Internal-combustion engines – Intake manifold – Manifold tuning – balancing or pressure regulating means
Patent
1999-03-02
2000-10-24
Argenbright, Tony M.
Internal-combustion engines
Intake manifold
Manifold tuning, balancing or pressure regulating means
12318453, 12318455, F02M 3510
Patent
active
061350796
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an air intake system for an internal combustion engine
BACKGROUND OF THE INVENTION
In internal combustion engines for motor vehicles, in order to achieve optimum performance, air intake systems are preferred which do not have a fixed air intake volume but permit adaptation to different operating requirements of the engine. Also, noise suppression is important in this regard.
In EP 0 569 714 A1 an air intake system is disclosed which, for purposes of noise suppression, provides in the air intake system an additional cavity through which the air does not flow. Two selectively connectable resonance tubes (interference tubes) are present which at certain rotational speeds of the internal combustion engine perform a damping of the objectionable sound frequencies.
Furthermore, an air intake system for an internal combustion engine is disclosed in German Offenlegungsschrift 40 41 786 in which a controllable shut-off device is present in order to vary the aperture through which the aspirated air flows.
The shut-off means is situated in a transverse passage between two intake passages and is opened or closed by operational commands from an electronic control. The operational commands depend on the speed of rotation of the internal combustion engine and on the temperature of the outside air, which is determined by a temperature sensor.
A disadvantage in the state of the art is that a not inconsiderable part of the air intake and/or suppressor volume is shut off or is not active in the intake of air. Due to the scarcity of the space available in the engine compartment of modern motor vehicles, this is disadvantageous.
SUMMARY OF THE INVENTION
The invention is addressed to the problem of improving an air intake system for an internal combustion engine according to the preamble of the main claim such that optimum operational conditions, and especially noise suppression conditions, will prevail under all states of operation of the internal combustion engine and within the space available in the engine compartment.
The air intake system according to the invention solves the stated problem by the features set forth in the body of the principal claim.
The air intake system according to the invention is advantageous because the total volume of the air intake system is always active, but the noise-suppressing action can be varied such that the optimum noise suppression can be spread out over several rotational speed ranges with varying effect.
With a tubular switch according to claim 2, the air intake tube can be opened in the noise suppression cavity in a simple manner. By the diffusion of the noise in the cavity a Helmholtz resonator defined by the cavity size becomes active, which promotes the diffusion of a specific sound frequency range and suppresses a different range. By a parallel connection of a branching tube (interference tube) according to claim 2, certain sound frequencies can be selectively suppressed due to interferences depending on the length of the branching tube.
By the arrangement of a supplemental channel according to claim 3, the noise suppression cavity can be connected across a large area to the air filter cavity, so that through this direct coupling an addition is made to the noise-suppression cavity by the air filter cavity which also has a noise-suppressing action. The so-called Helmholtz resonance is determined by the total volume of these cavities and has a correspondingly low frequency, which leads to a suppression of noise in the lower rotational speed range of the internal combustion engine.
The embodiment according to claim 4 describes the flexibility with which the desired sizes and physical properties of the cavities can be manipulated. Due to its flexibility of adaptation, this switching method achieves good acoustical properties in the internal combustion engine and the vehicle. The necessary switching can be achieved in a simple manner using the other units of a motor vehicle in accordance with claim 5. Complex and expensive additional equipment outside of
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Argenbright Tony M.
Filterwerk Mann & Hummel GmbH
Huynh Hai
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