Exhaust gas depollution device for internal combustion engine, has thermal shield between tank and exhaust tube, and conduit closing unit including rotating cam whose axis is parallel to conduit axis, where cam is driven by stepper motor

摘要

#CMT# #/CMT# The device has an exhaust tube (1) for circulation of an exhaust gas of an internal combustion engine, and a venturi tube (2) placed inside the exhaust tube. A conduit (3) connects a depression zone of the venturi tube with a tank (4) containing a reducing agent e.g. fuel. A conduit closing unit has a rotating cam (6) whose axis is parallel to an axis of the conduit, where the cam is driven by a stepper motor (7). A thermal shield is placed between the tank and the exhaust tube. #CMT#USE : #/CMT# Device for depolluting an exhaust gas of an internal combustion engine (claimed). #CMT#ADVANTAGE : #/CMT# The rotating cam completely or partially closes an end of the conduit based on the desired quantity of fuel in order to guarantee precise dosing of the fuel, while ensuring reduced encumbrance. The thermal shield is placed between the tank and the exhaust tube so as to increase the thermal protection of the depollution device. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a schematic block diagram illustrating an exhaust gas depollution device. 1 : Exhaust tube 2 : Venturi tube 3 : Conduit 4 : Tank 6 : Rotating cam 7 : Stepper motor.