Fuel Cell Air Pump Segmentation for Compressor Power Reduction
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Solution Overview
Problem
Fuel cell stacks in vehicles often operate inefficiently during low-power idling periods, with the air compressor consuming excess power when both supplying air to the fuel cell stack and levitating the bearing, leading to reduced power usage efficiency.
Innovation Solution
Incorporating an air pump that operates at a lower voltage than the air compressor, allowing the air compressor to be shut off during low-power modes and the air pump to supply air to the fuel cell stack, thereby reducing power consumption and increasing efficiency by minimizing unnecessary air flow during idling and high-power operating modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the air compressor operates during low-power idling modes, then air supply to the fuel cell stack is maintained, but power consumption increases excessively
Solution Approach 1:
The air supply function is segmented between two devices: the air compressor handles high-power modes while the air pump handles low-power idling modes. This segmentation allows each device to operate in its optimal efficiency range, preventing the air compressor from consuming excessive power during low-power modes while ensuring continuous air supply to the fuel cell stack.
Solution Approach 2:
The air pump serves as an intermediary device that takes over the air supply function during low-power idling modes when the air compressor is shut off. This intermediary solution resolves the contradiction by providing the necessary air supply without the excessive power consumption of the air compressor, while a valve system coordinates the switching between the two devices.
2Use of energy by moving object
If the air compressor is shut off during low-power modes, then power consumption is reduced, but air supply to the fuel cell stack may be insufficient
Solution Approach 1:
The air supply responsibility is segmented between the air compressor and air pump based on operating conditions. During low-power modes, the air pump is activated to provide sufficient air supply to the fuel cell stack, ensuring reliability is maintained even when the air compressor is shut off. The segmentation allows the smaller air pump to handle low-power requirements efficiently.
Solution Approach 2:
The air pump acts as an intermediary that ensures continuous air supply to the fuel cell stack when the air compressor is off.配合 the valve system, it guarantees that the fuel cell stack receives adequate air during low-power modes, resolving the reliability concern while achieving power consumption reduction.
3Adaptability or versatility
If the air compressor supplies air to both the fuel cell stack and the bearing, then both functions are fulfilled, but overall system efficiency decreases
Solution Approach 1:
The air supply functions are segmented: the air compressor is dedicated to supplying air to the fuel cell stack during high-power modes, while the air pump is dedicated to supplying air to the bearing during compressor operation and to the fuel cell stack during low-power modes. This segmentation eliminates the inefficiency of the air compressor supplying both functions simultaneously, as each device operates in its optimal efficiency range for its assigned function.
Solution Approach 2:
The air pump serves as an intermediary that handles the bearing air supply during compressor operation, allowing the air compressor to focus solely on fuel cell stack air supply during high-power modes. This intermediary arrangement optimizes the power usage efficiency by preventing the air compressor from operating inefficiently while performing dual functions.
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 air pump enhances power usage efficiency by reducing the air compressor's power consumption during low-power modes and optimizing air flow, resulting in improved fuel cell assembly efficiency across various power levels.
Implementation Method 1
The air compressor includes a bearing configured to be levitated via air
Data Source
AI summary
A fuel cell assembly includes a fuel cell stack. A vehicle includes a propulsion system and the fuel cell assembly configured to provide power to the propulsion system in at least one mode. The fuel cell assembly also includes an air compressor and an air pump spaced from the air compressor. The air compressor includes an on position in which the air compressor is configured to supply air to the fuel cell stack and an off position in which the air compressor does not supply air to the fuel cell stack. The air compressor also includes a bearing configured to be levitated via air. The air pump is configured to supply air to the fuel cell stack when the air compressor is in the off position and configured to supply air to the bearing when the air compressor is in the on position.