New National Standard Advances Fuel Cell Vehicle Testing in China
As the global automotive industry accelerates its shift toward sustainable mobility, hydrogen-powered fuel cell electric vehicles (FCEVs) have emerged as a promising solution to reduce carbon emissions and dependence on fossil fuels. In China, where the government has placed strong emphasis on green transportation and energy diversification, the development of FCEVs has gained significant momentum. A critical milestone in this journey was reached in November 2023 with the official release and implementation of GB/T 43252-2023, titled Test Methods of Energy Consumption and Range for Fuel Cell Electric Vehicles. This national standard marks a pivotal advancement in the technical evaluation framework for FCEVs, offering a comprehensive and standardized approach to measuring energy consumption and driving range—two of the most crucial performance indicators for consumers and regulators alike.
The introduction of GB/T 43252-2023 reflects China’s growing maturity in hydrogen mobility regulation. Unlike conventional internal combustion engine vehicles or battery electric vehicles (BEVs), FCEVs present unique challenges in performance testing due to their hybrid power systems, which typically combine a fuel cell stack with a rechargeable energy storage system (REESS), such as a lithium-ion battery. The interaction between these two energy sources complicates the accurate assessment of fuel efficiency and range, particularly when the battery contributes significantly to propulsion. Prior to this standard, there was a lack of uniformity in testing methodologies, leading to inconsistencies in reported data and difficulties in comparing vehicle performance across manufacturers.
GB/T 43252-2023 addresses these challenges by establishing a clear, repeatable, and scientifically rigorous protocol for evaluating FCEVs on chassis dynamometers. Developed under the guidance of the State Administration for Market Regulation and the Standardization Administration of China, the standard applies specifically to M-class and N-class vehicles powered by compressed gaseous hydrogen. M-class vehicles refer to passenger cars and buses, while N-class encompasses various types of commercial trucks and delivery vehicles. By focusing on these categories, the standard supports the evaluation of both personal and fleet-use hydrogen vehicles, which are increasingly being deployed in urban transit and logistics operations across China’s major metropolitan areas.
One of the most significant contributions of the new standard is its systematic approach to vehicle classification. Recognizing that FCEVs vary widely in how they utilize hydrogen and battery power, the standard introduces a classification system that divides vehicles into two distinct categories: Type A and Type B. This differentiation is based on the ratio (denoted as α) of the net energy change in the REESS during a test cycle to the total energy derived from hydrogen consumption. If α is less than or equal to 1%, the vehicle is classified as Type A, indicating that the fuel cell stack is the dominant power source and the battery plays a minimal role in propulsion. Conversely, if α exceeds 1%, the vehicle is classified as Type B, meaning that the battery contributes significantly to the vehicle’s energy output and must be accounted for separately in the assessment.
This classification is not merely academic—it directly influences the testing methodology applied. For Type A vehicles, where the fuel cell is the primary driver, the standard allows for a “shortened method” of testing. Instead of depleting the entire hydrogen supply, testers conduct a fixed number of driving cycles—typically six—and then extrapolate the total range based on hydrogen consumption and distance traveled. This approach improves testing efficiency without sacrificing accuracy, as the minimal battery involvement ensures that energy use remains consistent across cycles. The shortened method is particularly beneficial for large commercial vehicles, such as long-haul trucks and city buses, which often carry substantial hydrogen payloads that would otherwise require extended and resource-intensive testing.
In contrast, Type B vehicles, which rely more heavily on battery power, must undergo a “complete depletion method,” commonly referred to as the “run-out method.” In this process, the vehicle is driven on a dynamometer until it can no longer maintain the required speed profile or triggers a low-power warning from the onboard system. This ensures that both the fuel cell and the battery are fully utilized, allowing for a precise measurement of each component’s contribution to the total range. After the test, the energy consumed by the battery is determined through recharging from the grid, while hydrogen consumption is measured directly using gravimetric or volumetric methods in accordance with GB/T 35178. This dual-measurement approach enables a granular breakdown of energy use, providing transparency into how much of the vehicle’s performance is derived from hydrogen versus stored electricity.
The standard also specifies detailed requirements for test conditions to ensure consistency and comparability across different laboratories and vehicle models. These include ambient temperature control (23±3°C), vehicle preconditioning (a minimum 2-hour soak period), and the use of standardized driving cycles tailored to vehicle type. For example, passenger cars (M1 class) are tested using the China Light-duty Vehicle Test Cycle (CLTC-P), while urban buses follow the City Bus Test Cycle (CHTC-B). These cycles are designed to reflect real-world driving patterns in Chinese cities, incorporating frequent stops, low-speed cruising, and moderate acceleration—conditions under which fuel cell systems can operate efficiently.
Another critical aspect of the standard is the accurate determination of rolling resistance and aerodynamic drag, which are simulated on the chassis dynamometer using coast-down testing procedures outlined in GB/T 18352.6-2016 or GB/T 27840-2021. While manufacturers may provide their own resistance parameters, testing facilities are encouraged to verify these values independently to ensure data integrity. This attention to detail underscores the standard’s commitment to scientific rigor and reproducibility.
The implications of GB/T 43252-2023 extend beyond technical specifications. By establishing a unified benchmark for FCEV performance, the standard enhances consumer confidence, supports fair competition among automakers, and provides policymakers with reliable data for incentive programs and infrastructure planning. In recent years, China has launched several hydrogen mobility demonstration zones in regions such as Shanghai, Guangdong, Beijing-Tianjin-Hebei, Henan, and Hebei, aiming to accelerate the commercialization of fuel cell technologies. These initiatives rely on accurate performance data to assess the viability of hydrogen vehicles in real-world applications, from public transit to freight transport.
Moreover, the standard plays a vital role in aligning China’s regulatory framework with international best practices. While the European Union, Japan, and South Korea have long had established protocols for FCEV testing, China’s rapidly evolving hydrogen ecosystem required a tailored solution that accounts for local driving conditions, vehicle designs, and market dynamics. GB/T 43252-2023 fills this gap by offering a flexible yet robust methodology that can adapt to different vehicle architectures and usage scenarios. It also facilitates cross-border comparisons, enabling Chinese FCEVs to be evaluated on a global stage and supporting export opportunities for domestic manufacturers.
From an industry perspective, the adoption of this standard represents both a challenge and an opportunity. Automakers must now ensure that their vehicles meet the precise requirements for classification and testing, which may necessitate adjustments in powertrain calibration, energy management strategies, and even hydrogen storage design. However, the clarity provided by the standard reduces uncertainty in the certification process, allowing manufacturers to optimize their development timelines and bring vehicles to market more efficiently. Testing laboratories, meanwhile, benefit from a well-defined protocol that minimizes ambiguity and enhances data credibility.
The successful implementation of GB/T 43252-2023 also depends on the expertise of technical personnel involved in the testing process. As highlighted in a recent analysis published in Standard Science, professionals must pay close attention to pre-test preparations, including proper vehicle conditioning, accurate resistance simulation, and precise hydrogen metering. Even small deviations—such as insufficient soak time or incorrect pressure readings during hydrogen refueling—can lead to significant errors in reported energy consumption and range. Therefore, ongoing training, equipment calibration, and inter-laboratory validation are essential to maintaining the integrity of test results.
Looking ahead, the standard is expected to evolve in response to technological advancements and market feedback. Future revisions may incorporate provisions for cold-weather performance, high-altitude operation, or dynamic charging scenarios, especially as hydrogen refueling infrastructure expands and new vehicle types enter the market. Additionally, as the cost of hydrogen production decreases and green hydrogen becomes more widely available, the environmental benefits of FCEVs will become even more pronounced, further driving demand for accurate and transparent performance evaluation.
In conclusion, GB/T 43252-2023 represents a major step forward in the standardization of fuel cell electric vehicle testing in China. By introducing a scientifically sound, vehicle-specific, and transparent methodology for measuring energy consumption and range, the standard strengthens the foundation for the sustainable growth of the hydrogen mobility sector. It empowers stakeholders—from manufacturers and regulators to consumers and investors—with reliable data to make informed decisions. As China continues to lead in the global transition to clean transportation, this standard will serve as a critical tool in shaping the future of zero-emission mobility.
Wu Shiyu, Wang Guozhuo, Wang Zhijun, and Guo Ting from China Automotive Technology Research Center Co., Ltd. and China Automotive Inspection Center (Tianjin) Co., Ltd. contributed to the analysis of this standard in Standard Science 2024, No. 3, DOI: 10.3969/j.issn.1674-5698.2024.03.017. Their work provides valuable insights into the practical application of GB/T 43252-2023 and supports the ongoing development of fuel cell vehicle assessment technologies.