Vehicle Frame Voltage Monitoring Through Frequency Separation
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Solution Overview
Problem
Existing methods fail to provide rapid, precise, and grid-independent monitoring of electrical potential between a vehicle frame and grounding, especially in electric vehicles, risking user safety due to potential hazardous situations when connected to power grids with varying characteristics.
Innovation Solution
A method involving frequency-based signal filtering and analysis of voltage components at different frequency ranges (low, grid, and high frequencies) to assess potential hazards, generating a warning signal when threshold values are exceeded, and adapting to grid-specific characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional voltage monitoring methods are used, then the system is simple to implement, but it cannot provide rapid, precise, and grid-independent monitoring due to fluctuations in grid characteristics
Solution Approach 1:
The voltage signal is segmented into three distinct frequency components (low-frequency, grid frequency, and high-frequency) through filtering. Each component is analyzed separately to determine hazardous conditions, enabling precise monitoring while maintaining system manageability through modular signal processing
Solution Approach 2:
The system applies partial action by selectively monitoring only the frequency components that indicate hazardous conditions. Rather than analyzing the entire voltage spectrum, the method focuses on specific frequency ranges that are most indicative of dangerous insulation failures, improving precision without excessive complexity
2Measurement precision
If frequency-based signal filtering is applied to separate voltage components, then measurement precision and accuracy improve, but device complexity increases
Solution Approach 1:
The signal processing system is divided into three independent filtering paths, each handling a specific frequency range. This segmentation allows precise discrimination of voltage components while keeping each filter design relatively simple and manageable
Solution Approach 2:
The filtering system serves multiple functions simultaneously: it separates frequency components, identifies hazardous conditions, and provides the basis for warning signal generation. This multi-functionality reduces the need for additional separate systems, balancing precision with complexity
3Adaptability or versatility
If the monitoring system accounts for grid frequency fluctuations and characteristics, then adaptability improves, but the complexity of the monitoring methodology increases
Solution Approach 1:
The monitoring system dynamically adapts to grid frequency fluctuations by continuously filtering and analyzing the voltage signal at the actual grid frequency. The system adjusts its analysis based on the measured frequency components, enabling it to handle varying grid characteristics without requiring a completely different methodology for each scenario
Solution Approach 2:
The system changes its analysis parameters based on the detected frequency components. By monitoring the amplitude and frequency of voltage fluctuations across different frequency ranges, the system adapts to different grid conditions and characteristics, maintaining accuracy across varying operational environments
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
Accurately identifies and alerts users to potentially hazardous situations by separating voltage components, reducing false alarms, and ensuring safety by disconnecting the vehicle from the power grid when necessary.
Implementation Method 1
The first signal is filtered in a filtering band comprising and preferably centred on the grid frequency generating: a low frequency component comprising contributions to the first signal in a frequency range below the grid frequency; a grid frequency component comprising the contributions to the first signal in a frequency range around the grid frequency; a high-frequency component comprising contributions to the first signal in a frequency range above the grid frequency.
Data Source
AI summary
This invention relates to a method for monitoring a voltage value on a vehicle frame when connected to a power grid. The method is performed by acquiring signals representing the voltage values between respective terminals connected to the nodes of the power grid and the vehicle frame. The signals are filtered so as to split their components at the grid frequency of the power grid with respect to those at lower or higher frequency ranges. The components in the three ranges identified are analysed separately and if one of their representative values exceeds respective, predetermined threshold values, a warning signal is generated.