System Description
MANUAL AIR CONDITIONER SYSTEM
System Description
CONTROL OPERATION
A/C control
1. Fan Control Dial
The blower speed is manually controlled with this dial. Twenty-six 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.
- The indicator lamp of A/C switch and REC switch turn ON when the fan control dial is ON by changing the mode control dial to MAX A/C position. In this state, the mode control dial and compressor return to the state that existed before selecting MAX A/C position by switching the air discharge outlets to any position other than MAX A/C.
- Switching the mode control dial from D/F position to FOOT position when the fan control dial is ON turns ON
the indicator lamp of A/C switch, and then operates the compressor.
4. REC (Recirculation) Switch
- Pressing the REC switch switches REC (recirculation) and FRE (fresh air intake) when the air discharge outlets are VENT and B/L. The air inlets are fixed to REC (recirculation) when REC indicator lamp is turned
OFF. They are fixed to FRE (fresh air intake) when REC indicator lamp is turned OFF.
- The indicator lamp of REC switch is turned OFF when the air discharge outlets are FOOT, D/F and DEF.
The air inlets are fixed to FRE (fresh air intake). At this time, the inlets cannot be changed to REC (recirculation) by operating the REC switch.
- The indicator lamp of REC switch is turned ON when the air discharge outlets are at MAX A/C position. The air inlets are fixed to REC (recirculation). At this time, the inlets cannot be changed to FRE (fresh air intake)
by operating the REC switch.
5. 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.)
- When the air discharge outlets are at MAX A/C position, the A/C switch is fixed to ON and cannot be switched to OFF.
6. Rear Window Defogger Switch
When illumination is ON, rear window is defogged.
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 A/C 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 A/C amp., mode door motor, air mix door motor and intake door motor. The A/C 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 A/C 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 (A/C amp. indicated value and motor opening angle comparison)
Operation
The A/C amp. receives signals from its various dials and switches. The A/C 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 A/C 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 A/C amp.
Transmission Data and Transmission Order
A/C amp. data is transmitted consecutively to each of the door motors following the form as shown in the figure below.
- Initial compulsory signal is sent to each of the door motors.
- Data sent from the A/C 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 is normal, 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 A/C amp. This completes one data transmission and control cycle.
