EP0814235B1 - Radial turbine for a turbocharger - Google Patents

Radial turbine for a turbocharger Download PDF

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Publication number
EP0814235B1
EP0814235B1 EP97106344A EP97106344A EP0814235B1 EP 0814235 B1 EP0814235 B1 EP 0814235B1 EP 97106344 A EP97106344 A EP 97106344A EP 97106344 A EP97106344 A EP 97106344A EP 0814235 B1 EP0814235 B1 EP 0814235B1
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EP
European Patent Office
Prior art keywords
ring
directing
turbine
control
channel
Prior art date
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Expired - Lifetime
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EP97106344A
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German (de)
French (fr)
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EP0814235A1 (en
Inventor
Wolfgang Dipl.-Ing. Heintze
Jürgen Dipl.-Ing. Nagel
Horst Dipl.-Ing. Buschmann
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Caterpillar Motoren GmbH and Co KG
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MaK Motoren GmbH and Co KG
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Publication of EP0814235A1 publication Critical patent/EP0814235A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D17/00—Regulating or controlling by varying flow
    • F01D17/10—Final actuators
    • F01D17/12—Final actuators arranged in stator parts
    • F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
    • F01D17/141—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path
    • F01D17/143—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path the shiftable member being a wall, or part thereof of a radial diffuser
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D17/00—Regulating or controlling by varying flow
    • F01D17/10—Final actuators
    • F01D17/12—Final actuators arranged in stator parts
    • F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
    • F01D17/16—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of nozzle vanes
    • F01D17/167—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of nozzle vanes of vanes moving in translation

Definitions

  • the invention relates to a radial turbine for a turbocharger of a supercharged internal combustion engine with an adjustable turbine guide that at least two separate gas supply channels which, by means of one of two control rings formed guide ring in a turbine blade surrounding guide cylinder, in two different Working positions is displaceable and the turbine guide from the guide ring with the two control rings exists, between which gas supply channels are different Cross-section over a dividing partition are formed.
  • An exhaust gas turbocharger is known from DE 42 15 301 A1 a radial turbine known to change one effective cross section of the guide for the supplied Exhaust gas flow arranged an adjustable control ring is. This comprises two feed channels with different ones Cross sections for full load and part load are designed, with one feed channel switched on is to a correspondingly effective cross section to surrender.
  • the invention is based, for one Generic arrangement with a turbine guide a simple adjustment of the control rings with to enable self-retention.
  • the main advantages achieved with the invention consist of an adjustable guide ring with two Gas routing channels for full and partial load of the turbine guide by means of a compressed air reservoir and electrically controllable solenoid valves in one Position for high boost pressure and therefore strong torque and in another position for an optimal, ignition pressure and consumption optimized Full load operation is adjustable.
  • the guide ring can be completed after a Adjustment process in stable self-retention in its occupied position remain. After reaching the guide ring remains in the desired position Self-retention and also this condition is still through the pressures developed by the internal combustion engine Supported on the air and exhaust side.
  • the enlarged Area of the intermediate wall on which the exhaust gas pressure is and due to the different throttling of the ring channels due to a one-sided seal a resulting holding force that secures the guide ring stops in the position assigned by the controller.
  • the guide ring essentially comprises two control rings, which with the turbine housing each have an annular channel to lock. These ring channels are with the compressed air reservoir and a boost pressure sensor connected.
  • the separating the gas guide channels of the guide ring Partition wall is in the two possible Positions in a wall of the turbine housing in held a seat, each with a flush gas duct results.
  • A is used for the starting process and for idling mechanical lock, consisting of a holding pin, which is pneumatically controlled and ensures that the guide ring is not caused by vibrations of the internal combustion engine uncontrolled from a set Position moves.
  • the position of the guide ring is preferably by means of a memory-oriented control, by a Control device via solenoid valves depending set by parameters of the internal combustion engine.
  • parameters of the internal combustion engine can, for example, the speed of the Internal combustion engine, the speed of the exhaust gas turbine, the Pressure in the charge air pickup or the fuel injection pump be a combination of these Parameter is possible.
  • An exhaust gas turbocharger 1 for an internal combustion engine 13 essentially comprises a compressor 3 with a Exhaust gas turbine 2. Via a control device 18 the exhaust gas turbine 2 by a boost pressure sensor 14 and a compressed air reservoir 8 depending on compressed air can be fed from the load state of the internal combustion engine.
  • a turbine guide device is located in the exhaust gas turbine 2 4 with a guide ring L, consisting of two control rings Sl and S2 with gas routing channels 11, 12, arranged different cross-section.
  • the guide ring L can be moved to two positions T and V. be, the T position for a high Boost pressure is there and a strong torque on the output flange the internal combustion engine 13 allowed.
  • the V-position stands for an optimal ignition pressure-compatible and consumption-optimized full-load operation.
  • the turbine guide 4 can by means of the compressed air reservoir 8 and electrically controllable solenoid valves 9 in the control device 18 in the both positions T and V can be adjusted. Because of constructive measures on the control device 4 can the guide ring L in the desired position in the Self-retention remain without constant supply of Compressed air from an external storage.
  • switching criteria 15 run over in the memory 10 of the controller are filed. These can be: speed of the Charging device 1, speed of the internal combustion engine 13, impermissible boost pressure or the injected Amount of fuel or a combination of these sizes.
  • the solenoid valves 9 are briefly vented.
  • the upcoming one Boost pressure in the ring channel 5a presses the guide ring L from position T to position V. Due to the modified effective guide ring surface in the gas duct 11 the boost pressure changes to a desired level.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supercharger (AREA)

Description

Die Erfindung bezieht sich auf eine Radialturbine für einen Turbolader einer aufgeladenen Brennkraftmaschine mit einer verstellbaren Turbinenleiteinrichtung, die mindestens zwei voneinander getrennte Gaszuführkanäle aufweist, welche mittels eines aus zwei Steuerringen gebildeten Leitringes in einem die Turbinenschaufel umgebenden Führungszylinder, in zwei unterschiedliche Arbeitspositionen verschiebbar ist und die Turbinenleiteinrichtung aus dem Leitring mit den zwei Steuerringen besteht, zwischen denen Gaszuführkanäle verschiedenen Querschnitts über eine trennende Zwischenwand gebildet sind.The invention relates to a radial turbine for a turbocharger of a supercharged internal combustion engine with an adjustable turbine guide that at least two separate gas supply channels which, by means of one of two control rings formed guide ring in a turbine blade surrounding guide cylinder, in two different Working positions is displaceable and the turbine guide from the guide ring with the two control rings exists, between which gas supply channels are different Cross-section over a dividing partition are formed.

Aus der DE 42 15 301 A1 ist ein Abgasturbolader mit einer Radialturbine bekannt, bei der zur Änderung eines wirksamen Querschnitts des Leitapparates für den zugeführten Abgasstrom ein verstellbarer Steuerring angeordnet ist. Dieser umfaßt zwei Zuführkanäle mit unterschiedlichen Querschnitten, die für Vollast und Teillast ausgelegt sind, wobei jeweils ein Zuführkanal eingeschaltet ist, um einen entsprechend wirksamen Querschnitt zu ergeben.An exhaust gas turbocharger is known from DE 42 15 301 A1 a radial turbine known to change one effective cross section of the guide for the supplied Exhaust gas flow arranged an adjustable control ring is. This comprises two feed channels with different ones Cross sections for full load and part load are designed, with one feed channel switched on is to a correspondingly effective cross section to surrender.

Der Erfindung liegt die Aufgabe zugrunde, für eine gattungsgemäße Anordnung mit einer Turbinenleiteinrichtung eine einfache Verstellung der Steuerringe mit einer Selbsthaltung zu ermöglichen. The invention is based, for one Generic arrangement with a turbine guide a simple adjustment of the control rings with to enable self-retention.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Anspruches 1 gelöst. Weitere vorteilhafte Ausgestaltungen sind durch die Merkmale der Unteransprüche gekennzeichnet.This object is achieved by the features of claim 1 solved. Further advantageous configurations are characterized by the features of the subclaims featured.

Die mit der Erfindung hauptsächlich erzielten Vorteile bestehen darin, daß ein verstellbarer Leitring mit zwei Gasführungskanälen für Voll- und Teillast der Turbinenleiteinrichtung mittels eines Druckluftspeichers und elektrisch ansteuerbaren Magnetventilen in eine Stellung für hohen Ladedruck und damit starkem Drehmoment und in eine weitere Stellung für einen optimalen, zünddruckgerechten und verbrauchsoptimierten Vollastbetrieb verstellbar ist.The main advantages achieved with the invention consist of an adjustable guide ring with two Gas routing channels for full and partial load of the turbine guide by means of a compressed air reservoir and electrically controllable solenoid valves in one Position for high boost pressure and therefore strong torque and in another position for an optimal, ignition pressure and consumption optimized Full load operation is adjustable.

Durch eine entsprechende konstruktive Ausbildung mittels einer die Gasführungskanäle trennenden Zwischenwand, kann der Leitring nach Abschluß eines Verstellvorganges in stabiler Selbsthaltung in seiner eingenommenen Stellung verbleiben. Nach einem Erreichen der gewünschten Position bleibt der Leitring somit in Selbsthaltung und zudem wird dieser Zustand noch durch die von der Brennkraftmaschine entwickelten Drücke luft- und abgasseitig unterstützt. Die vergrößerte Fläche der Zwischenwand auf die der Abgasdruck steht und durch die unterschiedliche Drosselung der Ringkanäle durch eine einseitige Abdichtung ergibt sich eine resultierende Haltekraft, die den Leitring sicher in der von der Steuerung zugewiesenen Position hält.Through appropriate constructive training by means of a separating the gas guide channels Partition, the guide ring can be completed after a Adjustment process in stable self-retention in its occupied position remain. After reaching the guide ring remains in the desired position Self-retention and also this condition is still through the pressures developed by the internal combustion engine Supported on the air and exhaust side. The enlarged Area of the intermediate wall on which the exhaust gas pressure is and due to the different throttling of the ring channels due to a one-sided seal a resulting holding force that secures the guide ring stops in the position assigned by the controller.

Der Leitring umfaßt im wesentlichen zwei Steuerringe, welche mit dem Turbinengehäuse jeweils einen Ringkanal abschließen. Diese Ringkanäle sind mit dem Druckluftspeicher und einem Ladedruckaufnehmer verbunden. The guide ring essentially comprises two control rings, which with the turbine housing each have an annular channel to lock. These ring channels are with the compressed air reservoir and a boost pressure sensor connected.

Die die Gasführungskanäle des Leitringes trennende Zwischenwand, ist jeweils in den zwei möglichen Stellungen in einer Wandung des Turbinengehäuses in einem Sitz gehalten, der jeweils einen bündigen Gasführungskanal ergibt.The separating the gas guide channels of the guide ring Partition wall is in the two possible Positions in a wall of the turbine housing in held a seat, each with a flush gas duct results.

Für den Anfahrvorgang sowie für den Leerlauf dient eine mechanische Sperre, bestehend aus einem Haltestift, welcher pneumatisch angesteuert wird und dafür sorgt, daß der Leitring nicht durch Vibrationen der Brennkraftmaschine unkontrolliert aus einer eingestellten Position wandert.A is used for the starting process and for idling mechanical lock, consisting of a holding pin, which is pneumatically controlled and ensures that the guide ring is not caused by vibrations of the internal combustion engine uncontrolled from a set Position moves.

Die Position des Leitringes wird vorzugsweise mittels einer speicherorientierten Steuerung, durch eine Steuereinrichtung über Magnetventile in Abhängigkeit von Parametern der Brennkraftmaschine eingestellt. Diese Parameter können beispielsweise die Drehzahl der Brennkraftmaschine, die Drehzahl der Abgasturbine, der Druck im Ladeluftaufnehmer oder der Kraftstoffeinspritzpumpe sein, wobei auch eine Kombination dieser Parameter möglich ist.The position of the guide ring is preferably by means of a memory-oriented control, by a Control device via solenoid valves depending set by parameters of the internal combustion engine. These parameters can, for example, the speed of the Internal combustion engine, the speed of the exhaust gas turbine, the Pressure in the charge air pickup or the fuel injection pump be a combination of these Parameter is possible.

Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen schematisch dargestellt und wird im folgenden näher beschrieben.An embodiment of the invention is in the drawings is shown schematically and is shown below described in more detail.

Es zeigen:

Fig. 1
einen Längsschnitt durch einen Abgasturbolader mit einer Radialturbine und mit einem verstellbaren Leitring,
Fig. 2
einen vergrößerten Ausschnitt der Turbine mit dem verstellbaren Leitring und
Fig. 3
eine Steuerung mit Magnetventilen und Luftleitungen.
Show it:
Fig. 1
2 shows a longitudinal section through an exhaust gas turbocharger with a radial turbine and with an adjustable guide ring,
Fig. 2
an enlarged section of the turbine with the adjustable guide ring and
Fig. 3
a control with solenoid valves and air lines.

Ein Abgasturbolader 1 für eine Brennkraftmaschine 13 umfaßt im wesentlichen einen Verdichter 3 mit einer Abgasturbine 2. Über eine Steuerungseinrichtung 18 ist der Abgasturbine 2 durch einen Ladedruckaufnehmer 14 und einem Druckluftspeicher 8 Druckluft in Abhängigkeit vom Lastzustand der Brennkraftmaschine zuführbar.An exhaust gas turbocharger 1 for an internal combustion engine 13 essentially comprises a compressor 3 with a Exhaust gas turbine 2. Via a control device 18 the exhaust gas turbine 2 by a boost pressure sensor 14 and a compressed air reservoir 8 depending on compressed air can be fed from the load state of the internal combustion engine.

In der Abgasturbine 2 ist eine Turbinenleiteinrichtung 4 mit einem Leitring L, bestehend aus zwei Steuerringen Sl und S2 mit gebildeten Gasführungskanälen 11,12, unterschiedlichen Querschnitts angeordnet.A turbine guide device is located in the exhaust gas turbine 2 4 with a guide ring L, consisting of two control rings Sl and S2 with gas routing channels 11, 12, arranged different cross-section.

Der Leitring L kann in zwei Stellungen T und V verschoben werden, wobei die T-Stellung für einen hohen Ladedruck steht und ein starkes Drehmoment am Abtriebsflansch der Brennkraftmaschine 13 erlaubt. Dagegen steht die V-Stellung für einen optimalen, zünddruckgerechten und verbrauchsoptimierten Vollastbetrieb.The guide ring L can be moved to two positions T and V. be, the T position for a high Boost pressure is there and a strong torque on the output flange the internal combustion engine 13 allowed. On the other hand the V-position stands for an optimal ignition pressure-compatible and consumption-optimized full-load operation.

Die Turbinenleiteinrichtung 4 kann mittels des Druckluftspeichers 8 und elektrisch ansteuerbaren Magnetventilen 9 in der Steuerungseinrichtung 18 in die beiden Positionen T und V verstellt werden. Aufgrund konstruktiver Maßnahmen an der Leiteinrichtung 4 kann der Leitring L in der gewünschten Stellung in der Selbsthaltung verbleiben, ohne ständige Zuführung von Druckluft aus einem externen Speicher.The turbine guide 4 can by means of the compressed air reservoir 8 and electrically controllable solenoid valves 9 in the control device 18 in the both positions T and V can be adjusted. Because of constructive measures on the control device 4 can the guide ring L in the desired position in the Self-retention remain without constant supply of Compressed air from an external storage.

Hierzu besteht auf der Turbinengehäuseseite 7 eine direkte Verbindung über eine Leitung 6 zum Ladeluftaufnehmer 14 der Brennkraftmaschine 13. Über einen Ringkanal 5a wirkt der Ladeluftdruck ständig auf den Leitring L. Auf der Lagerträgerseite 21 besteht eine Verbindung über eine Leitung 6a zwischen dem Ringkanal 5b und dem Ladeluftaufnehmer 14 nur über die Steuerungseinrichtung 18. In den Ringkanal 5a des Steuerringes S2 kann wahlweise Druckluft aus dem externen Druckluftspeicher 8, Ladeluft aus dem Ladeluftaufnehmer 14 oder durch Entlüftung der Druck entsprechend verändert werden. Auf dieser Seite erfolgt dann auch die Ein leitung des Schaltvorganges.For this there is a on the turbine housing side 7 direct connection via a line 6 to the charge air pickup 14 of the internal combustion engine 13. Via an annular channel 5a, the charge air pressure constantly acts on the guide ring L. There is one on the bearing bracket side 21 Connection via a line 6a between the ring channel 5b and the charge air pickup 14 only via the Control device 18. In the ring channel 5a of the Control ring S2 can choose compressed air from the external compressed air reservoir 8, charge air from the charge air receiver 14 or by venting the pressure be changed accordingly. This is done on this page then the one line of the switching process.

Ausgehend vom Start der Brennkraftmaschine 13, wird über einen Druckimpuls aus dem externen Druckluftspeicher 8 in den Ringkanal 5a des Steuerringes S1 der Leitring L in die Position T geschoben. Gleichzeitig wird mittels eines Pneumatikzylinders 20 eine mechanische Sperre, bestehend aus einem Haltestift 19, betätigt und die Position T verriegelt. Dadurch kann die Luftzufuhr aus dem Speicher 8 unterbrochen werden, da sich im anderen Fall ein hoher Luftverbrauch einstellen würde. Bei einer steigenden Leistung der Brennkraftmaschine 13 steigt auch der Druck im Ladeluftaufnehmer 14.Starting from the start of the internal combustion engine 13, via a pressure pulse from the external compressed air reservoir 8 in the ring channel 5a of the control ring S1 Guide ring L pushed into position T. At the same time is a mechanical by means of a pneumatic cylinder 20 Lock, consisting of a retaining pin 19, operated and locked position T. This allows the Air supply from the memory 8 are interrupted because otherwise high air consumption will occur would. With increasing performance of the internal combustion engine 13, the pressure in the charge air pickup also increases 14.

Der Ladedruck erzeugt in den Ringkanälen 5a oder 5b der Steuerringe S1 oder S2 die Kraft für die Selbsthaltung der Turbinenleiteinrichtung 4. Die sichere Selbsthaltung wird insbesondere dadurch ereicht, daß der Ringkanal 5b mittels kolbenringartiger Dichtungselemente 16 gegenüber dem turbinenseitigen Gaszuführkanal 12 stärker abgedichtet wird als auf der anderen Seite im Ringkanal 5a.The boost pressure generated in the ring channels 5a or 5b Control rings S1 or S2 the force for self-holding of the turbine guide device 4. Safe self-retention is achieved in particular by the fact that the Ring channel 5b by means of piston-ring-like sealing elements 16 opposite the turbine-side gas supply duct 12 is sealed more than on the other side in the ring channel 5a.

Diese unterschiedliche Drosselung ergibt im Ringkanal 5b einen höheren Druck, der den Leitring L in der Position T hält. Eine weitere Verstärkung der Haltekraft wird durch eine vergrößerte Fläche einer Zwischenwand 17 des Leitringes L erreicht, auf die der Abgasdruck im Zuströmkanal 12 der Turbine 2 drückt. Die Zwischenwand 17 ist in einem Sitz gelagert, der aus einer Ringausnehmung 32 und 33 in den Wänden 30,31 des Turbinengehäuses 7 besteht.This different throttling results in the ring channel 5b a higher pressure, which the guide ring L in the Position T holds. A further strengthening of the holding force is represented by an enlarged area of a Partition wall 17 of the guide ring L is reached, on which the Exhaust gas pressure in the inflow channel 12 of the turbine 2 presses. The intermediate wall 17 is mounted in a seat made of a ring recess 32 and 33 in the walls 30,31 of Turbine housing 7 is made.

Diese reduzierte Drosselung des Luftstromes im Ringkanal 5a führt zu einem thermischen Ausgleich der Leiteinrichtung 4, da die kühle Ladeluft den turbinenseitig heißeren Teil stärker kühlt. Dadurch entsteht kein thermischer Verzug, der zum Klemmen des Schiebesitzes im Führungszylinder F das Leitringes L führen könnte. Der Luftstrom dient gleichzeitig als Sperrluft gegen das Eindringen von Abgas in die Ringkanäle 5a und 5b und dient auch zur Vermeidung von Ablagerungen im Schiebespalt.This reduced throttling of the air flow in the ring duct 5a leads to thermal compensation of the guide device 4, because the cool charge air the turbine side hotter part cools more. This does not result in any thermal distortion, which is used to clamp the sliding seat could guide the guide ring L in the guide cylinder F. The air flow also serves as sealing air against the penetration of exhaust gas into the ring channels 5a and 5b and also serves to avoid deposits in the Sliding gap.

Durch diese beiden Maßnahmen ergibt sich eine außerordentlich hohe Funktionssicherheit, auch beim Betrieb mit Rückstandskraftstoffen.These two measures result in an extraordinary one high functional reliability, also during operation with residual fuels.

Bei weiter zunehmender Leistung werden die Schaltkriterien 15 überfahren, die im Speicher 10 der Steuerung abgelegt sind. Dieses können sein: Drehzahl der Aufladeeinrichtung 1, Drehzahl der Brennkraftmaschine 13, unzulässiger Ladedruck oder die eingespritzte Kraftstoffmenge oder eine Kombination dieser Größen.With further increasing performance the switching criteria 15 run over in the memory 10 of the controller are filed. These can be: speed of the Charging device 1, speed of the internal combustion engine 13, impermissible boost pressure or the injected Amount of fuel or a combination of these sizes.

Durch das von den Schaltkriterien ausgelöste elektrische Schaltsignal wird der Ringkanal 5b über die Magnetventile 9 kurzzeitig entlüftet. Der anstehende Ladedruck im Ringkanal 5a drückt den Leitring L aus der Position T in die Position V. Aufgrund der veränderten wirksamen Leitringfläche im Gasführkanal 11 ändert sich der Ladedruck auf eine gewünschte Höhe. Due to the triggering of the switching criteria electrical switching signal is the ring channel 5b the solenoid valves 9 are briefly vented. The upcoming one Boost pressure in the ring channel 5a presses the guide ring L from position T to position V. Due to the modified effective guide ring surface in the gas duct 11 the boost pressure changes to a desired level.

Beim Rückschalten von der Position V in die Position T wird ein zeitlich eng begrenzter Druckimpuls aus dem höheren Druck des externen Speichers 8 in den Ringkanal 5b geleitet und verschiebt den Leitring L gegen den Ladedruck im Ringkanal 5a. Die Steuerung unterbricht nach Ablauf eines einstellbaren Zeitintervalls den Luftstrom aus dem Speicher 8 und schaltet zurück auf die Ladedruckverbindung in den Ringkanal 5b. Durch diese Ausgestaltung verbleibt der Leitring L stabil in der gewünschten Position.When switching back from position V to position T is a pressure pulse from the higher pressure of the external memory 8 in the ring channel 5b directed and shifts the guide ring L against the Boost pressure in the ring channel 5a. The control interrupts after an adjustable time interval Airflow from memory 8 and switches back on the boost pressure connection in the ring channel 5b. By this configuration, the guide ring L remains stable in the desired position.

Claims (6)

  1. Radial turbine for a turbocharger of a supercharged internal combustion engine having a displaceable turbine directing device, which comprises at least two separate gas supply channels, which by means of a directing ring formed by two control rings is displaceable in a guide cylinder surrounding the turbine blades into two different operating positions and the turbine directing device comprises the directing ring with the two control rings, between which gas supply channels of differing cross section are formed by means of a separating partition wall, characterized in that the partition wall (17) in terms of its frontal area is greater than the ring channel area of the guide cylinder (F), which receives the directing ring (L), in the turbine housing (7) and in the first control ring (S1) an annular seal (16) of the ring channel (5b) is disposed relative to the turbine housing (7) in such a way that enables a pressure difference to be produced relative to the further ring channel (5a) of the second control ring (S2).
  2. Radial turbine according to claim 1, characterized in that the ring channel (5b) of the control ring (S1) is connectable by a line (6a) to a compressed-air store (8) or a supercharger air receiver (14), wherein the further ring channel (5a) of the control ring (S2) is directly connected by a line (6) to the supercharger air receiver (14) of the internal combustion engine (13).
  3. Radial turbine according to claims 1 or 2,
    characterized in that the partition wall (17) in the directing ring (L) has a seat in each case in a recess (32 or 33) of the opposing walls (30, 31) of the turbine housing.
  4. Radial turbine according to claims 1, 2 or 3, characterized in that provided at the pressure-controlled side of the ring channel (5b) via a pneumatic cylinder (20) activated by the control device (10) is a mechanical latch comprising a retaining pin (19), which is arrestable for fixing the directing ring (L) in position.
  5. Radial turbine according to one or more of the preceding claims, characterized in that the position of the directing ring (L) is adjustable by means of a storage-oriented control of the device (18) via solenoid valves (9) in dependence upon parameters such as the rotational speed of the internal combustion engine (13), the rotational speed of the exhaust gas turbine (2), the pressure in the supercharger air receiver (14) or the fuel injection quantity, or a combination of said parameters.
  6. Method of effecting switching operations of the directing ring of the turbine directing device into the active and passive operating position according to claim 1, characterized by the following control operations:
    the prevailing supercharger pressure from the supercharger pressure receiver (14) is directed into the ring channel (5a) of the control ring (S2) and in the guide cylinder (F) displaces the directing ring (L) out of the operating position (V) into the operating position (T) with the effective gas supply channel (11), wherein the effective directing ring area in the gas supply channel (11) varies the supercharger pressure;
    upon a switch from the operating position (T) back into the operating position (U), a pressure pulse of limited duration is directed from the store (8) into the ring channel (5b) of the control ring (S1) ;
    the directing ring (L) is displaced in the guide cylinder (F) counter to the supercharger pressure introduced into the ring channel from the supercharger pressure receiver (14) and the exhaust gas flow flows through the gas supply channel (12).
EP97106344A 1996-06-13 1997-04-17 Radial turbine for a turbocharger Expired - Lifetime EP0814235B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19623558 1996-06-13
DE19623558A DE19623558C1 (en) 1996-06-13 1996-06-13 Radial turbine for turbocharger on internal combustion engine

Publications (2)

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EP0814235A1 EP0814235A1 (en) 1997-12-29
EP0814235B1 true EP0814235B1 (en) 2000-03-01

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EP97106344A Expired - Lifetime EP0814235B1 (en) 1996-06-13 1997-04-17 Radial turbine for a turbocharger

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DE19623558C1 (en) * 1996-06-13 1997-04-10 Mak Maschinenbau Krupp Radial turbine for turbocharger on internal combustion engine

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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DE59701159D1 (en) 2000-04-06
EP0814235A1 (en) 1997-12-29
DE19623558C1 (en) 1997-04-10

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