GB2541167A - A long route EGR valve for a turbocharged automotive system - Google Patents

A long route EGR valve for a turbocharged automotive system Download PDF

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Publication number
GB2541167A
GB2541167A GB1513163.4A GB201513163A GB2541167A GB 2541167 A GB2541167 A GB 2541167A GB 201513163 A GB201513163 A GB 201513163A GB 2541167 A GB2541167 A GB 2541167A
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GB
United Kingdom
Prior art keywords
duct
long route
egr
passage
diameter
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.)
Withdrawn
Application number
GB1513163.4A
Other versions
GB201513163D0 (en
Inventor
De La Morena Joaquin
Racca Alberto
Maria Meano Cesare
Vicente Benajes Calvo Jesús
Maria Desantes Fernández José
Galindo Lucas Jose
Navarro Garcia Roberto
Piqueras Cabrera Pedro
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.)
GM Global Technology Operations LLC
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GM Global Technology Operations LLC
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 GM Global Technology Operations LLC filed Critical GM Global Technology Operations LLC
Priority to GB1513163.4A priority Critical patent/GB2541167A/en
Publication of GB201513163D0 publication Critical patent/GB201513163D0/en
Publication of GB2541167A publication Critical patent/GB2541167A/en
Withdrawn legal-status Critical Current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
    • 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
    • F02M26/65—Constructional details of EGR valves
    • F02M26/70—Flap valves; Rotary valves; Sliding valves; Resilient valves
    • 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
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/06—Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor
    • 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
    • F02M26/51—EGR valves combined with other devices, e.g. with intake valves or compressors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
    • F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
    • F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
    • F16K11/10—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit
    • F16K11/20—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit operated by separate actuating members
    • F16K11/22—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit operated by separate actuating members with an actuating member for each valve, e.g. interconnected to form multiple-way valves
    • 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
    • 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
    • F02M26/52—Systems for actuating EGR valves
    • F02M26/64—Systems for actuating EGR valves the EGR valve being operated together with an intake air throttle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
    • F16K11/10—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Supercharger (AREA)

Abstract

A long route, low pressure Exhaust Gas Recirculation (EGR) valve 500 comprising a three-port valve having a duct 510 with inlet 520 and outlet 530, the outlet 530 being provided with a compressor wheel seat 570, the duct 510 connecting an air intake duct (205, Fig. 3) with a turbocharger compressor (240, Fig. 3) inlet and being intercepted by a first flap 550; a passage 540 connecting a long route EGR circuit outlet with the duct 510 and being intercepted by a second flap 560, wherein the passage 540 is inclined with respect to the duct 510 by an angle of inclination (a) comprised between 30° and 70°; a distance (b) from a downstream outlet 585 of the passage 540 into the duct 510 to the compressor wheel seat 570 is between 0 and 2.5 times the diameter of the compressor wheel, and a distance (c) from the second flap 560 to an upstream outlet 565 of the passage 540 into the duct 510 is between 1 and 3 times the diameter of the passage 540. The duct 510 may have a tapered portion 590.

Description

A LONG ROUTE EGR VALVE FOR A TURBOCHARGED AUTOMOTIVE SYSTEM TECHNICAL FIELD
The technical field relates to a long route Exhaust Gas Recirculation (EGR) valve for a turbocharged automotive system.
BACKGROUND
Internal combustion engines may be provided with a forced air system such as a turbocharger in order to increase an engine's efficiency and power by forcing extra air into the combustion chambers of the cylinders.
The turbocharger comprises a compressor rotationally coupled to a turbine.
In order to reduce NOx polluting emissions, most turbocharged automotive systems comprise an exhaust gas recirculation (EGR) system, which is provided for routing back and mixing an appropriate amount of exhaust gas with the fresh induction air drawn into the engine.
Advanced EGR systems comprise a first EGR conduit which connects the exhaust manifold with the intake manifold, and a second EGR conduit which connects the exhaust line downstream of the aftertreatment systems to the intake line upstream the intake manifold and is connected therein by the interposition of three-way valve or by other means. The first EGR conduit is also known as “short route EGR”. The second EGR conduit defines instead a “long route” which comprises also a relevant portion of the exhaust line and a relevant portion of the intake line. It has to be noted that the long route Exhaust Gas Recirculation (LR-EGR) is also known in the art as low pressure Exhaust Gas Recirculation (LP-EGR).
In this way, the long route EGR is effective for routing back to the intake manifold a portion of the exhaust gases while also increasing the enthalpy to the turbine.
On engines equipped with a long route EGR system, as mentioned above also known as low pressure EGR system, an EGR valve is placed close to the compressor inlet. This close position can alter the characteristics of the flow entering the compressor wheel, affecting its performance.
In particular, a common limitation in turbocharged engines is represented by the compressor surge phenomenon which is one of the main limiting factors for boost delivery and torque generation at low engine speeds.
An object of an embodiment disclosed is to improve the design of the long route EGR valve with a view on achieving significant improvements on the compressor surge margin.
This and other objects are achieved by the embodiments of the invention as defined in the independent claims. The dependent claims include preferred and/or advantageous aspects of said embodiments.
SUMMARY
An embodiment of the disclosure provides a long route (low pressure) Exhaust Gas Recirculation (EGR) valve for a turbocharged automotive system comprising a turbocharger compressor and a long route EGR circuit, the valve comprising: - a duct having an inlet and an outlet, the outlet being provided with a compressor wheel seat, the duct connecting an air intake duct with a turbocharger compressor inlet and being intercepted by a first flap; - a passage connecting a long route EGR circuit outlet with the duct and being intercepted by a second flap; wherein - the passage is inclined with respect to the duct by an angle of inclination comprised between 30° and 70°; - a distance from a downstream outlet of the passage into the duct to the compressor wheel seat is comprised between 0 and 2.5 times the diameter of the compressor wheel; and - a distance from the second flap to an upstream outlet of the passage into the duct is comprised between 1 and 3 times the diameter of the passage.
An advantage of this embodiment is that the predisposition of such a valve allows enlargement of the compressor map in the surge area, with no significant impact in other operating conditions.
The extra compressor surge so obtained can enable a significant torque increase in the low end region of engine speed.
According to another embodiment, the internal surface of the duct is provided with a tapered portion having a tapered duct opening, the diameter of the duct upstream of the tapered portion being larger than the diameter of the duct downstream of the tapered portion.
An advantage of this embodiment is that it allows to optimize the duct insertion area.
According to another embodiment, the tapered portion is provided only on part of the internal surface of the duct.
An advantage of this embodiment is that it allows to provide a swirl to the air stream entering the valve.
According to another embodiment, a diameter of the duct upstream of the tapered portion is comprised between 1.3 and 3 times the diameter of the compressor at the wheel inlet.
According to still another embodiment, a tapered duct opening angle is comprised between 30° and 70°.
An advantage of this embodiment is that it allows to optimize the opening angle of the tapered duct.
According to a still another embodiment, a distance of the tapered portion to the compressor wheel inlet is comprised between 1 and 3 times the diameter of the compressor at the wheel inlet.
An advantage of this embodiment is that it allows an optimal distance from the inlet to the compressor wheel.
The invention further comprises an automotive system equipped with a long route (low pressure) EGR circuit and a long route (low pressure) Exhaust Gas Recirculation (EGR) valve having the mentioned features.
BRIEF DESCRIPTION OF THE DRAWINGS
The various embodiments will now be described, by way of example, with reference to the accompanying drawings, wherein like numerals denote like elements, and in which:
Figure 1 shows an automotive system;
Figure 2 is a cross-section of an internal combustion engine belonging to the automotive system of figure 1;
Figure 3 shows a portion of the automotive system of Figure 1 provided with a long route Exhaust Gas Recirculation (EGR) valve according to an embodiment of the invention; and
Figures 4-6 shows various embodiments of the long route Exhaust Gas Recirculation (EGR) valve, according to the invention.
DETAILED DESCRIPTION
Exemplary embodiments will now be described with reference to the enclosed drawings without intent to limit application and uses.
Some embodiments may include an automotive system 100, as shown in Figures 1 and 2, that includes an internal combustion engine (ICE) 110 having an engine block 120 defining at least one cylinder 125 having a piston 140 coupled to rotate a crankshaft 145. A cylinder head 130 cooperates with the piston 140 to define a combustion chamber 150. A fuel and air mixture (not shown) is disposed in the combustion chamber 150 and ignited, resulting in hot expanding exhaust gasses causing reciprocal movement of the piston 140. The fuel is provided by at least one fuel injector 160 and the air through at least one intake port 210. The fuel is provided at high pressure to the fuel injector 160 from a fuel rail 170 in fluid communication with a high pressure fuel pump 180 that increases the pressure of the fuel received from a fuel source 190. Each of the cylinders 125 has at least two valves 215, actuated by a camshaft 135 rotating in time with the crankshaft 145. The valves 215 selectively allow air into the combustion chamber 150 from the port 210 and alternately allow exhaust gases to exit through a port 220. In some examples, a cam phaser 155 may selectively vary the timing between the camshaft 135 and the crankshaft 145.
The air may be distributed to the air intake port(s) 210 through an intake manifold 200. An air intake duct 205 may provide air from the ambient environment to the intake manifold 200.
In other embodiments, a throttle body 330 may be provided to regulate the flow of air into the manifold 200.
In still other embodiments, a forced air system such as a turbocharger 230, having a compressor 240 rotationally coupled to a turbine 250, may be provided. Rotation of the compressor 240 increases the pressure and temperature of the air in the duct 205 and manifold 200. A charge air cooler 260 disposed in the duct 205 may reduce the temperature of the air. The turbine 250 rotates by receiving exhaust gases from an exhaust manifold 225 that directs exhaust gases from the exhaust ports 220 and through a series of vanes prior to expansion through the turbine 250. The exhaust gases exit the turbine 250 and are directed into an exhaust system 270. This example shows a variable geometry turbine (VGT) with a VGT actuator 290 arranged to move a rack of vanes 295 in different positions, namely from a fully closed position to a fully open position, to alter the flow of the exhaust gases through the turbine 250. In other embodiments, the turbocharger 230 may be fixed geometry and/or include a waste gate.
The exhaust gases of the engine are directed into an exhaust system 270.
The exhaust system 270 may include an exhaust pipe 275 having one or more exhaust aftertreatment devices 280. The aftertreatment devices may be any device configured to change the composition of the exhaust gases. Some examples of aftertreatment devices 280 include, but are not limited to, catalytic converters (two and three way), oxidation catalysts, lean NOx traps, hydrocarbon adsorbers, selective catalytic reduction (SCR) systems, and particulate filters.
Other embodiments may include an exhaust gas recirculation (EGR) system 300 coupled between the exhaust manifold 225 and the intake manifold 200. The EGR system 300 may include an EGR cooler 310 to reduce the temperature of the exhaust gases in the EGR system 300. An EGR valve 320 regulates a flow of exhaust gases in the EGR system 300.
While the first EGR conduit defines a short route for the exhaust gas recirculation, in accordance with the present invention, a second EGR conduit 600 which fluidly connects the exhaust line downstream of the aftertreatment systems to the intake line upstream the intake manifold and is connected therein by the interposition of a three-way valve 500, may be provided. The second EGR conduit 600 defines a long route which comprises also a relevant portion of the exhaust line and a relevant portion of the intake line.
The automotive system 100 may further include an electronic control unit (ECU) 450 in communication with one or more sensors and/or devices associated with the ICE 110 and with a memory system and an interface bus. The ECU 450 may receive input signals from various sensors configured to generate the signals in proportion to various physical parameters associated with the ICE 110. The sensors include, but are not limited to, a mass airflow and temperature sensor 340, a manifold pressure and temperature sensor 350, a combustion pressure sensor that may be integral within glow plugs 360, coolant and oil temperature and level sensors 380, a fuel rail pressure sensor 400, a cam position sensor 410, a crank position sensor 420, exhaust pressure and temperature sensors 430, an EGR temperature sensor 440, and an accelerator pedal 447 position sensor 445. Furthermore, the ECU 450 may generate output signals to various control devices that are arranged to control the operation of the ICE 110, including, but not limited to, the fuel injectors 160, the throttle body 330, the EGR Valve 320, a Variable Geometry Turbine (VGT) actuator 290, and the cam phaser 155. Note, dashed lines are used to indicate communication between the ECU 450 and the various sensors and devices, but some are omitted for clarity.
Figure 3 shows a portion of the automotive system 100 of Figure 1, wherein a three-way long route EGR valve 500, according to various embodiments of the invention, may be located.
The EGR valve 500 intercepts air intake duct 205 and is provided with an inlet 520 connected to an outlet of an air filter (not represented for simplicity) in order to receive filtered air coming from the environment and is provided with an outlet 530 that is connected to the inlet of the compressor 240. A further inlet of the EGR valve 500 receives exhaust gas from a long route EGR conduit 600 in such a way that the junction between the long route EGR conduit 600 and the air path is represented by the EGR valve 500 itself.
The EGR valve 500 is provided with a duct 510 having an inlet 520 and an outlet 530. A compressor wheel seat 570 is located in the outlet 530 of the EGR valve 500.
More specifically, the duct 510 connects air intake duct 205 with the turbocharger compressor 240 inlet and is intercepted by a first flap 550.
Furthermore, the EGR valve 500 comprises a passage 540 connecting a long route EGR circuit outlet with the duct 510, such passage 540 being intercepted by a second flap 560.
With reference now to Figure 4, it is noted that several dimensional features of the EGR valve 500 can be defined according to the various embodiments described herein.
First, the passage 540 is inclined with respect to the duct 510 by an angle of inclination a comprised between 30° and 70°.
Also, the distance b from a downstream outlet 585 of the passage 540 to the compressor wheel seat 570 is comprised between 0 and 2.5 times the diameter of the compressor wheel (not represented for simplicity) and the distance c from the second flap 560 to an upstream outlet 565 of the passage 540 is comprised between 1 and 3 times the diameter of the passage 540.
Preferred values for the above parameters may be a = 45°, b = 0.5 times the diameter of the compressor wheel and c = 1 times the diameter of the passage 540.
Other values may be suitable, depending on the particular automotive system 100.
In Figure 5 a further embodiment of the long route Exhaust Gas Recirculation (EGR) valve 500, according to the invention, is represented.
In the embodiment of Figure 5, the internal surface of the duct 510 is provided with a tapered portion 590, the diameter of the duct 510 upstream of the tapered portion 590 being larger than the diameter of the duct 510 downstream of the tapered portion 590. A central portion of the duct 510, after the tapered portion 590, may be provided with a conical surface 580.
In particular, also in the embodiment of Figure 5, the passage 540 is inclined with respect to the duct 510 by an angle of inclination a comprised between 30° and 70° and the distance b from a downstream outlet 585 of the passage 540 to the compressor wheel seat 570 is comprised between 0 and 2.5 times the diameter of the compressor wheel (not represented for simplicity). Furthermore, the distance c from the second flap 560 to an upstream outlet 565 of the passage 540 is comprised between 1 and 3 times the diameter of the passage 540.
Also in this case, preferred values for the above features may be a = 45°, b = 0.5 times the diameter of the compressor wheel and c = 1 times the diameter of the passage 540.
Moreover, in view of the presence of the tapered portion 590, it is to be noted that the diameter of the duct 510 upstream of the tapered portion 590 may be comprised between 1.3 and 3 times the diameter of the compressor wheel, the tapered duct opening 590 angle β may be comprised between 30° and 70° and the distance e of the tapered portion from the compressor wheel may be comprised between 1 and 3 times the diameter of the compressor wheel.
Preferred values for the above parameters may be β = 50°, d = 2 times the diameter of the compressor wheel inlet and e = 2 times the diameter of the compressor wheel inlet.
In Figure 6 still another embodiment of the long route Exhaust Gas Recirculation (EGR) valve 500, according to the invention, is represented.
In the embodiment of Figure 6, the tapered portion 590 is provided only on part of the internal surface of the duct 510.
The valve according to the various embodiments of the invention, allows an enhanced surge line with respect to a baseline surge line in the compressor map, leading to an advantageous enlargement of the compressor map in the surge area, with no impact on other operating conditions.
The extra compressor surge can enable a significant torque increase in the low end region of engine speed.
While at least one exemplary embodiment has been presented in the foregoing summary and detailed description, it should be appreciated that a vast number of variations exist. It should also be appreciated that the exemplary embodiment or exemplary embodiments are only examples, and are not intended to limit the scope, applicability, or configuration in any way. Rather, the foregoing summary and detailed description will provide those skilled in the art with a convenient road map for implementing at least one exemplary embodiment, it being understood that various changes may be made in the function and arrangement of elements described in an exemplary embodiment without departing from the scope as set forth in the appended claims and their legal equivalents.
REFERENCE NUMBERS 100 automotive system 110 internal combustion engine (ICE) 120 engine block 125 cylinder 130 cylinder head 135 camshaft 140 piston 145 crankshaft 150 combustion chamber 155 cam phaser 160 fuel injector 170 fuel rail 180 fuel pump 190 fuel source 200 intake manifold 205 air intake duct 210 intake air port 215 valves of the cylinder 220 exhaust gas port 225 exhaust manifold 230 high pressure turbocharger 240 high pressure compressor 250 high pressure turbine 260 charge air cooler 270 exhaust system 275 exhaust pipe 280 exhaust aftertreatment device 290 VGT actuator 295 rack of vanes of the turbine 300 EGR system 310 EGR cooler 320 EGR valve 330 throttle body 340 mass airflow and temperature sensor 350 manifold pressure and temperature sensor 400 fuel rail pressure sensor 410 cam position sensor 420 crank position sensor 430 exhaust pressure and temperature sensor 445 accelerator pedal position sensor 447 accelerator pedal 450 electronic control unit (ECU) 500 long route EGR valve 510 duct 520 inlet of duct 530 outlet of duct 540 passage 550 flap in duct 560 flap in passage 565 upstream outlet of passage 570 compressor wheel seat 580 conical surface of duct 585 downstream outlet of passage 590 tapered portion 600 long route EGR circuit

Claims (7)

1. A long route Exhaust Gas Recirculation (EGR) valve (500) for a turbocharged automotive system (100) comprising a turbocharger compressor (240) and a long route EGR circuit (600), the valve (500) comprising: - a duct (510) having an inlet (520) and an outlet (530), the outlet (530) being provided with a compressor wheel seat (570), the duct (510) connecting an air intake duct (205) with a turbocharger compressor (240) inlet and being intercepted by a first flap (550); - a passage (540) connecting a long route EGR circuit outlet with the duct (510) and being intercepted by a second flap (560); wherein - the passage (540) is inclined with respect to the duct (510) by an angle of inclination (a) comprised between 30° and 70°; - a distance (b) from a downstream outlet (585) of the passage (540) into the duct (510) to the compressor wheel seat (570) is comprised between 0 and 2.5 times the diameter of the compressor wheel; and - a distance (c) from the second flap (560) to an upstream outlet (565) of the passage (540) into the duct (510) is comprised between 1 and 3 times the diameter of the passage (540).
2. The long route EGR valve (500) according to claim 1, wherein the internal surface of the duct (510) is provided with a tapered portion (590) having a tapered duct opening (590), the diameter of the duct (510) upstream of the tapered portion (590) being larger than the diameter of the duct (510) downstream of the tapered portion (590).
3. The long route EGR valve (500) according to claim 2, wherein the tapered portion (590) is provided only on part of the internal surface of the duct (510).
4. The long route EGR valve (500) according to claim 2 or 3, wherein a diameter (d) of the duct (510) upstream of the tapered portion (580) is comprised between 1.3 and 3 times the diameter of the compressor at the wheel inlet.
5. The long route EGR valve (500) according to claim 2 or 3, wherein a tapered duct opening (590) angle (β) is comprised between 30° and 70°.
6. The long route EGR valve (500) according to claim 2 or 3, wherein a distance (e) of the tapered portion to the compressor wheel inlet is comprised between 1 and 3 times the diameter of the compressor at the wheel inlet.
7. An automotive system (100) equipped with a long route EGR circuit (600) and a long route Exhaust Gas Recirculation (EGR) valve (500) according to any of the preceding claims.
GB1513163.4A 2015-07-27 2015-07-27 A long route EGR valve for a turbocharged automotive system Withdrawn GB2541167A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1513163.4A GB2541167A (en) 2015-07-27 2015-07-27 A long route EGR valve for a turbocharged automotive system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1513163.4A GB2541167A (en) 2015-07-27 2015-07-27 A long route EGR valve for a turbocharged automotive system

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GB201513163D0 GB201513163D0 (en) 2015-09-09
GB2541167A true GB2541167A (en) 2017-02-15

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010065531A (en) * 2008-09-08 2010-03-25 Denso Corp Egr integrated throttle device
US20120272646A1 (en) * 2011-04-27 2012-11-01 Denso Corporation Low pressure exhaust gas recirculation apparatus
WO2013105135A1 (en) * 2012-01-12 2013-07-18 三菱電機株式会社 Exhaust gas recirculation valve
US20140338769A1 (en) * 2012-01-06 2014-11-20 Lothar Schröder Mixing valve

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010065531A (en) * 2008-09-08 2010-03-25 Denso Corp Egr integrated throttle device
US20120272646A1 (en) * 2011-04-27 2012-11-01 Denso Corporation Low pressure exhaust gas recirculation apparatus
US20140338769A1 (en) * 2012-01-06 2014-11-20 Lothar Schröder Mixing valve
WO2013105135A1 (en) * 2012-01-12 2013-07-18 三菱電機株式会社 Exhaust gas recirculation valve

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