6 Air Conditioning ECU The following table is a comparison of the air

6 air conditioning ecu the following table is a

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6. Air Conditioning ECU The following table is a comparison of the air conditioning ECU functions between the new and previous model. System Function New Previous Calculation of Required Outlet Air Temperature Calculates the required outlet air temperature based on the set temperature, room air temperature, ambient air temperature and solar radiation. Temperature Control To drive the air mix servomotor in accordance with the required outlet air temperature, the air temperature passed through the evaporator and the engine coolant temperature and to control the outlet air temperature (Air Mix Damper Control). Sets the blower speed according to operation of the blower switch (Manual Control). (5-step) (5-step) Blower Control When the automatic control or front defroster switch is turned on, the blower starts. Then the blower speed that is appropriate for the required outlet air temperature is compared with the blower speed that is appropriate for solar radiation, and the blower is controlled with the faster speed of the above two speeds (Automatic Control). However, when the coolant temperature is below a predetermined level and the air outlet is in the “foot” or “bi-level” mode, the blower will not operate (Warm-Up Control).
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100 BODY ELECTRICAL — AIR CONDITIONING System Function New Previous Blower Control When the air outlet mode is at “face” or “bi-level” and the required outlet air temperature is below a predetermined level, the blower is set to operate after a time lag in order to prevent hot air from being blown out suddenly right after the engine is started (Time-Lagged Air Flow Control). Drives the air inlet servomotor according to the operation of the air inlet control switch and fixes the dampers in the “fresh” or “recirc.” position (Manual Control). Air inlet Control Switches the damper position between “fresh”, “fresh and recirc. mix” or “recirc.” according to the required outlet air temperature (Automatic Control). Fixes the damper position on “fresh” if the front defroster switch is turned on during automatic control (Forced Fresh Air Intake Control). Drives the air outlet step motor in accordance with the operation of the mode select and front defroster switches and fixes the dampers in the “face”, “bi-level”, “foot”, “foot and def.” or “def.” position (Manual Control). Air Outlet Control Switches the damper position between “face”, “bi-level” of “foot” according to the required outlet air temperature (Automatic Control) If the blower is under warm-up control when the air outlet mode is in “bi-level” or “foot” mode, the LCD display remains as it is while the air outlet step motor is driven and the dampers are switched to the “def.” position, preventing cool air from leaking from the foot vent (Def.-Foot Control).
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101 BODY ELECTRICAL — AIR CONDITIONING System Function New Previous If the A/C switch is switched on while the blower is turned on, this turns on the magnetic clutch relay and operates the compressor (Manual Control).
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