KR20130044224A

KR20130044224A - Dosing system for lubricating oil for large diesel engines and method for dosing cylinder lubricating oil to large diesel engine cylinders

Info

Publication number: KR20130044224A
Application number: KR1020127025978A
Authority: KR
Inventors: 페르 백
Original assignee: 한스 옌젠 루브리케이터스 에이/에스
Priority date: 2010-03-12
Filing date: 2011-03-10
Publication date: 2013-05-02
Also published as: EP2545257B1; EP2545257A1; WO2011116768A1; CN103249922B; KR101569564B1; JP2011190807A; DK177620B1; JP5266356B2; CN103249922A; DK201070098A

Abstract

For example, a dispensing system for cylinder lubricating oil for large diesel engine cylinders 5 in a marine engine 32 is described, which system comprises, for example, a central lubricating oil feeder which is a central pump station 1; A supply line 31 and a return line 33 to / from the lubrication oil feeder for circulating the lubrication oil; One or more engines 31, connected with supply and return lines via branch lines 7, 15, 16 and adapted to inject the cylinder lubrication oil 21 through the nozzle hole 20 into the associated cylinder 5. A plurality of injectors 6 corresponding to the number of cylinders in the cylinder; Open / close valve units 3 provided at branch lines 15, 16 between the injectors 6 and the supply and return lines; And a control unit 25 for controlling each open / close valve unit 3. In order to achieve flexible central control of the injection amount of oil and precise control of the timing, the open / close valve units 3 feed the first chamber 22 behind the spring-biased closing member 18 in the injectors. 31) and the system is designed to have a first inlet P and a first outlet R that can be connected to the return line 33, respectively. The injector 6 further has a second chamber 24 in front of the closing member 18 of the injector, the second chamber having a branch line 7 connecting the second chamber 24 of the injector with the supply line 31. Connected. The control unit 25 is connected at least with the open / close valve units 3.

Description

DOSING SYSTEM FOR LUBRICATING OIL FOR LARGE DIESEL ENGINES AND METHOD FOR DOSING CYLINDER LUBRICATING OIL TO LARGE DIESEL ENGINE CYLINDERS}

The present invention is:

A central lubricating oil supply, which may be configured by a central pump station or a central accumulator;

A supply line from the lubricating oil feeder;

A plurality of injectors corresponding to the number of cylinders in one or more engines, connected to the supply lines via branch lines and adapted to inject cylinder lubrication oil into the associated cylinders through one or more nozzle holes; ;

Opening / closing valve units provided at branch lines between the injectors and the supply lines; And

A control unit controlling each open / close valve unit;

A dosing system for cylinder lubricating oil from a diesel engine, for example to large cylinders in a marine engine, is included.

Furthermore, the present invention includes the steps of: applying pressure to a lubricating oil in a central lubricating oil supply, which may be configured by a central pump station or a central accumulator; Supplying lubricating oil through a supply line; Associated cylinders through a plurality of injectors corresponding to the number of cylinders in one or more engines, connected with the supply lines through branch lines and applied with one or more nozzle holes, by opening and closing the open / close valve units arranged in the branch lines. Injecting cylinder lubricating oil into the cylinder; And controlling each open / closed valve unit by a control unit; and a method for administering a cylinder lubrication oil to cylinders in a large diesel engine, such as in a marine engine.

Typically, it has been common to use lubrication devices that are mechanically connected to and driven by a crankshaft on the engine to be lubricated. These are systems in which the flexibility in changing the lubrication oil portion supplied is limited, especially if there are changes to be made while the engine is running. Many examples of cylinder lubrication systems are known which are intended to achieve a flexible and precise timing and amount for cylinder lubrication independent of an engine's crankshaft.

An example of a system for lubricating a cylinder of the aforementioned type which can be easily mounted in a large diesel engine with a plurality of cylinders is disclosed in EP 1 426 571. This system enables electronic control of the amount of oil injected depending on the needs that arise during a given situation of operation. The described system places high demands on tightness due to the high closing pressure required at the open / close valves provided from the pressure source to the branch lines between the supply line and the injectors. This is especially the case in systems where cylinder lubrication is established with injection of lubricating oil at high lubricating oil pressure, for example above 40 bar. In addition, the disclosed system places very high demands on uniform viscosity, uniform pressure, uniform temperature, uniform tube length, etc. in order to establish accurate control of the amount of lubricating oil delivered per unit time. This adds uncertainty to the precise control of timing for oil filling.

With the system according to the invention, advantages are typically achieved when operating at lower pressures, such as between 25 and 70 bar, but typically above 40 bar.

It is an object of the present invention to provide a technically simple system for the electronically controlled lubrication of cylinders in large diesel engines, whereby it is possible to achieve flexible control of the injection amount of oil and precise control of timing. In particular, it is aimed at showing a system for injecting lubricating oil for lubricating cylinders by lubrication at high lubricating oil pressures, for example above 40 bar, lubricating oil viscosity and pressure in feed lines than in the prior art systems. The goal is to show a more stable system in terms of status.

According to the invention this is achieved by a system of the type specified in the introduction, in which the injectors are connected via a second branch line with a return line to the lubricating oil feeder for circulating the lubricating oil and opening / closing it. Valve units are provided at the second branch lines between the injectors and the return line to connect with the return line, and the open / close valve units are connected to the first chamber behind the spring-biased closing member in the injectors ( a first inlet and a first outlet connecting the chamber with a supply line and a return line, respectively, the injector having a second chamber in front of the closing member of the injector, the second chamber having a second chamber of the injector Is connected to a third branch line connecting the supply line and the control unit is connected to at least the open / close valve units.

The method according to the invention is characterized in that the injectors 6 are connected via a second branch line to the return line to the lubricating oil supply for circulating the lubricating oil, and the open / close valve units are connected between the injectors and the return line. Provided in two branch lines and connected to the return line, wherein the open / close valve units pass through the first inlet and the first outlet, the first chamber behind the spring-biased closing member in the injectors, with the supply line and the return line. Each connecting, the injector having a second chamber in front of the closing member, connecting a third branch line connecting the second chamber of the injector with the supply line to the second chamber, and the control of oil administration between the injectors and the return line It is characterized in that it is performed by opening and closing the open / close valve units in the branch lines.

Thus, the system according to the invention is based on the feature that the chamber of the injectors in front of the closing member is constantly connected with the supply line such that it is under a constant feed pressure provided by the lubrication oil pump. Such a lubricating oil pump may be electrically or mechanically driven.

The chamber of the injectors behind the closing member is connected with the supply line such that the closing member is pushed against the nozzle hole by a spring so that when the injectors are closed under the same pressure as the prevailing pressure in the chamber in front of the closing member Will be.

The injector is opened by removing pressure in the chamber behind the closing member. This is affected by resetting the open / close valve units and by connecting the chamber behind the closing member with the return line. By this, the pressure in the lubricating oil in the chamber in front of the closing member will overcome the force from the spring so that the closing member is positioned away from the nozzle hole. Thereby, the injection is immediately affected by the pressure corresponding to the pressure in the lubricating oil from the start of the injection. The pressure in the feed line can typically be at least 70 bar.

The injector is closed by reestablishing the pressure in the chamber behind the closing member. This is affected by resetting the open / close valve units and by connecting the chamber behind the closing member with the supply line. Thereby, the pressure in the lubrication oil in the chamber behind the closing member will overcome the pressure in the lubricating oil in the chamber in front of the closing member with the spring so that the closing member is positioned in engagement with the nozzle hole. Thereby, the injection is stopped immediately.

The amount of oil injected is controlled by controlling the opening time of the injectors, ie the period of time during which the pressure in the chamber behind the closing member is removed. Since there is almost no consumption in the branch line between the injector and the return line to open and close the injectors, it can be controlled very accurately.

The opening time of the injectors can be derived from empirical values. These empirical values can include data on oil, pressure, flow, lubrication oil requirements, and the like, and can be stored in the control unit. This data is used to control the opening time of the injectors by controlling the movement of the open / close valve units.

The empirical values applied may possibly be corrected based on data from the measurement of oil flow rate.

The system can operate with one or two simple lubricant oil pumps. They may have a relatively low capacity because the pump capacity is only slightly larger than the maximum lubrication oil consumption of the engine. At the same time the pump energy is converted to the heating of the lubrication oil and the open / close valve units.

The system can be used for various types of cylinder lubrication, such as SIP lubrication (eg described in WO 0028194), spray lubrication, spray lubrication with one or more oil jets per injector (eg in EP 1 350 929). Intended), pulsejet lubrication (such as described in brochures from Wartsila), or combinations thereof. When a system is described on the basis of a specific application area, such as SIP lubrication, this should not be considered as a limitation of the present system, but merely as an example of the specific benefits achieved by the present system.

All vulnerable functions such as stroke setting, over-pressure valves for SIP valves with monitoring, and function sensors are unnecessary. The only elements remaining are two interconnected solenoid valves, possibly a simple volumetric meter, for example in the form of an oval wheel meter.

It is noted that the system according to another embodiment can be designed without a volume meter. Empirical work (or configuration-specific work by installation) determines the association between the amount of lubrication oil transferred for the system and the "opening times". There is no need for volumetric or flow measurement here.

In such a system without a volumetric meter, tubing, valves, pumps and the like will preferably be designed to ensure a constant temperature of lubrication oil / tubing.

At the same time, it is assumed that there is only a pressure drop over the needle guide when the valves are opened, reducing the sensitivity of the SIP valves to micro-particles in the lubricating oil. Since the closing pressure will always be higher, none of the valves will be at risk of opening to the cylinder pressure.

The requirements for tolerance and fit between the closing member / needle and the chamber / guide can be reduced so that the injectors can be simplified, and their influence on the amount of lubricating oil can be largely ignored. Because there is.

According to a further embodiment of the invention, the dosing system comprises a branch line connecting the second chamber of the injector with the supply line, the volumetric device being arranged to measure the volume of lubricating oil added per cylinder, and the control unit with the volumetric meter. It is characterized in that it is connected.

According to a further embodiment of the invention, the method is characterized in that the volume measurement of the amount of lubricating oil supplied per cylinder is carried out in a branch line connecting the second chamber in front of the closing member of the injector with the supply line.

The injector chamber, from which injection is carried out, is supplied with lubricating oil through a volume meter inserted into the supply line and a common tube connecting it.

This makes it possible to measure the oil volume supplied for each cylinder and to determine the injection time for a given oil consumption. Preferably, the amount of oil supplied per cylinder is measured by a volumetric meter, for example in the form of an elliptical wheel gauge. The time for injection can be adjusted through a Proportional-Integral-Derivative (PID) control loop. This is a closed-loop adjustment where compensation for possible measured deviations is made.

Volumetric meters are used simultaneously to monitor the function of the administration system. If no consumption is seen, something is wrong. If the consumption exceeds the expected value, the injector may be leaking or blocked.

Other alarm functions that can be monitored through detectors and detected by the control unit are wrong oil pressure, too high counterpressure in the filter, too high or low oil temperature, or computer-related errors. The control unit comprises a computer based electronic control system which can have expansion cards for engines with eight or more cylinders.

A backup system may also be provided that includes duplication of readily exchangeable units, injectors, open / close valve units, computer prints, etc. or functions. For example, large engines can be divided such that there are two computers, two open / close valve units, two transmitters, and two networks. One system controls all other injectors in the cylinder, and the other system controls the other injectors. In case of an error, the faulty system is stopped and the other system continues with a double amount until the error is corrected.

According to another embodiment, the method is characterized in that an empirical determination of the association between the opening time and the amount of lubricant oil transferred is established for the system, and this data is stored in the control unit and used to control oil administration. There is a characteristic.

The system can be designed without volumetric / volume measurements. Empirical work (or construction-specific work by installation) determines the association between the amount of lubricant oil transferred for the system and the "open time." There is no need for volumetric or flow measurement here.

In such a system without a volumetric meter, tubing, valves, pumps and the like will preferably be designed to ensure a constant temperature of the lubricating oil / tubing.

According to a further embodiment of the invention, the dosing system is adapted such that the first and second chambers of the injectors are connected with the supply line in the closed state of the injector and the first chamber of the injectors is connected with the return line in the open state of the injector. It is characterized in that the open / close valve unit is connected. Thus, by means of a tube system for each engine cylinder, a plurality of injectors are connected to an open / close valve unit connected to the return oil side of the injectors via a common tube.

According to a further embodiment of the invention, the method comprises the first and second chambers of the injectors respectively formed before and after the closing member of the injector in the closed state of the injector are connected with the supply line and the injectors in the open state of the injector. It is characterized in that the first chamber is connected with the return line.

According to a further embodiment of the invention, the administration system is characterized in that one open / close valve unit and one volume meter (if a volume meter is used) are provided for all injectors installed in one cylinder. . This enables the simplification of the design of the dosing system and also simplifies the control compared to the system in which the open / close valve unit and the volumetric meter are installed for each injector.

According to a further embodiment of the invention, the dosing system is characterized in that the open / close valve unit is connected to the respective injectors via connecting tubes of the same length via a port. Thereby, the length of the individual tube section on the return side of the injectors is as much as possible for all the injectors, thus ensuring a uniform reaction time for the individual injectors.

According to a further embodiment of the invention, the dosing system is characterized in that the supply and return lines at the farthest end from the lubrication oil supply include a pressure valve to ensure controlled circulation of the lubrication oil. Lube oil pumps and other elements with filters and motor boards may be installed at the end of the engine or at other suitable locations.

The tube system for lubricating oil will preferably comprise a supply line for conducting the lubricating oil under pressure and a return line for returning excess lubricating oil to the lubricating oil pump, which is the longitudinal direction of the engine. It will be installed along the (longitudinal) axis. The pressure valve of the oil system is installed at the opposite end of the engine in relation to the lubrication oil pump so that the oil is continuously circulated in the entire tube system. Thereby, the pump energy is converted into the heating of the lubricating oil in the tubing and it is possible to ensure a uniform temperature. This will prevent local overheating of the oil and eliminate the need to cool the lubricating oil.

According to a further embodiment, the administration system according to the invention is characterized in that the open / close valve unit comprises at least two interconnected valves.

Thus, the open / close valve unit for controlling the pressure in the branch line connected with the return line may include two solenoid valves interconnected to separately control the open and close times.

The open / close valve unit is arranged opposite each cylinder if they remain, otherwise it is arranged between the two cylinders. They can be connected to a cylindrical pipe system through two short tubes if the cylinder is formed with pre-installed injectors and tubing for connecting these injectors. For simple detachment, hoses and connectors can be used as an alternative to the two connection tubes.

The open / close valve unit is typically two three-way connected in such a way that one valve opens for the injectors by lowering the pressure in the return lines of the injectors and the other valve again closes the injectors by applying pressure to the return lines of the injectors. Consists of solenoid valves.

The reason for using two valves is that the opening time of the injectors is only a few milliseconds depending on the amount of oil desired to be transferred by the injector. Typically commercially available solenoid valves have a much longer reaction time than required to achieve a small amount of injected lubricant oil. By applying an overlap of movement for the two valves, it is possible to achieve a very short opening time for the injectors, so even a small amount of lubricating oil using simple and cheap valves with a long reaction time It is also possible to achieve the possibility of precise transmission.

Alternatively, to adjust the amount of injected lubricating oil, it is also possible to use a fixed overlap between the movements of the two valves and to change the pressure in the supply line. This is particularly advantageous by injecting a small amount of lubricating oil.

Each open / closed valve unit and volumetric meter is connected to the computer via a shielded cable, such as an eight-pole shielded cable (two poles per solenoid ball and four poles for the volumetric meter). It is preferable. It is also possible to use one cable for power supply and one cable for signal transmission, preferably to reduce the number of conductors leading to the computer. Thus, the system can be provided with very simplified tubing and cabling.

The display can be fitted on or close to the engine. Simple functions can be set and read on it. General functions and settings are generally based on a computer located in the control room.

The amount of lubricant oil for each individual cylinder can be controlled by measuring the actual consumption, and the opening time for the open / close valve unit can be adjusted through the adjustment loop to obtain the desired amount of lubricant oil.

The lubrication time and the amount of lubrication oil are controlled by the control unit controlling each open / close valve unit based on given data and measurements stored in the control unit or measured via a sensor and transmitted to the control unit. Thus, the volumetric unit performs the monitoring function of the injectors in the individual cylinder units in that the control unit compares the expected consumption at a given pressure and temperature of the oil with the actual consumption, which will cause a deviation if the nozzle is leaking or clogging. .

According to a further embodiment of the present invention, the method comprises controlling the opening time and holding times for at least two valve elements in the open / close valve unit. As mentioned above, this offers the possibility of very simple precise adjustment even with small amounts of lubricating oil.

The control unit may form part of a computer system with a central computer for establishing control of the system according to the invention. According to a particular embodiment, the central computer includes two PCs: a main PC and a backup PC.

The control is so flexible that all current modes of operation can be applied:

rpm-dependent regulation, ie unregulated operation;

bhp-dependent regulation, ie load dependent regulation of the amount of lubricating oil;

mep-dependent control, ie cylinder pressure dependent control of lubricating oil; or

Load change dependent regulation, ie additional lubrication associated with changes in load.

Besides,

Variants of standard modes of operation;

The possibility of adjustment algorithms based in whole or in part on customer-specific data inputs such as various sensor-based data inputs (FE-content, cylinder pressure, cylinder temperature, etc.), where the inputs are applied to the entire engine or to individual cylinders Can be applied to;

The possibility of overlay modes that the user defines and describe themselves as decreasing and / or increasing percentages;

It is possible to establish a flexible control system that enables a highly user specified adjustment algorithm, including.

Control is performed with the possibility of local data collection in / in individual cylinders, and superior control is the possibility of controlling the amount of transferred lubricant oil corresponding to the expected / planned amount of lubricant oil. Is performed with.

It is possible to establish local control, whereby the user has the possibility to perform local data collection on / in an individual cylinder and to use these online data inputs to adjust the amount of feed and possible timing. For example, temperature sensors can be installed in the cylinders, flowmeters for the fuel supply for the individual cylinders can then be defined, and how control can adjust the timing and the amount associated therewith.

In addition, it is added that local information on the status for individual cylinders can be collected: for example, to achieve the possibility of checking whether the amount of lubricant oil supplied corresponds to the amount of lubricant oil expected / planned. In this way it will be possible, for example, to install flowmeters and / or temperature sensors next to individual injectors and to feed this information to the advanced control on the condition via the network.

In addition, flow measurement can be performed by alternative methods.

Instead of controlling the function through the flow meter, monitoring of the changing position of the two valve slides can be integrated. For example, one or two induction encoders may be included for each valve. These encoders detect when valve slides are in the relevant extreme position. This alternative solution can optionally be combined with installing two flowmeters each in a supply and return line directly following the pump stations. By this, it is possible to control the total consumption for the whole system.

According to a further alternative, the flowmeters can be changed from being a local unit per dosing unit, to a system in which two flowmeters are used in each of the supply and return lines directly connected to the pump station. Thereby, the total consumption for the whole system can be controlled.

In the above embodiments, it is assumed that the supply pressure for the injectors is constant. However, it is also possible to have embodiments that operate with variable working pressure in the supply line for lubricating oil. Thus, it is possible to change the working pressure depending on the current state (dosage amount, temperature, pressure in the cylinder, load on the cylinder / engine, etc.).

According to a further embodiment, a higher feed pressure may be applied to the feed line by a smaller dose so that the amount of lubricated oil dispensed better. This solution would require that the pressure-regulating valve be built in around the pump station so that stepless regulation of the supply pressure can be carried out via the control unit and in dependence on previously registered data. . Thereby, the oil to be administered can be delivered in an optimal form depending on the condition.

As in a further alternative embodiment, a technically simple solution can be made that can use an on / off solenoid valve that can automatically raise or lower the pressure level instead of the stepless pressure regulating valve.

1 shows a schematic diagram for constructing a dosing system according to the invention in an engine with a central lubricating oil feeder and five cylinders in the form of a pump station;
FIG. 2 shows a schematic diagram for constructing a valve unit with two three-way valves for use in the dosing system shown in FIG. 1, three different views for the valve unit in the closed and open states. Shown with operating positions A, B, and C;
FIG. 3 shows a diagram showing, over time, the transition of the infusion cycle when the valve unit shown in FIG. 2 is used in the dosing system shown in FIG. 1, FIG.
4 shows a side view of the valve unit;
FIG. 5 shows a side view of the valve unit shown in FIG. 4 according to the arrow VV in FIG. 4;
FIG. 6 shows a view corresponding to FIG. 1, showing a system in which a central lubricating oil supply is used in the form of a central accumulator; FIG.
FIG. 7 shows a diagram corresponding to FIG. 1, showing a system in which flow meters are used in each of the supply and return lines; FIG.
8 shows a diagram corresponding to FIG. 1, showing a system in which flow meters are used in each of the supply and return lines, with detection of the position of the valve slides; FIG.
FIG. 9 shows a diagram corresponding to FIG. 1 but showing a system operating with variable working pressure in lubricating oil; FIG. And,
FIG. 10 shows a view corresponding to FIG. 1, showing a further system operating with variable working pressure in lubricating oil. FIG.

The invention will be explained in more detail below with reference to the accompanying drawings.

The system includes a pump station 1. The cylinder lubrication oil is guided from the pump station 1 to the pressure valve 2 at the end of the engine 5 via a supply line running along the five cylinders 5 in the engine 32 under pressure. The surplus lubricating oil is led back to the pump station via the parallel return line 33. The energy of the pump is thus converted to the heating of the lubricating oil in the supply and return lines 31, 33, ensuring a reasonably constant temperature of the oil in the supply and return lines and preventing local overheating of the oil. The pump station 1 is supplied with oil through the supply line 34.

The pump station 1 has two pumps 11, two filters 12, and two for preventing lubrication oil from flowing backwards through the still-standing pump 11. Two check valves 13. The pump station also includes two shut-off valves 14 inserted into the supply line 34 so that the filters 12 can be cleaned during operation. The two pumps 11 are stand-by with respect to each other and start automatically when the oil pressure drops.

The open / close valve unit 3 having a port P connected to the supply line 31 and a port R connected to the return line 33 has a first and second branch for each engine cylinder 5. It is connected to supply and return lines 31, 33 via lines 15, 16. Each open / close valve unit 3 has a plurality of lubricating oil injectors 6 installed in the engine cylinder 5 and a port A which is connected through a common tube 8. The common tube 8 is connected with the return line 17 of the injectors (see FIG. 2). The injectors 6 are supplied with lubricating oil for injection from the supply line 31 into the engine cylinder 5 via a third branch line 7 in which a volume meter 4 is installed.

As mentioned above, the system can alternatively be designed without a volume meter. By empirical work (or installation-specific work), the correlation between the amount of lubricant oil transferred for the system and the "opening times" is determined.

The open / close valve unit 3 consists of two three-way valves V1 and V2 (typically solenoid valves) as shown in FIG. For illustration purposes only one injector 6 is shown in connection with the open / close valve unit 3. Each valve unit has two ports P connected to the supply line 31 and a port R connected to the return line 33. In addition, the two valves V1 and V2 are interconnected through ports B and C.

In addition, the control unit 25 is shown, which is connected with an open / close valve unit 3 which receives a control signal from the control unit via a connection 26, and feeds back feedback information to the control unit 3. ). Through the connection 27, the control unit 25 receives feedback information from the volumetric meter 4. These connections will be provided in number corresponding to the number of cylinders in the engine.

In addition, the control unit can be used for example for crankshafts, engine loads, pressure conditions, lubrication oil temperatures, pre-programmed data and the like for feedback signals and for alarms, continuous data collection, and the like. With control signals there will be a number of additional connections for normal operation.

In FIG. 2A, the injector 6 is shown with a closing member 18 having a pointed end 19 which closes the nozzle opening 20 of the injector 6, thereby lubricating oil. A spray 21 (see FIG. 2B) is injected into the cylinder 5. At the rear end of the closure member 18 a first chamber 22 is formed, wherein a spring 23 is provided which presses against the closure member with a closing abutment to the nozzle hole 20. . A second chamber 24 is formed around the pointed point in front of the closure member 18, where it is lubricated for injection into the engine cylinder 5 through the branch line 7 from the supply line 31. Oil is provided.

The return line 17 of the injector appears to be under full supply pressure through port A and common tube 8 when the injector is closed. Thus, one valve V1 is opened for the injector 6 by lowering the pressure in the return line 17 and the other valve V2 closes the injector 6 by applying pressure to the return line 17. do.

2B shows that V1 is activated and the pressure in the first chamber 22 of the injector behind the closure member has a return port R with a pressure much lower than the supply port P. Can flee through V1 and V2. The supply pressure in the lubricating oil from the branch line 7 exceeds the spring pressure and causes the closing member 18 to retract from the closing engagement to the nozzle hole 20 so that the lubricating oil 21 is injected into the cylinder 5 ( back) Apply force. This is caused by the prevailing high supply pressure in the second chamber 24 from the beginning of the injection.

2C shows that both V1 and V2 are activated. Thus, V2 is opened to the port P connected with the supply line 31, oil is pressurized through the V1 to the first chamber 22 and applied to the rear of the closing member 18. In this way, the pressure at both sides of the closing member 18 is equally large, so that the spring 23 pushes the closing member forward and closes the nozzle hole 20.

Then, V1 is deactivated to maintain pressure at the back of the injector before V2 is deactivated so that a new cycle can be restarted.

By using two valves V1 and V2, it is possible to achieve that the opening time of the injector 6 is only a few milliseconds, depending on the desired amount of oil to be transmitted by the injector.

3 shows the transition of the injection cycle over time. The control unit 25 is provided with a position signal 28 at time T1 and thereby the position of the piston in the cylinder 5 with respect to the crank angle and activation at time T2 with respect to the valve V1. ) Emits a signal. The valve V1 starts the injection of lubricating oil into the cylinder with a delay 29 indicated by T3-T2. The control unit 25 also sends an activation signal T4 to the valve V2 to stop the injection of the lubrication oil. The valve V2 is activated and stops the injection of the lubricating oil at time T5 with the delay 30 indicated by the time interval T5-T4. Deactivation of the valves V1 and V2 occurs at times T6 and T7. The amount of lubricating oil for the individual cylinders 5 is controlled by measuring the actual consumption by the volumetric meter 4 and by the feedback to the control unit 25 and the deviation from a given value stored in the control unit. If a deviation occurs, the opening time for the injector 6 is adjusted.

The lubrication time and amount of lubrication oil are controlled by the control unit 25 which controls the open / close valve unit 3 of each cylinder 5 on the basis of the given data and measurements stored in the control unit 25.

In order to ensure a uniform reaction time for the individual injectors 6, the common tube 8 is arranged such that the lengths of the tubes 8 between the respective injectors 6 and the associated open / close valves 3 are the same. On the return side of the injectors, it is divided into single pieces of tubing. At the same time, the volumetric meter 4 has a function of monitoring that the control unit 25 is operating. The volume meter 4 detects the consumption when activated by the control unit 25. The individual injectors 6 for each cylinder 5 are also controlled in that the control unit 25 compares the actual consumption at a given pressure and temperature of the oil with the expected value. For example, if the injector 6 is leaking or blocked, a deviation will be seen. As a result, the control unit 25 generates an alarm.

In order to achieve additional reliability, every other injector 6 in the cylinder 5 is fed from a fully functional independent lubrication system, and the other half from that unit can be doubled to monitor each other. In the event of an error, a normally operating system takes over the entire cylinder lubrication by doubling the amount of lubrication oil transferred from half the number of nozzles.

An arrangement for the open / close valve unit 3 for the two cylinders 5 is shown in FIGS. 4 and 5. The arrangement shown is provided by fittings 35 and mounting screws 36 between two cylinders 5. The unit shown is configured with two identical open / close valve units 3 to achieve redundancy.

Each of the two open / close valve units 3 has a valve block 37 with a switch valve 38 which can be set in the open and closed positions. The arrangement consists of a terminal box having a flow control block 39, on / off indicators 41, 42 and a flow indicator 40 for the solenoid valves. terminal box 45 and a valve control block 43 to which two solenoid valves 44 are fixed. The connecting lines 8, 15, 16 and the ports A, P, R are provided with the same reference numerals as indicated in connection with the description of the system shown in FIG. 1.

6 shows an alternative embodiment of the system shown in FIG. 1. Identical and corresponding elements will be designated with identical reference numbers. In the system shown in FIG. 6, a central accumulator 100 for oil transfer is used instead of a direct transfer from the central pump unit 1. By using the central accumulator 100 it is possible to evenly generate possible pressure changes in a particularly safe manner. Thus, the pressure becomes more uniform, and it becomes easier to control the amount of lubrication oil that is simultaneously transmitted.

Furthermore, in Fig. 6 a further embodiment of the system according to the invention is indicated by dashed lines, in which local accumulators 101 are shown. Thus, in this embodiment the central accumulator 100 will normally not be present, but the central lubricating oil feeder 1 will still be present. The local accumulators 101 are arranged in the branch line 7 between the supply line 31 and the injector 6. The local accumulator 101 is shown directly in front of the volumetric meter 4, but may alternatively be placed immediately after the volumetric meter. The local accumulator 101 is shown per cylinder.

Examples of feedback signals received by the control unit 25 are shown in FIG. 6, and examples of signals and data transmitted from the control unit 25 are shown.

In FIG. 7 an embodiment is shown in which two flowmeters 110 and 111 are installed on supply line 31 and return line 33 by direct connection to pump station 1. By this, it is possible to control the total consumption for the whole system.

In FIG. 8 is shown an embodiment in which it is installed to monitor the position where two valve slides change. For example, one or two induction encoders may be included for each valve. These encoders detect when valve slides are in the relevant extreme position and transmit a signal 109 to the control unit 25. This alternative solution can optionally be combined with installing two flow meters 110 and 111 as shown in FIG. 8. By this, it is possible to control the total consumption for the whole system.

Under some conditions, it may be desirable to adapt the transfer characteristics of the lubrication oil supplied through the injector. This can be achieved by changing the pressure in the supply line 31 and thus also the pressure in the branch line 15. By this, additional control parameters are added and it is possible to change propagation, composition (eg drop size, amount and density), and the speed of the transferred lubrication oil. The pressure change may be the amount to be administered, the temperature, the pressure inside the cylinder, the cylinder / engine load, etc.

Faster transfer of oil at higher pressure in feed line 31;

Finer spray / jet at higher pressure in feed line 31;

Can depend on

9 shows a system operating with variable working pressure in lubricating oil. The pressure valve 2 is replaced by two pressure valves 112 and 113 with respective pressure settings, where the pressure valve 112 is set to a higher pressure than the pressure valve 113. By the solenoid valve 114, access to the valve 112 can be blocked, whereby the pressure is adjusted to the level of the pressure valve 113. Reference numeral 116 denotes a connection between the control unit 25 and the pressure valve 114.

An alternative embodiment is shown in FIG. 10 where a stepless electrically regulated pressure valve 115 is used instead of the pressure valve 2 which provides the most flexible control. It is also seen that the pressure valve 115 is connected to the control unit 25 via the connection 116 from the point at which the pressure is controlled depending on the conditions.

As a further alternative embodiment, a technically simple solution can be made that can use an on / off solenoid valve that can automatically raise or lower the pressure level instead of the stepless pressure regulating valve.

Claims

A central lubricating oil feeder, which may be configured by a central pump station 1 or a central accumulator;
A supply line 31 from the lubricating oil feeder;
One or more, connected to the supply lines 31 via branch lines 15, adapted to inject the cylinder lubricating oil 21 through the one or more nozzle holes 20 into the associated cylinder 5. A number of injectors 6 corresponding to the number of cylinders 5 in the engine 32;
Opening / closing valve units 3 provided in the branch lines 15 between the injectors 6 and the supply lines 31; And
A control unit 25 for controlling each open / close valve unit 3;
A dosing system for cylinder lubricating oil to a large cylinder 5 in a diesel motor, for example in a marine engine, comprising:
The injectors 6 are connected via a second branch line 16 to a return line 33 to the lubrication oil supply for circulating the lubrication oil,
The open / close valve units 3 are provided at the second branch lines 16 between the injectors 6 and the return line 33 and connected with the return line 33,
The open / close valve units 3 connect the first chamber 22 behind the spring-biased closing member 18 in the injectors with the supply line 31 and the return line 33, respectively. Having a first inlet P and a first outlet R,
The injector 6 has a second chamber 24 in front of the closing member 18, the second chamber 24 connecting the second chamber 24 of the injector with the supply line 31. ),
Dispensing system for a cylinder lubricating oil, characterized in that the control unit (25) is connected at least with the open / close valve units (3).

The method of claim 1,
A branch line 7 connects the second chamber 24 of the injector with the supply line, the volumetric meter 4 is arranged to measure the volume of lubricating oil added per cylinder, and the control unit 25 is arranged for the volumetric meter 4. Dosing system for a cylinder lubricating oil, characterized in that connected to.

3. The method according to claim 1 or 2,
The first chamber 22 of the injectors is connected to the supply line 31 in the closed state of the injector, and the first chamber 22 of the injectors is returned to the return line 33 in the open state of the injector. Dosing system for the cylinder lubricating oil, characterized in that the open / closed valve unit (3) is connected to be connected with the.

10. A method according to any one of the preceding claims,
Dispensing system for cylinder lubricating oil, characterized in that one open / close valve unit (3) is provided for all injectors (6) installed in one cylinder (5).

The method according to claim 2 or 3,
Dispensing system for cylinder lubricating oil, characterized in that one open / close valve unit (3) and one volumetric meter (4) are provided for all injectors (6) installed in one cylinder (5).

The method according to claim 4 or 5,
Dispensing system for cylinder lubricating oil, characterized in that the open / close valve unit (3) is connected to the respective injectors (6) via connecting tubes (8) of equal length via a port (A).

10. A method according to any one of the preceding claims,
Dispensing system for a cylinder lubricating oil, characterized in that the supply line (31) and return line (33) at the farthest end from the lubricating oil supply includes a pressure valve (2) to ensure controlled circulation of the lubricating oil.

10. A method according to any one of the preceding claims,
Dosing system for cylinder lubricating oil, characterized in that the open / close valve unit (3) comprises at least two interconnected valves (V1, V2).

Applying pressure to the lubricating oil in the central lubricating oil feeder, which may be configured by the central pump station 1 or the central accumulator; Supplying lubricating oil through a supply line; Connected to the supply line 31 via branch lines 7, 15 by opening and closing the open / close valve units 3 arranged in the branch lines 15, and applied with one or more nozzle holes 20, Injecting cylinder lubricating oil into the associated cylinder (5) through a plurality of injectors (6) corresponding to the number of cylinders in the one or more engines; And controlling each open / close valve unit 3 by a control unit 25; for administering cylinder lubricating oil to large cylinders, for example in a marine engine, in a diesel engine 32. As a method,
The injectors 6 are connected via a second branch line 16 to a return line 33 to the lubrication oil supply for circulating the lubrication oil,
The open / close valve units 3 are provided at the second branch lines 16 between the injectors 6 and the return line 33 and connected with the return line 33,
The open / close valve units 3 feed the first chamber 22 through the first inlet P and the first outlet R, behind the spring-biased closing member 18 in the injectors. ) And return line 33, respectively,
The injector 6 has a second chamber 24 in front of the closing member 18, and connects the second branch 24 to the third branch line 7 connecting the second chamber 24 of the injector with the supply line 31. ),
The control of oil administration is carried out by opening and closing the open / close valve units 3 in the branch lines 16 between the injectors and the return line 33. .

The method of claim 9,
The volume measurement of the amount of lubricating oil supplied for each cylinder is performed in the branch line 7 connecting the second chamber 24 in front of the closing member 18 of the injector with the supply line 31. Method for administering.

The method of claim 9,
An empirical determination of the association between the opening time and the amount of lubricant oil transferred is established for the system, and this data is stored in the control unit and used to control oil dosing. How to.

12. The method according to any one of claims 9 to 11,
In the closed state of the injector, the first and second chambers 22 and 24 of the injectors respectively formed in front of and behind the closing member of the injector are connected to the supply line 31, and the first chamber of the injectors in the open state of the injector ( 22) is connected to the return line (33).

13. The method according to any one of claims 9 to 12,
The control of the oil dose comprises the control of the opening time and the waiting time for the at least two valve elements V1, V2 in the open / close valve unit 3. .

14. The method according to any one of claims 9 to 13,
A method for administering a cylinder lubricating oil, characterized in that the control of oil administration comprises a variable pressure in the feed line.