Fuel Cell Coolant Valve Control for Ion Filter Durability
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Solution Overview
Problem
The durability of ion filters in fuel cell thermal management systems is compromised due to excessive coolant flow, leading to increased conductivity issues, necessitating a controlled flow path to maintain filter integrity and prevent conductivity rises.
Innovation Solution
A control system for a flow control valve is implemented, with specific port configurations and opening strategies to manage coolant flow rates, ensuring the ion filter is only partially opened within a predetermined temperature control section, limiting coolant flow to less than 50% of the maximum flow rate from the radiator, thereby enhancing ion filter durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If coolant flows through the ion filter in the cooling loop, then the ion filter can be cooled, but the durability of the ion filter deteriorates due to excessive flow
Solution Approach 1:
The patent applies partial action by controlling the flow control valve to allow only a portion of the coolant to pass through the ion filter, specifically limiting it to less than 50% of the maximum flow rate. This partial flow is sufficient to prevent conductivity increase while avoiding excessive flow that would damage the ion filter durability.
Solution Approach 2:
The patent changes the flow rate parameter of coolant passing through the ion filter by using a flow control valve with adjustable opening amounts. The controller dynamically adjusts the valve opening to maintain coolant flow within a specific range (less than 50% of maximum) to balance cooling needs with filter protection.
2Reliability
If coolant does not flow into the ion filter, then the ion filter durability is preserved, but the conductivity of the coolant increases
Solution Approach 1:
The patent applies partial action by ensuring that a minimum level of coolant flow (less than 50% of maximum flow rate) is maintained through the ion filter. This partial flow is sufficient to prevent conductivity increase while avoiding excessive flow that would damage the filter.
Solution Approach 2:
The controller monitors coolant flow conditions and adjusts the flow control valve opening amount dynamically to maintain appropriate flow levels through the ion filter, preventing both excessive flow damage and insufficient flow that would increase conductivity.
3Productivity
If the flow control valve is fully opened to maximize coolant flow, then cooling efficiency is improved, but the ion filter durability deteriorates
Solution Approach 1:
The patent changes the flow rate parameter by controlling the flow control valve opening amount to a specific range (less than 50% of maximum opening). This parameter adjustment optimizes the balance between cooling efficiency and ion filter protection, preventing excessive flow damage while maintaining adequate cooling.
Solution Approach 2:
The patent applies partial action by using only a portion of the maximum available coolant flow (less than 50% of maximum) through the ion filter path. This partial flow provides sufficient cooling and conductivity control while protecting the filter from the damaging effects of full-flow conditions.
Data Source
AI summary
A control system includes a flow control valve for control of a coolant flow path and a controller configured for control of an opening amount of the flow control valve. The flow control valve includes ports respectively communicating with a fuel cell stack, a radiator, a coolant pump, and an ion filter. The controller is configured to control the flow control valve to open a first port connected to the ion filter within a predetermined section in a temperature control section of a fuel cell thermal management system. The temperature control section is a section between a point where the second port connected to the radiator is completely closed and the third port connected to the fuel cell stack is completely opened and a point where the second port connected to the radiator is completely opened and the third port connected to the fuel cell stack is completely closed.