Patent ID: 7100431
Filing Date: 2006-09-05
Classification: F02D,F02M,Y02T

Abstract:
1. A device for determining an exhaust gas recirculation rate (EGR) in an internal combustion engine, having an exhaust gas recirculation line ( 16 , 17 b ) extending to an intake line ( 14 ), said device comprising a sensor unit ( 12 ) with a first region exposed to an exhaust gas atmosphere in the exhaust gas recirculation line ( 16 , 17 b ) and a second region exposed to an exhaust gas/fresh air atmosphere in the intake line ( 14 ) of the internal combustion engine downstream of a location ( 17 c ) where the exhaust gas recirculation line ( 16 , 17 b ) joins said intake line ( 14 ), said sensor unit ( 12 ) being tubular and being disposed within the intake line ( 14 ) so as to extend therein axially spaced from the wall thereof, said sensor unit ( 12 ) being in communication with the exhaust gas recirculation line ( 16 ) and having an inner side ( 12 b ) exposed to the exhaust gas atmosphere and an outer side ( 12 a ) exposed to the exhaust gas/fresh air atmosphere.