Vehicle Electrical System EMI Detection via Injected Test Signals
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Solution Overview
Problem
Existing methods for verifying electromagnetic compatibility (EMC) in motor vehicles are inefficient and do not allow for direct detection of interference emissions from the vehicle's electrical system, complicating troubleshooting and optimization.
Innovation Solution
A method and arrangement that involves generating an interference signal using a signal generator, injecting it into the vehicle's electrical system, and using a test antenna and receiving device to detect frequency-resolved measurement signals, allowing direct determination of interference emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If individual component testing according to CISPR standards is performed, then electromagnetic compatibility verification is achieved, but the complexity and time required for EMC verification increases significantly
Solution Approach 1:
The patent segments the EMC verification process into two distinct phases: (1) individual component testing according to CISPR standards, and (2) integrated system testing after installation. This segmentation allows each phase to address specific verification needs independently, reducing the overall complexity by breaking down the comprehensive EMC verification into manageable segments rather than attempting to verify the entire system at once.
Solution Approach 2:
The patent applies preliminary action by performing individual component testing and approval before integration into the vehicle. Components are pre-verified for electromagnetic compatibility according to CISPR standards, which establishes a foundation of known-good components. This preliminary verification reduces the complexity of subsequent system-level testing, as the baseline electromagnetic behavior of individual components is already characterized and approved.
2Reliability
If components are tested individually before integration, then component-level EMC compliance is ensured, but direct detection of interference emissions from the integrated electrical system is not possible
Solution Approach 1:
The patent introduces an intermediary measurement system that couples to the vehicle's electrical system through existing communication buses (CAN, LIN, FlexRay). This intermediary approach allows indirect measurement of electromagnetic interference emissions without requiring direct physical access to all electrical components. The measurement system acts as a mediator that translates complex system-level electromagnetic behavior into detectable signals, enabling post-integration EMC verification while maintaining the benefits of component-level pre-testing.
3Productivity
If multiple data lines are tested simultaneously, then testing efficiency is improved, but the complexity of the testing device increases
Solution Approach 1:
The patent implements multi-functionality by designing a single testing device that can handle multiple data lines and different communication protocols (CAN, LIN, FlexRay) simultaneously. The device incorporates universal measurement capabilities that adapt to different bus types through software configuration rather than requiring separate hardware for each protocol. This universal approach enables parallel testing of multiple data lines without proportionally increasing device complexity, as the same core measurement infrastructure serves multiple functions.
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 direct detection of electromagnetic interference, simplifying troubleshooting and optimization of the vehicle's electrical system for EMC compliance by identifying specific frequencies or frequency ranges exceeding permissible limits.
Implementation Method 1
a test antenna (6) and a receiving device (4) are used to detect frequency-resolved measurement signals
Data Source
Figure 1
Figure 2~3
AI summary
The invention relates to a method for detecting electromagnetic interference caused by an on-board electrical system (51) of a motor vehicle (50). An interference signal (10) is provided by a signal generator (3) and is fed to the on-board electrical system (51) by a connection means (5), wherein a frequency-resolved measurement signal (13, 38, 39) is detected by a test antenna (6) and a receiving device (4), and the detected frequency-resolved measurement signal (13, 38, 39) is provided and output by the receiving device (4). The invention additionally relates to an assembly (1) for detecting electromagnetic interference caused by an on-board electrical system (51) of a motor vehicle (50).