Fuel Cell Operation Control for Load-Aware Stop and Low-Output Driving

Solution Overview

Problem

Existing fuel cell control systems in vehicles with both fuel cell and battery systems suffer from reduced fuel efficiency and shortened fuel cell stack durability due to the continuous operation of the fuel cell to maintain high battery state of charge, especially under high load and long-distance traveling conditions.

Innovation Solution

An operation controller for fuel cells that selectively performs driving stop control and low-output driving control based on the vehicle's internal state, including load weight and battery state of charge, rather than relying solely on the required drive output of the fuel cell.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the fuel cell system always operates to maintain high battery state of charge through low-output driving control, then the battery state of charge is maintained, but fuel efficiency deteriorates and stack durability is shortened

Engineering Contradiction:

Improvebattery state of chargeVSAvoidfuel efficiency

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The control system dynamically adjusts the fuel cell output based on real-time vehicle conditions (acceleration, speed, load weight) rather than maintaining a fixed low-output state. The processor continuously monitors vehicle state and modulates the fuel cell output accordingly, enabling the system to operate at optimal efficiency points when conditions permit while still maintaining battery charge levels.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes operational parameters by introducing multiple control dimensions beyond just battery SOC. It incorporates vehicle acceleration, vehicle speed, and load weight as additional parameters to determine fuel cell output, allowing the system to adapt its operation mode (including stopping the fuel cell when appropriate) based on the combined state of these parameters rather than solely maintaining charge.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If the fuel cell system always operates to maintain high battery state of charge, then the battery state of charge is maintained, but stack durability is shortened

Engineering Contradiction:

Improvebattery state of chargeVSAvoidstack durability

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The control system dynamically adjusts the fuel cell output based on real-time vehicle conditions (acceleration, speed, load weight) rather than maintaining a fixed low-output state. The processor continuously monitors vehicle state and modulates the fuel cell output accordingly, enabling the system to operate at optimal efficiency points when conditions permit while still maintaining battery charge levels.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system implements periodic stopping and resuming of the fuel cell based on varying vehicle conditions. Instead of continuous operation, the fuel cell is periodically stopped when vehicle conditions allow (low acceleration, low speed, light load) and resumed when conditions require additional power, reducing cumulative operating hours and wear on the stack while maintaining necessary battery charge levels.

Inventive Principle:

Principle #19Periodic action

3Reliability

If the fuel cell operates at low output to charge the battery, then the battery state of charge is maintained, but fuel efficiency deteriorates

Engineering Contradiction:

Improvebattery state of chargeVSAvoidfuel efficiency

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The control system dynamically adjusts the fuel cell output based on real-time vehicle conditions (acceleration, speed, load weight) rather than maintaining a fixed low-output state. The processor continuously monitors vehicle state and modulates the fuel cell output accordingly, enabling the system to operate at optimal efficiency points when conditions permit while still maintaining battery charge levels.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

Instead of forcing the fuel cell to operate at low output to charge the battery, the system inverts the approach by allowing the fuel cell to stop operating entirely when vehicle conditions permit. The battery serves as the primary power source during these periods, reversing the conventional charging paradigm and eliminating the inefficiency of operating the fuel cell at suboptimal low-power points.

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentUS12327897B2Operation controller of fuel cell and operation control method thereof

Publication Date: 2025.06.10 HYUNDAI MOTOR CO LTD

AI summary

An operation controller of a fuel cell and an operation control method thereof in a system for generating a drive output through a fuel cell and a battery includes a processor for selectively performing a driving stop control of the fuel cell through an operation variable including a required drive output and a load weight.