ECO Mode Control

SYSTEM

ECO Mode Control


DESCRIPTION

- A/C auto amp. receives operation status of each switch (A/C operation signal), D-MODE setting status (ECO
mode signal), and "CLIMATE ECO" setting status (A/C ECO setting signal) from multi display unit via CAN
communication.
- A/C auto amp. operates air conditioning system in ECO mode, when D-MODE on multi display unit is set to
ECO mode while air conditioning system is in automatic control.
NOTE:
- For setting procedure of D-MODE, refer to , "INTEGRATED CONTROL SYSTEM : System
Description".
- Activation or deactivation of ECO mode can be changed using multi display unit setting function ("CLIMATE ECO"). For setting procedure, refer to "INTEGRATED CONTROL SYSTEM : System
Description".

CONTROL OUTLINE

During ECO mode operation, A/C auto amp. changes air flow and control characteristics of air inlet, within a range that may not spoil the comfort level, lowers operation ratio of compressor, and reduces the electrical load. This reduces engine load and improved fuel economy. Refer to the following items for details of each control.
Air Flow Control
- A/C auto amp. increases voltage to power transistor gate compared to ordinary operation and reduces voltage to blower motor. This reduces air flow.
- Since air flow is reduced, the amount of air that passes evaporator is reduced. Increase of evaporator temperature can be moderated. Evaporator temperature is easily shifted to temperature control range for low temperature protection control. Operation ratio of evaporator is reduced.
- Since air flow is reduced, the electrical load is reduced. Alternator power output can be moderated.
Air Inlet Control
- In the following conditions, A/C auto amp. controls air inlet and increases recirculation air mixing ratio compared to ordinary operation.
- Ambient temperature: 25�C (77�F) or more
- Temperature setting: Any temperature other than full cold [18�C (60�F)] or full hot [32�C (90�F)]
- Air outlet: In automatic control
- Air flow: In automatic control
- Air inlet: In automatic control or in fresh air intake mode by manual control
- A/C switch: ON
- By increasing recirculation air mixing ratio, cooled air in passenger room is circulated in larger amount than during ordinary operation. Air temperature blowing to evaporator is maintained at a low level. Evaporator temperature increase can be moderated. Evaporator temperature is easily shifted to temperature control range for low temperature protection control. Operation ratio of evaporator is reduced.