Hydrogen-fueled　internal　combustion　engine　is　proposed　to　resist　the　threat　of　global　warming.　Wankel　rotary　engine　(WRE)　has　been　proven　to　be　an　excellent　hydrogen-fueled　power　device,　which　can　overcome　the　shortcomings　of　hydrogen,　such　as　poor　power,　serious　backfire　and　large　storage　volume,　to　some　extent　when　it　is　used　as　fuel　in　the　internal　combustion　engine.　However,　due　to　its　unique　structure,　WRE　suffers　from　severe　knock.　Therefore,　the　goal　of　this　work　is　to　investigate　the　impacts　of　knock　type　on　the　heat　release　process　in　hydrogen-fueled　WRE.　This　present　work　is　conducted　at　2000　r/min　and　wide-open　throttle.　The　main　results　are　as　follows:　In　hydrogen-fueled　WRE,　the　peak　knock　pressure　of　knock　caused　by　rapid　and　unstable　combustion　of　hydrogen　is　usually　earlier　than　CA50　and　that　of　knock　caused　by　spontaneous　combustion　of　end　gas　is　usually　later　than　CA50.　The　sequence　between　the　crank　angle　of　peak　knock　pressure　and　CA50　combined　with　knock　intensity　can　be　used　to　determine　the　knock　type　in　hydrogen-fueled　WRE.　Besides,　a　means　for　knock　detection　is　proposed　according　to　the　distribution　of　crank　angle　corresponding　to　peak　knock　pressure.　In　addition,　the　distribution　of　CA0-10,　CA50　and　CA10-90　of　1000　consecutive　cycles　under　two　kinds　of　knock　in　hydrogen-fueled　WRE　are　discussed　in　detail,　and　regular　conclusions　are　drawn.　In　particular,　the　limitation　of　CA50　as　a　metric　for　evaluating　knock　level　is　also　demonstrated.　©　2022