GB2447035A - Intake plenum arrangement for a multi-cylinder internal combustion engine - Google Patents

Intake plenum arrangement for a multi-cylinder internal combustion engine Download PDF

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Publication number
GB2447035A
GB2447035A GB0704031A GB0704031A GB2447035A GB 2447035 A GB2447035 A GB 2447035A GB 0704031 A GB0704031 A GB 0704031A GB 0704031 A GB0704031 A GB 0704031A GB 2447035 A GB2447035 A GB 2447035A
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United Kingdom
Prior art keywords
plenum
connecting pipe
air
internal combustion
combustion engine
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Granted
Application number
GB0704031A
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GB2447035B (en
GB0704031D0 (en
Inventor
Richard John Pearson
Michael David Bassett
Allen Charles Bernard Saville
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Lotus Cars Ltd
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Lotus Cars Ltd
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Priority to GB0704031A priority Critical patent/GB2447035B/en
Publication of GB0704031D0 publication Critical patent/GB0704031D0/en
Publication of GB2447035A publication Critical patent/GB2447035A/en
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Publication of GB2447035B publication Critical patent/GB2447035B/en
Expired - Fee Related legal-status Critical Current
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B27/00—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues
    • F02B27/02—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues the systems having variable, i.e. adjustable, cross-sectional areas, chambers of variable volume, or like variable means
    • F02B27/0205—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues the systems having variable, i.e. adjustable, cross-sectional areas, chambers of variable volume, or like variable means characterised by the charging effect
    • F02B27/021—Resonance charging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B27/00—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues
    • F02B27/02—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues the systems having variable, i.e. adjustable, cross-sectional areas, chambers of variable volume, or like variable means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B27/00—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues
    • F02B27/02—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues the systems having variable, i.e. adjustable, cross-sectional areas, chambers of variable volume, or like variable means
    • F02B27/0226—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues the systems having variable, i.e. adjustable, cross-sectional areas, chambers of variable volume, or like variable means characterised by the means generating the charging effect
    • F02B27/0242—Fluid communication passages between intake ducts, runners or chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B27/00—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues
    • F02B27/02—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues the systems having variable, i.e. adjustable, cross-sectional areas, chambers of variable volume, or like variable means
    • F02B27/0226—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues the systems having variable, i.e. adjustable, cross-sectional areas, chambers of variable volume, or like variable means characterised by the means generating the charging effect
    • F02B27/0247—Plenum chambers; Resonance chambers or resonance pipes
    • F02B27/0252—Multiple plenum chambers or plenum chambers having inner separation walls, e.g. comprising valves for the same group of cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
    • F02M35/10026—Plenum chambers
    • F02M35/10032—Plenum chambers specially shaped or arranged connecting duct between carburettor or air inlet duct and the plenum chamber; specially positioned carburettors or throttle bodies with respect to the plenum chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
    • F02M35/10026—Plenum chambers
    • F02M35/10045—Multiple plenum chambers; Plenum chambers having inner separation walls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10242—Devices or means connected to or integrated into air intakes; Air intakes combined with other engine or vehicle parts
    • F02M35/10301—Flexible, resilient, pivotally or movable parts; Membranes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/104—Intake manifolds
    • F02M35/116—Intake manifolds for engines with cylinders in V-arrangement or arranged oppositely relative to the main shaft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10373—Sensors for intake systems
    • F02M35/1038—Sensors for intake systems for temperature or pressure
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Characterised By The Charging Evacuation (AREA)

Abstract

An intake plenum arrangement for an air intake system of a multi-cylinder internal combustion engine, eg a V6 or V8 engine, comprises first and second plenums 16,17 interconnected by a plenum connecting pipe 24. A first set of inlet runners 18,19,20 delivers charge air from the first plenum 16 to a first plurality of combustion chambers 10,11,12 while a second set of inlet runners 21,22,23 delivers charge air from the second plenum 17 to a second set of combustion chambers 13,14,15. The plenum connecting pipe 24 is provided with a cross-section adjusting mechanism 25 which can adjust in size the cross-sectional flow area of the pipe 24 and also a length adjusting mechanism 30 which can adjust the flow length of the pipe 24. A control system 25 is provided which controls the cross-section adjusting mechanism 25 and the flow length adjusting mechanism 30 in accordance with changes in engine speed and/or load, eg the cross-section is varied for engine speeds only in the range 2500 to 4500 rpm.

Description

--
AN INTAKE PLENUM ARRANGEMENT FOR A
MULTI-CYLINDER INTERNAL COMBUSTION ENGINE
The present invention relates to an intake plenum arrangement for a multi-cylinder internal combustion engine.
In many engines cylinders are arranged in a V configuration, with two banks of cylinders (e.g. a V6 engine, V8 engine etc). In such engines it is typical to use a dual plenum inlet manifold located in the valley of the engine. To improve the performance of such an engine it has been known to provide a plenum connecting pipe connecting the two different inlet plenums by a plenum connecting pipe. This pipe is of a fixed cross-sectional area and length.
In intake manifold systems for internal combustion engines it has been known to vary the cross-sectional area of inlet runners running from a plenum into the combustion chamber. An example of such an engine is shown in US2006/0054126 and US2005/0028778. A further example can be found in EP1540154A. It has also been proposed in the prior art to vary the effective length of the inlet runners running from a plenum to the combustion chambers, e.g. by valve arrangements as shown in EP1148217 and EP1220977.
Another example of this is shown in Us 5,762,036.
The mechanisms for varying inlet length or cross-sectional area of inlet runners are complex in nature and expensive to install. The dual plenum arrangement for a multicylinder internal combustion engine with a fixed geometry connecting pipe is inexpensive, but does not optimise engine performance over a range of engine speeds and loads.
The present invention provides in a first aspect an intake plenum arrangement for an air intake system of a multicylinder internal combustion engine comprising: first and second plenums; a plenum connecting pipe having an internal cross-sectional flow area and a flow length, which connects the first plenum with the second plenum; a first set of inlet runners delivering charge air from the first plenum to a first plurality of combustion chambers of the internal combustion engine and a second set of inlet runners delivering charge air from the second plenum to a second set of combustion chambers of the internal combustion engine, wherein: the plenum connecting pipe is provided with a cross-sectional area adjusting mechanism which can adjust in size the cross-sectional flow area of the plenum connecting pipe; and a control system is provided which controls the cross- section adjusting mechanism and varies in size the cross-sectional flow area of the plenum connecting pipe with changes in speed and/or load of the internal combustion engine.
The present invention provides in a second aspect an intake plenum arrangement for an air intake system of a multi-cylinder internal combustion engine comprising: first and second plenums; a plenum connecting pipe having a cross-sectional area and a length, which connects the first plenum with the second plenum; a first Set of inlet runners for delivering charge air from the first plenum to a first plurality of combustion chambers of the internal combustion engine; and a second set of inlet runners for delivering charge air from the second plenum to a second plurality of combustion chambers of the internal combustion engine; wherein: the plenum connecting pipe is provided with a length adjusting mechanism which can adjust the length of the plenum connecting pipe; and a control system is provided which controls the length adjusting mechanism and varies the length of the plenum connecting pipe with changes in speed and/or loads of the internal combustion engine.
A preferred embodiment of the present invention will now be described with reference to the accompanying drawings in which: Figure 1 is a schematic illustration of a first dual-plenum inlet manifold arrangement, according to the present invention, for use in a V6 engine; Figure 2 is a schematic illustration of a second dual-plenum inlet manifold arrangement according to the present invention, for use in a V6 engine; and Figure 3 is a schematic illustration of a third dual-plenum inlet manifold arrangement according to the present invention, for use in a V6 engine.
Turning first to Figure 1, there can be seen in the figure an air intake system for an internal combustion engine, shown schematically. The internal combustion engine is not shown in detail but there can be seen in the figure six combustion chambers of the internal combustion engine provided in two banks. The engine has a first bank of cylinders 10, 11, 12 and a second bank of cylinders 13, 14, 15. The engine is a V6 engine. Provided in the valley between the two banks of cylinders is a dual-inlet manifold plenum arrangement comprising two separate plenums 16 and 17. An air intake conduit 28 delivers air drawn in from atmosphere and passed through an air cleaner. The conduit 28 is branched to deliver air separately to the plenum 16 and to the plenum 17. Air from the plenum 16 is then delivered by inlet runners 18, 19 and 20 to the first bank of combustion chambers 10, 11 and 12. Air from the plenum 17 is delivered by inlet runners 21, 22, 23 to the combustion chambers 13, 14, 15 of the second bank of cylinders.
A plenum connecting pipe 24 connects the plenums 16 and 17. The plenums 16 and 17 are elongate, having first ends 1GA, 17A spaced from second ends 16B, 173 by a distance greater than the separation of side walls of the plenums.
The air conduit 17 is connected to the first ends 16A, l7A of the plenums 16, 17 and the plenum connecting pipe 24 connects second ends 163, 173 of the plenurns 16, 17. The plenum connecting pipe 24 is provided with a mechanism 25 for varying in size an internal cross-sectional flow area of the plenum connecting pipe 24. In the preferred embodiment shown the mechanism comprises an actuator 25 which can insert and withdraw a barrier 27 into and out of the plenum connecting pipe 24 to vary the cross-sectional area of the pipe 24.
By providing the plenum connecting pipe 24 and the mechanism 25 for varying in size its cross-sectional flow area, the resonant frequency of the inlet manifold system can be tuned to improve engine performance. The ability to vary in size the connecting pipe flow area allows the resonant frequency of the manifold system to be changed to better match different engine operating conditions at different engine speeds and loads. Thus the mechanism can be used to broaden the tuning range of the system.
An electronic controller 29 controls operation of the mechanism 25 via a control line 26. The controller 29 receives on line 50 an electrical signal indicative of depression in the plenums 16, 17, which indicates engine load, and an electrical signal on line 51, which indicates speed of revolution of the engine (e.g. from a sensor measuring crankshaft rotation). The controller 29 could be part of an engine management system. It varies in size the flow area of pipe 24 having regard to changes in engine speed and/or load.
In any multi-cylinder engine the inlet plenum pressure wave form can be approximated by a series of sinusoids. In the case of a dual plenum engine the firing order of the cylinders is preferably arranged so that the pressure waveform in one plenum e.g.16, is out of phase relative to the other plenum, e.g. 17. In such a case then when a pipe is connected between the two plenums 16 and 17 then the out-of-phase pressure excitation at the ends of the pipe 24 creates a flow oscillation within the gas in the pipe 24.
When the excitation frequency from the engine coincides with the fundamental frequency of the connecting pipe 24 and the manifold system as a whole then a strong excitation occurs which leads to improved engine volumetric efficiency and performance.
Where a fixed cross-sectional area plenum-connecting pipe 24 is used then tuning is limited to a relatively narrow engine speed range where the frequency of the manifold pressure variation coincides with the fundamental frequency of the connecting pipe 24. The ability to vary in size the flow area of the connecting pipe 24 allows the fundamental frequency of the pipe 24 to be adjusted with changes in engine speed.
The natural frequency of the connecting pipe 24 and the plenum system is a function of: where A is the cross-sectional flow area of the
VL pipe,
V is the plenum volume and L is the connecting pipe length.
Having the ability to vary the cross-sectional flow area A gives the facility for variation of the natural frequency of the connecting pipe and the plenum system and therefore enables a significant increase in volumetric efficiency of the engine over a broader range of operating speeds. Typically, the flow area will be varied between an area equivalent to that of a circular pipe having an internal diameter of 10mm and an area equivalent to that of a circular pipe having an internal diameter of 80mm.
Typically the cross-sectional area will be varied continuously between engine speeds of 2500 revolutions per minute and 4500 revolutions per minute, but kept constant outside this speed range.
An alternative approach of the present invention is shown in Figure 2. The Figure 2 system has many components in common with the Figure 1 system and identical components are given identical reference numerals.
The difference between the Figure 1 system and the Figure 2 system relates to the adjusting mechanism provided for the plenum connecting pipe 24. Whereas in Figure 1 the adjusting system 25 adjusts in size a cross-sectional flow area of the Plenum-connecting pipe 24, in Figure 2 the adjusting mechanism 30 varies in length the plenum connecting pipe 24. The adjusting mechanism 30 comprises two valves 31 and 32 between which extend two different pipe sections, a first pipe section 33 of a first length and a second pipe section 34 of a second, shorter length. The valves 31 and 32 can be operated so that air passing through the plenum connecting pipe 24 passes either along the shorter length passage 34 between the valves 31 and 32 or the longer length passage 33 between the valves 31 and 32.
In this way the length of the plenum-connecting pipe A can be altered and therefore the natural frequency of the connecting pipe and plenum system can be altered. The mechanism 30 is controlled by the electronic controller 29 having regard to engine speed and/or load.
Figure 3 shows a third variant of dual plenum inlet plenum arrangement according to the present invention. As with the preceding figures many parts are identical and are given the same reference numerals. The difference between the Figure 3 embodiment and the earlier embodiments is the provision for the connecting pipe 24 of both an adjusting mechanism 30 (as previously described with reference to Figure 2) which adjusts the length of the connecting pipe 24 and also an adjusting mechanism 25 (identical to that of Figure 1) which adjusts the cross-sectional flow area of the connecting pipe 24. In the Figure 3 embodiment both the length and the area of the plenum-connecting pipe 24 can be altered by controller 29 in order to give a greater range of variation of the natural frequency of the connecting pipe and plenum system.

Claims (9)

1. An intake plenum arrangement for an air intake system of a multi-cylinder internal combustion engine comprising: first and second plenums; a plenum connecting pipe having an internal cross-sectional flow area and a flow length, which connects the first plenum with the second plenum; a first set of inlet runners for delivering charge air from the first plenum to a first plurality of combustion chambers of the internal combustion engine; and a second set of inlet runners for delivering charge air from the second plenum to a second set of combustion chambers of the internal combustion engine; wherein: the plenum connecting pipe is provided with a cross-section adjusting mechanism which can adjust in size the cross-sectional flow area of the plenum connecting pipe; and a control system is provide which controls the cross- section adjusting mechanism and varies in size the cross-sectional flow area of the plenum connecting pipe with changes in speed and/or load of the internal combustion engine.
2. An intake plenum arrangement as claimed in claim 1 wherein: the plenum connecting pipe is additionally provided with a flow length adjusting mechanism which can adjust the flow length of the plenum connecting pipe; and the control system additionally controls the flow length adjusting mechanism and varies the flow length of the plenum connecting pipe with changes in speed and/or loads of the internal combustion engine.
3. An intake plenum arrangement for an air intake system of a multi-cylinder internal combustion engine comprising: first and second plenums; a plenum connecting pipe having a cross-sectional flow area and a flow length, which connects the first plenum with the second plenum; a first set of inlet runners for delivering charge air from the first. plenum to a first plurality of combustion chambers of the internal combustion engine; and a second set of inlet runners for delivering charge air from the second plenum to a second plurality of combustion chambers of the internal combustion engine; wherein: the plenum connecting pipe is provided with a flow length adjusting mechanism which can adjust the flow length of the plenum connecting pipe; and a control system is provided which controls the flow length adjusting mechanism and varies the flow length of the plenum connecting pipe with changes in speed and/or loads of the internal combustion engine.
4. An air intake system for a multi-cylinder internal combustion engine which comprises an intake plenum arrangement as claimed in any one of claims 1 to 3; an air inlet through which air is drawn from atmosphere; and an air cleaner through which air is passed as the air travels from the air inlet to the intake plenum arrangement; wherein the air intake system is branched downstream of the air cleaner with a first branch leading air to the first plenum and a second branch leading air to the second plenum.
5. An air intake system as claimed in claim 4, wherein: -11 -the first and second plenums are elongate, each having first and second ends spaced further apart than side surfaces; the first and second branches are connected to the first and second plenums at first ends thereof; and the plenum connecting pipe is connected to second ends of the first and second plenurns.
6. A multi-cylinder internal combustion engine having combustion chambers arranged in first and second sets in banks in a V-configuration and an air intake system as claimed in claim 4 or claim 5, in which the first and second plenums are located at least partly in a valley formed between the banks of combustion chambers.
7. An internal combustion engine as claimed in claim 6, which operates a firing order chosen such that consecutively firing combustion chambers are located in different banks.
8. An internal combustion engine as claimed in claim 7 wherein the connecting pipe is varied in cross-sectional flow between a flow area equivalent to that of a circular pipe of an internal diameter of 10mm and a flow area equivalent to that of a circular pipe of an internal diameter of 80mm.
9. An intake plenum system substantially as hereinbefore described with reference to and as shown in the r'company ng drawings. *..
* ** 902594; P.RIIB. SM * * * *1 *
S * *-S. * S.. *0S
9. An internal combustion engine as claimed in claim 7 or claim 8 wherein the cross-section is varied for changing engine speeds in the engine speed range 2500 revolutions per minute to 4500 revolutions per minute, and for lower and higher engine speeds remains constant.
10. An intake plenum system substantially as hereinbefore described with reference to and as shown in the accompanying drawings.
730546; AWP; CTF
AMENDMENTS TO THE CLAIMS HAVE BEEN FILED AS FOLLOW (3
C LA I MS
1. An intake plenum arrangement for an air intake system of a multi-cylinder internal combustion engine comprising: first and second plenums; a plenum connecting pipe having an internal cross-sectional flow area and a flow length, which connects the first plenum with the second plenum; a first set of inlet runners for delivering charge air from the first plenum to a first plurality of combustion chambers of the internal combustion engine; and a second set of inlet runners for delivering charge air from the second plenum to a second set of combustion chambers of the internal combustion engine; wherein: the plenum connecting pipe is provided with a cross-section adjusting mechanism which can continuously adjust in size the cross-sectional flow area of the plenum connecting pipe; and a control system is provided which controls the cross- * 20 section adjusting mecrianism and varies in size the cross-s sectional flow area of the plenum connecting pipe with * U..
changes in speed and/or load of the internal combustion engine; * wherein: S..
the plenum connecting pipe is additionally provided with a flow length adjusting mechanism which can adjust the ** flow length of the plenum connecting pipe; and the control system additionally controls the flow length adjusting mechanism and varies the flow length of the plenum connecting pipe with changes in speed and/or loads of the internal combustion engine.
2. An intake plenum arrangement as claimed in claim 1 wherein the two plenums are spaced apart and connected by the plenum connecting pipe, and each of the two plenums is supplied with charge air by an intake pipe individual to that plenum.
3. An air intake system for a multi-cylinder internal combustion engine which comprises an intake plenum arrangement as claimed in claim 1 or 2; an air inlet through which air is drawn from atmosphere; and an air cleaner through which air is passed as the air travels from the air inlet to the intake plenum arrangement; wherein the air intake system is branched downstream of the air cleaner with a first branch leading air to the first plenum and a second branch leading air to the second plenum.
4. An air intake system as claimed in claim 3, wherein: the first and second plenurns are elongate, each having first and second ends spaced further apart than side UL.LdLb; * *. ** S
* the first and second branches are connected to the first and second plenums at first ends thereof; and the plenum connecting pipe is connected to second ends of the first and second plenums.
5. A multi-cylinder internal combustion engine having combustion chambers arranged in first and second sets in banks in a V-configuration and an air intake system as claimed in claim 3 or claim 4, in which the first and second plenums are located at least partly in a valley formed between the banks of combustion chambers. ic
6. An internal combustion engine as claimed in claim 5, which operates a firing order chosen such that consecutively firing combustion chambers are located in different banks.
7. An internal combustion engine as claimed in claim 6 wherein the connecting pipe is varied in cross-sectional flow between a flow area equivalent to that of a circular pipe of an internal diameter of 10mm and a flow area equivalent to that of a circular pipe of an internal diameter of 80mm.
8. An internal combustion engine as claimed in claim 6 or claim 8 wherein the cross-section is varied for changing engine speeds in the engine speed range 2500 revolutions per minute to 4500 revolutions per minute, and for lower and higher engine speeds remains constant.
GB0704031A 2007-03-01 2007-03-01 An intake plenum arrangement for a multi-cylinder internal combustion engine Expired - Fee Related GB2447035B (en)

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GB0704031A GB2447035B (en) 2007-03-01 2007-03-01 An intake plenum arrangement for a multi-cylinder internal combustion engine

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Application Number Priority Date Filing Date Title
GB0704031A GB2447035B (en) 2007-03-01 2007-03-01 An intake plenum arrangement for a multi-cylinder internal combustion engine

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GB0704031D0 GB0704031D0 (en) 2007-04-11
GB2447035A true GB2447035A (en) 2008-09-03
GB2447035B GB2447035B (en) 2009-01-28

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