Robert Boschgmbh

Rainer Hoppel

Heinrich Knapp

Mathias Linssen

Manfred Lembke

Jurgen Peczkowski

A fuel supply system for internal combustion engines, in which a fuel injection valve is disposed upstream of a throttle device in an intake tube, from which valve a fuel stream which is asymmetrical relative to the throttle device emerges in order to influence the uniformity of mixture distribution to the cylinders of the engine. An asymmetrical fuel stream can be attained, by way of example, by inclining the fuel injection valve by a small angle (.alpha.) relative to the axis of the intake tube at the throttle device.

Fuel supply system

A control apparatus is proposed for a fuel metering system of an internal combustion engine having at least one additively functioning warmup enrichment circuit. The apparatus is characterized in that the additive enrichment can be reduced during overrunning. The purpose of this feature is to maintain the cleanest possible exhaust gas even during the warmup phase during overrunning. This is attained, for instance, by means of a logical linkage of an overrunning recognition signal and the output signal of an additively functioning correction circuit for the metering signal.

Control apparatus for a fuel metering system in an internal combustion

A fuel injection apparatus for externally ignited internal combustion gas engines is proposed. The fuel injection apparatus comprises an intake pipe in which an air flow meter and a throttle valve are provided. The fuel quantity injected into the intake pipe via an injection valve is controlled by the air flow meter. To prepare the combustible mixture of injected fuel and air, a preparation air line branches off from the intake pipe between the air flow meter and the throttle valve. This preparation air line discharges into the injection valve. A throttle is provided in the preparation air line. A full-load air line discharges into the preparation air line between the throttle and injection valve. A shut-off valve is provided in the full-load air line, said shut-off valve being completely open at least during the full-load operation of the combustion engine, allowing additional air flow into the preparation air line, which air is drawn from the intake pipe upstream of the air flow meter.

Fuel injection apparatus

A fuel injection valve is proposed which, especially in low-fuel-pressure systems, serves to inject fuel into the intake tube of a mixture-compressing internal combustion engine with externally supplied ignition. The fuel injection valve includes a fixed valve seat cooperating with a movable valve element, downstream of which the fuel to be injected is carried into a mixture guidance channel of a mixture guidance tube and surrounded on all sides with air or exhaust gas for preparation immediately upon its entrance into the mixture guidance channel and injected via an injection opening into the intake tube. The mixture guidance channel may be embodied as tapering in conical fashion toward the injection opening. For the purpose of preliminary preparation of the fuel, secondary air or exhaust gas can already be delivered to the fuel before its entrance into the mixture guidance channel. The fuel injection valve embodied according to the invention assures optimal preparation of the fuel to be injected, even at low fuel pressures, and good running behavior of the engine in the event of abrupt changes in load.

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Stuttgart, Germany

Rainer Hoppel