Image forming apparatus, fixing temperature determination method, and non-transitory computer readable medium

An image forming apparatus comprising:

• a temperature sensor configured to detect a temperature of an inside of the image forming apparatus;
• a reader configured to read production date information from a recording medium of a first toner cartridge received by the image forming apparatus;
• a memory configured to store temperature history information regarding a history of the temperature of the inside of the image forming apparatus detected by the temperature sensor;
• a fixing device configured to fix a toner image onto a paper sheet by heating the paper sheet to a fixing temperature, wherein the toner image is transferred to the paper sheet using a first toner stored in the first toner cartridge;
• and
• a controller configured to:
• determine a first temperature correction value based on the temperature history information stored in the memory;
• determine a second temperature correction value based on a number of days elapsed from a production date of the first toner in the first toner cartridge, which is calculated based on the production date information read by the reader;
• determine the fixing temperature based on a higher value of the first temperature correction value and the second temperature correction value;
• and
• control the fixing temperature at the fixing device;
• wherein, after heating the paper sheet with the fixing device, the controller is configured to:
• determine whether the temperature history information stored in the memory needs to be updated based on the temperature of the inside of the image forming apparatus detected by the temperature sensor in response to fixing the toner image to the paper sheet and the temperature history information stored in the memory;
• and
• update the temperature history information stored in the memory with the temperature of the inside of the image forming apparatus detected by the temperature sensor in response to fixing the toner image to the paper sheet when the temperature history information stored in the memory needs to be updated.