Tire Pressure Monitoring System Initialization via Statistical Signal Counting
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Solution Overview
Problem
Existing tire pressure monitoring systems face challenges in rapidly reassigning wheel unit identifiers after interruptions in vehicle movement, leading to delayed alerts for low tire pressure, which can pose safety risks due to increased complexity and component costs, especially in heavy traffic conditions where radio frequency interference is common.
Innovation Solution
A method utilizing only an angular sensor and existing speed sensors to determine wheel unit identifiers and positions by counting receptions, applying statistical processing to identify candidate identifiers, and using angular position criteria to assign positions, thereby reducing the initialization time and component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If explicit initialization and locating processes are implemented in a single step with triggering units, then identifier recognition and position assignment are achieved simultaneously, but component costs and system complexity increase
Solution Approach 1:
The patent divides the initialization process into two separate stages: an initialization stage that collects identifiers using statistical methods, and a locating stage that assigns positions to identified wheel units. This segmentation eliminates the need for complex triggering units while maintaining efficient identifier recognition and position assignment.
2Adaptability or versatility
If statistical methods are used for identifier collection in heavy traffic conditions, then initialization can proceed with multiple vehicles present, but false conclusions or no conclusions may occur due to radio frequency interference
Solution Approach 1:
The patent implements a feedback mechanism where the central processing unit evaluates the reliability of collected identifiers by analyzing signal characteristics and comparison results. If the evaluation indicates low reliability (such as in heavy traffic conditions), the system can request re-initialization or use additional verification steps, thereby improving identifier recognition accuracy while maintaining adaptability to traffic conditions.
3Stability of the object's composition
If the system performs locating after relatively long stoppage, then tire position reassignment is achieved, but the system is occupied for a relatively long time delaying pressure monitoring and alerts
Solution Approach 1:
The patent performs preliminary identifier collection during the initialization stage before the vehicle stops, so that when the vehicle stops and requires locating, the central processing unit already has the identifiers stored. This preliminary action significantly reduces the time required for position reassignment after stoppage, allowing the system to quickly correlate identifiers with positions without occupying the system for a relatively long time.
4Measurement precision
If wheel units transmit identifiers at predetermined angular positions, then position information is embedded in transmissions, but additional angular sensors and processing complexity are required
Solution Approach 1:
The patent makes the existing angular position sensor in each wheel unit serve multiple functions: it not only monitors wheel rotation for tire pressure monitoring but also provides position information for identifier transmission and locating. By making this sensor multi-functional, the system achieves precise wheel position detection without adding separate angular sensors, thereby reducing overall device complexity while maintaining measurement precision.
Data Source
AI summary
In a method for determining identifiers of wheel units and positions relative to the vehicle of the wheels on which the wheel units are fitted, the vehicle is equipped with a speed sensor for each wheel and elements for transmitting at a predetermined angular position of the corresponding wheel about its axis a message including the identifier of the wheel unit. A central processing unit receives the message and information from the speed sensors. The method includes a) counting, for each identifier, of a number “nt” of receptions of the identifier, b) statistical processing of the numbers “nt” to determine candidate identifiers of a wheel unit of the vehicle, until the number of candidate identifiers at least equals the number of wheels, and c) determining that a candidate identifier is the identifier of a wheel unit if the candidate identifier meets a predetermined criterion.