Driver State Recognition via Steering Angle Speed and Lane Deviation
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Solution Overview
Problem
Existing driver state recognition systems rely on predefined limit values and fail to accurately differentiate between inattentiveness due to fatigue, alcohol, or drug influence, and do not effectively monitor the course of steering angle speed and lane behavior for timely intervention.
Innovation Solution
The method involves monitoring the course of steering angle speed and frequency of steering corrections, combined with lane behavior analysis, to determine driver inattentiveness by evaluating the steering angle and lateral distance from lane markings, identifying patterns such as sudden steering interventions and frequent lane deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If predefined limit values are used for driver state recognition, then the system is simple to implement, but the accuracy of differentiating between fatigue, alcohol, and drug influence is insufficient
Solution Approach 1:
The patent segments the driver state recognition into multiple independent monitoring dimensions: steering angle monitoring, steering angular speed monitoring, lane keeping behavior monitoring, and frequency of steering corrections. Each dimension is evaluated separately and then integrated to determine overall driver state, allowing high accuracy without requiring a single complex system
Solution Approach 2:
The patent adds the dimension of steering angular speed monitoring to the traditional steering angle monitoring. By evaluating both the angle and its rate of change, the system gains additional information about driver alertness levels, enabling better differentiation between various states of inattentiveness
2Reliability
If steering angle and lane behavior are monitored continuously, then driver inattentiveness can be detected timely, but the computational load and system complexity increase
Solution Approach 1:
The patent monitors steering corrections that exceed predetermined thresholds rather than analyzing all steering inputs. By focusing only on corrective actions that indicate potential inattentiveness (sudden, large-angle corrections), the system achieves high reliability while minimizing computational requirements
Solution Approach 2:
The system establishes predetermined threshold values for steering angle, steering angular speed, and lane deviation during system initialization or calibration. These pre-set criteria enable real-time monitoring without complex runtime calculations, as the system only needs to compare current readings against the pre-determined thresholds
3Measurement precision
If only steering angle is monitored, then the system is simple, but it cannot effectively identify sudden steering corrections indicating inattentiveness
Solution Approach 1:
The patent introduces steering angular speed as an intermediary parameter between steering angle and driver state assessment. By calculating the rate of change of steering angle, the system identifies sudden corrections that indicate inattentiveness, bridging the gap between simple angle monitoring and complex driver state interpretation
Data Source
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AI summary
The invention relates to a method and to a device for recognising the state of a driver. According to the invention, the curve of a signal characterising the state of the driver is evaluated and in the event of a typical curve, a signal characterising the state of the driver is generated.