TPMS Sensor Autolocation via Modulated LF Signals

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Solution Overview

Problem

Conventional tire pressure monitoring systems (TPMS) require reprogramming when tires are rotated or sensors are replaced, necessitating special tools and user interaction to recreate sensor ID code mappings to wheel locations.

Innovation Solution

A system utilizing low-frequency initiator coils with directional antennas that emit modulated signals, allowing tire pressure sensors to automatically detect and report their location to a controller, eliminating the need for reprogramming by correlating modulation frequencies with axle and wheel end positions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional TPMS reprogramming methods are used, then sensor ID code mapping to wheel locations can be established, but special tools and user interaction are required, increasing system complexity and operation time

Engineering Contradiction:

Improvesensor ID code mapping accuracyVSAvoidprogramming tool requirements

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The TPMS sensor automatically performs location identification by detecting trigger signals from initiators mounted on wheel hubs. The sensor self-determines its wheel position without requiring external programming tools or user interaction, eliminating the complexity of conventional reprogramming methods while maintaining accurate sensor ID code mapping to wheel locations

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent replaces the mechanical/manual reprogramming process with an automated electromagnetic signal-based system. Initiators emit trigger signals that sensors detect to automatically determine wheel positions, substituting the manual tool-based programming approach with an automated signal recognition system

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Adaptability or versatility

If conventional reprogramming methods are used, then sensor locations can be updated after tire rotation or sensor replacement, but programming time and user interaction are required, reducing productivity

Engineering Contradiction:

Improvesensor location reconfiguration capabilityVSAvoidreprogramming speed

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

Initiators are pre-installed on wheel hubs and continuously emit trigger signals with encoded wheel position information. When sensors are replaced or tires rotated, the sensors immediately detect these pre-existing signals and automatically determine their locations without requiring any reprogramming action, enabling instant adaptation and maintaining high productivity

Inventive Principle:

Principle #10Preliminary action

3Measurement precision

If trigger signals are transmitted from each axle at specific angles, then sensor location can be determined by signal reception, but the system requires precise angular orientation and multiple devices, increasing device complexity

Engineering Contradiction:

Improvewheel position detection accuracyVSAvoidnumber of initiator devices

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

Each initiator device is designed to emit trigger signals that can be detected by multiple sensors across different wheel positions. The initiators use coded signals that encode wheel position information, allowing a single initiator to serve multiple detection purposes and reducing the total number of devices required while maintaining precise position detection accuracy

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent introduces coded trigger signals as an intermediary carrier that conveys wheel position information from initiators to sensors. These coded signals act as a mediator that enables precise position determination without requiring direct physical orientation or multiple dedicated devices for each sensor-initiator pair

Inventive Principle:

Principle #24Intermediary (Mediator)

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 automatic mapping of TPMS sensors to wheel locations without user interaction, reducing programming overhead and maintaining system functionality during tire rotation or sensor replacement.

Implementation Method 1

Each antenna emits a signal that is modulated at a different frequency relative to other antennas

Methodology Applied

Scientific EffectElectromagnetic radiation: Electromagnetic Induction

Data Source

PatentUS9851227B2TPMS sensor autolocation through low frequency programming

Publication Date: 2017.12.26 BENDIX COMMERCIAL VEHICLE SYSTEMS LLC

AI summary

In order to mitigate a need for reprogramming tire pressure sensors after tire rotation, tire change, etc., all sensors on a vehicle are preprogrammed with a lookup table that correlates modulation frequency to axle and wheel end positions on the vehicle. Dual antenna initiator coils are mounted to a vehicle such that each wheel end has one directional antenna directed toward it. Each initiator coil is programmed to modulate its transmission frequency by a predetermined modulation frequency such that each antenna transmits using a different modulation frequency. Each sensor receives a modulated signal, identifies the modulation frequency, and performs a table lookup to determine its axle and wheel end location. The sensor transmits its identified wheel end and axle location to a controller unit along with tire pressure status information for its wheel.