JP2000213322A - Cylinder lubricating method and system, and connection member for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cylinder lubricating method and system, and a connection member for an internal combustion engine. SOLUTION: The cylinder 1 of an internal combustion engine is lubricated by at least one lubricating unit 10 for supplying lubricating oil to at least one lubricating place of a cylinder. An electronic control unit 17 actuates the unit 10 based on a measured value of variable cylinder pressure of the cylinder during one or more engine cycles in the present action mode of the engine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to lubrication of cylinders of internal combustion engines, wherein at least one lubrication unit for supplying lubricating oil to at least one lubrication point of the cylinder is electronically controlled by an associated control unit. About the method.

[0002]

2. Description of the Related Art Such a method is known from the applicant's Danish patent 1119/96. In this patent, the lubrication unit has an actuator piston that drives several dosing pistons in a common operation to lubricate a number of lubrication points on the cylinder each time the lubrication unit is operated by the electronic control unit. The hydraulically driven lubrication unit operates at high speed and supplies lubricating oil to lubricating points at an advantageously high lubricating oil pressure.

[0003] It has been a desire for many years to deliver lubricating oil into the cylinder as the piston passes through the lubrication points. For example, Danish Patent No. 81 of 1954
No. 275, Swiss Patent No. 406 735 of 1966.
No. 2,827,626, 1979,
And EP 0 678 152, 1997.

[0004] In practice, it has been found that this desire is extremely difficult to achieve due to a number of factors which affect the actual time of lubrication. Some examples can be given. The delay between the operation of the lubrication unit and the delivery of the lubricating oil at the lubricating point depends, inter alia, on the viscosity of the lubricating oil. The actual delay is an absolute time interval, and the delay for proper lubrication varies according to the engine speed. Known electronically actuated units operate based on the angular position of the crankshaft. In operation, the crankshaft will twist more or less depending on the current load on the engine and the distance of the cylinder in question from the signaling device that detects the rotational movement of the shaft, causing a variable source of uncertainty. It will be introduced during lubrication.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to improve the delivery of lubricating oil to at least one lubricating point of a cylinder.

[0006]

SUMMARY OF THE INVENTION In view of this object, the Applicant's method provides for the operation of a lubrication unit during one or more engine cycles by controlling the varying cylinder pressure in the cylinder during operation of the engine. The electronic control unit is controlled based on the measured value.

The basis for enabling the delivery of lubricating oil over very short periods of time as the piston passes through one or more lubrication points by measuring the actual cylinder pressure in the cylinder. Provide the true aspect of current piston operation. The measurements provide the electronic control unit with information about when the piston passes through the lubrication points and the time interval between each pass. Based on these data, and any stored information about the delay between the delivery of the desired dosing volume and the actuation signal and the delivery of the lubricating oil to the actual lubrication point, the control unit will perform the next actuation. Calculate when to provide a signal. When the engine is running in an operating mode associated with lubrication,
As the changing cylinder pressure is measured, the current data is continuously updated and thus continuously adapted to the operating time according to the current movement of the piston in the cylinder.

[0008] While cylinder pressure can be measured by techniques well known in the art, such as strain gauges mounted on cover studs on the cylinder cover, such measurements of the overall pressure level in the cylinder are based on the current value of the piston. It only shows position and movement relatively roughly.

[0009] Preferably, pressure fluctuations caused by the passage of a piston ring provided on the piston through the pressure measuring point in the cylinder are measured at the pressure measuring point in the cylinder, and the measured values of these pressures are measured. Used in connection with controlling the operating time of the lubrication unit. As the piston ring passes through the pressure measuring point, a distinctive pressure change occurs, which is local in the area immediately around the piston ring. This provides a very accurate measurement of the current position of the piston, and thus
The control unit provides an accurate starting point for determining the operation of the lubricating oil unit.

In a particularly advantageous embodiment according to the invention, the changing cylinder pressure and lubricating oil pressure are measured at the lubrication points. This offers many advantages. The measurement provides information about the cylinder pressure at the lubrication point, thus eliminating the need for the control unit to compensate in time for movement of the piston between the measurement point and the lubrication point. The correction by time changes according to the engine speed. In addition, the same measurement point provides information about the exact time of lubrication delivery at the lubrication point. This is because the delivery clearly increases the measured pressure.
Such a measurement of the actual timing of the delivery of lubricating oil eliminates the well-known problem of estimating the change in delay between operation of the lubricating unit and the arrival of the lubricating oil at the lubrication point.

Another advantage is that between the pressure sensor and the gas in the cylinder there is a cooling effect and there is a sufficient amount of lubricating oil to properly equalize the operating conditions of the pressure sensor. In addition, the supply of the lubricating oil provides a cleaning effect in the area around the pressure sensor, and ensures that any residual combustion products that have adhered to the pressure sensor are removed.

The operation of the lubrication unit suitably depends on the current operating state or mode of operation of the cylinder. The monitoring of the operating state is based on known systems such as anti-scuffing systems and / or based on the selected operating temperature of the cylinder, but preferably during the operating period, during the operating period. To operate the lubrication unit a smaller number of times than the number of engine cycles of the engine and to analyze the operating condition of the piston ring based on the measured pressure during the engine cycle when the lubricating unit is inactive. The measurement data is supplied to the control unit. If lubrication is performed at the right time with respect to movement of the piston, the pressure sensor located at the lubrication point cannot measure pressure data that can be used to determine the operating state of the ring during an engine cycle involving lubrication. This is because lubrication "drops" small pressure changes where the pressure rise is indicative of an operational problem.
s) ". By not lubricating the cylinders during every cycle of the engine, pressure measurements from engine cycles without lubrication can be applied to the analysis of piston ring operating conditions. The longer the interval between each operation of the lubrication unit, the greater the volume of lubricating oil per operation, which allows for more efficient distribution of large amounts of lubricating oil around the circumference of the cylinder. Therefore, good lubrication can be obtained.

By monitoring operating conditions, reference data for changing cylinder pressure indicative of normal operating conditions of the cylinder can be stored in the control unit during operation of the engine. When a new engine is started, reference data for each cylinder can be recorded and stored, so that these data can be used to determine whether the currently measured operating data indicates normal operating conditions, Can be used later as a basis for comparing or indicating abnormal operating conditions that require changing operating parameters, such as increasing the dose of the drug. Since the reference data is established for each cylinder based on its actual operating state, even slight deviations from normal operation can be ascertained. Thus, by monitoring the operating condition, a warning can be issued about the abnormal operating condition much earlier than in prior art anti-damage systems based on detecting an abnormal rise in cylinder wall temperature.

Preferably, the reference data on the normal operating state of the cylinder is updated by the control unit,
Compensate for long-term changes in cylinder pressure fluctuations caused by normal cylinder wear. Can be done regularly. Such an update improves the possibility of the control unit detecting small deviations from normal operating conditions.

By monitoring the operating conditions, an automatic warning is given as to whether the pressure drop across the individual piston rings is normal, ie indicates normal operation. Furthermore, if desired, a very advantageous monitoring of whether the piston ring rotates about the longitudinal axis of the piston can be obtained. This includes reference data on the transient changes in cylinder pressure that occur as the ring gap of the piston ring periodically passes through the pressure measurement point in the control unit reference data on the normal operating state of the cylinder. This is because it can be done. Based on this, the operating condition monitoring can record the rotational frequency of each piston ring, and if the frequency of the piston ring decreases during continuous operation of the engine, the control unit will give an indication that the piston ring has seized in the associated annular groove. Signal can be given.

[0016] Preferably, the control unit temporarily dispenses more lubricating oil when the measured value of the changing cylinder pressure indicates an abnormal operating condition for the cylinder including the piston, the piston ring, or the cylinder liner. Control the lubrication unit for dosing. In many cases, a temporary overdose of the lubricating oil is sufficient to re-establish normal operating conditions. If an indication of a deviation from the normal operating state is indicated, the control unit can inform the control staff or the central control unit that the operating state has changed. As a result, a warning to inspect the cylinder and possibly repair it can be issued very early, and any replacement part can be ordered based on the warning, and an inspection plan can be made. For engine cylinders, this makes it possible to perform an inspection based on the actual operating conditions of the cylinder, instead of a regular periodic inspection. Inspections are necessary for preventive inspection when the control unit indicates a possible operational failure in the future that can be prevented by early involvement, or because a cylinder has been reported to have actually failed. One of the tests.

Conventionally, lubricating oil dosages have been determined based on running experiments from many engines in normal continuous operation at the maximum continuous rating (100% engine load), with a predetermined minimum lubricating oil dosage. Set by quantity. These standard dosages are sufficient to compensate for variations in lubrication due to manufacturing tolerances of the lubrication system and cylinder members.

The present invention provides a suitable possibility to save a great deal of lubricating oil consumption, wherein the control unit determines that the measured changing cylinder pressure causes the cylinder operating conditions to deviate from normal operating conditions. The required minimum dose of lubricating oil to the cylinder is automatically detected by reducing the lubricating oil dose to the cylinder until it indicates that it has begun. Thus, the minimum dose for the cylinder in question is the dose used during the appropriate period before departure from normal operating conditions occurs.

By varying the dosing volume for each operation and operating the dosing unit at a particular frequency with respect to the engine cycle, a lubrication unit with a regulated volume can be used. In another aspect, a lubrication unit that dispense the same volume for each operation can be used, and the amount of lubricating oil delivered by the lubrication unit is varied by changing the number of engine cycles that pass between each operation of the lubrication unit.
This mode of operation of the lubrication unit offers the advantage that the dosing volume for the individual operations is sufficient for a good distribution of the lubricating oil in the cylinder.

[0020] In an optional further development, the control unit comprises:
Has information about a number of standard groups of engine cycles,
Operate the lubrication unit once for each group. Also, by varying the composition of a series of standard groups of engine cycles, the amount of lubricating oil dispensed by the lubrication unit is varied. For example, there are standard groups of engine cycles, such as 3, 4, 5, and 6, etc., in each of which a lubrication unit is operated once, for example, over a running period of 500 engine cycles. By selecting an appropriate combination of standard groups, the dosage volume can be varied continuously. For example, if only a standard group that operates once every four engine cycles is used in the operation mode, a standard group including five engine cycles is added after every fourth standard group consisting of four engine cycles. By choice, the dosage can be reduced. As for the control technology, this is very simple in managing the control unit.

[0021] There are only a few requirements for the machinery and equipment, and thus the cost of equipping the engine,
This is particularly advantageous when improving an existing engine that is not provided with a device for detecting rotational movement of a crankshaft. The method according to the invention is characterized in that the control unit activates the lubrication unit at any time during the cycle of the engine during operation of the engine, and the control unit determines that during the upward stroke of the piston, the ring pack of the piston faces the lubrication point. The operation timing of the lubrication unit is adjusted based on the measured value of the changing cylinder pressure in the cylinder during the engine cycle so that the lubricating oil sometimes flows out of the lubrication point. After a very short period of operation, the control unit knows when the piston passes through the lubrication point, based on the measured values of the changing cylinder pressure, and then the lubricant is delivered when the piston passes through the lubrication point. As such, the operation of the lubrication unit can be adjusted in a simple manner.

The present invention further provides a cylinder lubrication system for an internal combustion engine having at least one lubrication unit for supplying lubricating oil to at least one lubrication point of the cylinder and a control unit for electronically controlling the lubrication unit. About. The cylinder lubrication system includes at least one pressure sensor for measuring a changing cylinder pressure in the cylinder, and the control unit includes a data input unit that outputs pressure measurement data on the pressure change in the cylinder at the pressure sensor. It is characterized by accepting through. This system allows data to be collected for the purpose of analyzing the operating condition of the cylinder and for adjusting the operation of the lubrication unit which can be used to obtain the above-mentioned advantages. The pressure sensor can advantageously be arranged on the side of the cylinder and can measure the pressure in the area of the running surface through which the piston ring passes during each engine cycle, and the local pressure change around the piston ring is determined for each individual ring. Provides information about operating conditions.

In a suitable embodiment, the control unit comprises a neural network and / or a neural network for processing the pressure measurement data.
Or an automatic self-learning type program having an information processing function such as a comprehensive algorithm or fuzzy logic. Based on measured data from the working cylinders and predetermined information on typical error information, such programs can detect small deviations from normal operation and give early warning of initial error information Can be.

Further, the present invention relates to a connecting member for attaching to a lubricating point of a cylinder of an internal combustion engine, the connecting member being formed in a housing for insertion into a bore of a cylinder wall, and formed in the housing; The present invention relates to a connection member including a channel provided with a check valve extending from a connection portion for a lubrication pipe to a delivery opening at a lubrication point and opening toward the delivery opening. The coupling member is characterized in that the pressure sensor is in communication with a channel section extending from the check valve to the delivery opening. When the connecting member is mounted on the cylinder, the pressure sensor is thus in permanent communication with the area located inside the cylinder at the lubrication points. The pressure sensor can be incorporated in the housing of the connecting member.

The present invention will be described in detail below with reference to the accompanying schematic drawings.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A cylinder 1 of an internal combustion engine shown in FIG. 1 has a cylinder liner 2, a cylinder cover 3 having an exhaust valve 4, and a piston 5 attached to the top of a piston rod 6. On the outer surface of the piston, a number of annular grooves for mounting the piston ring 7 are provided. The number of piston rings varies according to the type of engine, but typically at least three and at most six piston rings are provided. For proper sealing, the ring must be able to move in the associated annular groove and the movement of the ring usually involves a vertical displacement in the annular groove and a longitudinal axis 8 of the piston. Both center rotations are included.

The cylindrical inner surface of the cylinder liner 2 forms a running surface 9 for a piston ring. The lower end of this running surface is located at the lower edge of the lowest piston ring when the piston is at the bottom dead center, and the upper end of the running surface is the uppermost when the piston is at the top dead center. Is located at the upper edge of the piston ring. The piston ring and the cylinder liner function properly only when the lubricating oil is continuously and properly supplied to the running surface. In crosshead engines, the intermediate bottom separates the sump of the bedplate from the cylinder, so that, for example, the applicant's German patent DE-A 1974395.
It is necessary to separately lubricate the cylinders with a lubrication unit 10 of the type described in No. 5. In this German patent, an electronically actuated hydraulically driven actuator drives a number of dosing pistons in one common delivery stroke,
Alternatively, for example, EP-B 0 678 15
As described in No. 2, a mechanically driven pump is combined with the electronic device to discharge each dose volume of lubricating oil.

The lubrication unit 10 can supply lubricating oil to several lubrication points 11 of the same cylinder or several cylinders. When supplying lubricating oil to several cylinders, the lubricating unit is operated in a timely manner for each of the one and the other cylinders. Large engines typically have at least one lubrication unit per cylinder, and lubrication points connected to the lubrication units are typically located at the same longitudinal position (level) on the cylinder liner. But are spaced along its perimeter. Where lubrication at several levels is desired and / or lubrication with one or more lubricating oils, typically more lubrication units are used per cylinder.

The internal combustion engine has a maximum rotational speed of 60 rpm.
275 rpm, and the output per cylinder is 3
00kw to 6000kw, and cylinder bore is 25
A low speed, two-stroke, cross-head engine that is between 100 and 100 cm and has a stroke between 90 and 300 cm is preferred. The invention can also be used advantageously with a four-stroke engine in which the cylinder is pressure lubricated.

The lubrication unit 10 is connected to a lubrication point 11 via a conduit or lubrication pipe 12. A check valve 13 is provided near the lubrication point to allow only the flow to the lubrication point and to prevent the relatively high cylinder pressure during the working stroke from spreading to the lubrication unit. When the lubricating oil is delivered to the lubricating point on the cylinder side of the check valve, the pressure of the lubricating oil becomes higher than the current pressure of the cylinder at the lubricating point. The lubrication point is, for example, when the cylinder pressure is 5 ba
It is arranged to be in the range from r to 30 bar. This allows the use of a pressure sensor with genuine zero, which measures over a relatively small pressure interval, ie a pressure sensor that does not amplify the signal.

A pressure sensor 14 (pressure pick-up) is connected between the at least one lubricating point and the associated non-return valve, which is connected to the delivery side of the non-return valve so that Measure the pressure immediately at the lubrication point. A signal line 15 from the pressure sensor 14 transmits pressure measurement data to a data input 16 of the control unit 17.
The control unit 17 makes decisions based on the measured data and any stored data during operation of the lubrication unit, and thus via a control line 18 to the lubrication unit 10 to which lubrication oil is supplied via conduit 19. Give control signal. FIG. 1 shows that the control unit 17 has two lubricating units 1.
0, indicating that both units can lubricate the same cylinder. Actuation of the lubrication unit with respect to piston movement can be timed using only a single pressure sensor 14, but preferably at least one pressure sensor is used for each lubrication unit 10. This is because this allows control of the correct function of each of the lubrication units.

For the sake of simplicity, the following description of other embodiments uses the same reference numbers as used above for the same kind of detail. FIG. 2 shows an engine cylinder according to an embodiment in which two lubrication units 10 are provided for each cylinder, and lubrication points 11 along the circumference of the cylinder are alternately connected to one and the other lubrication unit. Should one lubricating unit fail, the other lubricating unit can operate to deliver at least twice the volume of its normal lubricating oil and thus keep the cylinder in normal operation until the fault condition is alleviated. Hold in operation.

Each of the lubrication units 10 is associated with a pressure sensor 14 located at a lubrication point spaced circumferentially from each other. The lubrication points are suitably diametrically opposed to one another. When using the measurement data from the pressure sensor in the piston ring condition analysis (see below),
Since two pressure sensors are provided, an abnormal pressure sequence (devian) measured by one pressure sensor is provided.
t pressure is caused by passing through the ring gap (this is ascertained by measuring the normal pressure sequence with the other pressure sensor), or of the piston ring causing an abnormal pressure sequence to both sensors. It can be checked in a simple way whether it is due to a failure condition. Furthermore, the operational reliability is improved because two sensors are provided.
This is because correct operation of the lubrication unit 10 can be maintained even if one of the pressure sensors fails. By allowing the lubrication unit to be controlled by another control unit, such as the control unit 10 associated with another cylinder of the engine, as a backup, the operational reliability of the lubrication system can be further increased. One control unit 10 can be provided for each cylinder, or the control unit 10 can be common for a group of cylinders or for the entire engine.

The graphs shown in FIGS. 3 to 6 show the measured pressure sequence as a function of time during the compression stroke of the piston of a turbocharged two-stroke diesel engine. The pressure sensor is located at the lubrication point and adjusts the zero according to the supercharging air pressure. The piston has four piston rings. FIG. 3 shows a pressure sequence measured during an engine cycle when lubricating oil is not supplied to the measurement location. This graph has a clear peak at b, which indicates the time t1 when the uppermost piston ring passed the measurement point. Shortly thereafter, the graphs show peaks c, d, e, which characteristically show that three other piston rings have passed in the form of a small pressure rise followed by a large pressure drop. After the piston has passed upwards, the cylinder pressure at the measurement point is
It can be seen that it is hardly affected by the significantly higher pressure of the combustion chamber above the piston. If the measuring point is not located on the running surface of the cylinder, but for example to measure the pressure load acting on the cylinder cover, comprehensive data on the piston position can be obtained, but local pressure fluctuations on individual piston rings can be obtained. No statistical data is available.

FIGS. 4 to 6 show examples of pressure sequences f, g, and h measured when lubrication is performed too early, correctly, and too late. In all three cases, delivery of the lubricating oil to the lubrication point causes the pressure to increase substantially at time t2, and the passage of the first piston ring causes the pressure to decrease significantly at time t1. It is desirable to deliver the lubricating oil during a period between time t1 and time e when the lowermost piston ring passes. FIG. 5 shows such a correct timing.
Shown in

To adaptively control the timing of lubricating oil dosing with respect to passage of the piston, the measured pressure fluctuations can be used, and the control unit corrects the operation of the lubricating unit until the times t1 and t2 substantially coincide.

Preferably, the lubricating oil is delivered when at least the upper three piston rings pass the lubricating point, and the cross-sectional area of the outlet opening of the lubricating point is preferably delivered for each operation of the lubricating unit. The lubricating oil is adapted so that it can be delivered at the maximum continuous rating. When the engine is operating at low load, the piston moves more slowly through the lubrication point and the lubrication oil flow period is often not changed, so the control unit will The lubrication unit is operated with a periodical delay, for example, every second or third operation, so that delivery at the lubrication point does not start until it has passed. This provides lubrication at both the top and bottom of the piston ring pack.

If no lubricating oil is delivered when the piston passes the measuring point on the running surface, detailed data on the state of the piston ring can be obtained as shown in FIG. This is because the pressure drop when passing through each piston ring can prove that the rings are functioning properly. Because the ring rotates in the annular groove, and the ring has an inclined ring gap, and gas passes through this gap, periodic transient measurement data is generated for each ring, thereby generating pressure. Is measured. According to the measured pressure, the pressure drop across the ring is much smaller than usual. Due to the slow rotation of the piston ring, passage takes place in a recognizable path during many engine cycles.

FIG. 7 shows a pressure sequence measured during the expansion stroke of the piston. The vertical line with i indicates that the piston ring has passed below the pressure sensor exposed to the pressure in the combustion chamber. After some introductory pressure fluctuations, the pressure drops along the same path to the charge air pressure. The control unit can use this information about the pressure sequence in the correct mode of operation to adjust when to open the exhaust valve.

The electronic control unit 17 can store and analyze the collected pressure measurement data, an example of which is shown schematically in FIG. In FIG. 8, the information 20 transmitted via the signal line 15 is stored in step 21. this is,
This is probably done after removing unwanted information. In a step 22, the data is appropriately selected to determine the time t1, and in a step 23 a corresponding time t2 is determined, the control unit comparing the time t1 with the time t2 in a step 24. Thereby determining whether correction of the timing of the actual signal to the lubrication unit or the like is necessary, and then providing a control signal 25 to the lubrication unit in the desired manner. In step 24, an analysis may be performed based on predetermined criteria, possibly including one or more operating parameters of the engine, such as the current load or a given sequence for changing the load, or over-lubrication. Information on manual order to do is assisted. In FIG. 2, signal line 26 allows the control unit to accept such external signals.

FIG. 9 shows another example of the processing of the pressure measurement data by the control unit. In this figure, after removing noise and unwanted information at step 27, it can be analyzed at step 28 whether this information is suitable as reference data for cylinder pressures that change during normal operating conditions of the cylinder. . If appropriate, such information can be passed back to step 21 and stored for later use in the removal and analysis of noise and unwanted information performed in subsequent steps. The reference data can be updated and the analysis at the time of the update is made against a predetermined expected change so that the initial error condition does not enter the reference data.

The analysis in step 28 is based on an automatic self-learning type program having an information processing function, for example, neu (neu).
ral) network and / or generic
c) It can be performed by an algorithm or fuzzy logic. Such programs are well known in the art for monitoring and analyzing operating conditions. Upon delivery of the engine, the program adapts and adjusts according to the operating mode and the error mode for the cylinder of the engine in question, and after operating the cylinder, the program alive from pressure measurement data from the running engine (l
ive) By analyzing the information, a final adjustment of the program can be made and the reference data for the relevant cylinder can be determined. When this is done and the control unit is operated in normal operation, at step 29 the information for the purpose of controlling the engine can be determined and a signal for operating the lubrication unit can be provided.

The connecting member 30 shown in FIG. 10 has a connecting portion 31 for the lubricating pipe 12. This lubricating pipe communicates with the discharge opening 34 via the channel 32 of the housing 33 of the connecting member 30. The channel 32 is provided with a check valve 35 that opens toward the discharge opening. A pressure sensor 36 is disposed in association with the channel 32 between the check valve and the discharge opening. The pressure sensor is a standard component and may be made, for example, of a strain gauge. Of course, the pressure sensor can be arranged as an independent unit, but by incorporating it into the connecting member, it is protected from harmful effects and installation becomes easy. This is because it is necessary to pass the connecting member through a lubrication channel provided through the cylinder wall, which is usually the wall of the cylinder liner or both the cylinder liner and the cooling jacket.

The internal combustion engine may be a four-stroke engine or may have a cylindrical piston.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a cylinder formed in accordance with the present invention.

FIG. 2 is a schematic view of another embodiment of a lubrication system according to the present invention.

FIG. 3 is a graph of a measured pressure sequence of a cylinder during a compression stroke.

FIG. 4 is a graph of a measured pressure sequence of a cylinder during a compression stroke.

FIG. 5 is a graph of a measured pressure sequence of a cylinder during a compression stroke.

FIG. 6 is a graph of a measured pressure sequence of a cylinder during a compression stroke.

FIG. 7 is a graph of a measured pressure sequence of the same cylinder during an inflation stroke.

FIG. 8 is a schematic diagram showing a data processing sequence.

FIG. 9 is a schematic diagram showing a data processing sequence.

FIG. 10 is a side view of a connecting member according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Cylinder 2 Cylinder liner 3 Cylinder cover 4 Exhaust valve 5 Piston 6 Piston rod 7 Piston ring 8 Length axis of piston 9 Running surface 10 Lubrication unit 11 Lubrication point 12 Lubrication pipe 13 Check valve 14 Pressure sensor 15 Signal line 16 Data Input unit 17 Control unit 18 Control line 19 Conduit

 ──────────────────────────────────────────────────続 き Continuation of the front page (71) Applicant 594140904 Center Syd, 161 Stamholmen, DK-2650 HVIDOVR E, Denmark (72) Inventor Otto Winkel Daco-4000 Roskilde, Kingdom of Denmark, Frederiksberg Ave 187 (72) Inventor Ole Christensen Daco, Denmark-2800 Langview, Naargarswei 34F (72) Inventor Ole Larsler Saarensen Daco, Denmark-2625 Valle Nsweig, Engwei 9th (72) Inventor Per Åers Christoffersen Daco, Denmark-2750 Barrelp, Somerboon 75

Claims (19)

[Claims] 1. A method of cylinder lubrication, wherein at least one lubrication unit for supplying lubrication oil to at least one lubrication point of a cylinder of an internal combustion engine is electronically controlled by an associated control unit. Controlling the operation of the lubrication unit during an engine cycle of the engine by an electronic control unit based on measurements of changing cylinder pressure in the cylinder during operation of the engine. 2. A pressure fluctuation generated by a piston ring provided on a piston passing through a pressure measuring point in the cylinder is measured at a pressure measuring point in the cylinder, and the measured values of these pressures are measured. 2. The method according to claim 1, wherein the method is used in connection with controlling the operating time of a lubrication unit. 3. The method according to claim 2, wherein the changing cylinder pressure and lubricating oil pressure are measured at the lubrication points. 4. During operation, the lubrication unit is operated a smaller number of times than the number of engine cycles during the operation period, and based on the measured pressure during the engine cycle when the lubrication unit is inactive. The method according to claim 1, 2 or 3, wherein pressure measurement data is supplied to the control unit for analyzing the operating state of the piston ring. 5. The method of claim 4, wherein reference data for changing cylinder pressure indicative of normal operating conditions of the cylinder is stored in the control unit during engine operation. 6. The control unit updates the reference data for normal operating conditions of the cylinder,
6. The method according to claim 5, wherein the changing cylinder pressure compensates for long-term changes due to normal cylinder wear.
The method described in. 7. The reference data on the transient changes in cylinder pressure caused by the periodic passage of the ring gap of the piston ring through the pressure measuring point is provided by the control unit of the control unit for normal operating conditions of the cylinder. The method according to claim 4, 5 or 6, wherein the method can be included in the reference data. 8. The control unit controls the lubrication unit to temporarily dispense more lubricating oil when the changing cylinder pressure measurement indicates an abnormal operating condition for the cylinder. The method according to claim 5, 6 or 7, wherein: 9. The control unit reduces the lubricating oil dose to the cylinder until the measured changing cylinder pressure indicates an operating condition in which the cylinder has begun to deviate from a normal operating condition. A method according to any of claims 4 to 8, characterized in that the required minimum dose of lubricating oil to the cylinder is automatically detected by the method. 10. The lubricating unit according to claim 4, wherein the amount of lubricating oil of the lubricating unit is changed by changing the number of engine cycles passed between each operation of the lubricating unit. The method according to claim 1. 11. The control unit has information for a number of standard groups of the engine cycle and operates the lubrication unit once for each group to change the composition of the series of standard groups of the engine cycle. 11. The method according to claim 10, wherein the volume of lubricating oil dispensed by the unit is varied. 12. The control unit operates the lubrication unit at any time during a cycle of the engine during operation of the engine, and the control unit operates the lubrication unit during the upward stroke of the piston. Adjusting the operation timing of the lubrication unit based on the measured value of the changing cylinder pressure in the cylinder during the engine cycle so that the lubricating oil flows out of the lubrication point when the ring pack faces the lubrication point. The method according to any one of claims 1 to 11, comprising: 13. The electronic control unit for controlling at least one other operating parameter, such as an exhaust valve opening timing, based on the measured value of the changing cylinder pressure of the cylinder during operation of the engine. 13. A method according to any one of the preceding claims, which provides a signal used for: 14. A cylinder lubrication system for an internal combustion engine, comprising: at least one lubrication unit for supplying lubricating oil to at least one lubrication point of the cylinder; and a control unit for electronically controlling the lubrication unit. At least one pressure sensor for measuring a changing cylinder pressure in the cylinder, wherein the control unit receives, via a data input, pressure measurement data on a pressure change in the cylinder at the pressure sensor. And a cylinder lubrication system. 15. The pressure sensor of claim 14, wherein the pressure sensor is located on a side of the cylinder and measures a pressure in a running surface area through which the piston ring passes during each engine cycle. The described cylinder lubrication system. 16. The lubricating oil delivery section of the lubricating unit is connected via a lubricating oil conduit provided with a check valve for shutting off the lubricating oil conduit from the cylinder pressure when the cylinder pressure exceeds the lubricating oil pressure. Is connected to the lubrication point,
The cylinder lubrication system according to claim 15, wherein the pressure sensor is disposed on the cylinder side of the check valve in association with the lubricating oil conduit. 17. The self-learning program for processing pressure measurement data, the control unit including a neural network and / or a self-learning program having an information processing function such as a comprehensive algorithm or fuzzy logic. Item 17. A cylinder lubrication system according to Item 14, 15, or 16. 18. A connecting member for mounting to a lubricating portion of a cylinder of an internal combustion engine, comprising: a housing for insertion into a bore in a wall of the cylinder; and a connecting portion formed on the housing and connected to a lubricating pipe. A coupling member including a channel extending to a delivery opening at a lubrication point and including a check valve open toward the delivery opening, wherein a pressure sensor communicates with a channel section extending from the check valve to the delivery opening. A connecting member, characterized in that: 19. The connecting member according to claim 18, wherein the pressure sensor is incorporated in the housing of the connecting member.