DE102010060788A1 - Internal combustion engine for motor vehicle, has planetary gear with freewheel that is opened/closed by driving pulley/crankshaft via crankshaft/pulley during generator/motor operation of belt starter generator, respectively - Google Patents

Abstract

The engine has planetary gear (12) with freewheel (13) that is associated with clutch (14) via actuator (15). The freewheel is opened by driving a pulley (10) via crankshaft (11) during generator operation of belt starter generator. The freewheel is closed by driving the crankshaft via the pulley during motor operation of belt starter generator is closed. An independent claim is included for method for operating internal combustion engine.

Description

The invention relates to an internal combustion engine with belt starter generator according to the preamble of claim 1 or 6 and a method for operating such an internal combustion engine.

From the EP 1 282 772 B1 an internal combustion engine is known with a belt starter generator, wherein a crankshaft of the internal combustion engine is associated with a first pulley, wherein a shaft of the belt starter generator is associated with a second pulley, and wherein a belt drive acts on these two pulleys. Furthermore, it is known from this prior art to provide a planetary gear in the power flow between the crankshaft and the pulley associated with the crankshaft of the internal combustion engine so as to provide high torque at low speed for starting the engine at the crankshaft thereof. After EP 1 282 772 B1 are associated with the planetary gear two clutches, wherein a sun gear of the planetary gear is connectable by a first clutch to a housing, and wherein a cage 15 of the planetary gear via a second clutch with a ring gear or ring gear of the planetary gear is connectable. After EP 1 282 772 B1 can be used as clutches friction clutches, positive clutches, freewheels with rolling or clamping body or centrifugal clutches.

Proceeding from this, the present invention seeks to provide a novel internal combustion engine with a belt starter generator. The object is achieved by an internal combustion engine according to claim 1. Thereafter, the planetary gear on the one hand freewheel and on the other hand assigned via an actuator clutch, the freewheel when driving the first pulley on the crankshaft of the engine closed in generator operation of the belt starter generator and when driving the crankshaft on the first pulley in the engine operation of the belt starter generator is opened, and wherein the switchable clutch when driving the first pulley via the crankshaft of the internal combustion engine in generator operation of the belt starter generator is open and closed when driving the crankshaft via the first pulley in the engine operation of the belt starter generator for starting the internal combustion engine.

An internal combustion engine in which the planetary gear is associated with a freewheel and a clutch switchable via an actuator is particularly preferred, since in such an internal combustion engine ancillaries can be driven by the belt starter generator when the internal combustion engine is stationary or the internal combustion engine is stationary.

According to an advantageous embodiment of this internal combustion engine, a third pulley is fixedly connected to the first pulley, which engages a second belt drive to drive ancillaries, with the internal combustion engine of the freewheel and the clutch are open to auxiliary units on the first pulley and third pulley in to drive motor operation of the belt starter generator.

However, the third pulley can also be omitted, then attack on the first pulley both belt drives.

The object is further achieved by an internal combustion engine according to claim 6. Thereafter, the planetary gear two opposing freewheel are assigned, wherein a first freewheel is closed when driving the first pulley on the crankshaft of the internal combustion engine in generator operation of the belt starter generator and when driving the crankshaft on the first pulley in the engine operation of the belt starter generator, and wherein a second Freewheel when driving the first pulley on the crankshaft of the internal combustion engine is open in generator operation of the belt starter generator and closed when driving the crankshaft on the first pulley in the engine operation of the belt starter generator.

An internal combustion engine, in which the planetary gear two freewheels are assigned, is self-switching and requires no external control, but does not allow the drive of ancillary units with a stationary engine starting from the belt starter generator.

According to a first method for operating an internal combustion engine, the crankshaft of the stopped internal combustion engine is rotated before starting the same via the motor-driven belt starter generator in an optimal position for starting.

Then, when the crankshaft is rotated to an optimal start position according to the first inventive method before the start of the internal combustion engine, a time required for starting the internal combustion engine can be significantly reduced. As a result, in a start-stop function, the power flow from the stop operation of a motor vehicle can be made faster.

According to a second method, a run-up of the started internal combustion engine via the motor-driven belt starter generator is supported up to a defined limit speed of the internal combustion engine. Then, according to the second method of the invention, if the engine start-up is assisted by the belt starter generator, the time until the torque load capacity of the internal combustion engine is reached can be reduced. This also allows the power flow from the stop operation of a motor vehicle can be made faster in a start-stop function.

Preferred embodiments of the invention will become apparent from the dependent claims and the description below. Embodiments of the invention will be described, without being limited thereto, with reference to the drawings. Showing:

1 : a schematic section of a first internal combustion engine according to the invention with belt starter generator;

2 : a schematic section of a second internal combustion engine according to the invention with belt starter generator; and

3 : A schematic section of a third internal combustion engine according to the invention with belt starter generator.

The present invention relates to an internal combustion engine with a belt starter generator and method for operating the same.

An internal combustion engine with a belt starter generator has a first pulley 10 that a crankshaft 11 associated with the internal combustion engine, and a second pulley (not shown) associated with a shaft of the belt starter generator (not shown). At the first pulley 10 and the second pulley, not shown, engages a belt drive, not shown.

The present invention relates to such an internal combustion engine with a belt starter generator, in which a planetary gear 12 in the power flow between the crankshaft 11 the internal combustion engine and the first pulley 10 that of the crankshaft 11 the internal combustion engine is assigned, is arranged.

In the embodiment of 1 is the planetary gear 12 a freewheel 13 assigned. The freewheel 13 is when driving the first pulley 10 over the crankshaft 11 the internal combustion engine is closed during generator operation of the belt starter generator and when driving the crankshaft 11 the internal combustion engine in the engine operation of the belt starter generator for starting the internal combustion engine open. In addition to the freewheel 13 is the planetary gear 12 a switchable clutch 14 assigned via an actuator 15 can be opened and closed, with the clutch 14 when driving the first pulley 10 over the crankshaft 11 the internal combustion engine in generator operation of the belt starter generator open and the drive of the crankshaft 11 over the pulley 10 is closed in the engine operation of the belt starter generator for starting the internal combustion engine.

As 1 can be taken, is the crankshaft 11 the internal combustion engine with a sun gear 16 of the planetary gear 12 firmly coupled. The first pulley 10 that of the crankshaft 11 the internal combustion engine is associated with a ring gear 17 of the planetary gear 12 firmly coupled. A jetty 18 of the planetary gear 12 is over the freewheel 13 with the sun wheel 16 of the planetary gear 12 and thus with the crankshaft 11 the internal combustion engine coupled.

The coupling 14 grabs the jetty 18 of the planetary gear 12 on, namely such that when the clutch is closed 14 the jetty 18 of the planetary gear 12 to a stator-side engine block 19 the internal combustion engine is coupled and therefore stands still, whereas with the clutch open 14 the jetty 18 of the planetary gear 12 from the engine block 19 the engine is decoupled and can rotate. As another assembly of the planetary gear 12 shows 1 a planetary gear 20 of the planetary gear 12 , where the planetary gear 20 on the jetty 18 is rotatably mounted and in the ring gear 17 combs.

2 shows a development of the embodiment of 1 , where in 2 a third pulley 21 shown in phantom with the first pulley 10 is coupled, namely such that the first pulley 10 and the third pulley 21 is positioned coaxially with each other. With the third pulley 21 a second belt drive (not shown) acts to drive ancillaries (not shown), such as to drive an air conditioning compressor.

The third pulley 21 However, it can also be omitted, in which case on the first pulley 10 Both belt drives, so the first belt drive and the second belt drive to drive ancillaries, attack.

When the internal combustion engine is stationary and the crankshaft is stationary 11 are the freewheel 13 and the clutch 14 opened to drive ancillary units in the motor operation of the belt starter generator on the same. Herewith It is therefore possible to continue to drive ancillaries in a stop function of the internal combustion engine, namely on the belt starter generator.

Another variant of an internal combustion engine according to the invention is in 3 being shown, being also in 3 in the power flow between the crankshaft 11 the internal combustion engine and the first pulley 10 a planetary gear 12 is arranged.

In the embodiment of 3 are the planetary gear 12 ' two opposing freewheels 22 and 23 assigned. A first freewheel 22 is when driving the first pulley 10 over the crankshaft 11 the internal combustion engine or the internal combustion engine in generator operation of the belt starter generator closed and the drive of the crankshaft 11 over the first pulley 10 opened during motor operation of the belt starter generator, whereas the second freewheel 23 to the first freewheel 22 is in opposite directions, namely such that the second freewheel 23 when driving the first pulley 10 over the crankshaft 11 the internal combustion engine in generator operation of the belt starter generator open and the drive of the crankshaft 11 over the first pulley 10 is closed in the engine operation of the belt starter generator for starting the internal combustion engine.

In the variant of 3 is the crankshaft 11 with the sun wheel 16 ' of the planetary gear 12 ' firmly coupled. The first pulley 10 is about the first freewheel 22 with the sun wheel 16 ' of the planetary gear 12 ' and thus the crankshaft 11 the internal combustion engine coupled. Further, the first pulley 10 over the second freewheel 23 ' with the ring gear 17 of the planetary gear 12 ' coupled with a planetary gear 20 ' of the planetary gear 12 ' on the one hand into the sun wheel 16 ' of the planetary gear 12 ' and on the other hand in the ring gear 17 ' of the planetary gear 12 ' combs. A jetty 18 ' of the planetary gear 12 ' is to the engine block 19 the internal combustion engine coupled and therefore blocked or stopped.

Both embodiments have in common that the belt starter generator via a. Belt drive permanently with the crankshaft 11 the internal combustion engine is connected, so unlike pinion starters no meshing of a gear when starting the engine or the internal combustion engine is required so that compared to a pinion starter the starting process can be shortened.

Furthermore, in all embodiments, a starting time for the internal combustion engine can be further reduced by the fact that the crankshaft 11 the shutdown internal combustion engine is rotated before starting the same via the motor-driven belt starter generator in an optimal position for starting the internal combustion engine. Due to the existing translation of the planetary gear 12 respectively. 12 ' This positioning can be done with high accuracy, so that in comparison to the prior art, a further start time reduction for the internal combustion engine is possible. This turning the crankshaft 11 The internal combustion engine in an optimal starting position is preferably carried out depending on a measured value of a particular associated with the crankshaft position sensor.

Furthermore, in all embodiments, a torque on the crankshaft 11 for starting the internal combustion engine via the translation of the planetary gear 12 respectively. 12 ' can be increased, whereby a start time of the internal combustion engine can be further shortened. So can by increasing the at the crankshaft 11 prevailing torque made a first ignition faster.

The increased torque can be provided via the ratio of the planetary gear without increasing belt forces in the belt drive. There is therefore no risk that the belt drive slips.

Furthermore, in all embodiments of the invention, the engine run-up of the internal combustion engine can be assisted for a faster buildup of traction up to a defined speed limit. As a result, the time to reach the torque load capacity of the internal combustion engine can be reduced.

In the variants of the 1 and 2 ancillaries, such as an air conditioning compressor of an air conditioner, be operated with the engine off, starting from the belt starter generator. This makes it possible to operate ancillary units during engine downtime. As a result, engine starts in stop mode, which are caused by the ancillaries can be avoided. This can ultimately be realized by the start-stop function of the internal combustion engine, a higher fuel economy.

In all variants of the present invention, the cold start capability of an internal combustion engine at low temperatures can be further improved. During a cold start at cryogenic temperatures, the frictional forces in the internal combustion engine increase sharply, so that higher torques are required at the crankshaft to start the engine, as in operating warm engines. This increased torque can be through the translation of the planetary gear 12 respectively. 12 ' to be provided.

LIST OF REFERENCE NUMBERS

10

first pulley

11

crankshaft

12, 12 '

planetary gear

13

freewheel

14

clutch

15

actuator

16, 16 '

sun

17, 17 '

ring gear

18, 18 '

web

19

block

20, 20 '

Platenrad

21

third pulley

22

freewheel

23

freewheel

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 1282772 B1 [0002, 0002, 0002]

Claims (10)

Internal combustion engine with belt starter generator, comprising a first pulley, which is associated with a crankshaft of the internal combustion engine, with a second pulley, which is associated with a shaft of the belt starter generator, with a belt drive, which acts on the first pulley and on the second pulley, and with a Platengetriebe which is arranged in the power flow between the crankshaft and the first pulley, characterized by a the planetary gear ( 12 ) associated freewheel ( 13 ), which when driving the first pulley ( 10 ) over the crankshaft ( 11 ) of the internal combustion engine in the generator mode of the belt starter generator closed and when driving the crankshaft ( 11 ) via the first pulley ( 10 ) is opened in motor operation of the belt starter generator, and by a the planetary gear ( 12 ), via an actuator ( 15 ) switchable coupling ( 14 ) when driving the first pulley ( 10 ) over the crankshaft ( 11 ) of the internal combustion engine in regenerative operation of the belt starter generator open and when driving the crankshaft ( 11 ) via the first pulley ( 10 ) is closed in the engine operation of the belt starter generator for starting the internal combustion engine. Internal combustion engine according to claim 1, characterized in that the crankshaft ( 11 ) on a sun bath ( 16 ) of the Platengetriebes ( 12 ) attacks that the first pulley ( 10 ) on a ring gear ( 17 ) of the Platengetriebes attacks that a bridge ( 18 ) of the Platengetriebes on the Feilauf ( 13 ) with the Sonnerad ( 16 ) of the Platengetriebes ( 12 ) and that the coupling ( 14 ) at the pier ( 18 ) of the Platengetriebes attacks, with the clutch ( 14 ) the bridge ( 18 ) of the Platengetriebes ( 12 ) to an engine block ( 19 ) of the internal combustion engine is coupled, whereas when the clutch is open ( 14 ) the bridge ( 18 ) of the Platengetriebes ( 12 ) from the engine block ( 19 ) of the internal combustion engine is decoupled. Internal combustion engine according to claim 1 or 2, characterized in that when the internal combustion engine of the freewheel ( 13 ) and the clutch ( 14 ) are opened to drive ancillaries in the motorized operation of the belt starter generator. Internal combustion engine according to claim 3, characterized in that on the first pulley ( 10 ) a third pulley ( 21 ) engages, which acts on a second belt drive to drive the ancillaries. Internal combustion engine according to claim 4, characterized in that the first pulley ( 10 ) and the third pulley ( 21 ) are arranged coaxially with each other. Internal combustion engine with belt starter generator, comprising a first pulley, which is associated with a crankshaft of the internal combustion engine, with a second pulley, which is associated with a shaft of the belt starter generator, with a belt drive, which acts on the first pulley and on the second pulley, and with a Platengetriebe which is arranged in the power flow between the crankshaft and the first pulley, characterized by a the planetary gear ( 12 ' ) associated first freewheel ( 22 ), which when driving the first pulley ( 10 ) over the crankshaft ( 11 ) of the internal combustion engine in the generator mode of the belt starter generator closed and when driving the crankshaft ( 11 ) via the first pulley ( 10 ) is opened in the motor operation of the belt starter generator, and by a the planetary gear ( 12 ' ) associated second, opposite freewheel ( 23 ), which when driving the first pulley ( 10 ) over the crankshaft ( 11 ) of the internal combustion engine in regenerative operation of the belt starter generator open and when driving the crankshaft ( 11 ) via the first pulley ( 10 ) is closed in the motor operation of the belt starter generator. Internal combustion engine according to claim 6, characterized in that the crankshaft ( 11 ) on a sun bath ( 16 ' ) of the Platengetriebes ( 12 ' ) that the first pulley over the first Feilauf ( 22 ) with the Sonnerad ( 16 ' ) of the Platengetriebes ( 12 ' ) is coupled to the first pulley via the second freewheel ( 23 ) with a ring gear ( 17 ' ) of the Platengetriebes is coupled, and that a bridge ( 18 ' ) of the Platengetriebes ( 12 ' ) on an engine block ( 19 ) of the internal combustion engine attacks. Method for operating an internal combustion engine according to one of claims 1 to 7, characterized in that the crankshaft of the stopped internal combustion engine is rotated before starting the same via the motor-driven belt starter generator in an optimal position for starting. A method according to claim 8, characterized in that this is done depending on a measured value of a particular assigned to the crankshaft position sensor. Method for operating an internal combustion engine according to one of claims 1 to 7, characterized in that a run-up of the started internal combustion engine via the motor-driven belt starter generator up to a defined limit speed of the internal combustion engine is supported.

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