WO2016016197A1 - Verfahren zum betreiben einer verbrennungskraftmaschine mit einem einstellbaren neustartverdichtungsverhältnis - Google Patents
Verfahren zum betreiben einer verbrennungskraftmaschine mit einem einstellbaren neustartverdichtungsverhältnis Download PDFInfo
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- WO2016016197A1 WO2016016197A1 PCT/EP2015/067176 EP2015067176W WO2016016197A1 WO 2016016197 A1 WO2016016197 A1 WO 2016016197A1 EP 2015067176 W EP2015067176 W EP 2015067176W WO 2016016197 A1 WO2016016197 A1 WO 2016016197A1
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- WIPO (PCT)
- Prior art keywords
- compression ratio
- internal combustion
- combustion engine
- restart
- crankshaft
- Prior art date
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/04—Engines with variable distances between pistons at top dead-centre positions and cylinder heads
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D15/00—Varying compression ratio
- F02D15/02—Varying compression ratio by alteration or displacement of piston stroke
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N19/00—Starting aids for combustion engines, not otherwise provided for
- F02N19/004—Aiding engine start by using decompression means or variable valve actuation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/0203—Variable control of intake and exhaust valves
- F02D13/0207—Variable control of intake and exhaust valves changing valve lift or valve lift and timing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D15/00—Varying compression ratio
- F02D15/04—Varying compression ratio by alteration of volume of compression space without changing piston stroke
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D2013/0292—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation in the start-up phase, e.g. for warming-up cold engine or catalyst
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N11/00—Starting of engines by means of electric motors
- F02N11/08—Circuits or control means specially adapted for starting of engines
- F02N11/0814—Circuits or control means specially adapted for starting of engines comprising means for controlling automatic idle-start-stop
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N2200/00—Parameters used for control of starting apparatus
- F02N2200/02—Parameters used for control of starting apparatus said parameters being related to the engine
- F02N2200/023—Engine temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N2200/00—Parameters used for control of starting apparatus
- F02N2200/02—Parameters used for control of starting apparatus said parameters being related to the engine
- F02N2200/024—Engine oil temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N2200/00—Parameters used for control of starting apparatus
- F02N2200/12—Parameters used for control of starting apparatus said parameters being related to the vehicle exterior
- F02N2200/122—Atmospheric temperature
Definitions
- the invention relates to a method for switching an adjustable variable compression ratio of an internal combustion engine.
- the internal combustion engine has an adjusting mechanism for adjusting the adjustable variable compression ratio, a crankshaft, a control device having a switching function for switching the adjusting mechanism and an operation detector for detecting an operating state of the internal combustion engine.
- Such an internal combustion engine is e.g. from WO-A-2014/019684 and from WO-A-2014/019683.
- the compression ratio can be set arbitrarily during operation of the internal combustion engine. Even such an internal combustion engine is subject to the same exhaust gas regulations both in continuous operation and during startup operation.
- the adjustable variable compression ratio of the internal combustion engine allows a large margin when operating the internal combustion engine. On the other hand, compliance with the prescribed emission guidelines is more difficult when starting such an internal combustion engine than with an internal combustion engine without an adjustable variable compression ratio.
- the object of the present invention is to improve the starting behavior of internal combustion engines with an adjustable compression ratio. This object is achieved by a method having the features of claim 1 and a device having the features of claim 10.
- Advantageous features, embodiments and further developments will become apparent from the following description, the figures as well as from the claims, wherein individual features of an embodiment are not limited to these. Rather, one or more features of one embodiment can be linked to one or more features of another embodiment to form further embodiments.
- the formulations of independent claims 1 and 10 in their filed form should not be construed as limiting the subject matter to be claimed. One or more features of the formulations can therefore be exchanged as well as omitted, but also be supplemented in addition.
- the features cited with reference to a specific exemplary embodiment can also be generalized or likewise used in other exemplary embodiments, in particular applications.
- a method for switching an adjustable variable compression ratio of an internal combustion engine according to claim 1 is proposed.
- the internal combustion engine includes an adjustment mechanism for actively and / or passively adjusting the adjustable variable compression ratio and a crankshaft.
- the method provides that the standstill of the crankshaft, the current compression ratio of the internal combustion engine is detected.
- the operating state of the internal combustion engine is detected and the detected operating state of the internal combustion engine assigned to a start-stop operation or a shutdown of the internal combustion engine.
- a restart compression ratio of the internal combustion engine is determined for a restart, and if the current compression ratio deviates from the desired restart compression ratio, the current compression ratio is adjusted toward the restart compression ratio.
- a restart can take place during a start-stop operation, for example when the internal combustion engine starts from a standstill, whereby the combustion combustion engine has already reached its operating temperature, or in cold internal combustion engine after a long service life, for example, of one day.
- the current compression ratio is compared with the restart compression ratio, and a difference between the current compression ratio and the restart compression ratio is determined. The adjustment of the compression ratio then serves to reduce this difference to zero.
- the crankshaft is braked to a standstill in a first step, in a second step a current compression ratio of the internal combustion engine detected, detected in a third step, the operating state of the internal combustion engine, in a fourth step, the operating state in assigned to a start-stop operation or a shutdown of the internal combustion engine, in a fifth step, a restart compression ratio of the internal combustion engine for a restart determined and adjusted in a sixth step, the current compression ratio in the direction of the restart compression ratio.
- Another embodiment provides that the above-mentioned steps are not performed in ascending order corresponding to the respective step numbers, but not according to the ascending numbering of the respective steps.
- the respective steps can be carried out in any order. For example, an operating state of the internal combustion engine can already be detected before a standstill of the crankshaft and this are assigned to a start-stop operation or a shutdown of the internal combustion engine.
- the current compression ratio of the internal combustion engine can be detected, for example, by means of a Hall sensor.
- a Hall sensor arranged on the engine block of the internal combustion engine and generates in cooperation with a arranged on a piston of the internal combustion engine magnet, a Hall voltage, which is detected by a control unit of the internal combustion engine.
- the piston passes through a bottom dead center in each case different position to the Hall sensor.
- the Hall voltage detected by the control unit can, for. B. the greater, the closer the bottom dead center of the piston, ie thus the bottom dead center of the magnet fixed to the piston, is located on the Hall sensor.
- the current compression ratio can be read in a further embodiment of the control unit or another control unit of the internal combustion engine, this read-out compression ratio is preferably a target compression ratio, which is set via the control unit a control loop and causes this adjustment, an adjustment of the adjustment mechanism to this Sollverdichtungst becomes.
- the current compression ratio may e.g. be equated with such a read-out compression ratio, this equating corresponds to an inventive detection of the current compression ratio.
- the proposed method further provides that the operating state of the internal combustion engine is detected.
- the speed, the speed change and / or the torque setpoint of the internal combustion engine and / or the speed acceleration of the crankshaft are detected.
- the detected operating state is assigned a start-stop operation or a shutdown of the internal combustion engine.
- the detected operating state can be assigned to an operating state which is similar to a start-stop operation and a shutdown of the internal combustion engine.
- Such a similar operating state of the internal combustion engine can, for. B. achieved when a speed of the crankshaft is detected, Wel- che is less than a predetermined by the control unit idle speed of the crankshaft.
- This can e.g. be effected in that a pulling out of the vehicle key is detected from an ignition lock device of the internal combustion engine.
- a shutdown of the internal combustion engine is assigned to the current operating state.
- the vehicle access system can therefore be used to detect and distinguish between the two states.
- An assignment of the current operating state to a shutdown of the internal combustion engine can also be realized in a further embodiment of the invention that the current position of the internal combustion engine, for example by means of a GPS system detected, compared with a already repeatedly detected parking position of the internal combustion engine and in If a coincidence is assigned to the current operating state, a shutdown of the internal combustion engine.
- a repeatedly detected stop position for example at a traffic light, can be detected on a path repeatedly detected by the GPS system, and then a start-stop operation can be assigned to the current operating state.
- the restarting compression ratio of the internal combustion engine for a restart is preferably dependent on at least one operating parameter of the internal combustion engine, such.
- As the oil temperature and / or the cooling water temperature of the internal combustion engine determined.
- a restart compression ratio can be determined, which is the smallest possible compression ratio of the internal combustion engine.
- a restart compression ratio in dependence on at least one environmental parameter such as an outdoor temperature can be determined. For example, at an outside temperature of below -20 ° C and a detected current operating state, which was assigned to a shutdown of the internal combustion engine, a new start compression ratio can be determined, which corresponds to a maximum compression ratio of the internal combustion engine.
- the internal combustion engine starts again after stopping, is not least also a question of the torque that can apply the starter. If the starter is strong enough, for example, he will be able to start a petrol or diesel engine even at maximum compression ratio.
- the compression ratio of the internal combustion engine can, as described in DE-A-10 2011108 790, be adjusted.
- the adjustable variable compression ratio is controlled via a release of a first or a second hydraulic line.
- the release of the first hydraulic line triggers an obstruction of a movement of the adjusting mechanism towards a first position of the adjusting mechanism, which corresponds to a first compression ratio of the internal combustion engine.
- the locking and releasing of the respective hydraulic lines can be done according to DE-A-10 2011108 790 by means of a slide valve.
- adjustment mechanisms are used for adjusting the compression ratio of the internal combustion engine, which work passively insofar as it utilizes the forces acting on the adjustable engine component (namely, gas forces and inertial forces), then it is expedient if the resource circuit (as a rule hydraulic circuit ) for the adjusting mechanism when the internal combustion engine is switched off, in the state which allows the compression ratio to be set to the restarting compression ratio at the next restart of the internal combustion engine.
- the release and locking of the respective hydraulic lines can be arbitrarily controlled.
- the detected compression ratio of the internal combustion engine is kept constant.
- the current compression ratio is adjusted before the standstill of the crankshaft. This can be carried out particularly advantageously when a start-stop operation has been assigned to the current operating state. Such an assignment can be made, for example, such that first a predetermined time interval continuous idling operation of the internal combustion engine is detected and then a deceleration of the crankshaft is detected. The detected deceleration of the crankshaft can, for. B. be compared with a typical braking of the crankshaft when the internal combustion engine is decelerated before a red light.
- such braking of the crankshaft can be stopped, and the inertia of the rotating crankshaft can be used to adjust the current compression ratio in the direction of the restart compression ratio.
- the internal combustion engine is operated at a detected start-stop operation with a briefly increased speed and the engine oil pressure is increased.
- an increased engine oil pressure can be used for adjusting the adjustment.
- a development of the method provides that in this case the internal combustion engine is decoupled from the transmission unit of the vehicle.
- a further embodiment of the method provides that the current compression ratio is adjusted after the standstill of the crankshaft. This can be z. B. by means of an oil pressure accumulator, wherein the oil pressure accumulator at least a predetermined time, such. B. 5 hours, one Oil pressure stores and the oil pressure accumulator is fluidly connected to the adjusting mechanism.
- an adjustment of the current compression ratio is carried out in the direction of the restart compression ratio by means of an oil pressure pump.
- the oil pressure pump may preferably be designed electrically.
- the oil pressure pump can be driven for example via an electric motor, which forms a hybrid drive with the internal combustion engine.
- an ambient temperature is also taken into account in this determination of the restarting compression ratio.
- a restart compression ratio can be determined, which corresponds to the maximum compression ratio E max of the internal combustion engine or a compression ratio close to the maximum compression ratio E max of the internal combustion engine.
- a restart compression ratio can be determined, which corresponds to the minimum compression ratio E min or a compression ratio close to the minimum compression ratio E min .
- a valve lift of a variable valve train of the internal combustion engine is adjusted.
- a valve lift of an exhaust and / or inlet valve of the internal combustion engine is increased.
- the variable valve train is adjusted during an adjustment of the compression ratio in the direction of the restart compression ratio.
- Such an adjustment of the variable valve train allows, for example, an oil pressure accumulator, which preferably applied after a standstill of the crankshaft, the adjusting mechanism for adjusting the compression ratio with a pressure to dimension lower.
- an internal combustion engine having an adjustable variable compression ratio, an adjusting mechanism for adjusting the variable variable compression ratio, a crankshaft, and a controller is proposed.
- the internal combustion engine includes an operation detector for detecting an operation state of the internal combustion engine, a start-stop operation, and a sleep operation mode.
- the controller is coupled to the operation detector.
- the control unit determines a restart compression ratio as a function of at least one operating parameter of the internal combustion engine and as a function of a start-stop operation or rest or stop operation of the internal combustion engine detected by the operating detector.
- a comparison function for comparing the restart compression ratio with a current compression ratio of the internal combustion engine is provided. Further, the controller causes an adjustment of the current compression ratio toward the restart compression ratio, if both are currently different from each other.
- the internal combustion engine has an oil pressure accumulator, by means of which the adjusting mechanism is adjustable.
- the oil pressure accumulator is controlled by means of a control device of the internal combustion engine such that upon detecting an operating state of the internal combustion engine, which corresponds to a start-stop operation or a Absteil Anlagensmodus, an oil pressure is built up in the oil pressure accumulator. This can be effected particularly advantageously by means of a short acceleration of the internal combustion engine.
- the internal combustion engine has a phase-changing medium (PCM), by means of which the adjusting mechanism is adjustable.
- the phase-changing medium can, for. B. when falling below an outside temperature below a value of -20 ° C from a liquid to a solid state.
- the density decreases with a transition of the medium from the liquid to the solid state, wherein a pressure for adjusting the adjusting mechanism can be established.
- the oil pressure accumulator on a phase-changing medium which supports a structure of the oil pressure in the oil pressure accumulator at a fall below the outside temperature, for example below a value of -20 ° C.
- data which are, for example, the current time of day, the current position of the internal combustion engine, appointment entries in an automatically readable calendar and / or the weather forecast can be estimated with the standstill of the crankshaft of the internal combustion engine under certain circumstances, for how long the Internal combustion engine remains out of service. For example, if the internal combustion engine is switched off in the evening, it can be assumed that it will be parked until the next morning.
- the restart compression ratio can already be determined and, above all, set when the internal combustion engine is switched off, as might be required to restart the internal combustion engine after a longer shutdown phase. For example, we determined from the data in a calendar that the internal combustion engine is only switched off for a short time (eg because According to Kalander, an appointment at which the driver drove his vehicle has a duration at which the internal combustion engine is either completely cooled down (which may also depend on the weather forecast) or is not completely cooled down Reboot compression ratio according to the anticipated when restarting the internal combustion engine conditions to be preset.
- the restart compression ratio can be selected accordingly.
- the above-mentioned considerations aim to determine the restart compression ratio, if not to turn off the internal combustion engine due to a current start-stop operation, shortly after the shutdown and also adjust if necessary. If the restart compression ratio in the initial phase after the shutdown of the internal combustion engine is not immediately determined and possibly also adjusted, it can be determined and adjusted based on the current operating and environmental parameters of the internal combustion engine, which exist at the time of restarting. The aforementioned additional information is available either online or offline.
- the compression ratio of a reciprocating internal combustion engine can be set simultaneously for all cylinders or for all cylinders of a cylinder bank or set for the individual cylinders of the reciprocating internal combustion engine, in all the cases mentioned above either actively or passively.
- the geometry of an engine component such as the connecting rod length, the crankshaft radius, the bearing of the crankshaft and / or the storage of the compression piston on the connecting rod and thus the effective connecting rod length is preferably changed. This is preferably done hydraulically, ie. using a medium.
- the motor oil is especially suitable as a medium.
- the active adjustment means that an adjustment of the relevant engine component is achieved by the action of external adjusting forces on the adjusting mechanism.
- the passive adjustment means that acting on the engine component during operation of the internal combustion engine forces such as the gas pressure forces and the inertial forces are utilized to effect an adjustment of the engine component.
- forces such as the gas pressure forces and the inertial forces
- passive adjustment because of the utilization of these forces, an automatic adjustment of the engine component occurs, while in the case of active adjustment from the outside, ie. in addition to the aforementioned acting forces or independently of these even more adjusting forces are introduced.
- Fig. 1 is a sectional view of an internal combustion engine with an adjustable variable compression ratio is shown.
- Fig. 1 shows an internal combustion engine 1 having an adjustable compression ratio, an adjustment mechanism 2 for adjusting the adjustable compression ratio, a crankshaft 3, a controller 4, and an operation detector 5 for detecting an operating state of the internal combustion engine 1.
- the internal combustion engine has a start-stop operation and a rest operation mode ,
- the control unit 4 is coupled to the operation detector 5.
- the control unit determines, as a function of a start-stop operation or idle operation detected by means of the operation detector 5 and of at least one operating parameter of the combustion. combustion engine a restart compression ratio.
- a comparison function is preferably provided for comparing the restarting compression ratio with a current compression ratio of the internal combustion engine.
- the control unit 4 causes an adjustment of the current compression ratio in the direction of the respectively desired restart compression ratio.
- the internal combustion engine 1 also has a rotational speed sensor 6 for detecting the rotational speed of the crankshaft 3.
- the speed sensor 6 is preferably connected to the control unit 4 and / or to the operation detector 5.
- the internal combustion engine 1 has a temperature sensor 7, which is e.g. detects the temperature of the engine oil of the internal combustion engine 1.
- the temperature sensor 7 and the speed sensor 6 are preferably electronically coupled to the control unit 4 and / or to the operation detector 5.
- a magnet 9 is arranged on a compression piston 8 of the internal combustion engine 1, preferably adhesively bonded.
- the internal combustion engine 1 has a sensor 10, preferably a Hall sensor.
- the sensor 10 is arranged, for example, on a crankcase of the internal combustion engine 1.
- the position of the magnet 9 can be detected and thus closed to the current compression ratio of the internal combustion engine 1.
- the position of the magnet 9 is detected by reaching the bottom dead center of the compression piston 8 by means of the sensor 10, wherein the bottom dead center of the compression piston 8 is detected for example with a crankshaft sensor.
- the current compression ratio of the internal combustion engine 1 e.g., the current compression ratio of the internal combustion engine 1.
- the magnet 9 is at the maximum possible compression ratio E max at a position which at the bottom dead center the greatest possible distance to the sensor 10 has.
- E max the maximum possible compression ratio
- the magnet 9 can be located when passing through the bottom dead center of the compression piston 8 at a position which has the smallest possible distance of the magnet 9 to the sensor 10.
- Zwi see the minimum possible and maximum possible compression ratio, ie between E min and E max , any compression ratio of the internal combustion engine 1 is adjustable in a preferred embodiment of the invention.
- a function is stored in the control unit 4, which sets the position of the magnet 9 when reaching the bottom dead center of the compression piston 8 in relation to the current compression ratio of the internal combustion engine 1.
- the adjustment of the compression ratio of the internal combustion engine 1 via the adjusting mechanism 2 is preferably carried out via drainage of a fluid either from a first working space 11 or from a second working space 12 and under the action of inertial forces or gas forces during operation of the internal combustion engine 1.
- a possible variant of the adjustment of Compression ratio is described in detail in DE-A-10 2005 055 199, wherein the first working space 11 the working space 29.2 and the second working space 12 the working space 29.1 of FIG. 1 corresponds to this document.
- Another possibility for adjusting the compression ratio by means of the adjustment mechanism 2 is given by the application of pressure to the respective working spaces 11 and 12.
- a pressure preferably displaces a piston which delimits the respective working space 11 or 12.
- an eccentric device 13 is adjusted.
- the distance of the compression piston 8 is changed to the crankshaft 3, wherein at a greater distance of the compression piston 8 to the crankshaft 3, a compression space 14 is reduced and at a smaller distance of the compression piston 8 to the crankshaft 3 of the compression chamber 14 is increased.
- a larger compression space 14 corresponds to a small and a smaller compression space 14 according to a larger compression ratio of the internal combustion engine 1.
- the oil pressure accumulator 15 is preferably connected hydraulically via the crankshaft 3, a connecting rod bearing 16 and a switching element 17. Via the switching element 17, a hydraulic connection can be made depending on the switching position of the switching element 17 to the first working space 11 or the second working space 12.
- the adjustment mechanism 2 can also be adjusted via the oil pressure accumulator 15 even when the crankshaft is at rest.
- an embodiment provides that a GPS sensor 18 of the internal combustion engine 1, which is electrically coupled to the control unit 4, a position of the internal combustion engine 1 on a repeatedly detected path, e.g. a commute.
- the control unit 4 preferably detects a current engine temperature of the internal combustion engine 1.
- the current operating state of the internal combustion engine 1 can be detected via the rotational speed sensor 6.
- the operation detector 5 can detect by means of the speed sensor 6 falls below the speed of the crankshaft 3 under a predetermined by means of the control unit 4 idle speed. In such a fall below the speed of the crankshaft 3, the operation detector 5 with the aid of the evaluated by the GPS sensor 18 information that the internal combustion engine 1 is on a repeatedly detected path, the current operating condition of the internal combustion engine, a start-stop operation assign.
- a restart compression ratio of the internal combustion engine 1 for a restart is preferably determined taking into account the detected engine temperature. For example, at an engine temperature above 85 ° C, ie. with warm-running internal combustion engine 1, the restart compression ratio to the minimum possible compression ratio E min be determined. Starting the internal combustion engine 1 at a minimum possible compression ratio E min facilitates a start, ie a restart, of the internal combustion engine 1 in a start-stop mode.
- a starter generator of the internal combustion engine 1 are dimensioned lower, which reduces manufacturing and operating costs of the internal combustion engine 1.
- a low compression ratio also reduces the internal friction, such as caused by piston side forces, which ultimately leads to a quiet starting of the internal combustion engine in terms of comfort.
- the current compression ratio is determined by means of the sensor 10.
- the sensor 10 is preferably electrically connected to the control unit 4. If the actual compression ratio is different (ie higher or lower) from the restart compression ratio, according to the invention the actual compression ratio of the internal combustion engine 1 is adjusted in the direction of the restart compression ratio. On the one hand, this adjustment can still take place when the crankshaft 3 is rotating and, on the other hand, even after a standstill of the crankshaft 3.
- the switching element 17 has two positions, a first position for adjusting the adjusting mechanism 2 such that the compression ratio of the internal combustion engine 1 is increased when the crankshaft 3 rotates, and secondly a second position for adjusting the adjusting mechanism 2, that the compression ratio of the internal combustion engine 1 is reduced.
- the switching element 17 can release a first hydraulic channel 19 in the first position. Through the release, the fluid, which is located in the second working chamber 12, can flow off via the switching element 17 and preferably via the crankshaft 3.
- the eccentric Turn device 13 in the direction of arrow A, wherein a distance of the compression piston 8 is increased to the crankshaft 3 and the current compression ratio of the internal combustion engine is increased.
- the switching element 17 releases a second hydraulic channel 20, wherein the current compression ratio of the internal combustion engine 1 is reduced.
- the hydraulic channels 19 and 20 via the switching element 17 and a crankshaft fluid channel, which preferably extends along a central axis of the crankshaft 3, are hydraulically connected to a valve.
- this valve is opened during the rotation of the crankshaft 3 such that the fluid, which is located either in the first working space 11 or in the second working space 12, can flow away.
- the valve position of the oil pressure accumulator is not fluidly connected to the first working space 11 or in the second working space 12; the valve blocks these connections.
- a special embodiment of the method according to the invention provides that when the crankshaft 3 is stopped, the valve is switched in such a way that the crankshaft fluid channel is fluid-conductively connected to the oil pressure accumulator 15.
- the switching element 17 Shortly before the standstill of the crankshaft 3, the switching element 17 is switched from the first position to the second position or from the second to the first position, depending on whether the current compression ratio of the internal combustion engine 1 is increased or decreased. This can be a retardation of the current compression ratio in one Preventing direction away from the restart compression ratio.
- the functionality of the adjusting mechanism 2, as described in DE-A-10 2005 055 199 preferably comes to a standstill since there are no longer any inertia forces and the engine oil pressure drops.
- the working spaces 11 and 12 respectively, preferably by means of the oil pressure accumulator 15, be pressurized. However, in this case, the functions of the working spaces 11 and 12 preferably reverse.
- the current compression ratio is increased.
- pressure is exerted on the second working chamber 12 due to the shared hydraulic channel 19, so that the eccentric device 13 is displaced in the opposite direction of the arrow ⁇ , wherein the current compression ratio of the internal combustion engine 1 is reduced.
- the switching element 17 is preferably switched over with an actuating element as described in WO-A-2014/019683.
- an actuating element is particularly advantageously displaced prior to a complete rotation of the crankshaft 3 before the crankshaft 3 stops, so that the change-over element 17 is switched over before the crankshaft 3 comes to a standstill, ie. is moved from the first position to the second position and from the second position to the first position.
- oil pressure accumulator 15 instead of the oil pressure accumulator 15 and an oil pressure pump can be used. Furthermore, it can also be provided that oil pressure, preferably in the oil pressure accumulator 15, is generated by means of a phase-changing medium. It can be z. B. fall below an outside temperature below a value of -20 ° C, the phase-change medium (PCM) of a liquid to a solid state of matter and cause an increase in volume in this transition, the oil pressure in the oil pressure accumulator 15 is increased.
- PCM phase-change medium
- the internal combustion engine 1 can be detected by means of the operating detector 5 and / or the control unit 4, for example by means of the detected engine temperature of approximately the ambient temperature with the aid of the temperature sensor 7, by means of an adjusting unit, such as the oil pressure accumulator 15, an oil pressure pump and / or a phase change medium, an optimized restart compression ratio E opt can be set.
- This optimized restart compression ratio E opt can for example be optimized so that the internal combustion engine 1 having opt optimum exhaust emissions during a cold start-adjusted compression ratio E.
- An optimization can z. B. with regard to a soot formation, a HC formation, a NO x formation and / or a CO formation may be formed.
- a shutdown of the internal combustion engine 1 can be detected, for example, by means of an afterglow detected by means of the operating detector 5 and / or the control unit 4.
- the adjusting device is switched such that an increase in the current compression ratio of the internal combustion engine 1 is effected.
- This offers a safe start at low temperatures, in particular in a diesel operation of the internal combustion engine 1.
- the adjusting device can be designed, for example, such that when the ambient temperature drops below -20 ° C., for example, a switching valve opens a fluid channel within the crankshaft 3, which is fluid-conductively connected to the adjusting device and releases a fluid-conducting access to the first working chamber 11.
- the crankshaft 3 preferably has two fluid-conducting channels arranged separately from one another, wherein the second fluid-conducting channel is preferably fluid-conductively connected to the first working space 11 without a valve.
- the crankshaft 3 is connected to the adjusting device only via a fluid-conducting channel and the switching element 17 is switched over when the ambient temperature falls below -20 ° C., so that a fluid-conducting connection between the adjusting device and the first working space 11 exists.
- the internal combustion engine 1 also has at least one inlet valve
- variable valve train 24 is operated such that the valve lift of the intake valve 22 and / or the exhaust valve 23 is increased.
- An increase in the valve lift of the intake valve 22 and / or the exhaust valve 23 may preferably facilitate a discharge of gas, which is located in the cylinder of the internal combustion engine 1.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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DE112015003480.3T DE112015003480A5 (de) | 2014-07-29 | 2015-07-27 | Verfahren zum Betreiben einer Verbrennungskraftmaschine mit einem einstellbaren Neustartverdichtungsverhältnis |
Applications Claiming Priority (2)
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DE102014010973 | 2014-07-29 | ||
DE102014010973.9 | 2014-07-29 |
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WO2016016197A1 true WO2016016197A1 (de) | 2016-02-04 |
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PCT/EP2015/067176 WO2016016197A1 (de) | 2014-07-29 | 2015-07-27 | Verfahren zum betreiben einer verbrennungskraftmaschine mit einem einstellbaren neustartverdichtungsverhältnis |
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DE (1) | DE112015003480A5 (de) |
WO (1) | WO2016016197A1 (de) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109653870A (zh) * | 2017-10-12 | 2019-04-19 | Fev欧洲有限责任公司 | Vcr往复式活塞压缩机 |
DE102019100289A1 (de) * | 2019-01-08 | 2020-01-16 | ECO Holding 1 GmbH | Pleuel einer Brennkraftmaschine mit variabler Verdichtung |
CN113227560A (zh) * | 2018-11-06 | 2021-08-06 | 日产自动车株式会社 | 内燃机的控制方法及控制装置 |
AT524594A1 (de) * | 2020-12-22 | 2022-07-15 | Avl List Gmbh | Verfahren zum Steuern einer wirksamen Länge eines längenverstellbaren Pleuels für eine Hubkolbenmaschine |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6595187B1 (en) * | 2000-10-12 | 2003-07-22 | Ford Global Technologies, Llc | Control method for internal combustion engine |
EP1688707A1 (de) * | 2005-02-02 | 2006-08-09 | Deere & Company | Fahrzeugnavigation mit standortbasierter Lärmreduzierung |
DE102010019756A1 (de) * | 2010-05-07 | 2011-11-10 | Daimler Ag | Verfahren zum Betreiben einer Hubkolbenmaschine |
DE102010032488A1 (de) * | 2010-07-28 | 2012-02-02 | Daimler Ag | Verfahren zum Betreiben einer Hubkolbenmaschine |
US20140137824A1 (en) * | 2012-11-21 | 2014-05-22 | GM Global Technology Operations LLC | Engine assembly with phasing mechanism on eccentric shaft for variable cycle engine |
-
2015
- 2015-07-27 DE DE112015003480.3T patent/DE112015003480A5/de not_active Withdrawn
- 2015-07-27 WO PCT/EP2015/067176 patent/WO2016016197A1/de active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6595187B1 (en) * | 2000-10-12 | 2003-07-22 | Ford Global Technologies, Llc | Control method for internal combustion engine |
EP1688707A1 (de) * | 2005-02-02 | 2006-08-09 | Deere & Company | Fahrzeugnavigation mit standortbasierter Lärmreduzierung |
DE102010019756A1 (de) * | 2010-05-07 | 2011-11-10 | Daimler Ag | Verfahren zum Betreiben einer Hubkolbenmaschine |
DE102010032488A1 (de) * | 2010-07-28 | 2012-02-02 | Daimler Ag | Verfahren zum Betreiben einer Hubkolbenmaschine |
US20140137824A1 (en) * | 2012-11-21 | 2014-05-22 | GM Global Technology Operations LLC | Engine assembly with phasing mechanism on eccentric shaft for variable cycle engine |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109653870A (zh) * | 2017-10-12 | 2019-04-19 | Fev欧洲有限责任公司 | Vcr往复式活塞压缩机 |
CN109653870B (zh) * | 2017-10-12 | 2022-04-12 | Fev欧洲有限责任公司 | Vcr往复式活塞发动机 |
CN113227560A (zh) * | 2018-11-06 | 2021-08-06 | 日产自动车株式会社 | 内燃机的控制方法及控制装置 |
DE102019100289A1 (de) * | 2019-01-08 | 2020-01-16 | ECO Holding 1 GmbH | Pleuel einer Brennkraftmaschine mit variabler Verdichtung |
AT524594A1 (de) * | 2020-12-22 | 2022-07-15 | Avl List Gmbh | Verfahren zum Steuern einer wirksamen Länge eines längenverstellbaren Pleuels für eine Hubkolbenmaschine |
AT524594B1 (de) * | 2020-12-22 | 2022-08-15 | Avl List Gmbh | Verfahren zum Steuern einer wirksamen Länge eines längenverstellbaren Pleuels für eine Hubkolbenmaschine |
Also Published As
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DE112015003480A5 (de) | 2017-06-14 |
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