AIR CONDITIONING SYSTEM SYSTEM DESCRIPTION


  1. GENERAL


    1. The air conditioning system has the following controls.

      Control Outline
      Neural Network Control This control is capable of performing complex control by artificially simulating the information processing method of the nervous system of living organisms in order to establish a complex input/output relationship similar to that of a human brain.
      Outlet Air Temperature Control Based on the temperature set by the temperature control dial, neural network control calculates outlet air temperature based on input signals from various sensors.
      Dual Control*1 The temperature settings for the driver and front passenger are controlled independently in order to provide separate vehicle interior temperatures for the right and left sides of the vehicle. Thus, air conditioning that accommodates the occupants' preferences has been realized.
      Blower Control Controls the blower motor in accordance with the airflow volume that has been calculated by neural network control based on input signals from various sensors.
      Air Outlet Control Automatically switches the air outlets in accordance with the outlet mode that has been calculated by neural network control.
      In accordance with the engine coolant temperature, ambient air temperature, amount of sunlight, required blower, outlet temperature and vehicle speed conditions, this control automatically switches the blower outlet to foot/defroster mode to prevent the windows from becoming fogged up when the ambient air temperature is low.
      Air Inlet Control Automatically controls the air inlet control damper to help achieve the calculated outlet air temperature that is required.
      Drives the air inlet control servo motor according to the operation of the air inlet control switch and moves the dampers to the fresh or recirculation position.
      Electric Inverter Compressor Control The air conditioning amplifier assembly calculates the target speed of the compressor based on the target evaporator temperature (which is calculated by the cooler (room temp. sensor) thermistor, thermistor assembly, automatic light control sensor) and the actual evaporator temperature that is detected by the No. 1 cooler thermistor in order to control the compressor speed.
      The air conditioning amplifier assembly calculates the target evaporator temperature, which includes corrections based on the cooler (room temp. sensor) thermistor, thermistor assembly, the automatic light control sensor, and No. 1 cooler thermistor. Accordingly, the air conditioning amplifier assembly controls the compressor speed to an extent that would not inhibit the proper cooling performance or defogging performance.
      Turns the A/C on automatically when the AUTO button is pressed when the blower is on and the A/C is off.
      Decreases the compressor speed in order to ensure quietness when the vehicle is stopped or the engine is off.
      Pollen Removal Mode Control

      • Activated by the pollen removal mode control switch operation.

      • Switches the air vent to face mode.

      • Sends air which has passed through the clean air filter to the area around the upper part of the bodies of the driver and front passenger. This air is filtered by the clean air filter in order to remove pollen.
      Defroster Control Defroster control logic is used to improve defroster performance.
      PTC Heater Control*2

      When the hybrid system is operating (READY), and the blower motor with fan sub-assembly is turned on, the air conditioning amplifier assembly turns on the quick heater assembly if the conditions listed below are met.


      • Engine coolant temperature is below specified temperature.

      • Outside temperature is below specified temperature.

      • Tentative air mix damper opening angle is above the specified value (MAX HOT).
      Rear Defogger Control

      Refer to Rear Defogger System.

      Click here

      Blower Customize*3 During automatic air conditioning operation, the air volume can be adjusted in 3 levels using the FAST SOFT switch: MEDIUM → SOFT (small air volume) → FAST (large air volume).
      ECO Mode Control When the combination switch assembly (ECO mode switch) is turned on, the air conditioning amplifier assembly limits the air conditioning system performance.
      Diagnosis A Diagnostic Trouble Code (DTC) is stored in memory when the air conditioning amplifier assembly detects a problem with the air conditioning system.
      Memory Call Control

      Memorizes the air conditioning settings when the power switch is turned from on (IG) to off in accordance with the ID code of the electrical key transmitter sub-assembly that is used to operate the vehicle. The memory call control then recalls the settings of the electrical key transmitter sub-assembly used when the power switch is turned on (IG). This function operates when both of the following conditions are met.


      • The driver door is unlocked using the unlock sensor, and then the driver door is opened.

      • Power switch is turned on (IG).

      • *1: for Dual Type

      • *2: w/ PTC Heater

      • *3: w/ Follow Me Home System

  2. NEURAL NETWORK CONTROL


    • In previous automatic air conditioning systems, the air conditioning amplifier assembly determined the required outlet air temperature and blower air volume in accordance with the calculation formula that has been obtained based on information received from the sensors.

      However, because the senses of a person are rather complex, a given temperature is sensed differently, depending on the environment in which the person is situated. For example, a given amount of solar radiation can feel comfortably warm in a cold climate, or extremely uncomfortable in a hot climate. Therefore, as a technique for effecting a higher level of control, a neural network has been adopted in the automatic air conditioning system. With this technique, the data that has been collected under varying environmental conditions is stored in the air conditioning amplifier assembly. The air conditioning amplifier assembly can then effect control to provide enhanced air conditioning comfort.

    • The neural network control consists of neurons in the input layer, intermediate layer and output layer. The input layer neurons process the input data of the outside temperature, the amount of sunlight and the room temperature based on the outputs of the switches and sensors, and output them to the intermediate layer neurons. Based on this data, the intermediate layer neurons adjust the strength of the links among the neurons. The sum of these is then calculated by the output layer neurons in the form of the required outlet temperature, solar correction, target airflow volume and outlet mode control volume. Accordingly, the air conditioning amplifier assembly controls the servo motors and blower motor in accordance with the control volumes that have been calculated by the neural network control.

    A01MTCXE02

  3. MODE POSITION AND DAMPER OPERATION


    1. Mode Position and Damper Operation.

      A01MS5VC02
      *1 Recirculated Air *2 Air Inlet Control Door
      *3 Fresh Air *4 Air Refiner Element
      *5 Blower Motor with Fan Sub-assembly *6 No. 1 Cooler Evaporator Sub-assembly
      *7 Quick Heater Assembly (w/ PTC Heater) *8 Side Register (Front Passenger Side)
      *9 Center Register (Front Passenger Side) *10 Mode Control Door (for Front Passenger Footwell Register)
      *11 Front Footwell Register Duct (Front Passenger Side) *12 Rear Footwell Register Duct
      *13 Console Box Register *14 Front Footwell Register Duct (Driver Side)
      *15 Mode Control Door (for Driver Footwell Register) *16 Center Register (Driver Side)
      *17 Side Register (Driver Side) *18 Side Defroster
      *19 Center Defroster *20 Heater Radiator Unit Sub-assembly
      *21 Inside-and-outside Dual Air Layer Control Door *22 Mode Control Door (for Defroster)
      *23 Air Mix Control Door *24 Mode Control Door (for Front Passenger Center and Side Register)
      *25 Mode Control Door (for Console Box Register and Rear Passenger Footwell Register Duct) *26 Mode Control Door (for Driver Center and Side Register)
      *27 Air Mix Control Door (for Driver Side Upper Layer) *28 Air Mix Control Door (for Driver Side Lower Layer)
      *29 Air Mix Control Door (for Rear Passenger) *30 Air Mix Control Door (for Front Passenger Side Lower Layer)
      *31 Air Mix Control Door (for Front Passenger Side Upper Layer) - -
      *a View from A *b To Center and Side Defrosters
      *c To Driver Side Center and Side Registers *d To Driver Side Footwell Register Duct
      *e To Console Box Register and Rear Footwell Register Duct *f To Front Passenger Side Footwell Register Duct
      *g To Front Passenger Side Center and Side Registers - -
      Control Door Operation Position Door Position Operation
      Air Inlet Control Door FRESH A2, B1 Brings in fresh air.
      RECIRCULATION A1, B2 Recirculates internal air.
      Inside-and-outside Dual Air Layer Control Door - (Auto Control) C1 - C2 Separates or integrates the upper layer and lower layer in response to the control conditions to control the inside-and-outside dual air layers.
      Air Mix Control Door MAX COLD to MAX HOT Temperature Setting

      D1 - D2*1

      E1 - E2*2

      F1 - F2*3

      G1 - G2*4

      H1 - H2*5

      		 Varies the mixture ratio of warm air and cool air in order to continuously regulate the temperature between hot and cold.
      Mode Control Door (for All Seat Control Modes) A01MRPH FACE J1, K1, L1, M1, N3, O1, I3 Air blows out of the front center register, side register and console box register.
      A01MRUC BI-LEVEL J2, K2, L2, M2, N2, O2, I3 Air blows out of the front center register, side register, console box register and front and rear footwell register ducts. Air may blow out from the center defroster and side defroster depending on the cabin environment (I2).
      A01MSSU FOOT J3, K3, L3, M3, N2, O3, I3*6 or I2*7 Air blows out of the front footwell register and rear footwell register ducts. In addition, air blows out slightly from the front center register, side register and console box register. Air blows out slightly from the center defroster and side defroster when FOOT MODE is turned on by the automatic control.
      A01MSO3 FOOT AND DEFROSTER J3, K3, L2, M2, N2, O2, I1 Defrosts the windshield through the center defroster and side defroster, while air is also blown out from the front footwell register and rear footwell register ducts. In addition, air blows out slightly from the front center register, side register and console box register.
      A01MTY7 DEFROSTER J4, K4, L1, M1, O1, I1 Defrosts the windshield through the center defroster and side defroster ducts.
      Mode Control Door (for Front Seat Control Modes) A01MRPH FACE J1, K1, L1, M1, N1, O1, I3 Air blows out of the front center register and side register
      A01MRUC BI-LEVEL J2, K2, L2, M2, N1, O1, I3 Air blows out of the front center register, side register and front footwell register ducts. Air may blow out from the center defroster and side defroster depending on the cabin environment (I2).
      A01MSSU FOOT J3, K3, L3, M3, N1, O1, I3*6 or I2*7 Air blows out of the front footwell register. In addition, air blows out slightly from the front center register and side register. Air blows out slightly from the center defroster and side defroster when FOOT MODE is turned on by the automatic control.
      A01MSO3 FOOT AND DEFROSTER J3, K3, L2, M2, N1, O1, I1 Defrosts the windshield through the center defroster and side defroster, while air is also blown out from the front footwell register. In addition, air blows out slightly from the front center register and side register.
      A01MTY7 DEFROSTER J4, K4, L1, M1, N1, O1, I1 Defrosts the windshield through the center defroster and side defroster ducts.

      • *1: For driver side front register and side register

      • *2: For front passenger side front register and side register

      • *3: For driver side front footwell register

      • *4: For console box register and rear footwell register ducts

      • *5: For front passenger side front footwell register

      • *6: When FOOT MODE is selected by a manual operation.

      • *7: When FOOT MODE is turned on by the automatic control or FOOT MODE is selected by a manual operation from except FOOT MODE.

  4. AIR OUTLETS AND AIRFLOW VOLUME


    1. Air Outlets and Airflow Volume (for All Seat Control Modes)

      A01MT2RN01
      Mode Selection FACE FOOT DEF
      Auto Manual Center Side Rear Front Rear F
      A B C D E

      FACE-U

      A01MRPH       		A01MSC5 A01MRGY A01MTRW A01MTRW A01MTRW A01MRGY A01MRGY A01MRGY

      FACE-L

      A01MRPH       		A01MSC5 A01MRGY A01MT3Y A01MT3Y A01MT3Y A01MSGZ A01MSGZ A01MRGY

      FACE-R

      A01MRPH       		A01MSC5 A01MSC5 A01MRKG A01MRKG A01MRKG A01MRGY A01MRGY A01MRGY

      B/L

      A01MRUC       		A01MSC5 A01MSC5 A01MRKG A01MRKG A01MRKG A01MRKG A01MRKG A01MRGY

      FOOT-D

      A01MSSU       		A01MSC5 A01MRGY A01MSGZ A01MSGZ A01MSGZ A01MRKG A01MRKG A01MSC5

      FOOT-R

      A01MSSU       		A01MSC5 A01MSC5 A01MSGZ A01MSGZ A01MSGZ A01MRKG A01MRKG A01MSGZ

      FOOT-F

      A01MSSU       		A01MSC5 A01MRGY A01MSGZ A01MSGZ A01MSGZ A01MT3Y A01MSGZ A01MSGZ

      FOOT/DEF

      A01MSO3       		A01MSC5 A01MSC5 A01MSGZ A01MSGZ A01MSGZ A01MSC5 A01MSGZ A01MT3Y

      DEF

      A01MTY7       		A01MSC5 A01MSC5 A01MRGY A01MRGY A01MRGY A01MRGY A01MRGY A01MTRW

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

    2. Air Outlets and Airflow Volume (for Front Seat Control Modes)

      A01MT1LN01
      Mode Selection FACE FOOT DEF
      Auto Manual Center Side Rear Front Rear F
      A B C D E

      FACE-U

      A01MRPH       		A01MSC5 A01MRGY A01MTRW A01MTRW A01MRGY A01MRGY A01MRGY A01MRGY

      FACE-L

      A01MRPH       		A01MSC5 A01MRGY A01MT3Y A01MT3Y A01MRGY A01MSGZ A01MRGY A01MRGY

      FACE-R

      A01MRPH       		A01MSC5 A01MSC5 A01MRKG A01MRKG A01MRGY A01MRGY A01MRGY A01MRGY

      B/L

      A01MRUC       		A01MSC5 A01MSC5 A01MRKG A01MRKG A01MRGY A01MRKG A01MRGY A01MRGY

      FOOT-D

      A01MSSU       		A01MSC5 A01MRGY A01MSGZ A01MSGZ A01MRGY A01MRKG A01MRGY A01MSC5

      FOOT-R

      A01MSSU       		A01MSC5 A01MSC5 A01MSGZ A01MSGZ A01MRGY A01MRKG A01MRGY A01MSGZ

      FOOT-F

      A01MSSU       		A01MSC5 A01MRGY A01MSGZ A01MSGZ A01MRGY A01MT3Y A01MRGY A01MSGZ

      FOOT/DEF

      A01MSO3       		A01MSC5 A01MSC5 A01MSGZ A01MSGZ A01MRGY A01MSC5 A01MRGY A01MT3Y

      DEF

      A01MTY7       		A01MSC5 A01MSC5 A01MRGY A01MRGY A01MRGY A01MRGY A01MRGY A01MTRW

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

  5. PARKING FRESH CONTROL

    When 60 seconds have elapsed since the ignition switch has been turned off, the air conditioning amplifier assembly uses control logic which automatically changes the air inlet to FRESH mode to purge undesired odors from the air conditioning unit.

    This logic will therefore reduce undesired odors upon starting the air conditioning system.

    A01MSNXE01

  6. COMPRESSOR WITH MOTOR ASSEMBLY


    1. General

      Tech Tips

      In order to ensure the proper insulation of the internal high-voltage portion of the compressor and the compressor housing, this vehicle has adopted a compressor oil (ND-OIL 11) with a high level of insulation performance. Therefore, never use a compressor oil other than ND-OIL 11 type compressor oil or its equivalent.


      1. Along with the use of the hybrid system on this vehicle, an electric inverter compressor that is driven by a motor is used. The basic construction and operation of this compressor are the same as an ordinary scroll compressor, except that it is driven by an electric motor.

      2. The Air Conditioning (A/C) inverter is integrated with the compressor.

      3. The electric motor is actuated by 3-phase alternating current (244.8 V) supplied by the A/C inverter. As a result, the air conditioning control system on this vehicle is actuated without depending on the operation of the engine, thus realizing a comfortable air conditioning system and low fuel consumption.

      4. Due to the use of an electric inverter compressor, the compressor speed can be controlled at the required speed calculated by the air conditioning amplifier assembly. Thus, the cooling and dehumidification performance and power consumption have been optimized.

      5. Low-moisture permeation hoses are used for the suction and discharge hoses at the compressor in order to minimize the entry of moisture into the refrigeration cycle.

      6. The compressor uses high-voltage alternating current. If a short or open circuit occurs in the compressor, the hybrid vehicle control ECU assembly will cut off the A/C inverter circuit in order to stop the power supply to the compressor motor.

    2. Compressor Speed Control


      1. The air conditioning amplifier assembly calculates the target compressor speed based on the target evaporator temperature (calculated from the temperature control switch, cooler (room temp. sensor) thermistor, thermistor assembly, and automatic light control sensor) and the actual evaporator temperature detected by the No. 1 cooler thermistor. Then, the air conditioning amplifier assembly transmits the target speed to the hybrid vehicle control ECU assembly. The hybrid vehicle control ECU assembly controls the A/C inverter based on the target speed data in order to control the compressor to a speed that suits the operating condition of the air conditioning system.

      2. The air conditioning amplifier assembly calculates the target evaporator temperature, which includes corrections based on the cooler (room temp. sensor) thermistor, thermistor assembly, automatic light control sensor, and No. 1 cooler thermistor. Accordingly, the air conditioning amplifier assembly controls the compressor speed to an extent that does not inhibit proper cooling performance or defogging performance. As a result, comfort and low fuel consumption can be realized.

  7. 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.

  8. BLOWER MOTOR WITH FAN SUB-ASSEMBLY

    The blower motor has a built-in blower controller, and is controlled using duty control performed by the air conditioning amplifier assembly.

  9. POLLEN REMOVAL MODE CONTROL


    1. When the pollen removal mode switch is pressed, pollen removal mode control is activated.

    2. Then, the air vent is switched to face mode and recirculated pollen-free air flows in the area around the upper part of the bodies of the driver and front passenger.

    3. When the pollen removal mode switch signal is input to the air conditioning amplifier assembly, the air conditioning amplifier assembly controls the compressor with motor assembly, air inlet control servo motor, air outlet control servo motor and blower motor as shown in the timing chart below.

    4. This control usually operates for approximately 3 minutes. However, when the outside temperature is low (5°C (41°F) maximum), it will operate for approximately 1 minute.

    5. After this control stops operating, the air conditioning amplifier assembly controls the air conditioning system using AUTO mode.

      A01MTOSE22

  10. BUS CONNECTOR (AIR CONDITIONING HARNESS ASSEMBLY)


    1. Bus connectors are used in the wire harness that connects the servo motors to the air conditioning amplifier assembly.

      A01MTSHC01
      *a Example *b

      Bus Connector

      (to No. 5 Air Conditioning Radiator Damper Servo Sub-assembly (Driver Side Lower Air Mix))
      *c

      Bus Connector

      (to No. 2 Air Conditioning Radiator Damper Servo Sub-assembly (Driver Side Upper Air Mix))

      		 *d

      Bus Connector

      (to No. 3 Air Conditioning Radiator Damper Servo Sub-assembly)
      *e

      Bus Connector

      (to No. 1 Air Conditioning Radiator Damper Servo Sub-assembly)

      		 *f

      Bus Connector

      (to No. 2 Air Conditioning Radiator Damper Servo Sub-assembly (Front Passenger Side Upper Air Mix))
      *g

      Bus Connector

      (to No. 4 Air Conditioning Radiator Damper Servo Sub-assembly (Front Passenger Side Lower Air Mix))

      		 *h

      Bus Connector

      (to No. 1 Blower Damper Servo Sub-assembly)
      *i to Air Conditioning Amplifier Assembly *j to No. 1 Cooler Thermistor

    2. Each bus connector has a built-in communication/driver IC which communicates with the air conditioning amplifier assembly, actuates the servo motor, and has a position detection function. This enables bus communication for the servo motor wire harness, for a more lightweight construction and a reduced number of wires.

      A01MRW1E13

  11. SERVO MOTOR

    A pulse pattern type servo motor consists of a printed circuit board and a servo motor. The printed circuit board has three contact points, and can transmit two ON-OFF signals to the air conditioning amplifier assembly based on the difference of the pulse phases. The bus connector can detect the damper position and movement direction with these signals.

    A01MSZIE09

  12. QUICK HEATER ASSEMBLY


    1. General


      1. The quick heater assembly is located above the heater core in the air conditioning radiator assembly.

      2. The quick heater assembly consists of a PTC element, aluminum fins, and brass plates. When current is applied to the PTC element, it generates heat to warm the air that passes through the unit.

        A01MTGIC02
        *1 Quick Heater Assembly *2 Brass Plate
        *3 PTC Element *4 Aluminum Fin

    2. Quick Heater Assembly Operating Conditions


      1. The quick heater assembly is turned on and off by the air conditioning amplifier assembly in accordance with the engine coolant temperature, ambient temperature, temperature setting, and electrical load (generator power ratio).

  13. ECO MODE CONTROL

    Under the control of ECO mode, the air conditioning amplifier assembly restricts the air conditioning system performance under specified conditions, thus improving fuel economy.

  14. COOLER (ROOM TEMP. SENSOR) THERMISTOR

    The cooler (room temp. sensor) thermistor detects the cabin temperature based on changes in the resistance of its built-in thermistor and sends a signal to the air conditioning amplifier assembly.

  15. 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 air conditioning amplifier assembly.

  16. AUTOMATIC LIGHT CONTROL SENSOR

    The automatic light control sensor detects (in the form of changes in the current that flows through the built-in photo diode) the changes in the amount of sunlight and outputs these sunlight strength signals to the air conditioning amplifier assembly.

  17. 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.