What is the purpose of adding urea to a vehicle?

[Sophia]

The purpose of adding urea to a vehicle: It is mainly used to treat exhaust gases and reduce pollutants in the emissions. Below is an extended explanation about adding urea to vehicles: 1. Only vehicles equipped with diesel engines require the addition of urea. Most vehicles that use diesel engines include buses, trucks, semi-trailers, and heavy-duty trucks, among others. 2. The working principle of a diesel engine differs from that of a gasoline engine. Diesel engines do not have spark plugs, so after the compression stroke ends, they do not rely on spark plugs to ignite the combustible mixture but instead rely on compression ignition. 3. After the compression stroke ends, the pressure and temperature of the combustible mixture are relatively high, allowing the mixture in diesel engines to self-ignite. Additionally, most diesel engines are equipped with turbocharging technology, providing relatively strong power, which necessitates the use of urea to treat the exhaust gases.