DE4447832B4 - Air inlet system for IC engine - has adjacent airflow chambers connecting air entry to suction pipes - Google Patents

Abstract

An air supply system for a multi-chamber (12) IC engine comprises an air entry section (7) and a suction pipe (10) assembly, directing airflow to the combustion chambers. At least two airflow chambers (9) connect the air entry to the suction pipes, which are located adjacent to each other. The airflow chambers are separated by a common wall (11), and connected by a hole in this wall. One of the chambers has a longitudinal wall, which separates at least one of the chambers into two longitudinal sections.

Description

The The present invention relates to an air intake system via the combustion chambers an internal combustion engine air and fuel is supplied.

In such air intake systems determine the size, the Shape and configuration of the air intake pipes not only the Rate with which the intake air into the combustion chambers of the engine flows, but also the resonance frequency of the system. The latter parameter is especially important when the engine is designed for resonance charging is in which is advantageous, an arrangement for the modification of Provide the resonant frequency of the system to the resonant frequency to adapt to the speed of the engine. It is also important to have such air intake systems as simple and as compact as possible form so that the for their assembly required space is reduced, which in turn results in the construction the engine compartment of the motor vehicle allows greater freedom.

From JP-4 175 465-A (and corresponding patents US 5,003,933 U.S. Patent Nos. 5,094,194; 5,150,669; 5,261,272; US 5,261,375 ) is an air intake system for internal combustion engines is known, which is compact out as a unit with a collector portion and a separate intake section. However, an injector, a throttle, an intake air flow sensor, and an air intake portion are provided separately. This arrangement can not be efficiently assembled and assembled because the injector, the throttle, the intake air flow sensor, and the air intake section must be separately mounted.

The DE 40 28 443 A1 describes an intake manifold for supplying the combustion chambers with air in which different Saugrohrlängen and volumes are switched for resonance or vibration charging. The intake manifold has a collecting tube which is connected to the air inlet portion of the cylinder via individual tubes which converge to form a common single tube. Before the mouth point at which converge the individual tubes, a throttle flap mechanism is mounted in each case a single tube.

In the US 4,875,438 For example, an intake body is shown with an intake section for splitting the intake air for the respective cylinders of the engine. The inlet body is connected to a distribution chamber via an intermediate portion in which a throttle mechanism is arranged.

task the invention is to provide an air intake system for internal combustion engines, that simple, functional and economical is trained.

These The object is achieved by an air intake system for internal combustion engines, having the features specified in claim 1.

In the air intake system according to the invention flows which occurred in an air intake Air through an intake air flow sensor and a throttle valve in a separate passage section. From here flows through a collecting section into an intake passage section, the respective cylinders corresponding, separate intake pipes owns, and then into the engine combustion chambers.

to Achieving a compact construction are the passage section, the collector section and the Ansaugrohrabschnitt arranged side by side and directly or via a partition connected to each other. In the downstream of the air inlet section is located passage a control unit mounted to control the engine.

According to the present Invention is the entire air intake system, which consists of the air intake section, the intake ducts and the like, is made compact, so that the engine compartment can be efficiently exploited.

There the passages using partitions are formed to the parts described above side by side to be able to order Is it possible, that this Air intake system is compact and does not take up too much space requires.

The dependent claims are on preferred embodiments directed to the present invention.

Further Objects, features and advantages of the invention will become apparent in Reading the following description of preferred embodiments, referring to the drawings; show it:

1 a cross-sectional view of a built-in a V-engine air intake system for internal combustion engines for explaining the present invention;

2 a longitudinal sectional view of the air intake system of 1 ;

3 . 4 Views for explaining the attachment of an intake pipe;

5 . 6 Views for explaining the air flow in the intake manifold;

7 . 8th Views explaining the resonance principle in the intake manifold;

9 the construction of a Verwirbelungsleitung;

10 the swirl valve;

11 the flow divider valve section;

12 the construction of the flow divider valve shaft coupler section;

13 a longitudinal sectional view of the structure of a Ansaugrohrkörpers;

14 a cross-sectional view of the intake manifold of 15 along the line aa;

15 a longitudinal sectional view of a Ansaugrohrkörpers;

16 . 17 the construction of a fuel line or a coolant line;

18 an intake pipe body;

19 a view for explaining the structure of an exhaust gas recirculation line;

20 a view for explaining the structure of another embodiment of the exhaust gas recirculation line;

21 . 22 alternative arrangements for mounting a control unit in the air intake system according to the invention; and

23 - 25 an arrangement of the electrical power supply in the air intake system according to the invention.

The internal combustion engine air intake system according to the present invention includes an air intake section 7 . 8th , a collector's section 9 and a suction pipe section 10 , which are arranged side by side and by partitions 11 are separated from each other.

In 1 is an air intake system 100 for explaining the present invention, which is installed in a V-type engine, the two cylinder banks 1 . 2 are oriented at a certain angle to each other. This V-type engine generally has 6, 8 or 12 cylinders, and the present invention can be applied to any of these cases. In the V-engine is between the left cylinder bank 1 and the right cylinder bank 2 a space is provided in which the air intake system (or a part thereof) is housed. Therefore, the air intake system must have compact dimensions.

1 is a cross-sectional view of the engine in which the two benches 1 and 2 are shown. 2 is a partial longitudinal sectional view of the air intake system of 1 , How best 1 As can be seen, the air intake system includes three main sections or chambers which are juxtaposed and separated by a common wall. These three main sections include an air intake section 7 . 8th , a collector's section 9 and a suction pipe section 10 , The air that has entered an air filter (not shown) travels through a suction line 4 to an airflow sensor 5 (about the hot-wire type, the blade type or the pressure detection type) and then by a throttle valve 6 with which the amount of the intake air supplied to the engine is controlled. The throttle 6 can be driven either mechanically or electrically by means of a motor.

The air flowing through the throttle 6 has moved, flows into a connecting portion 7 that a transition from the generally circular cross-section of the throttle flap portion 6 to a passage section 8th (which generally has a rectangular cross-section) creates, and in a collector section 9 and then into the intake pipe section 10 in which it is split on the intake pipes of the individual cylinders of the engine. A collector's body 108 contains the air inlet section 7 and the collector section 9 while a Ansaugrohrkörper 110 the intake pipe section 10 contains.

Thereafter, the air flows through intake ducts 3 into the combustion chambers 12 of the motor.

In the structure described above, the passage portion 8th , the collector section 9 and the intake pipe section 10 juxtaposed, separated by common partitions and connected together directly or through the partitions to give a compact intake system. The order of these three components is not fixed. As will be described later, may be on the partition wall 11 between the passage section 8th and the collector section 9 an electronic control unit for controlling the engine are mounted, the Kühlwir be taken into account. This control unit is therefore cooled by the intake air.

In the intake channel 3 of each cylinder are both an injection valve 14 as well as an air passage 15 that causes a swirling of the air in the combustion chamber 12 causes, arranged. (This air passage is not necessary if no turbulence needs to be generated.) In the body of the intake pipe section 10 are flow divider valves 17 for controlling the flow of air into the intake pipe section 10 and in the air passage 15 provided for each cylinder for the generation of the swirling motion. The flow divider valve 17 is from a wave 18 supported and over one at one end of the wave 18 attached coupler 19 with a drive device 20 coupled. (In the present embodiment, as an example of the flow divider valve 17 a butterfly valve is shown, however, the same effect can be achieved when using a spool valve or other type of valve. Furthermore, the drive device 20 an electric motor on a diaphragm that utilizes a pressure difference.) As will be described in more detail below, controls in the header section 9 a control valve 21 an air column resonance point to improve engine intake capacity. (In the present embodiment, as an example, the control valve controlling the air column resonance point 21 a rotary flap shown, wherein an actuating element 16 the control valve 21 however, the same effect can be obtained by using a spool valve and the like.)

The collector body 108 and the intake pipe body 110 to which reference has been made above are by means of fasteners 24 fastened in the 3 and 4 are shown. A collector's body 108 who like in 3 is constructed has smooth surfaces and therefore has a low strength against an external force. On the other hand, has the collector body 108 the present invention, as in 4 is constructed, a three-dimensional construction, which is considerably stiffer.

Well, with respect to the 5 and 6 another feature of the present invention is explained. In the 7 and 8th An arrow indicates the flow direction of the air in the passage section 8th or in the collector section 9 at. In the passage section 8th or in the collector section 9 is like in connection with 4 explains a projection 25 present, which is a turbulence 26 the flow of air near the projection 25 can cause, as in 5 is shown. In 6 in which the prior invention is shown, the projection 25A only a slight change in shape, so that no turbulence arises. This prevents an increase in the intake air resistance in this area.

In the 7 and 8th the main resonance of the air column is shown in the air intake system according to the invention, wherein the air intake system shown by means of a partition wall 107 that is a control valve 29 for controlling the resonance point of the air column is divided into two sections corresponding to the two cylinder banks of the V-engine. As in 7 shown form with the control valve closed 21 the throttle 6 , the passage section 8th , the collector section 9 and the intake pipe section 10 a passage, which is why the intake pipe is very long in terms of charging and has a lowered resonant frequency and an increased resonance at low engine speed result. As in 8th shown extends with the control valve open 21 the intake system to the open portion of the control valve 21 , In this case, since the resonance section is short, resonant charging occurs at a high speed. The length of the resonant intake manifold may be as described above by actuating the control valve 21 be changed, whereby the charge in a larger engine speed range is possible. The arrangement of the control valve 21 as part of the partition 107 has proved to be suitable, because it is not necessary to provide a special intake pipe, so that it has become possible to make the air intake system compact.

Now, with respect to 9 a mechanism for generating turbulence in the combustion chamber 12 of the engine explained. The in the combustion chamber 12 sucked air moves through the flow divider valve 17 (see also 2 ), the intake pipe section 10 and the intake valves 27 then to the combustion chamber 12 sucked to who. At this time, the ratio of the through the intake pipe section 10 flowing air to the through the air passage 15 flowing air by opening and closing the flow divider valve 17 to be changed. When the flow divider valve 17 is closed, a large part of the intake air moves through the air passage 15 , By the intake air flow, which, as indicated in the drawing by an arrow, has a certain direction, is in the combustion chamber 12 a turbulence 28 generated. In such a system, that in the combustion chamber 12 using the deflected flow of the intake air in the intake pipe section 10 creates a swirling motion, a flow divider valve 17 used, which is partially cut off, as in 10 at 29 is shown. Further, in the air intake system with two air passages 15 in the intake passage section of the engine, the two intake valves 27 A similar effect can be obtained when the flow divider valve 17 so that it is the air passage 15 closes. In the V-engine is the Ansaugrohrabschnitt 10 in an area between the two cylinder banks, also here is the flow divider valve 17 , Furthermore, the plurality of flow dividing valves 17 as in 11 shown for all cylinders by the shaft 18 (please refer 2 ) supported. The use of two waves 18 is disadvantageous, however, because this would require additional space.

As also described above, the flow divider valve 17 partially cut off, as in 10 at 29 is shown. It should be noted, however, that in the case of the system with two air passages 15 in the intake passage section, the two intake valves 27 correspond, instead of the flow divider valve 17 a similar effect through the use of two Verwirbelungssteuerventile, one in each air passage 15 , can be achieved.

In the intake system in which the flow divider valves 17 for all cylinders by a single shaft 18 supported, it may happen that the flow divider valve 17 due to temperature changes does not work evenly, if the axial movement of the shaft 18 is limited because the intake manifold body 110 and the wave 18 , which are likely to have different thermal expansion coefficients, are formed in a one-piece construction, as in FIG 13 is shown. As in 12 is shown to eliminate this problem is the coupler 19 that the wave 18 with the drive device 20 connects, with a slot 19a provided in the one on the shaft 18 attached fixing pin 19B is fitted to an axial movement of the shaft 18 allow and only the rotational movement of the drive device 20 due to this axial movement of the shaft 18 a different axial thermal expansion or contraction of the Ansaugrohrkörpers 110 and the wave 18 , which is caused by temperature changes, can be compensated. The flow divider valve 17 can therefore always work evenly. It should be noted that the in 12 shown construction of the coupler 19 can also be realized by a construction in which in the shaft 18 a slot is provided and the fixing pin 19B at the coupler 19 is attached.

The 13 and 14 show further construction details of an embodiment of the air intake system according to the invention. 13 is a longitudinal sectional view in which the sucked air is symbolized by an arrow. 14 FIG. 12 is a cross-sectional view of the present embodiment taken along the line aa in FIG 13 , The passage section 8th and the collector section 9 are longitudinally by partitions 111 respectively. 112 divided ( 14 ) to the passage section 8th and the collector section 9 for each cylinder bank of the engine to allow resonant charging as described above. In the present embodiment, both the passage section body have 106 as well as the collector section body 108 an E-shaped cross section and are arranged one above the other. This type of construction provides additional strength with respect to external force because of the partitions 111 and 112 are ribbed and because the superposition increases the rigidity of the device. This structure is also advantageous in terms of manufacturing and cost, because the configuration is relatively simple. If no resonance charging occurs, the passage section body must 106 and the collector section body 108 have no E-shaped cross-section, but may be channel or box-shaped.

15 shows a further embodiment of the present invention, in which a collector section body 108 has three stages arranged one above the other. In this structure, the intake air flows from the throttle valve 6 to the intake pipe section 10 as indicated by the arrow in the drawing. For a given, fixed length of the intake pipe, the mounting space for the air intake system in the longitudinal direction of the engine can be reduced. In 15 For example, the air intake system has three superposed stages of the header section body, but the number is not limited to three steps.

16 shows a cross-sectional view of the injection valve portion 14 that is in the intake manifold body 110 is appropriate. The injection valve 14 receives the fuel passing through a in the intake manifold 110 arranged fuel line 30 is supplied. In the intake manifold body 110 is an intake air passage 31 provided, the fuel atomization at the time of fuel supply from the injector 14 improved to the engine. The air supply from the intake air passage 31 to the injection valve 14 gets through a small hole 31A accomplished.

The present embodiment, as described above, does not require separate supply lines as in conventional intake systems to supply both fuel and air to the injector 14 supply, so that both the mounting space and the cost can be reduced. The present embodiment is of course suitable even if the construction does not have an intake air passage 31 ie, when in the system fuel atomization is not improved by air.

17 is a cross-sectional view of the injector 14 similar to in 16 , The injection valve 14 is from the fuel line 30 in the on induction pipe 110 attached, fueled. In the vicinity of the fuel line 30 in the intake pipe body is a cooling fluid pipe 32 intended. The cooling fluid flowing through this cooling fluid line 32 flows, thus flows through the engine. The flow of cooling fluid through the cooling fluid line 32 cools the fuel line 30 so that it is possible to use the fuel line 30 to protect against the heat of the engine and thereby prevent a vapor barrier in the fuel system.

18 is a cross-sectional view of a modification of the structure of 2 , (Elements having the same function are denoted by the same reference numerals as in FIG 2 In this structure, the air coming from an air filter (not shown) flows through the passage 4 and past the intake air flow sensor and then through the throttle 6 that controls the intake air flow to the engine. The air, attached to the throttle 6 has passed, flows through the passage section 8th and the collector section 9 and then into the intake pipe section 10 which corresponds to the individual cylinders. Thereafter, the air flows through the intake ducts 3 of the engine in the combustion chamber 12 ( 1 ). In this embodiment, the suction pipe body is 110 made of metal, while the collector body 108 made of synthetic resin. The intake manifold made of metal 110 limits the vibration of the individual cylinder banks peculiar to a V engine, while the collector body formed of synthetic resin 108 , which can be poured into any shapes, can form a suction pipe with a nearly ideal configuration. Because beyond the wall thickness of the collector body 108 can be reduced, it is possible to reduce both the required mounting space and the weight. Further, a resin molding generally has a more uniform surface than a metal casting, so that the intake air pressure in the intake pipe 110 does not increase when the resin molding is used in the intake pipe, so that the Ansaugwirkungsgrad is improved. It should be noted that also in the present invention, a part or all of those components which in the in. In 2 shown embodiment can also be used here.

19 FIG. 12 is a side sectional view of a structure at the downstream side of the intake air flow path of the throttle valve. FIG 6 of the collector body 108 an exhaust gas recirculation exhaust passage 33 located in the air intake section 7 empties. The arrangement of the outlet channel 30 at the position shown in the drawings allows an effective mixture of the intake air and the gas supplied via the exhaust gas recirculation, whereby a good distribution of the gas supplied by the exhaust gas recirculation gas is ensured to the individual cylinders of the engine.

20 shows a cross section of the injection valve 14 in the 19 shown intake manifold body 110 , (Elements having the same function are denoted by the same reference numerals as in FIGS 16 and 17 in the intake manifold body 110 is an exhaust gas recirculation line 34 provided with a pipe 34A is connected, in turn to Ansaugrohrabschnitt 10 leads. When the above-described structure is used, no additional pipe needs to be provided because the exhaust gas recirculation line 34 in the intake manifold body 110 is formed in one piece and a good distribution of the air is ensured on the individual cylinders. Since also the outlet channel 33 downstream of the injector 14 is, it is unlikely that the injector 14 gets dirty.

21 Fig. 15 is a longitudinal sectional view of the present invention, illustrating a possible structure of an electronic control unit in the air passage. The air inlet section 7 and the passage section 8th have the same configuration as above with respect to 2 and other figures explained. The control unit 13 is in the passage section 8th provided so that the need for a special mounting space is eliminated. It gets through the throttle 6 sucked intake air cooled. Further, since the passage section 8th in which the control unit 13 on the partition 11 is attached to the intake pipe section 10 over the collector portion arranged downstream 9 there is no risk that the control unit 13 is polluted by in-blown soot particles from the engine.

22 shows a further embodiment of the present invention, in which the control unit 13 on the upper wall surface of the collector body 108 is appropriate. Also in this case, the same effect as in conjunction with 25 obtained, wherein no disadvantage arises if the wall surface is curved, as long as they the inner wall surface of the collector body 108 is.

Regarding 23 another feature of the air intake system according to the invention will be explained. 23 shows the section CC of 22 For the reason described above, the section CC is located at this position, but this arrangement is not limitative. The collector body 108 contains wires 35 by which the individual parts are supplied with electric current.

24 shows a modification of 23 in which the wires 36 have square cross section. Of course, the cross-sectional shape of the wires 36 not limited. As with the above As mentioned above, additional space for the wires can be saved and, moreover, since the wire itself does not require an insulating sheath, the air intake system has the advantage of reducing both space requirements and costs.

25 is a cross section of the end of the wires 35 or 36 in the collector's body 108 are arranged. At the end of the wires 35 or 36 is a connection terminal 37 provided, furthermore, with the collector body 108 in one piece a connector 108A poured, so that the wires can be connected in such a way that each part can be supplied with electrical power. This structure eliminates the need for a separate arrangement of the above-mentioned connector, so that space is saved.

According to the present Invention can with the compact air intake system the suction performance can be improved. Therefore, the engine can be compact Dimensions obtained so that the shape of the motor vehicle can be made arbitrary and consequently an energy saving and a cost reduction are possible what kind of a motor vehicle a big one Advantage represents.

Even though the present invention is described and shown in detail above has been described, the above description is merely illustrative and is in no way limiting. The spirit and scope of the present invention are only apparent through the attached claims Are defined.

Claims (5)

Air intake system for a multi-cylinder internal combustion engine with - a throttle valve ( 6 ) for controlling the amount of air supplied to the engine, - an inlet body ( 110 ) with inlet section ( 10 ) for dividing the intake air to each cylinder of the engine and - an air guide section ( 8th ) for directing the air from the throttle valve ( 6 ) to the inlet section ( 10 ), characterized in that - the air guide section ( 8th ) in a passage section body ( 106 ) arranged on the inlet body via fastening means ( 24 ), and - within the passage section body ( 106 ) is arranged a collector body, which by fastening the Durchlaßabschnittskörpers ( 106 ) on the inlet body ( 110 ) by means of the fastening means ( 24 ) between the passage section body (FIG. 106 ) and the inlet body ( 110 ) is trapped. Air intake system according to claim 1, characterized by an injection valve ( 14 ) located on the inlet body ( 110 ) is mounted so that it can introduce fuel into an intake passage of each cylinder of the engine. Air intake system according to at least one of claims 1 or 2, characterized by an air passage ( 15 ) located in the inlet body ( 110 ) is provided such that an air turbulence ( 28 ) is generated within the cylinder of the engine. Air intake system according to at least one of claims 1 to 3, characterized by a in the inlet section ( 10 ) provided flow divider valve ( 17 ) for controlling the flow of air into the inlet section (Fig. 10 ) and at least one air passage ( 15 ) for generating a turbulence ( 28 ) in the cylinder of the engine. Air intake system according to at least one of claims 1 to 4, characterized in that the throttle valve ( 6 ) is electrically driven by a motor.