Air Flow Control

AUTOMATIC AIR CONDITIONING SYSTEM (WITH FOREST AIR) : Air Flow Control


DESCRIPTION
- A/C auto amp. changes gate voltage to power transistor and controls air flow in 31 stages based on target air flow. When air flow is to be increased, gate voltage to power transistor increases gradually for preventing excessive large amount of air flow.
- In addition to manual control and automatic control, air flow control is consist of low coolant temperature starting control, fan speed control at door motor operation and fan speed control at voice recognition.

AUTOMATIC AIR FLOW CONTROL
- A/C auto amp. decides target air flow depending on target air mix door opening angle.
- A/C auto amp. changes voltage to power transistor gate and controls air flow in 31 stages, so that target air flow is achieved.





- When air outlet is VENT or B/L, the minimum air flow is changed depending on sunload.

LOW COOLANT TEMPERATURE STARTING CONTROL
A/C auto amp. does not operate bower motor when engine coolant temperature is approximately 37�C (99�F) or less, for preventing a cold discharged air flow. After this, gate voltage applied to power transistor gradually, and blower motor operates.

FAN SPEED CONTROL AT DOOR MOTOR OPERATION
When mode door motor is activated while air flow is more than the specified value, A/C auto amp. reduces temporarily fan speed so that mode door moves smoothly.

FAN SPEED CONTROL AT VOICE RECOGNITION
When the voice control (voice command) switch is operated during air flow automatic control, A/C auto amp. decreases the air flow of the blower motor once and controls the air flow so as not to disturb the voice recognition function. This control continues while voice recognition function is operating.