Exhaust System: Description and Operation
Exhaust System
The exhaust system not only ensures that pollutants are cleaned from combustion exhaust gases, it also has a significant effect on the acoustics of the vehicle. The exhaust system is made from stainless steel to be able to withstand the extreme conditions such as mechanical loads, severe changes in temperature and other environmental influences. Exhaust gases flow via two exhaust tracts from the respective exhaust manifold via the main catalytic converters, the front mufflers and the intermediate muffler to the rear muffler. They then escape via the tailpipe covers at the left and right.
Emission control
As a result of combustion of the fuel-air mixture, small quantities of pollutants (nitrogen oxides (NOx), hydrocarbons (HC), carbon monoxide (CO) and soot particles) are produced in addition to CO2 and water vapor. The Cayenne S Hybrid has two close-coupled main catalytic converters in order to achieve compliance with the strict worldwide emission standards.
This arrangement achieves faster heating up to the optimum operating temperature as well as a lower heat loss during the Start Stop phases.