On-board Warning Apparatus Differentiating Driver Inattentiveness and Dozing
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Solution Overview
Problem
Existing on-board warning systems fail to issue timely warnings for driver inattentiveness and dozing off, as they do not account for the distinct characteristics of these states, leading to inappropriate warning timing and potential safety risks.
Innovation Solution
An on-board warning apparatus that includes a collision danger determining device, a warning output device, an inattentive time measuring device, and a dozing time measuring device, with adjustable threshold values to differentiate between inattentive and dozing states, ensuring warnings are issued at appropriate times based on the characteristics of each state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the same allowable time threshold is used for both inattentive state and dozing state, then the warning system is simple to operate, but the warning timing is not appropriate for the distinct characteristics of each state
Solution Approach 1:
The patent segments the driver state monitoring into two distinct detection modes: inattentive state detection and dozing state detection. Each mode has its own dedicated measuring means and threshold value, allowing differentiated warning timing strategies. This segmentation resolves the contradiction by enabling appropriate warning timing for each state type while maintaining clear operational rules for each detection path.
Solution Approach 2:
The patent applies local quality by assigning different threshold values (first allowable time for inattentive state, second allowable time for dozing state) to different detection scenarios. The inattentive state uses a shorter threshold for earlier warning, while the dozing state uses a longer threshold, optimizing warning timing according to the specific characteristics of each driver state.
2Reliability
If the warning timing is advanced for inattentive states, then driver safety is improved, but false warnings may increase due to normal attention fluctuations
Solution Approach 1:
The patent implements dynamic threshold adjustment based on the detected driver state. The system dynamically switches between a first allowable time threshold for inattentive states and a second allowable time threshold for dozing states. This dynamic adaptation allows the system to issue timely warnings for genuine inattentiveness while tolerating normal attention fluctuations through the state-specific threshold selection.
Solution Approach 2:
The system continuously monitors driver state and provides feedback to adjust warning timing. By measuring the duration of inattentive or dozing states and comparing against state-specific thresholds, the system receives feedback on actual driver condition, enabling it to issue warnings only when the duration exceeds the appropriate threshold, thereby reducing false warnings while maintaining safety.
3Object-affected harmful factors
If the allowable time threshold is set longer to reduce false warnings, then false warning rate decreases, but warning timing becomes delayed and less effective
Solution Approach 1:
The patent segments the warning system into two parallel detection paths with different threshold values. The inattentive state path uses a shorter first allowable time threshold for rapid warning, while the dozing state path uses a longer second allowable time threshold to filter out false warnings. This segmentation allows the system to optimize for speed when needed and for accuracy when needed, without compromise.
Solution Approach 2:
The patent changes the time threshold parameter based on the detected driver state. When inattentive state is detected, the system applies a shorter threshold parameter; when dozing state is detected, it applies a longer threshold parameter. This parameter adaptation resolves the contradiction by allowing short thresholds for safety-critical inattentiveness while using long thresholds for dozing detection where false warnings are more problematic.
Data Source
AI summary
An on-board warning apparatus of the invention includes an inattentive time measuring device that measures a duration of an inattentive state of a driver; a dozing time measuring device that measures a duration of a dozing state of the driver; a first warning output device that warns the driver when the measured inattentive time exceeds a first predetermined period of time Ta; and a second warning output device that warns the driver when the measured dozing time exceeds a second predetermined period of time Tb. The first predetermined time Ta is shorter than the second predetermined period of time Tb.