Wheel Electronics Localization via Rotational Direction Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing tire pressure monitoring systems face challenges in efficiently localizing individual wheels within a double wheel configuration of motor vehicles, requiring high technical outlay to distinguish between inner and outer wheels and prevent interference, especially in commercial vehicles like buses and trucks.
Innovation Solution
A method that determines the axle, vehicle side, direction of travel, and rotational direction of wheels using a combination of signal analysis, field strength evaluation, and acceleration measurements to automatically localize individual wheels within a double wheel setup, reducing the need for complex LF and HF signal management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If low frequency trigger signals are used to determine wheel position in double wheel configurations, then wheel localization is achieved, but technical outlay increases due to the need to prevent interference signals and multiple responses
Solution Approach 1:
The patent replaces complex low frequency trigger signal management with a simpler high frequency signal-based rotational direction detection system. Instead of using LF trigger units and managing trigger sequences to distinguish inner/outer wheels, the invention uses the natural rotational direction information from the wheel sensor itself, transmitted via HF signals, to automatically determine wheel position.
Solution Approach 2:
The wheel sensor system provides its own localization information through the rotational direction data it already generates for other purposes. The system uses its inherent rotational direction detection capability to automatically determine whether it is mounted on the inner or outer wheel of a double wheel configuration, without requiring external trigger units or complex positioning infrastructure.
2Measurement precision
If high frequency field strength analysis is used for axle localization, then localization information can be obtained, but technical outlay becomes extremely high due to the need to account for many influencing parameters
Solution Approach 1:
The patent replaces complex HF field strength analysis with a simpler rotational direction-based localization method. Instead of measuring and analyzing HF field strength variations that are influenced by numerous parameters (distance, orientation, interference), the system directly uses the rotational direction information already available from the wheel sensor to determine axle position and wheel identity.
Solution Approach 2:
The invention changes the localization parameter from HF field strength (which is highly variable and requires complex compensation) to rotational direction (which is binary and stable). By using rotational direction as the localization parameter instead of field strength, the system achieves accurate wheel identification without needing to account for the many parameters that influence HF signal propagation.
3Reliability
If manual programming of wheel position is used in diagnosis commands, then localization information is stored, but automatic localization is not achieved
Solution Approach 1:
The system automatically determines wheel position and identity through the rotational direction data that the wheel sensor generates during normal operation. The control unit automatically processes this rotational direction information to identify which wheel is being monitored, eliminating the need for manual programming while maintaining accurate localization data.
Solution Approach 2:
The system uses feedback from the wheel sensor's rotational direction measurements to automatically update the localization information in the control unit. As the wheel rotates and the sensor detects directional changes, this information is fed back to the control unit, which automatically determines the wheel's position and identity without requiring manual intervention.
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 completely automatic localization of individual wheels with reduced technical complexity, enhancing customer-friendliness and flexibility by accurately determining wheel positions within double wheels with lower technical requirements compared to prior methods.
Implementation Method 1
the rotational direction of the wheel is determined with an acceleration sensor for instance
Implementation Method 2
the rotational direction information of the wheel is used to determine the mounting position of the wheel in respect of the side of the motor vehicle
Data Source
AI summary
A method for localizing individual wheels and/or wheel identifiers of individual wheels of a double wheel of a motor vehicle includes the following steps: determining the axle of the respective double wheel; determining the motor vehicle side of the respective double wheel; determining the position of the respective double wheel by the position of the axle and the position of the motor vehicle side; determining the direction of travel of the motor vehicle; determining the direction of rotation of the individual wheels and/or wheel identifiers of the respective double wheel; localization of the individual wheels and/or wheel identifiers of the individual wheels by the position of the associated double wheel, the direction of travel of the motor vehicle and the rotational directions of the individual wheels and/or wheel identifiers.