System Operation

The intake door control judges intake door position based on the ambient atmospheric CO, NO2 and unpleasant odor, ambient temperature, the intake air temperature and the in-vehicle temperature. When DEF or OFF switch is pressed, the unified meter and A/C amp. sets the intake door at the FRE position.

Door Motor Circuit

Fig 1: Door Motor Circuit Diagram

Courtesy of NISSAN NORTH AMERICA, INC.

Intake Door Control Specification

• Intake door position is basically fixed at FRE when FRE indicator of intake switch is OFF or DEF switch is ON.
• Intake door position is basically fixed at REC when REC indicator of intake switch is ON.
• Intake door automatic control selects FRE, 20 - 80%FRE, or REC depending on a target air mix door opening angle, based on in-vehicle temperature, ambient temperature, and sunload.

Fig 2: Intake Door Control Air Circulation Graph

Courtesy of NISSAN NORTH AMERICA, INC.

Automatic intake control (exhaust gas/outside odor detecting mechanism)

Description

• In addition to air inlet automatic control of automatic air conditioning system, unified meter and A/C amp. controls automatically air inlet according to signal from exhaust gas/outside odor detecting sensor, so that unpleasant outside odor does not enter in passenger room.

Operation Description

• When AUTO switch is pressed, AUTO intake indicator and REC indicator turn ON. Air inlet is fixed to recirculation for approximately 5 minutes, and then is switched to automatic intake control (exhaust gas/outside odor detecting mechanism).
• Air inlet switches to recirculation when exhaust gas or outside odor is detected while automatic intake control (exhaust gas/outside odor detecting mechanism) is operated. After that, air inlet switches to fresh air intake when exhaust gas or outside odor becomes not detectable.