EP0874135B1 - Brennkraftmaschine und Betriebsverfahren - Google Patents
Brennkraftmaschine und Betriebsverfahren Download PDFInfo
- Publication number
- EP0874135B1 EP0874135B1 EP98105362A EP98105362A EP0874135B1 EP 0874135 B1 EP0874135 B1 EP 0874135B1 EP 98105362 A EP98105362 A EP 98105362A EP 98105362 A EP98105362 A EP 98105362A EP 0874135 B1 EP0874135 B1 EP 0874135B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valves
- gas
- internal combustion
- closed
- combustion engine
- 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.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/04—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation using engine as brake
Definitions
- the invention relates to a method for operating an internal combustion engine and an internal combustion engine for performing the Method according to the preamble of claim 1.
- each gas outlet valve is a limiting device assigned, which prevents the gas outlet valves close completely.
- the gas outlet valves are only closed so far that a braking effect is achieved.
- the limiting device and the throttle valve are through a brake pedal travel dependent adjustable directional control valve actuated.
- Deviating from DE 42 36 009 A1 a method known in which the air flow through the internal combustion engine depending on a determined driving condition and independent from a fuel flow rate is controllable to the To set the engine braking torque.
- overrun is with the Procedure for fuel cut a very low engine braking torque with a reached open throttle on the inlet side. Is a great engine braking torque is desired, the throttle and possibly an idle air bypass completely closed.
- the object of the invention is in an internal combustion engine of the type mentioned at the beginning, the emission values to improve and reduce the risk that an existing one Catalyst cools and loaded with harmful oxygen becomes.
- the invention is based on the recognition that fuel on walls of the inlet side passes and there a wall film forms. This degrades with an air flow, when the fuel supply is interrupted in overrun mode and passes with the air flow through the internal combustion engine in the exhaust system. This leads to an increased concentration unburned hydrocarbon, the environment loaded.
- Air flow is avoided by the internal combustion engine, by always at least the gas inlet or the gas outlet valves closed, no increased proportion of unburned Hydrocarbons in the environment. Furthermore, no fresh air gets into the catalyst, which cool this and with a could be laden with harmful levels of oxygen.
- FIG. 1 shows an internal combustion engine 1 with four cylinders 8, from an air manifold 17 via intake 18 and over Gas inlet valves 2 suck in a fuel air mixture and over Expel exhaust gas valves 3 and exhaust pipes 19 exhaust gases.
- the gas inlet 2 and gas outlet valves 3 of a cylinder 8 are common or preferred individually controllable by a control unit 11.
- Fig. 2 is a cylinder pressure curve 14 of a cylinder 8 and synchronous to a control timing 7 of the gas inlet valves. 2 and a Steuerzeitverlauf 6 of the gas outlet valves 3 over four Operating phases shown, with the phase IV substantially the phase I corresponds.
- Phase I concerns the normal Driving with an activated fuel injection and Ignition and has Zünddruckspitzen 15 in the cylinder. 8
- the controller 11 detects a fuel cut.
- a fuel cut-off from the control unit 11 as a function of the engine temperature of the internal combustion engine 1 measured by a temperature sensor 16 and activated.
- the gas inlet 2 and the gas outlet 3 are all Cylinder 8 immediately or after completion of a just running Intake or combustion process with the end of the Ausschiebevorgangs held in the closed position. simultaneously becomes with the shutdown of the gas inlet valves 2 the Fuel injection and the ignition interrupted. This is to recognize in the transition from phase I to phase II in Fig. 2.
- An increased engine braking torque and thus an effective engine braking operation may depend on different vehicle parameters be initiated and regulated, for example, depending on Speed, speed, inclination of the vehicle, etc.
- a load reduction gradient and / or a Brake signal 9 detected can be on the accelerator pedal 10, an injection system or otherwise a cheap Position on the internal combustion engine 1 are tapped.
- the Brake signal 9 can binary, away or pressure proportional to Brake pedal or detected at a convenient location in the brake system be, for example, on the brake light.
- the load reduction gradient and signals 9 from the brake system provide early exact values for controlling the engine braking torque.
- the described Parameters can be used individually or in combination be to initiate and regulate the engine braking torque.
- the engine braking torque is increased according to the invention by the Compression and / or the expansion work of the internal combustion engine 1 with the gas exchange valves 2, 3 converted into heat become.
- Fig. 2 in Transition from Phase II to Phase III is shown either the gas inlet 2 or preferably the gas outlet valves 3rd re-activated while the other genre of gas exchange valves 2, 3 remains closed.
- This is the opening process the gas outlet valves 3 of the respective cylinder 8 in the area initiated the top dead center.
- the Opening process shortly before reaching top dead center initiated so that the gas outlet valve 3 after a certain Delay in the area of maximum compression 4 opens.
- the opening process also in time in the area of top dead center be moved.
- the closing process is preferably shortly before reaching the bottom dead center initiated by a lower Compression 5 characterized. This ensures that the complete cylinder stroke volume at bottom dead center with exhaust gas is filled from the exhaust tract before the compression phase starts.
- the gas outlet valve opens 3 and the compression pressure 4 breaks down abruptly, so that the compression work is converted into heat and the engine braking power increases.
- this process runs every 360 ° crank angle, i. at each Crankshaft revolution, once off.
- the engine braking torque can be changed according to the invention, by the gas inlet 2 or the gas outlet valves 3 during single or multiple crankshaft revolutions of the internal combustion engine 1 and / or at one or more cylinders 8 all gas exchange valves 2, 3 remain closed.
- the controller 11 detects signals indicative of the end of a Engine brake operation speak, such as an interruption of the brake signal 9, an undershooting of the limit speed or a load request, the gas outlet valves 3 no longer closed at bottom dead center, but only in top dead center to harmful residual gas in the cylinder 8 for a postpone subsequent incineration. Subsequently can then cylinder selective gas inlet valves 2 with the Injection and ignition are activated to the combustion operation continue (Fig. 2 Phase III to IV).
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Description
Claims (9)
- Verfahren zum Betrieb einer Brennkraftmaschine (1) für Fahrzeuge, die mit einer Schubabschaltung arbeitet und eine variable Ventilsteuerung besitzt, bei der abhängig vom Fahrzustand des Fahrzeugs im Schubbetrieb ein Motorbremsmoment über Gaseinlass- (2) und Gasauslassventile (3) von einem Steuergerät (11) eingestellt wird, dadurch gekennzeichnet, dass zur Verbesserung der Emissionswerte sowie zur Minderung der Gefahr, dass ein vorhandener Katalysator auskühlt und mit schädlichem Sauerstoff beladen wird, im Schubbetrieb stets eine Ventilgattung, alle Gaseinlass- (2) oder alle Gasauslassventile (3), dauernd geschlossen ist, die einzeln oder gemeinsam von dem Steuergerät (11) angesteuert werden.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die andere Ventilgattung, entweder die Gaseinlass- (2) oder die Gasauslassventile (3) im Bereich eines oberen Totpunktes einer Kolbenbewegung geöffnet und im Bereich eines unteren Totpunktes wieder geschlossen werden, während die anderen Gaswechselventile (2, 3) geschlossen bleiben.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass eine Ventilgattung im Bereich des oberen Totpunktes und im Bereich des unteren Totpunktes der Kolbenbewegung kurz geöffnet und anschließend sofort wieder geschlossen wird.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass im Schubbetrieb bei einem oder mehreren Zylindern (8) alle Gaswechselventile (2, 3) geschlossen sind.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass beim Öffnen der Gaseinlass- (2) oder der Gasauslassventile (3) einzelne oder mehrere Umdrehungen übersprungen werden können.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Motorbremsmoment abhängig von einem Lastrücknahmegradienten geregelt ist.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Motorbremsmoment abhängig von einem Bremssignal (9) geregelt ist.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass Restgas bei einer erneuten Lastwiederaufnahme der Brennkraftmaschine (1) ausgeschoben wird.
- Brennkraftmaschine (1) zum Durchführen eines Verfahrens nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sie eine Schubabschaltung, eine variable Ventilsteuerung und ein Steuergerät (11) aufweist, das die Gaswechselventile (2, 3) einzeln oder gemunsam in Abhängigkeit von Verschiedenen Fahrzeugparametern derart ansteuert, dass in Schubbetrieb stets zumindest alle Gaseinlassventile (2) oder alle Gasauslassventile (3) geschlossen sind.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19717068 | 1997-04-23 | ||
DE19717068A DE19717068C1 (de) | 1997-04-23 | 1997-04-23 | Brennkraftmaschine |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0874135A2 EP0874135A2 (de) | 1998-10-28 |
EP0874135A3 EP0874135A3 (de) | 1999-05-12 |
EP0874135B1 true EP0874135B1 (de) | 2004-08-18 |
Family
ID=7827448
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98105362A Expired - Lifetime EP0874135B1 (de) | 1997-04-23 | 1998-03-25 | Brennkraftmaschine und Betriebsverfahren |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0874135B1 (de) |
DE (2) | DE19717068C1 (de) |
ES (1) | ES2226020T3 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9624868B2 (en) | 2012-09-07 | 2017-04-18 | Mazda Motor Corporation | Spark-ignition direct injection engine |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2795133B1 (fr) * | 1999-06-18 | 2002-07-12 | Renault | Procede de commande d'un moteur a combustion en vue de l'obtention d'un effet de frein moteur |
DE19963929A1 (de) * | 1999-12-31 | 2001-07-12 | Bosch Gmbh Robert | Verfahren zum Betreiben einer Brennkraftmaschine insbesondere eines Kraftfahrzeugs |
AT500601B1 (de) * | 2004-07-16 | 2006-11-15 | Avl List Gmbh | Verfahren zum betreiben einer brennkraftmaschine |
US7565896B1 (en) | 2008-02-28 | 2009-07-28 | Jacobs Vehicle Systems, Inc. | Method for variable valve actuation to provide positive power and engine braking |
DE102016216116A1 (de) | 2016-08-26 | 2018-03-01 | Bayerische Motoren Werke Aktiengesellschaft | Verfahren und Vorrichtung zum Betreiben eines Verbrennungsmotors im Schubbetrieb |
DE102017217712A1 (de) * | 2017-10-05 | 2019-04-11 | Ford Global Technologies, Llc | Verfahren und Anordnung zur Erhöhung der Abgastemperatur eines Verbrennungsmotors sowie Fahrzeug |
DE102018128038A1 (de) * | 2018-11-09 | 2020-05-14 | Bayerische Motoren Werke Aktiengesellschaft | Motorbremsbetrieb einer Brennkraftmaschine |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3428627A1 (de) * | 1984-08-03 | 1986-02-13 | Daimler-Benz Ag, 7000 Stuttgart | Viertakt-brennkraftmaschine |
DE3814484A1 (de) * | 1987-04-29 | 1988-11-17 | Erich Mai | Dieselmotoraggregat |
MX166451B (es) * | 1988-09-05 | 1993-01-11 | Echeverria Gregorio Jimenez | Sistema de freno de motor para todo tipo de motores diesel y gasolina |
DE4236009B4 (de) * | 1992-10-24 | 2007-08-02 | Robert Bosch Gmbh | Verfahren und Vorrichtung zum Steuern des Luftdurchsatzes durch einen Verbrennungsmotor im Schiebebetrieb |
US5379737A (en) * | 1993-08-26 | 1995-01-10 | Jacobs Brake Technology Corporation | Electrically controlled timing adjustment for compression release engine brakes |
DE19614923C2 (de) * | 1996-04-16 | 1999-05-06 | Daimler Benz Ag | Kraftfahrzeug mit einer Zusatzbremseinrichtung und Verfahren zum Notfall- Abbremsen eines derartigen Kraftfahrzeuges |
-
1997
- 1997-04-23 DE DE19717068A patent/DE19717068C1/de not_active Expired - Fee Related
-
1998
- 1998-03-25 EP EP98105362A patent/EP0874135B1/de not_active Expired - Lifetime
- 1998-03-25 DE DE59811815T patent/DE59811815D1/de not_active Expired - Lifetime
- 1998-03-25 ES ES98105362T patent/ES2226020T3/es not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9624868B2 (en) | 2012-09-07 | 2017-04-18 | Mazda Motor Corporation | Spark-ignition direct injection engine |
Also Published As
Publication number | Publication date |
---|---|
DE19717068C1 (de) | 1998-06-18 |
ES2226020T3 (es) | 2005-03-16 |
EP0874135A3 (de) | 1999-05-12 |
DE59811815D1 (de) | 2004-09-23 |
EP0874135A2 (de) | 1998-10-28 |
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