Fuel Cell Turbo Compressor Pressure Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In fuel cell systems equipped with a turbo compressor, increasing the pressure to enhance output on highlands leads to increased compressor load and insufficient output enhancement, unlike in systems with a Roots compressor.
Innovation Solution
A fuel cell system with a turbo compressor that includes a pressure adjusting valve and control unit to reduce pressure when outside air pressure is low and water content is high, increasing the flow rate of cathode gas and preventing rapid drying by controlling the pressure reduction based on temperature and pressure thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If pressure in the fuel cell is increased to enhance output on highlands, then the output of the fuel cell is improved, but the load of the turbo compressor increases
Solution Approach 1:
The patent applies dynamics by making the pressure control strategy adaptive rather than static. The control unit dynamically adjusts the pressure in the fuel cell based on real-time detection of operating conditions (outside air pressure and water amount). When operating on highlands with low outside air pressure and sufficient water, the system dynamically reduces pressure to lower turbo compressor load while maintaining adequate output. This dynamic adjustment resolves the contradiction by allowing the system to optimize both power output and compressor load according to actual operating conditions.
Solution Approach 2:
The patent changes the pressure parameter based on operating conditions. Instead of maintaining a fixed high pressure to maximize output, the system changes the pressure parameter dynamically - reducing it when operating on highlands with low outside air pressure and adequate water content. This parameter change allows the turbo compressor to operate at lower load while still achieving sufficient fuel cell output, thereby resolving the contradiction between power output and compressor load.
2Productivity
If pressure in the fuel cell is increased to enhance output, then the flow rate of cathode gas is improved, but the interior of the fuel cell dries rapidly
Solution Approach 1:
The patent changes the pressure parameter based on water amount conditions. When the water amount in the fuel cell is below a predetermined threshold, the system maintains higher pressure to ensure adequate cathode gas flow rate and productivity. When water amount is sufficient, the system reduces pressure, which slows down the drying process while still maintaining adequate flow rate. This conditional parameter change resolves the contradiction between productivity and preventing drying.
Solution Approach 2:
The patent implements feedback control by continuously monitoring the water amount in the fuel cell and adjusting the pressure accordingly. The control unit receives feedback about water content and uses this information to determine the appropriate pressure level. This feedback mechanism ensures that pressure is maintained high enough to preserve water when needed, but reduced when water is sufficient, thereby resolving the contradiction between maintaining flow rate and preventing rapid drying.
3Use of energy by moving object
If pressure reducing control is performed to lower turbo compressor load, then compressor efficiency is improved, but fuel cell output may be insufficient
Solution Approach 1:
The patent changes the pressure parameter based on outside air pressure conditions. When outside air pressure is low (highland operation), the system reduces the pressure in the fuel cell to improve turbo compressor efficiency and reduce its load. When outside air pressure is normal, the system maintains higher pressure to ensure sufficient fuel cell output. This conditional parameter change resolves the contradiction by optimizing pressure based on environmental conditions.
Solution Approach 2:
The patent applies dynamics by making the pressure control strategy adaptive to outside air pressure conditions. The control unit dynamically adjusts pressure based on real-time detection of outside air pressure and water amount. This dynamic adjustment allows the system to achieve adequate fuel cell output under varying environmental conditions while improving turbo compressor efficiency when operating on highlands, thereby resolving the contradiction between compressor efficiency and fuel cell output.
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 effectively increases the flow rate of cathode gas to the fuel cell, enhancing its output while maintaining compressor efficiency and preventing interior drying, thus addressing the load increase issue associated with turbo compressors.
Implementation Method 1
a turbo compressor that is provided in the cathode gas supply flow passage
Implementation Method 2
a fuel cell that is configured to generate electric power through an electrochemical reaction between anode gas and cathode gas
Implementation Method 3
performing pressure reduction control for increasing a flow rate of the cathode gas supplied to the fuel cell from the turbo compressor, by controlling the pressure adjusting valve such that a pressure in the fuel cell is lower
Data Source
AI summary
A fuel cell system includes a control unit that is configured to perform pressure reduction control for increasing a flow rate of cathode gas supplied to a fuel cell from a turbo compressor, by controlling a pressure adjusting valve such that a pressure in the fuel cell is lower when a pressure reduction condition is fulfilled than when the pressure reduction condition is not fulfilled. The pressure reduction condition is a condition that an outside air pressure determined based on outside air pressure-associated information is lower than an outside air pressure threshold determined in advance and that an amount of water determined based on water amount-associated information is equal to or larger than a water amount threshold determined in advance.