Fuel Cell Power-Split Control for Durability and Load Smoothing

Solution Overview

Problem

The fuel cell electric vehicle (FCEV) industry lacks effective methods to manage and extend the service life of fuel cells, which are significantly impacted by load profiles, leading to limited durability and performance.

Innovation Solution

A power-split control system that actively manages power demand between the fuel cell and battery in FCEVs, using historical drive cycle data and look-ahead eHorizon data to optimize fuel cell operational life by operating in charge sustaining and charge depletion modes, minimizing fuel cell degradation and extending its lifespan.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the fuel cell operates to meet power demand in a conventional load-following manner, then the power demand is met, but the fuel cell degradation increases and operational life decreases

Engineering Contradiction:

Improvefuel cell operational lifeVSAvoidpower demand response

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The controller uses look-ahead eHorizon data to predict future power demands and proactively adjusts fuel cell power output in advance, preventing excessive battery discharge while avoiding sudden load changes that cause degradation. This preliminary action allows the fuel cell to operate in more stable conditions while still meeting future power demands.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system continuously monitors battery state of charge and uses feedback control to adjust fuel cell power output. The controller compares actual battery SOC with target SOC and dynamically adjusts fuel cell contribution to maintain battery health while meeting power demands, creating a closed-loop control system that balances durability and performance.

Inventive Principle:

Principle #23Feedback

2Reliability

If the fuel cell operates at variable load conditions to match power demand, then the power demand is met, but the fuel cell experiences increased degradation

Engineering Contradiction:

Improvefuel cell durabilityVSAvoidpower demand adaptation

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The system dynamically adjusts the fuel cell operating point based on predicted power demands and current battery state of charge. The controller continuously optimizes the fuel cell power output to maintain operation near optimal efficiency points while adapting to varying power demands through coordinated battery support, rather than directly following load variations.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes operational parameters by shifting the fuel cell operating point away from direct load-following modes to more stable operating regions. The controller adjusts fuel cell power output parameters based on eHorizon predictions and battery SOC, maintaining fuel cell operation in regions that minimize degradation while still meeting overall power demands through the hybrid powertrain.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If the battery compensates for all power demand variations, then the fuel cell operates steadily, but the battery state of charge depletes excessively

Engineering Contradiction:

Improvefuel cell steady state operationVSAvoidbattery state of charge

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The controller uses look-ahead eHorizon data to predict future power demands and proactively adjusts fuel cell power output in advance, preventing excessive battery discharge while avoiding sudden load changes that cause degradation. This preliminary action allows the fuel cell to operate in more stable conditions while still meeting future power demands.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system continuously monitors battery state of charge and uses feedback control to adjust fuel cell power output. The controller compares actual battery SOC with target SOC and dynamically adjusts fuel cell contribution to maintain battery health while meeting power demands, creating a closed-loop control system that balances durability and performance.

Inventive Principle:

Principle #23Feedback

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 power-split control system effectively extends the operational life of fuel cells by maintaining them at steady state operating conditions, reducing degradation, and optimizing power distribution, thereby enhancing the overall performance and longevity of FCEVs.

Implementation Method 1

The most common fuel cell is a hydrogen fuel cell that uses hydrogen gas and oxygen from the air to generate electricity through an electrochemical reaction.

Methodology Applied

Scientific EffectElectrochemical reaction: Fuel Cell

Data Source

PatentUS12179633B2Fuel cell system power-split control for component durability management

Publication Date: 2024.12.31 UT BATTELLE LLC

AI summary

An improved power-split control system for managing a load profile of a fuel cell in a fuel cell electric vehicle (FCEV) is provided. The power-split control system is operable to actively manage the power demand between the fuel cell and the battery of a FCEV to optimize the operational life of the fuel cell. The power-split control system can use information gathered solely from historical drive cycle data or from historical drive cycle data combined with look-ahead eHorizon data. The power-split control system meets a power demand by operating the powertrain in either a battery charge sustaining mode or a battery charge depletion mode. The power-split control system is also configured to control the power distribution (to the electric motor) from the fuel cell and the battery in a manner that minimizes the degradation of the fuel cell.