Internal combustion engine operation method

FIELD: engine building.

SUBSTANCE: invention refers to the methods of internal combustion engine operation with forced ignition of operating mixture of, for example, automobile. The operating method for internal combustion engines in the form of internal combustion engine with forced ignition of operating mixture consists in injection of fuel with at least one fuel injector. Optionally instead of fuel injection for the forced ignition engines or additionally to fuel injection gas can be used. During operation with only gas used automatically preliminary set time interval is switched to the fuel for engines with forced ignition or operation with fuel for forced ignition engines is switched to the operation with gas so that certain amount of fuel for engines with forced ignition flows through at least one fuel injector, at this then it automatically switches to the operation with gas only. Fuel for forced ignition engines is injected directly to at least one combustion chamber of internal combustion engine. Temperature load of the mentioned at leat one fuel injector during work with gas only is defined depending on the engine working point and it is estimated and integrated according to the time. Automatic switching and/or work of fuel injection for forced ignition engines are ensured during operation with gas if this heat load exceeds preliminary set threshold value.

EFFECT: improvement of internal combustion engine operation method in respect to reliability of fuel injectors.

3 cl, 2 dwg

 

The invention relates to a method of operating an internal combustion engine in the form of an internal combustion engine with forced (spark) ignition mixture, in particular a vehicle, and fuel for engines with positive ignition, in particular, gasoline or ethanol (E85), through at least one fuel injector directly spryskivaetsya in at least one combustion chamber of the internal combustion engine, and by choice instead of fuel injection for engines with positive ignition or in addition to the injection of fuel to the internal combustion engine is operated with gas, in particular compressed natural gas (CNG) or liquefied petroleum gas (LPG), according to the restrictive part of paragraph 1 of the claims.

In the internal combustion engine with direct injection gasoline injectors injection under high pressure for injection of liquid fuels for engines with positive ignition end directly into the combustion chamber. As a consequence, the injectors when the engine due to combustion occurring in the combustion chamber, filling with hot gaseous products of combustion and heated. The injectors are cooled by the injected fuel, and channels the filing of the cooling water of the engine, passing in the immediate vicinity of the injector. When running this with a direct injection internal combustion engine on compressed natural gas (CNG), as, for example, known from EP 0718484 B1, there is a danger that in CNG mode injectors high pressure, due to the lack of passage of liquid fuel, heated and as a consequence damaged, or even inside the injectors, the fuel forms a deposition, which in turn negatively affect the operation of the injectors. The longer gas mode deactivated petrol injection, the higher the risk that available inside the fuel injector arise deposition, which degrades the correct mode of operation of the injector.

From WO 2004/097196 A1 famous LPG fuel system for engines with positive ignition of the working mixture, and fuel for engines with positive ignition through the valve nozzle for fuel for engines with positive ignition, a LPG-by LPG-valve injector injected into the suction pipe of the engine with forced ignition. To the functionality of the valve nozzle for fuel for engines with positive ignition to maintain a current during operation of the engine on LPG, when you turn off the engines the El is automatically switched into the operating mode for the fuel for the engine with forced ignition, with the engine a few seconds is operated on fuel for engines with positive ignition to lubricate the valve injectors and keep them in serviceable condition. Simultaneously LPG pump continues to operate, in order to apply liquid LPG in the LPG-valve nozzle and completely remove gaseous LPG. After a predetermined time interval to switch the mode back to work on LPG.

The basis of the invention lies task is to improve a method of the aforementioned type in terms of reliability of functioning of the fuel injectors.

This task according to the invention is solved by a method of the aforementioned type with the distinctive signs of paragraph 1. Preferred embodiments of the invention are described in the other claims.

For this purpose, the method of the above type in accordance with the invention provides that the fuel for engines with positive ignition is injected directly into at least one combustion chamber of the internal combustion engine, and thermal load, at least one fuel injector during operation mode gas is determined depending on the operating point of the engine, and is measured and integrated over time, and automatic switching on and/or the switching to the fuel injection for engines with positive ignition is carried out during operation at gas if this thermal load exceeds a predetermined threshold value.

This has the advantage that the fuel injectors even in the mode of operation on gas cooled enough and, consequently, deposition, existing on or in the fuel injectors are removed if you are already experiencing. This provides improved reliability of gas engines operating on two fuels, by reducing the negative current of carbon formation on the fuel injectors.

The preferred way switch works with fuel for engines with positive ignition or the connection mode with the fuel for engines with positive ignition is in the predefined operating phases of the internal combustion engine, for example, at idle, with the introduction phase of the motor has been switched off and/or during the shutdown phase of the motor has been switched off and/or when a predefined operating conditions of the internal combustion engine, such as higher coolant temperature of 40C.

Upon occurrence of a predefined operating phase and/or a predefined conditions, which should be switching to a mode of operation with fuel for engines with positive ignition or the connecting mode of operation with fuel for engines with positive ignition, preferably vidaetsja a predetermined time delay (dead time), for example from 2 seconds to 10 seconds, in particular 5 seconds, until actually will be switching to a mode of operation with fuel for engines with positive ignition or the connection mode with the fuel for engines with positive ignition.

In one preferred embodiment, the predetermined amount of fuel for engines with positive ignition, which occurs during the automatically activated phase with the injection of fuel for engines with positive ignition through at least one fuel injector, equal parts, the whole and/or multiple of the value of the volume of fuel for engines with positive ignition accumulated in the fuel injector.

The preferred way is divisible by the value of the amount of fuel accumulated in the fuel injector, ranging from 2-fold to 200-fold, in particular from 3-fold to 5-fold volume accumulated in the fuel injector.

After automatically activated phase with the injection of fuel for engines with positive ignition preferably vidaetsja a predetermined time locking, for example from 200 seconds to 40,000 seconds, in particular from 2000 to 10000 seconds is econd, in particular 5000 seconds before allowed automatic re-activation of fuel injection for engines with positive ignition.

After a predetermined maximum time, for example from 500 seconds to 60000 seconds, in particular from 3000 seconds to 15000 seconds, particularly 6000 seconds, the operation mode of the internal combustion engine gas, within which there is an automatic activation of fuel injection for engines with positive ignition, regardless of the operating state of the operating parameters of the internal combustion engine is automatically activated to inject fuel for engines with positive ignition.

The period of time for the maximum time it starts leaking preferably only from the end of the time lock.

The invention is illustrated hereinafter with reference to the drawings showing the following:

figure 1 is a schematic block diagram of the preferred option corresponding to the invention of a method and

figure 2 - graphical representation of the process NEFZ-profile traffic.

Below with reference to figure 1 describes a sample corresponding to the invention, a method of operating a bivalent (i.e. running on two fuels) of the internal combustion engine, i.e. the internal combustion engine, the which can be operated on the choice of fuel for engines with positive ignition (gasoline or ethanol), injected from the fuel injectors into the combustion chamber of the internal combustion engine, or gas (CNG or LPG)introduced preferably in the suction pipe of the internal combustion engine.

In the functional block 10 "working point/working settings are determined by the operating point and the operating parameters, such as temperature of the internal combustion engine, and entered as the weighing feature 12, and in function block 14 "integration in the load parameter thermal load injector. In weighing the characteristic 12 thermal load of fuel injectors is recorded as a function of the operating point and the operating parameters, such as temperature of the engine.

This particular thus thermal load of fuel injectors is supplied to the functional block 14, in which this value is integrated over time to obtain the load parameter. The result of this integration in a subsequent functional block 16 "load option > the ultimate value compared with a predefined limit value or threshold value. If a particular functional unit 14, the load parameter is less than or equal to the limiting value, then through the branch 18 is a return to the functional unit 10. If, in contrast, is defined in functionalname block 14, the load parameter is larger than the limit value, then through the branch 20 is moving to the functional block 22 "switch working modes: work on gas for work on fuel for engines with positive ignition, with temporary and periodic adjustment or control so long to switch from work mode to gas mode of operation on fuel for engines with positive ignition or the fuel for engines with positive ignition connects to the mode of operation on gas, while at least part, and preferably the entire amount of fuel for engines with positive ignition, in particular, more than the amount of fuel for engines with positive ignition, will not be injected to the inside of the fuel injector so that the injector is cooled by the incoming fuel, and deposition are eliminated. Then the engine control again switches back to the mode of operation on gas. Switching through control of the motor is preferably based on the embedded strategy: empirically established thermal load of the fuel injector high pressure mode of operation on gas engine integrates time and weighed (estimated) depending on the operating point of the engine, as laid down in the weighing indicator is Ristic 12. Starting from some threshold value switches from gas to fuel and back on the gas (purging). The preferred way mode on fuel for engines with positive ignition is provided when the input and/or the end phase of the turn off the engine.

Total injected amount of fuel for engines with positive ignition switching or connecting the injection of fuel for engines with positive ignition (purging) is, for example, at least the amount of the fuel injector to make a complete flushing of the injector. However, it is better to blow out from 2-fold to 100-fold volume, ideally from 3-fold to 5-fold volume.

In this phase, the purge is a clean mode of operation on fuel for engines with positive ignition mode or mixed mode operation on fuel and gas.

Preferably the process of purging is carried out on idle, preferably above specified minimum cooling temperature, for example 40C. After recognition of idling at first supported the applicable downtime or lag (dead time) from 2 seconds to 10 seconds, in the ideal case, 5 seconds of pure mode of operation on gas before nachine is in the process of purging, that is, the temporary activation of fuel injection for engines with positive ignition.

The preferred way, after purging, determined the time of locking, in which even if you are still having idle mode is not initiated another purging. This time the lock is, for example, from 200 seconds to 40,000 seconds, optimally from 2000 seconds to 10,000 seconds, in particular 5000 seconds.

If within a predetermined time interval after the time of locking is not performed, the process of purging in idle mode, after the expiration of the maximum time, regardless of the state of the operation mode of the internal combustion engine, initiated the process of purging. This maximum time is, for example, from 500 seconds to 60000 seconds, optimally from 3000 seconds to 15000 seconds, particularly 6000 seconds.

Once started the process of purging is preferably not interrupted and continues regardless of the state of the operation mode of the internal combustion engine.

Figure 2 illustrates corresponding to the invention the actuation of the purge processes during the so-called NEFZ-profile traffic (NEFZ: New European driving cycle). When the internal combustion engine is first operated solely on gas, and about the ECC flushing should always be initiated without prior downtime in case when idling, and the temperature of the engine 10 exceeds 40C. On the horizontal axis 24 marked the time t in seconds, and the vertical axis 26 to the speed v of the vehicle in km/h. Graph 28 shows the speed v of the vehicle at time t during the NEFZ-profile traffic. At points 30, 32, 34 and 36 does the time lock, which prevents the initiation phase mode of operation on fuel for engines with positive ignition (purging). Position 38 indicated the maximum time after which compelled phase mode of operation on fuel for engines with positive ignition, although no idling. Positions 40, 42, 44 and 46 indicated phase mode, in which the process of purging, that is, the phase mode of operation on fuel for engines with positive ignition.

During the first approximately 210 seconds NEFZ-cycle engine temperature is below 40C, so that the activation mode on fuel for engines with positive ignition is suppressed. The internal combustion engine operates exclusively on gas. After the first phase 40 purge time 30 locking prevents first, despite idling, other phases with the duty on fuel for engines with positive ignition. Only when the second phase 42 about uwci time 30 lock expires. The same is true for the next time 32 locking and third phase 44 purge. After this third phase 44 purge time 34 of the first locking prevents other phases with the duty on fuel for engines with positive ignition, despite the occurrence of idling phases. After about more than 800 seconds, 34 lock is held, but no longer occur phase idling, so not initiated phase with the duty on fuel for engines with positive ignition. Only after the maximum time of 40 forced the fourth phase 46 purge, although there idling. In conclusion, once again becomes the active time 36 locking, which suppresses until the end NEFZ-cycle other phases with the duty on fuel for engines with positive ignition.

1. A method of operating an internal combustion engine in the form of an internal combustion engine with forced ignition of the mixture, and fuel for engines with positive ignition is injected through at least one fuel injector, and the choice instead of fuel injection for engines with positive ignition or in addition to the injection of fuel for engines with positive ignition internal combustion engine exp is watermedia gas, moreover, during operation of the internal combustion engine only gas automatically at a predefined time interval switches to the mode of operation on fuel for engines with positive ignition or fuel for engines with positive ignition connects to the mode of operation on gas so that a predetermined amount of fuel for engines with positive ignition flows through at least one fuel injector, and then again automatically switch back to mode works only on gas, characterized in that the fuel for engines with positive ignition is injected directly into the at least one camera combustion of the internal combustion engine, and thermal load of the mentioned at least one fuel injector during operation mode gas is determined depending on the operating point of the engine, and is measured and integrated over time, and automatic switching on and/or connected to the injection of fuel for engines with positive ignition is carried out during the mode of operation on gas, if this thermal load exceeds a predetermined threshold value.

2. The method according to claim 1, characterized in that p is relucta on the mode of operation on fuel for engines with positive ignition or connection mode on fuel for engines with positive ignition is performed in predefined working phases and/or at pre-defined operating conditions of the internal combustion engine.

3. The method according to claim 2, characterized in that the predefined operating phase include idling, the introduction phase of the motor has been switched off and/or the completion of phase shutdown of the internal combustion engine.

4. The method according to claim 2, characterized in that upon the occurrence of a predefined operating phase and/or a predefined conditions, which must be the switch work on fuel for engines with positive ignition or connection mode on fuel for engines with positive ignition, vidaetsja a predetermined idle time, while in fact there will be no switch work on fuel for engines with positive ignition or connection mode on fuel for engines with positive ignition.

5. The method according to claim 4, characterized in that the predetermined delay time is from 2 to 10, in particular 5 C.

6. The method according to claim 2, wherein the predefined conditions include the temperature of the cooler at least 40C.

7. The method according to claim 1, characterized in that a predetermined number t of the fuel for engines with positive ignition, which takes place during the automatically activated phase with the injection of fuel for engines with positive ignition through at least one fuel injector, equal parts, the whole and/or multiple of the value of the volume of fuel for engines with positive ignition accumulated in the fuel injector.

8. The method according to claim 7, characterized in that a multiple of the value of the volume of fuel for engines with positive ignition accumulated in the fuel injector, ranging from 2-fold to 200-fold, in particular from 3-fold to 5-fold volume accumulated in the fuel injector.

9. The method according to claim 1, characterized in that after automatically activated phase with the injection of fuel for engines with positive ignition preferably vidaetsja a predetermined time lock before allowed to re-activate fuel injection for engines with positive ignition.

10. The method according to claim 9, characterized in that the time lock is from 200 to 40,000, in particular from 2000 to 10000, in particular 5000 S.

11. The method according to claim 1, characterized in that after a predetermined maximum time, the operation mode of the internal combustion engine gas, within which there is an automatic activation of itracku the of fuel for engines with positive ignition, regardless of the operating status and operating parameters of the internal combustion engine is automatically activated to inject fuel for engines with positive ignition.

12. The method according to claim 11, characterized in that the maximum time is from 500 to 60000 with, in particular from 3000 to 15000 with, in particular, 6000 S.

13. The method according to item 12, wherein the maximum time begins to run only after the time of locking.



 

Same patents:

FIELD: transport.

SUBSTANCE: electronic control unit (ECU) of the engine executes a program with the following stages: detecting the value of the engine vibration (stage S102); detecting the wave shape of the engine vibration based on the said value (stage S104); calculating the quotient K of correlation if the engine rotational frequency NE is less than the threshold value NE (1), using the sum of the values where each value is calculated by substracting the positive reference value from the value taken in the shock shape model , the sum is used as the area S of the shock shape model; and calculating the quotient K of correlation if the engine rotational frequency NE is not less than the threshold value NE (1), using the whole area S of the shock shape model (stage S114); and determining whether the detonation occurred or not, using the quotient K of correlation (stages S120, S124). The quotient K of correlation is calculated by dividing the sum of remainders by the area S, where each remainder is a remainder between the value on the vibration wave shape and the value on the shock shape model.

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10 cl, 22 dwg

FIELD: internal combustion engine.

SUBSTANCE: invention considers the operation and control of the internal combustion engine installed in vehicle. Control unit of internal combustion engine controls the rotating frequency of internal combustion engine idle run and contains the control block. Control is carried out by regulating rotation frequency of internal combustion engine according to the target rotation frequency of internal combustion engine. Target frequency is set according to working condition of the internal combustion engine and decreased when speed of a vehicle is equal or below the set value. If rotation frequency of internal combustion engine is equal or lower than threshold rotation frequency of internal combustion engine, which is lower than target frequency, rapid increase in rotation frequency of internal combustion engine is carried out. Rapid increase in rotation frequency of the internal combustion engine is made to prevent reduction of rotation frequency of the internal combustion engine. The control block defines vehicle movement on a road surface with low friction factor. During movement on a road surface with low friction factor, in case of switching the internal combustion engine to idle run, the control block reduces target rotation frequency of the internal combustion engine. Reduction of the threshold frequency is made to prevent the reduction of rotation frequency of the internal combustion engine. Also the invention describes the rotation frequency control method of the internal combustion engine in idle run.

EFFECT: ability to stop the vehicle within a short time.

10 cl, 22 dwg

FIELD: internal combustion engine.

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3 cl, 12 dwg

FIELD: engines and pumps.

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FIELD: engines and pumps.

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EFFECT: higher reliability due to observing carbonisation.

6 cl, 1 dwg

FIELD: engines and pumps.

SUBSTANCE: invention relates to automotive industry, particularly, to operation of automotive ICE. In said carb ICE, fuel, gasoline or ethanol (E85) is injected by at least one injector directly combustion chamber. Note here that said carb engine may be operated on has, particularly, on CNG (Compressed Natural Gas) and LPG (Liquefied Petroleum Gas). Note also that I operation on fuel for carb engines, index of fuel adaptation is continuously defined. Current index of adaptation in operation of fuel for carb ICE is entered into memory while on termination of preset period of running on gas, current index of adaptation of mix in operation on fuel for carb engine is compared with said entered index of mix adaptation. In case the difference between current and memorised indices of mix adaption exceeds preset value, fuel injectors are blown.

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6 cl, 1 dwg

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30 cl, 15 dwg

FIELD: engines and pumps.

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15 cl, 5 dwg

FIELD: engines and pumps.

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6 cl, 2 dwg

FIELD: engines and pumps.

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20 cl, 37 dwg

FIELD: engines and pumps.

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2 dwg

FIELD: mechanical engineering; engines.

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EFFECT: enlarged capabilities of system under dynamically changing conditions.

1 dwg

The invention relates to engine and can be used in the control system of gas injection in an internal combustion engine

The invention relates to mechanical engineering, in particular to systems that supply gas of the internal combustion engine

The invention relates to engine, and in particular to systems for controlling the supply of fuel in internal combustion engines
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