following are displayed:

internal temperature set (in C or in F)

fan setting symbol

air distribution symbol (windscreen, centre of vehicle, floor)

defrost symbol (defrost ventilation activated/deactivated)

recirculation symbol (recirculaion activated/deactivated)

"MANUAL" or "AUTO" or "FULL AUTO" warning for modification of manual setting or automatic operation.

Operating logics

Starting transition

This logic is designed so as not to create problems for the user (cold air jets and/or demisting of the front window) in certain temperature

conditions during starting.

file://F:\alfa\eLearn\Web\tempcontent2.html

2010/10/14

eLearn - Contents

Strona 3 z 9

During the starting transition with "FULL AUTO" operation, the following functions are implemented:

initial air distribution to "FLOOR" and then "DEF"

air mixture flap completely open (maximum heat)

recirculation air flap in "dynamic air" position

compressor enabled

increasing variation in the air flow rate until a level calculated by the control unit is reached.

This logic is interrupted by possible requests for:

maximum cold (LO)

maximum heat (HI)

defrost (FRONT).

Maximum heat request (hi)

This is activated by setting a temperature value above 28 C corresponding to "HI".

To satisfy this requirement the system exits from the automatic control of the thermal adjustment ((FULL AIUTO) and modifies the

system functions as described below:

air mixture flap completely open (maximum heat).

automatic air distribution: distribution flaps in "FLOOR" position

manual air distribution: position of distribution flaps dependent on the preselected setting.

automatic ventilation: maximum permissible flow rate

manual ventilation: with flow rate corresponding to that preselected.

The interruption of the ventilation function takes place when the key is turned to the OFF position, or when the "OFF" button is operated

or when the "defrost" button is operated.

Maximum cold request (lo)

This is activated by setting a temperature value below 16 C corresponding to "LO".

To satisfy this requirement the system exits the automatic thermal adjustment control (FULL AUTO) and modifies the system functions as

follows:

air mixture flap completely closed (maximum cold)

automatic air distribution: distribution flaps in "VENT" position

manual air distribution: distribution flaps position dependent on the preselected setting.

automatic ventilation: maximum permissible flow rate

manual ventilation: flow rate corresponding to that preselected.

recirculation: air intake flap forced into recirculation position.

The interruption of the recirculation function occurs if the ignition is turned to the OFF position or if the "OFF" button is operated or if the

"defrost" button is operated.

Defrost request

It is activted using the "FRONT" button and manages the air flow rate depending on the temperature of the treated air coming out of the

vents designed to demist the windows inside the passenger compartment.

The management of the defrost involves the system functions as described below:

compressor enabled.

air distribution initially to "FLOOR" and then "DEF".

air mixture flap completely open (maximum heat)

Ventilation: the management of the automatic air flow rate depends on the temperature of the treated air.

recirculation: the air intake flap is forced into the dynamic position.

heated rear windscreen management: the heated rear windscreen is activated by the integrated services electronic control unit, in

accordance with an operating logic (see DESCRIPTIONS AND OPERATION: Integrated multiservices control unit - 5505).

This function is interrupted by operating the "OFF" button.

The defrost function has priority over the following request:

- maximum cold (LO)

- maximum heat (HI).

"full-auto" operation request

The completely automatic thermal adjustment control is implemented by pressing the AUTO button with the temperature setting between

16 C and 28 C.

"auto" operation request

The partial thermo-dynamically controlled thermal adjustment is implemented by:

file://F:\alfa\eLearn\Web\tempcontent2.html

2010/10/14

eLearn - Contents

Strona 4 z 9

pressing the AUTO button with the temperature setting between 16 C and 28 C and

modifying one of the following parameters: air flow rate, air distribution and recirculation.

This function is interrupted by operating:

the "OFF" button

by the maximum heat request (HI)

by the maximum cold request (LO)

Compressor engagement

The compressor is enabled with the:

evaporator temperature close to 5 C

defrost function selected

recirculation function switched off and outside temperature above 5 C.

The compressor is disabled with the:

recirculation function engaged and the outside temperature below - 5 C

recirculation function switched off and the outside temperature 3 C.

The compressor can also be switched off by operating the multi-stage pressure switch controlling the circuit or by the injection/ignition

control unit (see DESCRIPTIONS AND OPERATION: Injection/ignition system - 1056).

System components

Duct/distributor unit

This consists of three modules which inside contain:

the electric fan

the evaporator

the heater radiator

Upper mixed air temperature sensor

Lower mixed air temperature sensor

All the flaps are operated by special actuators controlled by the control unit.

1, Electric fan

2, Evaporator

3, Heater radiator

4, Upper mixed air temperature sensor

5, Lower mixed air temperature sensor

6, Outside/recirculation air flap actuator

7, Air distribution flaps actuator

8, Mixed air flaps actuator

9, Combined filter element

Air distribution

file://F:\alfa\eLearn\Web\tempcontent2.html

2010/10/14

eLearn - Contents

Strona 5 z 9

1, Intake/recirculation air flap

2, Electric fan

3, Evaporator

4, Heater radiator

5, Mixed air flap

6, Air distribution flap

A, Recirculation air flow

B, Outside air flow

C, Windscreen/side windows air flow

D, Centre and side vents air flow

E, Lower and rear vents air flow

Electric fan

The ventilation unit is made up of a brushless type direct current motor which, by means of the voltage applied to the intake circuit,

makes it possible to control the fan speed and consequently the air flow rate using a PWM signal.

The lack of brushes and commutator allows:

a reduction in inertia and wear

the lack of electrical and mechanical leaks

improved reliability, power and acceleration for the same torque.

The absence of the commutator eliminates problems of discharges between the terminals; the function of the commutator is carried out

by an external electronic switching circuit which produces the current in the induction winding.

There are less vibrations with this type of motor and lower consumption than compared with traditional linear control motors.

1, Electronic components inserted in an impermeable system

2, Card for electronics and connections

3, Support for motor and semiconductor heat dissipator

4, Centrifugal fan with high output and low noise

5, Motor cooling fan

6, Rotors with ferrite magnets

7, Laminated stator and winding

Combined filter element

The air introduced into the passenger compartment from the outside passes through a combined filter, i.e. consisting of two layers:

the first "particle" layer has the task of trapping the small particles of fine dust and pollen

file://F:\alfa\eLearn\Web\tempcontent2.html

2010/10/14

Plik z chomika:

Inne pliki z tego folderu:

Inne foldery tego chomika: