Steering Hysteresis Compensation for Driver Fatigue Detection
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Solution Overview
Problem
Current fatigue detection methods for motor vehicle drivers fail to accurately account for hysteresis in the steering angle signal, leading to inconsistent performance due to production deviations and aging of the steering system, which affects the reliability of fatigue detection across different vehicles.
Innovation Solution
A method that determines the actual hysteresis of the steering system during vehicle operation and incorporates this information into the fatigue detection process, either directly or by adjusting signals and parameters, to minimize performance deviations and ensure reliable fatigue detection over the vehicle's lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If hysteresis in the steering angle signal is not taken into account when calculating fatigue, then the fatigue detection algorithm can be applied based on a driving set with a specific hysteresis, but the fatigue detection performance changes depending on hysteresis and deviations occur in different vehicles
Solution Approach 1:
The patent applies preliminary action by determining the hysteresis of the steering system in advance, before fatigue detection is performed. The method includes determining a hysteresis of the steering system and taking the detected hysteresis into account in the determination of driver fatigue. This allows the system to pre-characterize the steering system's hysteresis behavior and use this information to compensate for variations across different vehicles and over time, ensuring consistent fatigue detection performance.
2Measurement precision
If hysteresis is determined and taken into account in fatigue determination, then fatigue detection accuracy and consistency are improved, but the device complexity increases
Solution Approach 1:
The patent implements feedback by determining the hysteresis of the steering system and using this determined hysteresis information to adjust and improve the fatigue detection process. The system continuously monitors the steering angle signal, determines the hysteresis characteristics, and feeds this information back into the fatigue determination algorithm. This feedback mechanism allows the system to adapt to actual steering system behavior, compensating for variations and improving measurement precision without requiring complex hardware modifications.
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 approach enhances the accuracy and consistency of fatigue detection by accounting for hysteresis, reducing hardware costs and maintaining performance across varying vehicle conditions, thereby improving road safety and reliability.
Implementation Method 1
a steering angle sensor (2) having an analog output is assigned to the steering device (2). The analog output signal of the steering angle sensor (2) is evaluated
Data Source
AI summary
The present disclosure relates to a method for determining the fatigue of a driver of a motor vehicle, wherein the fatigue is determined while taking into account the steering behavior of the driver, characterized in that the method includes the following steps: determination of a hysteresis of the steering system or the fatigue detection system, and taking into account the detected hysteresis in the determination of the fatigue of the driver. Furthermore, the disclosure relates to a device that is set up to execute the method.