CN113412366A - Method for starting an internal combustion engine of a vehicle - Google Patents
Method for starting an internal combustion engine of a vehicle Download PDFInfo
- Publication number
- CN113412366A CN113412366A CN201980091665.9A CN201980091665A CN113412366A CN 113412366 A CN113412366 A CN 113412366A CN 201980091665 A CN201980091665 A CN 201980091665A CN 113412366 A CN113412366 A CN 113412366A
- Authority
- CN
- China
- Prior art keywords
- combustion engine
- internal combustion
- clutch
- vehicle
- electric motor
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- 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.)
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Classifications
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- 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
- F02D41/009—Electrical control of supply of combustible mixture or its constituents using means for generating position or synchronisation signals
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- 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
- F02D41/009—Electrical control of supply of combustible mixture or its constituents using means for generating position or synchronisation signals
- F02D2041/0092—Synchronisation of the cylinders at engine start
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- 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
- F02D41/008—Controlling each cylinder individually
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- 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
- F02N2019/007—Aiding engine start by starting from a predetermined position, e.g. pre-positioning or reverse rotation using inertial reverse rotation
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- 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
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/62—Hybrid vehicles
Abstract
The invention relates to a method for starting an internal combustion engine of a vehicle, in which method a piston of the internal combustion engine (1) is positioned by moving a crankshaft (2) of the internal combustion engine (1) before ignition of the internal combustion engine (1). In a method of reducing energy consumption for positioning a piston of an internal combustion engine, a crankshaft (2) is moved for positioning the piston by activating a clutch (3) mounted in a drive train of the vehicle.
Description
Technical Field
The invention relates to a method for starting an internal combustion engine of a vehicle, in which method a piston of the internal combustion engine is positioned by moving a crankshaft of the internal combustion engine before ignition of the internal combustion engine.
Background
DE 102012201102 a1 discloses a method for starting an internal combustion engine with a cumulative torque by means of an electric machine, wherein the cumulative torque is operated in a fluctuating mode over a rotational angle of a crankshaft of the internal combustion engine and the electric machine is rotationally coupled to the crankshaft. The electric machine is used to start when the internal combustion engine is in a stopped state, whereby the crankshaft actuating the pistons of the internal combustion engine is set in motion.
When the internal combustion engine is restarted by an electric motor in the hybrid drive train, as is known from the applicant's not yet published german patent application with document number 102018110859.1, a hybrid disconnect clutch arranged between the internal combustion engine and the electric motor is closed and opened in a controlled manner, so that the clutch starts to slip by partial closure in order to start the internal combustion engine.
In addition, it is known to position the piston of an internal combustion engine by means of a targeted injection while the internal combustion engine is coasting. A disadvantage of these methods is that additional structural efforts are required to generate the additional energy required to position the piston of the internal combustion engine.
Disclosure of Invention
The invention is based on the following objectives: a method for starting an internal combustion engine of a vehicle is specified, in which method the piston of the internal combustion engine is optimally positioned and the energy required for this is efficiently provided.
According to the invention, this object is achieved in that: the movement of the crankshaft for positioning the piston is performed by activating a clutch installed in the drive train of the vehicle. By means of the clutch present in the vehicle as such, the crankshaft of the internal combustion engine can be driven without separate components such that the piston of the internal combustion engine enters a predetermined position. The optimal positioning of the piston shortens the ignition process of the internal combustion engine, since the piston of the internal combustion engine is already in the optimal position before ignition. The additional cost of a separate device for positioning the piston can be eliminated.
The clutch is advantageously activated while the vehicle is in motion when the internal combustion engine is not ignited. The kinetic energy that the vehicle can obtain while driving is converted into the force required to position the piston.
In one embodiment, the clutch is activated during a coasting procedure of the vehicle. In the coast mode, the clutch is disengaged in a controlled manner by the electronic control unit when the transmission is engaged. Due to the braking action of the internal combustion engine, the vehicle rolls without losing kinetic energy, and the internal combustion engine driving the vehicle is either turned off or operated below idle speed.
In a variant, the clutch is actuated in a sliding manner in the closing direction until the piston of the internal combustion engine is positioned in a predetermined position. During the coasting process, kinetic energy is used to drive the crankshaft. The slipping clutch transmits the torque borne by the output shaft connected to the wheels to the crankshaft of the internal combustion engine. The movement of the crankshaft is maintained until the crankshaft has brought the piston to the optimum position for the first ignition at hand.
In one embodiment, the clutch is fully disengaged after positioning of the piston is complete. Therefore, the piston of the internal combustion engine can be kept in the set state, and therefore ignition can occur immediately at the time of start of the internal combustion engine.
In a further development, the hybrid disconnect clutch serves as a clutch for disconnecting or connecting the internal combustion engine from or to the electric motor, wherein the internal combustion engine is restarted by the electric motor during the electric-only drive. Since in such a hybrid powertrain the internal combustion engine is also directly connected to the hybrid disconnect clutch via the crankshaft, the position of the piston of the internal combustion engine can be easily adjusted.
Advantageously, the hybrid disconnect clutch disconnects or connects the internal combustion engine from a first electric motor arranged on the output side and forwards the torque output by the internal combustion engine and/or the first electric motor to the driving wheels of the hybrid vehicle, wherein a second electric motor arranged on the internal combustion engine side and permanently connected to the unignited internal combustion engine at the speed of the internal combustion engine is moved. In this embodiment, wherein the second electric motor is used to power the first electric motor, this does not constitute an obstacle to starting the internal combustion engine.
In one embodiment, during electric drive of the hybrid vehicle by the first electric motor, the slipping hybrid disconnect clutch accelerates the unignited internal combustion engine until the first ignition of the internal combustion engine. Therefore, in such a hybrid system, after the piston of the internal combustion engine has been positioned, it is simply ignited.
Drawings
The invention allows many embodiments. One of these embodiments will be described in more detail with reference to the various figures shown in the accompanying drawings.
In these figures:
fig. 1 shows a first exemplary embodiment for carrying out the method according to the present invention.
Fig. 2 shows a second exemplary embodiment for implementing the method according to the present invention.
Fig. 3 shows an exemplary embodiment of the method according to the present invention.
Detailed Description
Fig. 1 shows a first exemplary embodiment of the method according to the invention in the form of a conventional hybrid drive train. The internal combustion engine 1 is connected via its crankshaft 2 to a hybrid disconnect clutch 3. The electric motor 4 is connected to the hybrid disconnect clutch 3. The hybrid disconnect clutch 3 is simultaneously coupled to a transmission 5 which transmits the drive torque transmitted by the drive motors 1 and 4 to the drive wheels 6.
Fig. 2 shows a further exemplary embodiment of a hybrid drive train 7 of a vehicle. In this hybrid powertrain 7, instead of the transmission, a first electric motor 4 that provides a first drive torque is arranged between the internal combustion engine 1 and the drive wheels 6. The first electric motor 4 is coupled via a hybrid disconnect clutch 3 to a second electric motor 8, which in turn is rigidly connected to the internal combustion engine 1. The crankshaft 2 of the internal combustion engine 1 is connected for common rotation to the rotor 12 of the second electric motor 8. The second electric motor 8 and the internal combustion engine 1 may be connected together with the drive wheels 6. The second electric motor 8 and the internal combustion engine 1 are connected to the clutch input 9 of the hybrid disconnect clutch 3. When the hybrid disconnect clutch 3 is closed, the second electric motor 8 can transmit the second drive torque, and the internal combustion engine 1 can transmit the third drive torque to the drive wheels 6 together.
The rotor 11 of the first electric motor 4, which provides the first drive torque, is connected to the clutch output 10 of the hybrid disconnect clutch 3. The rotor 11 is connected for co-rotation purposes to the clutch output 10 and also to the drive wheel 6.
The first electric motor 4, the second electric motor 8 and the internal combustion engine 1 are connected in series, and the hybrid disconnect clutch 3 is operatively arranged between the first electric motor 4 and the internal combustion engine 1 and between the first electric motor 4 and the second electric motor 8. If the hybrid disconnect clutch 3 is closed, the first electric motor 4 can deliver a first drive torque to the drive wheel 6 and the second electric motor 8 can deliver a second drive torque to the drive wheel. Whether the internal combustion engine 1 provides the third driving torque and also delivers the third driving torque to the drive wheels 6 when the hybrid disconnect clutch 3 is closed depends on the rotational speed of the internal combustion engine 1.
When at least the second electric motor 8 provides the second driving torque, the internal combustion engine 1 rotates at the first rotational speed. If the first rotational speed is lower than the idle speed of the internal combustion engine 1, the electric motor 2 runs freely and the internal combustion engine 1 is towed. There is a drag torque of the internal combustion engine 1 that counteracts the second driving torque.
When the first rotational speed corresponds to or is higher than the idle speed of the internal combustion engine 1, the internal combustion engine 1 is actively operated and provides a third driving torque. The third drive torque is added to the first drive torque and, if the second electric motor 8 is also operated, also to the second drive torque to form a total drive torque which is present at the drive wheels 6 for driving the hybrid vehicle when the hybrid disconnect clutch 3 is closed.
The hybrid powertrain described in fig. 1 and 2 may be used to set the position of the piston of the internal combustion engine 1 before the internal combustion engine 1 is started. This process will be explained in more detail with reference to fig. 3. Fig. 3a shows the vehicle speed v over time t, while in fig. 3b the speed n of the internal combustion engine 1 over time t is shown. Fig. 3c shows the clutch position Δ s of the hybrid disconnect clutch 3 over time t. It is assumed that the vehicle is in motion and the driver releases the accelerator pedal and the engine control means switches off the internal combustion engine 1 in order to start the coasting procedure. This state is illustrated by the three vertical lines a in fig. 3a to 3 c. Until time t1, the vehicle is running at constant speed v, and the internal combustion engine 1 is running at approximately constant speed n with the hybrid disconnect clutch 3 closed. At time t1 (line a), the hybrid disconnect clutch 3 is disconnected. When the internal combustion engine 1 is switched off, the speed n of the internal combustion engine is gradually reduced, which results in a transition to the coasting mode in which the hybrid disconnect clutch 3 is disengaged. In the following, the term "coasting" is to be understood as meaning the automatic disconnection of the hybrid disconnect clutch, in particular during driving of the vehicle, wherein the internal combustion engine 1 is additionally selected to be switched off in these coasting phases. The purpose of coasting is to decouple the internal combustion engine 1 from the drive train to avoid its drag torque as lost torque, which results in fuel savings.
As shown in fig. 3b, the disconnected hybrid disconnect clutch 3 decouples the internal combustion engine 1 from the drive train and allows the operation to be stopped. The vehicle is now in a coasting condition. After the speed of the internal combustion engine 1 has reached the value 0, the hybrid disconnect clutch 3 is actuated by slipping in the closing direction at time t2 (fig. 3 c). Due to the movement of the vehicle, the kinetic energy of the vehicle is used to drive the crankshaft of the internal combustion engine 1 via the output shaft of the hybrid disconnect clutch 3, which is connected to the wheels of the vehicle, until the piston of the internal combustion engine 1 is set at a predetermined position. If this predetermined position is reached, the hybrid disconnect clutch 3 is completely disconnected again (time t 3). The piston of the internal combustion engine 1 is now optimally positioned, thereby shortening the time before the first ignition of the internal combustion engine 1.
This solution is not limited to hybrid vehicles, but can also be used in conventional drivetrains with only an internal combustion engine and an automatic clutch, since the automatic clutch is always equipped with an electronic control device.
List of reference numerals
1 combustion engine 2 crankshaft 12 hybrid disconnect clutch 4 electric motor 5 transmission 6 drive wheel 7 hybrid drive train 8 electric motor 9 clutch input 10 clutch output 11 rotor 12 rotor v vehicle speed t time Δ s clutch stroke n combustion engine speed.
Claims (8)
1. A method for starting an internal combustion engine of a vehicle, in which method a piston of the internal combustion engine (1) is positioned via a movement of a crankshaft (2) of the internal combustion engine (1) before ignition of the internal combustion engine (1), characterized in that the movement of the crankshaft (2) for positioning the piston is effected by activating a clutch (3) installed in a drive train of the vehicle.
2. The method according to claim 1, characterized in that the clutch (3) is activated during vehicle operation by means of an unignited internal combustion engine (1).
3. Method according to claim 2, characterized in that the clutch (3) is activated during the coasting procedure of the vehicle.
4. A method according to claim 1, 2 or 3, characterised in that the clutch (3) is actuated by slipping in closing direction until the piston of the internal combustion engine (1) is positioned in a predetermined position.
5. Method according to at least one of the preceding claims, characterized in that the clutch (3) is completely disconnected after the piston has been positioned.
6. Method according to at least one of the preceding claims, characterized in that a hybrid disconnect-type clutch (3) is used as a clutch for disconnecting or connecting the internal combustion engine (1) from an electric motor (4), wherein the internal combustion engine (1) is started by the electric motor (4, 8) during purely electric drive.
7. The method according to claim 6, characterized in that the hybrid disconnect-type clutch (3) disconnects or connects the internal combustion engine (1) from a first electric motor (4) arranged on the output side and the torque output by the internal combustion engine (1) and/or the first electric motor (4) is transmitted to the driving wheels (6) of the hybrid vehicle, a second electric motor (8) arranged on the internal combustion engine side and connected to the internal combustion engine which is not ignited being moved at the speed (n) of the internal combustion engine (1).
8. The method according to claims 6 and 7, characterized in that during electric drive of the hybrid vehicle by the first electric motor (4), the slipping hybrid disconnect clutch (3) accelerates the internal combustion engine (1) which is not ignited until the first ignition of the internal combustion engine (1).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102019103764.6A DE102019103764A1 (en) | 2019-02-14 | 2019-02-14 | Method for starting an internal combustion engine of a vehicle |
| DE102019103764.6 | 2019-02-14 | ||
| PCT/DE2019/101043 WO2020164651A1 (en) | 2019-02-14 | 2019-12-05 | Method for starting an internal combustion engine of a vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113412366A true CN113412366A (en) | 2021-09-17 |
Family
ID=69024070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201980091665.9A Pending CN113412366A (en) | 2019-02-14 | 2019-12-05 | Method for starting an internal combustion engine of a vehicle |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN113412366A (en) |
| DE (1) | DE102019103764A1 (en) |
| WO (1) | WO2020164651A1 (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070157899A1 (en) * | 2004-04-16 | 2007-07-12 | Martin Seufert | Method for controlling the start-up phase of a motor vehicle |
| DE102008043945A1 (en) * | 2008-11-20 | 2010-05-27 | Robert Bosch Gmbh | Method and device for operating a hybrid drive for a vehicle |
| US20130080039A1 (en) * | 2011-09-26 | 2013-03-28 | Mazda Motor Corporation | Device and method for controlling start of compression self-ignition engine |
| JP2013119301A (en) * | 2011-12-07 | 2013-06-17 | Daimler Ag | Engine stop controller for hybrid electric vehicle |
| DE102014207921A1 (en) * | 2013-05-06 | 2014-11-06 | Ford Global Technologies, Llc | METHOD AND SYSTEM FOR MOTOR POSITION CONTROL |
| DE102015113125A1 (en) * | 2014-08-18 | 2016-02-18 | Ford Global Technologies, Llc | Methods and systems for starting an engine |
| WO2016082829A1 (en) * | 2014-11-28 | 2016-06-02 | Schaeffler Technologies AG & Co. KG | Method for starting an internal combustion engine of a hybrid vehicle |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE112012000738A5 (en) | 2011-02-09 | 2013-11-14 | Schaeffler Technologies AG & Co. KG | Method and device for starting an internal combustion engine |
| DE102018110859B4 (en) | 2018-05-07 | 2020-03-19 | Schaeffler Technologies AG & Co. KG | Method for restarting an internal combustion engine in a hybrid powertrain |
-
2019
- 2019-02-14 DE DE102019103764.6A patent/DE102019103764A1/en active Pending
- 2019-12-05 WO PCT/DE2019/101043 patent/WO2020164651A1/en active Application Filing
- 2019-12-05 CN CN201980091665.9A patent/CN113412366A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070157899A1 (en) * | 2004-04-16 | 2007-07-12 | Martin Seufert | Method for controlling the start-up phase of a motor vehicle |
| DE102008043945A1 (en) * | 2008-11-20 | 2010-05-27 | Robert Bosch Gmbh | Method and device for operating a hybrid drive for a vehicle |
| US20130080039A1 (en) * | 2011-09-26 | 2013-03-28 | Mazda Motor Corporation | Device and method for controlling start of compression self-ignition engine |
| JP2013119301A (en) * | 2011-12-07 | 2013-06-17 | Daimler Ag | Engine stop controller for hybrid electric vehicle |
| DE102014207921A1 (en) * | 2013-05-06 | 2014-11-06 | Ford Global Technologies, Llc | METHOD AND SYSTEM FOR MOTOR POSITION CONTROL |
| DE102015113125A1 (en) * | 2014-08-18 | 2016-02-18 | Ford Global Technologies, Llc | Methods and systems for starting an engine |
| WO2016082829A1 (en) * | 2014-11-28 | 2016-06-02 | Schaeffler Technologies AG & Co. KG | Method for starting an internal combustion engine of a hybrid vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020164651A1 (en) | 2020-08-20 |
| DE102019103764A1 (en) | 2020-08-20 |
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