Target Temperature Operation [Full-Auto Air Conditioner]; Target Temperature Calculation; Airflow Temperature Control Outline [Full-Auto Air Conditioner]; Features - Mazda RX-8 2009 Service Highlights

CONTROL SYSTEM [FULL-AUTO AIR CONDITIONER]

TARGET TEMPERATURE OPERATION [FULL-AUTO AIR CONDITIONER]

Target Temperature Calculation

The target temperature is calculated using the following formula based on input from the cabin temperature
sensor, the ambient temperature sensor and the solar radiation sensor, in addition to the temperature set by the
climate control unit.
Target temperature = (K
solar radiation temperature) + K
K -K : Control coefficient
1 5
C : Correction coefficient
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AIRFLOW TEMPERATURE CONTROL OUTLINE [FULL-AUTO AIR CONDITIONER]

NG: AIRFLOW TEMPERATURE CONTROL

Features

The airflow temperature is consistently controlled automatically. The A/C amplifier controls the airflow
temperature by the air mix actuator.
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AIRFLOW TEMPERATURE CONTROL SYSTEM DIAGRAM [FULL-AUTO AIR CONDITIONER]

CABIN
SET TEMPERATURE
TEMPERATURE
AMBIENT
SOLAR RADIATION
TEMPERATURE
AMOUNT
ENGINE COOLANT
EVAPORATOR
TEMPERATURE
TEMPERATURE
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AIRFLOW TEMPERATURE CONTROL OPERATION [FULL-AUTO AIR CONDITIONER]

Airflow Temperature Automatic Control

The A/C amplifier calculates the air mix actuator stop position (airflow temperature) by adding the correction
input from the ECT sensor and evaporator temperature sensor to the target temperature that was calculated
based on the set temperature and input from each sensor, operating the actuator.
The actuator stop position moves towards MAX
COLD as the input temperature (heater core
temperature) from the ECT sensor increases, and
it moves towards MAX HOT as the input
temperature from the evaporator temperature
sensor (evaporator temperature) decreases.
x set temperature) - (K
1 2
+ C
5
A/C AMPLIFIER
SIGNAL
ECT
SENSOR
x cabin temperature) - (K
3
AIR MIX ACTUATOR
OUTPUT
OPERATION
FEEDBACK
A/C AMPLIFIER
TARGET
TEMPERATURE
ECT SENSOR
AIR MIX
ACTUATOR
OPENING ANGLE
CALCULATION
EVAPORATOR
TEMPERATURE
SENSOR
id0740a1105700
x ambient temperature) - (K
id0740a1102100
id0740a1102200
AIR MIX DOOR
AIRFLOW
TEMPERATURE
CHANGE
ar8uun00000323
id0740a1102300
AIR MIX ACTUATOR
ar8uun00000324
07-40–9
x
4
07-40