CAN Coupling Harness Orientation Detection for Signal Correction
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Solution Overview
Problem
Telematics systems face challenges in capturing asset data from assets without an interface port or with gateway-blocking mechanisms, limiting the ability to gather complete data sets, especially for assets like industrial equipment that do not follow standard communication protocols or lack necessary sensors and connectivity options.
Innovation Solution
A coupling harness with orientation detection and logic correction capabilities, utilizing capacitive coupling to capture differential voltage signals from CAN bus lines, removes common mode noise, biases signals, and converts them to digital form to determine the clamp's orientation and generate corrected signals, ensuring accurate data interpretation regardless of clamp orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a coupling clamp is used to capture CAN bus signals from assets without standard interface ports, then data capture capability is improved, but signal accuracy deteriorates due to unknown clamp orientation
Solution Approach 1:
The system captures the digital signal, determines clamp orientation based on signal characteristics, and feeds this orientation information back to automatically correct the signal interpretation. This closed-loop feedback mechanism ensures accurate data capture regardless of how the clamp is physically oriented on the CAN bus lines.
Solution Approach 2:
The system changes the interpretation parameters of the captured signal based on the detected clamp orientation. When the orientation is determined, the system adjusts the signal mapping parameters to correctly interpret which signal line corresponds to CAN_H and which to CAN_L, thereby maintaining measurement precision across different physical orientations.
2Device complexity
If the coupling clamp orientation is not detected, then device complexity is reduced, but data interpretation accuracy deteriorates
Solution Approach 1:
The system performs self-diagnosis by automatically detecting the clamp orientation through analyzing the captured signal characteristics. This self-service capability eliminates the need for manual orientation configuration or complex external detection equipment, achieving accurate data interpretation while keeping the device relatively simple.
Solution Approach 2:
The system performs preliminary orientation detection and signal correction before main data processing begins. By determining the clamp orientation in advance and pre-adjusting the signal interpretation parameters, the system ensures accurate data capture without adding complexity to the ongoing data processing operations.
3Device complexity
If common mode noise is not removed from coupled signals, then device complexity is reduced, but signal quality deteriorates
Solution Approach 1:
The system introduces an intermediary signal processing stage between the coupling clamp and the main data processing unit. This intermediary stage performs common mode noise removal and signal biasing, acting as a buffer that improves signal quality without requiring the main processing unit to be more complex.
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 reliable capture and interpretation of CAN bus signals from assets with or without standard interface ports, overcoming gateway-blocking issues and providing accurate data for telematics systems, even in complex industrial settings.
Implementation Method 1
The first signal line and the second signal line are Controller Area Network (CAN) signal lines... Producing the first coupled signal may comprise coupling between a first coupling element in the coupling clamp and the first signal line and producing the second coupled signal may comprise coupling between a second coupling element in the coupling clamp and the second signal line. In some embodiments, the coupling comprises capacitive coupling
Data Source
AI summary
A coupling harness, including a coupling clamp, for capturing a coupled signal from signal lines is provided. The coupling harness has an orientation detector that determines whether the coupled signal needs to be complemented based on an orientation of the coupling clamp relative to the signal lines. A logic corrector complements the coupled signal based on an output of the orientation detector. Advantageously, signals may be coupled correctly from signal lines regardless of the orientation of the coupling clamp.