In　the　context　of　carbon　neutrality,　high　efficiency,　low　carbon,　and　zero　environmental　impact　have　become　an　essential　development　direction　of　internal　combustion　engines　(ICEs).　Hydrogen　energy　has　the　advantage　of　having　a　high　calorific　value.　It　also　has　zero　carbon　emissions　and　is　considered　one　of　the　significant　alternative　fuels　for　ICEs.　Moreover,　ammonia　has　a　high　octane　number　and　has　an　anti-knock　effect,　which　facilitates　the　mitigation　of　knock　in　hydrogen　ICEs　and　potentially　mitigates　the　negative　impact　of　knock　on　engine　volume　power.　Scholars　have　carried　out　some　explorations　on　ammonia-hydrogen　ICEs　(AHICE),　which　have　been　applied　in　marine　power　systems.　It　is　anticipated　that　AHICE　will　become　one　of　the　most　significant　development　directions　in　the　field　of　vehicle　power　systems　in　the　future.　However,　there　are　still　some　problems　with　using　AHICEs　in　passenger　cars.　The　proposed　work　presented　a　zero-carbon　hybrid　power　system　based　on　an　AHICE.　Specifically,　the　external　characteristics　curve　and　power　output　boundary　were　obtained　by　bench　experiments　of　the　ICE　under　wide　open　throttle　(WOT)　conditions　and　diverse　engine　speeds　and　lambda.　Indeed,　a　hybrid　system　model　consisting　of　an　AHICE　and　a　power　battery　was　built　where　the　AHICE　was　used　to　respond　to　the　demanded　power　and　the　power　battery　was　used　to　provide　additional　power　and　store　the　electrical　energy　converted　from　braking.　Incidentally,　an　engine　control　strategy　was　developed　to　expand　the　knock　limit　and　power　boundary　by　dynamically　adjusting　the　ammonia-hydrogen　volume　ratio.　Finally,　a　hybrid　power　system　simulation　model　was　established　based　on　MATLAB/Simulink.　The　CLTC-P　and　WLTC　simulation　results　demonstrated　that　the　zero-carbon　hybrid　system　which　comprised　AHICE　and　power　battery　can　work　in　the　high　efficiency　area.　The　AHICE　demonstrates　lower　fuel　consumption　while　satisfying　power　requirements.　This　work　provides　a　promising　route　to　zero-carbon　hybrid　technology　for　the　passenger　car　industry　facing　the　challenge　of　carbon　neutrality.