System Outline

The air conditioning system operates when the SW on the multi-display or the one on the steering wheel is turned on. Turning on the SW sends a signal to A/C control assembly, which activates the air conditioning system.

1. Heater Blower Operation 

   Manual operation

   When the blower speed is set to a certain level using the blower control SW, the A/C control assembly sends signals to the blower control to control the blower motor speed.

   Auto operation

   When the auto SW is pushed, the A/C control assembly calculates the necessary blower speed from the SW settings and data received from the sensors and automatically sends signals to the blower control to control the blower motor speed.

2. Air Inlet Control Servo Motor Control 

   When the FRESH/RECIRC select SW is set to RECIRC, the air inlet control servo motor starts rotating to move the damper toward the RECIRC side. The damper position is detected by TERMINAL TPI of the A/C control assembly. The motor continuously rotates until the damper reaches its stop position. When the FRESH/RECIRC select SW is set to FRESH, the air inlet control servo motor starts rotating to move the damper toward the FRESH side. The damper position is detected by TERMINAL TPI of the A/C control assembly. The motor continuously rotates until the damper reaches its stop position.

   In auto mode, the A/C control assembly controls the damper to move to the best position for the conditions without operating the mode select SW.

3. Air Vent Mode Control Servo Motor Control 

   When the mode select SW is pushed, the ECU in the A/C control assembly activates the air vent mode control servo motor. The servo motor rotates to the position (FACE, BI-LEVEL, FOOT, FOOT/DEF, DEF) selected by using the mode select SW, and moves the damper.

   In auto mode, the A/C control assembly controls the damper to move to the best position for the conditions without operating the mode select SW.

4. Air Mix Control Servo Motor Control 

   Based on the temperature set on the temperature control SW, the ECU in the A/C control assembly sends a signal to the air mix control servo motor. This signal drives the motor to reach the temperature set by the temperature control SW, and moves the film damper.

5. Humidity Sensor Control 

   The A/C control assembly detects the humidity in passenger cabin when the A/C is turned on, utilizing the humidity detection function of the A/C room temp. sensor, and if needed begins to dehumidify the cabin to create a comfortable environment.

6. Air Conditioning Operation 

   The A/C control assembly calculates the target cooling temperature from information such as that of operating SWs, room temperature, humidity, ambient temperature and insulation to set the target running speed for the compressor assembly (Motor). The calculated control signal is sent to inverter to drive the compressor assembly (Motor) (Electric motor) and control the inverter, resulting in the A/C operating.