Air Mix Door Control System

AIR MIX DOOR CONTROL SYSTEM


Description


SYSTEM DESCRIPTION

Component Parts

Air mix door control system components are:
- Auto amp.
- Air mix door motor (LCU)
- A/C LAN system (Position Balanced Resistor [PBR] built-in mode door motor, air mix door motor and intake door motor)
- In-vehicle sensor
- Ambient sensor
- Sunload sensor
- Intake sensor

System Operation
The auto amp. receives data from each of the sensors. The auto amp. sends air mix doors, mode door and intake door opening angle data to the air mix door motor LCUs, mode door motor LCU and intake door motor
LCU.
The air mix door motors, mode door motor and intake door motor read their respective signals according to the address signal. Opening angle indication signals received from the auto amp. and each of the motor position sensors are compared by the LCUs in each door motor with the existing decision and opening angles. Subsequently, HOT/COLD, DEF/VENT and FRE/REC operation is selected. The new selection data are returned to the auto amp.






LAN System Circuit






Air Mix Door Control Specification





When ignition switch is ON, Auto amp. continuously and automatically controls temperatures regardless of air conditioner operational condition. When setting a target temperature with temperature control dial, Auto amp. corrects the set temperature and decides a target air mix door opening angle. Auto amp. controls air mix door according to the target air mix door opening angle and current air mix door opening angle in order to keep an optimum air mix door opening angle. When a temperature is set at 18�C (60�F), air mix door is fixed at full cold, and when a temperature is set at 32�C (90�F), it is set at full hot.