ISO 23828:2022

Overview

ISO 23828:2022 - Fuel cell road vehicles - Energy consumption measurement - Vehicles fuelled with compressed hydrogen - specifies standardized procedures for measuring hydrogen energy consumption and driving range of fuel cell passenger cars and light‑duty trucks (FCV and FCHEV) using compressed hydrogen. The third edition updates test methods, integrates externally chargeable fuel cell hybrid electric vehicles (FCHEV), and provides procedures for accurate reporting of hydrogen and electric energy contributions to vehicle range.

Key technical topics and requirements

• Scope and definitions: Clear terminology for ADT (applicable driving test), CD/CS states (charge‑depleting/charge‑sustaining), RESS (rechargeable energy storage system), state of charge of hydrogen, and nominal working pressure (NWP).
• Hydrogen measurement accuracy: Requirements to ensure precise assessment of hydrogen content and state of charge for compressed hydrogen tanks.
• Hydrogen consumption measurement methods: Three normative measurement methods are specified:
  • Pressure method (Annex A, normative)
  • Gravimetric method (Annex B, normative)
  • Flow method (Annex C, normative)
• Fuel consumption test procedures: Test conditions and instrumentation requirements, including ambient temperature, vehicle preconditioning and soak, chassis dynamometer set‑up, and movement to test room (detailed in Clause 7 and Annex J).
• RESS handling and corrections: Procedures for charging externally chargeable FCHEV, measuring RESS energy, allowable RESS energy balance ranges, and a correction procedure (linear correction method using a correction coefficient - Annex H, normative).
• Calculation and presentation: Methods for calculating driving range (Clauses 8–9), splitting contributions of hydrogen and electricity, and standardized result presentation (Clause 10 and informative Annexes K, F).

Practical applications and who uses this standard

ISO 23828:2022 is intended for:

• Vehicle manufacturers developing and validating fuel cell vehicles (FCV) and fuel cell hybrid electric vehicles (FCHEV).
• Independent test laboratories and certification bodies performing standardized energy consumption and driving range tests.
• Regulators and policymakers setting vehicle efficiency and range reporting requirements.
• Research institutions and OEM suppliers focused on hydrogen storage, RESS integration, and drivetrain energy balance.
• Hydrogen refuelling infrastructure developers seeking harmonized metrics for usable hydrogen and refuelling impacts.

Related standards

• ISO 10521 (road load)
• ISO 14687 (hydrogen fuel quality)
• ISO/TR 8713 (vocabulary for electrically propelled vehicles)
• References to NIST hydrogen density functions and ISO 19880‑1 concepts are used for state‑of‑charge calculations.

Keywords: ISO 23828:2022, fuel cell road vehicles, compressed hydrogen, energy consumption measurement, driving range, FCV, FCHEV, RESS, hydrogen measurement methods, chassis dynamometer.