{"id":1469,"date":"2024-12-23T06:35:47","date_gmt":"2024-12-23T06:35:47","guid":{"rendered":"https:\/\/www.motointegrator.se\/blog\/\/?p=1469"},"modified":"2025-06-04T10:14:38","modified_gmt":"2025-06-04T10:14:38","slug":"intressanta-fakta-om-luftmassesensor","status":"publish","type":"post","link":"https:\/\/www.motointegrator.se\/blog\/intressanta-fakta-om-luftmassesensor\/","title":{"rendered":"Intressanta fakta om luftmassesensor"},"content":{"rendered":"<p><a href=\"https:\/\/www.motointegrator.se\/reservdelar\/vw\/\">Volkswagen<\/a>\u00a0har varit upptagen under de senaste m\u00e5naderna och har gjort n\u00f6dv\u00e4ndiga programvaru\u00e4ndringar f\u00f6r att kunna ers\u00e4tta den manipulerade versionen. M\u00e5nga fordon har redan f\u00e5tt uppdateringen, och skandalen verkar \u00e4ntligen bli lite mer hanterbar. Men dieselbilarna med de aktuella motorerna \u00e4r redan p\u00e5 tapeten igen. Effekt- och vridmomentsf\u00f6rlust i mellanhastighetsomr\u00e5det eller spikning och ryckning av deras dieselmotor med uppdatering rapporteras nu av vissa \u00e4gare av ber\u00f6rda fordon. M\u00e5nga motorer kr\u00e4ver ocks\u00e5 ett fl\u00f6desgaller framf\u00f6r MAF-givare. H\u00e4r kan du l\u00e4sa varf\u00f6r massluftfl\u00f6dessensorn spelar en central roll.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Inneh\u00e5llsf\u00f6rteckning<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.motointegrator.se\/blog\/intressanta-fakta-om-luftmassesensor\/#Luftmassesensor_tillhandahaller_data_som_styrenheten_utvarderar\" >Luftmassesensor tillhandah\u00e5ller data som styrenheten utv\u00e4rderar<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.motointegrator.se\/blog\/intressanta-fakta-om-luftmassesensor\/#Intressanta_fakta_om_luftmassesensor_funktionsprincipen\" >Intressanta fakta om luftmassesensor: funktionsprincipen<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.motointegrator.se\/blog\/intressanta-fakta-om-luftmassesensor\/#Sensorens_roll_vid_avgasrening\" >Sensorens roll vid avgasrening<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.motointegrator.se\/blog\/intressanta-fakta-om-luftmassesensor\/#Symtom_pa_en_defekt_luftmassesensor\" >Symtom p\u00e5 en defekt luftmassesensor<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.motointegrator.se\/blog\/intressanta-fakta-om-luftmassesensor\/#Testning_av_massluftflodessensorn_utan_hjalpmedel\" >Testning av massluftfl\u00f6dessensorn utan hj\u00e4lpmedel<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.motointegrator.se\/blog\/intressanta-fakta-om-luftmassesensor\/#Med_den_nya_programvaran_verkar_MAF_och_ECU_inte_kommunicera_ordentligt\" >Med den nya programvaran verkar MAF och ECU inte kommunicera ordentligt<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Luftmassesensor_tillhandahaller_data_som_styrenheten_utvarderar\"><\/span>Luftmassesensor tillhandah\u00e5ller data som styrenheten utv\u00e4rderar<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Det finns en anledning till att massluftfl\u00f6dessensorn, f\u00f6rkortat MAF, hamnar i fokus n\u00e4r Volkswagen reparerar skadan. Till och med motorernas beteende efter att programvaruuppdateringen har installerats tyder p\u00e5 att de v\u00e4rden som tillhandah\u00e5lls av luftmassesensor \u00e4nnu inte anv\u00e4nds korrekt. F\u00f6r att f\u00f6rst\u00e5 detta b\u00e4ttre kommer vi att diskutera den funktionella principen f\u00f6r en massluftfl\u00f6dessensor och de andra uppgifterna f\u00f6r moderna motorer.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Intressanta_fakta_om_luftmassesensor_funktionsprincipen\"><\/span>Intressanta fakta om luftmassesensor: funktionsprincipen<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>F\u00f6r optimal f\u00f6rbr\u00e4nning beh\u00f6vs syre ut\u00f6ver br\u00e4nsle. R\u00e4tt f\u00f6rh\u00e5llande avg\u00f6r kvaliteten p\u00e5 f\u00f6rbr\u00e4nningen \u2013 i princip p\u00e5 samma s\u00e4tt som en luftreglage p\u00e5 en braskamin anv\u00e4nds f\u00f6r att manuellt justera f\u00f6rbr\u00e4nningen. Bara det att med de erforderliga avgasv\u00e4rdena m\u00e5ste en riktigt perfekt f\u00f6rbr\u00e4nning ske, vilket motsvarar lambdav\u00e4rdet 1.<\/p>\n<p>Luftmassesensor \u00e4r integrerad i luftintaget nedstr\u00f6ms <a href=\"\/produkter\/luftfilter-11845\/\">luftfiltret <\/a>och framf\u00f6r <a href=\"https:\/\/www.motointegrator.se\/produkter\/gasspjaell-11833\/\">gasspj\u00e4llsventilen<\/a>. Vissa modeller har ocks\u00e5 en temperatursensor, medan andra massluftfl\u00f6dessensorer registrerar temperaturen direkt. Massluftfl\u00f6desgivarens sensor best\u00e5r av ett filmmotst\u00e5nd eller tv\u00e5 fina platinatr\u00e5dar. En av de tv\u00e5 ledningarna \u00e4r skyddad, den andra sticker ut i luftfl\u00f6det. Detta resulterar sedan i en temperaturskillnad och d\u00e4rmed ett annat motst\u00e5nd.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Sensorens_roll_vid_avgasrening\"><\/span>Sensorens roll vid avgasrening<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>MAF-givare g\u00f6r det m\u00f6jligt att m\u00e4ta den verkliga luftmassan, s\u00e5 att man ocks\u00e5 tar h\u00e4nsyn till de olika densiteterna vid olika temperaturer. Detta \u00e4r skillnaden mot de luftfl\u00f6desm\u00e4tare som anv\u00e4ndes tidigare, som bara kunde registrera den rena volymen, men inte syredensiteten. Dessutom beh\u00f6vs den inkommande luftmassan f\u00f6r att best\u00e4mma avgasreningen. I moderna fordon finns det inte bara en <a href=\"\/produkter\/lambdasonder-12114\/\">lambdasond<\/a> framf\u00f6r katalysatorn, utan \u00e4ven efter katalysatorn. Denna lambdasond nedstr\u00f6ms katalysatorn m\u00e4ter m\u00e4ngden syre efter katalysering. De v\u00e4rden som anv\u00e4nds avser den luftmassa som tidigare best\u00e4mts av sensor f\u00f6r massluftfl\u00f6de.<\/p>\n\n<h2><span class=\"ez-toc-section\" id=\"Symtom_pa_en_defekt_luftmassesensor\"><\/span>Symtom p\u00e5 en defekt luftmassesensor<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Fl\u00f6desgallret, som nu \u00e4r installerat framf\u00f6r MAF p\u00e5 vissa motorer (1,6 TDi) motorer, \u00e4r standard p\u00e5 m\u00e5nga andra motorer i alla fall. Gallrets bikakor lugnar luftturbulensen i intaget s\u00e5 att luften str\u00f6mmar j\u00e4mnare f\u00f6rbi m\u00e4ttr\u00e5den p\u00e5 massluftfl\u00f6dessensorn. Om massluftfl\u00f6dessensorn inte fungerar korrekt, dvs. har en defekt i andra fordon, kan det vara relativt sv\u00e5rt \u00e4ven f\u00f6r specialisten att identifiera defekten i LMM. Det beror p\u00e5 att symtomen kan yttra sig p\u00e5 helt olika s\u00e4tt. Typiskt f\u00f6r en felaktigt fungerande LMM skulle vara ett effektfall i mellanhastighetsomr\u00e5det, en spikning eller ryckning av motorn. Det talas om ett riktigt dragh\u00e5l, vilket leder till att vridmomentet ocks\u00e5 minskar kraftigt.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Testning_av_massluftflodessensorn_utan_hjalpmedel\"><\/span>Testning av massluftfl\u00f6dessensorn utan hj\u00e4lpmedel<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>I fordon som fortfarande \u00e4r utrustade med en f\u00f6rbrukningsdisplay, vilket var vanligt p\u00e5 1990-talet, kan defekten ocks\u00e5 manifestera sig i en helt ologisk br\u00e4nslef\u00f6rbrukning enligt f\u00f6rbrukningsdisplayen, eftersom massluftfl\u00f6dessensorn anv\u00e4nds f\u00f6r displayen. Massluftfl\u00f6dessensorn \u00e4r ocks\u00e5 sj\u00e4lvreng\u00f6rande.<\/p>\n<p>Innan varje motor startar v\u00e4rms den upp till cirka 1 000 grader Celsius s\u00e5 att smutspartiklar som f\u00f6rs in bokstavligen avdunstar. Om du tror att MAF-sensor \u00e4r defekt kan du ta ut den och f\u00f6rsiktigt reng\u00f6ra den med motorreng\u00f6ringsmedel eller bromsreng\u00f6ringsmedel. D\u00e5 skulle massluftfl\u00f6dessensorn beh\u00f6va fungera igen p\u00e5 kort sikt. Men inte permanent, eftersom den inte l\u00e4ngre reng\u00f6r motst\u00e5ndstr\u00e5den p\u00e5 grund av defekten.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Med_den_nya_programvaran_verkar_MAF_och_ECU_inte_kommunicera_ordentligt\"><\/span>Med den nya programvaran verkar MAF och ECU inte kommunicera ordentligt<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Men n\u00e4r du installerar den nya ECU-programvaran indikerar allt att de data som best\u00e4ms av massluftfl\u00f6dessensorn inte st\u00e4mmer \u00f6verens med kartorna i programvaran. Som om LMM inte fungerade, eftersom exakt dessa symtom uppst\u00e5r som med en defekt massluftfl\u00f6dessensor. \u00c5 andra sidan \u00e4r det fortfarande mycket m\u00f6jligt att en befintlig defekt i massluftfl\u00f6dessensorn nu kommer att bli synlig efter att den nya programvaran har installerats.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Volkswagen\u00a0har varit upptagen under de senaste m\u00e5naderna och har gjort n\u00f6dv\u00e4ndiga programvaru\u00e4ndringar f\u00f6r att kunna ers\u00e4tta den manipulerade versionen. M\u00e5nga fordon har redan f\u00e5tt uppdateringen, och skandalen verkar \u00e4ntligen bli lite mer hanterbar. Men dieselbilarna med de aktuella motorerna \u00e4r redan p\u00e5 tapeten igen. Effekt- och vridmomentsf\u00f6rlust i mellanhastighetsomr\u00e5det eller spikning och ryckning av deras [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":17538,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3354,382],"tags":[3658,3656,3659,3657],"class_list":{"0":"post-1469","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-karussell","8":"category-luftmasssensor","9":"tag-byta-luftmassesensor","10":"tag-defekt-luftmassesensor","11":"tag-luftmassesensor","12":"tag-symptom-pa-defekt-luftmassesensor"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Intressanta fakta om luftmassesensor<\/title>\n<meta name=\"description\" content=\"M\u00e5nga motorer beh\u00f6ver ett str\u00f6mningsgaller framf\u00f6r luftmassensor. 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