Fuser Temperature Sensing Correction Across Resistance Drift

The patent implements a feedback mechanism where the temperature detection element's resistance value is continuously monitored and compared against reference values stored in memory. When the resistance value deviates from expected ranges, the system automatically triggers calibration routines to update reference values, ensuring continuous accuracy despite resistance drift over time.

The system dynamically adjusts the resistance value parameters by performing calibration at predetermined temperatures (e.g., room temperature, heating temperature) and storing correction coefficients. These parameter changes allow the temperature detection element to maintain accuracy even as its base resistance value changes due to aging or environmental factors.

The temperature detection range is segmented into multiple calibration regions, each with its own reference resistance values and correction coefficients. The system performs calibration at multiple predetermined temperatures (e.g., room temperature, intermediate temperature, heating temperature) and selects the appropriate correction coefficient based on the current temperature region, ensuring accurate detection across the entire operating range.

The system performs preliminary calibration actions at multiple predetermined temperatures before actual operation. During calibration, the temperature detection element's resistance values are measured at various temperatures and stored as reference data. This preliminary action ensures that correction coefficients are available for all expected operating conditions, enabling accurate temperature detection throughout the full temperature range.