Hydrogen-fueled　Wankel　rotary　engine,　with　few　available　research　currently,　has　excellent　power　and　emission　characteristics,　however,　with　lower　efficiency.　With　increasing　attention　to　low-carbon　emission,　it　is　of　great　significance　to　explore　methods　to　improve　the　efficiency　of　hydrogen-fueled　Wankel　rotary　engines.　This　work　aims　to　study　the　effect　of　qualitative　control　coupling　variable　engine　speeds　at　the　wide-open　throttle　on　the　power　control.　The　comparative　effect　of　qualitative　control　coupling　engine　speeds　from　1000　r/min　to　1500　r/min　under　the　wide-open　throttle　and　quantitative　control　at　1500　r/　min　on　the　combustion　and　emission　characteristic　of　hydrogen-fueled　Wankel　rotary　engine　is　investigated.　The　results　show　that　compared　with　quantitative　control,　qualitative　control　coupling　variable　engine　speed　can　achieve　excellent　performance.　The　brake　thermal　efficiency　can　be　maximally　increased　by　43.5%,　an　absolute　increase　of　6.22%,　as　well　the　volumetric　efficiency　with　a　maximal　105%　improvement.　The　thermal　load　and　risk　of　knock　can　be　greatly　reduced.　Moreover,　NO　emission　also　can　be　reduced　by　more　than　an　order　of　magnitude　or　even　by　zero.　Although　there　is　an　increase　in　cyclic　variation,　the　value　is　no　more　than　4%.　In　addition,　qualitative　control　coupling　variable　engine　speed　allows　flexible　matching　of　appropriate　engine　speed　and　excess　air　ratio　based　on　the　actual　requirements　of　efficiency,　stability,　durability　and　emission.(c)　2021　Published　by　Elsevier　Ltd　on　behalf　of　Hydrogen　Energy　Publications　LLC.