Air Fuel Ratio (A/F) Sensor 1: Description

Fig 1: Accelerator Pedal Position Sensor Output Voltage Graph

Courtesy of NISSAN NORTH AMERICA, INC.

The sensor element of the A/F sensor 1 is composed an electrode layer, which transports ions. It has a heater in the element.

The sensor is capable of precise measurement λ = 1, but also in the lean and rich range. Together with its control electronics, the sensor outputs a clear, continuous signal throughout a wide λ range.

The exhaust gas components diffuse through the diffusion layer at the sensor cell. An electrode layer is applied voltage, and this current relative oxygen density in lean. Also this current relative hydrocarbon density in rich.

Fig 2: Identifying Protector, Holder And Zirconia Element

Courtesy of NISSAN NORTH AMERICA, INC.

Therefore, the A/F sensor 1 is able to indicate air fuel ratio by this electrode layer of current. In addition, a heater is integrated in the sensor to ensure the required operating temperature of approximately 760°C (1, 400°F).

Fig 3: Air Fuel Ratio Sensor Voltage Graph

Courtesy of NISSAN NORTH AMERICA, INC.