noun (Automotive engineering: Vehicle components, Engine, transmission, and exhaust) Exhaust gas recirculation is the process of mixing exhaust gas with air taken in to make sure that all fuel is burned before entering the atmosphere. ⇒ The exhaust gas recirculation system helps to keep the emissions of the manual transmission model below the 150g/km level. ⇒ Exhaust gas recirculation involves recirculating a controllable proportion of the engine's exhaust back into the intake air. ⇒ Exhaust gas recirculation offers significant reduction in nitrogen oxide emissions from internal combustion engines.
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