Piezoelectric Sensor Reference Voltage Averaging

The patent applies preliminary action by pre-calculating and storing the average output voltage values during a calibration period before normal operation begins. This allows the system to have the reference voltage ready in advance, eliminating the need for stabilization delays during actual operation. The calculation unit computes the reference voltage from calibration data obtained beforehand, so when an operation is detected, the comparison can occur immediately without waiting for waveform stabilization.

The patent implements self-service by enabling the calculation unit to automatically compute and update the reference voltage based on the sensor's own output data. The system performs self-calibration by averaging the output voltages during a calibration period and using this self-generated reference for subsequent operation detection. This eliminates the need for external calibration equipment or complex periodic resetting mechanisms, as the sensor system calibrates itself using its own characteristics.

The patent applies parameter changes by transforming the reference voltage from a fixed value to a dynamically calculated average of multiple sensor output samples. Instead of relying on a single stable waveform point, the system changes the reference determination method to use statistical averaging, which inherently filters out waveform instability and noise. This parameter transformation allows accurate operation detection even when the sensor output waveform fluctuates, as the averaged reference voltage represents the true baseline more reliably.