Sensor fault detection using paired sample correlation

A battery system comprising:

• a battery operably connected to provide power to at least one load;
• a voltage sensor configured to measure a battery voltage of the battery;
• a current sensor configured to measure a battery current of the battery;
• and
• a controller operably connected to the voltage sensor and the current sensor, the controller being configured to:
• receive a sequence of battery voltage samples from the voltage sensor and a sequence of battery current samples from the current sensor;
• determine a change in the battery voltage samples over a predetermined number of samples and a change in the battery current samples over the predetermined number of samples;
• check whether a ratio of the change in the battery voltage samples and the change in the battery current samples is within an expected range for one of (i) a resistance of the battery and (ii) a conductance of the battery;
• and
• detect the fault in the current sensor based on whether the ratio is within the expected range.