Capacitive Sliding Door Gesture Detection With Adaptive Thresholds
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Solution Overview
Problem
Existing vehicle operation detection devices have limitations in accurately detecting user operations due to incorrect determination of capacitance changes, leading to incorrect signaling for opening and closing sliding doors.
Innovation Solution
The device employs sensor electrodes arranged in a row with distinct directions for opening and closing, using a processing circuitry to determine the operation start electrode and adjacent electrode capacitance changes, setting different determination values based on the initial capacitance levels to accurately differentiate between opening and closing operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single determination value is used for all sensor electrodes, then the device complexity is reduced, but the measurement precision of capacitance changes deteriorates
Solution Approach 1:
The patent applies local quality by setting different determination values for different sensor electrodes based on their individual capacitance characteristics. Specifically, the first determination value is set for the first sensor electrode and the second determination value is set for the second sensor electrode, allowing each electrode to be optimized for its local detection conditions rather than using a uniform threshold across all electrodes.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the determination values based on the initial capacitance levels of the sensor electrodes. When the initial capacitance of the first sensor electrode is higher than that of the second sensor electrode, the first determination value is set higher than the second determination value, and vice versa. This adaptive parameter adjustment optimizes the detection sensitivity for each electrode's specific operating conditions.
2Reliability
If the determination value is set high to avoid false detection, then the reliability improves, but the productivity of operation detection deteriorates
Solution Approach 1:
The patent resolves this contradiction by dynamically adjusting the determination values based on initial capacitance measurements. By setting appropriate thresholds (first and second determination values) according to the actual capacitance levels of each sensor electrode, the system achieves both high reliability in distinguishing true operations from false signals and high productivity in detecting user actions without unnecessary delays.
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 enhances the accuracy of detecting user operations by correctly identifying capacitance changes, ensuring precise signaling for opening and closing the vehicle door, thereby improving user operation detection.
Implementation Method 1
In each of the sensor electrodes, the capacitance changes in correspondence with the distance from a detection target
Data Source
AI summary
A vehicle operation detection device includes processing circuitry configured to output a command causing an opening-closing body of a vehicle to open and close in reference to capacitances of sensor electrodes arranged so as to form a row. The processing circuitry is configured to determine that a first operation has been performed when one of the sensor electrodes of which the capacitance increases is sequentially shifted in a first direction from an operation start electrode and determine that a second operation has been performed when the shifting is performed in a second direction. The sensor electrodes include an adjacent electrode adjacent to the operation start electrode. The processing circuitry is configured to determine that the capacitance of the adjacent electrode has increased when the capacitance becomes greater than or equal to a second determination value that is greater than a first determination value.