Fuel Cell Air Duct Bypass for Inertia Wind Control
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Solution Overview
Problem
Fuel cell stacks in vehicles malfunction due to vehicle-induced wind entering the air duct and causing unnecessary power generation and durability issues when traveling by inertia, and existing air shut-off devices delay air supply during condition changes.
Innovation Solution
An air inlet/outlet flow path in the air duct allows selective entry or exit based on fuel cell stack operation, bypassing the outflow path to prevent malfunction and ensure quick air supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an air shut-off device is used to prevent vehicle-induced wind from entering the air duct during inertia traveling, then malfunction of the fuel cell stack is prevented, but air supply is delayed when traveling conditions change to normal operation
Solution Approach 1:
The patent extracts the harmful vehicle-induced wind from the air duct system by providing a separate exhaust path for wind that enters the air duct during inertia traveling. The wind can be discharged through the exhaust flow path without affecting the fuel cell stack operation, while air supply to the fuel cell stack remains uninterrupted when needed.
Solution Approach 2:
The air duct system is segmented into multiple independent flow paths: a fresh air flow path for supplying air to the fuel cell stack, and an exhaust flow path for discharging vehicle-induced wind. This segmentation allows simultaneous handling of different air flows without mutual interference, resolving the contradiction between preventing malfunction and ensuring quick air supply.
2Reliability
If the fuel cell stack operates continuously to ensure power availability, then power supply reliability is improved, but durability and efficiency deteriorate during inertia traveling when power generation is unnecessary
Solution Approach 1:
The system uses feedback from the vehicle's traveling condition detection to control the air supply device. When inertia traveling is detected (motor not operating), the system automatically stops air supply to the fuel cell stack, preventing unnecessary operation. When normal traveling condition is detected (motor operating), air supply resumes automatically, ensuring power availability. This feedback-based control resolves the contradiction between continuous operation reliability and operational durability.
Data Source
AI summary
Provided is a fuel cell system for a vehicle, the fuel cell system including a fuel cell stack provided in a vehicle, an air duct including an air inflow path through which air is introduced, and an air outflow path through which the air is discharged to the fuel cell stack, and an air inlet/outlet flow path having one end connected to the air duct and the other end exposed to the outside of the air duct, the air inlet/outlet flow path being configured to allow the air to selectively enter or exit the air duct depending on an operation of the fuel cell stack, thereby obtaining an advantageous effect of improving safety, reliability, operational efficiency, and durability by inhibiting unnecessary surplus power generation of the fuel cell stack.