AIR CONDITIONING SYSTEM(for Manual Air Conditioning System) SYSTEM DESCRIPTION

  1. GENERAL

    1. The air conditioning system has the following controls.

      Control

      Outline

      Manual Control

      Damper positions and blower speed operate automatically according to the operation of switches such as the temperature control switch, blower switch, mode control switch and inlet control switch.

      Compressor Control

      Through the calculation of the target evaporator temperature based on various sensor signals, the air conditioning amplifier optimally controls discharge capacity by regulating the opening extent of the compressor solenoid valve.

      Diagnosis

      A Diagnostic Trouble Code (DTC) is stored in memory when the air conditioning amplifier assembly detects a problem with the air conditioning system.

  2. MODE POSITION AND DAMPER OPERATION

    1. Mode Position and Damper Operation.

      E249124C01

      *a

      Air also blows out of the side registers

      *b

      Air also blows out of the side registers and defrosters
      Table 1. Functions of Main Dampers

      Control Damper

      Operation Position

      Damper Position

      Operation

      Air Inlet Control Damper

      FRESH

      A

      Allows fresh air to enter.

      RECIRCULATION

      B

      Causes internal air to recirculate.

      Air Mix Control Damper

      MAX COLD to MAX HOT Temperature Setting

      C - D

      Varies the mixture ratio of warm air and cool air in order to regulate the temperature continuously between hot and cold.

      Air Outlet Control Damper

      DEF

      E264847

      E, I

      Air blows out of the center defroster, side defrosters and side registers.

      FOOT / DEF

      E264851

      E, H

      Air blows out of the front footwell register ducts, side registers and center defroster.

      FOOT

      E264850

      E, G

      Air blows out of the side registers, front footwell register ducts. In addition, air blows out slightly from the center defroster and side defrosters.

      BI-LEVEL

      E264849

      F, H

      Air blows out of the front footwell register ducts, front center registers and side registers.

      FACE

      E264852

      F, I

      Air blows out of the front center registers and side registers.

  3. AIR OUTLETS AND AIRFLOW VOLUME

    1. Air Outlets and Airflow Volume.

      E263080N02

      Indication

      Mode

      FACE

      FOOT

      DEF

      CTR

      SIDE

      C

      D

      A

      B
      E264852

      FACE

      		 E264853 E264853 E264858 E264858
      E264849

      B/L

      		 E264857 E264857 E264857 E264858
      E264850

      FOOT

      		 E264858 E264855 E264857 E264855
      E264851

      F/D

      		 E264858 E264855 E264857 E264855
      E264847

      DEF

      		 E264858 E264855 E264858 E264857

      The size of each circle ○ indicates the ratio of airflow volume.

  4. COMPRESSOR

    1. General

      1. The compressor assembly with pulley is a continuously variable capacity type with a capacity that varies in accordance with the cooling load of the air conditioning.

      2. The compressor assembly with pulley consists of the shaft, lug plate, piston, shoe, crank chamber, cylinder and solenoid control valve.

        E254487C04

        *a

        Example

        -

        -

        *1

        Shoe

        *2

        Crank Chamber

        *3

        Shaft

        *4

        Lug Plate

        *5

        Piston

        *6

        Cylinder

        *7

        Solenoid Control Valve

        -

        -

      3. A variable suction side throttle is used.

        • Refrigerant inlet pressure is applied to the top of the variable suction side throttle and crank chamber pressure is applied to the bottom of the variable suction side throttle.

        • The pressure difference moves the variable suction side throttle up and down, expanding and contracting the refrigerant inlet passage.

        • When the refrigerant flow is at a maximum, the refrigerant inlet pressure is greater than the crank chamber pressure. This causes the variable suction side throttle to move down, fully opening the refrigerant inlet passage and lowering the refrigerant inlet pressure.

        • When the amount of refrigerant flow is controlled, the crank chamber pressure is greater than the refrigerant inlet pressure, raising the variable inlet throttle to contract the flow passage.

        • These controls suppress noise by reducing pulsation from the refrigerant inlet.

        E254488C04

        *a

        Example

        -

        -

        *1

        Refrigerant Passage A

        *2

        Inlet Chamber

        *3

        Variable Suction Side Throttle

        *4

        Crank Pressure Inlet Chamber

        *5

        Compressor Assembly with Pulley

        *6

        High Flow

        *7

        Low Flow

        *8

        Maximum Volume of Refrigerant

        *9

        Controlled Volume of Refrigerant

        -

        -
        V100135

        Crank Chamber Pressure

        		 V100136

        Refrigerant Flow

      4. A Damper Limiter (DL) type air conditioning pulley is used. A cylinder-type damper is used for this compressor assembly with pulley and torque fluctuations have been suppressed, thus making an inertia weight unnecessary. As a result, the weight of the compressor assembly with pulley has been reduced.

        E254489C01

        *1

        Damper Limiter (DL) Type Air Conditioning Pulley

        *2

        Conventional Type Air Conditioning Pulley

        *3

        Damper

        *4

        Inertia Weight

    2. Operation

      1. The crank chamber is connected to the suction passage. A solenoid control valve is provided between the suction passage (low pressure) and the discharge passage (high pressure).

      2. The solenoid control valve operates under duty cycle control in accordance with the signals from the air conditioning amplifier assembly.

        E254490C01

        *1

        Suction Passage

        *2

        Crank Chamber

        *3

        Piston

        *4

        Discharge Passage

        *5

        Solenoid Control Valve

        *6

        Air Conditioning Amplifier Assembly

      3. When the solenoid control valve closes (the solenoid coil is energized), a difference in pressure is created and the pressure in the crank chamber decreases. Then, the pressure applied to the right side of the piston becomes greater than the pressure applied to the left side of the piston. This compresses the spring and tilts the lug plate. As a result, the piston stroke increases and the discharge capacity increases.

        E254491C01

        *1

        Suction Passage

        *2

        Crank Chamber

        *3

        Piston

        *4

        Discharge Passage

        *5

        Solenoid Control Valve

        *6

        Air Conditioning Amplifier Assembly

        *7

        Crank Chamber Pressure + Spring Force

        *8

        Piston Stroke: Large

      4. When the solenoid control valve opens (the solenoid coil is not energized), the difference in pressure disappears. Then, the pressure applied to the left side of the piston becomes the same as the pressure applied to the right side of the piston. Thus, the spring elongates and eliminates the tilt of the lug plate. As a result, there is a small piston stroke and the discharge capacity decreases.

        E254492C01

        *1

        Suction Passage

        *2

        Crank Chamber

        *3

        Piston

        *4

        Discharge Passage

        *5

        Solenoid Control Valve

        *6

        Air Conditioning Amplifier Assembly

        *7

        Crank Chamber Pressure + Spring Force

        *8

        Piston Stroke: Small

  5. NO. 1 COOLER THERMISTOR

    The No. 1 cooler thermistor detects the temperature of the cool air immediately after the evaporator in the form of resistance changes, and outputs it to the air conditioning amplifier assembly.

  6. THERMISTOR ASSEMBLY

    The thermistor assembly detects the outside temperature based on changes in the resistance of its built-in thermistor and sends a signal to the combination meter assembly.

  7. AIR CONDITIONER PRESSURE SENSOR

    The air conditioner pressure sensor detects the refrigerant pressure and outputs it to the air conditioning amplifier assembly in the form of voltage changes.