Filterwerk Mann + Hummel Gmbh

Rolf Fuesser

Rudolf Leipelt

Martin Weindorf

Arthur Klotz

Volker Ernst

Heinz Mueller

Hans-Joachim Esch

Heinz Andress

Helmut Spannbauer

Matthias Alex

Thomas Haubold

Robert Vaculik

Rolf Schirmacher

Franc Pricken

Georg Knoch

An air intake system for intake air of an internal combustion engine comprising a filter insert ( ) in a housing ( ) connected to the air conducting system by a plurality of inlets ( ) and an outlet ( ). The air inlets are provided with individual intake nozzles or fittings and lead to a single common air chamber ( ) in the filter housing. The inlets ( ) can be individually opened and closed by flap valves ( ), thereby allowing the acoustics to be influenced favorably and enabling, for example, the respective intake fittings to be connected or disconnected depending on the temperature. The intake system requires only a limited number of components, and the design of the preferably wedge-shaped air chamber minimizes flow losses in the housing, which in turn decreases the intake noise. Shunt resonators ( ) can also be formed using cover elements ( ) and ( ).

Air intake system with an air filter

A method and apparatus for actively influencing the intake noise of an internal combustion engine. The apparatus comprises a controller ( ) which senses the actual noise (I) via a microphone ( ) and compares the actual noise with a reference noise signal which depends on the engine speed D and at least one further engine parameter P, such as, for example, the throttle ( ) position. A comparison signal V generated by comparing the actual noise to the reference noise value is used to adjust a control signal A , which also depends on the engine speed D. The control signal is fed to an electromechanical transducer ( ) which generates a correcting noise ( ) which is superimposed on the intake noise ( ) to produce the resultant actual noise ( ), which should correspond as closely as possible to the reference noise value. The invention makes it possible to reduce the intake noise or to tailor the intake noise to a desired sound within the limits of the electromechanical transducer output so that, for example, a driver can be given an acoustic feedback under specified operating conditions.

Method and apparatus for actively influencing the intake noise of an internal combustion engine

An enclosure for an air aspirating machine, such as a compressor for a fuel cell drive , which represents a closed volume, so that said volume can be used acoustically for the air that is being drawn in. An air intake is extended into the enclosure , which is made of a sound damping and absorbing material , so that the resonant cavity acts as a series resonator. The air is drawn in via an air inlet of the compressor . Alternatively, the resonant cavity can also be used as a parallel resonator in that the intake path for the air is sealed within the enclosure and is provided only with sound communicating openings to the resonant cavity.

Enclosure for an air aspirating machine

The invention relates to a silencer. The silencer includes a sound conducting channel having two ends. An injection molded part is arranged between the two ends of the sound conducting channel and includes a plurality of pipe elements. A shunt resonator is arranged in fluid communication with the sound conducting channel by way of openings formed in the plurality of pipe elements. The shunt resonator defines a volume formed by two housing parts which are joined together. By varying the number, position, length and diameter of the pipe elements in the silencer, the silencer is capable of achieving silencing gains in different frequency ranges.

Silencer with a shunt resonator

Airflow device

Air intake system for an internal combustion engine

Intake system for an internal combustion engine

A tube, particularly suitable for use as a part of the intake manifold of an internal-combustion engine, having an inside diameter which can be changed as a function of the operating condition of the internal-combustion engine.

Tube with variable inside diameter

Intake manifold and process for making it

Growing community of inventors

Bad Herrenalb, Germany

Rolf Fuesser