Fuel Cell Hydrogen Pressure Estimator
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional fuel cell systems estimate gas parameters at a single point, leading to inaccuracies and failure to account for gas permeation and water vapor in interconnected components, resulting in inefficient gas control and estimation variability.
Innovation Solution
A control system with an electronic control unit connected to multiple components, including actuators, determines initial and previous values of flowrates, pressures, concentrations, and temperatures to estimate total and partial pressures, controlling actuators like injectors, hydrogen pumps, and purge valves to maintain a precise ratio of hydrogen gas to hydrogen consumed, ensuring efficient gas flow and water balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional single-point gas parameter estimation is used, then the control system is simple, but the estimation accuracy deteriorates due to not accounting for gas permeation and water vapor in interconnected components
Solution Approach 1:
The patent divides the fuel cell system into multiple discrete components (fuel cell stack, interconnectors, manifolds, etc.), each with its own gas balance equations. This segmentation allows the system to account for gas permeation and water vapor in each component individually, significantly improving estimation accuracy without requiring additional hardware sensors.
Solution Approach 2:
The electronic control unit performs multiple functions: it estimates gas parameters, tracks water balance, monitors pressure conditions, and controls actuators. By making the ECU multi-functional, the system improves measurement precision through comprehensive monitoring without adding separate dedicated devices for each function.
2Loss of information
If component-specific gas estimation is used, then the control approach is simple, but the system cannot determine water or other gases within other components
Solution Approach 1:
The patent transitions from single-point (one-dimensional) gas parameter estimation to multi-component (multi-dimensional) estimation by establishing gas balance equations for each component in the system. This dimensional expansion allows the system to track water and gas distribution across all components simultaneously, eliminating information loss without requiring additional physical sensors in each component.
3Reliability
If legacy controller with single-point estimation is used, then hardware requirements are minimal, but estimation variability is significant
Solution Approach 1:
The system implements feedback mechanisms where the ECU continuously monitors gas parameters, water balance, and pressure conditions across multiple components, then adjusts actuator positions accordingly. This feedback loop reduces estimation variability by constantly comparing actual system state with model predictions and making real-time corrections, thereby improving reliability without requiring more complex hardware.
Data Source
AI summary
Methods, systems, and devices of a control system for gas flow. The control system controls gas flow through a fuel cell stack of a vehicle. The control system includes two or more components including one or more actuators and a fuel cell. The control system includes an electronic control unit connected to the two or more components. The control system is configured to determine initial values and previous timestep values. The control system is configured to determine or estimate a total pressure of the gas flow in each of the two or more components based on the initial values and the previous timestep values. The control system is configured to control the one or more actuators based on the total pressure of the gas flow in each of the two or more components.