AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System with Side-mounted Air Conditioner Pressure Sensor) SYSTEM DESCRIPTION

• In previous automatic air conditioning systems, the air conditioning amplifier assembly determined the required outlet air temperature and blower air volume in accordance with the calculation formula that has been obtained based on information received from the sensors.

  However, because the senses of a person are rather complex, a given temperature is sensed differently, depending on the environment in which the person is situated. For example, a given amount of solar radiation can feel comfortably warm in a cold climate, or extremely uncomfortable in a hot climate. Therefore, as a technique for effecting a higher level of control, a neural network has been adopted in the automatic air conditioning system. With this technique, the data that has been collected under varying environmental conditions is stored in the air conditioning amplifier assembly. The air conditioning amplifier assembly can then effect control to provide enhanced air conditioning comfort.

• The neural network control consists of neurons in the input layer, intermediate layer and output layer. The input layer neurons process the input data of the outside temperature, the amount of sunlight and the room temperature based on the outputs of the switches and sensors, and output them to the intermediate layer neurons. Based on this data, the intermediate layer neurons adjust the strength of the links among the neurons. The sum of these is then calculated by the output layer neurons in the form of the required outlet temperature, solar correction, target airflow volume and outlet mode control volume. Accordingly, the air conditioning amplifier assembly controls the servo motors and blower motor in accordance with the control volumes that have been calculated by the neural network control.

Mode Position and Damper Operation

*1	Driver Side Air Mix Control Damper	*2	Front Passenger Side Air Mix Control Damper
*3	Driver Side Defroster	*4	Front Defroster
*5	Front Passenger Side Defroster	*6	Air Inlet Control Damper (Lower Side)
*7	Air Inlet Control Damper (Upper Side)	*8	Clean Air Filter
*9	Blower with Fan Motor Sub-assembly	*10	No. 1 Cooler Evaporator Sub-assembly
*11	Air Mix Control Damper	*12	Heater Radiator Unit Sub-assembly
*13	Mode Switching Damper	*14	Driver Side Footwell Register
*15	Front Passenger Side Footwell Register	*16	Driver Side Register
*17	Center Register	*18	Front Passenger Side Register
*a	Illustration Image View from [A]	*b	[A] View
*c	Recirculated Air	*d	Fresh Air

Functions of Main Dampers

Control Damper	Operation Position	Damper Position	Operation
Air Inlet Control Damper	FRESH	A1, B1	Allows fresh air to enter.
	RECIRCULATION	A2, B2	Causes internal air to recirculate.
Air Mix Control Damper	Temperature Setting: 16°C (61°F) to 30°C (86°F)	C1 - C2	Varies the driver side mixture ratio of the fresh air and the recirculation air in order to regulate the temperature continuously from HI to LO.
		D2 - D1	Varies the front passenger side mixture ratio of the fresh air and the recirculation air in order to regulate the temperature continuously from HI to LO.
Air Outlet Control Damper	DEF	F, H, K	Defrosts the windshield through the center defroster, side defrosters and side registers.
	FOOT/DEF	F, H, J to K	Defrosts the windshield through the center defroster, side defrosters and side registers, while air is also blown out from the front and rear footwell register ducts.
	FOOT	E, (E to F)*, H, J	Air blows out of the front and rear footwell register ducts and side registers. In addition, air blows out slightly from the center defroster and side defrosters.
	B/L	E, G to I, J to K	Air blows out of the center registers, side registers and front and rear footwell register ducts.
	FACE	E, G, K	Air blows out of the center registers and side registers.

The size of each circle ○ indicates the ratio of airflow volume.

1. Air Outlets and Airflow Volume.

   

   Mode	FACE		FOOT	DEF
   	Center	Side	Front	Center	Side
   	A	B	C	D	E
   FACE
   B/L
   FOOT
   FOOT/DEF
   DEF

When 60 seconds have elapsed since the ignition switch has been turned off, the air conditioning amplifier assembly uses control logic which automatically changes the air inlet to FRESH mode to purge undesired odors from the air conditioning unit.

This logic will therefore reduce undesired odors upon starting the air conditioning system.

1. General:

   
   

   1. The compressor is a continuously variable capacity type in which its capacity can be varied in accordance with the cooling load of the air conditioning system.

      

      *1	Shoe	*2	Crank Chamber
      *3	Shaft	*4	Lug Plate
      *5	Piston	*6	Cylinder
      *7	Solenoid Control Valve	-	-

2. Solenoid Valve Operation:

   
   

   1. The crank chamber is connected to the suction passage. A solenoid valve is provided between the suction passage (low pressure) and the discharge passage (high pressure).

   2. The solenoid valve operates under duty cycle control in accordance with the signals from the air conditioning amplifier assembly.

      

      *1	Suction Passage	*2	Crank Chamber
      *3	Piston	*4	Discharge Passage
      *5	Solenoid Control Valve	*6	Air Conditioning Amplifier Assembly

   3. When the solenoid control valve closes (the solenoid coil is energized), a difference in pressure is created and the pressure in the crank chamber decreases. Then, the pressure applied to the right side of the piston becomes greater than the pressure applied to the left side of the piston. This compresses the spring and tilts the lug plate. As a result, the piston stroke increases and the discharge capacity increases.

      

      *1	Suction Passage	*2	Crank Chamber
      *3	Piston	*4	Discharge Passage
      *5	Solenoid Control Valve	*6	Air Conditioning Amplifier Assembly
      *a	Crank Chamber Pressure + Spring Force	*b	Piston Stroke: Large

   4. When the solenoid control valve opens (the solenoid coil is not energized), the difference in pressure disappears. Then, the pressure applied to the left side of the piston becomes the same as the pressure applied to the right side of the piston. Thus, the spring elongates and eliminates the tilt of the lug plate. As a result, there is a small piston stroke and the discharge capacity decreases.

      

      *1	Suction Passage	*2	Crank Chamber
      *3	Piston	*4	Discharge Passage
      *5	Solenoid Control Valve	*6	Air Conditioning Amplifier Assembly
      *a	Crank Chamber Pressure + Spring Force	*b	Piston Stroke: Small

1. The ion generator sub-assembly operates when the blower switch are on.

2. The ion generator sub-assembly emits "nanoe" ions that are electrically charged and encapsulated with water. The ions are discharged into the cabin through the side register (front passenger side) to provide skin-friendly clean air.*

   CAUTION:

   Do not attempt to disassemble or repair the ion generator sub-assembly because it contains high voltage parts.

   

   Note

   Do not insert anything into the side register (front passenger side), attach anything to it, or use sprays around it. Doing so may cause the ion generator sub-assembly to not work properly.

   Tech Tips

   
   

   • *: According to the temperature and humidity conditions, fan speed and air outlet mode selected, the ion generator sub-assembly may not operate at full capacity.

   • When the ion generator sub-assembly operates, a small amount of ozone is emitted and may be faintly smelled in some situations. However, this is approximately the same as the amount that already exists in nature, such as in forests, and as such has no effect on the human body.

   • A slight noise may be heard during operation. This does not indicate a malfunction.

   

   *1	Ion Generator Sub-assembly	*2	Air Conditioning Control Assembly (nanoe indicator)
   *a	Common Negative Ion	*b	"nanoe" Ion
   *c	H2O	*d	Electron

   Tech Tips

   "nanoe" is a trademark of Panasonic Co., Ltd.

1. Bus connectors are used in the wire harness that connects the servo motors to the air conditioning amplifier assembly.

   

   *a	Bus Connector (to No. 1 Air Conditioning Radiator Damper Servo Sub-assembly)	*b	Bus Connector (to No. 1 Blower Damper Servo Sub-assembly)
   *c	to No. 1 Cooler Thermistor (Evaporator Temperature Sensor)	*d	to Air Conditioning Amplifier Assembly

2. Each bus connector has a built-in communication/driver IC which communicates with the air conditioning amplifier assembly, actuates the servo motor, and has a position detection function. This enables bus communication for the servo motor wire harness, for a more lightweight construction and a reduced number of wires.