Tire Tread Depth Sensor Using Inversion and Piezoelectric Deformation
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Solution Overview
Problem
Existing methods for measuring tire tread depth during vehicle operation are unreliable and disruptive, especially when near the tread, and do not provide continuous monitoring, which can lead to increased braking distances and aquaplaning risks in wet conditions.
Innovation Solution
A device with sensor elements mounted on the inner side of the tire opposite the tread, which measure deformation characteristics of the tire contact area, allowing for continuous and reliable tread depth determination using a control and evaluation unit, and can be integrated with existing tire pressure measurement systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensors are arranged very close to the tread to measure tread depth during operation, then measurement reliability is improved, but the sensor becomes disruptive when changing a wheel
Solution Approach 1:
The sensor element is inverted from the conventional position outside the tread to inside the tire, specifically on the inner side of the tire in a region opposite the tread. This inversion allows the sensor to measure tread depth during operation without being disruptive when changing wheels, as it is integrated within the tire structure rather than mounted externally near the tread surface.
2Device complexity
If visual detection methods using transverse webs are used, then tread depth detection is simple, but it can only be detected visually from the outside at the vehicle and not continuously during operation
Solution Approach 1:
The mechanical visual detection system using transverse webs is replaced with an electronic sensor element that continuously measures tread depth during vehicle operation. The sensor element detects mechanical deformation of the tire and converts it into electrical signals that are processed by a control unit, providing continuous digital monitoring rather than intermittent visual inspection.
3Reliability
If sensor elements are permanently mounted on the inner side of the tire, then continuous tread depth measurement during travel is achieved, but the device complexity increases
Solution Approach 1:
The sensor element and control unit are designed to perform multiple functions: they measure tread depth by detecting tire deformation, and can be integrated with existing tire pressure measurement systems. This multi-functionality reduces overall system complexity by sharing components and infrastructure rather than creating entirely separate measurement systems.
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
Ensures a simple, cost-effective, and reliable display of instantaneous tread depth, enabling timely tire replacement and reducing the risk of accidents due to low tread depth, while also providing data on tire wear and other parameters.
Implementation Method 1
at least one sensor element (10) which is designed to acquire data relating to a change in the deformation characteristic of the motor vehicle tire in the region of the tire contact area
Implementation Method 2
the sensor element is embodied as a planar piezoelement or as a planar strain gauge
Data Source
AI summary
A device and a method for measuring the tread depth of a motor vehicle tire. The device includes at least one sensor element which is configured to acquire data on a change of the deformation characteristics of the motor vehicle tire in the area of the tire contact area and can be fixed in the area of the inner side of the motor vehicle tire opposite the tread; and a control and evaluation unit for evaluating and processing the acquired data. The unit is data-connected to the at least one sensor element.