Automatic Air Conditioner System

AUTOMATIC AIR CONDITIONER SYSTEM

Control System Diagram

CONTROL SYSTEM
The control system consists of input sensors, switches, the A/C auto amp.(microcomputer) and outputs.
The relationship of these components is shown in the figure below:






Control System Description

CONTROL OPERATION






DISPLAY SCREEN
Displays the operational status of the system.

AUTO SWITCH
- The compressor, intake door, air mix doors, outlet doors and blower speed are automatically controlled so that the in-vehicle temperature will reach, and be maintained at the set temperature selected by the operator.
- When pressing AUTO switch, air inlet, air outlet, blower speed, and discharge air temperature are automatically controlled.

TEMPERATURE CONTROL DIAL (DRIVER)
Increases or decreases the set temperature.

TEMPERATURE CONTROL DIAL (PASSENGER)
Increases or decreases the set temperature.

RECIRCULATION SWITCH






DEFROSTER SWITCH






REAR WINDOW DEFOGGER SWITCH
When switch is ON, rear window and door mirrors are defogged.

OFF SWITCH
The compressor and blower are OFF, the intake doors are set to the outside air position, and the air outlet doors are set to the foot (75% foot and 25% defrost) position.

A/C SWITCH
The compressor is ON or OFF.
(Pressing the A/C switch when the AUTO switch is ON will turn off the A/C switch and compressor.)

MODE SWITCH
Controls the air discharge outlets.

FRONT BLOWER CONTROL SWITCHES
Manually control the blower speed.






REAR TEMPERATURE CONTROL DIAL (FRONT/REAR)
The temperature increases or decreases the set temperature.

REAR MODE SWITCHES (FRONT/REAR)
Controls the air discharge outlets.

REAR BLOWER CONTROL DIAL (FRONT)
When the REAR CTRL switch is in the off (indicator off) the rear air control (front) controls the rear blower motor speed regardless of the rear air control (rear) blower control dial (rear) position. The rear air control (front) controls the blower motor speed.

REAR BLOWER CONTROL DIAL (REAR)
When the REAR CTRL switch is in the on (indicator on) the rear air control (rear) controls the rear blower motor speed regardless of the rear air control (front) blower control dial (front) position. The rear air control (rear) controls the blower motor speed.

MAGNET CLUTCH CONTROL






When A/C switch or DEF switch is pressed, A/C auto amp. inputs compressor ON signal to BCM.
BCM sends compressor ON signal to ECM and A/C auto amp., via CAN communication line.

ECM judges whether compressor can be turned ON, based on each sensor status (refrigerant pressure sensor signal, throttle angle sensor, etc.). If it judges compressor can be turned ON, it sends compressor ON signal to IPDM E/R, via CAN communication line.
Upon receipt of compressor ON signal from ECM, IPDM E/R turns air conditioner relay ON to operate compressor.

Discharge Air Flow (Front)






Discharge Air Flow (Rear)






Switches And Their Control Function (Front)






Switches And Their Control Function (Rear)