What is ISO 23631?

ISO 23631 is officially titled:

“Hydrogen fuel — Fuel consumption measurement for hydrogen-fuelled vehicles”

This standard provides a uniform method for testing and reporting hydrogen fuel consumption in vehicles that use hydrogen as a fuel source, including:

  1. Hydrogen Fuel Cell Electric Vehicles (FCEVs)
  2. Hydrogen Internal Combustion Engine Vehicles (H2-ICEVs)

The standard covers:

  1. Test procedures under standardized driving cycles
  2. Measurement methods for both gaseous and liquid hydrogen
  3. Correction factors for temperature, pressure, and humidity
  4. Procedures to calculate fuel consumption per unit distance or energy

This enables fair and consistent comparison of vehicle efficiency, supports regulatory compliance, and enhances consumer confidence.

Why is ISO 23631 important?

Hydrogen vehicles play a key role in decarbonizing transport. However, without standard methods to measure and report fuel consumption:

  1. Consumers and regulators cannot compare vehicle efficiency
  2. Manufacturers may face barriers to certification
  3. Governments cannot develop fair policies or incentive programs

ISO 23631 addresses this by defining clear, reproducible fuel consumption metrics for hydrogen-powered vehicles under various test conditions, supporting transparency and industry growth.

What are the benefits of ISO 23631?

Adopting ISO 23631 brings several advantages:

  1. Standardized Fuel Consumption Testing: Enables global harmonization of testing and reporting
  2. Accuracy in Hydrogen Measurement: Accounts for hydrogen density, state (gas/liquid), and environmental conditions
  3. Supports Green Energy Transition: Drives innovation and transparency in clean vehicle technologies
  4. Regulatory Readiness: Aligns with emerging policies on hydrogen fuel efficiency
  5. Promotes Consumer Confidence: Provides reliable data to end-users and fleet managers


What kind of businesses can benefit from ISO 23631?

Implementing ISO 23631 can transform your business operations and reputation in the hydrogen economy:

  1. Achieve Market and Regulatory Compliance

         Meet current and future global emissions, energy, and fuel efficiency regulations.

  1. Support R&D and Product Development

          Use standardized testing to benchmark and improve vehicle performance.

  1. Boost Global Acceptance of Hydrogen Vehicles

          Ensure your vehicles are compatible with international certification bodies.

  1. Promote Sustainable Branding

          Enhance your reputation by adopting international clean fuel standards.

  1. Enable Fair Competition

          Level the playing field by comparing vehicle efficiency using uniform metrics.

  1. Support Government Incentive Qualification

          Fuel economy figures calculated per ISO 23631 may be used in subsidy and grant programs.


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