US20010017033A1 - Exhaust gas recirculation system for a turbocharged internal combustion engine - Google Patents
Exhaust gas recirculation system for a turbocharged internal combustion engine Download PDFInfo
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- US20010017033A1 US20010017033A1 US09/774,866 US77486601A US2001017033A1 US 20010017033 A1 US20010017033 A1 US 20010017033A1 US 77486601 A US77486601 A US 77486601A US 2001017033 A1 US2001017033 A1 US 2001017033A1
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- egr
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- wastegate
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/0065—Specific aspects of external EGR control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
- F02B29/04—Cooling of air intake supply
- F02B29/0406—Layout of the intake air cooling or coolant circuit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/04—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning exhaust conduits
-
- 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
- F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
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- 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
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
- F02M26/23—Layout, e.g. schematics
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
- F02B37/12—Control of the pumps
- F02B37/18—Control of the pumps by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
- F02B37/12—Control of the pumps
- F02B37/24—Control of the pumps by using pumps or turbines with adjustable guide vanes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/04—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning exhaust conduits
- F02D9/06—Exhaust brakes
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- 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
- F02M26/09—Constructional details, e.g. structural combinations of EGR systems and supercharger systems; Arrangement of the EGR and supercharger systems with respect to the engine
- F02M26/10—Constructional details, e.g. structural combinations of EGR systems and supercharger systems; Arrangement of the EGR and supercharger systems with respect to the engine having means to increase the pressure difference between the exhaust and intake system, e.g. venturis, variable geometry turbines, check valves using pressure pulsations or throttles in the air intake or exhaust system
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- 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
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
- F02M26/33—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage controlling the temperature of the recirculated gases
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Definitions
- the present invention generally relates to turbocharged internal combustion engines and more particularly relates to exhaust gas recirculation systems for turbocharged internal combustion engines having a wastegate.
- EGR exhaust gas recirculation
- NO X nitric oxide
- EGR involves routing a portion of the exhaust gas back into the intake air flow.
- intake air pressure e.g., most normally aspirated engines
- an EGR flow can be realized simply by connecting a conduit between the exhaust and intake ducts. The flow from the exhaust manifold is drawn to the lower pressure of the intake because of the negative pressure differential.
- an unfavorable pressure differential must be overcome.
- the recirculated exhaust gas flow is typically introduced into the intake air downstream of the turbocompressor and intercooler components in order to avoid degradation of these components.
- the intake air is pressurized at this location, presenting an unfavorable intake to exhaust pressure ratio for transporting EGR gases.
- Diesel engines with efficient, well-matched turbochargers have an insufficient exhaust-to-intake pressure differential during some operating states to induce an amount of EGR flow sufficient to reduce nitric oxide emissions in compliance with environmental emissions regulations. For example, when an engine is running at a low speed under a high load, the exhaust temperature can be hot enough that the intake manifold pressure is higher than the exhaust manifold pressure. If a connection is opened between the intake manifold and the exhaust manifold through the EGR system, air flows from the intake manifold into the exhaust manifold, rather than the desired flow from the exhaust manifold to the intake manifold.
- EGR systems which attempt to overcome this unfavorable pressure differential via a supplemental pump or compressor operable to force flow through the EGR duct from the exhaust manifold to the intake manifold.
- Such EGR compressors can be mechanically driven, electric, or exhaust-driven by a second turbocompressor. It is also known to provide a supplemental compressor in the EGR system to drive flow. However, they require a relatively large amount of energy which tends to substantially sacrifice fuel economy. These systems also increase the complexity and cost of assembling an engine.
- the wastegate bypass typically includes a modulating valve which modulates exhaust flow therethrough at a frequency synchronous with exhaust pulses.
- the modulating valve of the wastegate bypass has been known to experience reliability problems due to the harsh engine environment in which it operates.
- the modulating valve of the wastegate bypass typically operates in close proximity to the engine's combustion chambers where exhaust temperatures, gas pressures and engine vibrations are greater.
- variable geometry turbine with movable vanes that can be adjusted to vary the swallowing capacity and flow resistance of the turbine.
- this solution is only viable in situations where cost is not prohibitive, because variable geometry turbines are typically more expensive than wastegated turbines.
- the boost and rotor speed provided by the turbine become dependent upon swallowing capacity of the turbine which results in less than desirable engine performance at various engine operating conditions.
- An object of the present invention is to provide an improved exhaust gas recirculation (EGR) system for an internal combustion engine. Another object of the present invention is to provide an effective EGR system which is reasonably inexpensive.
- the present invention achieves these objects and overcomes deficiencies in the prior art by providing, in an embodiment, an EGR system that utilizes a valve located downstream of an exhaust turbine.
- the EGR system has a controller for controlling the valve to optimize engine performance and emissions depending upon the operating conditions.
- the present invention is generally directed to an EGR system for a turbocharged internal combustion engine.
- the engine includes a turbocharger having a compressor for compressing air delivered to an intake manifold and an exhaust turbine arranged in an exhaust duct for driving the compressor.
- the EGR system includes an EGR duct extending between the intake duct and exhaust duct to permit fluid communication therebetween.
- the EGR duct generally guides an EGR flow of exhaust gas from the exhaust duct to the intake duct to achieve a reduction in nitric oxide emissions from the engine.
- a throttle valve is arranged in the exhaust duct downstream of an inlet port which opens to the EGR duct. The throttle valve is controlled by a controller for selectively restricting the flow through the exhaust duct, and thereby varying backpressure upstream of the throttle valve, to adjust an amount of EGR flow through the EGR duct.
- a wastegate valve is arranged in parallel with the exhaust turbine and upstream of the throttle valve to bypass a portion of the exhaust gas flow around the turbine.
- the exhaust turbine may be of the fixed geometry type with a fixed swallowing capacity.
- the exhaust turbine is of the variable geometry type.
- the variable geometry turbine includes variable geometry vanes controlling the swallowing capacity of the turbine and the turbine efficiency.
- An actuator which is controlled by the controller, selectively adjusts the position of the variable geometry vanes to control the swallowing capacity of the turbine.
- the controller can at least partially close the throttle valve during starting conditions. This results in creating higher backpressure and the burning of fuel at a higher rate to achieve idle conditions. This results in a higher rate of heat transfer into the engine components.
- the EGR system of the invention can advantageously decrease the time needed to warm the engine.
- the controller can at least partially close the throttle valve during higher speed operation. This builds backpressure to provide compression resistance in the cylinders.
- the EGR system of the invention can be controlled in such a manner to provide a compression braking.
- a further advantage of the present invention is to provide an enhanced EGR system which has few parts and a reasonable cost.
- FIG. 1 is a schematic illustration of an exhaust gas recirculation system for an internal combustion engine in accordance with a first embodiment of the present invention.
- FIGS. 2 - 5 are schematic illustrations of exhaust gas recirculation systems of respective embodiments of the invention, each including a wastegate bypass duct capable of selectably directing a portion of exhaust flow around the exhaust turbine. More particularly:
- FIG. 2 illustrates a system having a throttle valve downstream of the turbine and downstream of a port from in which the wastegate flow exits the wastegate duct into the exhaust.
- FIG. 3 illustrates a system having a throttle valve downstream of the turbine for selective control of flow from turbine, but upstream of a port from in which the wastegate flow exits wastegate duct.
- FIG. 4 illustrates a system having a throttle valve upstream of the turbine and upstream of an inlet port into which the wastegate flow enters the wastegate duct.
- FIG. 5 illustrates a system having a throttle valve upstream of the turbine and downstream of an inlet port into which the wastegate flow enters the wastegate duct.
- FIGS. 1 - 5 schematically illustrate resptective embodiments of an internal combustion engine 10 equipped with an EGR system 12 , 14 , providing exhaust gas recirculation.
- the engine 10 includes an intake duct 16 having an intake manifold 18 delivering a flow of intake air to the engine cylinders 20 and an exhaust duct 22 having an exhaust manifold 24 carrying a flow of exhaust gas away from the cylinders 20 and ultimately to discharge into the ambient air, as indicated.
- the EGR system 14 carries an EGR flow from the exhaust duct 22 back to the intake duct 16 .
- the engine 10 includes a turbocharger 26 , 26 ′, as illustrated in FIGS. 1 and 2- 5 , respectively, for compressing the intake air in a conventional manner.
- the turbocharger 26 , 26 ′ includes an exhaust turbine 28 , 28 ′, respectively, arranged in the exhaust duct 22 that is driven by the exhaust flow therethrough.
- the exhaust turbine 28 , 28 ′ is drivingly connected to an intake compressor 30 via a common shaft 32 or other connection.
- the intake compressor 30 is arranged in the intake duct 16 to compress the intake air.
- a heat exchanger or intercooler 34 may also be arranged in the intake duct 16 downstream of the intake compressor 30 for cooling and increasing the density of the compressed intake air.
- the EGR system 12 , 14 includes an EGR duct 40 having an inlet port 42 connected to the exhaust duct 22 upstream of the exhaust turbine 28 , 28 ′ and an outlet port 44 connected to the intake duct 16 , preferably downstream of the intake compressor 30 and intercooler 34 .
- the exhaust gas flows through the EGR duct 40 , it preferably passes through an EGR cooler 46 to lower its temperature to around 250 to 300 degrees F., to thereby increase the density of the exhaust gases in the EGR flow to effect a more efficient reduction in nitric oxide emissions.
- an embodiment of the EGR system 12 , 14 includes an EGR valve 48 arranged in the EGR duct 40 , preferably upstream of the EGR cooler 46 .
- the EGR valve 48 may be a shutoff type valve which is selectively positioned in an open or closed position to selectively allow or shut off EGR flow.
- the EGR valve 48 can be operable in a modulating manner to selectively allow or restrict EGR flow.
- a controller 50 delivers a signal via line 52 which actuates the EGR valve 48 to restrict or turn off the EGR flow.
- the EGR valve 48 may be actuated to close during high transient torque demand situations, thereby shutting off flow through the EGR duct 40 .
- the EGR system 12 , 14 includes a throttle valve 54 , as illustrated in each of FIGS. 1 - 5 .
- the throttle valve 54 is located in the exhaust duct 22 downstream of the EGR inlet port 42 .
- the throttle valve 54 is operable to selectively restrict exhaust flow through the exhaust duct 22 , thereby increasing backpressure upstream of the throttle valve 54 and, in turn, increasing the pressure differential across between the exhaust duct 22 and intake duct 16 across the EGR duct 40 .
- the throttle valve 54 is located downstream of the exhaust turbine 28 , 28 ′ where the valve 54 is subjected to less severe engine vibrations, gas pressures and thermal loads. This advantageously allows the use of a less expensive throttle valve 54 with lower tolerance requirements than required for an embodiment wherein the throttle valve 54 is located upstream of the turbine 28 . Locating the throttle valve 54 downstream of the exhaust turbine 28 , 28 ′ also generally increases the life span of the throttle valve 54 and therefore the reliability of the engine 10 , 12 . However, in another embodiment of the invention, the throttle valve 54 can be located upstream of the turbine 28 , 28 ′.
- the controller 50 sends a signal via line 56 to the throttle valve 54 to selectively control the degree of opening of the throttle valve 54 which thereby provides a selected flow restriction in the exhaust duct 22 downstream of the EGR inlet port 42 .
- the restriction provided by the throttle valve 54 increases the back pressure in the exhaust duct 22 upstream of the throttle valve 54 which increases the portion of the exhaust flow introduced into the EGR duct 40 , thereby increasing the EGR flow.
- the greater EGR flow achieves a more environmentally friendly engine by effecting increased overall reductions in nitric oxide emissions.
- the controller 50 sends another signal via line 56 to the throttle valve 54 to provide a less restrictive restriction and thereby decrease the back pressure in the exhaust duct 22 and the amount of EGR flow. Decreasing EGR flow typically improves engine power, efficiency and performance.
- the controller 50 is capable of positioning the throttle valve 54 in an open position, a closed position, and variable positions therebetween.
- the controller 50 selectively positions the throttle valve 54 in response to one or more sensed parameters, such as engine load, engine speed, EGR flow rate or another parameter as delivered by a signal to the controller 50 via one or more input line 57 .
- the controller may partially close the throttle valve 54 to provide a relatively high restriction to increase back pressure at the EGR inlet port 42 and thereby increase the EGR flow.
- the controller 50 causes the throttle valve 54 to open, thereby decreasing the amount of flow restriction.
- the throttle valve 54 is useful for decreasing the warm up time for the engine 10 during initial engine starting.
- the throttle valve 54 may be fully or substantially closed by the controller 50 to provide upstream back pressure in the exhaust duct 22 .
- the engine 10 requires more fuel burn in order to achieve idle conditions.
- the higher fuel rate gives higher heat rejection to the engine coolant and, in turn, causes the engine 10 to warm up faster.
- EGR flow is usually avoided by closing the EGR valve 48 until the engine is warm, this reduces the time spent in a non-EGR/high nitric oxide (NO X ) emissions mode. By thus achieving a condition of EGR flow sooner, overall nitric oxide emissions are advantageously reduced.
- NO X non-EGR/high nitric oxide
- the throttle valve 54 may also be additionally used for compression braking. According to this feature, the throttle valve 54 may be fully or substantially closed by the controller 50 to provide for high compression in the engine's cylinders 20 . This may be used for compression braking to slow the speed of engine 10 .
- the exhaust turbine 28 is a variable geometry turbine.
- the variable geometry turbine 28 includes variable geometry vanes which can be adjusted by an actuator 62 to control the swallowing capacity of the turbine 28 .
- the variable geometry vanes also control the turbine efficiency.
- the actuator 62 may be controlled by the controller 50 via line 58 .
- the swallowing capacity (which can be controlled by either the variable geometry vanes or the throttle valve 54 ) can be controlled independently of the boost and rotor speed of the turbine 28 (which depends in part upon the position of the variable geometry vanes). It is an advantage that this provides for greater engine power, and improves specific fuel consumption and controllability.
- the throttle valve 54 may also be partially closed by the controller 50 at higher engine speeds to increase back pressure and provide for increased EGR flow.
- the EGR system 14 includes an exhaust turbine 28 ′ which can be a fixed geometry turbine.
- the exhaust duct 22 includes a wastegate duct 66 arranged in fluid parallel with the turbine 28 ′ for bypassing excess pressure build-up in the exhaust duct 22 upstream of the turbine 28 ′. More specifically, the wastegate duct 66 is connected in fluid communication with the exhaust duct 22 at an inlet port located upstream of the turbine 28 ′.
- the wastegate duct 66 is connected to return flow to the exhaust duct at a reentry point downstream of the turbine 28 ′.
- the reentry point of wastegate duct 66 into exhaust duct 22 is located upstream of the throttle valve 54 in the embodiment of FIG. 2. However, as illustrated in FIG. 3, the reentry point of wastegate duct 66 into exhaust duct 22 can be located downstream of the throttle valve 54 in another embodiment of the invention.
- the throttle valve 54 can be located upstream of the turbine, as illustrated in FIGS. 4 and 5.
- the throttle valve 54 is located upstream of the turbine 28 ′ and also upstream of the inlet port 42 to the wastegate duct 66 .
- the throttle valve 54 is located upstream of the turbine 28 ′ but downstream the inlet port 42 of the wastegate duct 66 .
- a wastegate valve 68 is located in the wastegate duct 66 .
- the wastegate valve 68 is operable to restrict or modulate flow through the wastegate duct 66 to control rotor speed and efficiency of the turbine 28 ′. In this manner, the condition of the wastegate valve 68 can be controlled in order to regulate performance of the engine 12 .
- the wastegate duct 66 and the wastegate valve 68 are effective to vary the swallowing capacity of the turbine 28 ′.
- the wastegate valve 68 is controlled by the controller 50 via line 70 .
- the embodiment including the throttle valve 54 in combination with fixed geometry turbine 28 ′ and wastegate duct 66 provides several advantages.
- One advantage is that EGR flow rate can be increased by providing a selective flow restriction by selectively closing the throttle valve 54 at part load and also at low speed/high load, thereby achieving the desired reduction rate in nitric oxide emissions to more easily comply with stringent emissions regulations.
- EGR flow rate By increasing EGR flow rate, the injection timing may be advanced and fuel consumption improved.
- the wastegate bypass 66 may discharge the wastegated exhaust flow either upstream as shown in FIG. 2, or downstream of the throttle valve 54 as shown in FIG. 3.
- the throttle valve 54 may also be arranged to act on all exhaust flow to the exhaust stacks as illustrated, or alternatively any portion of the exhaust flow to the exhaust stacks regardless of whether the throttle valve 54 is located upstream or downstream of the exhaust turbine 28 ′.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Supercharger (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
Abstract
An exhaust gas recirculation (EGR) enhancement system for a turbocharged internal combustion engine includes a throttle valve arranged in the exhaust duct of the engine, downstream of the EGR system. The throttle valve is controlled in response to engine load and engine speed to selectively provide back pressure upstream of the throttle valve to selectively drive an EGR exhaust flow through an EGR duct to the intake manifold. An embodiment of the EGR system includes a cooler that lowers the temperature of the EGR exhaust flow to provide better reductions in nitric oxide emissions. The turbine is equipped to allow excess pressure to be released through a wastegate duct arranged in fluid parallel with the exhaust turbine, thereby allowing for higher power and higher speeds.
Description
- This is a continuation in part of U.S. patent application Ser. No. 08/378,647, filed on Aug. 20, 1999.
- The present invention generally relates to turbocharged internal combustion engines and more particularly relates to exhaust gas recirculation systems for turbocharged internal combustion engines having a wastegate.
- In internal combustion engines, a process known as exhaust gas recirculation (EGR) is used to reduce the amount of nitric oxide (NOX) emissions. In general, EGR involves routing a portion of the exhaust gas back into the intake air flow. In an engine where exhaust back pressure is greater than intake air pressure (e.g., most normally aspirated engines) an EGR flow can be realized simply by connecting a conduit between the exhaust and intake ducts. The flow from the exhaust manifold is drawn to the lower pressure of the intake because of the negative pressure differential. However, in a turbocharged internal combustion engine having a charged intake, an unfavorable pressure differential must be overcome.
- More particularly, in turbocharged diesel engines, the recirculated exhaust gas flow is typically introduced into the intake air downstream of the turbocompressor and intercooler components in order to avoid degradation of these components. Unfortunately, the intake air is pressurized at this location, presenting an unfavorable intake to exhaust pressure ratio for transporting EGR gases. Diesel engines with efficient, well-matched turbochargers have an insufficient exhaust-to-intake pressure differential during some operating states to induce an amount of EGR flow sufficient to reduce nitric oxide emissions in compliance with environmental emissions regulations. For example, when an engine is running at a low speed under a high load, the exhaust temperature can be hot enough that the intake manifold pressure is higher than the exhaust manifold pressure. If a connection is opened between the intake manifold and the exhaust manifold through the EGR system, air flows from the intake manifold into the exhaust manifold, rather than the desired flow from the exhaust manifold to the intake manifold.
- Various EGR systems are known which attempt to overcome this unfavorable pressure differential via a supplemental pump or compressor operable to force flow through the EGR duct from the exhaust manifold to the intake manifold. Such EGR compressors can be mechanically driven, electric, or exhaust-driven by a second turbocompressor. It is also known to provide a supplemental compressor in the EGR system to drive flow. However, they require a relatively large amount of energy which tends to substantially sacrifice fuel economy. These systems also increase the complexity and cost of assembling an engine.
- Systems are also known which attempt to achieve exhaust-to-intake EGR flow by increasing the pressure in the exhaust manifold (backpressure). This can be achieved with careful engine design choices, such as the selection of a turbocharger having a particular fixed-geometry turbine size to yield an appropriate pressure differential. To increase EGR flow in a particular engine, a fixed-geometry turbocharger could be selected to have a relatively small size, having a correspondingly small swallowing capacity and a high flow restriction. The high flow restriction would provide increased backpressure upstream of the turbine sufficient to drive the EGR flow back to the intake manifold. Unfortunately, a turbocharger turbine and compressor selected to provide such backpressure are poorly matched, and such a system results in less-than-optimal performance, sacrificing fuel economy and power, especially at higher engine speeds.
- In conjunction with the relatively small sized turbine discussed in the aforementioned paragraph, it is further known to provide a wastegate for bypassing excess amounts of exhaust backpressure in an attempt to thereby increase engine power at relatively high speeds. The wastegate bypass typically includes a modulating valve which modulates exhaust flow therethrough at a frequency synchronous with exhaust pulses. Although engine efficiency and power are improved overall, this solution still results in a smaller turbine being selected for the engine than is desired for optimal performance and fuel economy. Furthermore, the modulating valve of the wastegate bypass has been known to experience reliability problems due to the harsh engine environment in which it operates. In particular, the modulating valve of the wastegate bypass typically operates in close proximity to the engine's combustion chambers where exhaust temperatures, gas pressures and engine vibrations are greater. These factors decrease control over the wastegate valve which in turn decreases control over EGR flow and the engine in general.
- In an attempt to overcome the problems of wastegated turbines having a small, fixed swallowing capacity, it is known to provide a variable geometry turbine with movable vanes that can be adjusted to vary the swallowing capacity and flow resistance of the turbine. However, this solution is only viable in situations where cost is not prohibitive, because variable geometry turbines are typically more expensive than wastegated turbines. Moreover, in these systems the boost and rotor speed provided by the turbine become dependent upon swallowing capacity of the turbine which results in less than desirable engine performance at various engine operating conditions.
- Given that emissions regulations are increasingly becoming more stringent, an improved EGR system is needed.
- An object of the present invention is to provide an improved exhaust gas recirculation (EGR) system for an internal combustion engine. Another object of the present invention is to provide an effective EGR system which is reasonably inexpensive. The present invention achieves these objects and overcomes deficiencies in the prior art by providing, in an embodiment, an EGR system that utilizes a valve located downstream of an exhaust turbine. In an embodiment, the EGR system has a controller for controlling the valve to optimize engine performance and emissions depending upon the operating conditions.
- The present invention is generally directed to an EGR system for a turbocharged internal combustion engine. The engine includes a turbocharger having a compressor for compressing air delivered to an intake manifold and an exhaust turbine arranged in an exhaust duct for driving the compressor. The EGR system includes an EGR duct extending between the intake duct and exhaust duct to permit fluid communication therebetween. The EGR duct generally guides an EGR flow of exhaust gas from the exhaust duct to the intake duct to achieve a reduction in nitric oxide emissions from the engine. A throttle valve is arranged in the exhaust duct downstream of an inlet port which opens to the EGR duct. The throttle valve is controlled by a controller for selectively restricting the flow through the exhaust duct, and thereby varying backpressure upstream of the throttle valve, to adjust an amount of EGR flow through the EGR duct.
- According to an embodiment of the present invention, a wastegate valve is arranged in parallel with the exhaust turbine and upstream of the throttle valve to bypass a portion of the exhaust gas flow around the turbine. According to this embodiment, the exhaust turbine may be of the fixed geometry type with a fixed swallowing capacity.
- According to another embodiment, the exhaust turbine is of the variable geometry type. The variable geometry turbine includes variable geometry vanes controlling the swallowing capacity of the turbine and the turbine efficiency. An actuator, which is controlled by the controller, selectively adjusts the position of the variable geometry vanes to control the swallowing capacity of the turbine.
- In an embodiment, the controller can at least partially close the throttle valve during starting conditions. This results in creating higher backpressure and the burning of fuel at a higher rate to achieve idle conditions. This results in a higher rate of heat transfer into the engine components. In such a manner, the EGR system of the invention can advantageously decrease the time needed to warm the engine.
- In an embodiment, the controller can at least partially close the throttle valve during higher speed operation. This builds backpressure to provide compression resistance in the cylinders. Advantageously, the EGR system of the invention can be controlled in such a manner to provide a compression braking.
- It is therefore an advantage of the present invention to provide an improved way to selectively increase or control the EGR flow in a turbocharged internal combustion engine.
- For turbocharged internal combustion engines that include a variable geometry turbine, it is a further advantage of the present invention to decouple the swallowing capacity of the turbine from the boost and rotor speed of the turbine.
- For turbocharged internal combustion engines that include a wastegated turbine, another advantage of the present invention is to provide a turbine that has an increased swallowing capacity to provide for increased engine efficiency and power while maintaining the desired EGR flow under certain engine conditions.
- A further advantage of the present invention is to provide an enhanced EGR system which has few parts and a reasonable cost.
- These and other features and advantages of the invention are disclosed in, and will become apparent from, the detailed description of the presently preferred embodiments and from the drawings.
- FIG. 1 is a schematic illustration of an exhaust gas recirculation system for an internal combustion engine in accordance with a first embodiment of the present invention.
- FIGS.2-5 are schematic illustrations of exhaust gas recirculation systems of respective embodiments of the invention, each including a wastegate bypass duct capable of selectably directing a portion of exhaust flow around the exhaust turbine. More particularly:
- FIG. 2 illustrates a system having a throttle valve downstream of the turbine and downstream of a port from in which the wastegate flow exits the wastegate duct into the exhaust.
- FIG. 3 illustrates a system having a throttle valve downstream of the turbine for selective control of flow from turbine, but upstream of a port from in which the wastegate flow exits wastegate duct.
- FIG. 4 illustrates a system having a throttle valve upstream of the turbine and upstream of an inlet port into which the wastegate flow enters the wastegate duct.
- FIG. 5 illustrates a system having a throttle valve upstream of the turbine and downstream of an inlet port into which the wastegate flow enters the wastegate duct.
- Now referring to the drawings, wherein like numerals designate like parts, FIGS.1-5 schematically illustrate resptective embodiments of an
internal combustion engine 10 equipped with anEGR system engine 10 includes anintake duct 16 having anintake manifold 18 delivering a flow of intake air to theengine cylinders 20 and anexhaust duct 22 having anexhaust manifold 24 carrying a flow of exhaust gas away from thecylinders 20 and ultimately to discharge into the ambient air, as indicated. In general, theEGR system 14 carries an EGR flow from theexhaust duct 22 back to theintake duct 16. - The
engine 10 includes aturbocharger turbocharger exhaust turbine exhaust duct 22 that is driven by the exhaust flow therethrough. Theexhaust turbine intake compressor 30 via acommon shaft 32 or other connection. Theintake compressor 30 is arranged in theintake duct 16 to compress the intake air. A heat exchanger orintercooler 34 may also be arranged in theintake duct 16 downstream of theintake compressor 30 for cooling and increasing the density of the compressed intake air. - To facilitate the EGR flow, the
EGR system EGR duct 40 having aninlet port 42 connected to theexhaust duct 22 upstream of theexhaust turbine outlet port 44 connected to theintake duct 16, preferably downstream of theintake compressor 30 andintercooler 34. As the exhaust gas flows through theEGR duct 40, it preferably passes through anEGR cooler 46 to lower its temperature to around 250 to 300 degrees F., to thereby increase the density of the exhaust gases in the EGR flow to effect a more efficient reduction in nitric oxide emissions. - To selectively permit or restrict EGR flow, an embodiment of the
EGR system EGR valve 48 arranged in theEGR duct 40, preferably upstream of theEGR cooler 46. TheEGR valve 48 may be a shutoff type valve which is selectively positioned in an open or closed position to selectively allow or shut off EGR flow. Alternatively, theEGR valve 48 can be operable in a modulating manner to selectively allow or restrict EGR flow. Under certain operating conditions where EGR flow is unnecessary or could potentially create adverse effects to the engine, acontroller 50 delivers a signal vialine 52 which actuates theEGR valve 48 to restrict or turn off the EGR flow. For example, theEGR valve 48 may be actuated to close during high transient torque demand situations, thereby shutting off flow through theEGR duct 40. - For selectively controlling exhaust backpressure and thereby controlling the EGR flow, the
EGR system throttle valve 54, as illustrated in each of FIGS. 1-5. In accordance with an embodiment of the present invention, thethrottle valve 54 is located in theexhaust duct 22 downstream of theEGR inlet port 42. In general, thethrottle valve 54 is operable to selectively restrict exhaust flow through theexhaust duct 22, thereby increasing backpressure upstream of thethrottle valve 54 and, in turn, increasing the pressure differential across between theexhaust duct 22 andintake duct 16 across theEGR duct 40. By using thethrottle valve 54 to control backpressure in this manner, the EGR flow can be controlled. - In a preferred embodiment, as illustrated in FIGS.1-3, the
throttle valve 54 is located downstream of theexhaust turbine valve 54 is subjected to less severe engine vibrations, gas pressures and thermal loads. This advantageously allows the use of a lessexpensive throttle valve 54 with lower tolerance requirements than required for an embodiment wherein thethrottle valve 54 is located upstream of theturbine 28. Locating thethrottle valve 54 downstream of theexhaust turbine throttle valve 54 and therefore the reliability of theengine throttle valve 54 can be located upstream of theturbine - To increase the EGR flow, the
controller 50 sends a signal vialine 56 to thethrottle valve 54 to selectively control the degree of opening of thethrottle valve 54 which thereby provides a selected flow restriction in theexhaust duct 22 downstream of theEGR inlet port 42. The restriction provided by thethrottle valve 54 increases the back pressure in theexhaust duct 22 upstream of thethrottle valve 54 which increases the portion of the exhaust flow introduced into theEGR duct 40, thereby increasing the EGR flow. The greater EGR flow achieves a more environmentally friendly engine by effecting increased overall reductions in nitric oxide emissions. To decrease EGR flow, thecontroller 50 sends another signal vialine 56 to thethrottle valve 54 to provide a less restrictive restriction and thereby decrease the back pressure in theexhaust duct 22 and the amount of EGR flow. Decreasing EGR flow typically improves engine power, efficiency and performance. - In an embodiment, the
controller 50 is capable of positioning thethrottle valve 54 in an open position, a closed position, and variable positions therebetween. Thecontroller 50 selectively positions thethrottle valve 54 in response to one or more sensed parameters, such as engine load, engine speed, EGR flow rate or another parameter as delivered by a signal to thecontroller 50 via one ormore input line 57. For example, at lower speeds, such as at low speed and high or partial loads, the controller may partially close thethrottle valve 54 to provide a relatively high restriction to increase back pressure at theEGR inlet port 42 and thereby increase the EGR flow. At higher engine speeds, for example, thecontroller 50 causes thethrottle valve 54 to open, thereby decreasing the amount of flow restriction. Thecontroller 50 is designed to control thethrottle valve 54 in a desirable manner which may depend, for example, upon the particular configuration of theengine 10, the desired amount of nitric oxide emissions, the desired performance and output requirements of theengine 10, etc. In an embodiment, thethrottle valve 54 is modulated, the position typically being updated at a relatively low frequency corresponding to transitions between engine speed and load on the order of every couple of seconds. - In addition to increasing EGR flow, the
throttle valve 54 is useful for decreasing the warm up time for theengine 10 during initial engine starting. For example, during engine startup, thethrottle valve 54 may be fully or substantially closed by thecontroller 50 to provide upstream back pressure in theexhaust duct 22. As a result, theengine 10 requires more fuel burn in order to achieve idle conditions. The higher fuel rate gives higher heat rejection to the engine coolant and, in turn, causes theengine 10 to warm up faster. Moreover, since EGR flow is usually avoided by closing theEGR valve 48 until the engine is warm, this reduces the time spent in a non-EGR/high nitric oxide (NOX) emissions mode. By thus achieving a condition of EGR flow sooner, overall nitric oxide emissions are advantageously reduced. - The
throttle valve 54 may also be additionally used for compression braking. According to this feature, thethrottle valve 54 may be fully or substantially closed by thecontroller 50 to provide for high compression in the engine'scylinders 20. This may be used for compression braking to slow the speed ofengine 10. - In the
EGR system 12 illustrated in FIG. 1, theexhaust turbine 28 is a variable geometry turbine. Thevariable geometry turbine 28 includes variable geometry vanes which can be adjusted by anactuator 62 to control the swallowing capacity of theturbine 28. The variable geometry vanes also control the turbine efficiency. Theactuator 62 may be controlled by thecontroller 50 vialine 58. By combining thevariable geometry turbine 28 with thethrottle valve 54, the swallowing capacity (which can be controlled by either the variable geometry vanes or the throttle valve 54) can be controlled independently of the boost and rotor speed of the turbine 28 (which depends in part upon the position of the variable geometry vanes). It is an advantage that this provides for greater engine power, and improves specific fuel consumption and controllability. In theEGR system 12 of FIG. 1, thethrottle valve 54 may also be partially closed by thecontroller 50 at higher engine speeds to increase back pressure and provide for increased EGR flow. - In the embodiments illustrated in FIGS.2-5, the
EGR system 14 includes anexhaust turbine 28′ which can be a fixed geometry turbine. Theexhaust duct 22 includes awastegate duct 66 arranged in fluid parallel with theturbine 28′ for bypassing excess pressure build-up in theexhaust duct 22 upstream of theturbine 28′. More specifically, thewastegate duct 66 is connected in fluid communication with theexhaust duct 22 at an inlet port located upstream of theturbine 28′. Thewastegate duct 66 is connected to return flow to the exhaust duct at a reentry point downstream of theturbine 28′. The reentry point ofwastegate duct 66 intoexhaust duct 22 is located upstream of thethrottle valve 54 in the embodiment of FIG. 2. However, as illustrated in FIG. 3, the reentry point ofwastegate duct 66 intoexhaust duct 22 can be located downstream of thethrottle valve 54 in another embodiment of the invention. - Alternatively, the
throttle valve 54 can be located upstream of the turbine, as illustrated in FIGS. 4 and 5. In the system of FIG. 4, thethrottle valve 54 is located upstream of theturbine 28′ and also upstream of theinlet port 42 to thewastegate duct 66. In the system of FIG. 5, however, thethrottle valve 54 is located upstream of theturbine 28′ but downstream theinlet port 42 of thewastegate duct 66. - As also illustrated in FIGS.2-5, a
wastegate valve 68 is located in thewastegate duct 66. Thewastegate valve 68 is operable to restrict or modulate flow through thewastegate duct 66 to control rotor speed and efficiency of theturbine 28′. In this manner, the condition of thewastegate valve 68 can be controlled in order to regulate performance of theengine 12. Thewastegate duct 66 and thewastegate valve 68 are effective to vary the swallowing capacity of theturbine 28′. Thewastegate valve 68 is controlled by thecontroller 50 vialine 70. - The embodiment including the
throttle valve 54 in combination with fixedgeometry turbine 28′ andwastegate duct 66 provides several advantages. One advantage is that EGR flow rate can be increased by providing a selective flow restriction by selectively closing thethrottle valve 54 at part load and also at low speed/high load, thereby achieving the desired reduction rate in nitric oxide emissions to more easily comply with stringent emissions regulations. By increasing EGR flow rate, the injection timing may be advanced and fuel consumption improved. Because thethrottle valve 54 may be used to build back pressure in theexhaust duct 22, the swallowing capacity of the exhaust turbine is not as critical for facilitating EGR flow, and therefore a larger turbine 64 can be selected if desired to provide a better matchedturbocharger 26 and therefore a more efficient, better performingengine 12, particularly at higher engine speeds. Boost power may also be lowered with this embodiment to increase engine power. Thethrottle valve 54 may also be used for active compensation for variations in stack restrictions from one installation to another or changes in stack restriction over time. Thethrottle valve 54 may also be used for active compensation for variations between engines or for engine degradation over time. - In the systems wherein the
throttle valve 54 is located downstream of theturbine 28′, thewastegate bypass 66 may discharge the wastegated exhaust flow either upstream as shown in FIG. 2, or downstream of thethrottle valve 54 as shown in FIG. 3. Thethrottle valve 54 may also be arranged to act on all exhaust flow to the exhaust stacks as illustrated, or alternatively any portion of the exhaust flow to the exhaust stacks regardless of whether thethrottle valve 54 is located upstream or downstream of theexhaust turbine 28′. - All of the references cited herein, including patents, patent applications and publications are hereby incorporated in their entireties by reference. While this invention has been described in connection with exemplary embodiments, various changes and modifications will be apparent to those of ordinary skill in the art. Such changes and modifications may be made without departing from within the spirit and the scope of the invention. Accordingly, the appended claims are intended to cover such changes and modifications.
Claims (30)
1. An internal combustion engine having an intake duct, an exhaust duct, and an exhaust gas recirculation system comprising:
an EGR duct connected in fluid communication with the exhaust duct for guiding an EGR flow of exhaust gas from the exhaust duct to the intake duct;
an EGR cooler located in the EGR duct for cooling the EGR flow prior to entering the intake duct;
an exhaust turbine in the exhaust duct downstream of said EGR duct, the turbine driving an intake compressor;
a throttle valve arranged in the exhaust duct downstream of said EGR duct operable to selectably restrict flow through the exhaust duct; and
a controller operable to adjust the throttle valve;
a wastegate duct in communication with the exhaust duct for bypassing a wastegate flow from the exhaust duct upstream of the exhaust turbine to reenter the exhaust duct downstream of the turbine; and
a wastegate valve located in the wastegate bypass duct for selectively restricting said wastegate flow.
2. An engine according to , wherein the throttle valve is located downstream of the exhaust turbine.
claim 1
3. An engine according to , wherein the throttle valve is located downstream of a port from in which the wastegate flow exits the wastegate duct into the exhaust.
claim 2
4. An engine according to , wherein the throttle valve is located upstream of a port from in which the wastegate flow exits wastegate duct.
claim 2
5. An engine according to , wherein the throttle valve is located upstream of the exhaust turbine.
claim 1
6. An engine according to , wherein the throttle valve is located upstream of an inlet port into which the wastegate flow enters the wastegate duct.
claim 5
7. An engine according to , wherein the throttle valve is located downstream of an inlet port into which the wastegate flow enters the wastegate duct.
claim 5
8. An engine according to , wherein the controller adjusts the throttle valve to vary back pressure in the exhaust duct to control a rate of said EGR flow.
claim 1
9. An engine according to , wherein the controller modulates the throttle valve as a function of engine speed.
claim 8
10. An engine according to , wherein the controller substantially closes the throttle valve during a starting operation of the engine.
claim 8
11. An engine according to , wherein the turbine is of a type having fixed geometry vanes.
claim 6
12. An engine according to , wherein the controller is operable to substantially close the throttle valve to cause back pressure in the exhaust duct for providing compression braking.
claim 1
13. An engine according to , further comprising an EGR valve located in the EGR duct adjustable to vary the EGR flow.
claim 1
14. An engine according to , further comprising an intercooler located in the intake duct located upstream of the EGR duct.
claim 1
15. An exhaust gas recirculation system for an internal combustion engine having an intake duct, an exhaust duct, and a turbocharger with a turbine located in the exhaust duct, the turbocharger driving a compressor located in the intake for charging air in the intake duct, the exhaust gas recirculation system comprising:
an EGR duct connected in fluid communication with the exhaust duct upstream of the turbine for guiding an EGR flow of exhaust gas from the exhaust duct to the intake duct;
an EGR cooler located in the EGR duct for cooling the EGR flow prior to entering the intake duct;
a throttle valve arranged in the exhaust duct downstream of said EGR duct operable to selectably restrict flow through the exhaust duct;
a controller operable to adjust the throttle valve for controlling back pressure in the exhaust duct;
a wastegate duct in communication with the exhaust duct for bypassing a wastegate flow from the exhaust duct upstream of the exhaust turbine to reenter the exhaust duct downstream of the turbine; and
a wastegate valve located in the wastegate bypass duct for selectively restricting said wastegate flow.
16. An exhaust gas recirculation system according to , wherein the throttle valve is located downstream of the exhaust turbine.
claim 15
17. An exhaust gas recirculation system according to , wherein the throttle valve is located downstream of a port from in which the wastegate flow exits the wastegate duct into the exhaust.
claim 16
18. An exhaust gas recirculation system according to , wherein the throttle valve is located upstream of a port from in which the wastegate flow exits wastegate duct.
claim 16
19. An exhaust gas recirculation system according to , wherein the throttle valve is located upstream of the exhaust turbine.
claim 15
20. An exhaust gas recirculation system according to , wherein the throttle valve is located upstream of an inlet port into which the wastegate flow enters the wastegate duct.
claim 19
21. An exhaust gas recirculation system according to , wherein the throttle valve is located downstream of an inlet port into which the wastegate flow enters the wastegate duct.
claim 19
22. An exhaust gas recirculation system according to , wherein the controller adjusts the throttle valve to increase back pressure in the exhaust duct for controlling a rate of said EGR flow.
claim 15
23. An exhaust gas recirculation system according to , wherein the controller modulates the throttle valve as a function of one or more engine operating parameters.
claim 22
24. An exhaust gas recirculation system according to , wherein one of said engine operating parameters is engine speed.
claim 23
25. An exhaust gas recirculation system according to , wherein one of said engine operating parameters is engine load.
claim 23
26. An exhaust gas recirculation system according to , wherein the controller is operable to substantially close the throttle valve during a starting operation of the engine.
claim 22
27. An exhaust gas recirculation system according to , wherein the turbine is of a fixed geometry turbine.
claim 15
28. An exhaust gas recirculation system according to , wherein said controller is operable to adjust the wastegate valve.
claim 15
29. An exhaust gas recirculation system according to , wherein the controller is operable to substantially close the throttle valve to cause back pressure in the exhaust duct for providing compression braking.
claim 15
30. An exhaust gas recirculation system according to , further comprising an EGR valve located in the EGR duct adjustable to vary the EGR flow.
claim 15
Priority Applications (1)
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US09/774,866 US6311494B2 (en) | 1999-08-20 | 2001-01-31 | Exhaust gas recirculation system for a turbocharged internal combustion engine |
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US09/378,647 US6354084B1 (en) | 1999-08-20 | 1999-08-20 | Exhaust gas recirculation system for a turbocharged internal combustion engine |
US09/774,866 US6311494B2 (en) | 1999-08-20 | 2001-01-31 | Exhaust gas recirculation system for a turbocharged internal combustion engine |
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US09/378,647 Continuation-In-Part US6354084B1 (en) | 1999-08-20 | 1999-08-20 | Exhaust gas recirculation system for a turbocharged internal combustion engine |
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US20010017033A1 true US20010017033A1 (en) | 2001-08-30 |
US6311494B2 US6311494B2 (en) | 2001-11-06 |
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US09/378,647 Expired - Lifetime US6354084B1 (en) | 1999-08-20 | 1999-08-20 | Exhaust gas recirculation system for a turbocharged internal combustion engine |
US09/774,866 Expired - Lifetime US6311494B2 (en) | 1999-08-20 | 2001-01-31 | Exhaust gas recirculation system for a turbocharged internal combustion engine |
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Also Published As
Publication number | Publication date |
---|---|
US6354084B1 (en) | 2002-03-12 |
GB2353328A (en) | 2001-02-21 |
US6311494B2 (en) | 2001-11-06 |
GB0020230D0 (en) | 2000-10-04 |
GB2353328B (en) | 2004-01-21 |
JP2001090616A (en) | 2001-04-03 |
DE10040613A1 (en) | 2001-03-15 |
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