DEF

Vehicle urea, commonly referred to as diesel exhaust fluid (DEF), is an essential component used in the selective catalytic reduction (SCR) systems of diesel vehicles. These systems are designed to reduce harmful emissions of nitrogen oxides (NOx), which contribute to air pollution and are regulated by emission standards in many countries.

The SCR technology works by injecting DEF into the exhaust stream of a diesel engine. DEF is a solution consisting of 32.5% high-purity urea and 67.5% deionized water. When the exhaust gases pass through the SCR catalyst, the DEF undergoes a chemical reaction with the nitrogen oxides present, converting them into harmless nitrogen gas and water vapor.

SCR systems

The purpose of using vehicle urea is to comply with emission regulations and improve air quality. Diesel engines, while efficient and powerful, produce higher levels of NOx compared to gasoline engines. SCR systems, with the help of DEF, enable diesel vehicles to meet stringent emission standards.

The usage of vehicle urea is not limited to any particular type of vehicle. It is employed in a wide range of diesel-powered vehicles, including cars, trucks, buses, commercial vehicles, construction machinery, agricultural equipment, and even marine vessels. These vehicles often have dedicated DEF tanks that store the fluid separately from the diesel fuel tank.

Tank

The DEF tank is typically located near the fuel tank, and it has a filler neck with a blue cap to distinguish it from the diesel tank. When the DEF level in the tank is low, the vehicle's onboard computer system sends a warning to the driver, indicating the need for a DEF refill. The DEF tank is designed to be easily accessible for refilling, either by the vehicle owner or at a service station.

The consumption rate of DEF varies depending on several factors, including the engine size, load conditions, and driving style. On average, it is estimated that a diesel vehicle will consume DEF at a rate of 2-4% of diesel fuel consumption. This means that for every 100 liters of diesel fuel burned, approximately 2-4 liters of DEF will be consumed.

To ensure optimal performance and emission control, it is crucial to use a high-quality DEF that meets the required specifications. DEF should meet the ISO 22241 standard, which guarantees its purity and effectiveness. It is available at various retail locations, such as service stations, auto parts stores, and authorized dealerships.

In conclusion, vehicle urea, or diesel exhaust fluid (DEF), is used in the SCR systems of diesel vehicles to reduce harmful NOx emissions. It is a crucial component in achieving compliance with emission regulations and improving air quality. DEF is used in a wide range of diesel-powered vehicles and can be obtained from authorized retailers.