System Description

AUTOMATIC AIR CONDITIONER SYSTEM

System Description


CONTROL OPERATION

Controller










1. Fan Control Dial
The blower speed is automatically or manually controlled with this dial. 25th speeds are available for manual control.
2. Temperature Control Dial (Potentio Temperature Control)
The set temperature is increased or decreased with this dial.
3. Mode Control Dial
The air discharge outlets is controlled by this dial.
Mode doors are set to the DEF position with this dial. Also, intake doors are set to the outside air position. When shifting mode control dial to DEF position under the following conditions, compressor is turned ON. (A/C indicator ON)
- Fan control dial: Except OFF
- A/C switch: OFF
4. Rear Window Defogger Switch
When illumination is ON, rear window is defogged.
5. Intake Switch
- When intake switch is ON, FRE indicator turns ON, and air inlet is fixed to FRE.
- When intake switch is pressed again, REC indicator turns ON, and air inlet is fixed to REC.
- When intake switch is pressed for approximately 1.5 seconds or longer, REC and FRE indicator blink twice.
Then, automatic control mode is entered. Inlet status is displayed even during automatic control.
- Intake switch is automatically fixed to FRE mode when mode control dial is turned in DEF, or when compressor is turned from ON to OFF. Press intake switch to enter REC mode.
6. A/C Switch
Compressor is ON or OFF with this switch.
(Pressing the A/C switch when the fan control dial is ON turns OFF the A/C switch and compressor.)

DISCHARGE AIR FLOW







AIR DISTRIBUTION

Without Rear Foot Duct





With Rear Foot Duct






SWITCHES AND THEIR CONTROL FUNCTION






NOTE:
Ventilator door has center ventilator openings and side ventilator openings, side ventilator opening cannot be completely closed.






AIR CONDITIONER LAN CONTROL SYSTEM

The LAN (Local Area Network) system consists of auto amp., mode door motor, air mix door motor and intake door motor.
A configuration of these components is as shown in the figure below.






SYSTEM CONSTRUCTION

A small network is constructed between the auto amp., mode door motor, air mix door motor and intake door motor. The auto amp. and motors are connected by data transmission lines and motor power supply lines. The
LAN network is built through the ground circuits of each door motor.
Addresses, motor opening angle signals, motor stop signals and error checking messages are all transmitted through the data transmission lines connecting the auto amp. and each door motor.
The following functions are contained in LCUs built into the mode door motor, the air mix door motor and the intake door motor.
- Address
- Motor opening angle signals
- Data transmission
- Motor stop and drive decision
- Opening angle sensor (PBR function)
- Comparison
- Decision (Auto amp. indicated value and motor opening angle comparison)





Operation
The auto amp. receives data from each of the sensors. The auto amp. sends mode door, air mix door and intake door opening angle data to the mode door motor LCU, air mix door motor LCU and intake door motor LCU.
The mode door motor, air mix 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 is 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 is returned to the auto amp.





Transmission Data and Transmission Order
Auto amp. data is transmitted consecutively to each of the door motor following the form as shown in the figure below.
- Initial compulsory signal is sent to each of the door motors.
- Data sent from the auto amp. are selected according to data-based decisions made by the mode door motor, air mix door motor and intake door motor.
- If the addresses are identical, the opening angle data and error check signals are received by the door motor
LCUs. The LCUs then make the appropriate error decision. If the opening angle data have no error, door control begins.
- If an error exists, the received data are rejected and corrected data received. Finally, door control is based upon the corrected opening angle data.
- Data that shows the indicated door opening angle of each door motor.
- In this procedure, transmitted and received data is checked for errors. Error data are then compiled. The error check prevents corrupted data from being used by the mode door motor, the air mix door motor and the intake door motor. Error data can be related to the following symptoms.
- Malfunction of electrical frequency
- Poor electrical connections
- Signal leakage from transmission lines
- Signal level fluctuation
- At the end of each transmission, a stop operation, in-operation, or internal malfunction message is delivered to the auto amp. This completes one data transmission and control cycle.