{"id":4760,"date":"2019-02-15T00:40:17","date_gmt":"2019-02-15T00:40:17","guid":{"rendered":"http:\/\/www.autolexicon.net\/?p=4760"},"modified":"2021-01-25T20:30:52","modified_gmt":"2021-01-25T20:30:52","slug":"cetanove-cislo","status":"publish","type":"post","link":"https:\/\/www.autolexicon.net\/sk\/articles\/cetanove-cislo\/","title":{"rendered":"Cet\u00e1nov\u00e9 \u010d\u00edslo"},"content":{"rendered":"<p><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-size: small; font-family: verdana,geneva;\"><span id=\"result_box\" class=\"\" tabindex=\"-1\" lang=\"sk\"><span title=\"\u010c\u00edm vy\u0161\u0161\u00ed je Cetanov\u00e9 \u010d\u00edslo, t\u00edm l\u00e9pe motor funguje. \"><span title=\"Po\u017eadavek na dobrou vzn\u011btlivost vst\u0159ikovan\u00e9ho paliva plyne z principu pr\u00e1ce vzn\u011btov\u00e9ho motoru.\">Po\u017eiadavka na dobr\u00fa popudlivos\u0165 vstrekovan\u00e9ho paliva plynie z princ\u00edpu pr\u00e1ce vznetov\u00e9ho motora. <\/span><span title=\"Pro spr\u00e1vn\u00fd chod vzn\u011btov\u00e9ho motoru je charakteristick\u00fd tzv. pr\u016ftah vzn\u00edcen\u00ed.\">Pre spr\u00e1vny chod vznetov\u00e9ho motora je charakteristick\u00fd tzv. prie\u0165ah vznietenia. <\/span><span title=\"Pr\u016ftah vzn\u00edcen\u00ed je doba, kter\u00e1 uplyne mezi vst\u0159ikem paliva do spalovac\u00edho prostoru a okam\u017eikem vzn\u00edcen\u00ed.\"><strong>Prie\u0165ah vznietenia<\/strong> je doba, ktor\u00e1 uplynie medzi vstrekom paliva do spa\u013eovacieho priestoru a okamihom vznieteniu. <\/span><span title=\"Aby byla tato doba p\u0159im\u011b\u0159en\u00e1, z\u00e1le\u017e\u00ed nejen na chemick\u00e9m slo\u017een\u00ed a destila\u010dn\u00edch vlastnostech paliva, ale i na konstrukci vst\u0159ikovac\u00edho za\u0159\u00edzen\u00ed a proveden\u00ed spalovac\u00edho prostoru.\">Aby bola t\u00e1to doba primeran\u00e1, z\u00e1le\u017e\u00ed nielen na chemickom zlo\u017een\u00ed a destila\u010dn\u00fdch vlastnost\u00ed paliva, ale aj na kon\u0161trukciu vstrekovacieho zariadenia a prevedenie spa\u013eovacieho priestoru. <\/span><span title=\"Z hlediska vlastnost\u00ed paliva je vyj\u00e1d\u0159ena cetanov\u00fdm \u010d\u00edslem (C\u010c nebo CN).\">Z h\u013eadiska vlastnost\u00ed paliva je vyjadren\u00e1 <strong>cet\u00e1nov\u00fdm \u010d\u00edslom (C\u010c alebo CN)<\/strong>. <\/span><span title=\"Motor spaluj\u00edc\u00ed palivo s vy\u0161\u0161\u00edm cetanov\u00fdm \u010d\u00edslem l\u00e9pe startuje, m\u00e1 lep\u0161\u00ed v\u00fdkon, ti\u0161\u0161\u00ed a hlad\u0161\u00ed chod a tak\u00e9 v\u00fdfukov\u00e9 plyny maj\u00ed lep\u0161\u00ed emisn\u00ed slo\u017een\u00ed.\">Motor spa\u013euj\u00faci palivo s vy\u0161\u0161\u00edm cet\u00e1nov\u00fdm \u010d\u00edslom lep\u0161ie <a href=\"http:\/\/www.autolexicon.net\/articles\/studeny-start\/\">\u0161tartuje<\/a>, m\u00e1 lep\u0161\u00ed v\u00fdkon, tich\u0161\u00ed a hlad\u0161\u00ed chod a tie\u017e <a href=\"http:\/\/cs.wikipedia.org\/wiki\/V%C3%BDfukov%C3%A9_plyny\">v\u00fdfukov\u00e9 plyny<\/a> maj\u00fa lep\u0161iu <a href=\"http:\/\/www.autolexicon.net\/articles\/emise-vyfukovych-plynu\/\">emisn\u00e9 zlo\u017eenie<\/a>. <\/span><span title=\"Motor spaluj\u00edc\u00ed kvalitn\u011bj\u0161\u00ed naftu m\u00e1 i ni\u017e\u0161\u00ed spot\u0159ebu. \">Motor spa\u013euj\u00faci kvalitnej\u0161ie naftu m\u00e1 aj ni\u017e\u0161iu spotrebu.<\/span><\/span><\/span><br \/>\n<\/span><\/p>\n<p style=\"text-align: center;\" align=\"center\">&nbsp;<a href=\"http:\/\/www.autolexicon.net\/obr_clanky\/cs_cetanove_cislo_003.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-4750 size-medium\" title=\"nafta - ilustra\u010dn\u00fd obr\u00e1zok\" src=\"http:\/\/www.autolexicon.net\/obr_clanky\/cs_cetanove_cislo_003-500x309.jpg\" alt=\"\" width=\"500\" height=\"309\" srcset=\"https:\/\/www.autolexicon.net\/obr_clanky\/cs_cetanove_cislo_003-500x309.jpg 500w, https:\/\/www.autolexicon.net\/obr_clanky\/cs_cetanove_cislo_003-250x154.jpg 250w, https:\/\/www.autolexicon.net\/obr_clanky\/cs_cetanove_cislo_003.jpg 715w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/p>\n<p align=\"right\"><span style=\"font-size: small; font-family: verdana,geneva;\"><strong><em>nafta &#8211; ilustra\u010dn\u00fd obr\u00e1zok<\/em><\/strong><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-size: small; font-family: verdana,geneva;\"><span id=\"result_box\" class=\"\" tabindex=\"-1\" lang=\"sk\"><span title=\"Mal\u00e9 cetanov\u00e9 \u010d\u00edslo zp\u016fsob\u00ed, \u017ee prodleva vzn\u00edcen\u00ed je dlouh\u00e1 a v okam\u017eiku vzn\u00edcen\u00ed je ve spalovac\u00edm prostoru rozpr\u00e1\u0161eno a \u010d\u00e1ste\u010dn\u011b i odpa\u0159eno velk\u00e9 mno\u017estv\u00ed paliva.\"><strong>Mal\u00e9 cet\u00e1nov\u00e9 \u010d\u00edslo<\/strong> sp\u00f4sob\u00ed, \u017ee oneskorenie vznietenia je dlh\u00e1 a v okamihu vznietenia je v spa\u013eovacom priestore rozpr\u00e1\u0161en\u00e9 a \u010diasto\u010dne aj odparen\u00e9 ve\u013ek\u00e9 mno\u017estvo paliva. <\/span><span title=\"To zp\u016fsob\u00ed, \u017ee se sou\u010dasn\u011b vzn\u00edt\u00ed velk\u00e9 mno\u017estv\u00ed paliva, co\u017e zap\u0159\u00ed\u010din\u00ed p\u0159\u00edli\u0161 rychl\u00fd n\u00e1r\u016fst tlaku ve spalovac\u00edm prostoru motoru.\">To sp\u00f4sob\u00ed, \u017ee sa s\u00fa\u010dasne vznieti ve\u013ek\u00e9 mno\u017estvo paliva, \u010do zapr\u00ed\u010din\u00ed pr\u00edli\u0161 r\u00fdchly n\u00e1rast tlaku v spa\u013eovacom priestore motora. <\/span><span title=\"To m\u00e1 za n\u00e1sledek p\u0159\u00edli\u0161 \u201etvrd\u00fd chod\u201c motoru a jeho hlu\u010dnost. \">To m\u00e1 za n\u00e1sledok pr\u00edli\u0161 &#8220;tvrd\u00fd chod&#8221; motora a jeho hlu\u010dnos\u0165.<\/span><\/span><br \/>\n<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-size: small; font-family: verdana,geneva;\"><span id=\"result_box\" class=\"\" tabindex=\"-1\" lang=\"sk\"><span title=\"Velk\u00e9 cetanov\u00e9 \u010d\u00edslo naopak zp\u016fsob\u00ed, \u017ee prodleva vzn\u00edcen\u00ed je kr\u00e1tk\u00e1, a palivo za\u010d\u00edn\u00e1 ho\u0159et velmi bl\u00edzko u vst\u0159ikovac\u00ed trysky.\"><strong>Ve\u013ek\u00e9 cet\u00e1nov\u00e9 \u010d\u00edslo<\/strong> naopak sp\u00f4sob\u00ed, \u017ee oneskorenie vznietenia je kr\u00e1tka, a palivo za\u010d\u00edna horie\u0165 ve\u013emi bl\u00edzko pri vstrekovacej trysky. <\/span><span title=\"To vede k tomu, \u017ee palivo je nedostate\u010dn\u011b prom\u00edseno se vzduchem, doch\u00e1z\u00ed k nedokonal\u00e9mu ho\u0159en\u00ed a vzniku saz\u00ed.\">To vedie k tomu, \u017ee palivo je nedostato\u010dne premie sa vzduchom, doch\u00e1dza k nedokonal\u00e9mu horeniu a vzniku <a href=\"http:\/\/www.autolexicon.net\/articles\/emise-vyfukovych-plynu\/\">sadz\u00ed<\/a>. <\/span><span title=\"Nebezpe\u010dn\u00e1 je i bl\u00edzkost plamene u trysky, kter\u00e1 \u010dasto vede k jej\u00edmu zape\u010den\u00ed, tj. vzniku karbonov\u00fdch usazenin ucp\u00e1vaj\u00edc\u00edch v\u00fdst\u0159ikov\u00e9 otv\u016frky trysky, p\u0159\u00edpadn\u011b zad\u0159en\u00ed jehly trysky. \">Nebezpe\u010dn\u00e1 je aj bl\u00edzkos\u0165 plame\u0148a u trysky, ktor\u00e1 \u010dasto vedie k jej zape\u010denie, tj. Vzniku karb\u00f3nov\u00fdch usaden\u00edn upch\u00e1vaj\u00facich v\u00fdstrekovej otvor\u010deky trysky, pr\u00edpadne zadretiu ihly trysky.<\/span><\/span><br \/>\n<\/span><\/p>\n<p style=\"text-align: center;\" align=\"center\">&nbsp;<a href=\"http:\/\/www.autolexicon.net\/obr_clanky\/cs_vstrikovaci_tryska_001.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-4749 size-medium\" title=\"vadn\u00e1 tryska vs. funk\u010dn\u00e9 trysky\" src=\"http:\/\/www.autolexicon.net\/obr_clanky\/cs_vstrikovaci_tryska_001-500x134.jpg\" alt=\"\" width=\"500\" height=\"134\" srcset=\"https:\/\/www.autolexicon.net\/obr_clanky\/cs_vstrikovaci_tryska_001-500x134.jpg 500w, https:\/\/www.autolexicon.net\/obr_clanky\/cs_vstrikovaci_tryska_001-250x67.jpg 250w, https:\/\/www.autolexicon.net\/obr_clanky\/cs_vstrikovaci_tryska_001.jpg 1041w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/p>\n<p align=\"right\"><span style=\"font-size: small; font-family: verdana,geneva;\"><strong><em><span id=\"result_box\" class=\"\" tabindex=\"-1\" lang=\"sk\"><span title=\"vadn\u00e1 tryska vs.\">vadn\u00e1 tryska vs. <\/span><span title=\"funk\u010dn\u00ed tryska \">funk\u010dn\u00e9 trysky<\/span><\/span><\/em><\/strong><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-size: small; font-family: verdana,geneva;\"><span id=\"result_box\" class=\"\" tabindex=\"-1\" lang=\"sk\"><span title=\"V\u011bt\u0161ina motorov\u00fdch naft pou\u017e\u00edvan\u00fdch ve sv\u011bt\u011b pro pohon p\u00edstov\u00fdch spalovac\u00edch motor\u016f m\u00e1 cetanov\u00e9 \u010d\u00edslo 50 \u00b1 5. \u010cesk\u00e1 a evropsk\u00e1 norma vy\u017eaduje cetanov\u00e9 \u010d\u00edslo min.\">V\u00e4\u010d\u0161ina motorov\u00fdch naft pou\u017e\u00edvan\u00fdch vo svete pre pohon piestov\u00fdch spa\u013eovac\u00edch motorov m\u00e1 cet\u00e1nov\u00e9 \u010d\u00edslo 50 \u00b1 5. <strong>Slovensk\u00e1 a eur\u00f3pska norma vy\u017eaduje cet\u00e1nov\u00e9 \u010d\u00edslo min. <\/strong><\/span><span title=\"51, co\u017e je spodn\u00ed hranice z hlediska ekologie i pot\u0159eb modern\u00edch motor\u016f.\"><strong>51<\/strong>, \u010do je spodn\u00e1 hranica z h\u013eadiska ekol\u00f3gie i potrieb modern\u00fdch motorov. <\/span><span title=\"Na trhu se vyskytuje v\u011bt\u0161inou nafta s \u010d\u00edslem v rozsahu 51 a\u017e 55, \u0161pi\u010dkov\u00e9 nafty se v sou\u010dasnosti pohybuj\u00ed s cetanov\u00fdm \u010d\u00edslem v rozmez\u00ed 58 a\u017e 65 jednotek. \">Na trhu sa vyskytuje v\u00e4\u010d\u0161inou nafta s \u010d\u00edslom v rozsahu 51 a\u017e 55, \u0161pi\u010dkov\u00e9 nafty sa v s\u00fa\u010dasnosti pohybuj\u00fa s cet\u00e1nov\u00fdm \u010d\u00edslom v rozmedz\u00ed 58 a\u017e 65 jednotiek.<\/span><\/span><br \/>\n<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-size: small; font-family: verdana,geneva;\"><span id=\"result_box\" class=\"\" tabindex=\"-1\" lang=\"sk\"><span title=\"Stanoven\u00ed velikosti cetanov\u00e9ho \u010d\u00edsla \"><strong>Stanovenie ve\u013ekosti cet\u00e1nov\u00e9ho \u010d\u00edsla<\/strong><br \/>\n<\/span><span title=\"Zp\u016fsoby stanoven\u00ed cetanov\u00e9ho \u010d\u00edsla p\u0159edepisuj\u00ed technick\u00e9 normy \u010cSN EN ISO 5165(1998) a ASTM D 613. M\u011b\u0159en\u00ed se uskute\u010d\u0148uje na speci\u00e1ln\u00edch m\u011b\u0159ic\u00edch vzn\u011btov\u00fdch motorech, u kter\u00fdch se porovn\u00e1v\u00e1 konkr\u00e9tn\u00ed vzorek paliva s referen\u010dn\u00edm vzorkem a sleduje se, zda pr\u016fb\u011bh vzn\u011btu je v obou p\u0159\u00edpadech p\u0159i\">Sp\u00f4soby stanovenia cet\u00e1nu predpisuj\u00fa technick\u00e9 normy STN EN ISO 5165 (1998) a ASTM D 613. Meranie sa uskuto\u010d\u0148uje na \u0161peci\u00e1lnych merac\u00edch vznetov\u00fdch motoroch, u ktor\u00fdch sa porovn\u00e1va konkr\u00e9tne vzorka paliva s referen\u010dnou vzorkou a sleduje sa, \u010di priebeh vznet je v oboch pr\u00edpadoch pri <\/span><span title=\"zm\u011bn\u00e1ch kompresn\u00edho pom\u011bru stejn\u00fd. \">zmen\u00e1ch <a href=\"http:\/\/www.autolexicon.net\/articles\/kompresni-pomer\/\">kompresn\u00e9ho pomeru<\/a> rovnak\u00fd.<\/span><\/span><br \/>\n<\/span><\/p>\n<p style=\"text-align: center;\" align=\"center\">&nbsp;<a href=\"http:\/\/www.autolexicon.net\/obr_clanky\/cs_cetanove_cislo_001.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-4752 size-medium\" title=\"meracie motor pre stanovenie cet\u00e1nov\u00e9ho \u010d\u00edsla\" src=\"http:\/\/www.autolexicon.net\/obr_clanky\/cs_cetanove_cislo_001-397x500.jpg\" alt=\"\" width=\"397\" height=\"500\" srcset=\"https:\/\/www.autolexicon.net\/obr_clanky\/cs_cetanove_cislo_001-397x500.jpg 397w, https:\/\/www.autolexicon.net\/obr_clanky\/cs_cetanove_cislo_001-198x250.jpg 198w, https:\/\/www.autolexicon.net\/obr_clanky\/cs_cetanove_cislo_001.jpg 408w\" sizes=\"auto, (max-width: 397px) 100vw, 397px\" \/><\/a><\/p>\n<p align=\"right\"><span style=\"font-size: small; font-family: verdana,geneva;\"><strong><em><span id=\"result_box\" class=\"\" tabindex=\"-1\" lang=\"sk\"><span title=\"m\u011b\u0159\u00edc\u00ed motor pro stanoven\u00ed cetanov\u00e9ho \u010d\u00edsla \">meracie motor pre stanovenie cet\u00e1nov\u00e9ho \u010d\u00edsla<\/span><\/span><\/em><\/strong><\/span><\/p>\n<p style=\"text-align: justify;\"><span id=\"result_box\" class=\"\" style=\"font-family: verdana,geneva; font-size: 10pt;\" tabindex=\"-1\" lang=\"sk\"><span title=\"Ke stanoven\u00ed velikosti cetanov\u00e9ho \u010d\u00edsla se pou\u017e\u00edv\u00e1 stejn\u00fd jednov\u00e1lcov\u00fd motor, jako pro stanoven\u00ed velikosti oktanov\u00e9ho \u010d\u00edsla.\">Na stanovenie ve\u013ekosti cet\u00e1nov\u00e9ho \u010d\u00edsla sa pou\u017e\u00edva rovnak\u00fd jednovalcov\u00fd motor, ako pre stanovenie ve\u013ekosti <a href=\"http:\/\/www.autolexicon.net\/articles\/oktanove-cislo\/\">okt\u00e1nov\u00e9ho \u010d\u00edsla<\/a>. <\/span><span title=\"Tak jako v p\u0159\u00edpad\u011b ur\u010dov\u00e1n\u00ed oktanov\u00e9ho \u010d\u00edsla, je i cetanov\u00e9 \u010d\u00edslo ur\u010deno objemov\u00fdm pod\u00edlem dvou l\u00e1tek.\">Tak ako v pr\u00edpade ur\u010dovania<a href=\"http:\/\/www.autolexicon.net\/articles\/oktanove-cislo\/\"> okt\u00e1nov\u00e9ho \u010d\u00edsla<\/a>, je aj cet\u00e1nov\u00e9 \u010d\u00edslo ur\u010den\u00e9 objemov\u00fdm podielom dvoch l\u00e1tok. <\/span><span title=\"Cetanu (n-hexadekanu \u2013 cetanov\u00e9 \u010d\u00edslo 100 charakterizuj\u00edc\u00ed velmi kr\u00e1tkou prodlevu vzn\u00edcen\u00ed) a 1-methylnaftalenu (cetanov\u00e9 \u010d\u00edslo 0 charakterizuj\u00edc\u00ed velmi dlouhou prodlevu vzn\u00edcen\u00ed). \"><strong>Cet\u00e1nu<\/strong> (<a href=\"http:\/\/cs.wikipedia.org\/wiki\/N-hexadekan\">n-hexadek\u00e1nu<\/a> &#8211; cet\u00e1nov\u00e9 \u010d\u00edslo 100 charakterizuj\u00face ve\u013emi kr\u00e1tky \u010dasov\u00fd limit vznietenia) a <strong>1-metylnaftal\u00e9nu<\/strong> (cet\u00e1nov\u00e9 \u010d\u00edslo 0 charakterizuj\u00face ve\u013emi dlh\u00fa oneskorenie vznietenia).<\/span><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-family: verdana,geneva,sans-serif; font-size: 10pt;\"><span title=\"V\u00fdrobci vzn\u011btov\u00fdch motor\u016f u sv\u00fdch model\u016f v\u017edy p\u0159edepisuj\u00ed minim\u00e1ln\u00ed hodnoty cetanov\u00fdch \u010d\u00edsel pohonn\u00fdch l\u00e1tek, kter\u00e9 jsou pro n\u011b pot\u0159ebn\u00e9.\">V\u00fdrobcovia vznetov\u00fdch motorov u svojich modelov v\u017edy <strong>predpisuj\u00fa minim\u00e1lne hodnoty cetanov\u00fdch \u010d\u00edsel<\/strong> pohonn\u00fdch l\u00e1tok, ktor\u00e9 s\u00fa pre nich potrebn\u00e9. <\/span><span title=\"U nejmodern\u011bj\u0161\u00edch motor\u016f se po\u017eadovan\u00e9 hodnoty pohybuj\u00ed mezi 50 a\u017e 60. V budoucnosti se v\u0161ak budou tyto hodnoty postupn\u011b zvy\u0161ovat, zejm\u00e9na s ohledem na velikost emis\u00ed, p\u0159esto\u017ee dal\u0161\u00edm zvy\u0161ov\u00e1n\u00edm C\u010c se ji\u017e v\u00fdkony motoru p\u0159\u00edli\u0161 nezvy\u0161uj\u00ed.\">U najmodernej\u0161\u00edch motorov sa po\u017eadovanej hodnoty pohybuj\u00fa medzi 50 a\u017e 60. V bud\u00facnosti sa v\u0161ak bud\u00fa tieto hodnoty postupne zvy\u0161ova\u0165, najm\u00e4 s oh\u013eadom na ve\u013ekos\u0165 <a href=\"http:\/\/www.autolexicon.net\/articles\/emise-vyfukovych-plynu\/\">emisi\u00ed<\/a>, hoci \u010fal\u0161\u00edm zvy\u0161ovan\u00edm C\u010c sa u\u017e v\u00fdkonmi motora pr\u00edli\u0161 nezvy\u0161uj\u00fa. <\/span><span title=\"N\u011bkte\u0159\u00ed odborn\u00edci proto nedoporu\u010duj\u00ed dal\u0161\u00ed pronikav\u00e9 zvy\u0161ov\u00e1n\u00ed C\u010c. \">Niektor\u00ed odborn\u00edci preto neodpor\u00fa\u010daj\u00fa \u010fal\u0161ie prenikav\u00e9 zvy\u0161ovanie C\u010c.<\/span><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-family: verdana,geneva,sans-serif; font-size: 10pt;\"><span title=\"Motorov\u00e1 nafta neobsahuje p\u0159\u00edli\u0161 velk\u00e9 mno\u017estv\u00ed cetanu;\">Motorov\u00e1 nafta neobsahuje pr\u00edli\u0161 ve\u013ek\u00e9 mno\u017estvo cet\u00e1nu; <\/span><span title=\"ten je v\u00fdlu\u010dn\u011b u\u017e\u00edv\u00e1n pouze v porovn\u00e1vac\u00edch sm\u011bs\u00edch.\">ten je v\u00fdlu\u010dne u\u017e\u00edva\u0165 len v porovn\u00e1vac\u00edch zmesiach. <\/span><span title=\"Cetanov\u00e9 \u010d\u00edslo lze podobn\u011b jako oktanov\u00e9 \u010d\u00edslo u benz\u00ednu zvy\u0161ovat p\u0159\u00eddavkem speci\u00e1ln\u00edch p\u0159\u00edsad, nap\u0159. alkylnitr\u00e1t\u016f nebo di-terc.-butylperoxidu. \">Cet\u00e1nov\u00e9 \u010d\u00edslo mo\u017eno podobne ako <a href=\"http:\/\/www.autolexicon.net\/articles\/oktanove-cislo\/\">okt\u00e1nov\u00e9 \u010d\u00edslo<\/a> u benz\u00ednu zvy\u0161ova\u0165 pr\u00eddavkom \u0161peci\u00e1lnych pr\u00edsad, napr. Alkylnitr\u00e1t\u016f alebo di-terc-butyl-peroxidom.<\/span><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-size: small; font-family: verdana,geneva;\"><strong>Legislat\u00edvne normy<\/strong><br \/>\n<span id=\"result_box\" class=\"\" tabindex=\"-1\" lang=\"sk\"><span title=\"Hodnoty cetanov\u00e9ho \u010d\u00edsla pohonn\u00fdch l\u00e1tek maj\u00ed v\u00fdznamn\u00fd vliv na zne\u010di\u0161\u0165ov\u00e1n\u00ed p\u0159\u00edrodn\u00edho prost\u0159ed\u00ed, proto jsou jeho minim\u00e1ln\u00ed hodnoty p\u0159edepisov\u00e1ny pr\u00e1vn\u00edmi p\u0159edpisy.\">Hodnoty cet\u00e1nov\u00e9ho \u010d\u00edsla pohonn\u00fdch l\u00e1tok maj\u00fa v\u00fdznamn\u00fd vplyv na zne\u010dis\u0165ovanie pr\u00edrodn\u00e9ho prostredia, preto s\u00fa jeho minim\u00e1lne hodnoty predpisovan\u00e9 pr\u00e1vnymi predpismi. <\/span><span title=\"V sou\u010dasn\u00e9 dob\u011b platn\u00e1 legislativa povoluje na \u00fazem\u00ed st\u00e1t\u016f EU pou\u017e\u00edv\u00e1n\u00ed motorov\u00e9 nafty pro vzn\u011btov\u00e9 motory, kter\u00e1 m\u00e1 minim\u00e1ln\u00ed hodnotu cetanov\u00e9ho \u010d\u00edsla 51,0.\">V s\u00fa\u010dasnej dobe platn\u00e1 legislat\u00edva povo\u013euje na \u00fazem\u00ed \u0161t\u00e1tov E\u00da pou\u017e\u00edvanie motorovej nafty pre vznetov\u00e9 motory, ktor\u00e1 m\u00e1 minim\u00e1lnu hodnotu cet\u00e1nov\u00e9ho \u010d\u00edsla 51,0. <\/span><span title=\"To vypl\u00fdv\u00e1 ze Sm\u011brnice Evropsk\u00e9ho parlamentu a Rady \u010d. 98\/70\/ES ze dne 13. \u0159\u00edjna 1998 o jakosti benzinu a motorov\u00e9 nafty. \">To vypl\u00fdva zo <a href=\"http:\/\/eur-lex.europa.eu\/LexUriServ\/LexUriServ.do?uri=CONSLEG:1998L0070:20031120:sk:PDF\">Smernice Eur\u00f3pskeho parlamentu a Rady \u010d. 98\/70\/ES<\/a> z 13. okt\u00f3bra 1998 o kvalite benz\u00ednu a motorovej nafty.<\/span><\/span><\/span><\/p>\n<p><span style=\"font-size: small; font-family: verdana,geneva;\"><strong>Text:<\/strong> Jan Sajdl<strong><br \/>\nFoto: <\/strong>www.lcbamarketing.com, www.roper.cz,<strong><br \/>\n<\/strong><span id=\"result_box\" class=\"\" tabindex=\"-1\" lang=\"sk\"><span title=\"Kl\u00ed\u010dov\u00e1 slova: palivo, cetanov\u00e9 \u010d\u00edslo, cetan index, cetan number, diesel, nafta, kvalita paliva, vzn\u011btov\u00fd motor \"><strong>K\u013e\u00fa\u010dov\u00e9 slov\u00e1:<\/strong> palivo, cet\u00e1nov\u00e9 \u010d\u00edslo, cetan index, cetan number, diesel, diesel, kvalita paliva, vznetov\u00fd motor<\/span><\/span><\/span><\/p>","protected":false},"excerpt":{"rendered":"<p>Cet\u00e1nov\u00e9 \u010d\u00edslo ud\u00e1va kvalitu motorovej nafty z h\u013eadiska jej vznetov\u00e9 charakteristiky, teda ochoty nafty po vstreknut\u00ed do spa\u013eovacieho priestoru sa vznieti\u0165. Mo\u017eno poveda\u0165, \u017ee cet\u00e1nov\u00e9 \u010d\u00edslo je jedin\u00fd z parametrov nafty, ktor\u00fd vodi\u010d poc\u00edti u\u017e po\u010das jazdy. \u010c\u00edm vy\u0161\u0161ia je Cet\u00e1nov\u00e9 \u010d\u00edslo, t\u00fdm lep\u0161ie motor funguje.<\/p>\n","protected":false},"author":1,"featured_media":4750,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_container_layout":"default_layout","colormag_page_sidebar_layout":"default_layout","rop_custom_images_group":[],"rop_custom_messages_group":[],"rop_publish_now":"initial","rop_publish_now_accounts":{"facebook_10217573569066608_119527941460186":"","twitter_308591058_308591058":""},"rop_publish_now_history":[],"rop_publish_now_status":"pending","ngg_post_thumbnail":0,"two_page_speed":[],"footnotes":""},"categories":[86,4],"tags":[1183,1184,1182,282,1185,596,201,307],"class_list":["post-4760","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-palivo-a-provozni-naplne","category-casti-automobilu","tag-cetan-index","tag-cetan-number","tag-cetanove-cislo","tag-diesel","tag-kvalita-paliva","tag-nafta","tag-palivo","tag-vznetovy-motor"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Cet\u00e1nov\u00e9 \u010d\u00edslo - autolexicon.net<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.autolexicon.net\/sk\/articles\/cetanove-cislo\/\" \/>\n<meta property=\"og:locale\" content=\"sk_SK\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cet\u00e1nov\u00e9 \u010d\u00edslo - autolexicon.net\" \/>\n<meta property=\"og:description\" content=\"Cet\u00e1nov\u00e9 \u010d\u00edslo ud\u00e1va kvalitu motorovej nafty z h\u013eadiska jej vznetov\u00e9 charakteristiky, teda ochoty nafty po vstreknut\u00ed do spa\u013eovacieho priestoru sa vznieti\u0165. Mo\u017eno poveda\u0165, \u017ee cet\u00e1nov\u00e9 \u010d\u00edslo je jedin\u00fd z parametrov nafty, ktor\u00fd vodi\u010d poc\u00edti u\u017e po\u010das jazdy. \u010c\u00edm vy\u0161\u0161ia je Cet\u00e1nov\u00e9 \u010d\u00edslo, t\u00fdm lep\u0161ie motor funguje.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.autolexicon.net\/sk\/articles\/cetanove-cislo\/\" \/>\n<meta property=\"og:site_name\" content=\"autolexicon.net\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/autolexicon.net\" \/>\n<meta property=\"article:published_time\" content=\"2019-02-15T00:40:17+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-01-25T20:30:52+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.autolexicon.net\/obr_clanky\/cs_cetanove_cislo_003.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"715\" \/>\n\t<meta property=\"og:image:height\" content=\"443\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Ing. 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