TPMS Transmitter Time Drift Correction Using Prime Number Offsets

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Solution Overview

Problem

In traditional Tire Pressure Monitoring Systems (TPMS), the slight variations in oscillation times of tire pressure transmitters can cause their transmission intervals and times to drift, leading to simultaneous data transmission from multiple transmitters, resulting in data loss as the receiver cannot receive data from all transmitters simultaneously.

Innovation Solution

The method involves using multiple transmitters to transmit data at initial prime number times within a transmission interval, adjusting these times with accumulated values to ensure each transmitter sends data at distinct times, preventing simultaneous transmission and ensuring the receiver can receive all data.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If transmitters use predetermined transmission times within each transmission interval, then the system structure is simple and easy to implement, but transmission time drift occurs causing simultaneous data transmission from multiple transmitters

Engineering Contradiction:

Improveease of implementationVSAvoiddata transmission reliability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent applies dynamics by making the transmission times adjustable rather than fixed. Each transmitter's transmission time is dynamically modified by adding accumulated values that are multiples of different prime numbers, allowing the system to adapt to drift while maintaining simple initial setup. This resolves the contradiction by enabling easy implementation through fixed prime number assignments while achieving reliability through dynamic time adjustment.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the transmission time parameter by adding accumulated values (multiples of prime numbers) to the base transmission times. This parameter modification ensures that even when drift occurs, the transmission times remain distinct. The principle resolves the contradiction by maintaining simple predetermined base times while introducing parameter changes through accumulated values to prevent simultaneous transmission.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If transmitters operate with slightly different basic oscillation times, then each transmitter can function independently, but transmission intervals and times drift causing data loss at the receiver

Engineering Contradiction:

Improveindependent transmitter operationVSAvoiddata loss

Core Design Contradiction:

Adaptability or versatilityVSLoss of information

Solution Approach 1:

The patent segments the transmission time allocation by assigning different prime numbers to different transmitters. This segmentation ensures that each transmitter operates independently with its own unique time offset (multiple of its assigned prime number), preventing overlap while maintaining independent operation. The segmentation principle resolves the contradiction by allowing independent operation through unique prime number assignments while preventing data loss through structured time separation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements periodic action by having each transmitter add accumulated values (multiples of their assigned prime numbers) to their transmission times at regular intervals. This periodic adjustment ensures that transmission times remain synchronized and distinct over multiple transmission cycles, preventing data loss while allowing independent transmitter operation. The periodic nature resolves the contradiction by maintaining independent operation while systematically preventing time drift conflicts.

Inventive Principle:

Principle #19Periodic action

3Productivity

If the receiver attempts to receive data from multiple transmitters simultaneously, then real-time monitoring is achieved, but data collision occurs causing loss of tire pressure data

Engineering Contradiction:

Improvereal-time monitoring capabilityVSAvoidtire pressure data loss

Core Design Contradiction:

ProductivityVSLoss of information

Solution Approach 1:

The patent applies preliminary action by pre-calculating and assigning different prime number multiples as transmission time offsets to each transmitter before operation begins. This preliminary time allocation ensures that transmitters will not collide even when operating simultaneously, allowing the receiver to continuously monitor all transmitters without data loss. The preliminary action resolves the contradiction by enabling real-time monitoring while preventing collisions through advance time planning.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS8213973B2Method for transmitting data

Publication Date: 2012.07.03 UNIVERSAL SCIENTIFIC INDUSTRIAL (SHANGHAI) CO LTD

AI summary

A method for transmitting data is applied to a receiver and a plurality of transmitters. The steps comprise respectively transmitting a data to the receiver at different first transmission times within a transmission interval by the transmitters. Next, the different first transmission times are respectively added with different accumulated values to become the different second transmission times. The different accumulated values are respectively added with a multiple of the different first transmission times. Finally, the transmitters respectively transmit a next data to the receiver at the different second transmission times within a next transmission interval.