Fan Vibration-Based Cooling Control for Electronic Apparatus

The patent segments the total vibration signal into two distinct components: background vibration (measured when fan is off) and fan-induced vibration (measured when fan is on). By separating these vibration sources temporally and comparing their differences, the system achieves precise identification of fan vibration without requiring complex analysis of the combined signal, thus resolving the contradiction between simple control and accurate measurement.

The patent performs preliminary measurement of background vibration when the fan is not operating, before the fan starts. This preliminary action establishes a baseline that is stored and later subtracted from the total vibration measurement when the fan is running, enabling accurate isolation of fan-induced vibration components and preventing false abnormality detection.

The patent makes the existing vibration sensor serve multiple functions: it detects both background vibration (when fan is off) and total vibration (when fan is on). By temporally separating these measurement modes and using differential calculation, a single sensor achieves the precision that would traditionally require multiple dedicated sensors, thus eliminating additional cost and complexity while maintaining high measurement accuracy.

The system uses its own existing vibration sensor to detect and measure fan-induced vibrations through differential measurement, rather than requiring an external dedicated fan vibration sensor. The sensor effectively serves itself by switching between background measurement and total vibration measurement modes, eliminating the need for additional hardware components.