How does an AdBlue injector work?

How does an AdBlue injector work?

Tiny amounts of AdBlue are injected into the flow of exhaust gases. At high temperatures AdBlue turns to ammonia and carbon dioxide. Inside the SCR (Selective Catalytic Reduction) catalyst, harmful nitrogen oxide in the exhaust reacts with the ammonia and is transformed to harmless nitrogen and water.

What is urea doser?

The Urea Doser System is a reductant delivery system that accurately injects a 32.5 percent solution of urea in water – also known as Diesel Exhaust Fluid (DEF) or AdBlue® – into the exhaust stream. When exposed to heat from the exhaust, the urea decomposes into ammonia.

What is a dosing module?

The dosing module is a component in the Bosch system that helps to reduce nitrogen oxide emissions in the exhaust system. Its job is to spray the urea-water solution into the exhaust system.

What will happen if urea gets dozed into the SCR below 180 deg C?

In well designed systems, urea injection may be possible at temperatures as low as about 180°C. However, even if complete decomposition of urea is ensured, prolonged SCR operation at low temperatures may result in the accumulation of other solid deposits, such as ammonium nitrate and/or ammonium sulfate.

Is NOx sensor part of AdBlue system?

Adblue Nox sensor issues with Audi Most people are unaware that the AdBlue system on most cars especially Audi uses the NOX sensor as an input to ascertain how much AdBlue is required to be injected. Once this sensor plays up you would most likely have the sensor replaced.

How does AdBlue reduce NOx?

AdBlue converts harmful NOx from your diesel vehicle exhaust into harmless nitrogen and steam, therefore considerably reducing the emissions of nitrogen oxides (NOx) that are a major source of atmospheric pollution and that lead to smog in urban centres.

How much urea is used in diesel engines?

Consumption of the urea solution is about 3% of the diesel consumption.

Where does AdBlue get injected?

exhaust pipe
AdBlue is injected from the vehicle’s dedicated AdBlue storage tank into the exhaust pipe, which is in front of the SCR catalyst, but downstream of the engine. As it is heated in the exhaust, the AdBlue changes into ammonia (NH₃) and carbon dioxide (CO₂).

What is a DEF dosing valve?

Diesel Exhaust Fluid (DEF) Dosing Valve Allows a fine mist of DEF to be sprayed into the exhaust stream of the Decomposition Reactor.

Does AdBlue remove all NOx?

When AdBlue fluid is injected into exhaust gases it can filter out more than 90% of the harmful gas emissions of nitrogen oxide (NOx) converting into steam and nitrogen, resulting in less pollution.

Do I need a NOx sensor?

NOx sensors are a must-have for diesel cars, so you should install them if you have a diesel car. When buying the units, ensure they are made by a reputable manufacturer.