System and methods for assessing the interior of an autonomous vehicle

A system for a vehicle comprising:

• a plurality of sensors each sensing a different property of an interior of the vehicle, the plurality of sensors including all of a visible light camera, an infrared (IR) camera, and an electrochemical sensor;
• a controller coupled to the plurality of interior sensors and programmed to—
• receive a first output for each sensor of the plurality of sensors;
• receive a second output for each sensor of the plurality of sensors after receiving the first output for each sensor of the plurality of sensors;
• for each sensor of the plurality of sensors—
• calculate a change value that is a change between the first output and the second output for the each sensor;
• and
• when the change value meets a threshold condition corresponding to the each sensor, invoke cleaning of the interior;
• calculate an aggregate change as one of a sum and a weighted sum of the change values for the plurality of sensors;
• compare the aggregate change to an aggregate threshold condition;
• and
• when the aggregate change between the first outputs and the second outputs exceeds the aggregate threshold condition and the change value for each of the sensors of the plurality of sensors does not meet the threshold corresponding to the each sensor, invoke cleaning of the interior.