Internal-combustion engines – Intake manifold – Manifold tuning – balancing or pressure regulating means
Patent
1999-05-26
2000-08-22
McMahon, Marguerite
Internal-combustion engines
Intake manifold
Manifold tuning, balancing or pressure regulating means
F02B 2702
Patent
active
061055468
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an intake system for an internal combustion engine.
DE OS 42 16 255 discloses an intake tube for an internal combustion engine. This intake tube is comprised of a number of individual intake tubes which are connected at the inlet end to a manifold tube. The intake tube is made in one piece and manufactured by the blow molding method. Between two individual intake tubes a shunt resonator is provided. This is a short tube section which produces a cancellation of sound waves of a specific frequency. The length of the tube section is to be tuned to the sound waves and amounts to .lambda./4. It is also possible to connect this shunt resonator with a clean air chamber of the air filter housing. However, an arrangement as close as possible to the sound source is preferred. The disclosed shunt resonator is effective at a specific frequency, i.e., thus also at a specific speed of the internal combustion engine. Thus, if undesired sound waves are to be masked out in various speed ranges of the internal combustion engine, it would be conceivable to arrange for a plurality of shunt resonators and tune them to the corresponding frequencies. This, however, requires a considerable amount of space.
SUMMARY OF THE INVENTION
It is the object of the invention to avoid the aforementioned disadvantages and provide an intake system for an internal combustion engine which has a shunt resonator which is effective over a broad frequency spectrum, while having a volume or requiring little space.
This object is achieved by an intake system as described hereinafter. The substantial advantage of the invention is that the factors relevant to frequency are made variable and thus it is possible to adapt the shunt resonator to the motor speed in a continuous or discontinuous manner. This adaptation is performed, for example, with dampers which close certain tubes or by means for varying the cross section of tubes, such as throttles operating steplessly, for example. It is also possible to vary the length of tubes by means of a telescoping configuration.
In accordance with one embodiment of the invention it is proposed also to make the resonator volume variable. This is variable, for example, by dividing a large volume into a plurality of partial volumes and opening and closing these partial volumes. The size of the shunt resonator can be varied in a simple manner depending on the rotational speed and/or depending on the load state of the internal combustion engine. For this purpose, appropriate speed sensors and sensors for measuring the vacuum in the intake manifold in order to determine the load state can be used.
To increase the effect of a shunt resonator, it is proposed in accordance with another embodiment of the invention to divide the main flow duct into segments and especially in the low-frequency range to shut off one segment, i.e., one part of the main duct.
One embodiment of the invention envisions that a first neck, commencing from the main duct, extends into the cavity of the shunt resonator, and a second neck having a multiple of the cross section of the first neck, is likewise connected to the main duct and the cavity of the shunt resonator. In different frequency ranges it is possible by means of suitable dampers to open or close both necks or only one neck.
It is proposed in a further embodiment to provide an additional neck with a narrow cross section but with twice the length of the first neck. This neck too can be equipped with a damper and serves to suppress particularly low frequencies in the 50 Hz range.
In accordance with a further embodiment of the invention it is proposed to attach several adjusting dampers on a single shaft. This has the advantage that only one or two actuators are necessary for the operation of the dampers.
These and other features of preferred embodiments of the invention will be found not only in the claims but also in the description and the drawings, it being possible for the individual features to be realized individually or togethe
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Esch Hans-Joachim
Fuesser Rolf
Filterwerk Mann & Hummel GmbH
McMahon Marguerite
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