Dynamic Filter Selection for Flow-Volume Measurement Accuracy

The patent implements dynamic filter selection by switching between different filter types (first filter for pulsation removal, second filter for general noise removal) based on real-time flow-volume state detection. The filter selecting unit dynamically adjusts the filtering characteristics according to whether the fluid is in a pulsating state or a non-pulsating state, ensuring optimal measurement accuracy across varying operating conditions.

The patent changes the filtering parameters by selecting different filter configurations based on the detected flow-volume state. When pulsation is detected, a filter with pulsation removal characteristics is selected; when no pulsation is present, a filter with general noise removal characteristics is selected. This parameter adaptation resolves the contradiction between fixed filter limitations and varying operational requirements.

The patent segments the filtering function into distinct filter units, each optimized for specific flow-volume states. Instead of using a single complex filter that attempts to handle all conditions, the system divides the filtering task into multiple specialized filters (first filter for pulsation, second filter for general noise), with a selecting unit that activates only the appropriate filter for the current state, thereby managing complexity through functional segmentation.

The patent performs preliminary detection of the flow-volume state before applying the appropriate filter. The flow-volume state determining unit assesses the current operating condition in advance, and based on this preliminary assessment, the filter selecting unit pre-selects the most suitable filter configuration. This preliminary action prevents the need for complex real-time adaptive filtering while maintaining measurement accuracy.