Seat Pinch Detection Control Using Backrest-Angle Thresholds
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Solution Overview
Problem
Existing seat control devices struggle to accurately detect pinching between seats regardless of the tilt angle of the backrest, leading to either false negatives or false positives in pinching detection due to fixed threshold values.
Innovation Solution
A seat control device with a pinching detecting unit that adjusts its threshold value based on the tilt angle of the backrest, using a larger threshold for small tilt angles and a smaller threshold for large tilt angles to optimize pinching detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large threshold value is used for pinching detection, then pinching can be detected in cases where the tilt angle is small, but pinching cannot be detected in cases where the tilt angle is large
Solution Approach 1:
The threshold value is made dynamic by changing it according to the tilt angle of the backrest. When the tilt angle is small, a large threshold value is used; when the tilt angle is large, a small threshold value is used. This dynamic adjustment resolves the contradiction between detecting pinching at small tilt angles without false alarms at large tilt angles.
Solution Approach 2:
The detection parameter (threshold value) is changed based on the tilt angle parameter. By adjusting the threshold value according to the tilt angle, the system adapts to different operational conditions, maintaining reliable pinching detection across the full range of tilt angles.
2Measurement precision
If a small threshold value is used for pinching detection, then pinching can be detected in cases where the tilt angle is large, but false detection occurs in cases where the tilt angle is small
Solution Approach 1:
The threshold value dynamically adapts to the tilt angle condition. At large tilt angles where pinching loads are small, a small threshold value enables sensitive detection. At small tilt angles where pinching loads are large, a large threshold value prevents false detections, thus resolving the contradiction between sensitivity and reliability.
Solution Approach 2:
The detection threshold parameter is adjusted based on the tilt angle parameter to match the expected pinching load characteristics. This parameter change strategy ensures that the detection system maintains both sensitivity and reliability across different operational conditions.
3Device complexity
If a fixed threshold value is used for pinching detection, then the device complexity is low, but the pinching detection accuracy varies with tilt angle
Solution Approach 1:
The control system uses a dynamic threshold value that changes with tilt angle, improving pinching detection accuracy without significantly increasing device complexity. The threshold adjustment is based on pre-established relationships between tilt angle and pinching load, requiring minimal additional computational resources.
Solution Approach 2:
The system changes the detection threshold parameter according to the tilt angle parameter, enabling accurate pinching detection across all tilt angles. This parameter adaptation approach maintains reliability while keeping the control logic relatively simple.
Data Source
AI summary
A seat control device controls an electric seat in which a seat portion is moved by a predetermined distance by a first motor and a backrest is tilted by a predetermined angle by a second motor. The seat control device includes: a pinching detecting unit that detects an object being pinched between seats due to a movement of the seat portion based on a rotational state of the first motor and a predetermined threshold value. The threshold value is a threshold value that changes according to a tilt angle of the backrest such that pinching is easily detected as the tilt angle of the backrest increases.