Process and apparatus for purifying the exhaust gas of an internal combustion engine

摘要

Process for purifying internal combustion engine exhaust gases comprises determining the NO2 and C amounts in the gas, and increasing and/or decreasing the NO2 and C amounts in the gas on exceeding and/or falling below determined value regions so that the amounts lie in a determined NO2/C ratio. An Independent claim is also included for a device for purifying internal combustion engine exhaust gases comprising an air suction line (2) with a valve (13) extending to the engine; an injecting device (4); an exhaust gas line (3) extending from the engine and arranged in a particle filter (8); an electrical controller (16) for controlling the injection device and a NOx sensor (23) for determining the amount of NOx in the gas and a C sensor for determining the amount of C in the gas arranged in the exhaust gas line. Preferred Features: The exhaust gas pressure in the flow direction is determined before the particle filter (8) and the fuel/air ratio is reduced and adjusted to be richer.