Vehicle Wheel Load Determination via Tire Deformation and Acceleration
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Solution Overview
Problem
Existing methods for determining dynamic wheel loads on vehicle wheels are limited by the need for multiple revolutions, high power consumption, and interference from road unevenness, making it difficult to achieve high time resolution and accurate measurements, especially during dynamic driving conditions.
Innovation Solution
A method that calculates dynamic wheel loads using deformation and pressure measurements, combined with acceleration data, and adjusts for static wheel loads using a statistical analysis to enable high-time-resolution dynamic load determination, even during vehicle acceleration and deceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If deformation and pressure measurements are taken more frequently to improve time resolution, then dynamic wheel loads can be determined more accurately, but battery power consumption increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing static wheel load values during periods when the vehicle is stationary or moving at constant speed. These pre-calculated values are then used as a basis for determining dynamic wheel loads during acceleration or deceleration, eliminating the need for continuous high-frequency measurements and thereby reducing power consumption while maintaining measurement precision.
Solution Approach 2:
The patent implements dynamics by adapting the measurement and calculation frequency based on the vehicle's actual driving state. During dynamic phases (acceleration/deceleration), the system uses the pre-calculated static loads combined with current acceleration data. During steady-state phases, the system updates the static load values. This dynamic adaptation optimizes the balance between measurement precision and energy consumption.
2Reliability
If deformation measurements are filtered to eliminate road unevenness interference, then measurement reliability improves, but the time required to obtain reliable data increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating static wheel load values during periods when the vehicle is stationary or moving at constant speed, when road unevenness has minimal impact. These pre-calculated reliable values are then stored and used during dynamic driving phases, eliminating the need to wait for filtering to complete during critical measurement periods and thereby reducing time loss while maintaining reliability.
3Measurement precision
If static wheel loads are determined by rejecting dynamic measurement data, then accuracy of static load determination improves, but the system cannot capture dynamic wheel load changes
Solution Approach 1:
The patent applies segmentation by separating the wheel load determination into two distinct components: static wheel load values (determined during steady-state conditions) and dynamic wheel load values (calculated during acceleration/deceleration using the static values as a base). This segmentation allows the system to maintain high accuracy for static loads while simultaneously capturing dynamic load changes, thereby resolving the contradiction between precision and adaptability.
Solution Approach 2:
The patent implements dynamics by creating a system that adapts its measurement and calculation approach based on the vehicle's driving state. The system dynamically switches between using filtered static measurement data (for accuracy) and using acceleration-based calculations combined with pre-calculated static loads (for capturing dynamic changes). This dynamic approach enables the system to maintain measurement precision for static loads while gaining the adaptability to accurately determine dynamic wheel loads.
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
This approach allows for quick and accurate determination of dynamic wheel loads immediately after vehicle start-up and during dynamic driving conditions, improving the ability to map dynamic travel effects with reduced battery consumption and minimal interference from road irregularities.
Implementation Method 1
detecting deformation measured values which are representative of a deformation of the respective tire
Implementation Method 2
detecting pressure measured values which are representative of an internal pressure of the respective tire
Implementation Method 3
detecting at least one acceleration measured value which is representative of an acceleration of the vehicle
Data Source
AI summary
A method and a device for determining loads on vehicle's wheels, each with a tire, is disclosed. A deformation measured value and a pressure measured value for each tire, and at least one acceleration measured value for the vehicle are detected. For the respective wheels, dynamic wheel loads are calculated according to a first model and static wheel loads are calculated according to a second model. The second model comprises at least one model parameter calculated by statistical analysis of the calculated dynamic wheel loads, the calculated static wheel loads, and the detected at least one acceleration measured value. The at least one acceleration measured value is redetected and the dynamic wheel loads are recalculated from the previously calculated static wheel loads and the at least one detected acceleration measured value according to the second model using the previously calculated at least one model parameter of the second model.