Electrochemical sensor measurement unit

A method of predicting the remaining lifetime of an electrochemical sensor, the method comprising:

• applying a set of stimulus signals to a sensor input of the electrochemical sensor;
• receiving a set of electrochemical sensor signals via a sensor output of the electrochemical sensor;
• determining set of sensor parameters at a corresponding set of time values from the electrochemical sensor signals;
• determining a predicted lifetime value corresponding to an expected remaining lifetime of the electrochemical sensor by comparing a sensor degradation signature to a sensor degradation reference signature;
• wherein the sensor degradation reference signature includes a set of reference sensor parameters that were generated at an earlier time by applying the set of stimulus signals to the electrochemical sensor.

An electrochemical sensor measurement unit comprising:

• a sensor degradation signature unit;
• a processing unit coupled to the sensor degradation signature unit and further comprising:
• a processor first input configured to be coupled to a sensor output of an electrochemical sensor;
• a processor first output configured to be coupled to a sensor input of an electrochemical sensor;
• and wherein the processing unit is configured to:
• apply a stimulus signal to the sensor input;
• receive an electrochemical sensor signal via the sensor output;
• determine at least one sensor parameter at one or more time values from the electrochemical sensor signal;
• determine a predicted lifetime value corresponding to an expected remaining lifetime of the electrochemical sensor dependent on a sensor degradation signature, and the at least one sensor parameter;
• a sensor parameter extraction module having a sensor parameter extraction output coupled to the processor first input,
• wherein the sensor parameter extraction module is configured to:
• receive the electrochemical sensor signal;
• extract at least one sensor parameter from the electrochemical sensor signal;
• and provide the at least one sensor parameter to the processing unit;
• and
• a sensor fusion module configured to be coupled between a plurality of electrochemical sensors and the sensor parameter extraction module and configured to:
• receive the electrochemical sensor signal from a first electrochemical sensor of the plurality of electrochemical sensors;
• receive at least one further electrochemical sensor signal from a further electrochemical sensor of the plurality of electrochemical sensors;
• and
• provide the electrochemical sensor signal and the at least one further electrochemical sensor signal to the sensor parameter extraction module;
• and
• wherein the sensor degradation signature comprises at least one sensor degradation signature for each of the plurality of electrochemical sensors.