Internal-combustion engines – Intake manifold – Manifold having plenum
Patent
1998-04-06
1999-07-13
McMahon, Marguerite
Internal-combustion engines
Intake manifold
Manifold having plenum
12318449, F02B 2700
Patent
active
059212128
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
An intake system for internal combustion engines with multiple cylinders, comprising a first air distribution chamber, one separate inlet pipe for each engine cylinder, which inlet pipes extend between the first distribution chamber and the respective inlet valve/valves of the corresponding cylinder, and a second air distribution chamber, which is connectable to each one of the inlet pipes between said first chamber and the inlet valves via a respective passage which passage can be opened by means of an operable valve, which valves are simultaneously operable between closed and open positions via control means with regard to the speed of the engine.
BACKGROUND OF THE INVENTION
EP 94850128.3 describes an active intake system for multiple cylinder combustion engines, comprising a first air distribution chamber, one separate inlet pipe for each engine cylinder, which inlet pipes extend between the first chamber and the respective inlet valve/valves of the cylinders. Also, there a second air distribution chamber which is connectable to each one of the inlet pipes between said first chamber and the inlet valves via a respective passage which passage can be opened by means of an operable throttle valve. The second chamber is connected to the first chamber via resonance pipes, the inlets to the second chamber being openable via a further throttle valve. This solution enables exploitation of the resonance frequency for an advantageous volumetric efficiency within the middle and upper engine speed ranges.
In many cases, it is desirable to instead provide a more advantageous volumetric efficiency within a lower range of engine speed. This is relatively simple to accomplish, but in that case it is normal to get a dip in the moment curve effecting the middle range of the engine speed. Such a dip is perceived by the driver of a vehicle, as if the engine lacks power in the middle range. Therefore, the normal driver tends to use unnecessary high revs in order to keep the engine out of the dip in the moment curve. This results in that the positive effect of the increased volumetric efficiency in reality disappears for these known arrangements.
THE TECHNICAL PROBLEM
The object of the present invention is therefore to provide an intake system which offers a more advantageous volumetric efficiency within a lower range of engine speed, without affecting the middle range of engine speed.
THE SOLUTION
This has been achieved according to the invention in that the second air distribution chamber receives inlet air via an adjustable throttle valve, in that the first air distribution chamber is divided into two volumes, being connectable via an additional openable valve, wherein each volume is connected to the second distribution chamber via at least one resonance pipe, and in that the valve of the first air distribution chamber is manoeuvrable between closed and open positions via control means with regard to the speed of the engine.
Advantageous variants of the invention are disclosed in the accompanying subclaims.
DESCRIPTION OF THE DRAWINGS
The invention will be described more in detail in the following, with reference to embodiments shown in the enclosed drawings, on which
FIG. 1 discloses schematically an intake system according to the invention, which is adapted to a six-cylinder combustion engine,
FIG. 2 is a diagram, which illustrates the technical effect of the intake system according to the invention,
FIG. 3 shows in the same manner as FIG. 1 an intake system which is adapted for a four-cylinder combustion engine, and
FIG. 4 shows an alternative design of the first air distribution chamber and the resonance pipes.
DESCRIPTION OF EMBODIMENTS
FIG. 1 discloses an intake system for a six-cylinder internal combustion engine 10. The intake system comprises an outlet spigot 11 from a not disclosed air filter housing. A throttle valve 12 is provided in the outlet spigot, for control of the flow volume of the filtered intake air.
The outlet spigot 11 opens out into an air distribution chamber 13 wh
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AB Volvo
McMahon Marguerite
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