Adaptive Braking Trajectory for Tire Wear Compensation
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Solution Overview
Problem
The evaluation of tire performance is compromised by track wear during braking tests, leading to inconsistent grip measurements due to varying wear levels on different strips of the test track, which affects the accuracy of tire scoring.
Innovation Solution
A method that selects strips based on wear levels to determine a theoretical trajectory for the vehicle, ensuring consistent braking conditions by minimizing the impact of track wear, and includes a system to validate the test trajectory for robust performance evaluation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the vehicle always rolls along the same predetermined trajectory, then the test procedure is simple and easy to operate, but the same strips of the track are worn repeatedly leading to inconsistent grip measurements
Solution Approach 1:
The patent applies dynamics by making the test trajectory adaptive rather than fixed. The control unit dynamically adjusts the trajectory based on real-time wear detection data, allowing the vehicle to automatically select less worn strips. This resolves the contradiction by maintaining operational simplicity through automation while ensuring measurement consistency through adaptive path selection.
Solution Approach 2:
The patent implements feedback by using wear detection means to continuously monitor strip wear levels and feeding this information back to the control unit. The control unit then adjusts the trajectory accordingly, creating a closed-loop system that maintains measurement consistency while preserving ease of operation through automated feedback-driven adjustments.
2Productivity
If multiple braking tests are performed on the same track, then tire performance evaluation is comprehensive, but track wear accumulates leading to degraded test accuracy
Solution Approach 1:
The patent applies preliminary action by detecting strip wear levels before conducting braking tests. The control unit uses this advance information to plan a trajectory that avoids heavily worn strips, allowing multiple tests to be performed accurately without the degradation that would occur with repeated use of the same strips.
Solution Approach 2:
The system dynamically adapts the test trajectory based on accumulated wear data from multiple tests. This allows comprehensive tire performance evaluation across multiple tests while maintaining measurement accuracy by continuously routing the vehicle through less worn portions of the track.
3Device complexity
If the trajectory is manually controlled, then the system is simple, but human error affects trajectory validation and test consistency
Solution Approach 1:
The patent implements self-service by enabling the control unit to automatically validate whether the vehicle followed the intended trajectory using detection means. This automated self-validation eliminates human error while keeping the system relatively simple, as the same existing sensors are used for both wear detection and trajectory validation.
Solution Approach 2:
The patent replaces manual trajectory validation with an automated electronic validation system. The control unit electronically monitors and validates the actual trajectory against the intended trajectory, substituting human judgment with automated detection that improves reliability without significantly increasing complexity.
Data Source
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AI summary
The invention relates to a method for driving assistance for a vehicle (11) during a braking test of said vehicle on a track (1), said track being divided into a plurality of adjacent strips (Z1,..., Zn) extending mainly in the length direction of the track, the width (Iz) of each strip being larger than or equal to the width of the tires (3, 5, 7, 9) of the vehicle, each strip being worn upon each braking of the vehicle on said strip. The assistance method comprises a step of selecting at least one strip from the plurality of strips on the track, said strip being selected on the basis of the wear level thereof. The assistance method further includes a step of determining a theoretical trajectory (21) of the vehicle so that when following said theoretical trajectory, the vehicle is capable of braking on the selected strip.