Oxygen sensor: Notes

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The oxygen sensor is a broadband oxygen sensor (universal oxygen sensor 4.9). The broadband oxygen sensor continuously measures the residual oxygen in the exhaust gas. The fluctuating values of the residual oxygen are forwarded to the DDE control unit as a voltage signal.

This oxygen sensor is used in diesel engines as a control sensor and a monitoring sensor.

A Lambda oxygen sensor is necessary for compliance with exhaust-gas limit values. The oxygen sensor is required for the quantity mean value adaptation of the injectors. The Lambda oxygen sensor measures the fuel - air ratio. In the event of deviations, the DDE adapts the exhaust-gas recirculation rate to suit the change in air/fuel ratio. The mean quantity adaptation is not a rapid control operation, but is instead an adaptive learning procedure. An oxygen sensor deviation is "learned" in a characteristic map and stored for a sustained period in the DDE control unit (EEPROM).