Fuel Cell Vehicle Control for Resin Liner Buckling Prevention
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Solution Overview
Problem
Fuel cell vehicles equipped with high pressure hydrogen tanks face the challenge of resin liner deformation due to fuel gas permeation, leading to potential buckling and rapid power decrease, which existing control methods fail to adequately address.
Innovation Solution
A method of controlling fuel cell vehicles that involves measuring gas pressure in the high pressure tank and adjusting travel modes to limit fuel release and motor power usage, utilizing both fuel cell and energy storage device electrical energy to maintain optimal performance and prevent liner deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the fuel cell vehicle uses mainly electrical energy from the fuel cell during travel, then the energy storage device can be charged and energy efficiency is improved, but when gas pressure decreases to output limit start threshold pressure, rapid power decrease occurs due to buckling of the resin liner
Solution Approach 1:
The control device performs preliminary action by detecting gas pressure and identifying when it reaches the output limit start threshold pressure before buckling occurs. At this point, the control device pre-limits the amount of fuel released from the high pressure tank and pre-limits the travel driving force, preventing the rapid power decrease that would occur if buckling were allowed to happen. This preliminary intervention maintains power stability while still allowing efficient energy usage up to the threshold point.
Solution Approach 2:
The control device implements feedback by continuously monitoring gas pressure in the high pressure tank and using this information to dynamically adjust the amount of fuel released and the travel driving force. When gas pressure reaches the output limit start threshold pressure, the feedback loop triggers limitations on fuel release and driving force to prevent buckling and rapid power decrease. This closed-loop control ensures reliable power delivery while maintaining energy efficiency during normal operation.
2Reliability
If the amount of fuel released from the high pressure tank is limited to prevent buckling, then the resin liner deformation is prevented, but the travel driving force of the fuel cell vehicle decreases
Solution Approach 1:
The control device applies parameter changes by adjusting the travel driving force parameter when gas pressure reaches the output limit start threshold pressure. Specifically, it limits the travel driving force to a required limit value that is lower than the maximum available driving force. This parameter adjustment prevents buckling of the resin liner while maintaining sufficient driving force for safe and reliable vehicle operation under reduced power conditions.
Solution Approach 2:
The system implements dynamics by making the fuel release amount and travel driving force limits variable based on gas pressure conditions. Instead of fixed limitations, the control device dynamically adjusts these parameters according to real-time gas pressure measurements. When gas pressure is above the threshold, normal fuel release and driving force are allowed; when gas pressure reaches the threshold, limitations are applied to prevent buckling while maintaining required vehicle performance.
3Reliability
If the travel driving force is limited to a required limit, then the power decrease is suppressed, but the vehicle performance is reduced
Solution Approach 1:
The control device applies preliminary anti-action by implementing limitations on travel driving force before rapid power decrease occurs. When gas pressure reaches the output limit start threshold pressure, the control device proactively limits the travel driving force to the required limit, preventing the buckling-induced rapid power decrease. This preliminary restriction maintains power stability and allows the vehicle to continue operating with stable, predictable performance rather than experiencing sudden power loss.
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 method effectively prevents resin liner deformation and suppresses rapid power decrease, ensuring the fuel cell vehicle maintains required performance and commodity quality by managing gas pressure and energy distribution efficiently.
Implementation Method 1
a fuel cell configured to perform power generation by electrochemical reactions of the fuel gas and an oxygen-containing gas
Implementation Method 2
the fuel gas permeates through the resin liner, and the permeated fuel gas is stored in a space between the resin liner and the CFRP layer
Data Source
AI summary
In a fuel cell vehicle and a method of controlling the fuel cell vehicle, when a gas pressure in a high pressure tank becomes less than a first threshold pressure, the SOC of an energy storage device is increased to a margin SOC. When the gas pressure becomes a second threshold pressure which is lower than the first threshold pressure, the amount of fuel released from the high pressure tank is limited to prevent the occurrence of buckling, and limit the travel driving force by the motor to a required limit. At the time of limiting the travel driving force, electrical energy of the energy storage device is used to provide assistance in a manner that the travel driving force by the motor becomes the travel driving force of the required limit.