Heating and Air Conditioning: Description and Operation
HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: SYSTEM DIAGRAM
Communication Table
* *1: w/ Navigation System
* *2: w/o Navigation System
* *3: w/ Rear Air Conditioning System
SYSTEM DESCRIPTION
1. GENERAL
(a) The air conditioning system has the following controls.
2. NEURAL NETWORK CONTROL
Neural network control collects data under varying environmental conditions and stores it in the air conditioning amplifier assembly. Neural network control uses this data to enhance air conditioning control.
Neural network control consists of neurons organized into an input layer, intermediate layer and output layer. The input layer neurons process the input data received from the switches and sensors, which includes the outside temperature, amount of sunlight and room temperature, and outputs this data to the intermediate layer neurons. Based on this data, the intermediate layer neurons adjust the strength of the links among the neurons. The result 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. The air conditioning amplifier assembly then controls the servo motors and blower motor in accordance with the control volumes that have been calculated by neural network control.
3. AUTOMATIC RECIRCULATION CONTROL (w/ Rear Air Conditioning System)
(a) When the automatic recirculation control is operating, the air conditioning amplifier assembly automatically changes the air inlet mode to the fresh air or recirculate air mode based on signals from the smog ventilation sensor, ambient temperature and room temperature sensors when the AUTO air inlet mode is selected.
(1) The air conditioning amplifier assembly detects harmful elements (CO, HC, and NOx) based on a smog ventilation sensor signal and automatically switches the air inlet mode to the recirculate air mode to prevent such harmful elements from entering the cabin.
(2) The air conditioning amplifier assembly detects cabin temperature based on a room temperature sensor signal and automatically switches the air inlet mode to the recirculate air mode to cool down the cabin temperature quickly.
(3) The air conditioning amplifier assembly detects the outside temperature based on an ambient temperature sensor signal and automatically switches the air inlet mode to the fresh air mode to prevent the windshield from fogging up.
NOTICE:
The smog ventilation sensor cannot detect elements such as the smoke from a bonfire or factory exhaust, foul or animal odors, and dirt or dust particles. Therefore, the air inlet mode is not switched automatically in accordance with those elements.
4. MEMORY CALL CONTROL
(a) Memory call control memorizes the air conditioning system settings together with the ID code of the key that is being used.
(b) When a key with memory is used to unlock the door, while the driver door is opened and the engine switch is turned on (IG), the memorized air conditioning system settings will be recalled.
(c) The certification ECU will recognize the key during the unlock operation by reading the registered ID code.
(d) Using this control, the air conditioning system setting preference that corresponds to each key can be memorized, enhancing usability.
(e) The following air conditioning system settings can be memorized:
Front Air Conditioning Unit
Rear Air Conditioning Unit (w/ Rear Air Conditioning System)
*1: w/ Navigation System
*2: w/o Navigation System
5. POLLEN REMOVAL MODE CONTROL
(a) When the pollen removal mode switch is pressed, the pollen removal mode control is activated. Then, the air vent is switched to the FACE mode and recirculated pollen free air flows in the area around the upper parts of the bodies of the driver and front passenger.
(1) When the pollen removal mode switch signal is input to the air conditioning amplifier assembly, the air conditioning amplifier assembly controls the magnet clutch assembly, recirculation damper servo sub-assembly, No. 1 air conditioning radiator damper servo sub-assembly (mode damper servo) and blower with fan motor sub-assembly as shown in the timing chart.
(2) This control usually operates for approximately 3 minutes.
(3) After this control stops operating, the air conditioning amplifier assembly automatically returns to the mode it was in just before the pollen removal mode switch was pressed.
6. MODE POSITION AND DAMPER OPERATION
(a) Mode Position and Damper Operation
(1) Front Air Conditioning Unit
Function of Main Damper
(2) Rear Air Conditioning Unit (w/ Rear Air Conditioning System)
Function of Main Damper
7. AIR OUTLETS AND AIRFLOW VOLUME
(a) Air Outlets and Airflow Volume
(1) for Front Registers
*: w/o Rear Air Conditioning System
HINT
The size of the circle indicates the proportion of airflow volume.
(2) for Rear Registers (w/ Rear Air Conditioning System)
HINT
The size of the circle o indicates the ratio of airflow volume.
8. A/C LOCK SENSOR
The A/C lock sensor sends A/C pulley speed signals to the air conditioning amplifier assembly. The air conditioning amplifier assembly determines whether the cooler compressor assembly is locked or not by using those signals and engine speed signals.
9. No. 1 COOLER THERMISTOR
The No. 1 cooler thermistor detects the temperature of the cool air immediately after it passes through the evaporator in the form of resistance changes, and outputs the temperature to the air conditioning amplifier assembly.
10. BLOWER WITH FAN MOTOR SUB-ASSEMBLY
The blower with fan motor sub-assembly has a built-in blower controller and is controlled by the air conditioning amplifier assembly using duty control.
11. AIR CONDITIONING HARNESS ASSEMBLY (BUS CONNECTOR)
(a) A BUS connector is used in the wire harness that connects the servo motor to the air conditioning amplifier assembly.
(b) Each BUS connector has a built-in communication/driver IC which communicates with each servo motor connector, actuates the servo motor, and has a position detection function.
12. SERVO MOTOR
(a) The pulse pattern type servo motor detects the relative position using 2-bit on/off signals.
The forward and reverse revolutions of this motor are detected using two signals, A and B, which output four types of patterns. The air conditioning amplifier assembly counts the number of pulse patterns in order to determine the stopped position.
13. COOLER THERMISTOR (ROOM TEMPERATURE SENSOR)
The cooler thermistor (room temperature sensor) 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.
14. COOLER THERMISTOR (AMBIENT TEMPERATURE SENSOR)
The cooler thermistor (ambient temperature sensor) 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.
15. SMOG VENTILATION SENSOR (w/ Rear Air Conditioning System)
(a) The smog ventilation sensor detects harmful elements such as CO, HC and NOx present in the air outside of the vehicle. The sensor outputs a signal to the air conditioning amplifier assembly.
(b) The sensitivity of the smog ventilation sensor can be adjusted. Adjustment can be done using the display and navigation module display.
16. AUTOMATIC LIGHT CONTROL SENSOR (SOLAR SENSOR)
(a) The automatic light control sensor (solar sensor) consists of a photo diode, 2 amplifier circuits for the solar sensor and a frequency converter circuit for the light control sensor.
(b) The automatic light control sensor (solar 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 from the LH and RH sides (2 directions) and outputs these sunlight intensity signals to the air conditioning amplifier assembly.
