Volkswagen Ag

Wolfgang Wehling

Klaus-Dieter Emmenthal

Otto Schafer

Uwe Waschatz

Rudolf-Helmut Strozyk

Detlef Pickert

Klaus Emmenthal

In the embodiments described in the specification pollutants in the exhaust gas of a multi-cylinder internal combustion engine of a motor vehicle having an exhaust-gas purification device containing a catalyst in the exhaust line are reduced by controlling The air/fuel ratio supplied to the cylinders of the internal combustion engine in such a way that at least one of the engine cylinders is operated with a lean air/fuel ratio and the remaining cylinders are operated with a rich air/fuel ratio while a lambda value of approximately one is maintained in the overall exhaust flow from all the cylinders. In addition to rapid heating of the catalyst in the exhaust-gas purification device and compensation for a relatively low storage capacity of the catalyst, this arrangement also reduces the quantity of untreated exhaust upstream of the catalyst.

Method for reducing pollutants in the exhaust gas of a multi-cylinder

Apparatus for the continuous injection of fuel into the intake piping of an internal combustion engine comprises an air pump for delivering an air stream portion deviated from the engine intake pipe, a fuel pump for delivering fuel from a source, a metering device controlled in response to operating conditions of the internal combustion engine and receiving fuel delivered by said fuel pump and the air stream portion delivered by said air pump for mixing said fuel and air stream portion and delivering the same to the intake piping of the engine, in which the supply of said air stream portion to the metering device is interrupted during an operating condition of the engine, preferably a coasting condition of operation of the engine. Interruption of the air stream portion may be effected by a shut-off valve in the conduit delivering the air stream portion from the air pump, responsive to a coasting condition of the engie. Alternatively, this may be accomplished by disabling the air pump during a coasting operation of the engine and enabling the air pump at the end of such operation.

Device for continuous fuel injection

Apparatus for continuously injecting fuel into the intake pipe of an internal combustion engine. The apparatus has an air channel branching off from the intake pipe at a point ahead of an adjustable throttle flap; a fuel metering device supplying fuel to the air channel in dependence upon engine load; and a fuel delivery pump arranged to receive a fuel-air mixture from the air channel through a narrowed constriction. The fuel delivery pump is constructed to convey fuel mixed with air even under conditions of maximum engine load. The fuel metering device has fuel exit openings which are directed toward the narrow constriction of the air channel forming the fuel delivery pump inlet.

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Brunswick, Germany

Wolfgang Wehling