Method for determining a freshness state of a food in a storage container as well as computer program product and storage container

A method, for determining a freshness state of a food in a storage container, the method comprising:

• performing a first freshness state determination cycle of the food by,
• setting a first operating temperature of at least one MOX sensor, and capturing a gas mixture in the storage container by the MOX sensor at the first operating temperature;
• setting at least one second operating temperature of the MOX sensor that is different from the first operating temperature, and capturing a gas mixture in the storage container by the MOX sensor at the second operating temperature;
• determining, by an evaluation unit, a state of the gas mixture based on the information captured at the at least two operating temperatures during the first freshness state determination cycle;
• performing a second freshness state determination cycle of the food temporally consecutively to the first freshness state determination cycle, in the second freshness state determination cycle,
• setting the first operating temperature of the MOX sensor, and capturing a gas mixture in the storage container by the MOX sensor at this first operating temperature;
• setting at least the second operating temperature of the MOX sensor that is different from the first operating temperature, and capturing a gas mixture in the storage container by the MOX sensor at the second operating temperature;
• determining, by the evaluation unit, a state of the gas mixture based on the information captured at the two operating temperatures during the second freshness state determination cycle;
• determining, by the evaluation unit, the freshness state of the food in the storage container based on the state of the gas mixture that was determined in the first freshness state determination cycle and based on the state of the gas mixture which was determined in the at least second freshness state determination cycle;
• the step of determining the freshness state of the food in the storage container further including the steps of:
• analyzing captured information of the MOX sensor as actual signal sequences, and
• comparing the actual signal sequences with reference signal sequences;
• and
• the reference signal sequences being machine trained in a preprocessing phase of the method using machine learning, the machine training using the determined freshness state to update at least one of the reference signal sequences and/or a freshness state class maintained by the system.