Wheel State Variable Determination via Vehicle-Wheel Sensor Fusion
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Solution Overview
Problem
Existing systems for determining tire or wheel state variables, such as wheel load, are limited by short device lifespan due to battery life and legal transmission intervals, leading to indirect and inaccurate measurements.
Innovation Solution
A method and device that continuously measure physical wheel state variables on the vehicle side, with intermittent direct measurements from the wheel side, using existing vehicle control units to correct and refine data for precise determination of wheel state variables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wheel-side measuring devices are used to directly measure tire or wheel condition variables, then measurement precision is improved, but device complexity and cost increase due to additional components
Solution Approach 1:
The patent combines vehicle-side control units (ABS, ESP, driving stability control) that already exist in the vehicle with wheel-side sensors to create an integrated measurement system. This merging approach allows direct wheel measurement capability without adding completely new complex devices, as existing control units are utilized for data processing and transmission.
Solution Approach 2:
Existing vehicle control units serve multiple functions: they control braking systems, stability control, and simultaneously process wheel condition data. This multi-functionality reduces the need for dedicated separate measurement devices, lowering overall system complexity while maintaining precise measurement capabilities.
2Productivity
If wheel-side measuring devices transmit data frequently to improve continuous monitoring, then productivity is improved, but use of energy deteriorates due to battery consumption
Solution Approach 1:
The system implements periodic data transmission where wheel-side sensors measure continuously but transmit data at predetermined intervals rather than continuously. This periodic transmission mode maintains monitoring capability while significantly reducing energy consumption compared to continuous transmission, allowing battery-powered wheel devices to operate for extended periods.
3Use of energy by moving object
If data transmission interval is increased to save energy and reduce complexity, then loss of information worsens due to inability to capture dynamic changes
Solution Approach 1:
The system uses feedback mechanisms where vehicle-side control units continuously receive and process wheel condition data at predetermined intervals. This feedback loop allows the system to maintain up-to-date information about wheel state by systematically collecting and evaluating data periodically, ensuring dynamic changes are captured while maintaining energy efficiency.
4Device complexity
If indirect measurement methods are used to avoid additional wheel-side devices, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent merges indirect vehicle-side measurements with direct wheel-side sensor data. Vehicle-side control units continue to use indirect measurement methods (reducing complexity) while simultaneously receiving direct measurement data from wheel-side sensors (improving precision). The combination of both approaches allows the system to maintain low complexity while achieving high measurement accuracy.
Data Source
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AI summary
In order to more accurately determine wheel state variables of a wheel, physical variables of the wheels are continuously measured and evaluated on the vehicle side. In addition, physical variables of the wheel are intermittently measured on the wheel side. The variables measured on the wheel side or the evaluated measurement results thereof are used to correct the variables measured on the vehicle side and/or the determined wheel state variables.