Intelligent Tire Sensor Module Relative Rotation
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Solution Overview
Problem
Existing intelligent tire systems face limitations in measurement precision due to the sensor being rotated with the wheel rim, resulting in tire variation being measured only once per rotation, which restricts the ability to improve precision in tire variation measurement.
Innovation Solution
A bearing assembly encloses the wheel rim and includes a sensor module that relatively rotates with respect to the wheel rim, allowing continuous sensing of the tire's inner surface, using a camera sensor and light source to capture patterns on the tire, and a magnetic system to stabilize the sensor module, enabling precise variation measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor is fixed to the wheel rim and rotates together with the wheel, then the sensor can sense the tire variation, but the measurement precision is limited because the variation is measured only once per one rotation of the wheel rim
Solution Approach 1:
A bearing assembly is introduced as an intermediary mechanism between the wheel rim and the sensor module. The bearing assembly enables the sensor module to rotate independently from the wheel rim, allowing the sensor to continuously measure tire variation while the wheel rotates. This mediator decouples the rotation of the wheel from the measurement process, enabling high-frequency continuous measurement without being constrained by wheel rotation speed.
Solution Approach 2:
The sensor module is designed to rotate dynamically relative to the wheel rim through the bearing assembly. Instead of being fixed to the rotating wheel rim, the sensor module can rotate independently to maintain continuous contact with the tire inner surface. This dynamic configuration allows the sensor to adapt its position and continuously measure tire variation throughout the wheel rotation cycle, dramatically increasing measurement frequency from once per rotation to continuous measurement.
2Measurement precision
If the sensor module rotates with the wheel rim, then the structure is simple, but the sensor cannot continuously sense the tire inner surface
Solution Approach 1:
The bearing assembly serves as a mediator that enables independent rotation of the sensor module from the wheel rim. This intermediary mechanism allows the sensor to continuously track the tire inner surface while the wheel rotates, achieving continuous measurement capability. The bearing assembly is a well-established mechanical component that provides relative rotation capability without requiring complex custom mechanisms.
Solution Approach 2:
The system is segmented into two independently rotating components: the wheel rim and the sensor module. The sensor module is separated from the wheel rim rotation through the bearing assembly, allowing it to rotate independently to continuously sense the tire inner surface. This segmentation enables the sensor to maintain continuous contact with the tire while the wheel rotates, achieving continuous measurement without requiring the entire assembly to rotate together.
3Productivity
If a bearing assembly is introduced to enable relative rotation, then continuous sensing is enabled, but the device complexity increases
Solution Approach 1:
The bearing assembly is introduced as a standardized intermediary component to enable continuous measurement. While it does increase device complexity, it is a well-established mechanical component that provides reliable relative rotation capability. The bearing assembly enables the sensor module to rotate independently from the wheel rim, allowing continuous sensing of the tire inner surface throughout the wheel rotation cycle, dramatically increasing measurement frequency from once per rotation to continuous measurement.
Solution Approach 2:
The bearing assembly serves multiple functions: it enables relative rotation between the sensor module and wheel rim, supports the sensor module weight, and allows the sensor to maintain continuous contact with the tire inner surface. By using this multi-functional component, the system achieves continuous measurement capability without requiring multiple separate mechanisms, thereby limiting the increase in overall device 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
This configuration allows for continuous and precise measurement of tire variation, enhancing the accuracy of slip angle and road friction coefficient estimation, thereby improving driving stability and riding quality.
Implementation Method 1
The sensor module may have a light source installed at a side portion thereof, the light source illuminating the inner surface of the tire contacting the road
Implementation Method 2
The sensor is a camera sensor. The inner surface of the tire is provided with a pattern, and the sensor senses the pattern
Implementation Method 3
The intelligent tire system may further include a first magnetic substance installed in the sensor module, and a second magnetic substance installed on a car body positioned over the first magnetic substance and limiting a rotation of the first magnetic substance by magnetic force therebetween
Data Source
AI summary
An intelligent tire system may include a bearing assembly enclosing a wheel rim and a sensor module installed to be relatively rotated with respect to the wheel rim by the bearing assembly and continuously sensing an inner surface of a tire contacting a road.