System Operation
The intake door control judges intake door position based on the ambient atmospheric CO and NO2, ambient temperature, the intake air temperature and the in-vehicle temperature. When DEF or OFF switches are pressed, the unified meter and A/C amp. sets the intake door at the FRE position.
Door Motor Circuit
Intake Door Control Specification
- Intake door position is basically fixed at FRE when REC 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.
Auto Intake Control System
In addition to the regular automatic control, intake door condition is controlled by gas sensor output signal when auto intake mode is selected. This system automatically controls the inlet to prevent a smell of exhaust gas from getting into vehicle by receiving signals from the gas sensor that detects ambient atmospheric CO and NO2.