Shared Fuel Cell Radiator Control to Prevent Coolant Backflow
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Solution Overview
Problem
In fuel cell vehicles with multiple fuel cell stacks sharing a common radiator, backflow can occur due to pressure differentials, leading to inefficient cooling and potential damage to the fuel cells.
Innovation Solution
The method involves determining minimum pump speeds and flow splitting valve openings for the cooling system to prevent backflow. This is achieved by using control maps and mathematical representations of system components, along with state estimation and feedforward/feedback control systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single common radiator is used for multiple fuel cell stacks, then device complexity is reduced, but backflow occurs due to pressure differentials causing unreliable cooling
Solution Approach 1:
The patent implements dynamic control of pump speeds and flow splitting valve positions to prevent backflow. The system continuously adjusts pump speeds and valve openings based on real-time pressure differentials and flow conditions, transforming a static cooling system into a dynamic one that actively responds to changing operational conditions, thereby preventing backflow while maintaining a single common radiator configuration
Solution Approach 2:
The system employs feedback control by monitoring pressure differentials across fuel cell stacks and using this information to adjust pump speeds and valve positions. The control system calculates required pump speeds and valve openings based on measured pressure conditions, creating a closed-loop feedback mechanism that maintains reliable cooling operation and prevents backflow in the shared radiator system
2Reliability
If pump speeds are increased to prevent backflow, then cooling reliability improves, but energy consumption increases
Solution Approach 1:
The system optimizes pump energy consumption by dynamically adjusting pump speed parameters based on actual cooling demands and pressure conditions. Rather than operating pumps at constant high speeds, the control system calculates minimum required pump speeds to prevent backflow, adjusting operational parameters in real-time to maintain reliability while minimizing energy consumption
Solution Approach 2:
The patent implements dynamic pump speed control that adjusts operational characteristics based on real-time system conditions. The pump speeds are continuously optimized to provide just enough flow to prevent backflow without excessive energy consumption, transforming static high-speed operation into dynamic optimized operation that balances reliability and energy efficiency
3Reliability
If flow splitting valves are adjusted to balance pressure drops, then backflow is prevented, but control system complexity increases
Solution Approach 1:
The control system uses feedback from pressure differential measurements to automatically adjust flow splitting valve positions. By monitoring pressure conditions across different fuel cell stacks and using this feedback to calculate optimal valve openings, the system achieves balanced pressure drops and prevents backflow through an automated feedback control mechanism rather than complex manual control systems
Solution Approach 2:
The patent replaces complex mechanical pressure balancing mechanisms with electronic control and calculation systems. Rather than using complex mechanical devices to physically balance pressure drops, the system uses electronic sensors, processors, and algorithms to calculate required valve positions and pump speeds, substituting electronic control for mechanical complexity while achieving the same pressure balance objective
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 solution effectively maintains balanced pressure drops across multiple fuel cell systems, preventing backflow and ensuring efficient cooling of the fuel cell stacks, even with a single common radiator.
Implementation Method 1
a single radiator common to at least two fuel cells
Implementation Method 2
first and second pumps pumping coolant through the first and second fuel cell systems
Implementation Method 3
controlling a temperature via a fluid that flows through fuel cell stacks
Data Source
AI summary
Systems and methods are provided for monitoring and controlling pump speeds to maintain a balanced pressure drop between each of the multiple fuel cell systems or circuits. In systems where a single radiator is used to maintain desired temperatures of multiple fuel cells, back flow can nevertheless be avoided. Control maps may be used to meet minimum pump speeds as a function of a flow splitting valve position and target flow rate (to prevent or avoid fluid back flow through a fuel cell stack). Control maps may also be used to determine a minimum pump speed as a function of three-way valve position (to prevent fluid back flow across a radiator path).