Two-Stroke Hydrogen Engine from Argonne and Achates Sets New Standards

The collaboration between the U.S. Department of Energy’s (DOE) Argonne National Laboratory and Achates Power is pushing the boundaries of efficiency with the development of a two-stroke, opposed-piston engine fueled by hydrogen.

While the concept of an opposed-piston engine may trace back to the late 19th century, its potential for modern applications is far from obsolete. With its unique design, featuring two pistons operating in the same cylinder, this engine offers inherent advantages in terms of simplicity, power density, and thermal efficiency. Unlike its four-stroke counterpart, it eliminates the need for balancing mechanisms and provides a wider range of optimal engine torque.

The decision by Argonne National Laboratory and Achates Power to explore hydrogen as a fuel for this engine stems from its remarkable properties. Recent advancements in electronic controls, fuel injection, and sensor technology have paved the way for optimizing its performance. Hydrogen’s high reactivity and low ignition energy contribute to reduced efficiency losses, while the two-stroke combustion cycle generates twice as much energy per revolution compared to conventional engines.

Initial tests of the two-stroke hydrogen engine have yielded promising results, showcasing significant improvements in efficiency and power output. By minimizing heat loss and capitalizing on hydrogen’s unique combustion characteristics, the engine emerges as a lightweight, highly efficient, and carbon-free alternative. Achates and Argonne envision its application in various sectors, including long-haul commercial trucks, off-road vehicles for mining and agriculture, and military vehicles.

As development efforts progress, the focus shifts toward scaling up the technology for real-world deployment. Full-scale tests, involving vehicle or generator prototypes, will provide crucial insights into the engine’s performance under practical conditions. With continued innovation and collaboration, the inverted piston hydrogen engine holds the potential to revolutionize transportation, offering a sustainable solution for reducing emissions and advancing energy efficiency.