Fuel Cell Vehicle Pre-Stop Drying Control
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Solution Overview
Problem
Conventional fuel cell vehicles require a post-stop drying process that prolongs the operation of the air pump, causing discomfort and reducing marketability due to continuous noise after the vehicle is stopped.
Innovation Solution
Implementing a method to predict the stop state of the fuel cell system during travel and initiating a pre-stop drying process, transitioning the fuel cell stack to a dry state a predetermined time before the predicted stop, thereby eliminating or reducing the need for post-stop power generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a post-stop drying process is performed to transition the fuel cell stack to a dry state after stopping, then the durability and power generation stability are improved, but the air pump continues to operate for a certain period causing noise and reducing marketability
Solution Approach 1:
The patent applies preliminary action by transitioning the fuel cell stack to a dry state before the vehicle stops. The control unit performs drying control during the stopping prediction period, using the air pump to supply干燥 gas to the fuel cell stack and remove moisture, so that the drying process is completed before the vehicle actually stops, eliminating the need for post-stop drying operation
2Stability of the object's composition
If the air pump is operated continuously during post-stop drying to remove moisture from the fuel cell stack, then the moisture state transitions to dry state, but the operation time is prolonged causing discomfort to occupants
Solution Approach 1:
The control unit predicts the stopping time and initiates drying control before the vehicle stops. By performing the moisture removal process in advance during the stopping prediction period, the fuel cell stack transitions to a dry state before the vehicle actually stops, significantly reducing or eliminating the air pump operation time after stopping
3Loss of time
If pre-stop drying control is implemented to transition to dry state before stopping, then post-stop drying time is eliminated or reduced, but stop prediction accuracy is required
Solution Approach 1:
The control unit uses feedback from the stopping prediction unit to determine when to switch to drying control mode. The system continuously monitors vehicle operating conditions and uses the predicted stopping information to timing the drying process, ensuring that drying is performed at the optimal time before stopping without requiring excessive prediction accuracy
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 eliminates or significantly reduces the post-stop drying time, preventing air pump noise and enhancing the marketability of fuel cell vehicles by ensuring a quicker transition to a dry state.
Implementation Method 1
the power generation cells generating electric power by an electrochemical reaction of a fuel gas and an oxygen-containing gas
Implementation Method 2
a drying state control that causes the fuel cell stack to transition to a dry state
Data Source
AI summary
When a time point of occurrence of a stop state of a fuel cell system is predicted during traveling, a drying state control that causes a fuel cell stack to transition to a dry state is started a predetermined time (a required drying time) before the predicted time point of occurrence of the stop state.