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The addition of hydrogen peroxide and steam to a hydrogen-fuelled HCCI engine was investigated at various fuel lean conditions (ϕeff = 0.2–0.6) compression ratios (15–20) using 0-dimensional numerical model. use as an ignition promoter demonstrated increased IMEP (16%–39%), thermal efficiency (up 2%), reduced NOx (50%–76%) when compared the conventional method intake charge heating. When used promoter, 15% sufficient reduce by 93%–97%, though this slightly. heat transfer considered from 0%–10%, no increase in air heating able match 5% without equivalence ratio 40%). parametric space (0%–25%) (0%–40%) explored view performance metrics, showing complete range possible through control both inputs. A three-order reduction addition. An optimal balance emissions occurred 5%–10% 10%–15% In study ratio, very little (<5%) required achieve 98% maximum higher (19–20), lower (<17) impractical quantities were required. 10% present these led extremely low levels for ϕeff 0.3 0.4, 0.5 would require some after-treatment. Maintaining constant high or load across additions reasonable adjustment