Tire Pressure Monitor Position Identification via Acceleration Analysis
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Solution Overview
Problem
Existing tire pressure monitoring systems cannot accurately differentiate between left and right tire pressure monitors due to similar temperature properties, making it difficult to determine their precise position on a vehicle.
Innovation Solution
A method and system utilizing an accelerometer and controller to detect radial and tangential accelerations, compute radial-versus-gravity and tangent-versus-gravity values, and determine the operating state changes to accurately identify the position of tire pressure monitors by analyzing the change sequence of these values, which are then used to distinguish between left and right positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature is used as a reference parameter to identify front or rear tire pressure monitors, then front and rear identification is simple, but left and right identification cannot be achieved due to similar temperature properties
Solution Approach 1:
The patent changes the reference parameter from temperature to acceleration characteristics. By detecting radial and tangential acceleration values and comparing them with reference values, the system can accurately identify left and right tire positions. This parameter change resolves the limitation of temperature-based identification while maintaining practical implementability.
Solution Approach 2:
The patent introduces acceleration sensors as intermediary devices to detect tire position. The sensors measure radial and tangential acceleration, which serve as intermediate parameters that can be processed to determine left and right positions. This intermediary approach enables precise identification without requiring direct observation of tire location.
2Measurement precision
If acceleration sensors are used to detect radial and tangential acceleration for position identification, then position identification accuracy is improved, but device complexity increases
Solution Approach 1:
The acceleration sensor serves multiple functions: it detects both radial and tangential acceleration components, provides data for position identification, and can potentially be used for other tire monitoring purposes. This multi-functionality justifies the added device complexity by maximizing the utility of the sensor.
Solution Approach 2:
The patent replaces complex mechanical position identification methods with acceleration-based detection. Instead of using mechanical markers or visual identification systems, the invention uses acceleration sensors to detect position through dynamic characteristics, simplifying the overall system while improving accuracy.
3Measurement precision
If multiple reference parameters are used to determine operating states and positions, then position identification accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent segments the identification process into distinct steps: detecting radial acceleration, detecting tangential acceleration, comparing with reference values, determining operating states, and finally identifying position. This segmentation makes the complex processing manageable and systematic, reducing the practical complexity despite using multiple parameters.
Solution Approach 2:
The system performs preliminary actions by pre-establishing reference values for radial and tangential acceleration. These reference values are determined in advance and stored, allowing the actual position identification to proceed by simple comparison rather than complex real-time calculation, thereby reducing processing complexity.
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 precise identification of tire pressure monitor positions as front-left, front-right, rear-left, or rear-right, enhancing the accuracy of tire pressure monitoring and preventing potential tire failures.
Implementation Method 1
an accelerometer, a wireless transmitter module and a controller. The accelerometer detects a radial acceleration and a tangential acceleration of the tire
Implementation Method 2
computing a radial-versus-gravity value and a tangent-versus-gravity value based on the radial acceleration, the tangential acceleration and a gravity acceleration
Data Source
AI summary
A method for determining position of a tire pressure monitor equipped on a tire of a vehicle. The method is performed by a controller and comprises: detecting a radial acceleration and a tangential acceleration of the tire; computing a radial-versus-gravity value and a tangent-versus-gravity value based on the radial acceleration, the tangential acceleration and a gravity acceleration; determining an operating state according to variations of the radial-versus-gravity value and the tangent-versus-gravity value; determining whether the operating state is changed to another operating state; and when the operating state is changed, determining a position of the tire pressure monitor according to a change sequence of the operating states.