Vehicle Fuel Cell Impedance Measurement Device
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Solution Overview
Problem
Current impedance measurement devices for vehicle-mounted hydrogen fuel cells are large, prone to damage, and unsuitable for real-time monitoring due to their size and complexity, failing to effectively manage the operation conditions of fuel cell systems in vehicles, which leads to performance degradation and shortened service life.
Innovation Solution
A device and method for online impedance spectrum measurement using a controllable alternating current source, voltage signal gating circuit, current sensor, signal conditioning and amplifying circuit, multi-channel simultaneous sampling analog-digital conversion circuit, and digital signal processor, which miniaturizes the measurement system and enables real-time monitoring by applying sinusoidal signals and calculating impedance real and imaginary parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If dedicated impedance measuring devices (electrochemical workstation) are used for impedance spectrum measurement, then measurement precision is improved, but device size increases and reliability decreases
Solution Approach 1:
The patent segments the impedance measurement function from the complex electrochemical workstation into a dedicated, simplified measuring device. This segmentation extracts only the essential impedance measurement capability, removing unnecessary components that increase size and reduce reliability, while preserving measurement precision through targeted circuit design.
Solution Approach 2:
The patent extracts the core impedance measurement function from the electrochemical workstation, creating a standalone device that performs only impedance spectrum measurement. This extraction eliminates the bulk and complexity of the original workstation while maintaining measurement accuracy through specialized circuitry designed specifically for impedance applications.
2Measurement precision
If dedicated impedance measuring devices are used, then measurement precision is improved, but measurement time increases
Solution Approach 1:
The patent implements preliminary action by pre-configuring the measuring device with optimized measurement parameters and circuits before actual measurement. The device is designed with built-in signal generation and acquisition capabilities that are pre-calibrated for impedance spectrum measurement, eliminating setup time and enabling immediate measurement upon deployment.
Solution Approach 2:
The patent applies skipping by implementing a streamlined measurement process that bypasses unnecessary intermediate steps. The integrated circuit design allows direct signal injection and measurement without requiring complex external equipment setup, enabling rapid impedance spectrum acquisition while maintaining precision through dedicated measurement pathways.
3Measurement precision
If electrochemical workstation is used for impedance measurement, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the complex electrochemical workstation into a simplified dedicated impedance measuring device that performs only impedance spectrum measurement. This segmentation removes unnecessary functional modules while preserving the core measurement capability, thereby reducing device complexity while maintaining measurement precision through focused circuit design.
Solution Approach 2:
The patent extracts the essential impedance measurement function from the multi-functional electrochemical workstation, creating a dedicated device with simplified architecture. This extraction eliminates complex control systems and additional measurement capabilities that are not needed for impedance spectrum measurement, reducing overall device complexity while maintaining measurement precision through specialized hardware.
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
The solution miniaturizes and enhances the reliability of impedance spectrum measuring devices, allows for real-time monitoring of fuel cell health, and provides accurate impedance data for early fault detection, improving control accuracy and extending the service life of fuel cell systems.
Implementation Method 1
a controllable alternating current source, connected to two ends of the fuel cell and configured to apply a sinusoidal alternating signal
Implementation Method 2
a cell voltage signal preceding-stage measuring circuit, connected, by the voltage signal gating circuit, to two ends of each monocell of the fuel cell, and configured to select, by the voltage signal gating circuit, to communicate with one monocell
Implementation Method 3
a current sensor and a cell current signal preceding-stage measuring circuit connected with the current sensor, wherein the current sensor is connected to an output DC bus of the fuel cell and configured to measure outuput DC bus current of the fuel cell
Implementation Method 4
a signal conditioning and amplifying circuit, a multi-channel simultaneous sampling analog-digital conversion circuit, a digital signal processor and an upper computer, which are connected in sequence, wherein the signal conditioning and amplifying circuit is connected to the cell voltage signal preceding-stage measuring circuit and the cell current signal preceding-stage measuring circuit, separately
Data Source
AI summary
An online impedance spectrum measuring device and method for a vehicle-mounted hydrogen fuel cell includes: a controllable alternating current source, configured to apply a sinusoidal alternating signal; a cell voltage signal preceding-stage measuring circuit, configured to select to communicate with one monocell via a voltage signal gating circuit; a current sensor and a cell current signal preceding-stage measuring circuit connected with the current sensor; and a signal conditioning and amplifying circuit, a multi-channel simultaneous sampling analog-digital conversion circuit, a digital signal processor and an upper computer, which are connected in sequence, wherein the signal conditioning and amplifying circuit is connected to the cell voltage signal preceding-stage measuring circuit and the cell current signal preceding-stage measuring circuit, separately; and the upper computer is connected with the controllable alternating source and the voltage signal gating circuit.