WO2001088370A1 - Startverfahren und startvorrichtung für brennkraftmaschinen - Google Patents
Startverfahren und startvorrichtung für brennkraftmaschinen Download PDFInfo
- Publication number
- WO2001088370A1 WO2001088370A1 PCT/DE2001/001168 DE0101168W WO0188370A1 WO 2001088370 A1 WO2001088370 A1 WO 2001088370A1 DE 0101168 W DE0101168 W DE 0101168W WO 0188370 A1 WO0188370 A1 WO 0188370A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- starting
- compression
- internal combustion
- crankshaft
- combustion engine
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N19/00—Starting aids for combustion engines, not otherwise provided for
- F02N19/005—Aiding engine start by starting from a predetermined position, e.g. pre-positioning or reverse rotation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N19/00—Starting aids for combustion engines, not otherwise provided for
- F02N19/004—Aiding engine start by using decompression means or variable valve actuation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N99/00—Subject matter not provided for in other groups of this subclass
- F02N99/002—Starting combustion engines by ignition means
- F02N99/006—Providing a combustible mixture inside the cylinder
Definitions
- the invention relates to a starting method for an internal combustion engine of a motor vehicle according to the preamble of claim 1 and a starting device for performing the method.
- Motor vehicles that are optimized in terms of fuel consumption may require. a. a shutdown of the
- the rotating flywheel is connected to the crankshaft for a so-called impulse start.
- the disadvantage here is that the weight of the vehicle and thus the fuel consumption increase with the flywheel, and that a relatively long take-off time and, accordingly, a lot of electrical energy are required to turn up the flywheel.
- a dynamic starting sequence is also made more difficult by the fact that with the first full compression of a cylinder at its top dead center, the speed of the crankshaft drops so much that there is still no ignition in order to avoid backward swinging in the first cylinder under compression. may .
- the aim of the present solution is to reduce the torque of the electrical machine and the starting time of the internal combustion engine.
- the starting method according to the invention for the internal combustion engine of a motor vehicle with the characterizing features of claim 1 and the starting unit provided for carrying out the method with the characterizing features of claim 19 has the advantage that a reduction in compression and degree of filling carried out by the starting control device in the first, in the Starting phase in compression going cylinder of the internal combustion engine a significant reduction in
- Torque of the electrical machine during a warm and cold start and by avoiding a so-called impulse start, a significant reduction in the start time during a cold start is achieved.
- This also provides effective support for the electrical machine turning the motor during start-stop operation, which leads to a leads to a significant reduction in the warm start time.
- Another advantage is that even with less than half a revolution of the crankshaft, a first combustion in the first is already in compression Cylinder can be triggered, which supports the full torque of the electrical machine, so that a torque that leads to self-running is generated on the crankshaft of the internal combustion engine within a very short time.
- the drag torque of the internal combustion engine can also be determined for this by rotating the crankshaft by means of the electrical machine in a manner known per se and used to trigger a cold start or warm start.
- Torque of the electrical machine during the starting phase is supported by several burns with reduced compression and a lower degree of air filling.
- the gradation can be predefined by the start control device. In an advantageous manner, however, it is proposed that compression and degree of filling each depend on the preceding speed behavior of the engine with the
- Torque of the crankshaft loaded with the electric machine can be controlled with a suitable program of the start control unit.
- the crankshaft is brought into a first starting position for a warm start or into a subsequent second starting position for a cold start of the internal combustion engine in the positioning phase.
- the starting position is advantageously specified by the starting control device at approximately 60 ° before the top dead center of the compression cylinder.
- the starting position is advantageously specified at approximately 40 ° before the top dead center of the cylinder in compression.
- Valve control is particularly suitable, but mechanical valve lift controls are also considered as alternatives. Since the load or gas spring torques of the successive compressions add up in a disturbing manner in internal combustion engines with large numbers of cylinders, it is advantageously proposed that in internal combustion engines with an even number of cylinders more than six cylinders on every second cylinder going into compression, the degree of filling and the Compression is controlled to zero. The filling levels of the other cylinders can then, as mentioned above, be coordinated in stages. The transition to the full number of cylinders can be made easily via the start control unit when the speed exceeds a " predetermined limit value for self-starting.
- the crankshaft For each starting process, the crankshaft must first be brought into its starting position by the electrical machine in the positioning phase; with regard to the first cylinder in compression. In the case of a warm start in the so-called start-stop operation, this is advantageously achieved in that, when the stop phase begins, the crankshaft is brought into its starting position by the electric machine and held until the subsequent start phase to be triggered by the vehicle driver. In the case of a cold start, on the other hand, the crankshaft is turned solely by the electrical machine into the start position assigned to the cold start. As an alternative to free valve control, the compression and the degree of filling must also be reduced via so-called leakages in the cylinder.
- crankshaft is expediently first brought into its starting position by the electrical machine during the positioning phase in order to reduce the degree of compression and filling via leakages of the cylinder by a predetermined dwell time in the starting position until the start of the starting phase.
- crankshaft is expediently held in its starting position until the gas spring pressure of the cylinder in compression has dropped to a residual value.
- an injection control known per se also reduces accordingly
- Amounts of fuel injected into the respective cylinders are particularly advantageous.
- the predetermined amount of fuel is injected during the first compression phase with reduced compression.
- the starting method according to the invention is carried out with a starting device in which the starting control device with a rotation and position sensor of the crankshaft and on the output side with the electric machine
- Valve control and the fuel injection control of the internal combustion engine is connected.
- Fig. 1 shows the drive unit of a motor vehicle in a schematic representation with a starting device for performing the starting method according to the invention
- Fig. 2 shows a table for a gradual reduction in the degree of filling by gradual closing of the respective intake valve before top dead center or by gradual opening and closing before bottom dead center.
- the internal combustion engine is designated by 10. It is a four-cylinder gasoline engine, the crankshaft 11 of which cooperates with a rotation and position sensor 12. Furthermore, the crankshaft 11 is connected via a manual transmission 13 to an electrical machine 14 which acts as a starter
- crankshaft 11 is also connected via a clutch 15 to a vehicle transmission 16, via the output of which drive wheels 17 of the motor vehicle (not shown) are driven by the internal combustion engine 10. Furthermore, there is an electronic engine control unit 18 with which the injection valves, not shown, intake and exhaust valves and the ignition on the individual cylinders of the internal combustion engine 10 are controlled and in which the position of the crankshaft is also detected .
- Engine control unit 18 is also electrically connected to an electronic start control unit 19, which is connected on the input side to the rotation and position sensor 12 via a signal line 20 and on the output side both the manual transmission 13 and the electrical machine 14 controls. 'It also communicates with the engine control unit 18.
- the transmission 13 is such controlled by the start control device 19, it then motor-driven electrical machine 14 alsschaltet at start-up operations with high torque and low speed to the crankshaft. 11 in the
- the first starting process is always a cold start. It is triggered when the start switch 21 is closed. in the
- Start control device 19 the position of the crankshaft 11 and thus the positions of the pistons in the cylinders is detected by the sensor 12.
- the electrical machine 14 and the manual transmission 13 are switched to engine operation by the start control device 19 and the electrical machine 14 begins to turn the crankshaft 11 into its start position specified for a cold start with a torque specified by the start control device 19.
- the inlet valve on the first cylinder that compresses when the crankshaft rotates Start control unit 19 opened or kept open via the engine control unit 18 until the. Starting position at 40 ° before top dead center (TDC) of the cylinder in compression is reached.
- TDC top dead center
- the intake valve of the second cylinder now closes at 60 ° before top dead center in order to achieve a reduced degree of compression and filling.
- a correspondingly reduced amount of fuel is now injected, and after about 1/3 crankshaft rotation, a second combustion, which supports the run-up of the internal combustion engine 10, is triggered in the second cylinder:
- the third cylinder goes into compression and here too the start valve 19 activates the intake valve of the third cylinder only closed 80 ° before top dead center.
- the third compression is thus also reduced and after about 1/3 crankshaft rotation there is a third combustion which supports the startup of the internal combustion engine.
- the starting control device 19 detects the cylinder that first compresses during a subsequent warm start, and the crankshaft with the help of the electric machine 14 into one. Warm start given predetermined start position. It is held there until the subsequent starting phase to be triggered by the vehicle driver by closing the accelerator pedal switch 22 with the aid of the electric machine 14.
- the inlet valve of the cylinder in question is also kept open up to this starting position. A start position of 60 ° before top dead center (TDC) of the first cylinder in compression is provided for the warm start. With the start phase during the warm start, the inlet valve is now closed, the reduced amount of fuel is injected into the cylinder and the crankshaft 11 is accelerated with the full torque of the electric machine 14. After about 90 ° crankshaft rotation, there is a first
- the start control device 19 also ends the starting process when the idling speed is reached and then switches the electric machine to generator operation.
- the warm start of the internal combustion engine described above is also triggered for this at the end of the overrun phase by actuating the accelerator pedal switch 22.
- the inlet valve on the first cylinder of compression in the internal combustion engine is closed by the start control device 19 at the bottom dead center during a cold start, so that the starting position must be activated by overcoming the start of compression in the first cylinder ,
- the crankshaft 11 of the internal combustion engine 10 is rotated by the electrical machine 14 with a greatly reduced torque into the starting position specified for a cold start, the compression which builds up in the process being largely reduced again by leakages in the cylinder.
- crankshaft 11 is driven by the electrical machine 14 and held there. Due to the leaks in the cylinder, the compression already present in the cylinder is largely reduced during the dwell time until the cylinder is started again, so that when the accelerator pedal switch 22 is closed, the starting phase passes through with reduced first compression and, after about 1/3 crankshaft rotations, a first, the torque of the electrical machine 14 supporting combustion is triggered.
- the crankshaft 11 it is equally possible for the crankshaft 11 to be brought into the starting position with the full starting force of the electrical machine 14 during the positioning phase and for the residence time in the starting position to be determined by the start control device 19 . by closing the intake valve existing partial compression due to leaks in the cylinder is reduced or reduced to such an extent that in the subsequent starting phase compression and degree of filling are reduced to the desired extent in the first cylinder.
- the warm or cold state of the internal combustion engine can therefore be detected by the start control device via the rotational behavior of the internal combustion engine in the positioning phase. Alternatively, this can also be detected by a temperature measurement of the internal combustion engine by the start control device. Depending on the state of the internal combustion engine, the
- the Crankshaft brought into a first starting position for a warm start or into a subsequent second starting position for a cold start of the internal combustion engine.
- the first start position is at about 60 ° before top dead center and the second start position at about 40 ° before top dead center
- the predetermined amount of fuel while 'of the first compression phase with reduced Compression injected.
- the fuel quantity is injected via the intake valve which is still open. The injection preferably starts from the bottom dead center of the cylinder going into compression.
- the reduced compression in the starting phase brings about a reduction in the required torque of the electrical machine from the starting position of the crankshaft. On the other hand, it also achieves a sufficient degree of air filling of 25 to 40%, with which, with a correspondingly adjusted fuel injection quantity, a first combustion in the cylinder, which strongly supports the torque, is then achieved.
- Torque are present. With small and medium cylinder numbers of three to six cylinders and with a diesel engine, these start-position dependencies are particularly pronounced. In the case of starters with a starter generator, a safe and dynamic start function is expected, with a start time of up to a few seconds being acceptable at the cold start limit temperature, while the reduction in the start time is in the foreground during a warm start. The reduction of the required torque is important because the
- Generator operation necessary continuous current on the one hand and the starting current on the other hand in such a relationship that the generator current remains design-determining. In this case, the effort for the electrical Minimize the machine and the inverter required for motor operation.
- the starting sequence and the starting application can be coordinated with a graduated compression and filling level control of the first cylinders contributing to the combustion with a minimal torque, which leads to a safe cold start and a warm start with a significantly reduced starting time.
- speed and rotation angle signals of the electrical machine can also be used.
- the crankshaft may have to be held in its injection position until the end of the injection time.
- the crankshaft is accelerated from its starting position with a relatively small moment of inertia during a warm start.
- the speed In order to overcome the first reduced compression, only about 20% of energy is required compared to full compression, so that the speed already reaches a high value of, for example, 150 to 200 revolutions / minute after an initial acceleration. It will stagnate in the top dead center area of the first cylinder at about this level, but will not totally collapse as when overcoming a full compression.
- crankshaft of the internal combustion engine can also be positioned at cold start limit temperatures with a comparatively small starting torque, which can be, for example, 50% below the full starting torque. This is possible if • a maximum positioning time of around two seconds and the maximum rotation angle to be traversed to the starting position (positioning angle), the ignition interval - ie 180 ° for a four-cylinder machine - are still considered permissible.
- crankshaft in the positioning phase in the second exemplary embodiment is first brought into its starting position with a smaller torque and only then is it switched over to the full torque from this position.
- the suitable starting position is selected in a manner similar to that for warm start positioning so that only a reduced compression has to be carried out in the first acceleration phase.
- the degree of air filling and thus also the torques that can be achieved by combustion after top dead center already have a high value to support the starting process.
- the table shows the degree of air filling in% of the maximum possible value, the degree of compression compared to normal pressure as well as the gas spring pressure measured in bar at top dead center and the resulting gas spring energy at a gradually increasing starting angle.
- the starting angle is the angle that the crankshaft occupies in the starting position relative to the top dead center of the first cylinder that is in compression.
- the table shows that with reduced compression, the gas spring energy to be applied by the electrical machine during the starting process is significantly disproportionately reduced compared to the degree of filling.
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- 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)
- Combined Controls Of Internal Combustion Engines (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001584736A JP2003533640A (ja) | 2000-05-19 | 2001-03-27 | 内燃機関のためのスタート方法及び装置 |
EP01929265A EP1287257A1 (de) | 2000-05-19 | 2001-03-27 | Startverfahren und startvorrichtung für brennkraftmaschinen |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10024438A DE10024438A1 (de) | 2000-05-19 | 2000-05-19 | Startverfahren und Startvorrichtung für Brennkraftmaschinen |
DE10024438.6 | 2000-05-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001088370A1 true WO2001088370A1 (de) | 2001-11-22 |
Family
ID=7642573
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2001/001168 WO2001088370A1 (de) | 2000-05-19 | 2001-03-27 | Startverfahren und startvorrichtung für brennkraftmaschinen |
Country Status (5)
Country | Link |
---|---|
US (1) | US20030172893A1 (de) |
EP (1) | EP1287257A1 (de) |
JP (1) | JP2003533640A (de) |
DE (1) | DE10024438A1 (de) |
WO (1) | WO2001088370A1 (de) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2841598A1 (fr) * | 2002-07-01 | 2004-01-02 | Toyota Motor Co Ltd | Appareil de commande pour un moteur a combustion interne et son procede de commande |
FR2858666A1 (fr) * | 2003-07-31 | 2005-02-11 | Bosch Gmbh Robert | Procede de demarrage d'un moteur a combustion interne a plusieurs cylindres |
WO2005100777A2 (de) | 2004-04-16 | 2005-10-27 | Avl List Gmbh | Verfahren zur steuerung des anfahrvorganges eines kraftfahrzeuges |
AT413866B (de) * | 2004-04-16 | 2006-06-15 | Avl List Gmbh | Verfahren zum starten einer brennkraftmaschine |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1367256B1 (de) | 2002-05-14 | 2007-04-18 | Ford Global Technologies, LLC | Verfahren zur Vorbereitung des Anlassens einer Brennkraftmaschine |
FR2843613A1 (fr) * | 2003-01-29 | 2004-02-20 | Siemens Vdo Automotive | Procede et dispositif pour ameliorer le redemarrage d'un moteur, par detection d'une position absolue d'un organe mobile |
FR2843614A1 (fr) * | 2003-01-29 | 2004-02-20 | Siemens Vdo Automotive | Procede et dispositif pour ameliorer le redemarrage du moteur, par detection d'une position relative d'un organe mobile |
DE102004006337A1 (de) | 2004-02-10 | 2005-08-25 | Robert Bosch Gmbh | Vorrichtung und Verfahren zur Winkelverstellung einer Kurbelwelle |
DE102004032918B4 (de) * | 2004-07-08 | 2016-06-02 | Robert Bosch Gmbh | Vorrichtung und Verfahren zum Start einer Brennkraftmaschine mit mehreren Zylindern |
EP1679438A1 (de) | 2005-01-10 | 2006-07-12 | Ford Global Technologies, LLC, A subsidary of Ford Motor Company | Verfahren zum Starten einer Brennkraftmaschine |
JP2007198185A (ja) * | 2006-01-24 | 2007-08-09 | Kokusan Denki Co Ltd | エンジン始動装置 |
FR2912190B1 (fr) * | 2007-02-07 | 2013-06-14 | Peugeot Citroen Automobiles Sa | Procede de demarrage du moteur thermique d'un vehicule automobile hybride |
DE102012210890B4 (de) * | 2012-06-26 | 2021-03-18 | Seg Automotive Germany Gmbh | Andrehvorrichtung und Verfahren zur Montage einer Andrehvorrichtung |
TWI605191B (zh) * | 2014-11-11 | 2017-11-11 | 財團法人工業技術研究院 | 曲軸角控制方法及其系統 |
DE102019115912B4 (de) * | 2019-06-12 | 2023-03-02 | Volkswagen Aktiengesellschaft | Hubkolbenbrennkraftmaschine mit reduziertem Startmoment aufgrund eines spezifizierten Dekompressionsevents sowie Kraftfahrzeug mit einer und Verfahren zum Starten einer solchen Hubkolbenbrennkraftmaschine |
DE102019115914B4 (de) * | 2019-06-12 | 2021-07-01 | Volkswagen Aktiengesellschaft | Hubkolbenbrennkraftmaschine mit reduziertem Startmoment aufgrund eines spezifizierten Dekompressionsevents an zumindest einem ausgewählten Startzylinder sowie Kraftfahrzeug mit einer und Verfahren zum Starten einer solchen Hubkolbenbrennkraftmaschine |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19736137C1 (de) * | 1997-08-20 | 1998-10-01 | Daimler Benz Ag | Verfahren zum Starten eines Verbrennungsmotors |
DE19808472A1 (de) * | 1998-03-02 | 1999-09-09 | Lsp Innovative Automotive Sys | Verfahren zum Starten eines Kraftfahrzeugmotors |
DE19858992A1 (de) * | 1998-04-20 | 1999-10-21 | Bosch Gmbh Robert | Start-/Antriebseinheit für eine Brennkraftmaschine eines Kraftfahrzeuges |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3730001A1 (de) * | 1987-09-08 | 1989-03-30 | Gerhard Werner Kappelmeier | Ventilbetaetigungsmechanismus fuer eine verbrennungskraftmaschine |
JP3250483B2 (ja) * | 1996-07-18 | 2002-01-28 | トヨタ自動車株式会社 | 駆動装置 |
-
2000
- 2000-05-19 DE DE10024438A patent/DE10024438A1/de not_active Ceased
-
2001
- 2001-03-27 WO PCT/DE2001/001168 patent/WO2001088370A1/de not_active Application Discontinuation
- 2001-03-27 US US10/276,593 patent/US20030172893A1/en not_active Abandoned
- 2001-03-27 JP JP2001584736A patent/JP2003533640A/ja not_active Withdrawn
- 2001-03-27 EP EP01929265A patent/EP1287257A1/de not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19736137C1 (de) * | 1997-08-20 | 1998-10-01 | Daimler Benz Ag | Verfahren zum Starten eines Verbrennungsmotors |
DE19808472A1 (de) * | 1998-03-02 | 1999-09-09 | Lsp Innovative Automotive Sys | Verfahren zum Starten eines Kraftfahrzeugmotors |
DE19858992A1 (de) * | 1998-04-20 | 1999-10-21 | Bosch Gmbh Robert | Start-/Antriebseinheit für eine Brennkraftmaschine eines Kraftfahrzeuges |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2841598A1 (fr) * | 2002-07-01 | 2004-01-02 | Toyota Motor Co Ltd | Appareil de commande pour un moteur a combustion interne et son procede de commande |
US6988477B2 (en) | 2002-07-01 | 2006-01-24 | Toyota Jidosha Kabushiki Kaisha | Control apparatus for an internal combustion engine and control method thereof |
FR2858666A1 (fr) * | 2003-07-31 | 2005-02-11 | Bosch Gmbh Robert | Procede de demarrage d'un moteur a combustion interne a plusieurs cylindres |
WO2005100777A2 (de) | 2004-04-16 | 2005-10-27 | Avl List Gmbh | Verfahren zur steuerung des anfahrvorganges eines kraftfahrzeuges |
AT413866B (de) * | 2004-04-16 | 2006-06-15 | Avl List Gmbh | Verfahren zum starten einer brennkraftmaschine |
US7610891B2 (en) | 2004-04-16 | 2009-11-03 | Avl List Gmbh | Method for controlling the start-up phase of a motor vehicle |
Also Published As
Publication number | Publication date |
---|---|
EP1287257A1 (de) | 2003-03-05 |
US20030172893A1 (en) | 2003-09-18 |
JP2003533640A (ja) | 2003-11-11 |
DE10024438A1 (de) | 2001-11-29 |
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