EP2815089A1 - Dispositif de dégazage de carter de vilebrequin - Google Patents

Dispositif de dégazage de carter de vilebrequin

Info

Publication number
EP2815089A1
EP2815089A1 EP13707299.7A EP13707299A EP2815089A1 EP 2815089 A1 EP2815089 A1 EP 2815089A1 EP 13707299 A EP13707299 A EP 13707299A EP 2815089 A1 EP2815089 A1 EP 2815089A1
Authority
EP
European Patent Office
Prior art keywords
crankcase
line
gas
conveyor
blow
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP13707299.7A
Other languages
German (de)
English (en)
Other versions
EP2815089B1 (fr
Inventor
Dimitri An
Sebastian BARTHELMESS
Leszek Goerlich
Corinna KRAMPE
Niklas Kull
Yakup ÖZKAYA
Frank Rohde
Stefan Ruppel
Hartmut Sauter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mahle International GmbH
Original Assignee
Mahle International GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from DE201210202405 external-priority patent/DE102012202405A1/de
Priority claimed from DE201210220800 external-priority patent/DE102012220800A1/de
Application filed by Mahle International GmbH filed Critical Mahle International GmbH
Publication of EP2815089A1 publication Critical patent/EP2815089A1/fr
Application granted granted Critical
Publication of EP2815089B1 publication Critical patent/EP2815089B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M13/00—Crankcase ventilating or breathing
    • F01M13/04—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M13/00—Crankcase ventilating or breathing
    • F01M13/02—Crankcase ventilating or breathing by means of additional source of positive or negative pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M13/00—Crankcase ventilating or breathing
    • F01M13/04—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
    • F01M2013/0422—Separating oil and gas with a centrifuge device

Definitions

  • the present invention relates to a vehicle, preferably a road vehicle.
  • crankcase In the crankcase is a crankshaft, which is connected via connecting rods with pistons of the individual cylinders of the internal combustion engine. Leakages between the pistons and the associated cylinder walls result in a blow-by gas flow through which blow-by gas passes from the combustion chambers into the crankcase.
  • crankcase ventilation device To avoid undue overpressure in the crankcase modern engines are equipped with a crankcase ventilation device to dissipate the blow-by gases from the crankcase.
  • the blow-by gas is usually supplied to a fresh air system of the internal combustion engine using the crankcase ventilation device, which supplies the combustion chambers of the internal combustion engine with fresh air.
  • the crankcase ventilation device In the crankcase there is an oil mist, so that the blow-by-gas carries oil with it.
  • a crankcase ventilation device usually has an oil separation device and preferably an oil return, which returns the separated oil to the crankcase.
  • passive systems can basically be distinguished from active systems. Passive systems use the pressure difference between the crankcase and the negative pressure in the fresh air system to drive the blow-by gas.
  • the negative pressure in the fresh air system varies greatly depending on the operating condition of the Internal combustion engine. In this case, operating conditions may occur in which the available pressure difference is insufficient to dissipate enough blow-by gas.
  • each oil separation device has a flow resistance for the blow-by gas, which makes it difficult to discharge blow-by gas.
  • active systems operate with a conveyor for driving the blow-by gas, so that always sufficient pressure difference can be provided to dissipate the required amount of blow-by gas from the crankcase. Also, in an active system, the flow resistance of the respective oil separator can be easily overcome. In active systems, however, the installation cost due to the separate conveyor is disadvantageous because a separate conveyor is associated with correspondingly high costs.
  • Oil separators work on different principles. Inertial separators are known, such as cyclone separators, impactors and centrifugal separators, as well as filter devices and electrostatic precipitators.
  • a crankcase ventilation device which operates with an oil separator designed as an impeller, is known, for example, from WO 2009/080492 A2.
  • the present invention is concerned with the problem of providing for a vehicle of the type mentioned an improved embodiment, which is characterized in particular by an inexpensive feasibility. At the same time, a high efficiency with regard to the oil separation effect should be realized.
  • the invention is based on the general idea of basically configuring the crankcase ventilation device as an active system, wherein an already existing on the vehicle conveyor is used to drive the blow-by gas, ie a conveyor on the vehicle by a blow-by gas drives different fluid.
  • an active system can be realized without having to provide a separate, additional conveyor on the vehicle.
  • the already existing conveyor receives a double function.
  • no additional space for accommodating an additional conveyor is required because only a suitable fluidic interconnection must be provided, which manages with comparatively little space.
  • the crankcase ventilation device expediently has a suction line, which connects the crankcase with a suction side of the conveyor according to an advantageous embodiment. In this way, the blow-by gas is driven or sucked in by a negative pressure generated by the delivery device on its suction side.
  • a pressure line of the crankcase ventilation device connect a pressure side of the conveyor with the crankcase or with a fresh air system of the internal combustion engine.
  • the conveyor thus promotes the sucked blow-by gas either back to the crankcase or the fresh air system, whereby the blow-by gas is supplied together with the fresh air combustion in the internal combustion engine.
  • the crankcase ventilation device in another advantageous embodiment, be equipped with a control device that allows a dependent on the current pressure in the fresh air in the region of the connection with the suction line control of a switching valve for controlling the connection between the suction line and conveyor.
  • the suction of blow-by gas by means of the conveyor is activated in the simplest case only if an intake by the negative pressure in the fresh air line is not sufficient for this purpose.
  • the conveyor need not be permanently used to drive the blow-by gas.
  • the crankcase ventilation device can be switched depending on demand between a passive operation and an active operation.
  • this can be provided a fluidically connecting the crankcase with the fresh air system vent line.
  • the vent line in addition to the above ⁇ labscheide worn or alternatively arranged such ⁇ labscheide styles.
  • the blow-by gas can in principle pass from the crankcase via the suction line connecting the crankcase to the suction side of the conveyor and via the vent line connecting the crankcase to the fresh air system, in both cases separating the contained oil by means of the respective associated ⁇ labscheide styles takes place.
  • the vehicle is configured such that the blow-by gas can pass through the suction line or via the vent line from the crankcase, whereby combined variants are conceivable.
  • a control member or switching valve such as a valve and the like, which regulates the suction of the blow-by gas by means of the conveyor or the flow of the blow-by gas via the vent line, wherein the control members or switching valves advantageously communicate with a controller and are controlled by this.
  • the vent can be actively activated via the suction line. tion or by means of the conveyor, for example, if the pressure difference of the blow-by gas in the crankcase and in the fresh air system of the internal combustion engine is insufficient for passive ventilation.
  • the active venting can be reduced or deactivated by means of the suction line or the conveyor if said pressure difference is sufficient to operate the vent passive.
  • pressure measuring devices such as sensors, etc., determine the pressure conditions at the appropriate locations and provide the control available.
  • control members or switching valves also possible to choose any mixture of active and passive venting.
  • a pressure control valve is provided which is arranged after a Olnebelabscheide Rhein the crankcase ventilation.
  • the crankcase internal pressure can be kept almost constant.
  • the larger the gas mass present in the crankcase the greater the volume flow emerging from the crankcase.
  • This volume flow can be fed directly or indirectly into the fresh air system.
  • the conveyor initiates an additional delivery volume flow into the crankcase.
  • another volume of gas is present in the crankcase.
  • this is discharged together with the blow-by gas from the crankcase.
  • the volume flow which is additionally introduced into the crankcase by the conveying device can be disposed of together with the usually arising blow-by gas via the fresh air system.
  • branches off between the pressure control valve and the Olnebelabscheide issued from a suction line, which is directly or indirectly connected to the crankcase.
  • the exiting from the crankcase flow is divided into two streams. A first part is about the suction re-supplied to the crankcase and thus cleaned again. A second part is fed into the fresh air system.
  • the ⁇ labscheideein- device can be arranged in the pressure line. This makes it possible, in particular, also to deposit oil particles, which are added to the blow-by gas flow in the region of the conveyor.
  • a bypass line for bypassing the ⁇ labscheide which connects the pressure line between the conveyor and the ⁇ labscheide coupled with the crankcase and which contains a pressure control valve.
  • the bypass allows relief, so that for safety reasons, the oil separator can be bypassed. As the bypass leads to the crankcase, no oil was able to escape into the environment.
  • the conveyor may drive the fluid other than the blow-by gas in a main flow while driving the blow-by gas in a bypass flow, which may in particular be throttled.
  • the main function of the conveyor remains the drive of the different from the blow-by gas fluid, as compared to only a relatively small amount of blow-by gas must be driven.
  • the oil separation device is designed as an impactor or has at least one such impactor.
  • An impactor is distinguished from other separators by an extremely simple structure, which manages without moving parts. Furthermore, an impactor is virtually maintenance free. Since a conveyor is used, the blow-by gas flow can be optimally dimensioned for an impactor, whereby a sufficiently high separation efficiency can be realized.
  • the impactor may in particular be a high-pressure impactor.
  • the respective oil separation device can have an oil tank or oil collector in which the oil separated from the blow-by gas can be collected.
  • the oil thus collected can then flow continuously or in the presence of favorable pressure conditions, in particular by means of the oil return, to the crankcase.
  • the crankcase ventilation device may comprise an injector pump, which may also be referred to as a suction jet pump.
  • an injector pump has a working fluid inlet, a suction fluid inlet, and a mixture outlet.
  • the fluid driving the injector pump is the working fluid, it enters the working fluid inlet and the mixture outlet.
  • the working fluid is usually passed through a nozzle, preferably a Laval nozzle, to generate a negative pressure in the working fluid flow. This negative pressure is connected to the Saugfluideingang over which any fluid is sucked and mixed with the working fluid, so that the sucked fluid enters the suction fluid inlet and also exits at the mixture outlet together with the working fluid.
  • Such an injector pump thus operates with fluid dynamic forces and does not require any external mechanical drive, such as a motor, belt drive or the like.
  • the working fluid inlet can now be connected to the pressure side of the delivery device via a supply line, while the suction fluid inlet is connected to the crankcase via a suction line.
  • the mixture outlet is then suitably connected via a return line to the crankcase or to the fresh air system of the internal combustion engine.
  • the different from the blow-by gas fluid at least in the extent of a partial flow, for sucking the blow-by gas, in which case the mixture of the blow-by gas and the blow-by gas different fluid, which is preferably a gas, the crankcase or the fresh air system is supplied.
  • the current required for driving the blow-by gas or partial flow of the different from the blow-by gas fluid is thus treated downstream of the injector as the blow-by gas itself.
  • the oil separation device is preferably arranged upstream of the suction fluid inlet of the injector pump. This has the advantage that the oil has already been separated from the blow-by gas reaching the injector pump. In addition, possibly passing through the ⁇ labscheide Spur passing oil or oil droplets can be reduced by means of the Injektorpumpe and in particular atomized, so that the influences of the oil downstream of the injector be reduced. However, it is also possible to arrange the ⁇ labscheide worn downstream of the mixture output of the Injektorpumpe.
  • the fluid other than the blow-by gas is a gas, in particular air. This simplifies the return of a mixture of said gas and blow-by gas to the crankcase and the fresh air system.
  • a circulation conveyor may be provided in the vent line or in the suction line, which serves for the circulation of the blow-by gas between the crankcase and the oil separator arranged downstream of the circulation conveyor.
  • the ⁇ labscheide worn is additionally fluidly connected by means of a different connection from the vent line connection with the crankcase, the latter line may be in particular the oil return.
  • This serves in particular the purpose of allowing the return of the oil collected in the oil reservoir of the oil separator to the crankcase pressure-dependent.
  • the collected oil may return to the crankcase when the pressure in the blow-by gas in the crankcase is less than the pressure downstream of the oil separator.
  • the conveyor may be part of a pneumatic brake system of the vehicle.
  • a pneumatic brake system works with pneumatic pressure to drive brake cylinders.
  • This pneumatic pressure is usually provided by means of a pneumatic conveyor.
  • a pneumatic brake system expediently works with at least one pressure accumulator.
  • the conveyor can be used to drive blow-by gas. It is also conceivable to connect the pressure line to the pressure accumulator.
  • the conveyor may be part of a compressed air system of the vehicle. In modern vehicles, especially in commercial vehicles, all kinds of systems can be operated with compressed air, such as pneumatic struts.
  • the conveyor may be part of a vacuum system of the vehicle.
  • a vacuum pump of a brake booster of the vehicle which may be designed in particular as a load vehicle or a commercial vehicle.
  • a compressed air system of the vehicle may also be provided in the supply devices of the internal combustion engine.
  • the conveyor is an exhaust gas turbocharger of the internal combustion engine.
  • the exhaust gas turbocharger is driven by the exhaust gas of the internal combustion engine and compresses the air in the fresh air system by means of a compressor.
  • the pressure side of the conveyor thus corresponds to the compressor side of the exhaust gas turbocharger, wherein the corresponding connection with the pressure side in this case can take place via the fresh air system, because the compressor is usually arranged in the fresh air system.
  • the fluid other than the blow-by gas is the air to be supplied to the internal combustion engine.
  • the gas other than the blow-by gas may also contain impurities, for example in the form of oil droplets. These contaminants are separated from the volumetric flow by the oil separator of the crankcase breather. Only the impurities which are released by the oil passing fog separator, are added to the fresh air. So a reduced pollutant emissions is realized. Furthermore, the volume flow containing the impurities is not discharged uncontrollably into the environment.
  • the conveyor may be a component of a tank ventilation device of the vehicle.
  • tank ventilation devices can be used, which can in principle be equipped with a conveyor, for example, to be able to check the tightness of the ventilation system or the fuel tank as part of a diagnosis can.
  • the conveyor may be part of a diagnostic device of the fuel tank and in particular be designed as a diagnostic pump.
  • the diagnostic device is a diagnosis, in particular the tightness of the fuel tank of the vehicle, such as a pressure diagnosis and the like.
  • the conveyor can thus be part of such a pressure system or vacuum system.
  • the conveyor may be part of a diagnostic device of the crankcase ventilation system or the crankcase ventilation device, wherein the diagnostic pump introduces a test pressure into the crankcase ventilation device, in particular in lines of the crankcase ventilation device, and over the pressure curve within the crankcase ventilation device, the tightness of the crankcase ventilation device is checked.
  • the test pressure can therefore be an overpressure or a negative pressure.
  • FIG. 1 -9 are each a greatly simplified schematic diagram of a motor vehicle with internal combustion engine and crankcase ventilation device, in various embodiments.
  • a motor vehicle 1 which is preferably a road vehicle, comprises an internal combustion engine 2 configured as a piston engine, a fresh air system 3, an exhaust system 4 and a crankcase ventilation device 5.
  • the vehicle 1 is shown in the figures 1 -9 greatly simplified and shown only in the area of the crankcase ventilation device 5.
  • the internal combustion engine 2 comprises a crankcase 6, in which a crankshaft 7 is arranged, which is connected via at least one connecting rod 8 with at least one piston 9, which is arranged to be adjustable in stroke in an associated cylinder 10 of the internal combustion engine 2.
  • the respective cylinder 10 encloses a combustion chamber 11.
  • Associated gas exchange valves, namely at least one inlet valve 12 and at least one outlet valve 13 are accommodated in a cylinder head 14. According to an arrow 15, during the operation of the internal combustion engine 2, blow-by gas can pass from the respective combustion chamber 1 1 past the respective piston 9 into the crankcase 6. Likewise, the blow-by gas can pass through internal paths into the cylinder head 14.
  • the fresh air system 3 is used to supply the combustion chambers 1 1 with fresh air, which is sucked for this purpose from an environment 16.
  • the fresh air system 3 contains in the usual way an air filter 17, an air mass measuring device 18 and a throttle valve 19.
  • the exhaust system 4 leads combustion exhaust gases from the combustion chambers 1 1 away and by at least one exhaust treatment device 20 in the direction of environment 16.
  • an exhaust gas recirculation 21 may be provided which returns a portion of the combustion exhaust gases from the exhaust system 4 to the fresh air system 3.
  • the exhaust gas recirculation 21 expediently contains an exhaust gas recirculation cooler 22, which may be connected to a cooling circuit of the internal combustion engine 2.
  • the crankcase ventilation device 5 comprises at least one oil separator 23, with the help of which oil entrained in the blow-by gas can be separated from the blowby gas stream and returned to the crankcase 6 or a sump 25 via an oil return 24.
  • the vehicle 1 is also equipped with a conveyor 26, which serves in the vehicle 1 for driving a different from blow-by gas fluid. This conveyor 26 is now used in addition to driving the blow-by gas within the crankcase ventilation device 5.
  • the respective conveyor 26 is expediently equipped with its own drive motor 27, which is preferably an electric motor and can be controlled independently of the operation of the internal combustion engine 2. In principle, however, a mechanical drive coupling between the internal combustion engine 2 and the conveyor 26 is conceivable, for example via a belt drive.
  • the conveyor 26 may be a pump which generates an overpressure and / or underpressure.
  • the conveyor 26 may thus be, for example, an already existing in the vehicle 1 vacuum pump.
  • Such a vacuum pump may in particular serve the brake booster of the vehicle 1 or be part of a brake booster of the vehicle 1.
  • the crankcase ventilation device 5 has in the embodiments of Figures 1, 2, 4, 7, 8 and 9, a pressure line 28 which connects a pressure side of the conveyor 26 with the crankcase 6.
  • the delivery device 26 is connected directly to the crankcase 6 on the pressure side.
  • the crankcase ventilation device 5 is equipped with an injector pump 29.
  • This comprises a working fluid inlet 30, a suction fluid inlet 31 and a mixture outlet 32.
  • the injector pump 29 is integrated in the pressure line 28 in such a way that the pressure line 28 from the working fluid inlet 30 to the mixture outlet 32 through the injector gate pump 29 passes.
  • the suction fluid inlet 31 is connected via a suction line 33 to the crankcase 6 or to the cylinder head 14.
  • the suction fluid inlet 31 may be connected via a suction line 34 to a vent line 35 of the crankcase ventilation device 5, which expediently downstream of the throttle valve 19 leads from the crankcase 6 to the fresh air system 3.
  • the suction fluid inlet 31 is also connected via the suction line 34 indirectly via a portion of the vent line 35 to the crankcase 6.
  • the section 36 of the pressure line 28 which leads back from the mixture outlet 32 to the crankcase 6 can also be referred to as the return line 36.
  • a switching valve 38 is installed in the section 37 of the pressure line 28 leading from the conveyor 26 to the working fluid inlet 30, which can be controlled via a corresponding control, not shown here.
  • the leading from the conveyor 26 to the working fluid inlet 30 section 37 of the pressure line 28 may also be referred to as supply line 37.
  • the Olabscheide worn 23 is preferably disposed in the vent line 35, wherein the suction line 34 is suitably connected downstream of the Olabscheide owned 23 to the vent line 35. Downstream of this junction designated 39, the vent line 35 may suitably contain a pressure control valve 40.
  • the injector pump 29 is deactivated, which can be achieved, for example, by blocking the section 37 of the pressure line 28, ie the supply line 37, the negative pressure prevailing in the fresh air system 3 downstream of the throttle valve 19 can be used to blow-by the gases from the crankcase 6 to suck.
  • connection area between the extraction line 35 and Fresh air system 3 insufficient negative pressure is available to achieve a satisfactory extraction of blow-by gas.
  • the switching valve 38 is then actuated via the aforementioned control in order to activate the injector pump 29, so that it is possible to suck off via this blow-by gas.
  • the pressure control valve 40 is located between the junction 39 and the vent line 35 connected to the fresh air system 3. With increasing, exiting from the Olabscheide issued 23 volume flow, a larger volume flow is fed into the fresh air system 3. Thus, the crankcase internal pressure remains constant. Thus, in addition to the usually incurred blow-by gas and the promoted by the injector pump 29 into the crankcase gas cleaned and fed to the fresh air system 3. The guided via the suction line 34 in a circle gas volume is returned.
  • such an oil separation device 23 may additionally or alternatively be arranged in the suction line 33 or 34.
  • the oil separation device 23 may be a centrifuge or a cyclone or a filter or else an impactor.
  • the conveying device 26 is a component of a compressed air system 42 of the vehicle 1.
  • the vehicle 1 is equipped with a pneumatic brake system or with a pneumatic suspension device or with other systems that are operated with pneumatics.
  • a compressed air system 42 downstream of the conveyor 26 may have a compressed air tank 43.
  • an air filter 44 is usually arranged.
  • the conveyor 26 may suck in air from the environment 16 and after the tank 43 the designated, not shown consumers according to an arrow 50 perform.
  • Such compressed air consumers are for example air brakes, pneumatic springs or other compressed air units.
  • the respective suction line 33, 34 may include a throttle 45. If the respective suction line 33, 34 also has an oil separation device 23, the throttle 45 is expediently arranged upstream of the separation device 23. In principle, the throttle 45 can also be arranged downstream of the oil separation device 23.
  • Figures 2 and 4 each show a variant in which the throttle body 45 is disposed downstream of the Olabscheide worn 23 in the pressure line 28.
  • the throttle device 45 is structurally integrated into the oil separation device 23, upstream or downstream of the internal separation means, which are preferably again an impactor.
  • the oil separation device 23 is again arranged in the ventilation line 35, namely upstream of the Closing point 39, via which the suction line 34 is connected to the vent line 35.
  • a throttle point 45 is arranged in the suction line 34 in order to limit the volume flow of blow-by gas to a predetermined value.
  • a bypass or a bypass line 46 can be seen, which allows a bypass of arranged in the pressure line 28 ⁇ labscheide worn 23.
  • the pressure line 28 is connected via the connection point 41 to the fresh air system 3.
  • a vent line 35 as provided in the variants of Figures 1 -3, is absent in the embodiment shown in Figure 4.
  • the suction line 34 is connected directly to the crankcase 6 and may contain an oil separator 23, which may be provided in addition to or alternatively to the disposed in the pressure line 28 ⁇ labscheide issued 23.
  • a pressure control valve 47 is expediently arranged, which is designed here as a spring-loaded check valve.
  • the respective conveying device 26 is connected on the suction side via a corresponding connecting line 48 to the respective system to which the conveying device 26 is assigned.
  • This may be, for example, a tank ventilation device 49, with the aid of which a fuel tank 61, as shown for example in FIGS. 7 and 9, can be vented.
  • 26 vaporous hydrocarbons can be aspirated from the fuel tank 61 via the conveyor 26 and perform the combustion in the combustion chambers 1 1 via the crankcase ventilation device 5 and ultimately via the fresh air system 3.
  • the interconnection of the conveyor 26 is expediently carried out in such a way that it drives the fluid other than the blow-by gas, for example air or hydrocarbon-containing air, in a main flow while it drives the blow-by gas in a secondary flow, wherein this Side stream, as shown for example in Figures 2 and 3, preferably throttled.
  • the main flow is at least twice as large as the sidestream.
  • the conveying device 26 supplies the fluid other than the blow-by gas at least to the extent of a partial flow of the oil separation device 23, which is arranged in the pressure line 28 for this purpose.
  • impurities contained in the fluid other than the blow-by gas which originate, for example, from the delivery device 26.
  • the conveyor 26 is formed by an exhaust gas turbocharger 51 of the internal combustion engine 2, which is arranged with its turbine 52 upstream of the exhaust gas treatment device 20 in the exhaust system 4 and with its compressor 53 upstream of the throttle valve 19 in the fresh air system 3 is.
  • a charge air cooler 54 is arranged in the fresh air system 3 downstream of the compressor 53 and upstream of the throttle valve 19 in order to cool the air compressed by the compressor 53.
  • the turbine 52 and the compressor 53 are drivingly connected to each other by means of a shaft 55, so that the turbine 52 driven by the exhaust gas of the internal combustion engine 2 drives the compressor 53 compressing the air in the fresh air system 3.
  • the portion of the fresh air system 3 between the compressor 53 and the throttle 19 of the pressure line 28 is further provided such injector 29, whose working fluid inlet 30 is connected by means of the supply line 37 downstream of the charging radiator 54 and upstream of the throttle valve 19 fluidly connected to the fresh air system 3 ,
  • the injector pump 29 is determined by the denser 53 compressed air of the fresh air system 3 driven.
  • the suction line 33 connects the suction fluid inlet 31 of the injector pump 31 with the crankcase 6, while the mixture outlet 32 of the injector pump 31 is fluidically connected to the fresh air system 3 via the vent line 35 'at the connection region 41.
  • a second vent line 35 "opens upstream of the connection area 41 in the first vent line 35 'to the common vent line 35.
  • the blow-by gas from the crankcase 6 can pass both actively by means of the injector pump 29 and the conveyor 26 via the suction line 33 as well as passively via the second vent line 35 "In the latter case, however, there is a sufficient pressure difference between the connection area 41 and the crankcase 6. Accordingly, the active venting can be used only when such a pressure difference is not or not sufficiently present.
  • This is provided in the supply line 37 and in the second vent line 35 "downstream of the oil separator 23 each such a control member 38th provided in the form of a switching valve 38, wherein alternatively or additionally pressure control valves 40 may be provided.
  • the switching valve 38 arranged in the second vent line 35 " it is likewise possible to arrange it upstream of the oil separator device 23.
  • switching valves 38 are connected to said controller or to a control unit other controller 58 communicatively connected, for example by means of cable 59, wherein the controller 58 can individually control the respective switching valve 38 to change any between the active and passive venting or a mixture thereof.
  • the control of the switching valves 38 is dependent on the said pressure conditions.
  • the use of the exhaust gas turbocharger 51 as a conveyor 26 has the particular advantage that with increasing loading load of the exhaust gas turbocharger 51, a larger amount of blow-by gas is generated because the cylinder 10 is subjected to higher pressure. At the same time, a greater power of the injector pump 29 is achieved at full load, so that an adapted ventilation of the crankcase 6 takes place. Accordingly, the volume flow of the blow-by gas decreases with reduced load, which also means a reduced line of the injector 29. Thus, the venting of the crankcase 6 is almost automatically adapted to the flow rate of the generated blow-by gas. Furthermore, for a sufficient drive of the injector pump 29, a comparatively small diversion of the charge air compressed by the exhaust gas turbocharger 51, in particular the charge air power, of approximately 5% is necessary.
  • FIG. 6 shows a further embodiment in which such an oil separation device 23 with such an oil container 56 is provided in the suction line 33. Upstream of the oil separator 23 there is further arranged a circulation conveyor 57 which delivers the blow-by gas from the crankcase 6 to the oil separator 23 where the contained oil is at least partially separated. Subsequently, part of the blow-by gas can flow via the oil return 24 back to the crankcase 6, so that a circulation of the blow-by gas is achieved.
  • an overpressure control valve 47 is arranged in the oil return 24, which prevents the backflow of the blow-by gas or the separated oil, in particular, when the pressure in the oil separation
  • the flow of the oil from the Olabscheide overlooked 23 and the oil reservoir 56 takes place in particular when the pressure downstream of the Olabscheide disabilities 23 is higher than the pressure in the crankcase 6.
  • the pressure downstream of the Olabscheide worn 23 can For example, be determined by the performance of the injector 29, in particular the suction at the Saugfluideingang 31.
  • the pressure is downstream Olabscheide worn 23 determined in particular by the pressure in the region of the connection point 41.
  • a control member 38 is provided in the form of a switching valve 38 to vary the volume flow of the blow-by gas conveyed by the circulation means 47 and in particular to limit.
  • the switching valve 47 is communicatively connected to said controller 58 or other control.
  • FIG. 7 shows a further embodiment in which the conveyor 26 is part of a diagnostic device 60 for diagnosing or checking the tightness of a fuel tank 61 of the vehicle 1.
  • the diagnostic device 60 has a first diagnostic line 62 which opens into the pressure line 28 downstream of the conveyor 26 and a second diagnostic line 63 which opens into the suction line 34 upstream of the conveyor 26 and a third diagnostic line 64 which is fluidically connected to the fuel tank 61.
  • the first diagnostic line 62, the second diagnostic line 63 and the third diagnostic line 64 are interconnected by means of a control member 38 and the control valve 38, the diagnostic lines 62, 63, 64 each with each other or all connect or vary these compounds and in particular can interrupt. Accordingly, the respective connection or the corresponding flow can also be throttled.
  • the diagnosis of the fuel tank is preferably carried out in a state of low load or at a standstill of the internal combustion engine 2, in which relatively little or no blow-by gas is produced or obtained, wherein in the conveyor 26 promotes at least partial load in any case.
  • the control valve 38 is actuated such that only the first diagnostic line 62 is connected to the third diagnostic line 64.
  • an overpressure can be generated, which serves as a test pressure.
  • the control valve 38 interrupts the connections between the diagnostic lines 62, 63, 64 in order to keep the overpressure in the fuel tank 61 stable.
  • a pressure monitoring is now carried out in the third diagnosis line 64 or in the fuel tank 61.
  • the pressure measuring device 65 is in the present case connected to the third diagnostic line 64.
  • the pressure measuring device 65 may alternatively or additionally also be connected directly to the fuel tank 61 or arranged in the fuel tank 61. If the pressure determined by the pressure measuring device 65 does not change, or does not change substantially or only in an anticipated range, for example due to fuel consumption, then corresponding leaks can be ruled out. A change in pressure and in particular a pressure drop, for example above the expected range, however, indicates one or more leaks.
  • the control valve 38 can be actuated such that a venting of the fuel tank takes place or is continued.
  • the tank ventilation device 49 is thus part of the diagnostic device 60 or vice versa.
  • FIG. 8 Analogous to the embodiment shown in FIG. 7, another embodiment is shown in FIG. 8, in which the diagnostic device 60 is used to diagnose the leakage or the detection of leaks in the crankcase ventilation device 5, in particular in the lines 34, 28, the oil separation device 23 and / or the pressure control valve 40, is used.
  • the conveyor 26 introduces a different from the blow-by gas fluid in the crankcase ventilation device 5 and provides in the crankcase ventilation device 5, in particular in the suction line 34 and / or the vent line 35, for an overpressure.
  • the conveyor 26 may also generate a negative pressure in the conduits 34, 35, and / or the pressure regulating valve 40 and / or the oil separator 23, whereby the test pressure is the generated negative pressure.
  • the existing in the lines 34, 35, and / or the pressure control valve 40 and / or the ⁇ labscheide worn 23 gas volume is conveyed into the crankcase 6, whereby a negative pressure.
  • the diagnosis is preferably carried out at a low load condition of the internal combustion engine 2 or at a standstill of the internal combustion engine 2.
  • overpressure is the different from the blow-by gas fluid in the present case to air from the environment 16 by an air line 66, which may be connected to the fresh air line 3 or may correspond to it, are conveyed by the conveyor 26 and can be introduced into the crankcase ventilation device 5.
  • an air filter 44 and a control valve 38 are arranged within the air line 66.
  • control members 38 are arranged to build up or maintain said negative pressure in the suction line 34 and the overpressure line 28, respectively.
  • control member 38 is opened up in the suction line 34 and / or the pressure line 28th build up an overpressure. Subsequently, all the control members 38 in the lines 34, 28, operated in such a way that no flow into or out of the section to be examined is possible.
  • the pressure control valve 40 is closed, wherein alternatively or additionally, another control member 38 is provided in the vent line 35, which already before the generation of the Overpressure or negative pressure, in any case, but then also closed.
  • the pressure measuring device 65 is arranged or the pressure measuring device 65 is connected to this section.
  • the control members 38 are closed directly on the crankcase 6 and in the air line 66 and the pressure control valve 40 and / or the control member 28 in the vent line 35, for example after generating the overpressure.
  • the pressure in the suction line 34 and the pressure line 28 is locked. If a pressure change, in particular a pressure decrease, is measured by means of the pressure measuring device 65 connected to the suction line 34 and / or the pressure line 28, this indicates a leak or leakage in the pressure line 28 or the suction line 34 , If the suction line 34 and the pressure line 28 to be tested separately for leaks, then the immediately suction side of the conveyor 26 arranged in the suction line 34 control member 38 is closed after the construction of the overpressure, so that a flow between the suction line 34 and the pressure line 28 is interrupted is.
  • FIG. 9 shows a further embodiment of the vehicle 1. In contrast to the embodiment shown in FIG.
  • a negative pressure is generated here for the diagnosis of the fuel tank 61 in the fuel tank 61, and the pressure changes are subsequently monitored by means of the pressure measuring device 65, in which case an increase in pressure indicates a leakage.
  • this control member 38 is opened, whereby the conveyor 26 promotes in particular steam-like hydrocarbons from the fuel tank 61.
  • the control member 38 is opened so far that in the fuel tank 61, a negative pressure, whereupon the control member 38 of the diagnostic device 60 is closed.
  • the diagnosis can be made as explained above.
  • the control member 38 can be opened so far that a normal venting of the fuel tank 61 takes place. In this case too, the tank venting device 49 corresponds to the diagnostic device 60 or vice versa.
  • vent line 35 is connected to the connection point 41 on the fresh air line 3.
  • suction line 34 via which the blow-by gas is sucked out of the crankcase, is connected on the input side to the connection point 39 on the vent line 35, with which the vent line 35 is fluidically connected to the fresh air line 3.
  • the blow-by gas extraction at a sufficiently low pressure conditions in the fresh air line 3 also passively, that is done without support of the conveyor 26.
  • This can also be used to active blow-by gas extraction by means of the conveyor 26 and the passive blow-by-gas extraction can be combined as desired.
  • the switching valve 38 is used, which regulates the connection between the suction line 33, 34 and the conveyor 26 and this can interrupt in particular.
  • the pressure control valve 40 and / or at least one of the throttle 45 and / or the throttle valve 19 may be used. These are controlled, for example, by the controller 58 or other controller.
  • the vehicle 1 may have at least one pressure measuring device in order to determine the pressure in the corresponding areas, such as in the fresh air line 3 and / or in the crankcase 6, which can be transmitted to the controller 58.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)

Abstract

La présente invention concerne un véhicule (1) pourvu d'un moteur à combustion interne (2) qui présente un carter de vilebrequin (6), d'un dispositif de dégazage (5) de carter de vilebrequin qui présente au moins un dispositif de séparation d'huile (23) et un conduit de retour d'huile (24) ramenant une huile séparée vers le carter de vilebrequin (6) et d'un dispositif de transport (26) pour entraîner un fluide différent du gaz présent dans le carter moteur. Un dégazage efficace du carter de vilebrequin peut être réalisé d'une manière peu onéreuse quand le dispositif de transport (26) est en outre utilisé pour entraîner le gaz présent dans le carter moteur dans le dispositif de dégazage (5) de carter de vilebrequin.
EP13707299.7A 2012-02-16 2013-02-12 Dispositif d'aeration de carter de moteur Not-in-force EP2815089B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE201210202405 DE102012202405A1 (de) 2012-02-16 2012-02-16 Fahrzeug
DE201210220800 DE102012220800A1 (de) 2012-11-14 2012-11-14 Fahrzeug mit Brennkraftmaschine und Kurbelgehäuseentlüftungseinrichtung
PCT/EP2013/052727 WO2013120820A1 (fr) 2012-02-16 2013-02-12 Dispositif de dégazage de carter de vilebrequin

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EP2815089A1 true EP2815089A1 (fr) 2014-12-24
EP2815089B1 EP2815089B1 (fr) 2017-09-06

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EP (1) EP2815089B1 (fr)
WO (1) WO2013120820A1 (fr)

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Also Published As

Publication number Publication date
US9238980B2 (en) 2016-01-19
US20150020785A1 (en) 2015-01-22
EP2815089B1 (fr) 2017-09-06
WO2013120820A1 (fr) 2013-08-22

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