method and device for influencing the co content in the exhaust gas of a diesel engine

摘要

The invention relates to a method and device for influencing the CO content of the exhaust gas of a spark ignition engine with carburettor. The blow-by gases coming from the crankcase are led into the clean air chamber (13) of an air filter connected upstream of the carburettor only at partial load and full load. When idling the blow-by gases are passed through an activated charcoal filter and then filtered together with the untreated air by the air filter element (12). At partial load and full load the activated charcoal filter (22) is cleaned by a secondary air flow parallel to the air flow in the air intake pipe (11) to the filter element (12). At partial load and full load, a secondary air flow is passed by way of a valve (24) through the activated charcoal filter (22) in order to clean this in this operating state. This method and the device permit an improved CO adjustment and a lower CO content of the exhaust gas. IMAGE