RU2797732C2 - Method and device for control of diesel internal combustion engine or dual-fuel internal combustion engine operating in diesel internal combustion engine mode - Google Patents

Abstract

FIELD: internal combustion engines.

SUBSTANCE: method of operating a diesel internal combustion engine (1) can also be carried out on a dual-fuel internal combustion engine (1) operating in the diesel internal combustion engine mode. The operating internal combustion engine (1) is fed with lubricating oil from the oil circuit (3). The measured total base number parameter and/or the measured viscosity parameter of the lubricating oil actually used for lubrication are recorded. Depending on the measured total base number parameter and/or the measured viscosity parameter, the volume of lubricating oil to be replaced in the oil circuit (3) is determined. The lubricating oil actually used for lubrication is taken from the oil circuit (3) in the amount corresponding to the volume of the oil being replaced. New lubricating oil is added to the lubrication circuit (3) in an amount corresponding to the volume of the oil being replaced. The measured viscosity parameter of the lubricating oil actually used in the oil circuit (3) for lubrication is recorded by means of a second sensor (7). A device (12) for controlling the operation of a diesel internal combustion engine (1) or a dual-fuel internal combustion engine operating in the diesel internal combustion engine mode is disclosed.

EFFECT: maintaining the necessary lubricating properties of the oil in the oil circuit without the need for a complete replacement of the engine oil.

6 cl, 1 dwg

Description

The invention relates to a method for operating a diesel ICE (internal combustion engine) or a dual-fuel internal combustion engine operating in the diesel ICE mode. The invention also relates to a device for controlling the operation of a diesel internal combustion engine or a dual-fuel internal combustion engine operating in diesel internal combustion engine mode.

The present invention relates in particular to the field of so-called. large-capacity engines or large-capacity internal combustion engines with cylinders whose piston diameter is more than 140 mm, in particular more than 175 mm. Such large-capacity internal combustion engines are, for example, marine engines.

Internal combustion engines must be lubricated with lubricating oil during operation. At the same time, lubricating oil is subject to operational aging. Lubricating oil aging can cause the oil to lose its lubricating properties and damage the internal combustion engine. This must be prevented.

In large engines, as a rule, part of the lubricating oil enters the combustion chamber of the cylinders and burns there together with the fuel being burned. Such an operationally dependent consumption of lubricating oil is compensated for by periodically adding lubricating oil to the oil circuit, in particular if the combustion of lubricating oil in the cylinders is too great.

The consumption or combustion of lubricating oil in the cylinders and the addition of new lubricating oil to compensate for this consumption of lubricating oil in conventional large-displacement internal combustion engines maintains the necessary lubricating properties of the oil in the oil circuit without the need for a complete oil change in the internal combustion engine, which would be a very laborious process.

However, the combustion of lubricating oil in the cylinders results in high exhaust gas emissions. Increasing the requirements of the technical emission standards should prevent the burning of lubricating oil in the cylinders. This will reduce the need to replenish burned-out lube oil in conventional large displacement engines. Therefore, in internal combustion engines with the lowest possible combustion of lubricating oil in the cylinders, in order to reduce exhaust gas emissions, it is necessary to carry out a complete oil change in the event of progressive aging of the lubricating oil.

Therefore, even in these more modern internal combustion engines, in which only a small amount of lubricating oil is burned in the cylinders, it is necessary to be able to dispense with a complete oil change.

Based on this, the present invention is based on the task of providing a method and a control device for operating a diesel internal combustion engine or a dual-fuel internal combustion engine operating in diesel ICE mode.

This problem is solved by means of a method for operating a diesel internal combustion engine or a dual-fuel internal combustion engine operating in the diesel internal combustion engine mode according to paragraph 1 of the claims.

According to the invention, the total base number parameter and/or the viscosity parameter are fixed in the oil circuit of the lubricating oil actually used for lubrication. Depending on the total base number parameter and/or depending on the viscosity parameter, the volume of lubricating oil to be replaced in the oil circuit is determined. The actually used lubricating oil is taken from the oil circuit in the amount corresponding to the volume of the oil being replaced. Next, lubricating oil is added to the oil circuit in an amount corresponding to the volume of oil being replaced. The present invention proposes for the first time to record metrologically the total base number (TBN) and/or the viscosity of the lubricating oil used. Depending on the correspondingly fixed parameter, the volume of oil replaced in the internal combustion engine is determined, which is replaced in the internal combustion engine. The volume of oil to be changed is then purposefully withdrawn from the oil circuit, whereby new lubricating oil is added to the oil circuit in an appropriate volume. In this way, the consumption of lubricating oil is simulated without consequences for exhaust gas emissions. The lubricating oil withdrawn from the oil circuit is collected in a storage tank and then disposed of or reused. Thus, even in internal combustion engines with a low, structurally determined combustion of lubricating oil in the cylinders, a complete oil change can be dispensed with.

In one of the improved embodiments of the invention, the parameter of the total base number and the viscosity parameter in the oil circuit of the lubricating oil actually used for lubrication are fixed, and depending on the fixed parameter of the total base number and depending on the fixed viscosity parameter for the oil circuit, the volume of the replaced lubricating oil is determined. Determining the volume of lubricating oil to be changed depending on both parameters, as well as depending on the total base number, as well as depending on the viscosity of the oil is particularly advantageous, especially for the preferred determination of the volume of lubricating oil to be replaced in a diesel internal combustion engine or operating in diesel mode. ICE dual-fuel internal combustion engine.

In one of the improved embodiments of the invention, for the oil circuit, the characteristics or characteristic curves determine the amount of oil to be replaced depending on the set parameter of the total base number and / or on the set viscosity parameter. Determining the amount of oil to be changed from characteristics or characteristic curves can be realized in a particularly simple way. For different reference points of the parameters of the total base number and/or viscosity, the volumes of the replaced oil are entered into the memory, and, if necessary, the different parameters are interpolated.

The device for controlling the operation of an internal combustion engine or an internal combustion engine operating in the internal combustion engine mode is defined in paragraph 6 of the claims.

Preferred modifications of the invention are disclosed in the dependent claims and the following description. Examples of embodiments of the invention are disclosed without limitation on the basis of a single figure, which shows a diagram of an internal combustion engine.

The invention relates to a method and device for controlling the operation of an internal combustion engine or a dual-fuel internal combustion engine operating in the internal combustion engine mode.

In FIG. 1 shows a highly simplified diagram of an internal combustion engine 1 with several cylinders 2 and an oil circuit 3. The oil circuit 3 is designed to supply lubricating oil, in particular to cylinder 2 of the internal combustion engine 1, the lubricating oil being supplied to cylinder 2 of the internal combustion engine 1 via a pre-starter 4 and discharged via return line 5.

Within the framework of the present invention, it is proposed to fix the parameter of the total base number (TBN) and / or the viscosity parameter of the lubricating oil actually used for lubrication in the oil circuit 3. The parameter of the total base number of the lubricating oil actually used in the oil circuit 3 is fixed by the first sensor 6. The viscosity parameter of the lubricating oil actually used in the oil circuit 3, the lubricating oil is fixed by the second sensor 7.

Sensors 6 and 7 are randomly located in the oil circuit 3. Both sensors 6 and 7 can also be installed together in a common module.

Depending on the fixed parameter of the total base number and/or depending on the fixed parameter of the viscosity for the oil circuit 3, the volume of lubricating oil to be replaced is determined. To do this, both sensors 6 and 7 transmit the corresponding parameter to the control device 12, which, depending on the total base number parameter and/or depending on the viscosity parameter, determines the amount of lubricating oil to be replaced for the oil circuit 3.

According to the invention, actually used lubricating oil is withdrawn from the oil circuit 3 in a volume corresponding to the volume of oil being replaced, then new lubricating oil is added to the oil circuit 3 in a volume corresponding to the volume of oil being replaced. The control device 12 then determines the control values, depending on which the oil is changed.

In FIG. 1 shows, for example, the first valve 8, which receives control commands from the control device 12 directly or indirectly via an intermediately connected additional control device for taking lubricating oil from the oil circuit 3 in a volume corresponding to the volume of the oil being replaced, and for collecting it in the storage tank 10. In FIG. 1 also shows an additional valve 9, which also receives control commands from the control device 12 to supply the oil circuit 3 with new lubricating oil from the filling tank 11.

Thus, the invention proposes to withdraw from the oil circuit 3 a certain volume of lubricating oil actually used in the oil circuit 3 for lubrication, depending on the measured total base number parameter and/or on the measured viscosity parameter, and replace it with a new lubricating oil, in particular, in the amount determined depending on the respective measured parameter.

Thus, oil consumption in cylinders 2 is simulated by constantly adding a certain amount of lubricating oil to be replaced in order to maintain the lubricating properties of the oil and to prevent a complete oil change in internal combustion engine 1.

The amount of lubricating oil to be changed in the oil circuit is determined depending on the measured total base number parameter and/or on the measured viscosity parameter, preferably from characteristics or characteristic curves. In this case, the characteristic or characteristic curve is stored in the memory of the control device 12. For different reference points of the measured parameters, the volumes of the lubricating oil to be replaced are stored in the memory. The individual reference points are interpolated or also extrapolated.

The method is used in diesel internal combustion engines or in internal combustion engines operating in the diesel internal combustion engine mode. In particular, the volume of lubricating oil to be replaced is determined as a function of both measured parameters, i.e. depending on both the total base number and the viscosity of the lubricating oil. This technique is particularly preferred for both diesel internal combustion engines and dual-fuel internal combustion engines operating in diesel combustion mode.

The invention also relates to a control device 12 for carrying out the method. The control device is designed to provide the specified method with control commands. For this, the control device 12 has data interfaces for exchanging data with various constructive groups involved in the implementation of the method according to the invention, in particular with sensors 6 and 7 and valves 8 and 9. The control device 12 also has a data processor and a data recording module in as hardware design groups. The control device 12 also has software tools, which are software constructive elements that ensure the implementation of the method according to this invention.

The control device 12 receives from the corresponding sensor 6, 7 the corresponding measured value, preferably the measured TAN value from the sensor 6 and the measured viscosity value from the sensor 7. The control device 12 determines the amount of lubricating oil to be changed depending on the respective measured value. Depending on the amount of lubricating oil to be replaced, the control device 12 provides setpoint signals for an oil change, during which the oil actually used for lubrication is taken from the oil circuit 3 and new lubricating oil is added to the oil circuit 3.

This applies, in particular, to the so-called. large-capacity engines or large-capacity internal combustion engines, the diameter of the pistons in the cylinders of which is more than 140 mm, in particular more than 175 mm. Such large-capacity internal combustion engines are, for example, marine engines made in the framework of the invention in the form of diesel internal combustion engines or in the form of dual-fuel internal combustion engines operating in the diesel internal combustion engine mode. In such internal combustion engines, in particular, gaseous fuels, such as natural gas, or liquid fuels, such as methanol, are burned as fuel.

List of symbols

1 - internal combustion engine

2 - cylinder

3 - oil circuit

4 - pre-launch

5 - return line

6 - sensor

7 - sensor

8 - valve

9 - valve

10 - storage tank

11 - filling tank

12 - control device.

Claims (17)

1. The method of operating a diesel internal combustion engine (1) or a dual-fuel internal combustion engine operating in a diesel internal combustion engine (1), - moreover, the operated internal combustion engine (1) is fed with lubricating oil from the oil circuit (3), - moreover, the measured parameter of the total base number and / or the measured parameter of the viscosity of the lubricating oil actually used for lubrication is fixed, - moreover, depending on the measured parameter of the total base number and / or on the measured parameter of viscosity, the volume of lubricating oil replaced in the oil circuit (3) is determined, - moreover, the lubricating oil actually used for lubrication is taken from the oil circuit (3) in a volume corresponding to the volume of the oil being replaced, - moreover, new lubricating oil is added to the lubrication circuit (3) in an amount corresponding to the volume of the replaced oil, - moreover, the measured viscosity parameter of the lubricating oil actually used in the oil circuit (3) for lubrication is recorded by means of a second sensor (7). 2. The method according to claim 1, characterized in that in the oil circuit (3) the measured parameter of the total base number and / or the measured parameter of the viscosity of the lubricating oil actually used for lubrication are recorded, depending on the measured parameter of the total base number and / or on the measured The viscosity parameters determine the amount of lubricating oil to be replaced in the oil circuit (3). 3. The method according to claim 1 or 2, characterized in that the measured parameter of the total base number actually used in the oil circuit (3) for lubrication of the lubricating oil is fixed by means of the first sensor (6). 4. The method according to any one of paragraphs. 1-3, characterized in that the volume of oil replaced in the oil circuit (3) depending on the measured total base number parameter and/or the measured viscosity parameter is determined from characteristics or characteristic curves. 5. Device (12) for controlling the operation of a diesel internal combustion engine (1) or a dual-fuel internal combustion engine operating in the diesel internal combustion engine mode (1), - moreover, from the sensor (6) the measured parameter of the total base number and / or from the sensor (7) the measured parameter of the viscosity of the lubricating oil actually used for lubrication of the internal combustion engine enters the control device (12), - moreover, the control device (12) determines the volume of oil to be replaced depending on the measured total base number parameter and/or on the measured viscosity parameter, - moreover, the control device (12) issues a setting signal, depending on which the lubricating oil actually used for lubrication is taken from the oil circuit in an amount corresponding to the specified volume of oil to be replaced, - moreover, the control device (12) issues a setting signal, depending on which new lubricating oil actually used for lubrication is added to the oil circuit in an amount corresponding to the specified volume of oil to be replaced, - moreover, the measured viscosity parameter of the lubricating oil actually used in the oil circuit (3) for lubrication is recorded by means of a second sensor (7). 6. The control device according to claim. 5, characterized in that it is designed to provide control over the implementation of the method according to any one of paragraphs. 1-4.

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