kipufogógázújrahasznosítás

The term "kipufogógáz-újrahasznosítás" is a Hungarian phrase that translates to "exhaust gas recycling" in English. This technology is a crucial component of modern internal combustion engines, particularly in gasoline-powered vehicles, and is commonly known as Exhaust Gas Recirculation (EGR). The primary purpose of EGR is to reduce the formation of nitrogen oxides (NOx), which are harmful pollutants contributing to smog and acid rain.

Exhaust gas recirculation works by diverting a small portion of the exhaust gas back into the engine's intake manifold. When mixed with the fresh air-fuel mixture, the inert exhaust gas lowers the combustion temperature within the cylinders. High combustion temperatures are a key factor in the formation of NOx. By reducing these temperatures, EGR significantly limits the amount of NOx produced.

There are two main types of EGR systems: positive-back pressure EGR and negative-back pressure EGR. Positive-back pressure systems use a valve to create back pressure in the exhaust manifold, forcing exhaust gas into the intake. Negative-back pressure systems, also known as exhaust gas recirculation control systems, use a vacuum-operated diaphragm or an electronic motor to control the amount of exhaust gas recirculated.

While EGR is effective in reducing NOx emissions, it can sometimes lead to a slight decrease in fuel efficiency and performance, as well as increased carbon deposits in the intake system. Modern vehicles often incorporate sophisticated electronic control units (ECUs) to manage the EGR system precisely, optimizing emissions reduction while minimizing adverse effects on engine operation.