DE102018106211A1 - Starting method for an internal combustion engine, internal combustion engine and motor vehicle - Google Patents

Abstract

The invention relates to a starting method (1) for operating an internal combustion engine (100) of a motor vehicle (101), the method comprising: closing a throttle device (102); Generating a negative pressure in a suction pipe section (103) between the throttle device (102) and a cylinder (104); Operating an adjustable pumping arrangement (105) acting on the suction pipe section (103), the pumping arrangement (105) comprising a valve device (106) and a pumping device (107); Separating the pumping device (107) from the suction pipe section (103) by means of the valve device (106); Starting the internal combustion engine (100); Changing an operating condition of the internal combustion engine (100) by adjusting the pumping arrangement (105). The invention further relates to a controller (109) an internal combustion engine (100) and a motor vehicle (101) for carrying out the method according to the invention.

Description

The present invention relates to a start-stop method for an internal combustion engine of a motor vehicle, an internal combustion engine and a motor vehicle.

Start-stop functionalities are now widely used in motor vehicles. During a start-stop cycle, the engine is shut down without active driver intervention (for example, at a traffic light stop) and is idle during a standby state. The standby state is terminated by operating the clutch, releasing the foot brake (in an automatic vehicle) or by operating the accelerator pedal, and starting is started.

For start-stop operation, starter generators or in particular also belt starter generators (RSG) are used, which are coupled to the actual combustion engine via a belt drive like an alternator. In addition to the starter function, such belt starter generators can also take over a booster function during startup and acceleration and, during braking in generator mode, feed part of the destroyed kinetic energy back into the power grid (recuperation).

Start-stop operation in conjunction with a belt starter generator, on the one hand, makes an important contribution to fuel economy, but on the other hand, loads the mechanical components of the drivetrain with frequent start-ups that increase the stress on the driveline. In particular, vibration damping members such as the dual mass flywheel, decoupler or torsional damper attenuate the resulting vibrations in the drive train, but may be very heavily stressed, because at each engine start the resonance speed of the drive train is through, which can lead to high loads in the dual mass flywheel and cause damage there ,

There are different approaches to reducing this problem and reducing or avoiding the resonant vibrations.

Either additional energy can be introduced into the system (see example) DE 100 35 521 B4 . DE 101 48 175 A1 . DE 10 2012 214 361 A1 ). In other solutions, the flywheel masses of the DMF are mechanically coupled (for example DE 100 05 101 A1 . DE 33 45 541 C2 . GB 2 148 455 . DE 10 2012 203 601 . DE 10 2009 016 640 . DE 10 2005 058 531 . DE 10 2011 084 142 ). Finally, there is also an approach whereby the output power of the internal combustion engine is reduced as soon as resonance threatens to occur ( EP 2 071 163 A2 ).

In all of these solutions, either additional energy and / or expensive design measures are required or there are undesirable delays (due to power reduction) during the start-stop process.

There are also other approaches that try by engine-internal measures to reduce the resulting by the compression effects during the starting phase (when "starting" the engine) vibrations.

For the start of an internal combustion engine of a motor vehicle various embodiments are known in the art.

From the German patent application DE 10 2013 016 699 A1 a starting method is known in which the initially opened throttle device is partially or completely closed during the starting phase of the internal combustion engine. As a result, the air supply to the cylinder is reduced in order to reduce the occurring compression effect at top dead center. Thus, less rotational irregularity can be achieved during startup.

Although these measures have a smoothing effect on the speed fluctuations occurring during starting, the vibration stresses nevertheless remain relatively high.

There are also approaches possible in which the negative pressure or a pressure reduction in the intake pipe is generated by a running of the engine with the throttle valve closed. In a subsequent boot process, this measure allows a further smoothing of the starting vibrations.

However, the negative pressure breaks down due to leaks after a few seconds, so that this effect is no longer usable after a long stop phase.

To solve this problem, it would be possible to provide a pump which, for example electrically driven, evacuates the intake manifold region immediately before starting. Immediately after the start, however, an operating state of the internal combustion engine is usually required, in which a high power should be available (for example when accelerating). Higher performance can be achieved either via the RSG (which can provide additional drive torque when starting up) or, for example, by mechanically coupled compressors or by electrically powered eBoosters Will be provided. However, the RSG is claimed considerably. Other units must either be mechanically coupled to the engine or require an additional drive. Under certain circumstances, power delays may also occur.

The object of the present invention is to provide a start-stop method for an internal combustion engine of a motor vehicle, a control system and a corresponding motor vehicle, which carries out such a starting method, which at least partially overcomes the above-mentioned disadvantages.

In particular, the task may also be to realize an increased engine output immediately after a low-vibration start, which should possibly also be able to be realized after prolonged standby or standstill phases.

This object is achieved by the starting method according to the invention for an internal combustion engine of a motor vehicle according to claim 1 and a motor vehicle according to claim 10.

Further advantageous embodiments of the invention will become apparent from the subclaims and the following description of preferred embodiments of the present invention.

• - Schließen einer Drosseleinrichtung;
• - Erzeugen eines Unterdrucks in einem Saugrohrabschnitt zwischen der Drosseleinrichtung und einem Zylinder;
• - Betreiben einer am Saugrohrabschnitt wirkenden, einstellbaren Pumpanordnung, wobei die Pumpanordnung eine Ventileinrichtung und eine Pumpeinrichtung umfasst;
• - Trennen der Pumpeinrichtung vom Saugrohrabschnitt mittels der Ventileinrichtung;
• - Starten des Verbrennungsmotors und
• - Ändern eines Betriebszustands des Verbrennungsmotors mittels Einstellen der Pumpanordnung.

According to a first aspect of the present invention, the starting method according to the invention for operating an internal combustion engine of a motor vehicle comprises the following:

• - closing a throttle device;
• - generating a negative pressure in a Saugrohrabschnitt between the throttle device and a cylinder;
• - Operating an acting on Saugrohrabschnitt adjustable pumping arrangement, wherein the pumping arrangement comprises a valve means and a pumping means;
• - Separating the pumping device from the Saugrohrabschnitt means of the valve means;
• - Starting the engine and
• - Changing an operating condition of the internal combustion engine by means of adjusting the pumping arrangement.

In other embodiments of the invention, the order of these steps may also be different.

According to a second aspect of the invention, this includes a control for operating an internal combustion engine of a motor vehicle during a starting process, which is designed to carry out the method according to the invention.

Another aspect relates to an internal combustion engine with a controller which is adapted to carry out the method according to the invention, and a motor vehicle with such an internal combustion engine.

The invention is characterized in that the method comprises closing the throttle device (a throttle valve assembly) before starting the internal combustion engine. In this case, the closing of the throttle device can also be used to stop the engine, i. the throttle device is already closed before or for switching off the internal combustion engine.

But it is also possible to end the internal combustion engine by interrupting the fuel supply (interrupting an injection process) or by interrupting the ignition in a gasoline engine.

After switching off, in the standby mode, it is possible first to hold a negative pressure generated during the shutdown, which is present in a suction pipe section between the throttle device and an inlet valve (of a cylinder). This is done by keeping the throttle device closed.

The negative pressure in the suction pipe section refers to an ambient pressure. This vacuum in the intake manifold acts as an energy storage that can be used to make the engine easier to start. Lighter in this context means a reduction in the compression and expansion vibrations when starting the engine. By keeping the throttle device closed, this negative pressure can be maintained over a certain period of time (for example 5 s to 10 s), depending on the tightness of the system.

With sufficient tightness and / or with large suction tube volume, this period can be extended to an indefinite length. During the subsequent starting of the internal combustion engine, the throttle valve remains closed during this starting phase up to a specific threshold speed (for example 400 revolutions per minute). During this time, the compression / compression fluctuations are relatively low due to the prevailing negative pressure in the intake manifold. As a result, the otherwise typical during starting speed oscillations are very much minimized and the load on the vibration damping components is significantly reduced. This considerably minimizes the risk of damage caused by resonance. Furthermore, the starting process itself can be shortened be because the critical speed range is reached faster at which the engine is working independently.

Conventional throttle devices or throttle valves as well as other components on the intake tract have a certain leakage, so that the negative pressure is compensated again after a certain time. To prevent this, or to rebuild a negative pressure before the start of the internal combustion engine, it is necessary to generate a negative pressure in a Saugrohrabschnitt between the throttle device and a cylinder and only then to restart the engine.

For generating the negative pressure, which has degraded again, for example, after stopping the internal combustion engine after a certain time, the operation of an acting on the Saugrohrabschnitt, adjustable pumping arrangement, which includes a valve device and a pumping device. By operating the pumping arrangement in a suction operation, the vacuum required for starting is built up in the intake pipe section. Subsequently, the pumping device is separated from the suction pipe section by means of the valve device, the internal combustion engine is started. Immediately thereafter, the operating state of the internal combustion engine can be changed by adjusting the pumping arrangement.

The pump arrangement, which can be brought into an operating state by the valve device, in which an overpressure in the suction pipe section is built up to increase the output, and thus an increased supply of fresh air can be realized. This overpressure allows a fast power increase of the internal combustion engine when starting.

The valve assembly can be designed so that the pumping device continues to operate without reversal of direction and the overpressure is only buildable with a running pump by a corresponding adjustment change of the valve device in the sense of a thrust reverser.

There are advantageous embodiments in which the generation of the negative pressure by driving the internal combustion engine by means of a starting device. In this step, existing units of the engine are used to build the required vacuum. The motor driven by the starting device serves as a vacuum pump, which generates a negative pressure in the intake manifold. The compression is minimized and it is possible to perform the desired "soft start", even if, after a stop or stop operation during a standby mode, the initially existing negative pressure has been reduced again. The method according to the invention makes it possible to carry out a soft-start after any length of standby time without requiring design changes to the throttle device or requiring the additional shut-off or sealing devices.

In an alternative method according to the invention, a negative pressure is generated by operating the pump arrangement acting on the suction pipe section. Such, for example electrically driven vacuum pump can advantageously produce or maintain the desired negative pressure, without having to move the entire engine using the RSG.

There are also methods according to the invention in which the leakage losses, which reduce the negative pressure in the suction pipe section, are compensated by driving the internal combustion engine by means of the starting device and / or by operating the pumping device acting on the suction pipe section. With this method, no negative pressure must be built up, but only the negative pressure is maintained, which was already generated when stopping the engine (with the throttle closed) by the tracking effect.

There are embodiments in which the negative pressure is detected by a pressure sensor and this emits a corresponding pressure signal to a controller which controls the driving of the starting device and / or the pumping arrangement according to the pressure signal and / or other parameters (eg driver's request, Operating state of the internal combustion engine, fresh air temperature, fresh air mass flow).

The term "setting" in this context refers to both a direct control and a feedback control. For example, it may be provided that the starting device or the pumping device is put into operation only when a certain negative pressure threshold is exceeded or fallen below.

There are embodiments in which the controller controls the starting device and / or the pumping device with a desired torque corresponding to the pressure signal.

In another method, the controller may also set a desired speed of the starting device or the pump device corresponding to the pressure signal.

Target torque and target speed are particularly easy to set operating variables in electric machines.

There are also simpler versions in which in standby mode without detection of Saugrohrdruckes a certain target torque or a specific target speed of the starting device or the pumping device is set to prevent only the reduction of negative pressure - ie only to compensate for leakage losses - or rebuild the negative pressure after regular intervals. It is possible to operate the starting device or the pumping device either continuously or at varying intervals.

In another advantageous method, changing the operating state of the internal combustion engine via a change in the operating state of the valve device is brought about. In this case, either the pump device is separated from the Saugrohrabschnitt via the valve means or the flow direction of the funded by the pumping device air is reversed. That is, the pump does not work as a vacuum pump to evacuate the Saugrohrabschnitt or there reduce the pressure, but it works as a positive pressure pump and additionally promotes air in the Saugrohrabschnitt. This means that an overpressure is built up in the suction pipe section which can serve to allow a higher output of the internal combustion engine. In this way, the pumping device itself always only needs to be conveyed in one direction, while the flow direction is determined by the valve device. It is therefore advantageously not necessary to use different pumps for evacuation and overpressure build-up. It is also not necessary to provide a pump that can deliver in two different flow directions.

Another inventive method provides that the valve device is designed as a 4/3-way valve. By means of such a valve device, the states "valve closed" (pumping device separated from the suction tube section), "valve device switched in the first flow direction" (pumping device operates as a suction pump) and "valve device connected in the second flow direction" (pumping device operates as a positive pressure pump) can be provided. Thus, the pump assembly can be used as an aggregate for low-vibration restart of the engine via simple control commands and used simultaneously or immediately after restarting as a kind of eBooster, which allows a higher boost pressure in the cylinder.

In a further method according to the invention, the signal is a simple actuating signal and / or a drive signal for the pumping arrangement. Both the control signals for the valve device and drive signals for the pumping arrangement are easy to generate control signals which allow a very universal and operating state-dependent, flexible operation of the pumping arrangement. Thus, for example, the pumping power can be influenced in a particularly simple manner via a corresponding current signal with which an electric drive of the pumping device is activated.

In a further method according to the invention, the controller for changing the operating state of the internal combustion engine actuates the pumping arrangement so that the pumping device and valve device are adjusted so that charge air is injected into the suction tube section and the controller delivers a control signal corresponding to the desired overpressure to the pumping device. This makes it possible to adapt the desired overpressure exactly to the desired operating state of the internal combustion engine. Advantageously, this overpressure can be determined either map-controlled, driver-controlled or even taking into account operating conditions of the internal combustion engine and / or its aggregates.

There are also versions in which an optional additional controllable shut-off element is optionally installed in the intake manifold in order to prevent the supply of fresh air when switching off the internal combustion engine and optionally shut off the Saugrohrabschnitt against another air supply. In such an embodiment, a better seal against the ambient air may be possible and in this way the negative pressure can be maintained for a longer period than would be possible by means of the throttle.

There are also methods in which the throttle device is at least partially open when the internal combustion engine is running in a drive state in response to a driver request. This includes the partial opening of a throttle valve or even the full opening of an optional additional shut-off device to ensure the necessary supply of fresh air during operation of the engine.

There are methods in which the starting of the internal combustion engine takes place with the throttle device closed at a negative pressure which is below a pressure threshold which is between 0.2 and 0.8 bar below an ambient pressure. In such an embodiment, restarting the engine from standby mode may be pressure controlled. If the negative pressure increases, ie the pressure difference to ambient pressure decreases and the pressure in the intake manifold increases, for example automatically controlled, when a certain pressure threshold value is reached, the engine can be restarted to be able to carry out the starting process gently, more gently than if this were the case first then happens when the pressure threshold is exceeded.

The invention further relates to a controller for operating an internal combustion engine of a motor vehicle in a starting method (eg within a start-stop cycle), which is designed to carry out the method according to the invention. These include the control of the throttle device of a starting device and optionally also the monitoring of the pressure state in the intake manifold or a standby time to restart the engine.

Furthermore, the invention relates to an internal combustion engine with a controller according to the invention, which is adapted to carry out the method according to the invention.

The invention also includes a motor vehicle with such an internal combustion engine. With this structure, it is possible to use the starting method according to the invention for a motor vehicle.

There are embodiments in which a sensor is provided for determining a position of a throttle valve of the internal combustion engine.

Alternatively or optionally, there are also embodiments in which a sensor for detecting the position of a further obturator is provided.

There are also embodiments in which a Saugrohrdrucksensor is provided which detects the intake manifold pressure between the throttle device and a cylinder. This makes it possible to carry out the start-stop method optionally suction tube pressure controlled. Another pressure sensor can also be provided in the flow direction before the throttle device.

There are versions in which the starter is designed as a belt starter generator. Belt starter generators (RSG) are versatile units that can be operated both as a motor and as a generator. At the same time they replace a conventional starter and an alternator. In engine operation, they work as starters and start the combustion engine. But you can also take over a booster function at the same time and provide power reserves as an additional electric drive. During regenerative operation, they can recuperatively feed electrical energy into the vehicle's electrical network when the vehicle is being decelerated.

There are embodiments in which the motor vehicle comprises an internal combustion engine which is designed as a diesel engine. Diesel engines operate with particularly high compression in the piston in order to realize the self-ignition of the injected fuel during operation. As a result, the vibration problems in high-compression diesel engines are particularly clear and can be reduced by the inventive start-stop method particularly effective by the pressure reduction in the intake manifold.

• 1 einen schematischen Ablauf eines Ausführungsbeispiels eines erfindungsgemäßen Startverfahrens mit optionalen Schritten;
• 2 eine schematische Darstellung einer Verbrennungsmotoranordnung zum Ausführen des erfindungsgemäßen Verfahrens,
• 3 eine weitere Verbrennungsmotoranordnung mit Alternativen zum Ausführen des erfindungsgemäßen Verfahrens und
• 4 noch eine weitere Ausführung einer Verbrennungsmotoranordnung mit weiteren Alternativen zur Ausführung des erfindungsgemäßen Verfahrens.

Embodiments of the invention will now be described by way of example and with reference to the accompanying drawings. It shows:

• 1 a schematic sequence of an embodiment of a starting method according to the invention with optional steps;
• 2 a schematic representation of an internal combustion engine arrangement for carrying out the method according to the invention,
• 3 a further internal combustion engine arrangement with alternatives for carrying out the method according to the invention and
• 4 Yet another embodiment of an internal combustion engine arrangement with further alternatives for carrying out the method according to the invention.

• (2) Schließen einer als Drosselklappenanordnung 102 ausgebildeten Drosseleinrichtung;
• (3) Erzeugen eines Unterdrucks in einem Saugrohrabschnitt 103 zwischen der Drosseleinrichtung 102 und einem Zylinder 104;
• (4) Betreiben einer am Saugrohrabschnitt 103 wirkenden, einstellbaren Pumpanordnung 105, wobei die Pumpanordnung eine insbesondere als 4/3-Wegeventil 106 ausgebildete Ventileinrichtung und eine insbesondere als elektrische Luftpumpe 107 ausgebildete Pumpeinrichtung umfasst;
• (5) Trennen der Pumpeinrichtung 107 vom Saugrohrabschnitt 103 mittels der Ventileinrichtung 106;
• (6) Starten des Verbrennungsmotors 100;
• (7) Ändern eines Betriebszustands des Verbrennungsmotors 100 mittels Einstellen der Pumpanordnung 105.

1 shows an embodiment of a starting method according to the invention 1 for operating an internal combustion engine 100 of a motor vehicle 101 (see also 2 ). The starting procedure starts with an initially stationary internal combustion engine 101 off (eg in the stand-by state of a start-stop cycle) and comprises the steps:

• (2) closing one as the throttle valve assembly 102 trained throttle device;
• (3) generating a negative pressure in a Saugrohrabschnitt 103 between the throttle device 102 and a cylinder 104 ;
• (4) operating one on the suction pipe section 103 acting, adjustable pumping arrangement 105 , wherein the pumping arrangement, in particular as a 4/3-way valve 106 trained valve device and in particular as an electric air pump 107 formed pumping device comprises;
• (5) Disconnect the pumping device 107 from the suction pipe section 103 by means of the valve device 106 ;
• (6) Starting the internal combustion engine 100 ;
• (7) Changing an operating state of the internal combustion engine 100 by adjusting the pumping arrangement 105 ,

The step ( 3 ), Generating a negative pressure in a Saugrohrabschnitt 103 , optionally or additionally the step ( 3a ) and or ( 3b ). The step ( 3a) includes the compensation of leakage losses, which is the negative pressure in Saugrohrabschnitt 103 Remove by driving the internal combustion engine 100 by means of a starting device 100a (eg a RSG), and the step ( 3b) includes leakage compensation by operating the suction pipe section 103 acting pumping device 107 ,

Further, the step comprises 3 ) Generating a negative pressure the step ( 3c) in which the negative pressure via a pressure sensor 116 is detected and this a corresponding pressure signal to a controller designed as a control unit 109 which gives off the driving of the starting device 100a and / or the pumping arrangement 105 controls in accordance with the detected pressure signal.

The term "control" in the context of the present invention is to be understood in the broadest sense as "setting", which includes both discrete settings, direct control functions and feedback control functions. It also includes different discrete switching positions of the 4/3-way valve 106 and settings of the electric air pump 107 (adjustable, for example, delivery volume and / or delivery pressure).

The step ( 7 ) Changing an operating state of the internal combustion engine 100 by adjusting the pumping arrangement 105 optionally includes the step ( 7a ), wherein changing the operating state of the internal combustion engine 100 a change of an operating state of the valve device 106 includes, and / or the step ( 7b ), where the controller 109 a the pressure signal, the operating condition of the engine 100 and / or a driver request corresponding control signal for controlling the pumping arrangement 107 generated.

2 shows a simple engine arrangement 100 in a motor vehicle 101 , which is indicated by a dashed frame. The internal combustion engine 100 includes an intake tract 110 with an intake manifold 111 sucking fresh air through an air filter 112 leads. From the air filter, the air enters a clean air line 113 , There she passes an air mass meter 114 and a throttle assembly 102 (Throttle device), through which they are in a Saugrohrabschnitt 103 and from there into one of four cylinders 104 , The throttle assembly 102 bridging is the pumping arrangement 105 provided which the electric air pump 107 and the 4/3 way valve 106 includes. The fresh air is in front of or in the cylinder 104 enriched with fuel and passes after combustion as exhaust gas through an exhaust pipe assembly 115 from the internal combustion engine 100 , A control unit 109 is over exits 116 in particular with the pumping arrangement 105 and with the electric air pump 107 and the 4/3-way valve 106 connected. In the clean air line 113 can be seen in the flow direction before and after the throttle assembly 102 sensors 116 are provided, which are designed as pressure and / or temperature sensors and also signals to the control unit 109 deliver.

The pumping arrangement 105 works as follows: Immediately before a start is the 4/3-way valve 106 switched so that there is air through a first line 117 from the suction pipe section 103 in a second line 118 , by the electric air pump 107 in a third line 119 and finally through a fourth line 120 into the clean air line 113 in front of the throttle valve assembly 102 passes. This is in Saugrohrabschnitt 103 built or maintained a negative pressure.

To start the internal combustion engine 100 , can the wires 117 . 118 . 119 and 120 be separated and closed.

After starting the engine, the 4/3-way valve 106 If necessary, switched so that the pump 107 through the fourth line 120 and the second line 118 Air through the electric air pump 107 in the third line 119 and through the 4/3-way valve 106 over the first line 117 in the suction pipe section 103 leads, where the additional air supply increases the boost pressure and thus the performance of the engine can be increased.

In a third operating state, the 4/3-way valve is closed and there is no connection between the Saugrohrabschnitt 103 after the throttle valve assembly 102 and the clean air line 113 in front of the throttle valve assembly. The electric air pump 107 is shut down in this operating condition.

The control or regulation of the pump arrangement 105 with its 4/3-way valve 106 and the electric air pump 107 via the control unit 109 , the appropriate control signals to the 4/3-way valve 106 or the electric air pump 107 emits. The control signals are due to the sensors 116 , the air mass meter 114 as well as due to a present or a desired (driver request) operating state of the internal combustion engine 100 issued. Suitable control signals can be calculated, map-controlled and / or other suitable manner in the control unit 109 be generated or retrieved.

3 shows an internal combustion engine 100 in a motor vehicle 101 in which additionally a turbocharger unit driven by the exhaust gas flow 121 is provided as well as a charge air cooler 122 , the fresh air side between the turbocharger unit 121 and the throttle assembly 102 is arranged.

3 shows two alternative arrangements of the pumping arrangement 105 , In the first variant, the pump assembly connects 105 the fresh air line 113 in front of the turbocharger unit 121 over the fourth line 120 and the first line 117 with the suction pipe section 103 , The pump assembly thus promotes the generation of negative pressure air from the Saugrohrabschnitt 103 in front of the turbocharger unit 121 arranged clean air line 113 , In the alternative embodiment, the pumping assembly connects 105 in the context of 2 described in detail way the Saugrohrabschnitt 103 with the clean air line 113 immediately before the throttle valve assembly 102 ,

The operation of the pumping arrangement otherwise takes place in the same way as in connection with 2 described.

5 shows two further embodiments in connection with an internal combustion engine 100 , in addition to the turbocharger unit 120 a compressor unit 123 includes. The compressor unit 123 includes a compressor 124 which is either mechanical with the crankshaft of the internal combustion engine 100 is connected or is electrically driven, for example, and is designed as a so-called eBooster. The over the compressor unit 123 additional air volume is on the one hand by the compressor 124 itself and an additional control flap 125 controlled or regulated.

In one embodiment, the pump assembly connects 105 the input side of the compressor unit 123 over the fourth line 120 and the first line 117 with the suction pipe section 103 after the throttle valve assembly 102 ,

In the alternative embodiment, the fourth line connects 120 the clean air line area 113 after the compressor unit 123 over the first line 117 with the suction pipe section 103 after the throttle valve assembly 102 , Again, the operation of the pumping arrangement takes place 105 analogous to the embodiments described above.

LIST OF REFERENCE NUMBERS

1

start process

2

Close a throttle device

3

Generating a negative pressure

4

Operating the adjustable pumping arrangement

5

Disconnect the pumping device

6

Starting the internal combustion engine

7

Change an operating condition of the internal combustion engine

100

internal combustion engine

100a

Starting Device (RSG)

101

motor vehicle

102

Throttle valve assembly, throttle device

103

suction pipe

104

cylinder

105

pump assembly

106

4/3-way valve, valve device

107

electric air pump, pumping device

109

control unit

110

intake system

111

intake

112

air filter

113

Clean air duct

114

Air flow sensor

115

Exhaust pipe arrangement

116

sensor

117

first line

118

second line

119

third line

120

fourth line

121

turbocharger unit

122

Intercooler

123

compressor unit

124

Compressor / eBooster

125

control flap

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

• DE 10035521 B4 [0006]
• DE 10148175 A1 [0006]
• DE 102012214361 A1 [0006]
• DE 10005101 A1 [0006]
• DE 3345541 C2 [0006]
• GB 2148455 [0006]
• DE 102012203601 [0006]
• DE 102009016640 [0006]
• DE 102005058531 [0006]
• DE 102011084142 [0006]
• EP 2071163 A2 [0006]
• DE 102013016699 A1 [0010]

Claims (12)

A starting method (1) for operating an internal combustion engine (100) of a motor vehicle (101), the method comprising: Closing a throttle device (102); Generating a negative pressure in a suction pipe section (103) between the throttle device (102) and a cylinder (104); Operating an adjustable pumping arrangement (105) acting on the suction pipe section (103), wherein the pumping arrangement (105) comprises a valve device (106) and a pumping device (107) Separating the pumping device (107) from the suction pipe section (103) by means of the valve device (106); Starting the internal combustion engine (100); Changing an operating condition of the internal combustion engine (100) by adjusting the pumping arrangement (105). Starting method (1) according to one of the preceding claims, wherein leakage losses, which reduce the negative pressure in the suction pipe section (103), by driving the internal combustion engine (100) by means of a starting device (100a) and / or by operating the Saugrohrabschnitt (103) acting pumping device ( 107). Starting method (1) according to any one of the preceding claims, wherein the negative pressure via a pressure sensor (116) is detected and this outputs a corresponding pressure signal to a controller (109), which drives the starting device (100a) and / or the pumping arrangement (105) controls according to the pressure signal. The starting method (1) according to any one of the preceding claims, wherein changing the operating state of the internal combustion engine (100) comprises changing an operating state of the valve device (106). Starting procedure (1) after Claim 4 wherein the controller (109) generates a control signal corresponding to the pressure signal and / or the operating state of the internal combustion engine (100) for controlling the pumping arrangement (105). Starting method (1) according to one of the preceding claims, wherein the valve device (106) comprises a 4/3-way valve and the pumping device (107) comprises an electric air pump. Starting procedure (1) after Claim 6 wherein the control signal comprises an actuating signal for the valve device (106) and / or a drive signal for the pumping device (107). Starting procedure (1) after Claim 5 wherein the controller (109) for changing the operating state of the internal combustion engine (100) controls the pumping arrangement (105) so that pumping means (107) and valve means (106) are adjusted so that charge air is injected into the suction pipe section (103) and the controller (109) delivers a control signal corresponding to the desired overpressure to the pump arrangement (105). A controller (109) for operating an internal combustion engine (100) when starting a motor vehicle (101), which is designed to start a method (1) according to any one of Claims 1 to 8th perform. Internal combustion engine (100) with a control according to Claim 9 , Motor vehicle (101) comprising an internal combustion engine (100) according to Claim 10 , Motor vehicle (101) according to Claim 10 , further comprising an intake manifold pressure sensor (116) for detecting intake manifold pressure applied between the throttle device (102) and a cylinder (104).

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