EGR

Am un Astra G, 2003, 5usi, 2.0 DTI 16V, Y20DTH si am probleme cu EGR-ul vreau sa stiu daca se poate repara deoarece unul nou este cam 17mil

Multumesc pentru raspuns! Intr-o dimineata nu a vrut sa se mai accelereze, am fost la servis si au spus ca axa de la EGR s-a blocat si nu a mai revenit la pozitie.Aceasta se explica datorita uzurii.Au curatat EGR si vad ca nu mai sunt probleme, dar au facut recomadarea sa-l schimb.

legat de rolul egr-ului la diesel-uri: http://www.dieselnet.com/tginfo/abstracts.html

Si anume un pasaj
"Exhaust Gas Recirculation
Exhaust gas recirculation (EGR) is an effective strategy to control NOx emissions from diesel engines. The EGR reduces NOx through lowering the oxygen concentration in the combustion chamber, as well as through heat absorption. Several configurations have been proposed, including high- and low-pressure loop EGR, as well as hybrid systems. NOx emissions may be further reduced by cooled EGR, in which recirculated exhaust gas is cooled in an EGR cooler using jacket water. Drawbacks of EGR include increased PM emissions and fuel consumption.

EGR Systems & Components
EGR systems have been commercialized as a NOx reduction method for both light- and heavy-duty diesel engines. The main components of EGR systems are EGR valves and EGR coolers. Production style EGR systems utilize electronic EGR control, in open or closed loop control layout, which has to provide precise EGR rates and proper A/F ratios in order to achieve their NOx reduction targets while minimizing PM and fuel economy penalty. Even more precise A/F ratio control is possible with variable geometry turbochargers and electrically driven chargers. EGR systems have to be also designed to minimize the potential engine durability issues."