CONSTRUCTION
The planar type air fuel ratio sensor is used.
The planar type air fuel ratio sensor uses alumina, which excels in heat conductivity and insulation, to integrate the sensor element with the heater, thus improving the warm-up performance of the sensor.
This sensor is based on a sensor developed for gasoline engines. The cover has been changed for diesel engine application in order to eliminate the influences of the sensor temperature and the PM. This sensor, which is mounted after the DPF catalyst, detects the air fuel ratio after the gas has been reduced.
| *1 | Platinum Electrode | *2 | Heater |
| *3 | Alumina | *4 | Atmosphere |
| *5 | Sensor Element (Zirconia) | *6 | Diffusion Resistance Layer |
The air fuel ratio sensor data is approximately proportionate to the existing air fuel ratio. The air fuel ratio sensor converts the oxygen density to the electric current and sends it to the ECM.
As a result, the detection precision of the air fuel ratio has been improved. The air fuel ratio sensor data can be read using a Global TechStream (GTS).