Fuel Gas Detector Burping Condition Control
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Solution Overview
Problem
In fuel cell vehicles, it is challenging to distinguish between permeated hydrogen gas and leaked hydrogen gas, leading to potential interruptions in fuel filling and vehicle operation, as the detection of permeated gas can erroneously trigger the cessation of hydrogen supply.
Innovation Solution
A method involving a fuel gas detector, pressure measuring unit, time measuring unit, and burping occurrence condition determining unit is implemented to differentiate between permeated and leaked hydrogen gas during filling, preventing erroneous detection and ensuring continuous filling and vehicle operation by controlling the detection of permeated gas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hydrogen gas detector is used to detect leaked hydrogen gas, then safety is improved, but false detection of permeated hydrogen gas causes interruption of filling operation
Solution Approach 1:
The system performs preliminary actions by measuring pressure changes and calculating gas pressure decrease speed before filling operation begins. The burping occurrence condition determining unit pre-assesses the likelihood of permeated hydrogen discharge based on pressure decrease patterns, allowing the system to prepare appropriate responses in advance and prevent false detection interruptions.
Solution Approach 2:
The invention introduces an intermediary assessment mechanism (burping occurrence condition determining unit) that mediates between the hydrogen gas detector and the filling control system. This intermediary analyzes pressure decrease speed and burping conditions to distinguish between permeated hydrogen (normal) and leaked hydrogen (abnormal), preventing false detection from interrupting filling operations while maintaining safety.
2Measurement precision
If the hydrogen gas detector detects any hydrogen gas in the container chamber, then potential leaks are identified, but permeated hydrogen gas discharge is mistakenly identified as a leak
Solution Approach 1:
The system dynamically assesses detection reliability based on real-time pressure decrease speed and burping occurrence conditions. Rather than using a static detection threshold, the hydrogen gas detector's reliability is adjusted dynamically according to whether burping conditions are met, allowing the system to distinguish between permeated hydrogen (low reliability context) and leaked hydrogen (high reliability context).
Solution Approach 2:
The invention changes the detection parameter context by incorporating pressure decrease speed and burping occurrence conditions into the detection logic. When burping conditions are satisfied, the system recognizes that hydrogen detection is likely due to permeation rather than leakage, effectively changing the interpretation parameter from simple presence/absence to context-aware detection.
3Strength
If the relief valve discharges permeated hydrogen gas to the container chamber, then inner layer stress is relieved, but the discharged gas is detected as a leak
Solution Approach 1:
The invention converts the harmful effect of permeated hydrogen discharge (false leak detection) into a beneficial assessment parameter. By monitoring pressure decrease speed and burping occurrence conditions, the system uses the discharged permeated hydrogen as information to distinguish normal stress relief from actual leaks, transforming what was previously a harmful false alarm into a useful diagnostic indicator.
Solution Approach 2:
The system implements feedback by continuously monitoring pressure changes and using this information to adjust leak detection decisions. The pressure measuring unit provides feedback on gas pressure decrease speed, and the burping occurrence condition determining unit uses this feedback to assess whether hydrogen detection is due to normal permeation or actual leakage, enabling the system to adapt its detection behavior based on real-time conditions.
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
This approach prevents interruptions in fuel filling and vehicle operation by accurately distinguishing between permeated and leaked hydrogen gas, allowing for uninterrupted hydrogen supply even when permeated gas is discharged, thus eliminating concerns about vehicle start-up issues.
Implementation Method 1
a pressure measuring/calculating unit configured to measure fuel gas pressure in the in-vehicle fuel gas container and determining gas pressure decrease speed from the measurement result
Implementation Method 2
A container chamber is provided with a hydrogen gas detector. When a hydrogen gas is leaked from a fuel gas container, the hydrogen gas detector detects the leaked hydrogen gas.
Implementation Method 3
a time measuring unit configured to measure elapsed time after the fuel gas pressure reaches a predetermined lower limit value
Implementation Method 4
the phenomenon where the permeated hydrogen gas is discharged in this manner is sometimes called 'burping'
Data Source
AI summary
Decrease speed (gas pressure decrease speed) of fuel gas pressure in an in-vehicle fuel gas container and elapsed time after the fuel gas pressure reaches a predetermined lower limit value are measured. Then, based on the gas pressure decrease speed and the elapsed time, it is determined whether or not a burping occurrence condition where a fuel gas which entered space between an inner layer and an outer layer of the in-vehicle fuel gas container is discharged to the outside of the outer layer is satisfied. If the burping occurrence condition is satisfied, at the time of filling the fuel gas in the in-vehicle fuel gas container, control to prevent detection of the fuel gas by the fuel gas detector is performed.