Vehicle Speed Data Analysis for Road Freezing Detection
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Solution Overview
Problem
Existing driving assistance systems struggle to distinguish between slips caused by road freezing and other factors, as they primarily detect the coefficient of friction after a slip has occurred, making it difficult to accurately detect road freezing conditions.
Innovation Solution
A driving assistance apparatus that calculates the coefficient of sliding friction using vehicle speed data before and after the anti-lock braking system (ABS) activation, and determines if the coefficient is below a threshold, also considering the ABS operation period, to differentiate between slips due to road freezing and other causes, and outputs road freezing information to other vehicles or external servers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the coefficient of friction is detected using acceleration data during slip detection, then the detection of slip occurs, but the ability to distinguish road freezing from other slip causes is insufficient
Solution Approach 1:
The system performs preliminary detection of vehicle speed data before ABS activation and after ABS stops, calculating the coefficient of sliding friction in advance. This preliminary action allows the system to identify road freezing conditions before they are lost during the slip event, resolving the contradiction by preserving road condition information that would otherwise be unavailable.
Solution Approach 2:
The invention adds a temporal dimension to the detection by comparing vehicle speed data at three distinct time points: before ABS activation, during ABS operation, and after ABS stops. This multi-temporal approach provides additional information dimensions that enable differentiation between road freezing and other slip causes, overcoming the limitation of single-point detection.
2Device complexity
If only the coefficient of friction during slip is detected, then the detection process is simple, but the distinction between road freezing slip and other slip causes cannot be made
Solution Approach 1:
The detection process is segmented into three distinct measurement phases: acquiring vehicle speed data before ABS activation, acquiring data when ABS stops, and calculating the coefficient of sliding friction from these segmented measurements. This segmentation maintains procedural simplicity while enabling accurate road freezing identification through comparative analysis of the segmented data points.
3Measurement precision
If vehicle speed data is acquired at multiple time points, then the accuracy of road freezing detection is improved, but the data processing complexity increases
Solution Approach 1:
The system utilizes vehicle speed data that is already being collected by the vehicle's existing sensors and ABS system for the purpose of road freezing detection. By repurposing already-acquired data rather than requiring additional dedicated sensors or complex measurement systems, the invention improves detection accuracy while avoiding the complexity of new data acquisition infrastructure.
Data Source
AI summary
A driving assistance apparatus includes a processor having hardware. The processor is configured to acquire vehicle speed data before an ABS of a vehicle is activated and vehicle speed data when the ABS of the vehicle is stopped, calculate a coefficient of sliding friction based on the vehicle speed data before the ABS is activated and the vehicle speed data when the ABS is stopped, determine whether the coefficient of sliding friction is equal to or smaller than a threshold, and detect that a slip due to road freezing has occurred when the coefficient of sliding friction is equal to or smaller than the threshold.