ACTIVE AIR SHUTTER CONTROL

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Outline

• With the active air shutter control, the active air shutter actuator controls the shutter open/close based on the open/close signal from the PCM.

• The controlled functions are as follows.

Control table

Control	Function	Content
Basic Control	Basic function (See Basic function .)	• Opens/closes the shutter according to the vehicle speed, coolant temperature, or the load condition due to the A/C operation.
Basic Control	Shutter fully open/closed position learning function (See Shutter fully open/closed position learning function.)	• Learns the shutter fully open/closed positions by opening/closing the shutter.
Protection Control	Motor protection function (See Motor protection control.)	• Opens the shutter to protect the motor if the PCM determines that the coolant temperature is high.

Block Diagram

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Operation

• The shutter fully opens when the main power is switched OFF.

• The shutter is controlled between 0° (fully-closed position) and 90° (fully open position).

Note

• With the shutter opened to the intermediate opening position, more air flows to the radiator and condenser while driving than with the shutter at the fully closed position.

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• The PCM opens/closes the active air shutter depending on the conditions after the shutter fully open/closed position learning is completed.

• The PCM opens/closes the shutter in the following control sections.

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Basic Control

Basic function

• The PCM opens the shutter from 0° (fully open) to 3° (intermediate opening angle) when all of the following conditions are met.

― Vehicle speed: Less than160 km/h {99.4 mph}

― Motor coolant temperature: Less than 55 °C {131 °F}

― Load condition due to A/C operation: Vehicle speed during A/C operation and refrigerant pressure are the specified values or less

― Protection control is not operating

• If any of the following conditions is met, the PCM opens the shutter to 90° (fully open position).

― Vehicle speed: 160 km/h {99.4 mph} or more

― Motor coolant temperature: 59 °C {138 °F} or more

― Refrigerant pressure: 1.4 MPa {14 kgf/cm², 203 psi} or more

― A/C operation is in the following range (for condenser cooling)

• During cooling control

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• During heating control

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Shutter fully open/closed position learning function

Note

• After the main relay turns off (specified time has elapsed since main power is switched OFF), the PCM commands a write of the shutter fully open/closed position learning value recorded in the active air shutter actuator to the non-volatile memory in the actuator.

Shutter fully open/closed position learning function flow

1. When the main power is switched ON (READY on), and there is a position learning request from the actuator, the PCM outputs a position learning command to the actuator.

2. The actuator itself moves the shutter to 90° (fully open position) or 0° (fully closed position).

3. After the shutter reaches 0° (fully closed position), the PCM turns off the position learning command and the actuator itself moves the shutter to 90° (fully open position).

4. When the shutter reaches 90° (fully open position), the shutter fully open/closed position learning function is completed and the position learning request from the actuator turns off.

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• If an error occurs during the shutter fully open/closed position learning and the learning is not completed, the PCM performs the learning request again (to maximum 3 times).

Protection Control

Motor protection control

• If any of the following conditions is met, the PCM opens the shutter to 90° (fully open position) to protect the motor until the main power is switched OFF.

― Motor temperature: 140 °C {284 °F} or more

― Inverter temperature: 96 °C {204 °F} or more