At the Transpotec Logitec trade fair in Milan, dedicated to the transport industry, Ford Trucks Italia unveiled an F-Max L tractor unit equipped with the H-Dual dual-fuel system. The solution combines Hvo fuel with either hydrogen or biomethane, achieving a substantial reduction in emissions
There is something profoundly fascinating about periods of technological transition. They are never marked by abrupt revolutions but rather by layers of intelligent compromises and hybrid solutions that reveal more about the present than the future. The H-Dual project, promoted by Ford Trucks Italia in collaboration with a range of companies and institutions, including the Department of Energy at the Politecnico di Milano, fits precisely into this transitional space. Here, the conventional compression-ignition diesel engine—often prematurely portrayed as a technology in decline—demonstrates remarkable adaptability and resilience, evolving from the symbol of a fading era into the foundation of a new generation of decarbonization-oriented powertrains.
This is not an entirely new engine but rather a reinterpretation of the internal combustion paradigm. The operating principle remains that of compression ignition, a technology that is robust, reliable, and industrially mature. However, it is enhanced by the introduction of a light, almost ethereal fuel such as hydrogen, whose flame propagation speed and combustion characteristics differ radically from those of conventional diesel fuel.
Although the operating principle of the dual-fuel system appears straightforward, it conceals considerable technical sophistication. The process begins with HVO (Hydrotreated Vegetable Oil), a renewable fuel that replaces fossil diesel as the ignition source while ensuring combustion stability. Hydrogen or biomethane is then introduced as a complementary energy carrier. An advanced electronic management system continuously adjusts the proportion of each fuel in real time, optimizing combustion under varying operating conditions.
The result is a carefully orchestrated thermodynamic process in which injection timing, combustion chamber turbulence, and flame propagation must all be coordinated with exceptional precision. Hydrogen, because of its extremely rapid combustion characteristics, tends to accelerate flame development, improving thermal efficiency but also increasing the risk of undesirable phenomena such as pre-ignition and excessive pressure peaks. Biomethane, by contrast, exhibits a more gradual and predictable combustion behavior, integrating more harmoniously into the engine’s operating cycle and offering a smoother transition from conventional diesel technology.
This contrast reflects the dual nature of the H-Dual project. On one side lies the pursuit of maximum carbon dioxide reduction through hydrogen; on the other, the need for durability, reliability, and scalability represented by biomethane. These are not competing approaches but complementary pathways, each with its own strengths and limitations. One is ambitious, aiming for the highest possible level of decarbonization; the other builds upon established technologies to deliver practical, industrially viable solutions.
From an engine engineering perspective, these differences are significant. Hydrogen requires a comprehensive revision of combustion control strategies, with particular attention paid to thermal gradients and nitrogen oxide formation. Biomethane, meanwhile, allows a more conservative operating strategy, reducing stress on critical engine components such as pistons, valves, and turbochargers.
Like any sophisticated engineering solution, however, the H-Dual system presents its own technical challenges.
The most critical issue lies in combustion management. Controlling a highly reactive fuel such as hydrogen within an engine originally designed for conventional diesel means operating within a much narrower stability window. This requires highly sophisticated electronic controls, additional sensors, and predictive algorithms capable of continuously monitoring combustion conditions.
Thermal management represents another key challenge. While higher peak combustion temperatures improve efficiency, they also accelerate wear and place greater demands on materials and cooling systems.
Emissions, too, do not simply disappear—they evolve. Carbon dioxide emissions are significantly reduced, but nitrogen oxide emissions may increase, making further refinement of exhaust after-treatment systems essential.
Moving from the laboratory to industrial production introduces additional layers of complexity. The decision to develop H-Dual as an advanced retrofit solution is both pragmatic and strategically important, allowing existing vehicle fleets to be upgraded without waiting for complete fleet replacement. At the same time, however, every engine, every vehicle configuration, and every operating cycle presents unique variables, making standardization considerably more challenging.
Industrialization therefore becomes more than a manufacturing issue; it requires the harmonization of components, regulations, and real-world operating conditions.
Above all, the project depends on an infrastructure that has yet to be fully developed. Without a widespread hydrogen distribution network, the technology risks remaining an outstanding engineering achievement confined to demonstration projects or dedicated fleets.
Safety inevitably becomes another fundamental consideration. Hydrogen is exceptionally light, highly diffusive, and difficult to contain, requiring a completely new engineering philosophy based on advanced materials, dedicated sensors, and continuously evolving safety protocols. It represents not only a technological transformation but also a profound change in engineering culture.
Finally, there is the question that ultimately determines the success of every new technology: cost. The economic sustainability of a dual-fuel solution depends on a delicate balance between fuel prices, public incentives, and the long-term durability of the system itself.
Viewed in this broader context, the H-Dual project should be regarded as an unfinished work in the most positive sense of the term. It is not a final destination but a transitional step—a bridge between established technologies and those that are still taking shape. It is not the definitive solution to transport decarbonization, but it is a practical, technically credible response, distinguished by its ability to adapt existing technology to the realities of today’s transport sector.
Title: Ford F-Max L H-Dual: dual-fuel transport
Translation with ChatGPT
