Vehicle Road Contact Calibration for Accurate Sensor-Based Detection
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Solution Overview
Problem
Existing methods for determining road contact parameters, such as road surface conditions and tire properties, lack accuracy and reliability, particularly in varying road conditions.
Innovation Solution
A method involving defining calibration sections within a road network, assigning section-specific values to these sections, and using vehicle sensors to determine road contact parameters within these sections, ensuring the parameters remain constant or vary within predetermined thresholds, with calibration adjustments based on vehicle state and environmental factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensors are used to determine road contact parameters in varying road conditions, then measurement capability is provided, but measurement precision deteriorates due to inconsistent and unreliable data
Solution Approach 1:
The road network is divided into multiple calibration sections, each with predetermined section-specific values for road contact parameters. This segmentation allows the system to account for spatial variations in road conditions, applying appropriate calibration values for each specific section rather than using a single universal calibration, thereby improving measurement precision and reliability
Solution Approach 2:
Different calibration sections are assigned different section-specific values or value ranges based on their local road characteristics (e.g., wetness level, coefficient of friction, roughness). This local quality approach ensures that each road section is calibrated according to its specific conditions, resolving the contradiction between measurement precision and reliability by adapting to local variations
2Measurement precision
If calibration sections are defined with predetermined values, then determination accuracy is improved, but device complexity increases due to the need to manage multiple calibration sections and section-specific values
Solution Approach 1:
The server device performs multiple functions: it stores information about multiple calibration sections, determines whether the vehicle is located within a calibration section, provides the section-specific values, and monitors calibration status. This multi-functionality reduces device complexity by consolidating calibration management tasks into a single centralized system rather than requiring complex local calibration mechanisms in each vehicle
Solution Approach 2:
A server device acts as an intermediary between the vehicle's sensor system and the calibration data. The server stores and manages the calibration section information and section-specific values, then provides this information to vehicles as needed. This intermediary approach simplifies the overall system architecture by centralizing calibration management externally rather than embedding complex calibration logic within each vehicle
3Reliability
If section-specific values are assigned to calibration sections, then determination reliability is improved, but loss of information increases due to the need to store and retrieve calibration data
Solution Approach 1:
Instead of storing complete calibration datasets locally in each vehicle, the system uses a server to store the master copy of calibration section information and section-specific values. Vehicles retrieve only the necessary calibration data for their current location through wireless communication. This copying approach reduces information loss by maintaining a centralized authoritative source while minimizing local storage requirements
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
Enables reliable and accurate determination of road contact parameters, even in varying conditions, by ensuring consistent sensor readings and adaptive calibration, improving vehicle operation safety and efficiency.
Implementation Method 1
at least one vehicle sensor (3) and at least one evaluation unit (4)... determining at least one road contact parameter FKP by evaluating at least one output signal of the vehicle sensor (3)
Data Source
Figure 1~4
Figure 5~6
AI summary
The invention relates to a method and a device for determining at least one road contact parameter (CKP) of a vehicle (1), which represents a road surface and/or tire property of the vehicle (1), comprising: • Defining (FK) at least one calibration section (KA, KA1, KA2, KA3) in a road network (2), wherein at least one section-specific value or value range of the at least one road contact parameter (CKP) is assigned to the calibration section (KA, KA1, KA2, KA3), • Determining (B1) whether the vehicle (1) is located in the calibration section (KA, KA1, KA2, KA3), • Determining (B2) the at least one road contact parameter (CKP) by evaluating at least one output signal of a vehicle sensor (3), which is generated during the journey of the vehicle (1) in the at least one calibration section (KA, KA1, KA2, KA3).