China Just Approved A Hydrogen Engine That Could Challenge Diesel Trucks

Not to be confused with hydrogen fuel cells, this hydrogen-powered internal combustion engine made by Chinese company Weichai could be huge for heavy machinery. Chinese engine manufacturer Weichai Power recently announced its development of a hydrogen direct‑injection engine for heavy-duty vehicles. Named the WP15, on July 3, 2026, this engine passed the China VI vehicle emission certification tests, the country's toughest heavy-duty emissions standard. This emissions certification required a wide variety of operating conditions, including full-load at high speeds, idling at low speeds, and starting from cold, confirming that the engine could run stably and reliably while delivering the lowest possible emissions. It is important to understand that this is not a hydrogen fuel cell, but rather an internal combustion piston engine that runs on hydrogen, with conventional spark ignition that differs from the way a diesel engine works. To refresh yourself, we suggest you check out our piece on how do hydrogen-powered auto engines work?