GB2319828A - A device for activating a turbine bypass valve - Google Patents
A device for activating a turbine bypass valve Download PDFInfo
- Publication number
- GB2319828A GB2319828A GB9724769A GB9724769A GB2319828A GB 2319828 A GB2319828 A GB 2319828A GB 9724769 A GB9724769 A GB 9724769A GB 9724769 A GB9724769 A GB 9724769A GB 2319828 A GB2319828 A GB 2319828A
- Authority
- GB
- United Kingdom
- Prior art keywords
- diaphragm
- pressure
- exhaust
- capsule
- rod
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- F02B37/183—Arrangements of bypass valves or actuators therefor
- F02B37/186—Arrangements of actuators or linkage for bypass valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/10—Characterised by the construction of the motor unit the motor being of diaphragm type
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Supercharger (AREA)
Abstract
A device for activating a exhaust-gas valve (15,Fig.1) opening a short-circuit line (13) to a downstream catalytic converter (12), with an exhaust-gas turbine (10) being bypassed. The device comprises a pressure capsule provided with a chamber 16 having a pressure connection 17, at least one diaphragm 26 or 27 which acts on a regulating rod 28 for the valve (15), and a spring 35 preloading the diaphragm 27. A second diaphragm 26 is provided in the capsule. The chamber 16 is closed off on opposite sides in each case by a diaphragm and at the circumference by the casing of the capsule. The diaphragms 26, 27 have different diameters, the larger diaphragm being connected directly or via intermediate elements to a push rod 28 and the smaller diaphragm 27 being connected directly or via intermediate elements to the regulating rod 28. The larger diaphragm 26 is pressed onto the smaller diaphragm 27 via the push rod 38 when there is a vacuum in the chamber 16, and the smaller diaphragm 27 is pressed onto the regulating rod 28 when there is a positive pressure in the chamber 16.
Description
1 Device for activating an exhaust-gas valve in turbocharged engines
2319828 The invention relates to a device for activating an exhaust-gas valve in turbocharged engines, the exhaust-gas valve, in the open position, opening a short-circuit line to a downstream catalytic converter, to thereby by-pass an exhaust-gas turbine.
In general, it is known in the case of exhaust-gas turbochargers to bypass the exhaust-gas turbine by a short-circuit line, also called waste- gate duct, in order to allow the exhaust-gas flow or at least some of it to by-pass the turbine. The flow through the short-circuit line is controlled by an exhaust-gas valve as a function of the pressure in a pressure capsule. The main purpose of the short-circuit line is to provide a bypass for the exhaust-gas turbine in the event of a high pressure in order to avoid damage.
DE 39 35 093 C2 discloses a device for controlling the exhaust-gas return quantity on an internal-combustion engine, an exhaust-gas return line branching off from an exhaust-gas line to an inlet line. To this end, the exhaust-gas return valve has a pneumatic control drive, the adjustment being effected as a function of the admission of pressure to the valve. In the case of the previously known device, disturbing effects in the intake line and the exhaust-gas line are to be eliminated. To this end, appropriate regulation is effected in different regulating directions or in regulating directions opposed to one another.
No control of the exhaust-gas return quantity is to be carried out by the exhaust-gas valve mentioned at the beginning, but bypassing of the exhaust-gas turbine is to be achieved by this valve.
However, in addition to bypassing the exhaust-gas turbine at an excessive pressure, bypassing the exhaust-gas turbine during cold-start operation would also be of advantage in order to bring the catalytic converter to operating temperature as quickly as possible. If the exhaust-gas turbine is bypassed, the exhaust gas can reach the catalytic converter at a higher temperature. At this instant, however, there is not a positive pressure in the intake system but, as a rule, a vacuum, so that the known exhaust-gas valve is not suitable for opening the short-circuit line. To solve this 2 problem, a further short-circuit line, which is opened by a separate valve during cold-start operation, could be provided. However, this would mean a correspondingly high cost.
The present invention seeks to provide a device in which a single shortcircuit line for bypassing an exhaust-gas turbine can be opened during both a positive pressure and a vacuum in the engine intake.
According to the present invention there is provided a device for activating an exhaust-gas valve in turbocharged engines, the exhaust-gas valve, in the open position, opening a short-circuit line to a downstream catalytic converter, to thereby by-pass an exhaust-gas turbine, the device including a pressure capsule which is provided with a pressure chamber having a pressure connection, at least one diaphragm which acts on a regulating rod for the exhaust-gas valve, and a spring preloading the diaphragm, the device further including a second diaphragm in the pressure capsule, the pressure chamber being closed off on opposite sides in each case by one of said diaphragms and at the circumference by the casing of the pressure capsule, the two diaphragms having different diameters, the larger diaphragm being connected directly or via intermediate elements to a push rod and the smaller diaphragm being connected directly or via intermediate elements to the regulating rod, and the larger diaphragm being pressed onto the smaller diaphragm via the push rod when there is a vacuum in the pressure chamber, and the smaller diaphragm being pressed onto the regulating rod when there is a positive pressure in the pressure chamber.
According to the invention, the pressure capsule, which is provided with a second diaphragm, now provides a common regulating function, specifically in the same regulating direction, when both a positive- pressure and a vacuum occur. In this case, only one pressure feed line and also only one pressure chamber are provided, a regulating movement always being carried out in the same direction for opening the exhaust- gas valve, irrespective of whether a positive pressure or a vacuum prevails in the pressure chamber.
An embodiment of the invention will now be described below with reference to the drawing, in which:
Fig. 1 shows the overall representation of the device according to the invention 3 1 together with air and exhaust-gas system of the internal-combustion engine, and Fig. 2 shows the pressure capsule according to the invention in section.
lle device, the construction of which is explained below, is installed in an arrangement (shown in Fig. 1) for controlling fresh air to an engine 1 for the exhaust-gas discharge and exhaust-gas return, the complete device in principle being of known type of construction, for which reason only the parts essential for the invention are dealt with in more detail below.
The essential parts for operating the engine 1 with regard to fresh-air feed and exhaust-gas discharge include a fresh-air line 2 in which a compressor 3 and a charge-air cooler 4 are located. The fresh air is fed to an intake manifold 5 via the compressor 3, unless a bypass is intended in a controlled manner via a control line 7 having a 2/2-way directional valve 25 and a circulating-air slide valve 6. Fresh air passes from the intake manifold 5 via an engine feed line 8 to the engine 1. An exhaustgas line 9 leads from the engine 1 or the piston spaces of the englie to an exhaust-gas turbine 10, which is arranged upstream of a catalytic converter 12 arranged in an exhaust-gas pipe 11. The turbine 10, which is arranged in the exhaust-gas system between the exhaust-gas line 9 and the exhaust-gas pipe 11, can be bypassed by a short-circuit line 13. An exhaust-gas valve 14 opens or closes the short-circuit line 13. The exhaust-gas valve 14 is activated by a device 15 in the form of a pressure capsule. The pressure capsule 15 has a pressure chamber 16, which is connected to a charge-pressure regulating line 17, which is connected to the fresh-air line 2 via a 3/3-way directional valve 18 and a branch line 19. A vacuum-activating line 17a branches off from the charge-pressure regulating line 17. Located in the vacuum-activating line 17a are a 2/2-way directional valve 20 and a non-return valve 21. The vacuum-activating line 17a leads in turn into the intake manifold 5. The 212-way directional valve 20 is controlled via a control line 22 from an engine electronic control unit 23. Likewise, the 313-way directional valve 18 in the charge-pressure regulating line 17 is activated via a control line 24. In addition, there is a 2/2-way directional valve 25 in the control line 7. The 212-way directional valve 25 is likewise activated from the engine electronic control unit 23.
The pressure chamber 16 is closed off at the circumference by the casing of the pressure capsule 15 and at both end faces by a vacuum diaphragm 26 and a 4 positive-pressure diaphragm 27. A regulating rod 28 produces the connection to the exhaust-gas valve 14.
The precise construction of the pressure capsule 15 can be seen more clearly from Fig. 2. The circumferential wall of the pressure capsule 15 has a frustoconical shape, the vacuum diaphragm 26 being arranged as a closure of the pressure chamber 16 in the region of the larger diameter and the positive-pressure diaphragm 27 being arranged as a closure of the pressure chamber 16 in the region of the smaller diameter. The diaphragms, which are thus of different size, provide a pressure-tight closure of the pressure chamber 16. On the side of larger diameter, the pressure capsule 15 has a cover 29 having a stop 30, for limiting the displacement of the larger vacuum diaphragm 26, and an opening 3 1. The opening 31 may lead into the open or be connected to a control-pressure line 32. In this way, a compensating space 33 is created between the cover 29 and the vacuum diaphragm 26.
A diaphragm spring plate 34 for supporting the smaller positive-pressure diaphragm 27 is located on the side of the latter remote from the pressure chamber 16, on the rear side of which diaphragm spring plate 34 a spring for spring-pressure preloading is also supported at the same time. On the side remote from the diaphragm spring plate 34, the spring 35 is supported on a casing part which in the exemplary embodiment is formed by an adjusting nut 36. The adjusting nut 36 is connected to the casing of the pressure capsule 15 via a threaded connection. The spring preloading of the spring 35 can be adjusted or readjusted by the threaded connection.
The diaphragm spring plate 34 and the positive-pressure diaphragm 27 are supported on a stop 37 in the casing wall in the region of their outer circumference. At the same time, the vacuum diaphragm 26 is fixed in this location at the circumference.
Firmly connected to the vacuum diaphragm 26 is a push rod 38, which extends through the pressure chamber 16 right up to the positive-pressure diaphragm 27. The push rod 38 is guided in an axially displaceable manner in a push-rod guide sleeve 39. The push-rod guide sleeve 39 in turn is firmly connected to the positive-pressure diaphragm 27.
The device according to the invention functions in the following way:
When the pressure chamber 16 is pressurized from the charge-pressure wt-regulating line 17 with a minimum positive pressure, the positivepressure diaphragm 27 with the push-rod guide sleeve 39 fastened thereto is deflected against the restoring force of the spring 35 in regulating direction, i.e. in arrow direction 40, whereby the exhaust-gas valve 14 opens and thus opens the short-circuit line 13 for bypassing the exhaustgas turbine 10. In the process, the push-rod guide sleeve 39 is lifted out of its stop position relative to the push rod 38. The vacuum diaphragm 26, with the push rod 38 fastened to it, bears with a reinforcing portion 42 against the stop 30 and is therefore not deflected. This means that it is not active when there is a positive pressure in the pressure chamber 16.
The relation between admission of positive pressure to the pressure chamber 16 and the regulating displacement of the regulating rod 28 or the regulating force can be changed by appropriate matching of the surface area of the positivepressure diaphragm 27 and the spring force. To this end, the adjusting nut 36 can also be adjusted accordingly in its position.
If vacuum is introduced into the pressure chamber 16, e.g. during coldstart operation, in which the 2/2-way directional valve 20 opens the passage through the vacuum-activating line 17a and the 313-way directional valve 18 is closed on both sides, an equally large ambient pressure acts on the diaphragm surfaces, of different size, of the vacuum diaphragm 26 and the positive-pressure diaphragm 27, the reason for this being that not only is the compensating space 33 connected to the ambient for this purpose, via the opening 3 1, but so too is a spring space 4 1, by a corresponding gap in the adjusting nut 36. Both diaphragms arch inwards. The push rod 38 and the push-rod guide sleeve 39 are thus pressed against the stop. As a result of the larger diaphragm surface of the vacuum diaphragm 26, however, a resulting regulating force is obtained in arrow direction 40 against the force of the spring 35. If the regulating force exceeds the spring force after a minimum pressure difference between ambient pressure and the vacuum in the pressure chamber 16 is reached, the spring 35 is compressed and the regulating rod 28 is displaced in the regulating direction 40. Thus the regulating direction is the same as when positive pressure occurs. This means that the exhaust-gas valve 14 also opens when a vacuum occurs and thus results in the exhaust-gas turbine 10 being bypassed in order to heat up the catalytic converter 12 more quickly during start-up operation.
6 Instead of an exhaust-gas flow completely bypassing the exhaust-gas turbine 10 via the short-circuit line 13, partial flows may of course also be provided.
During pressure regulation of the pressure capsule 15 with positive pressure, the valve 18 operates in timed sequence between passage and ambient, while the valve 20 is closed.
The diaphragm spring plate 34 has a double function; namely, it serves as a supporting or bearing surface for the positive-pressure diaphragm 27 on the one hand and as a bearing surface for the spring 35 on the other hand. If the compensating space 33 is not connected to the ambient pressure via the opening 31 but to a control-pressure line 32, the exhaust-gas valve 14 may also be regulated in another way or other pressure ratios for opening the exhaust-gas valve 14 can be set.
7
Claims (10)
1. 1: a second diaphragm in the pressure capsule, 1.2: the pressure chamber being closed off on opposite sides in each case by one of said diaphragms and at the circumference by the casing of the pressure capsule, 1.1 the two diaphragms having different diameters, the larger diaphragm being connected directly or via intermediate elements to a push rod and the smaller diaphragm being connected directly or via intermediate elements to the regulating rod, and the larger diaphragm being pressed onto the smaller diaphragm via the push rod when there is a vacuum in the pressure chamber, and the smaller diaphragm being pressed onto the regulating rod when there is a positive pressure in the pressure chamber.
2. A device according to Claim 1, wherein the smaller diaphragm is provided with a push-rod guide sleeve on the side directed towards the larger diaphragm, and the push rod is guided in said push-rod guide sleeve.
3. A device according to Claim 1 or 2, wherein the regulating rod has a diaphragm spring plate, against which the smaller diaphragm bears, the spring being loaded between the diaphragm spring plate and a casing part of the pressure capsule remote from the diaphragm spring plate.
4. A device according to Claim 3, wherein the casing part is formed by an adjusting nut for the preadjustment of the spring pressure.
8
5.
bears against a casing stop.
A device according to Claim 3 or 4, wherein the diaphragm spring plate
6. A device according to Claims 1 to 5, wherein the pressure capsule has a pressure-compensating space on the side of the larger diaphragm remote from the pressure chamber, which pressure-compensating space is provided with an outlet opening.
7. i A device according to Claim 6, wherein a stop for the larger diaphragm s arranged in the pressure-compensating space.
8. A device according to Claim 6 or 7, wherein the ambient pressure is admitted to the outlet opening.
9. A device according to Claim 6 or 7, wherein the outlet opening is connected to a pressure-control line.
10. A device for activating an exhaust-gas valve in turbocharged engines, substantially as described herein with reference to, and as illustrated in, the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19649152A DE19649152C1 (en) | 1996-11-27 | 1996-11-27 | Device for controlling an exhaust valve in turbo engines |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9724769D0 GB9724769D0 (en) | 1998-01-21 |
| GB2319828A true GB2319828A (en) | 1998-06-03 |
| GB2319828B GB2319828B (en) | 1998-12-02 |
Family
ID=7812933
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9724769A Expired - Fee Related GB2319828B (en) | 1996-11-27 | 1997-11-24 | Device for activating an exhaust-gas valve in turbocharged engines |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE19649152C1 (en) |
| FR (1) | FR2756322B1 (en) |
| GB (1) | GB2319828B (en) |
| IT (1) | IT1297077B1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19833148A1 (en) * | 1998-07-23 | 2000-01-27 | Daimler Chrysler Ag | Procedure for functional testing of adjusting element subject to pressure in IC engine which opens and closes bypass channel bridging across turbine of exhaust turbocharger |
| FR2782746A1 (en) * | 1998-09-01 | 2000-03-03 | Renault | DEVICE FOR CONTROLLING A DISCHARGE VALVE |
| US6662708B2 (en) | 2002-03-04 | 2003-12-16 | Honeywell International Inc. | Pneumatic actuator canister |
| US20150059338A1 (en) * | 2013-08-29 | 2015-03-05 | Ford Global Technologies, Llc | Determination of wastegate valve position |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007023559B3 (en) | 2007-05-21 | 2008-12-04 | Continental Automotive Gmbh | Diagnostic method and device for diagnosing an intake tract of an internal combustion engine |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1377873A (en) * | 1971-03-09 | 1974-12-18 | Crouzet Sa | Fluid logic relays |
| GB1532516A (en) * | 1975-03-31 | 1978-11-15 | Garrett Corp | Turbocharger control systems |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS529719A (en) * | 1975-07-15 | 1977-01-25 | Toyota Motor Corp | Exhast gas recycling device |
| FR2483515A1 (en) * | 1980-05-27 | 1981-12-04 | Renault | IC-engine with turbocharger - has exhaust passing to catalytic reactor by passing turbocharger during cold running |
| JPS60198334A (en) * | 1984-03-21 | 1985-10-07 | Nissan Motor Co Ltd | Discharge controller for internal-combustion engine associated with supercharger |
| DE3935093A1 (en) * | 1989-10-21 | 1991-04-25 | Daimler Benz Ag | EXHAUST GAS RECIRCULATION DEVICE FOR A COMBUSTION ENGINE |
-
1996
- 1996-11-27 DE DE19649152A patent/DE19649152C1/en not_active Expired - Fee Related
-
1997
- 1997-11-24 GB GB9724769A patent/GB2319828B/en not_active Expired - Fee Related
- 1997-11-24 IT IT97RM000728A patent/IT1297077B1/en active IP Right Grant
- 1997-11-25 FR FR9714776A patent/FR2756322B1/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1377873A (en) * | 1971-03-09 | 1974-12-18 | Crouzet Sa | Fluid logic relays |
| GB1532516A (en) * | 1975-03-31 | 1978-11-15 | Garrett Corp | Turbocharger control systems |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19833148A1 (en) * | 1998-07-23 | 2000-01-27 | Daimler Chrysler Ag | Procedure for functional testing of adjusting element subject to pressure in IC engine which opens and closes bypass channel bridging across turbine of exhaust turbocharger |
| US6272860B1 (en) | 1998-07-23 | 2001-08-14 | Daimlerchrysler Ag | Method and apparatus for checking the functioning of a pressure-operated actuating element in an internal combustion engine |
| DE19833148B4 (en) * | 1998-07-23 | 2005-09-08 | Daimlerchrysler Ag | Method and device for functional testing of a pressurized actuator in an internal combustion engine |
| FR2782746A1 (en) * | 1998-09-01 | 2000-03-03 | Renault | DEVICE FOR CONTROLLING A DISCHARGE VALVE |
| WO2000012883A1 (en) * | 1998-09-01 | 2000-03-09 | Renault | Unloading valve control device |
| US6662708B2 (en) | 2002-03-04 | 2003-12-16 | Honeywell International Inc. | Pneumatic actuator canister |
| US20150059338A1 (en) * | 2013-08-29 | 2015-03-05 | Ford Global Technologies, Llc | Determination of wastegate valve position |
| US9316147B2 (en) * | 2013-08-29 | 2016-04-19 | Ford Global Technologies, Llc | Determination of wastegate valve position |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19649152C1 (en) | 1998-07-02 |
| GB2319828B (en) | 1998-12-02 |
| FR2756322B1 (en) | 2000-09-29 |
| IT1297077B1 (en) | 1999-08-03 |
| FR2756322A1 (en) | 1998-05-29 |
| ITRM970728A0 (en) | 1997-11-24 |
| ITRM970728A1 (en) | 1999-05-24 |
| GB9724769D0 (en) | 1998-01-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20061124 |