This　paper　investigated　the　emissions　performance　of　a　passenger　car　powered　by　the　hybrid　hydrogen-gasoline　engine　under　the　New　European　Driving　Cycle.　The　hydrogen　was　produced　from　an　onboard　water　electrolysis　hydrogen　generator　fixed　in　the　trunk.　The　test　results　demonstrated　that,　when　the　engine　was　started　with　pure　hydrogen　for　the　first　7　s　and　fueled　with　the　pure　gasoline　after　11　s　from　the　onset　of　the　cold　start,　CO　and　HC　emissions　were　reduced　by　62.1%　and　64.1%,　respectively.　The　vehicle　emissions　performance　could　be　improved　from　the　Euro-II　emissions　standard　of　the　original　vehicle　to　the　Euro-IV　emissions　standard　of　the　hybrid　hydrogen-gasoline　engine-powered　vehicle.　(c)　2013　Elsevier　Ltd.　All　rights　reserved.