Capacitive Coupling Clip for Non-Contact CAN Bus Data Recovery
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Solution Overview
Problem
Current solutions for reading CAN network data in vehicles require physical contact or modifications, leading to integrity issues, obstruction, and compatibility problems with varying speeds and technologies, with existing inductive coupling methods being bulky, unstable, and not universally compatible.
Innovation Solution
A capacitive coupling device with a connection clip and electronic circuit that amplifies, processes, and regenerates CAN data without direct contact, using differential measurements to improve noise immunity and compatibility across all CAN technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inductive coupling is used to connect to the CAN network, then physical integrity of the network is preserved, but the device becomes bulky and installation is complicated
Solution Approach 1:
The patent replaces the mechanical inductive coupling system with a capacitive coupling system. The connection clip uses a capacitive element that couples to the CAN bus lines through capacitance formed by the clip's conductive parts and the bus lines, eliminating the need for bulky inductive coils while maintaining non-contact connection and network integrity.
2Reliability
If inductive coupling is used, then network integrity is maintained, but the connection becomes unstable over time
Solution Approach 1:
The patent substitutes the inductive coupling mechanism with capacitive coupling, where the connection clip forms a capacitive interface with the CAN bus lines. This capacitive coupling provides stable electrical connection over time by maintaining consistent capacitance values, eliminating the drift and instability issues inherent in inductive coupling systems.
3Loss of information
If inductive coupling is used, then data can be read from the network, but current fluctuations cause misinterpretation of information
Solution Approach 1:
The patent replaces inductive coupling with capacitive coupling to read data from the CAN network. The capacitive coupling mechanism directly couples to the voltage signals on the bus lines, providing accurate voltage measurements that are not susceptible to the current fluctuation issues affecting inductive coupling, thereby improving signal accuracy and reducing misinterpretation.
4Reliability
If inductive coupling is used, then connection to the network is achieved, but compatibility with different CAN speeds and technologies is limited
Solution Approach 1:
The patent designs a universal connection clip with capacitive coupling that can interface with different CAN bus technologies (CAN 2.0, CAN FD, FlexRay) and speed variations. The capacitive coupling mechanism inherently adapts to different signal characteristics without requiring multiple specialized clips, providing broad compatibility across CAN protocols and implementations.
5Loss of information
If direct contact connection is used, then data reading is possible, but the network's physical integrity is compromised
Solution Approach 1:
The patent introduces a connection clip as an intermediary device that provides capacitive coupling between the diagnostic equipment and the CAN bus lines. This intermediary enables data reading without direct electrical contact, preserving the network's physical integrity while allowing full data access through the capacitive interface.
6Loss of information
If splices are made on the wiring harness, then data can be captured, but installation complexity increases and network integrity is affected
Solution Approach 1:
The patent uses a connection clip with capacitive coupling as an intermediary that attaches to the exterior of the wiring harness without requiring splices or modifications. This non-intrusive approach captures data while keeping installation simple and preserving network integrity, eliminating the complexity of wiring modifications.
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 stable and universal connection to CAN networks without modifying the network's integrity, ensuring high message coverage and compatibility with various speeds and technologies, reducing installation complexity and noise interference.
Implementation Method 1
The device includes connection means for connecting to multiplexed networks without a wire connection configured to recover the signals transmitted on the digital data bus. According to a supplementary characteristic, the connection means include at least one connection clip without direct electrical contact, which is a capacitive type clip.
Implementation Method 2
an electronic circuit, analyzes and processes the signals received after having amplified them and makes it possible to regenerate the data of the communication bus in the desired format.
Implementation Method 3
the clip of the device of the invention is put on two wire of the CAN network and thus carries out a differential measurement, which improves immunity from noise compared to a clip, which although functional would be connected on only one line of the communication bus.
Data Source
AI summary
A device for reading information recovers signals exchanged on a digital data communications bus (4a, 4b) and processes these signals clips (5a, 5b) connect to multiplexed networks without a wire (galvanic) connection yet are configured for recovering the signals transmitted on the digital data communications bus.