Event Counter Using Adaptive Rate-of-Rotation Sensor Verification
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Solution Overview
Problem
Existing event counters, particularly those using acceleration signals, face challenges in accurately detecting step events during intense directional changes or vibrations, leading to faulty detections.
Innovation Solution
A method that utilizes a second sensor, such as a rate-of-rotation sensor, temporarily and adaptively to verify counting events, especially when the primary acceleration sensor's signal is ambiguous, employing criteria like mean value, standard deviation, and high-to-low ratio for plausibility checks, and connecting the secondary sensor only when a counting event is likely to minimize energy consumption and maximize detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single acceleration sensor is used for event detection, then the device complexity is low, but the measurement precision deteriorates under intense directional changes or vibrations
Solution Approach 1:
The patent combines signals from multiple sensors (acceleration sensor and rate-of-rotation sensor) to detect counting events. The evaluation unit integrates data from both sensors to determine whether a counting event has occurred, leveraging the complementary strengths of each sensor modality to achieve reliable detection under various motion conditions.
Solution Approach 2:
The second sensor (rate-of-rotation sensor) serves multiple functions: it provides alternative detection capability when the first sensor is unreliable, enables periodic verification of counting events, and allows for adaptive connection based on signal properties. This multi-functional approach resolves the contradiction by providing enhanced measurement precision without permanently increasing device complexity.
2Measurement precision
If the second sensor is connected permanently, then the measurement precision is high, but the use of energy increases
Solution Approach 1:
The patent implements periodic connection of the second sensor at predetermined time intervals. The evaluation unit determines whether to connect the second sensor based on whether a counting event is currently detected by the first sensor. This periodic verification approach maintains high measurement precision while significantly reducing energy consumption compared to permanent connection.
Solution Approach 2:
The connection state of the second sensor is dynamically adjusted based on the detection status of the first sensor. When the first sensor detects a counting event, the second sensor is connected for verification; when no event is detected, the second sensor remains disconnected. This dynamic adaptation resolves the energy-precision contradiction by activating the energy-intensive sensor only when necessary.
3Reliability
If the second sensor is connected frequently, then the reliability of event verification is high, but the loss of time increases due to frequent sensor switching
Solution Approach 1:
The patent establishes predetermined time intervals for periodic connection of the second sensor. This regular scheduling ensures that verification occurs at optimal moments without excessive frequency, balancing reliability improvement against time loss from sensor switching. The periodic approach prevents both overly frequent switching and insufficient verification.
Solution Approach 2:
The system prepares for verification by monitoring the first sensor's output continuously and readying the second sensor for connection when a counting event is detected. This preliminary preparation minimizes the actual switching time and ensures that verification can begin immediately when needed, reducing the overall time loss while maintaining high reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly enhances the detection accuracy of step events while minimizing false positives and reducing electrical energy consumption by ensuring that only genuine events are counted, thereby optimizing the performance of the event counter.
Implementation Method 1
Ascertaining at least one counting event with the aid of a signal from a first sensor; the first sensor is an acceleration sensor
Implementation Method 2
the second sensor is a rate-of-rotation sensor
Data Source
AI summary
A method for operating an event counter, including the following: ascertaining at least one counting event with the aid of a signal from a first sensor; and using a signal from a second sensor for ascertaining the counting event if the signal from the first sensor is unable to be unequivocally allocated to a counting event.