It’s no secret that as cars and trucks age, their value decreases. A new filter from a car manufacturer can cost anywhere from $2,000 to $10,000. Replacing a diesel particulate filter can be pricey. How much does it Cost to Replace a Diesel Particulate Filter? Not all DPF systems have a parked regeneration feature. It’s critical for the driver or technician to ensure the exhaust outlets are directed away from structures, vegetation, trees, flammable materials and anything else that may be damaged or injured by exposure to high heat. The biggest sign to look for to determine if it is taking place is the high exhaust temp light, which will turn on once the aftertreatment doser starts to inject, increasing the temperature in the aftertreatment device. The exhaust gas temperature could reach 1500℉ (800℃).Īctive regeneration is unknown to the driver with the exception of some additional dashboard lamps. Active regeneration can occur automatically any time the vehicle is moving. The heat created from the fuel oxidizing is then used to convert soot to carbon dioxide.īoth active and passive regeneration happen automatically and without driver input. Once the soot level reaches a certain point, the engine injects fuel into the exhaust stream, which goes over the oxidation catalyst and oxidizes the fuel to create heat. For example, this may occur in a truck that’s not fully loaded. Active regeneration takes place when the engine isn’t creating the heat it needs. For example, a truck fully loaded with 80,000 pounds moving down the highway will create enough heat in the engine for a chemical reaction to occur-which is passive regeneration. Passive regeneration is part of normal engine operation, however active regeneration requires the engine to take action. ![]() All of these sensors indicate when the after-treatment system needs repair or maintenance. PM (particulate matter) sensors, also known as soot sensors, measure particulates in the exhaust (mainly ash and soot). Exhaust gas temperature sensors monitor the system temperatures. A differential pressure sensor estimates captured particles in the DPF. In addition to the primary components of the aftertreatment system, there are also sensors. The resulting ‘exhaust’ that gets reintroduced into the atmosphere is comprised of harmless nitrogen gas and water vapor. The DOC and DPF work together at the front end of the system to reduce carbon monoxide and hydrocarbons, but more importantly, capture soot and ash in the exhaust system to reduce the risk of those particles reaching the atmosphere.įrom there, the exhaust moves through a mixing chamber that introduces DEF … needed for the chemical reaction to reduce NOx in the SCR. SCR – This is the catalyst for the chemical reaction that transforms the combination of the exhaust stream and decomposed DEF to meet regulations for NOx emissions. DEF is introduced into the exhaust stream to reduce NOx emissions.ĭEF pump – A part of the DEF delivery system that vacuums DEF from the tank, through the pump, filters the DEF and primes and maintains pressure between the DEF pump and doser.ĭEF doser – The doser injects DEF into the exhaust system.ĭecomposition chamber – This assists in mixing the exhaust stream with DEF prior to the SCR. ![]() The SCR system consists of these components:ĭiesel Exhaust Fluid (DEF) – A solution made of urea and deionized water. The DPF system consists of the following:ĭiesel Oxidation Catalyst (DOC) – The DOC reduces particulate matter and oxidizes carbon monoxide and hydrocarbons.ĭPF – This filter is designed to remove more than 90 percent of particulates out of the exhaust. ![]() ![]() The primary components of a vehicle’s after-treatment system are the diesel particulate filter system (DPF), which reduces particulates, and the selective catalytic reduction system (SCR), which reduces nitrogen oxide (NOx).
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