TPMS Sensor Position Identification Using ABS Tooth Data
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Solution Overview
Problem
Existing tire pressure monitoring systems (TPMS) face errors in identifying the position of TPM sensors due to increased vehicle speed and require additional memory for storing wheel tooth information, leading to inaccuracies in determining the wheel position angle.
Innovation Solution
A tire pressure monitoring apparatus and method that involves a rotation sensor measuring and transmitting wheel position angle information, a TPM sensor attached to the tire, and a wheel tooth counter sensor, where the ECU calculates and compares the difference in position angle information to estimate and allocate the TPM sensor's ID to the correct tire based on wheel tooth data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the rotation sensor in the TPM sensor finds the same position angle as that of a previously transmitted wheel, then the TPM sensor can determine transmission position, but the number of errors increases according to an increase in vehicle speed
Solution Approach 1:
The system separates the position measurement function into two independent components: the rotation sensor in the TPM sensor measures position angle, while the wheel tooth counter sensor measures wheel tooth data. These two measurement systems operate independently and are compared by the ECU to identify sensor position, preventing error accumulation that occurs when a single system tries to track position across multiple transmissions.
Solution Approach 2:
The ECU acts as an intermediary that receives data from both the rotation sensor and wheel tooth counter sensor, compares the position angle information with wheel tooth data, and determines the correct sensor position. This intermediary comparison mechanism resolves the reliability issue by validating position information through cross-referencing two independent measurement systems.
2Duration of action of moving object
If the rotation sensor always maintains an ON state to measure position angle, then position information can be continuously obtained, but an additional memory capacitor is needed to store wheel tooth information during delay time
Solution Approach 1:
The system merges the position measurement function into the existing wheel tooth counter sensor that already operates continuously. Instead of requiring separate continuous operation of the rotation sensor and additional memory storage, the wheel tooth counter sensor's continuous operation provides both the position reference and the measurement data, eliminating the need for additional memory capacitors.
Solution Approach 2:
The wheel tooth counter sensor serves multiple functions: it continuously tracks wheel position (providing the reference frame), measures wheel tooth data for position verification, and eliminates the need for separate memory storage by providing continuous real-time data. This multi-functionality resolves both the continuity requirement and the memory complexity issue.
3Loss of time
If there is a delay time between rotation sensor measurement and ECU reception of data, then the system can process information, but additional memory storage is required to hold wheel tooth information during the delay
Solution Approach 1:
The wheel tooth counter sensor continuously measures and updates wheel position data in advance, maintaining a running count of wheel teeth. This preliminary continuous measurement ensures that when the ECU needs to compare position data, the most current wheel tooth information is already available, eliminating the need for temporary memory storage during delay periods.
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
This approach reduces errors in identifying the TPM sensor position by measuring wheel position angle information at random positions and estimating wheel tooth data, improving accuracy and eliminating the need for additional memory storage during delays.
Implementation Method 1
a rotation sensor measuring position angle information of a tire of a vehicle
Implementation Method 2
a wheel tooth counter sensor sensing wheel tooth counter and transmitting wheel tooth data
Data Source
AI summary
Provided are an apparatus and method for monitoring tire pressure, and in particular, a method of identifying a position of a TPM sensor attached to a tire using tooth data of ABS. The apparatus identifies the position of the TPM sensor using a point where tooth data of ABS has a variation different for each wheel, by estimating wheel tooth data from wheel position angle information measured by a rotation sensor of the TPM sensor, comparing the actual measured value with the estimated value, and recognizing that the TPM sensor is attached to a tire where the actual measured value is the same as or closest to the estimated value.