Sensor Shape Feature for Precise Speed-Detection Alignment
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Solution Overview
Problem
Existing passive sensors used in vehicle speed detection require precise alignment during installation and cannot change orientation during operation, complicating installation and limiting the functionality of active sensors in applications like ABS, ASR, and ESP.
Innovation Solution
A sensor with a predetermined shape feature, such as a rib or depression, allows for easy and permanent alignment through a form-fitting connection with a fastening apparatus, enabling secure and simplified installation and orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If passive sensors are used for speed detection, then the sensor structure is simple, but the alignment precision and functionality are limited
Solution Approach 1:
The sensor body is designed with an asymmetric shape feature (e.g., a rib or depression) that breaks the circular symmetry of the cylindrical sensor housing. This asymmetric feature engages with a corresponding feature in the fastening apparatus to ensure precise and unique alignment of the sensor during installation, eliminating the need for complex alignment procedures while maintaining simple passive sensor structure.
2Adaptability or versatility
If active sensors are used for speed detection with multiple measuring elements, then the functionality and measurement capability are improved, but the alignment complexity and installation difficulty increase
Solution Approach 1:
The asymmetric shape feature on the sensor body provides a simple mechanical guide that directs the sensor into the correct orientation during installation. This allows active sensors with multiple measuring elements to be easily installed without complex alignment procedures, as the asymmetric feature physically guides the sensor to its precise orientation relative to the fastening apparatus.
Solution Approach 2:
The shape feature on the sensor body and the corresponding feature in the fastening apparatus are designed to automatically establish correct alignment during the installation process. The sensor is pre-configured with the alignment feature that engages with the fastening apparatus, ensuring that the measuring elements are automatically oriented correctly without requiring manual adjustment or complex installation procedures.
3Reliability
If the sensor alignment is made permanent and fixed, then the reliability of measurement is improved, but the installation complexity increases
Solution Approach 1:
The asymmetric shape feature creates a unique mechanical engagement between the sensor and fastening apparatus that automatically ensures correct alignment during installation. This simple geometric engagement provides permanent and fixed alignment without requiring complex installation procedures or additional alignment mechanisms, as the asymmetric features physically constrain the sensor in its correct orientation.
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
Facilitates the use of active sensors in vehicle speed detection by simplifying alignment and ensuring consistent signal transfer, allowing for accurate detection of movement direction and enabling diagnostic functions.
Implementation Method 1
the physical variable is a magnetic pulse induced by a movement of an object in the vicinity of the sensor
Implementation Method 2
active sensors have increasingly been used, thus sensors which are activated by application of a supply voltage and generate an output signal
Data Source
AI summary
A sensor for detecting a physical variable in dependence on an alignment of the sensor around an axis of the sensor, including: a sensor body having a predetermined first shape feature on an outer surface of the sensor body for enabling a predetermined alignment of the sensor around the axis. Also described is a related system with the sensor.