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Climate Control System Description - Overview
Climate Control
The climate control system transmits appropriate signals to each motor based on the information (sunlight, in-car temperature, outside air temperature) received from each sensor. See below for details.
The climate control unit optimizes these controls in order to maintain passenger comfort. Relationship Between Vent (air outlet) Temperature and Actual In-Car Temperature
The climate control unit can automatically control vent temperature (air mix position), blower motor speed, blower intake, and A/C compressor operation to raise or lower the vehicle's interior temperature to match the customer's setting temperature. The actual vent outlet temperature largely depends upon the difference between the in-car temperature sensor reading and the customer's setting temperature. Warm-Up Control
If heating is desired, and there is no available heat due to low engine coolant temperature, the climate control unit will slow the fan speed to avoid ventilating unpleasant air. The climate control unit will gradually increase the fan speed as the engine coolant temperature rises. The conditions that this control becomes effective are as follows:
Low Engine Coolant Temperature Control
When engine coolant temperature is low, the climate control system changes an air outlet position to the DEF. If engine coolant temperature gradually rises, the climate control system changes an air outlet position to the HEAT/DEF. When the engine coolant temperature increases, the climate control system controls the air outlet position and outlet air temperature automatically. Relationship Between Vehicle Speed and Blower Intake Mode
Because air resistance is different, the air volume is different in the FRESH mode and the RECIRC mode if the fan speed is constant. When a recirculation control damper is "FRESH", fresh air increases as vehicle speed rises. The climate control unit regulates fan speed to make the air volume of the FRESH mode the same as RECIRC mode. A/C Control
To prevent the evaporator from freezing, the climate control unit switches the A/C compressor ON and OFF based on the evaporator temperature sensor value. While in the automatic operation mode, the climate control unit automatically varies the A/C compressor operation time based on the evaporator temperature sensor value, as well as an ambient temperature. MAX Control
When the temperature setting is adjusted to "MAX COOL (Lo)" or "MAX HOT (Hi)", the climate control unit overrides automatic control and defaults to the following operation:
ECON Control
When activated by the driver, the ECON mode switch input modifies climate control system operation to improve fuel-efficiency. Under certain conditions, using the ECON mode may create a customer perception of reduced A/C performance because fuel economy is given priority over cabin comfort. Operation of climate control outputs is modified to reduce the electrical and mechanical load as follows:
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