Vehicle Seat Load Sensor Collision Impact Filtering
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Solution Overview
Problem
Existing passenger weight measuring devices and vehicle impact determination systems are prone to inaccurate weight detection and false alerts due to minor collisions during parallel parking, leading to unnecessary vehicle check-ups.
Innovation Solution
A seat apparatus for vehicles featuring a load detection system with front and rear load sensors and a detection influence determination device that distinguishes between minor and significant collisions by using preset collision load values and offset calculations, preventing alerts for minor impacts that do not affect passenger determination performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the load sensor uses a strain body with high intensity to measure passenger weight sensitively, then measurement precision is improved, but the strain body may be abnormally deformed by large impact loads during vehicle collision, causing detection errors
Solution Approach 1:
The control device preliminarily determines whether an abnormal load is applied to the seat before using the load sensor measurement for airbag control. By checking if the measured load exceeds a predetermined threshold value, the system prevents abnormal collision loads from affecting the load sensor, thereby protecting measurement precision while maintaining reliability under collision conditions
Solution Approach 2:
The control device acts as an intermediary between the load sensor and the airbag control system. It processes the raw load sensor output by comparing it against a threshold value, filtering out abnormal collision impacts before they can cause detection errors, thus protecting the measurement system while maintaining accurate passenger weight detection
2Reliability
If the vehicle impact determination device detects compression and tensile loads to determine vehicle collision, then collision detection capability is improved, but minor collisions during parallel parking are falsely identified as significant impacts, causing unnecessary alerts and check-ups
Solution Approach 1:
The system changes the parameter threshold for triggering collision alerts. By setting the alert threshold at a higher predetermined value, the system distinguishes between minor collisions (such as those during parallel parking) and significant impacts, preventing false alerts while maintaining reliable collision detection capability
Solution Approach 2:
The system applies a more stringent criterion (higher threshold value) for triggering collision alerts than would be needed for basic collision detection. This excessive action filters out minor impacts that would otherwise trigger false positives, improving impact severity classification accuracy while preserving detection of significant collisions
3Measurement precision
If the load detection device detects loads at four corner positions of the seat frame, then comprehensive weight measurement is achieved, but the complexity of the detection system increases, requiring multiple sensors and complex signal processing
Solution Approach 1:
The patent merges the load detection functions at all four corner positions into a single comprehensive weight measurement value. By summing the loads detected at each corner, the system achieves comprehensive passenger weight measurement while simplifying the output to a single value that can be directly used for airbag control, reducing the complexity of signal processing
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 solution ensures accurate passenger weight detection and reduces false alerts, minimizing unnecessary vehicle check-ups by differentiating between minor and significant collisions based on collision load values and offset calculations.
Implementation Method 1
the load sensor is configured with a strain gauge affixed to a strain body which bends when the load is applied, and outputs voltage signals which change in response to a changing amount of a resistance value associated with flexural deformation of the strain body
Data Source
AI summary
A seat apparatus for a vehicle includes a load detection device placed at a front and a rear of one of a right-left pair of the attachment members so as to be spaced apart from each other, the load detection device measuring a load applied to a seat to distinguish an existence of a passenger and a type of a passenger, a detection influence determination device determining an existence of an influence on a passenger determination performance of the load detection device in a case where a collision load value detected by the load detection device in the case of a collision of the vehicle corresponds to a detected value between a preset first collision load value and a preset second collision load value, and a collision influence alert device outputting an alert in a case where the detection influence determination device determines that the passenger determination performance is influenced.