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NOx sensors | Nitrogen oxide sensors | Function and use

The NOx sensor works according to a similar principle as the wideband lambda sensor and, similar to it, requires sensor heating which brings the sensor up to operating temperature (approx. 700°C). The NOx sensor consists of two chambers arranged one after theother: The amount of residual oxygen in the exhaust gas is determined in the first chamber. This can be achieved by applying a voltage which “pumps” the oxygen out of the cell. Depending on the vehicle type and position of the sensor, the NOx sensor may therefore take on the function of a lambda sensor and replace it. NOx is broken down into its constituent parts, nitrogen and oxygen, in the second chamber. The amount of oxygen that results as part of this process is measured by an additional pump electrode. The “pump current” expended for this is proportional to the NOx concentration in the exhaust gas. It is evaluated by the control unit at the NOx sensor and reported to the engine control unit via CAN bus.