Idle　elimination　is　a　feasible　way　for　reducing　the　fuel　consumption　and　emissions　at　idle.　The　challenge　for　adopting　idle　elimination　on　gasoline　engine　is　the　high　emissions　during　restart　because　rich　mixtures　have　to　be　used　at　starting.　This　paper　tries　to　start　the　engine　with　pure　hydrogen　at　the　restart　for　gasoline　vehicles　which　adopt　idle　elimination.　The　investigation　was　done　based　on　models　built　on　AVL　CRUISE.　In　the　model,　the　vehicle　was　run　under　the　New　European　Driving　Cycle　(NEDC).　The　hydrogen　used　on　the　vehicle　was　online　produced　and　stored　by　an　on-board　hydrogen　production　and　storage　system.　The　energy　for　producing　hydrogen　is　taken　into　account　in　the　total　fuel　consumption.　The　simulation　results　showed　that,　with　the　adoption　of　gasoline　start-idle　elimination　strategy,　the　vehicle　fuel　consumption　during　NEDC　was　reduced　by　0.69　L/100　km,　and　NO.　emissions　were　decreased　by　5.5%　compared　with　the　original　vehicle　without　idle　elimination.　However,　HC　and　CO　emissions　at　the　restart　were　respectively　increased　by　87.5%　and　18.1%　for　the　gasoline　vehicle　due　to　the　adoption　of　rich　mixtures.　Comparatively,　with　the　adoption　of　hydrogen　start-idle　elimination　strategy,　the　vehicle　fuel　consumption　during　NEDC　was　reduced　by　0.79　L/100　km,　HC　and　CO　emissions　were　decreased　by　70.8%　and　13.6%,　respectively.　This　shows　a　good　capability　of　hydrogen　combustion　on　reducing　HC　and　CO　emissions　at　the　restart.　However,　NOx　emissions　were　slightly　increased　by　7.9%　under　the　hydrogen　restart　mode.　(C)　2016　Elsevier　Ltd.　All　rights　reserved.