A diesel exhaust system is a very important part of your vehicle. It routes exhaust gas from the engine and exhausts it into the environment while at the same time providing noise attenuation as well after-treatment of the exhaust gas in order to reduce emissions. An important source of vehicle noise (the noise associated with exhausting combustion gases from the engine) is controlled by the use of mufflers. There are a number of sound reduction techniques that are employed in mufflers, including reactive silencing, absorptive silencing, resistive silencing as well as shell damping.
Originally, a diesel exhaust system was designed to safely route exhaust gases from the engine in order to allow them to be exhausted into the environment while at the same time providing attenuation of combustion noise. However, exhaust gas, contains components that are harmful to human health as well as the environment. Due to this, there was a need to regulate the emission levels of these exhaust gas components.
Because regulated emission levels are usually much lower compared to that which can be achieved through in-cylinder control measures, it is important for the exhaust gas to be treated after it leaves the engine. Thus, even though the diesel exhaust systems continue serving the original functions that they were designed for, they have since evolved into one of the critical elements used for pollution control as well as abatement in modern engines.
An exhaust system from a diesel car is typically connected to the exhaust manifold, whose work is to collect exhaust gases from the engine cylinders’ exhaust ports. When it comes to light-duty applications, catalytic converters and diesel particulate filters can be placed either in the close-coupled position to the exhaust manifold or in the underfloor position. Choice of location is often determined by the availability of space as well as the desired temperature profile