Hauv kev tsim hluav taws xob hluav taws xob, Octane thiab Cetane Numbers feem ntau conflated los ntawm cov neeg siv khoom, tab sis lawv txheeb xyuas qhov kev tawm tsam ntawm kev siv hluav taws xob hauv cov hluav taws xob hluav taws xob (SI) thiab compression-ignition (CI) cov cav, feem. Lawv qhov sib txawv tseem yog qhov tseem ceeb rau cov roj specification, kev sib xyaw, thiab kev ua haujlwm ntawm lub cav raws li 2026 roj qauv hloov zuj zus.
Tus naj npawb octane-feem ntau yog qhia raws li Kev Tshawb Fawb Octane Number (RON) lossis lub twj tso kua mis octane nruab nrab- ntsuas cov roj av tsis kam mus rau autoignition, lossis khob, nyob rau hauv lub txim taws teeb. Cov octane siab dua tso cai rau cov cav ua haujlwm ntawm qhov sib piv siab dua yam tsis muaj kev tawg ntxov ntxov. Cov pa roj twj tso kua mis yog li ntawm 84 txog 93 octane.
Cetane tus lej ua haujlwm nyob rau hauv qhov tseeb ntawm qhov sib txawv. Nws quantifies ib tug diesel roj txaus siab rau nws pib-ignite nyob rau hauv compression, xav txog ignition ncua: siab dua cetane txhais tau tias sai, smoother combustion thiab yooj yim txias pib. Kev lag luam diesel feem ntau yog li ntawm 40 txog 60 cetane, nrog rau cov plag tsev hauv cheeb tsam xws li EU qhov tsawg kawg nkaus ntawm 51. Nyob rau hauv luv luv, "qhov twg octane ntsuas tsis kam pib-ignition, cetane ntsuas kam rau nws pib-ignite".
Ob lub zog yog ntsuas nyob rau hauv incompatible standardized regimes. Gasoline octane yog txiav txim siab hauv CFR xyaw ib ASTM D2699 (RON) thiab D2700 (MON); Diesel cetane siv ASTM D613 los yog muab tau tus lej cetane (DCN) xws li ASTM D6890. Cov roj av feem ntau dhau los ntawm autoignition-resistant rau D613 kev sim, thaum cov roj diesel tsis muaj qhov tsis haum rau D2699 / D2700 raws tu qauv.
Qhov kev sib txawv no nqa qhov hnyav hnyav. High-octane roj av enables efficiency los ntawm compression piv, whereas high-cetane diesel muab smoother combustion thiab txo injector hnav. Raws li biodiesel blending nce nyob rau hauv 2026, cetane tswj-feem ntau ntawm cov additives-tseem muaj ib tug tseem ceeb zoo lever, txawm tias ob metrics tseem ua hauj lwm nyob rau hauv opposite sab ntawm lub ignition spectrum.
