The principal function of the exhaust gas recirculation ‘EGR system’ is to reduce the amount of nitrogen oxides, also called NOx or pollutants, that are produced during the combustion process.
Today, 100 % of the Diesel cars are equipped with EGR valves and currently only 30 % of petrol cars. Since Euro 5, most of the new petrol cars in the market are/will be equipped with an EGR system. New models will be equipped with two EGR types (low pressure and high pressure).
100% of diesel engines in Europe are fitted with an EGR valve
Reduces pollutants to meet Euro norms
60% market coverage – and growing
Comprehensive technical support
Nitrogen oxides (NOx) are produced during the combustion process. NOx is created when high combustion temperatures enable the nitrogen and oxygen present in the air-fuel mixture to combine. To reduce these harmful emissions the EGR valve takes exhaust gases from the exhaust manifold and reintroduces them into the intake manifold, mixing them with fresh air. This has a double effect, reducing the amount of oxygen in the air-fuel mixture and reducing the temperature, and thereby reducing the amount of NOx the engine produces.
Achieving the “right” level of return gas is governed by the Engine Management System (EMS) which measures various inputs e.g. engine load, engine speed, boost pressure, mass air flow rate, intake air temperature.