EP0881378A2 - Abgasrückführungssystem für Brennkraftmaschine - Google Patents

Abgasrückführungssystem für Brennkraftmaschine Download PDF

Info

Publication number
EP0881378A2
EP0881378A2 EP98109895A EP98109895A EP0881378A2 EP 0881378 A2 EP0881378 A2 EP 0881378A2 EP 98109895 A EP98109895 A EP 98109895A EP 98109895 A EP98109895 A EP 98109895A EP 0881378 A2 EP0881378 A2 EP 0881378A2
Authority
EP
European Patent Office
Prior art keywords
downstream
intake passage
throttle valve
introduction port
egr
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP98109895A
Other languages
English (en)
French (fr)
Other versions
EP0881378A3 (de
EP0881378B1 (de
Inventor
Kouji Mori
Kodai Yoshizawa
Satoshi Takeyama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Publication of EP0881378A2 publication Critical patent/EP0881378A2/de
Publication of EP0881378A3 publication Critical patent/EP0881378A3/de
Application granted granted Critical
Publication of EP0881378B1 publication Critical patent/EP0881378B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
    • F02M26/19—Means for improving the mixing of air and recirculated exhaust gases, e.g. venturis or multiple openings to the intake system
    • 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
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/50—Arrangements or methods for preventing or reducing deposits, corrosion or wear caused by impurities

Definitions

  • the present invention relates to an exhaust gas recirculation (EGR) system for returning part of exhaust gas of an engine to an intake system to improve the fuel efficiency and exhaust performance.
  • EGR exhaust gas recirculation
  • Japanese Utility Model Kokai Publication No. 3(1991)-114563 shows a first conventional EGR system having a horizontally confronting pair of openings for introducing EGR gas into an intake pipe.
  • Japanese Utility Model Kokai Publication No. 3(1991)-114564 shows a second conventional EGR system having an annular EGR gas passage around an intake pipe and a plurality of holes for introducing the EGR gas from the annular passage into the intake pipe. Both systems are aimed to reduce the cylinder to cylinder nonuniformity in the EGR rate.
  • Japanese Patent Kokai Publication No. 8(1996)-218949 discloses a third conventional EGR system having an EGR passage opening to a second surge tank provided downstream of a first surge tank in an intake passage. This system introduces the EGR gas at a remote position from a throttle valve, to prevent adhesion to the throttle valve, of harmful components (deposits) of the exhaust gas mixture.
  • the conventional EGR systems are not completely sufficient for mixing the EGR gas with the intake air and for uniformly distributing the EGR gas to the engine cylinders.
  • the second system conditions of fresh intake air streams through the throttle valve exert large influence on the mixing of the EGR gas and adhesion of deposits to the throttle valve.
  • Insufficient blend of the EGR gas with the intake air is causative of uneven distribution of the EGR rate among the cylinders, unstable engine performance, increase of emission and poor fuel economy.
  • Deposits on a throttle valve decrease the accuracy of intake air quantity control.
  • an exhaust gas recirculation system for an engine comprises an exhaust system, an intake system and an EGR system.
  • the intake system comprises a pipe arrangement or pipe system and a throttle valve.
  • the pipe arrangement is a single member or an assembly (such as an assembly of an intake manifold and a throttle body) for defining passages for distributing intake air to cylinders of the engine.
  • the pipe arrangement comprises a collector section, a plurality of branches leading from the collector section, respectively, to the cylinders of the engine, and an intake passage section for introducing the intake air into the collector section.
  • the throttle valve is disposed in the intake passage section at an intermediate position so that the intake passage section is divided into an upstream intake passage subsection on an upstream side of the throttle valve and a downstream intake passage subsection extending from the throttle valve to the collector section.
  • the EGR system is arranged to return part of the exhaust gas as EGR gas from the exhaust system into the downstream passage subsection of the intake system.
  • the EGR system comprises at least one EGR gas introduction port having an EGR gas introduction opening for directing an inflow EGR gas stream into the downstream passage subsection.
  • the EGR gas introduction opening is located downstream of a first free end of the throttle valve in a closed position.
  • the EGR gas introduction port extends along a tangential direction tangential to a curved inside wall surface of the downstream passage subsection.
  • An inflow direction of the EGR gas introduction port is inclined downstream so as to form a predetermined angle with respect to a direction of a fresh intake air stream in the downstream intake passage subsection.
  • the EGR port is thus directed to produce a screw-like spiral flow advancing downstream along the inside surface of the intake passage subsection.
  • An intake air stream is induced into the spiral flow and well mixed with the EGR gas.
  • the spiral flow promotes mixing of the EGR gas with the intake air, and prevents deposits by keeping the EGR gas outside a back flow region behind the throttle valve.
  • Fig. 1 is a schematic view showing an engine system having EGR introduction ports according to a first embodiment of the present invention.
  • Fig. 2 is a view showing an arrangement of the EGR ports according to the first embodiment.
  • Fig. 3 is a view showing the arrangement of the EGR ports according to the first embodiment.
  • Fig. 4 is a graph showing an EGR region.
  • Figs. 5 and 6 are views for illustrating streams on the downstream side of a throttle valve.
  • Fig. 7 is a graph showing a relation between a throttle opening and a back flow region.
  • Figs. 8 and 9 are views for illustrating extents of a back flow region under low load condition and high load condition.
  • Figs. 10 ⁇ 14 are views for illustrating EGR gas diffusion from various introduction positions.
  • Figs. 15, 16 and 17 are views for illustrating a spiral flow produced by the EGR introduction ports according to the first embodiment of the invention.
  • Fig. 18 is a view showing a travel distance of the EGR gas along a spiral path according to the first embodiment of the invention.
  • Fig. 19 is a graph for illustrating improvement in cylinder to cylinder EGR distribution by the spiral EGR path shown in Fig. 18.
  • Figs. 20A and 20B are schematic views for illustrating the EGR introductions positions according to the first embodiment.
  • Fig. 21 is a graph for illustrating improvement in deposit prevention by the EGR introduction positions according to the first embodiment.
  • Fig. 22 is a schematic view showing gas introduction ports of an EGR system according to a second embodiment of the present invention.
  • Fig. 23 is a schematic view showing the arrangement of the introduction ports according to the second embodiment.
  • Fig. 24 is a schematic view showing the arrangement of the introduction ports according to the second embodiment.
  • Fig. 25 is a schematic view showing gas introduction ports of an EGR system according to a third embodiment of the present invention.
  • Fig. 26 is a schematic view showing the arrangement of the introduction ports according to the third embodiment.
  • Fig. 27 is a schematic view showing gas introduction ports of an EGR system according to a fourth embodiment of the present invention.
  • Fig. 28 is a schematic view showing an EGR introduction point according to a fifth embodiment of the present invention.
  • Fig. 29 is a graph showing factors to determine gas introduction ports of an EGR system according to a sixth embodiment of the present invention.
  • Figs. 30 and 31 are views for illustrating effect of the gas introduction ports according to the sixth embodiment.
  • Fig. 32 is a schematic view showing introduction ports of an EGR system according to a seventh embodiment of the present invention.
  • Fig. 33 is a graph for illustrating EGR introduction points according to the seventh embodiment.
  • Figs. 1 ⁇ 3 show an engine system according to a first embodiment of the present invention.
  • the engine system shown in Fig. 1 comprises an engine 20, an intake system, an exhaust system, and an EGR system for returning part of the exhaust gas as EGR gas from the exhaust system to the intake system.
  • the intake system comprises a piping (or pipe arrangement or pipe system) for distributing intake air to cylinders of the engine 20.
  • the intake piping of this example includes an intake manifold 21 and a throttle body 26 for defining an intake passage system for distributing the intake air to the engine cylinders.
  • the exhaust system comprises an exhaust manifold 22 for carrying exhaust gas away from the cylinders of the engine 20.
  • the intake manifold 21 of this example includes an inlet pipe section 23, a collector section 24 of a predetermined volume extending from the inlet pipe section 23, and a set of branches 25 extending from the collector section 24 to the cylinders of the engine 20, respectively.
  • the throttle body 26 is connected with the intake manifold 21 on the upstream side of the inlet pipe section 23.
  • the throttle body 26 and the inlet section 23 define an intake air passage for introducing the intake air to the collector section 24 of the intake manifold 21.
  • the throttle body 26 has a throttle valve 27 therein.
  • the throttle valve 27 is disposed in the intake air passage.
  • a downstream passage section of the intake passage extends to the collector section 24.
  • the exhaust manifold 22 comprises a set of branches 28 extending respectively from the engine cylinders, and an exhaust pipe section 30 to which the branches 28 converge.
  • the EGR system comprises an EGR passage 31 for exhaust gas recirculation.
  • the EGR passage 31 branches off from the exhaust pipe section 30.
  • the EGR passage 31 of this example bifurcates into first and second branch passages 32 and 33 leading to the inlet pipe section 23 of the intake manifold 21 between the throttle valve 27 and the collector section 24.
  • the EGR gas from the exhaust system flows into the intake flow in the intake air passage at a confluence point located in the downstream passage section downstream of the throttle valve 27 and upstream of the collector section 24.
  • the first branch passage 32 has a first introduction port 34 having a first EGR gas introduction opening which opens into the inlet pipe section 23 at a first EGR introduction position located in the rear of a downstream side free end 27a of the throttle valve 27 in a closed position.
  • the second branch passage 33 has a second introduction port 35 having a second EGR gas introduction opening which opens in the intake pipe section 23 at a second EGR introduction position located in the rear of the position of an upstream side free end 27b of the throttle valve 27 in the closed position.
  • the inlet pipe section 23 of this example has a circular cross section as shown in Fig. 3.
  • each of the first and second introduction ports 34 and 35 extends along a line tangent to the circle of the cross section of the inlet pipe section 23.
  • the first and second introduction ports 34 and 35 are so arranged that the two inflow directions of the first and second introduction ports 34 and 35 are opposite to each other as shown in Fig. 3.
  • the first and second introduction ports 34 and 35 are opened in a cross-flow manner (or counter flow manner) in the opposite directions.
  • each of the introduction ports 34 and 35 is inclined downstream so as to form a predetermined angle ⁇ (lead angle) with respect to a fresh intake air flow direction in the inlet pipe section 23.
  • introduction ports 34 and 35 it is optional to arrange the introduction ports 34 and 35 so that the ports 34 and 35 extend from the opposite directions, respectively.
  • the introduction port 34 extends from the left side of Fig. 3, and the introduction port 35 extends from the right.
  • Fig. 4 shows a normal engine operating region and an EGR region in terms of the engine speed and the throttle opening degree.
  • the region in which EGR is utilized is a region formed by excluding a high load region near full throttle and a low load region near idle condition.
  • Figs. 5 and 6 schematically show streams in the inlet pipe section 23 on the downstream side of the throttle valve 27, as viewed from a direction perpendicular to the axis of the throttle valve 27 and a direction parallel to the axis of the throttle valve 27.
  • Figs. 5 and 6 schematically show streams in the inlet pipe section 23 on the downstream side of the throttle valve 27, as viewed from a direction perpendicular to the axis of the throttle valve 27 and a direction parallel to the axis of the throttle valve 27.
  • the size of the back flow region varies in dependence on the opening degree of the throttle valve 27, as shown in Fig. 7.
  • Figs. 8 and 9 show forms of back flow streams in the high load operating region and the low load region. The back flow region grows larger when the opening degree of the throttle valve 27 is small.
  • the EGR gas is introduced horizontally at a position downstream of the back flow region behind the throttle valve 27.
  • the EGR gas is caught between upper main stream and lower main stream, respectively, from the free ends 27a and 27b of the throttle valve 27. Therefore, the EGR gas is carried away toward the collector section 24 quickly before diffusing enough.
  • the EGR confluence position of Fig. 10 is advantageous to prevention of deposit but disadvantageous to mixing with fresh intake air.
  • the EGR gas is introduced horizontally into the back flow region near the throttle valve 27.
  • the EGR gas is pushed backward by back flow streams and strikes directly against the throttle valve 27, causing undesired deposition.
  • the EGR gas is introduced horizontally at a position near the downstream end of the back flow region.
  • Variation in the engine load condition caused by variation in the throttle opening exerts strong influence, and the mixing of the EGR gas with the fresh intake air and prevention of deposit are both unstable.
  • the instability is increased especially when the amount of EGR is increased.
  • the EGR gas is introduced vertically.
  • the back flow region influences the performance in mixing of the EGR gas with the fresh intake air and the prevention of deposit in the same manner as in the examples of Figs. 10 and 11.
  • the EGR gas forms a drift stream segregated from fresh intake air streams coming from the free ends of the throttle valve 27, without mingling with the fresh air streams.
  • the performance is affected by the flow speed of the EGR gas.
  • the EGR gas streams are fast and strong, the EGR streams vertically traverse the main streams, and increase undesired deposition.
  • the EGR gas streams are weak, the EGR gas forms segregated streams detrimental to the gas mixing.
  • Fig. 7 shows how the back flow region affects the mixing of the EGR gas with the fresh intake air and the formation of deposit.
  • the requirements for promoting the mixing of the EGR gas with the fresh intake air and preventing deposit are: i) to avoid the back flow region, ii) to increase a stay time of the EGR gas, iii) to mix the EGR gas into main streams of the fresh intake air from both free ends of the throttle valve 27.
  • the EGR system employs at least one EGR gas introduction port directed to produce a spiral flow mixing with fresh main streams (upper main stream and lower main stream) from the free ends 27a and 27b of the throttle valve 27.
  • the first EGR gas confluence of the first introduction port 34 is located just in the rear of the downstream side free end 27a of the throttle valve 27 in the closed valve position
  • the second EGR gas confluence of the second introduction port 35 is located just in the rear of the upstream side free end 27b of the throttle valve 27 in the closed valve position.
  • Each introduction port 34 or 35 extends along a line tangent to the circular cross section of the inlet pipe section 23, and each introduction port 34 or 35 is inclined downstream so as to form a predetermined angle ⁇ (lead angle) with respect to a fresh intake air flow direction in the inlet pipe section 23.
  • the first and second introduction ports 34 and 35 are opened in a cross-flow manner (or counter flow manner) in the opposite directions.
  • the EGR gas is mixed with the fresh intake air outside the back flow region at a mixing position where the velocity of the fresh main stream is highest, and the EGR gas and the intake air form a spiral flow flowing helically on and near the cylindrical inside wall surface of the inlet pipe section 23 toward the collector section 24.
  • the EGR gas stays very long as compared with the conventional design.
  • the main fresh intake air streams are involved into the spiral flow of the EGR gas, and the EGR gas diffuses from the outside toward the center of the inlet pipe section 23 in the process of the spiral flow.
  • the EGR gas stays outside the back flow region, without causing deposit.
  • the EGR system of this embodiment can mix the EGR gas with the intake air sufficiently, distribute the EGR gas uniformly among the cylinders, and prevent deposits efficiently.
  • the distance L2 traveled by the EGR gas along the spiral flow path (corresponding to the stay time) to the inlet of the most upstream branch 25 is much longer than the distance L1 of the conventional straight path.
  • the degree of nonuniformity or irregularity in the EGR gas distribution among the cylinders is decreased by the increase in the EGR gas travel distance.
  • the upper and lower EGR introduction positions according to this embodiment can prevent the formation of deposits sufficiently as compared with the center EGR introduction position.
  • the engine system according to the first embodiment of the present invention can make the EGR rates of the cylinders uniform even when the amount of EGR is great, and thereby improve the fuel consumption and exhaust performance. Furthermore, the engine system according to this embodiment can ensure the accurate control of the intake air quantity by preventing deposits.
  • Figs. 22 ⁇ 24 show an EGR system according to a second embodiment of the present invention.
  • Each of the EGR introduction ports 34 and 35 comprises a guide case 40 defining the EGR introduction opening.
  • the guide case 40 of each introduction port is cylindrical, and projects into the inlet pipe section 23.
  • each introduction port has the EGR introduction opening in an imaginary plane containing the axis of the inlet pipe section 23. The axis of the throttle valve 27 is perpendicular to this plane.
  • the guide case 40 of each introduction port 34 or 35 is oriented to produce a spiral flow advancing downstream as in the first embodiment, and opened at the position to drag the upper or lower main intake stream into the spiral flow.
  • the outside cylindrical surface of each guide case 40 exposed in the inside of the inlet pipe section 23 serves as a deflector for inducing and guiding the fresh intake air stream (upper main stream or lower main stream) to the direction of the spiral flow.
  • the EGR system of the second embodiment can mix the EGR gas with the intake air sufficiently, distribute the EGR gas uniformly among the cylinders, and prevent deposits by causing the EGR gas to stay away from the back flow region.
  • Figs. 25 and 26 show an EGR system according to a third embodiment of the present invention.
  • the gas introduction opening of each of introduction ports 45 and 46 is in the form of an elongated circle.
  • the cross sectional shape of each of the introduction ports 45 and 46 is elongated along the longitudinal direction of the inlet pipe section 23, as shown in Fig. 25.
  • the cross sectional size of the opening of the second introduction port 46 in the rear of the upstream side end 27b of the throttle valve 27 is greater than the cross sectional opening size of the first introduction port 45 in the rear of the downstream side valve end 27a.
  • the elongated openings of the first and second introduction ports 45 and 46 make it possible to decrease the distance between the throttle valve 27 and the EGR gas introduction position, and to increase the distance to the collector section 24 to the advantage of mixing of the EGR gas with the fresh intake air.
  • the first EGR gas introduction port 45 is located on the side on which the region of the main fresh intake air stream is relatively narrow, and the second EGR gas introduction port 46 is located on the side on which the region of the main fresh intake air stream is relatively large. Therefore, the smaller introduction port 45 and the larger introduction port 46 can introduce the EGR gas efficiently, and keep the EGR gas outside of the back flow region.
  • Fig. 27 shows an EGR system according to a fourth embodiment of the present invention.
  • the EGR gas is introduced from an introduction port 51 located downstream of the upstream end 27b of the throttle valve 27 whereas an auxiliary air is introduced from an introduction port 50 downstream of the downstream end 27a of the throttle valve 27.
  • the introduction ports 50 and 51 are directed and opened as in the preceding embodiments. In this embodiment, therefore, the introduction port 51 is connected with the exhaust system, and the introduction port 50 is connected with the intake system at a position upstream of the throttle valve 27. In this example, the introduction port 50 is connected with an air cleaner on the upstream side of the throttle valve 27.
  • the EGR system of this example can increase the strength of the spiral flow and mix the EGR gas uniformly.
  • the introduction port 50 for the auxiliary air is located on the side on which the region of the main intake air stream is narrow. Therefore, this EGR system can prevent the EGR gas from entering the back flow region more efficiently, and prevent deposits from being produced.
  • Fig. 28 shows an EGR system according to a fifth embodiment.
  • the downstream inclination angle ⁇ (lead angle) (as shown in Fig. 2) of each EGR gas introduction port is so determined that the distance from the EGR gas introduction position to the inlet of the most upstream branch 25 of the intake manifold 21 along the longitudinal center line of the inlet pipe section 23 is longer than one pitch (lead) of a helix defined by the angle ⁇ , on the inside cylindrical surface of the inlet pipe section 23.
  • this design makes sufficiently long the travel distance of the EGR gas along the spiral path from the EGR gas confluence to the inlet of the most upstream branch 25, and ensures the proper mixing of the EGR gas with the intake air.
  • Fig. 29 is a graph for illustrating a sixth embodiment of the present invention.
  • the opening size (or opening area) of each of first and second EGR introduction ports 55 and 56 is determined in accordance with the maximum speed of the fresh intake air passing through the throttle valve 27, the distance between the axis of the throttle valve 27 and the openings of the gas introduction ports 55 and 56, and the EGR gas discharge speed (the speed of the EGR gas flowing into the inlet pipe section 23) modified by the shapes of the openings of the introduction ports 55 and 56.
  • the speed of a fresh main stream decreases as the distance from the throttle valve 27 in the downstream direction increases.
  • the opening sizes and shapes of the introduction ports 55 and 56 are so determined as to hold the discharge speed of the EGR gas from each introduction port 55 or 56 always high as compared with the speed of the main stream near the opening of the introduction port.
  • the setting of the EGR inflow speed is higher than the fresh main stream speed, as shown in Fig. 29.
  • each of the introduction ports 55 and 56 flows the EGR gas into the inlet pipe section 23 at such a sufficient velocity to produce a strong spiral flow as shown in Fig. 30, instead of losing its speed by collision with the main stream as shown in Fig. 31.
  • the EGR gas flows along the spiral path without turning inside toward the center of the inlet pipe section 23, and stays away from the back flow region without causing deposits.
  • the higher speed EGR flow of Fig. 30 can prevent deposits and mix the EGR gas efficiently.
  • Fig. 32 shows a part of an engine system according to a seventh embodiment of the present invention.
  • the intake passage defined by the inlet pipe section 23 and the throttle body 26 is inclined with respect to the longitudinal direction of the collector section 24 to form a bend 62 of an angle ⁇ in an imaginary plane to which the axis of the throttle valve 27 is perpendicular.
  • the positions of the openings of first and second introduction ports 60 and 61 are adjusted in accordance with the bend angle ⁇ .
  • the longitudinal center line of the intake air passage is bend downward with respect to the longitudinal direction of the collector section 24, so that the upstream side end 27b of the throttle valve 27 is located on the inner side of the bend 62.
  • the gas introduction position of the introduction port 61 located downstream of the upstream free end 27b of the throttle valve on the inner side of the bend 62 is shifted downstream slightly, and the gas introduction position of the introduction port 60 located downstream of the downstream free end 27a of the throttle valve on the outer side of the bend 62 is shifted downstream to a greater extent in accordance with the downward bend angle.
  • the longitudinal distance along the longitudinal direction of the inlet pipe section 23 from the axis of the throttle valve 27 to the confluence point of the port 60 on the outer side of the bend 62 is greater than the longitudinal distance from the axis of the throttle valve 27 to the confluence point of the port 61 on the inner side of the bend 62.
  • the inlet pipe section 32 has a downward bend as shown in Fig. 32, the back flow region tends to shift toward the outer side of the bend. Therefore, the EGR introduction confluence positions of the ports 60 and 61 are shifted downstream so that the confluence point of the port 60 is shifted away from the back flow region.
  • the inlet pipe section has an upward bend, the back flow region shifts toward the center of the inlet pipe section 23. In this case, the confluence positions of the ports 60 and 61 are shifted upstream to increase the travel distance of the EGR gas.
  • the introduction ports 60 and 61 are thus opened at optimum positions in conformity with the form of the back flow region. Therefore, the design of this embodiment can mix the EGR gas efficiently, and prevent deposits.
  • the swing axis of the throttle valve 27 extends in an imaginary first center plane C1.
  • An imaginary second center plane C2 intersects the first center plane C1 at right angles along the center line of the cylindrical inlet pipe section 23.
  • the inlet pipe section 23 in the illustrated examples is straight, and in the form of a hollow right circular cylinder.
  • First and second imaginary tangent planes T1 and T2 are parallel to the first center plane C1, and tangent to the cylindrical inside wall surface of the inlet pipe section 23 on opposite sides of the first center plane C1.
  • Third and fourth imaginary tangent planes T3 and T4 are parallel to the second center plane C2, and tangent to the cylindrical inside wall surface of the inlet pipe section 23 on opposite sides of the second center plane C2.
  • an imaginary cross sectional plane S is a plane to which the center line of the inlet pipe section 23 is perpendicular, and the axis of the throttle valve 27 is parallel.
  • the first introduction port 34 extends alongside the first tangent plane T1 from a first side (right side) of the second center plane C2, and opens toward the fourth tangent plane T4.
  • the second introduction port 33 extends alongside the second tangent plane T2 from a second side (left side) of the second center plane C2, and opens toward the third tangent plane T3.
  • Each of the first and second introduction ports 34 and 35 of this example is circular in cross section.
  • the cylindrical inside wall surface of the first introduction port 34 contains one straight line which lies on the first tangent plane T1 and which is tangent to the cylindrical inside wall surface of the inlet pipe section 23 at a point shown at M1 in Fig. 3.
  • the cylindrical inside wall surface of the second introduction port 35 contains one straight line which lies on the second tangent plane T2 and which is tangent to the cylindrical inside wall surface of the inlet pipe section 23 at a point shown at M2 in Fig. 3.
  • the longitudinal direction of each introduction port 34 and 35 forms the angle ⁇ with the cross sectional plane S as shown in Fig. 2.
  • the first and second introduction ports 34 and 35 are inclined from the cross sectional plane S in a such a direction as to produce a spiral flow advancing downstream toward the collector section 24.
  • the spiral flow direction produced by the, first introduction port 34 is the same as that of the second introduction port 35. In the example of Fig. 3, the spiral flow is in the counterclockwise direction.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
EP98109895A 1997-05-30 1998-05-29 Abgasrückführungssystem für Brennkraftmaschine Expired - Lifetime EP0881378B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP142381/97 1997-05-30
JP14238197 1997-05-30
JP14238197A JP3528517B2 (ja) 1997-05-30 1997-05-30 エンジンの排気ガス還流装置

Publications (3)

Publication Number Publication Date
EP0881378A2 true EP0881378A2 (de) 1998-12-02
EP0881378A3 EP0881378A3 (de) 1999-07-07
EP0881378B1 EP0881378B1 (de) 2003-04-16

Family

ID=15314051

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98109895A Expired - Lifetime EP0881378B1 (de) 1997-05-30 1998-05-29 Abgasrückführungssystem für Brennkraftmaschine

Country Status (4)

Country Link
EP (1) EP0881378B1 (de)
JP (1) JP3528517B2 (de)
KR (1) KR100306187B1 (de)
DE (1) DE69813376T2 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1152141A1 (de) 2000-05-05 2001-11-07 Siemens Aktiengesellschaft Verfahren und Vorrichtung zur Rückführung von Abgas in den Ansaugluftstrom
EP1264981A1 (de) * 2001-06-05 2002-12-11 Holset Engineering Company Limited Mischung mehrerer Fluidströme
EP1270918A1 (de) * 2001-06-27 2003-01-02 Siemens Aktiengesellschaft Apparat für Abgasrückführung in einer Ansaugluftströmung
EP2218897A1 (de) * 2009-02-12 2010-08-18 Behr GmbH & Co. KG Vorrichtung zur Abgasrückführung für einen Verbrennungsmotor
EP2826984A1 (de) * 2013-07-18 2015-01-21 Aisin Seiki Kabushiki Kaisha Ansaugsystem für Verbrennungsmotoren

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004021212A1 (de) * 2004-04-29 2005-11-24 Volkswagen Ag Vorrichtung zur Abgasrückführung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4453502A (en) * 1980-06-27 1984-06-12 Cornell Research Foundation, Inc. Combustion control by prestratification
US4461150A (en) * 1981-02-21 1984-07-24 Daimler-Benz Aktiengesellschaft Exhaust gas return pipe connection for an internal combustion engine
DE3511094A1 (de) * 1985-03-27 1986-10-09 Doduco KG Dr. Eugen Dürrwächter, 7530 Pforzheim Vorrichtung zum zufuehren eines zusatzgasstroms in den ansaugkanal eines ottomotors
US4867109A (en) * 1976-11-26 1989-09-19 Etsuhiro Tezuka Intake passage arrangement for internal combustion engines

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4867109A (en) * 1976-11-26 1989-09-19 Etsuhiro Tezuka Intake passage arrangement for internal combustion engines
US4453502A (en) * 1980-06-27 1984-06-12 Cornell Research Foundation, Inc. Combustion control by prestratification
US4461150A (en) * 1981-02-21 1984-07-24 Daimler-Benz Aktiengesellschaft Exhaust gas return pipe connection for an internal combustion engine
DE3511094A1 (de) * 1985-03-27 1986-10-09 Doduco KG Dr. Eugen Dürrwächter, 7530 Pforzheim Vorrichtung zum zufuehren eines zusatzgasstroms in den ansaugkanal eines ottomotors

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1152141A1 (de) 2000-05-05 2001-11-07 Siemens Aktiengesellschaft Verfahren und Vorrichtung zur Rückführung von Abgas in den Ansaugluftstrom
EP1264981A1 (de) * 2001-06-05 2002-12-11 Holset Engineering Company Limited Mischung mehrerer Fluidströme
EP1270918A1 (de) * 2001-06-27 2003-01-02 Siemens Aktiengesellschaft Apparat für Abgasrückführung in einer Ansaugluftströmung
EP2218897A1 (de) * 2009-02-12 2010-08-18 Behr GmbH & Co. KG Vorrichtung zur Abgasrückführung für einen Verbrennungsmotor
EP2402585A1 (de) * 2009-02-12 2012-01-04 Behr GmbH & Co. KG Vorrichtung zur Abgasrückführung für einen Verbrennungsmotor
US8534267B2 (en) 2009-02-12 2013-09-17 Behr Gmbh & Co. Kg Device for exhaust gas recirculation for a combustion engine
EP2826984A1 (de) * 2013-07-18 2015-01-21 Aisin Seiki Kabushiki Kaisha Ansaugsystem für Verbrennungsmotoren

Also Published As

Publication number Publication date
KR100306187B1 (ko) 2001-11-17
JP3528517B2 (ja) 2004-05-17
EP0881378A3 (de) 1999-07-07
EP0881378B1 (de) 2003-04-16
JPH10331722A (ja) 1998-12-15
DE69813376T2 (de) 2003-10-30
KR19980087498A (ko) 1998-12-05
DE69813376D1 (de) 2003-05-22

Similar Documents

Publication Publication Date Title
US6138651A (en) Exhaust gas recirculation system for engine
US6918372B2 (en) Intake system of internal combustion engine
US10550804B2 (en) Air intake apparatus of multi-cylinder engine having secondary gas inlet passage connected to intake air inlet passage
US6868823B2 (en) Intake apparatus for internal combustion engine
EP0881378B1 (de) Abgasrückführungssystem für Brennkraftmaschine
JPS589248B2 (ja) 多気筒内燃機関の吸気装置
JP3675150B2 (ja) エンジンの排気ガス還流装置
JP2000073877A (ja) エンジンの排気ガス還流装置
JP3528565B2 (ja) エンジンの排気ガス還流装置
JP2000008970A (ja) 内燃機関の排気ガス還流装置
JP3539247B2 (ja) エンジンの排気ガス還流装置
KR100412018B1 (ko) 이지알장치부착 내연기관의 흡기계구조
JP3992813B2 (ja) エンジンのｅｇｒ装置
JP3959820B2 (ja) エンジンの排気ガス還流装置
JP3873442B2 (ja) エンジンの排気ガス還流装置
JP3536689B2 (ja) エンジンの排気ガス還流装置
JPH10325367A (ja) エンジンの排気ガス還流装置
JPS627923A (ja) エンジンの吸気装置
JP2019085919A (ja) エンジンの吸気装置
JP3444175B2 (ja) エンジンの排気ガス還流装置
JP3523498B2 (ja) エンジンのスワール形吸気ポート
JP3383337B2 (ja) 吸気コレクタ
JPH0415939Y2 (de)
CN117145622A (zh) 集成式排气歧管和发动机
JP2004308471A (ja) 内燃機関の吸気装置

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19980529

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE FR GB

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

AKX Designation fees paid

Free format text: DE FR GB

17Q First examination report despatched

Effective date: 20020219

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): DE FR GB

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REF Corresponds to:

Ref document number: 69813376

Country of ref document: DE

Date of ref document: 20030522

Kind code of ref document: P

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20040119

REG Reference to a national code

Ref country code: GB

Ref legal event code: 746

Effective date: 20080318

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 18

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20150527

Year of fee payment: 18

Ref country code: GB

Payment date: 20150527

Year of fee payment: 18

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20150508

Year of fee payment: 18

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 69813376

Country of ref document: DE

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20160529

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20170131

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20160531

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20161201

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20160529