Driver Awakening Detection via Steering, Inclination, and Position Frequency
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Solution Overview
Problem
Conventional awakening degree determination apparatuses fail to accurately assess the awakening degree of drivers due to variations in drive patterns, particularly in drowsy states where pulsing corrected steering does not occur but long-period wobble or meandering happens, as they rely on frequency of minimal time before lane deviation, no change in steering angle, corrected steering, and lateral position thresholds.
Innovation Solution
An apparatus that calculates angle frequency, inclination frequency, and position frequency based on predetermined threshold values, determining a decrease in awakening degree when any of these frequencies exceed their respective thresholds, incorporating angle change, inclination change, and lateral position change amounts over specific periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If awakening degree is determined based on steering angle fluctuations and corrected steering frequency, then detection can be performed using conventional methods, but drive patterns with long-period wobble or meandering without pulsing corrected steering cannot be accurately detected
Solution Approach 1:
The patent transitions from one-dimensional steering angle analysis to three-dimensional analysis by incorporating vehicle body inclination (roll angle) and lateral position as additional dimensions. This multi-dimensional approach enables detection of meandering drive patterns that manifest primarily in lateral position and inclination rather than steering angle fluctuations.
Solution Approach 2:
The patent segments the driving behavior analysis into three independent components: steering angle variations, vehicle body inclination, and lateral position. By calculating frequencies separately for each component and combining them, the system can detect diverse drive patterns including meandering without pulsing corrected steering.
2Measurement precision
If multiple parameters (steering angle, inclination, position) are monitored to cover all drive patterns, then detection accuracy improves, but system complexity increases
Solution Approach 1:
The patent uses a universal frequency calculation approach that processes multiple parameters (steering angle, inclination, position) through the same frequency analysis methodology. This multi-functional frequency calculation unit handles different input types uniformly, reducing system complexity despite monitoring multiple parameters.
Solution Approach 2:
The patent merges the frequency calculations of steering angle, inclination, and lateral position into a single integrated awakening degree determination process. By combining these frequencies and comparing against a threshold, the system achieves comprehensive detection while maintaining a relatively simple overall structure.
Data Source
AI summary
An object is to provide a technique capable of accurately determining an awakening degree. An awakening degree determination apparatus includes a change amount acquisition unit, a frequency calculation unit, and an awakening degree determination unit. The change amount acquisition unit acquires an angle change amount, an inclination change amount, and a position change amount. The frequency calculation unit calculates an angle frequency, an inclination frequency, and a position frequency. When at least one of the angle frequency, the inclination frequency, and the position frequency exceeds a fourth threshold value, a fifth threshold value, and a sixth threshold value, the awakening degree determination unit determines that an awakening degree of a driver of the vehicle decreases.