{"id":1357,"date":"2024-01-15T12:00:09","date_gmt":"2024-01-15T12:00:09","guid":{"rendered":"https:\/\/www.motointegrator.pt\/blog\/\/?p=1357"},"modified":"2025-01-21T09:57:36","modified_gmt":"2025-01-21T09:57:36","slug":"sensor-lambda-funcao-e-sintomas-de-avaria","status":"publish","type":"post","link":"https:\/\/www.motointegrator.pt\/blog\/sensor-lambda-funcao-e-sintomas-de-avaria\/","title":{"rendered":"Sensor Lambda: fun\u00e7\u00e3o e sintomas de avaria"},"content":{"rendered":"<p>Os motores modernos funcionam de forma muito econ\u00f3mica e com uma rela\u00e7\u00e3o ar-combust\u00edvel equilibrada, o que requer um sensor lambda. Uma falha do sensor lambda pode levar, entre outras coisas, a uma redu\u00e7\u00e3o do desempenho do motor ou a um aumento do consumo de combust\u00edvel.<\/p>\n<h2>Sensor lambda em ve\u00edculos modernos<\/h2>\n<p>Atualmente, \u00e9 importante atingir o menor consumo de combust\u00edvel poss\u00edvel com o maior desempenho poss\u00edvel do motor. Naturalmente, este objetivo s\u00f3 pode ser alcan\u00e7ado se o combust\u00edvel for utilizado da forma mais eficiente poss\u00edvel. Isto, por sua vez, requer uma combust\u00e3o \u00f3ptima do combust\u00edvel. Para tal, os gases de escape do motor devem ser analisados em pormenor.<\/p>\n<p>Nesta an\u00e1lise, o teor de oxig\u00e9nio nos gases de escape \u00e9 comparado com o do ar exterior. Consoante o teor de oxig\u00e9nio em quest\u00e3o ou o resultado da compara\u00e7\u00e3o, o <a href=\"\/produtos\/sondas-lambda-12114\/\">sensor lambda<\/a> gera uma tens\u00e3o el\u00e9ctrica que fornece dados de medi\u00e7\u00e3o importantes \u00e0 unidade de controlo do motor. Esta tens\u00e3o aumenta ou diminui consoante a rela\u00e7\u00e3o de mistura combust\u00edvel\/ar. Em fun\u00e7\u00e3o do valor da tens\u00e3o, a unidade de controlo do motor modifica a rela\u00e7\u00e3o combust\u00edvel\/ar, aumentando ou diminuindo o tempo de inje\u00e7\u00e3o dos injectores e ajustando assim a quantidade de combust\u00edvel.<\/p>\n<div class=\"cloud-zoom-lens\">\n<figure id=\"attachment_15864\" aria-describedby=\"caption-attachment-15864\" style=\"width: 300px\" class=\"wp-caption alignright\"><img decoding=\"async\" class=\"size-medium wp-image-15864\" src=\"https:\/\/www.motointegrator.pt\/blog\/wp-content\/uploads\/sites\/17\/2023\/12\/sensor-lambda-dox-300x300.jpg\" alt=\"Ajuste universal do sensor lambda DENSO DOX-0115\" width=\"300\" height=\"300\" \/><figcaption id=\"caption-attachment-15864\" class=\"wp-caption-text\"><a href=\"https:\/\/www.motointegrator.pt\/produto\/13297-ajuste-universal-do-sensor-lambda-denso-dox-0115\">Ajuste universal do sensor lambda DENSO DOX-0115<\/a><\/figcaption><\/figure>\n<\/div>\n<p>Este \u00e9 o chamado circuito de controlo. A unidade de controlo do motor utiliza o valor da tens\u00e3o, muitas vezes tamb\u00e9m conhecido como tens\u00e3o do sensor lambda, para reconhecer a composi\u00e7\u00e3o atual da mistura e ajusta-a continuamente. Se, por exemplo, a mistura for demasiado rica, ou seja, contiver demasiado combust\u00edvel, a quantidade de combust\u00edvel \u00e9 ligeiramente reduzida. Se, por outro lado, a mistura for demasiado pobre, a quantidade de combust\u00edvel \u00e9 aumentada. Atrav\u00e9s da regula\u00e7\u00e3o constante da quantidade de combust\u00edvel, a composi\u00e7\u00e3o da mistura pode ser sempre ajustada de forma \u00f3ptima.<\/p>\n<h2>Que fun\u00e7\u00e3o desempenha o catalisador do ve\u00edculo?<\/h2>\n<p>Para o <a href=\"\/produtos\/catalisadores-12113\/\">catalisador<\/a> do ve\u00edculo, a composi\u00e7\u00e3o \u00f3ptima da mistura \u00e9 muito importante. Uma boa rela\u00e7\u00e3o combust\u00edvel\/ar \u00e9 essencial para que o catalisador seja capaz de reduzir os gases de escape de forma \u00f3ptima. Isto s\u00f3 \u00e9 poss\u00edvel se o sistema de inje\u00e7\u00e3o funcionar corretamente. Da\u00ed a extrema import\u00e2ncia do sensor lambda. Uma mistura demasiado rica, por exemplo, reduz o desempenho do catalisador e pode mesmo danific\u00e1-lo a longo prazo. Al\u00e9m disso, uma mistura demasiado rica conduz naturalmente a um maior consumo de combust\u00edvel.<\/p>\n<figure id=\"attachment_15863\" aria-describedby=\"caption-attachment-15863\" style=\"width: 300px\" class=\"wp-caption alignleft\"><img decoding=\"async\" class=\"wp-image-15863 size-medium\" src=\"https:\/\/www.motointegrator.pt\/blog\/wp-content\/uploads\/sites\/17\/2023\/12\/sensor-lambda-300x200.jpg\" alt=\"Sensor Lambda defeituoso\" width=\"300\" height=\"200\" srcset=\"https:\/\/www.motointegrator.pt\/blog\/wp-content\/uploads\/sites\/17\/2023\/12\/sensor-lambda-300x200.jpg 300w, https:\/\/www.motointegrator.pt\/blog\/wp-content\/uploads\/sites\/17\/2023\/12\/sensor-lambda-1024x683.jpg 1024w, https:\/\/www.motointegrator.pt\/blog\/wp-content\/uploads\/sites\/17\/2023\/12\/sensor-lambda-768x512.jpg 768w, https:\/\/www.motointegrator.pt\/blog\/wp-content\/uploads\/sites\/17\/2023\/12\/sensor-lambda-1536x1024.jpg 1536w, https:\/\/www.motointegrator.pt\/blog\/wp-content\/uploads\/sites\/17\/2023\/12\/sensor-lambda-696x464.jpg 696w, https:\/\/www.motointegrator.pt\/blog\/wp-content\/uploads\/sites\/17\/2023\/12\/sensor-lambda-1068x712.jpg 1068w, https:\/\/www.motointegrator.pt\/blog\/wp-content\/uploads\/sites\/17\/2023\/12\/sensor-lambda-630x420.jpg 630w, https:\/\/www.motointegrator.pt\/blog\/wp-content\/uploads\/sites\/17\/2023\/12\/sensor-lambda.jpg 2048w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><figcaption id=\"caption-attachment-15863\" class=\"wp-caption-text\">\u00a9 Shutterstock \/ loflo69<\/figcaption><\/figure>\n<h2>Sintomas de um sensor lambda defeituoso<\/h2>\n<p>No entanto, deve ser feita uma distin\u00e7\u00e3o entre o sensor lambda a montante ou a jusante do conversor catal\u00edtico. As consequ\u00eancias de um sensor lambda defeituoso a montante do catalisador s\u00e3o mais graves do que as do outro tipo. Se o sensor lambda atr\u00e1s do catalisador falhar, o pr\u00f3prio controlo lambda continua a funcionar. Por conseguinte, \u00e9 efectuado um ajuste da mistura. Apenas os valores dos gases de escape ap\u00f3s o catalisador deixam de ser monitorizados, o que significa que a sua fun\u00e7\u00e3o j\u00e1 n\u00e3o pode ser determinada pela eletr\u00f3nica do motor.<\/p>\n<p>Se o sensor lambda antes ou depois do catalisador estiver defeituoso, \u00e9 normalmente poss\u00edvel continuar a conduzir sem problemas. No entanto, a falha n\u00e3o deve ser ignorada. Ali\u00e1s, o sensor em si nem sempre tem de estar defeituoso. Em determinadas circunst\u00e2ncias, \u00e9 poss\u00edvel que apenas um cabo se tenha soltado ou enferrujado. As liga\u00e7\u00f5es defeituosas das fichas tamb\u00e9m podem dar a falsa impress\u00e3o de que o sensor est\u00e1 defeituoso.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Os motores modernos funcionam de forma muito econ\u00f3mica e com uma rela\u00e7\u00e3o ar-combust\u00edvel equilibrada, o que requer um sensor lambda. Uma falha do sensor lambda pode levar, entre outras coisas, a uma redu\u00e7\u00e3o do desempenho do motor ou a um aumento do consumo de combust\u00edvel. Sensor lambda em ve\u00edculos modernos Atualmente, \u00e9 importante atingir o [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":15863,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3294,641,401],"tags":[3545,3544,3547,3548,3304,3546,3543],"class_list":{"0":"post-1357","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-automovel","8":"category-carrossel","9":"category-sensor-lambda","10":"tag-catalisador","11":"tag-efeitos-do-sensor-lambda","12":"tag-funcao-do-sensor-lambda","13":"tag-para-que-serve-o-sensor-lambda","14":"tag-sensor-lambda","15":"tag-sensor-lambda-avariado","16":"tag-sensor-lambda-defeituoso"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Sensor Lambda: fun\u00e7\u00e3o e sintomas de avaria<\/title>\n<meta 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