Toyota Camry Hybrid AHV40 Manual page 319

BE-58
2. Neural Network Control
D In previous automatic air conditioning systems, the A/C ECU determined the required outlet air
temperature and blower air volume in accordance with a calculation formula and based on information
received from the sensors. However, because people's senses 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 is used in
the automatic air conditioning system. With this technique, data that has been collected under varying
environmental conditions is stored in the A/C ECU. The A/C ECU can then effect control to provide
enhanced air conditioning comfort.
D 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. The A/C ECU
controls the servo motors and blower motor in accordance with the control volumes that have been
calculated by the neural network control.
Input
Processing
Temp. Setting
Sensor Input
Switch Input
: Neural Network Operation Range
BODY ELECTRICAL - AIR CONDITIONING
Control
Neural
Networking
Target Outlet
Temp.
Temp. Control
Correction
Amount of
Sunlight Correction
Various Types of
Target Airflow
Airflow Volume
Volume
Corrections
Various Types
Outlet Mode
of Mode
Corrections
Various Types
Inlet Mode
of Corrections
Compressor
Intermediate Layer
Output
Processing
Input Layer
Air Mix Control
Outside
Damper
Temp.
Amount of
Sunlight
Blower Motor
Mode Control
Room
Damper
Temp.
Air Inlet Control
Damper
Compressor
Output Layer
Target Output
Temp.
189BE109