Daihatsu Brings Ammonia-Hydrogen Co-Firing Engine to Bizweek 2026

Daihatsu is putting a physical ammonia and hydrogen co-firing engine on public display for the first time at the Japan Mobility Show Bizweek 2026, running from 13 to 16 October at Makuhari Messe in Chiba. Rather than presenting the powertrain as a finished product, the company is treating the exhibition as a recruiting ground, openly hunting for partners in ammonia reforming, exhaust purification, downsizing, safety and supply infrastructure.

The concept rests on ammonia’s role as a hydrogen carrier. Daihatsu points to the fuel’s ease of liquefaction and its comparatively high energy density as the reasons it remains in the company’s carbon-neutral planning. In the development-stage system, ammonia is drawn from a dedicated tank and a portion of it is converted into hydrogen through an engine-mounted plasma reactor working with a catalyst. That hydrogen is then burned alongside ammonia, which on its own ignites poorly, in the hope of achieving stable combustion and usable driving range. The vehicle installation concept shown at the event illustrates how the tank, reactor and engine would fit together.

The open questions Daihatsu is advertising are telling. Reforming, aftertreatment, downsizing, safety and infrastructure all appear on a problem list that the automaker does not pretend is close to resolution. That candid framing suggests the technology sits firmly in the research phase, with combustion retained as a pillar of the company’s carbon-neutral strategy rather than being abandoned in favour of pure electrification.

Two further energy projects share the stand. A containerised direct current microgrid, under trial since 2025, links solar generation and stationary storage with battery electric vehicles used as mobile batteries. At Daihatsu’s Shiga (Ryuo) plant, biogas produced from local Omi cattle manure is being used as factory fuel, with the fermentation residue sent back to farms.

A second theme at Bizweek covers artificial intelligence and community transport. Daihatsu will present an in-house no-code tool that lets factory teams build their own AI inspection models, alongside Goissho, a shared transport service aimed at welfare and nursing care facilities that is intended to ease staff shortages. Together the exhibits sketch a company exploring several routes at once, from unconventional combustion to software and services.

Whether ammonia co-firing can move beyond the demonstration stage depends largely on the partners Daihatsu hopes to meet in Chiba, and on how quickly the unresolved technical and infrastructural hurdles can be addressed.