DE102022109301B3 - Method for supporting braking in a motor vehicle and corresponding motor vehicle - Google Patents
Method for supporting braking in a motor vehicle and corresponding motor vehicle Download PDFInfo
- Publication number
- DE102022109301B3 DE102022109301B3 DE102022109301.8A DE102022109301A DE102022109301B3 DE 102022109301 B3 DE102022109301 B3 DE 102022109301B3 DE 102022109301 A DE102022109301 A DE 102022109301A DE 102022109301 B3 DE102022109301 B3 DE 102022109301B3
- Authority
- DE
- Germany
- Prior art keywords
- spray nozzle
- braking
- oil spray
- motor vehicle
- piston
- 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.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000007921 spray Substances 0.000 claims abstract description 31
- 230000004913 activation Effects 0.000 claims abstract description 9
- 230000000977 initiatory effect Effects 0.000 claims abstract description 8
- 239000003921 oil Substances 0.000 claims description 29
- 238000002485 combustion reaction Methods 0.000 claims description 10
- 239000010705 motor oil Substances 0.000 claims description 7
- 238000004590 computer program Methods 0.000 claims description 4
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 5
- 230000006837 decompression Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P3/00—Liquid cooling
- F01P3/06—Arrangements for cooling pistons
- F01P3/08—Cooling of piston exterior only, e.g. by jets
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M1/00—Pressure lubrication
- F01M1/08—Lubricating systems characterised by the provision therein of lubricant jetting means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/14—Controlling of coolant flow the coolant being liquid
- F01P2007/146—Controlling of coolant flow the coolant being liquid using valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P2025/00—Measuring
- F01P2025/08—Temperature
- F01P2025/46—Engine parts temperature
-
- 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
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/12—Introducing corrections for particular operating conditions for deceleration
- F02D41/123—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
Verfahren (10) zum Unterstützen einer Bremsung bei einem Kraftfahrzeug mit einem durch eine Ölspritzdüse (21) gekühlten Kolben (25), wobei ein Einleiten (11) der Bremsung erkannt wird und auf das Einleiten (11) der Bremsung hin die Ölspritzdüse (21) aktiviert wird, wobei während der Bremsung eine Aktivierungsdauer der Ölspritzdüse (21) gemessen und die Ölspritzdüse (21) deaktiviert wird, wenn die Aktivierungsdauer eine vorgegebene Zeitspanne (t) überschreitet.Method (10) for supporting braking in a motor vehicle with a piston (25) cooled by an oil spray nozzle (21), initiation (11) of braking being detected and the oil spray nozzle (21) being activated (11) when braking is initiated is activated, an activation duration of the oil spray nozzle (21) being measured during braking and the oil spray nozzle (21) being deactivated if the activation duration exceeds a predetermined period of time (t).
Description
Die vorliegende Erfindung betrifft ein Verfahren zum Unterstützen der Bremsung bei einem Kraftfahrzeug. Die vorliegende Erfindung betrifft darüber hinaus ein entsprechendes Kraftfahrzeug, ein entsprechendes Computerprogramm sowie ein entsprechendes Speichermedium.The present invention relates to a method for assisting braking in a motor vehicle. The present invention also relates to a corresponding motor vehicle, a corresponding computer program and a corresponding storage medium.
Stand der TechnikState of the art
In der Antriebstechnik ist der innere mechanische Widerstand, welchen ein Motor einem von außen aufgezwungenem Drehmoment entgegensetzt, als Motorbremse, die entsprechende Verlustleistung als Motorschleppleistung bekannt. Die resultierende Umwandlung von Bewegungsenergie in Wärme oder andere Energieformen durch entgegenwirkende Reibungs- und Kompressionskräfte des mitlaufenden Motors kann nutzbringend zur Verzögerung bei Kraftfahrzeugen eingesetzt werden, um eine beispielsweise vom Fahrer eingeleitete Bremsung zu unterstützen.In drive technology, the internal mechanical resistance that an engine opposes to an externally imposed torque is known as the engine brake, and the corresponding power loss is known as engine drag power. The resulting conversion of kinetic energy into heat or other forms of energy by counteracting frictional and compressive forces of the running motor can be used beneficially for deceleration in motor vehicles in order to support driver-initiated braking, for example.
Beispielsweise aus der Schrift
Unabhängig vom Phänomen der Motorbremse sind Motoren bekannt, die über eine Kolbenkühlung durch sogenannte Kolbenspritzen verfügen und so durch ein Anspritzen der Kolbenunterseite mit Motoröl den Kolben kühlen können. Diese Ölspritzdüsen sind beispielsweise über ein extern ansteuerbares Ventil an- und ausschaltbar. Alternativ können die Ölspritzdüsen über ein federbelastetes Ventil geschaltet werden. Im letzteren Fall weist das Ventil eine federbelastete Kugel auf, die ab einem bestimmten Öldruck öffnet und so das Öl zu den Spritzdüsen strömen lässt.Irrespective of the phenomenon of the engine brake, engines are known which have piston cooling by so-called piston spraying and can thus cool the piston by spraying engine oil on the underside of the piston. These oil spray nozzles can be switched on and off, for example, via an externally controllable valve. Alternatively, the oil spray nozzles can be switched using a spring-loaded valve. In the latter case, the valve has a spring-loaded ball that opens at a certain oil pressure, allowing the oil to flow to the spray nozzles.
Messungen, welche eine zunehmende Reibung der Kolbengruppe während der Ölkühlung nahelegen, dokumentiert HEUBERGER, Axel. Neue Werkstoffe und Oberflächengestaltung bei Zylinderlaufbahnen zur Absenkung der Reibung der Kolbengruppe bei Verbrennungsmotoren. Institut für Maschinenelemente und Konstruktionstechnik, 2008.HEUBERGER, Axel, documents measurements which suggest increasing friction of the piston group during oil cooling. New materials and surface design for cylinder liners to reduce friction in the piston group in combustion engines. Institute for Machine Elements and Design Technology, 2008.
Offenbarung der ErfindungDisclosure of Invention
Die Erfindung stellt ein Verfahren zum Unterstützen der Bremsung bei einem Kraftfahrzeug, ein entsprechendes Kraftfahrzeug, ein entsprechendes Computerprogramm sowie ein entsprechendes Speichermedium gemäß den unabhängigen Ansprüchen bereit.The invention provides a method for supporting braking in a motor vehicle, a corresponding motor vehicle, a corresponding computer program and a corresponding storage medium according to the independent claims.
Ein Vorzug dieser Lösung liegt darin, dass sie die Motorschleppleistung erhöht und somit eine stärkere Bremswirkung des Motors hervorruft.An advantage of this solution is that it increases the engine's drag power and thus causes a stronger engine braking effect.
Weitere vorteilhafte Ausgestaltungen der Erfindung sind in den abhängigen Patentansprüchen angegeben. So kann die Ölspritzdüse unmittelbar nach dem Einleiten der Bremsung aktiviert und erst wieder deaktiviert werden, sobald die Bremsung vollzogen ist. Während der Motorbremsphase bleiben die Kolbenspritzen so aktiviert und die Reib- bzw. Schleppleistung des Motors erhöht, was eine besonders effektive Motorbremsung ermöglicht.Further advantageous refinements of the invention are specified in the dependent patent claims. In this way, the oil spray nozzle can be activated immediately after initiating the braking and only deactivated again as soon as the braking has been completed. During the engine braking phase, the piston syringes remain activated and the friction or drag power of the engine increases, which enables particularly effective engine braking.
Figurenlistecharacter list
Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und werden im Folgenden näher beschrieben.
-
1 zeigt ein Flussdiagramm, welches ein erfindungsgemäßes Verfahren beispielhaft darstellt. -
2 zeigt das Kurbelgehäuse des Motors eines erfindungsgemäßen Kraftfahrzeuges.
-
1 shows a flow chart, which represents a method according to the invention by way of example. -
2 shows the crankcase of the engine of a motor vehicle according to the invention.
Ausführungsformen der ErfindungEmbodiments of the invention
Die erfindungsgemäße Bremsunterstützung sei nunmehr anhand einer Zusammenschau der
Erkennt die Fahrzeugelektronik, dass eine Bremsung eingeleitet wird (Prozess 11 -
In einer Variante dieses Verfahrens (10) wird die Ölspritzdüse (21) auf das Einleiten (11) der Bremsung hin nur aktiviert, wenn die Temperatur (27) am Kolben (25) oberhalb oder gleich einer Grenztemperatur ist. Außerdem kann die Ölspritzdüse (21) wieder deaktiviert werden, wenn die Kolbentemperatur (27) unter die Grenztemperatur fällt. Denkbar ist auch, die Aktivierung (12) der Ölspritzdüse (21) an anderweitige Kriterien zu binden. Die Kolbentemperatur (27) kann gemessen, berechnet oder einem Kennfeld entnommen werden.In a variant of this method (10), the oil spray nozzle (21) is only activated upon the initiation (11) of braking if the temperature (27) on the piston (25) is above or equal to a limit temperature. In addition, the oil spray nozzle (21) can be deactivated again if the piston temperature (27) falls below the limit temperature. It is also conceivable to link the activation (12) of the oil spray nozzle (21) to other criteria. The piston temperature (27) can be measured, calculated or taken from a map.
Erfindungsgemäß ist jedenfalls vorgesehen, die Zeitspanne t, in der die Ölspritzdüse (21) während eines Motorbremsvorgangs aktiviert sind, zu begrenzen, sodass spätestens nach Ablauf der Zeitspanne t die Ölspritzdüse (21) deaktiviert wird. Wird der Motorbremsvorgang vor Ablauf der Zeitspanne t beendet, wird auch die Ölspritzdüse (21) vor Ablauf der Zeitspanne t deaktiviert.In any case, the invention provides for the time period t in which the oil spray nozzle (21) is activated during engine braking to be limited, so that the oil spray nozzle (21) is deactivated at the latest after the time period t has elapsed. If the engine braking process ends before the time t has elapsed, the oil spray nozzle (21) is also deactivated before the time t has elapsed.
BezugszeichenlisteReference List
- 1010
- VerfahrenProceedings
- 1111
- Einleiten der Bremsunginitiation of braking
- 1212
- Aktivierung der ÖlspritzdüseActivation of the oil spray nozzle
- 2020
- Verbrennungsmotorcombustion engine
- 2121
- Ölspritzdüseoil spray nozzle
- 2222
- MotorölEngine oil
- 2323
- Zylindercylinder
- 2424
- Kurbelgehäusecrankcase
- 2525
- KolbenPistons
- 2626
- Kolbenbodenpiston crown
- 2727
- Temperaturtemperature
Claims (9)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102022109301.8A DE102022109301B3 (en) | 2022-04-14 | 2022-04-14 | Method for supporting braking in a motor vehicle and corresponding motor vehicle |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102022109301.8A DE102022109301B3 (en) | 2022-04-14 | 2022-04-14 | Method for supporting braking in a motor vehicle and corresponding motor vehicle |
Publications (1)
Publication Number | Publication Date |
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DE102022109301B3 true DE102022109301B3 (en) | 2023-08-17 |
Family
ID=87430299
Family Applications (1)
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DE102022109301.8A Active DE102022109301B3 (en) | 2022-04-14 | 2022-04-14 | Method for supporting braking in a motor vehicle and corresponding motor vehicle |
Country Status (1)
Country | Link |
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DE (1) | DE102022109301B3 (en) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4414400A1 (en) | 1994-04-26 | 1995-11-09 | Rexroth Mannesmann Gmbh | Engine brake for a multi-cylinder internal combustion engine |
DE10206769A1 (en) | 2002-02-19 | 2003-09-04 | Daimler Chrysler Ag | Operating internal combustion engine with turbo brake, involves reducing piston cooling by reducing coolant feed to piston during engine braking mode |
US6705282B2 (en) | 2002-03-01 | 2004-03-16 | International Engine Intellectual Property Company, Llc | Method and apparatus to provide engine compression braking |
CN105649747A (en) | 2016-01-06 | 2016-06-08 | 潍柴动力股份有限公司 | Electronically controlled piston cooling nozzle control method and system |
EP3150821B1 (en) | 2015-09-29 | 2019-04-24 | FPT Motorenforschung AG | Internal combustion engine provided with a piston cooling system |
CN110878721A (en) | 2019-12-05 | 2020-03-13 | 宁波吉利罗佑发动机零部件有限公司 | Piston device, piston temperature control system and method and vehicle |
JP2020101147A (en) | 2018-12-25 | 2020-07-02 | トヨタ自動車株式会社 | Control device of internal combustion engine |
-
2022
- 2022-04-14 DE DE102022109301.8A patent/DE102022109301B3/en active Active
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4414400A1 (en) | 1994-04-26 | 1995-11-09 | Rexroth Mannesmann Gmbh | Engine brake for a multi-cylinder internal combustion engine |
DE10206769A1 (en) | 2002-02-19 | 2003-09-04 | Daimler Chrysler Ag | Operating internal combustion engine with turbo brake, involves reducing piston cooling by reducing coolant feed to piston during engine braking mode |
US6705282B2 (en) | 2002-03-01 | 2004-03-16 | International Engine Intellectual Property Company, Llc | Method and apparatus to provide engine compression braking |
EP3150821B1 (en) | 2015-09-29 | 2019-04-24 | FPT Motorenforschung AG | Internal combustion engine provided with a piston cooling system |
CN105649747A (en) | 2016-01-06 | 2016-06-08 | 潍柴动力股份有限公司 | Electronically controlled piston cooling nozzle control method and system |
JP2020101147A (en) | 2018-12-25 | 2020-07-02 | トヨタ自動車株式会社 | Control device of internal combustion engine |
CN110878721A (en) | 2019-12-05 | 2020-03-13 | 宁波吉利罗佑发动机零部件有限公司 | Piston device, piston temperature control system and method and vehicle |
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