Vehicle Surface Adaptation via Wheel Slip Threshold Optimization
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Solution Overview
Problem
The challenge in vehicle anti-lock braking systems (ABS) is the difficulty in measuring road surface friction coefficients, which is crucial for efficient braking, and the high cost of sensors used in these systems.
Innovation Solution
A surface adaptation method and device that evaluates longitudinal forces and wheel slips at multiple sampling points to determine a wheel slip threshold, using a processing circuit and storage device to optimize wheel slip control without additional costly sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If road surface friction coefficient is measured using traditional sensors, then braking control accuracy is improved, but system cost increases
Solution Approach 1:
The system uses existing vehicle sensors (wheel speed sensor, longitudinal acceleration sensor) to self-determine wheel slip and estimate road surface friction characteristics without requiring additional dedicated measurement sensors. The vehicle's own operational data serves the dual purpose of control and surface characterization.
Solution Approach 2:
Wheel slip serves as an intermediary parameter that connects measurable quantities (wheel speed, vehicle acceleration) with the difficult-to-measure road surface friction coefficient. By measuring wheel slip indirectly through existing sensors and using it to infer friction characteristics, the system avoids direct friction measurement while achieving equivalent control accuracy.
2Productivity
If wheel slip is monitored continuously with high precision, then anti-lock braking efficiency is improved, but measurement and control complexity increases
Solution Approach 1:
The wheel slip calculation methodology serves multiple functions simultaneously: it provides the basis for anti-lock braking control, enables road surface friction estimation, and supports adaptive braking strategy selection. This single multi-functional approach replaces what would otherwise require separate monitoring and control systems.
Solution Approach 2:
The system dynamically determines wheel slip threshold values based on detected road surface characteristics rather than using fixed thresholds. This adaptive parameter adjustment allows efficient anti-lock braking across varying road conditions (ice, snow, dry asphalt) without requiring complex real-time friction measurement, as the threshold adapts to match actual surface properties.
Data Source
AI summary
A surface adaptation method suitable for a vehicle includes evaluating a plurality of longitudinal forces with respect to a plurality of sampling points, evaluating a plurality of wheel slips with respect to the plurality of sampling points, determining a maximum longitudinal force from the plurality of longitudinal forces, and determining a wheel slip threshold from the plurality of wheel slips. The wheel slip threshold corresponds to the maximum longitudinal force.