Tire-Ground Interface Detection for Aquaplaning Onset
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Solution Overview
Problem
Existing methods for determining tire-ground interface conditions in vehicles are ineffective in managing aquaplaning phenomena and require additional sensors, impairing the effectiveness of anti-aquaplaning systems.
Innovation Solution
A method utilizing existing vehicle data from the CAN network to calculate the degree of proximity to aquaplaning by estimating lift and comparing it with a threshold force, without additional sensors, using power train, dynamics, and wheel modules to enhance reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional sensors or equipment are used to determine interface conditions between tire and ground, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The system uses existing vehicle sensors and control units to determine interface conditions between tire and ground. The method processes data already available from the vehicle's power train control unit, dynamics control unit, and wheel control units, eliminating the need for additional dedicated sensors while maintaining measurement capability
Solution Approach 2:
Existing vehicle control units are made multi-functional by having them perform both their original functions and the additional function of determining interface conditions. The power train control unit, dynamics control unit, and wheel control units process multiple types of data to provide comprehensive interface condition information
2Device complexity
If existing vehicle data is used to determine interface conditions, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The system merges data from multiple existing sources including power train control unit, dynamics control unit, and wheel control units. By combining information from these different control units that already exist in the vehicle, the system achieves comprehensive interface condition determination without adding new sensors
Solution Approach 2:
The method uses existing control units as intermediaries to access and process interface condition data. Rather than directly measuring interface conditions, the system uses the power train control unit and other control units as mediators to infer interface conditions from their existing measurements
3Device complexity
If known methods are used for vehicle control, then device complexity is maintained, but reliability of anti-aquaplaning system deteriorates
Solution Approach 1:
The system determines interface conditions in advance to prepare the anti-aquaplaning system for intervention. By continuously monitoring interface conditions using existing data, the system can prepare preventive measures before aquaplaning occurs, improving reliability through early detection and preparation
Solution Approach 2:
The method implements feedback by continuously determining interface conditions and using this information to control the anti-aquaplaning system. The control units process ongoing data from vehicle operation to provide continuous feedback on interface conditions, enabling dynamic adjustment of anti-aquaplaning measures
Data Source
AI summary
A method is described for determining interface conditions between a tire and the ground in a motor vehicle, particularly to determine an onset of an aquaplaning phenomena. The method includes: determining a reference longitudinal acceleration of the vehicle, measuring an actual longitudinal acceleration of the vehicle, calculating a difference between the reference longitudinal acceleration and the actual longitudinal acceleration, determining an additional drag at the interface between tire and ground on the basis of the difference, and a lift at the interface between tire and ground on the basis of the additional drag, and determining a threshold force at which a lifting of the tire from the ground occurs, comparing the lift with the threshold force and determining a degree of proximity of the interface conditions between tire and ground to an aquaplaning condition.