{"id":2589,"date":"2022-04-29T13:27:09","date_gmt":"2022-04-29T11:27:09","guid":{"rendered":"https:\/\/diy-leonmotors.de\/?p=2589"},"modified":"2024-07-15T10:22:50","modified_gmt":"2024-07-15T08:22:50","slug":"egr-valve-function","status":"publish","type":"post","link":"https:\/\/diy-leonmotors.de\/en\/agr-ventil-funktion\/","title":{"rendered":"EGR Valve Function & Build"},"content":{"rendered":"
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EGR Valve Function & Build<\/h1>
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Explaining how it works<\/p><\/div>\n<\/div><\/div>\n<\/div>\n<\/div><\/section>\n\n\n\n

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Home page<\/a><\/span> \" EGR Valve Function & Build<\/span><\/span><\/div><\/div>\n<\/div><\/section>\n\n\n\n
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The exhaust gas recirculation valve, or EGR valve for short, is an environmentally friendly function for reducing pollutants in vehicles. In principle, exhaust gases are removed from the combustion chamber immediately after the cylinders and mixed back into the intake air in certain situations. The EGR valve and the control system behind it regulate when and how much exhaust gas is allowed to pass through.<\/p>\n<\/div>\n<\/div><\/section>\n\n\n\n

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  1. 1) High-pressure EGR valve (HP EGR)<\/a>
  2. 2) The EGR cooler<\/a>
  3. 3) Cost of EGR valve & EGR cooler<\/a>
  4. 4) Low-pressure EGR valve (LP EGR)<\/a>
  5. 5) EGR valve for gasoline engines<\/a>
  6. 6) Check EGR valve function<\/a>
  7. 7) Causes of defective EGR valve<\/a>
  8. 8) The problem of exhaust gas recirculation & partial solution<\/a>
  9. More Articles<\/a><\/ol>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n<\/div><\/section>\n\n\n\n
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    1) High-pressure EGR valve (HP EGR) <\/h2>
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    To meet the Euro 5 emissions standard<\/strong> for passenger cars, the high-pressure EGR valve<\/strong> was developed and integrated into the air intake system.<\/p>\n\n\n\n

    \"Functional<\/a>
    Functional diagram of the high-pressure exhaust gas recirculation (EGR)<\/figcaption><\/figure><\/div>\n\n\n\n

    Exhaust gases from the combustion chamber are mixed with the cooled intake air from the turbocharger.<\/strong> The dosing is controlled by the high-pressure EGR valve.
    Through this technique, less oxygen enters the cylinders. Less oxygen causes a lower combustion temperature, which reduces nitrogen oxide emissions by up to 70%<\/strong>. The higher the temperature, the more harmful nitrogen oxides are produced.<\/p>\n\n\n\n

    EGR valves are available in different versions and designs:<\/span><\/p>\n\n\n\n

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    <\/a><\/path><\/svg><\/span>Pneumatically or electrically controlled<\/strong><\/span><\/div>\n\n\n\n
    <\/a><\/path><\/svg><\/span>For gasoline or diesel vehicles (gasoline or diesel engine)<\/strong><\/span><\/div>\n\n\n\n
    <\/a><\/path><\/svg><\/span>With connections for cooling<\/strong><\/span><\/div>\n<\/div><\/div>\n<\/div>\n<\/div><\/section>\n\n\n\n
    \"Function<\/a>
    Function EGR valve (high pressure)<\/figcaption><\/figure><\/div>\n\n\n\n
    \"Position
    Position of the EGR valve usually at the front of the engine block or to the left of the engine block<\/figcaption><\/figure><\/div>\n\n\n\n

    In diesel vehicles, control flaps<\/strong> are used to create the high pressure differential between the exhaust gases and the intake side. The mass air flow sensor<\/strong> monitors the regulation between the air mass and exhaust gases to indirectly calculate the recirculation rate.<\/p>\n<\/div>\n<\/div><\/section>\n\n\n\n

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    2) The EGR cooler<\/h2>
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    Since simple exhaust gas recirculation is no longer sufficient to meet the latest exhaust gas standards, EGR coolers are used. Cooled exhaust gas lowers the combustion temperature even further.
    This results in significantly fewer nitrogen oxides.<\/p>\n\n\n\n

    EGR coolers, like all components in the EGR system, are exposed to the conditions of exhaust gas condensation and temperature<\/strong>. Therefore, the coolers must be made from corrosion-resistant materials<\/strong>.
    Many coolers today are equipped with a bypass valve. This is used to prevent the hot exhaust gases from cooling down during the warm-up phase.<\/p>\n\n\n\n

    \"EGR
    Structure of EGR cooler with EGR valve<\/figcaption><\/figure><\/div>\n<\/div>\n<\/div><\/section>\n\n\n\n
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    3) Cost of EGR valve & EGR cooler <\/h2>
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    The high-quality workmanship of the EGR cooler leads to a hefty price. An EGR cooler for a mid-range car can cost up to 750\u20ac<\/strong>. In contrast to the cooler, the EGR valve itself costs only between 50\u20ac \u2013 200\u20ac.<\/strong>
    The EGR valve and the cooler are usually bolted together.<\/strong> If only one of these components is defective, the entire assembly usually needs to be replaced. Over time, the cooler and valve can \"fuse\" together and can be difficult to separate. To prevent permanent damage, we recommend replacing both the valve and the cooler.<\/strong><\/p>\n\n\n\n

    \"Illustration
    Try separating the EGR cooler from the EGR valve<\/figcaption><\/figure><\/div>\n<\/div>\n<\/div><\/section>\n\n\n\n
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    4) Low-pressure EGR valve (LP EGR)<\/h2>
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    To meet the emission limits starting from the Euro 6 emissions standard, the previous high-pressure exhaust gas recirculation system is no longer sufficient.
    An additional low-pressure EGR system, abbreviated ND-EGR, is required.<\/strong>
    The low-pressure system is installed in vehicles from approximately 2015 onwards and is located near the catalytic converter.<\/p>\n\n\n\n

    \"Functional<\/a>
    Function EGR valve (high pressure + low pressure)<\/figcaption><\/figure><\/div>\n\n\n\n

    In this process, the exhaust gas is taken from the low-pressure side behind the particulate filter and reintroduced before the compressor of the turbocharger<\/strong>. The dosage is controlled by the low-pressure EGR valve. An exhaust flap provides the necessary exhaust backpressure. This method continues to reduce nitrogen oxides. The combination of the high-pressure and low-pressure EGR systems achieves nearly a 90% reduction in nitrogen oxides<\/strong> in diesel vehicles. Filters before the exhaust (e.g., catalytic converter, DPF, etc.) also contribute to this.<\/p>\n<\/div>\n<\/div><\/section>\n\n\n\n

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    5) EGR valve for gasoline engines<\/h2>
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    EGR valves for gasoline engines work fundamentally the same as in diesel engines<\/strong>. The created vacuum draws in the exhaust gases and is regulated by the exhaust gas recirculation valve. However, in gasoline engines, the main objective is to reduce fuel consumption<\/strong>. The three-way catalytic converter, which is only installed in gasoline engines, does most of the work regarding nitrogen oxide reduction. Additionally, carbon buildup or soot formation in the EGR valve is eliminated in gasoline engines<\/strong>, which often causes failure in diesel engines.<\/p>\n\n\n\n

    The first EGR systems were even first used in petrol vehicles in the 1970s. This technology was only introduced for diesel cars in the 1990s.<\/p>\n<\/div>\n<\/div><\/section>\n\n\n\n

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    6) Check EGR valve function<\/h2>
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    In principle, the EGR valve can be checked for gasoline and diesel engines using the same procedure:<\/span><\/p>\n\n\n\n

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    <\/a><\/path><\/svg><\/span>1) With the engine switched off, use the hand pump to create a vacuum of 500 mbar<\/strong> (300 mbar for gasoline engines) at the valve.<\/span><\/div>\n\n\n\n
    <\/a><\/path><\/svg><\/span>2) Hold the vacuum for approx. 4-5 minutes. This must not fall off in the meantime.<\/strong><\/span><\/div>\n\n\n\n
    <\/a><\/path><\/svg><\/span>3) Repeat the procedure with the engine running and at operating temperature.<\/span><\/div>\n\n\n\n
    <\/a><\/path><\/svg><\/span>4.) From a pressure difference of approx. 300 mbar<\/strong> the engine should start to stall or switch off completely when idling.<\/span><\/div>\n<\/div><\/div>\n<\/div>\n<\/div><\/section>\n\n\n\n

    If the negative pressure generated drops too quickly or the idling does not deteriorate, there is a defect in the exhaust gas recirculation system.<\/strong><\/p>\n\n\n\n

    This method only works with pneumatically or electro-pneumatically controlled EGR valves<\/strong>. For purely electric EGR valves in newer vehicles, the most sensible method of testing is with a diagnostic tool<\/strong>. If you don't find a vacuum actuator in the engine bay, you most likely have a purely electric control system.<\/p>\n<\/div>\n<\/div><\/section>\n\n\n\n

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    7) Causes of defective EGR valve<\/h2>
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    The most common cause in a diesel vehicle is a carbonized and clogged EGR valve due to soot.<\/strong><\/p>\n\n\n\n

    \"Appearance
    Coked EGR valve on diesel vehicle (soot formation)<\/figcaption><\/figure><\/div>\n\n\n\n

    In most cases, it is sufficient to remove and clean the EGR valve.<\/strong><\/p>\n\n\n\n

    Other possible causes or diagnoses are<\/span><\/p>\n\n\n\n

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    <\/a><\/path><\/svg><\/span>It will Not enough negative pressure<\/strong> generated (leak in the hoses, vacuum pump\/can defective)<\/span><\/div>\n\n\n\n
    <\/a><\/path><\/svg><\/span>Mass air flow sensor defective (provides no or incorrect values)<\/span><\/div>\n\n\n\n
    <\/a><\/path><\/svg><\/span>Defective Thermovalve<\/strong> or defective Pressure transducer<\/strong> on the valve (provides no or incorrect values)<\/span><\/div>\n\n\n\n
    <\/a><\/path><\/svg><\/span>Defective engine control unit or with \"software optimization\" on the Forgetting to adjust the exhaust gas recirculation<\/strong><\/span><\/div>\n\n\n\n
    <\/a><\/path><\/svg><\/span>Corroded contacts or Interruption in the cabling<\/strong> to the pressure transducer, mass air flow sensor or thermovalve<\/span><\/div>\n<\/div><\/div>\n<\/div>\n<\/div><\/section>\n<\/div>\n<\/div><\/section>\n\n\n\n
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    8) The problem of exhaust gas recirculation & partial solution<\/h2>
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    The exhaust gas recirculation is primarily good for the environment, but bad for the engine technology<\/strong> itself. When exhaust gases are recirculated into the engine compartment, significant carbon buildup occurs in the intake tract of diesel engines. The \"soot layer\" can even become so thick that the diameter of the pipes, and thus the airflow, is reduced.<\/p>\n\n\n\n

    Theoretically, you can solve the problem by deactivating the EGR valve<\/strong> (keeping the EGR permanently closed). However, deactivating it is illegal and counterproductive in terms of environmental protection.<\/strong><\/p>\n\n\n\n

    Alternatively, with the right driving style and maintenance, you can minimize carbon buildup and<\/strong> preserve the EGR valve.<\/a><\/strong><\/span>
    Regardless, you should occasionally clean the EGR valve<\/strong>. Every 80,000 km is a good interval. This will help prevent carbon buildup and subsequent damage.<\/p>\n\n\n\n

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    Das Ventil zur Abgasr\u00fcckf\u00fchrung, kurz AGR-Ventil, ist eine umweltschonende Funktion zur Reduzierung der Schadstoffe bei Fahrzeugen. Prinzipiell werden Abgase unmittelbar nach den Zylindern aus dem Verbrennungsraum entnommen und der Ansaugluft in bestimmten Situationen wieder beigemischt. Das AGR-Ventil und die Steuerung dahinter regelt wann und wie viel Abgas durchkommen darf. 1.) Hochdruck AGR-Ventil (HD-AGR) Zur Erf\u00fcllung […]<\/p>\n","protected":false},"author":1,"featured_media":2618,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[7],"tags":[68,73,65,64,71,67,70,74,69,75,72,66],"class_list":["post-2589","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-wissen-tipps","tag-abgasrueckfuehrung","tag-agr-stilllegen","tag-agr-ventil","tag-agr-ventil-funktion","tag-funktion-pruefen","tag-funktionsbeschreibung-agr","tag-hd-agr","tag-luftmassenmesser","tag-nd-agr","tag-russbildung-agr","tag-ursachen-defekte-agr","tag-verkokung"],"yoast_head":"\nAGR-Ventil Funktion & Aufbau | DIY-Leonmotors<\/title>\n<meta name=\"description\" content=\"Die AGR-Ventil Funktion ist die Reduzierung der Schadstoffe beim Auto. Abgase vom Motor werden entnommen und der Ansaugluft beigemischt.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/diy-leonmotors.de\/en\/egr-valve-function\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"AGR-Ventil Funktion & Aufbau | DIY-Leonmotors\" \/>\n<meta property=\"og:description\" content=\"Die AGR-Ventil Funktion ist die Reduzierung der Schadstoffe beim Auto. 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