System Description
HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System): SYSTEM DESCRIPTION
1. GENERAL
(a) The air conditioning system has the following controls.
2. NEURAL NETWORK CONTROL
* Neural network control collects data under varying environmental conditions and stores it in the air conditioning amplifier assembly. Neural network control uses this data to enhance air conditioning control.
* Neural network control consists of neurons organized into an input layer, intermediate layer and output layer. The input layer neurons process the input data received from the switches and sensors, which includes the outside temperature, amount of sunlight and room temperature, and outputs this data to the intermediate layer neurons. Based on this data, the intermediate layer neurons adjust the strength of the links among the neurons. The result 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. The air conditioning amplifier assembly then controls the servo motors and blower motor in accordance with the control volumes that have been calculated by neural network control.
3. MODE POSITION AND DAMPER OPERATION
Function of Main Damper
4. AIR OUTLETS AND AIRFLOW VOLUME
HINT
The size of the circle indicates the proportion of airflow volume.
5. A/C LOCK SENSOR
The A/C lock sensor sends A/C pulley speed signals to the air conditioning amplifier assembly. The air conditioning amplifier assembly determines whether the cooler compressor assembly is locked or not by using those signals and engine speed signals.
6. No. 1 COOLER THERMISTOR
The No. 1 cooler thermistor detects the temperature of the cool air immediately after it passes through the evaporator in the form of resistance changes, and outputs the temperature to the air conditioning amplifier assembly.
7. BLOWER WITH FAN MOTOR SUB-ASSEMBLY
The blower with fan motor sub-assembly has a built-in blower controller and is controlled by the air conditioning amplifier assembly using duty control.
8. AIR CONDITIONING HARNESS ASSEMBLY (BUS CONNECTOR)
(a) A BUS connector is used in the wire harness that connects the servo motor to the air conditioning amplifier assembly.
(b) Each BUS connector has a built-in communication/driver IC which communicates with each servo motor connector, actuates the servo motor, and has a position detection function.
9. SERVO MOTOR
(a) The pulse pattern type servo motor detects the relative position using 2-bit on/off signals.
The forward and reverse revolutions of this motor are detected using two signals, A and B, which output four types of patterns. The air conditioning amplifier assembly counts the number of pulse patterns in order to determine the stopped position.
10. QUICK HEATER ASSEMBLY (w/ PTC Heater)
(a) General
(1) The PTC heater is located above the heater core in the air conditioner unit.
(2) The PTC heater consists of a PTC element, aluminum fins and brass plates. When current is applied to the PTC element, it generates heat to warm the air that passes through the unit.
(b) PTC Heater Operating Conditions
(1) The on/off operation of the PTC heater is controlled by the air conditioning amplifier assembly in accordance with the engine coolant temperature, ambient temperature, engine speed, air mix setting and electrical load (generator power ratio).
For example, the number of operating PTC heaters varies according to engine coolant temperature as shown in the graph below.
11. COOLER THERMISTOR (ROOM TEMPERATURE SENSOR)
The cooler thermistor (room temperature sensor) detects the cabin temperature based on changes in the resistance of its built-in thermistor and sends a signal to the air conditioning amplifier assembly.
12. COOLER THERMISTOR (AMBIENT TEMPERATURE SENSOR)
The cooler thermistor (ambient temperature sensor) detects the outside temperature based on changes in the resistance of its built-in thermistor and sends a signal to the air conditioning amplifier assembly.
13. AUTOMATIC LIGHT CONTROL SENSOR (SOLAR SENSOR)
(a) The automatic light control sensor (solar sensor) consists of a photo diode, 2 amplifier circuits for the solar sensor and a frequency converter circuit for the light control sensor.
(b) The automatic light control sensor (solar sensor) detects (in the form of changes in the current that flows through the built-in photo diode) the changes in the amount of sunlight from the LH and RH sides (2 directions) and outputs these sunlight intensity signals to the air conditioning amplifier assembly.
