Mode Door Control System

MODE DOOR CONTROL SYSTEM


Description


SYSTEM DESCRIPTION

Component Parts

Mode door control system components are:
- Auto amp.
- Mode door motor (LCU)
- A/C LAN system (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 door, 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






Mode Door Control Specification






Mode position can be selected manually by pressing MODE switch or DEF switch of the controller. This enables to fix a mode position. Automatic control by auto amp. Pressing AUTO switch allows automatic control by auto amp. During the automatic control of mode position, a mode door position (VENT, B/L, FOOT, or D/F) is selected based on a target air mix door opening angle and sunload depending on a temperature calculated by auto amp. In addition, D/F is selected to prevent windshield fogging only when ambient temperature is extremely low with mode position FOOT.