DE102013000606A1 - Fuel supply system - Google Patents

Abstract

Fuel supply system of an internal combustion engine, with a low-pressure area (4), with a pump device (3) to convey fuel from the low-pressure area (4) of the fuel supply system into a high-pressure area (6) thereof, the high-pressure area (6) between the pump device (3) Provided with injectors (1) and cylinders, there is a pressure storage system (7) permanently under high pressure, which has distribution units (9) coupled via a high pressure line (10), the pressure storage system (7) via at least one high pressure line also under permanent high pressure Pump device (3) is connected, the pressure storage system (7) being connected to the injectors (1) via high-pressure lines (11) which are sometimes under high pressure depending on the injection cycle, all the distributor units (9) of the pressure storage system which are connected via the high-pressure line (10) are coupled to a common leakage collection device (13) are connected to a leak sensor (14) common to all distributor units (9) in order to detect a leakage quantity for the pressure accumulator system as a unit, and each distributor unit (9) of the pressure accumulator system (7) has an individual visual inspection device (15) is assigned in order to assign the same to at least one distributor unit (9) in the event of a leak detected by the leakage sensor (14).

Description

The invention relates to a fuel supply system of an internal combustion engine according to the preamble of claim 1.

1 shows the basic structure of a known from the prior art common rail fuel supply system of an internal combustion engine, namely a marine diesel engine operated with heavy oil. This structure is from the DE 101 57 135 B4 known. Thus, the common rail fuel supply system includes the 1 each cylinder of the internal combustion engine in each case at least one injector 1 , About the injectors 1 is injectable into each of the cylinders of the internal combustion engine fuel. The common rail fuel supply system further comprises at least one low-pressure pump 5 , at least one high-pressure pump 2 and a high pressure pump reservoir 8th having pumping device 3 to get fuel from a low pressure area 4 the common rail fuel supply system in a high pressure area 6 to promote the same, being in the high pressure area 6 between the pumping device 3 and the injectors 1 a permanently high pressure accumulator system 7 is provided. The permanently high pressure accumulator system 7 , which is also referred to as a common rail, has a plurality of distributor units 9 on. The distribution units 9 are with the pumping device 3 as well as among each other via high-pressure lines permanently under high pressure 10 connected. The accumulator system 7 namely the distribution units 9 , are also dependent on the injection cycle temporarily high pressure high pressure lines 11 with the injectors 1 connected. The high-pressure lines that are temporarily under high pressure depending on the injection stroke 11 which the injectors 1 with the distribution units 9 connect, are switching valves 12 assigned to the injectors fuel depending on the injection rate. Regarding further details will be on the DE 101 57 135 B4 directed.

Such known from the prior art fuel supply system of an internal combustion engine has in the high pressure range 6 , Especially in the field of pressure accumulator system 7 which is over the high pressure lines 10 coupled distribution units 9 includes, over a variety of sealing points. Leaks can occur in the area of these sealing points, and if a leakage quantity becomes too great, proper operation of the fuel supply system can no longer be guaranteed.

There is therefore a need for excessive fuel leakage in the area of the accumulator system 7 in the high pressure area 6 the fuel supply system easy and reliable to detect and on the other hand, this fuel leak safely and reliably assigned to a specific sealing point.

On this basis, the present invention has the object to provide a novel fuel supply system of an internal combustion engine.

This object is achieved by a fuel supply system of an internal combustion engine according to claim 1.

According to the invention, all distributor units of the pressure accumulator system, which are coupled via the high-pressure line, are connected to a common leakage manifold with a leakage sensor common to all distributor units in order to detect a leakage amount above the limit for the pressure accumulator system as a unit, wherein each distributor unit of the accumulator system is an individual visual inspection device is assigned, in the case of a leakage detected via the leakage sensor to assign the same at least one distribution unit.

In the fuel supply system according to the invention, all distributor units of the pressure accumulator system and thus also the high-pressure lines coupling the distributor units are coupled to a common leakage manifold, this leakage manifold being assigned to the common leakage sensor for all distributor units. Then, when the total leakage in the accumulator system is greater than a threshold, the leak sensor responds and detects the leakage amount above the threshold. In order to concretely allocate the above-limit leakage of a specific sealing point or a distributor unit in the pressure accumulator system, each distributor unit of the pressure accumulator system is assigned an individual visual inspection device. With this visual inspection device, if the leakage sensor for the pressure accumulator system as a whole detects a leakage lying above the limit value, the leakage can be assigned to an individual distributor unit of the pressure accumulator system.

It is therefore not necessary to assign each distribution unit a separate leakage sensor. Rather, a common leakage sensor suffices for all distributor units, since the assignment of the leakage to a distributor unit takes place via the visual inspection devices. Such a fuel supply system allows a simple and reliable leakage detection and assignment of the detected leakage to an individual sealing point.

According to an advantageous development, each visual inspection device in the area of the respective Distributor unit having a leakage inlet coupled to the leakage manifold and a also coupled to the leakage manifold leakage drain, wherein the leakage inlet and the leakage outlet are coupled to a leakage chamber of the respective Sichtprüfeinrichtung, and wherein between the points at which the leakage inlet and the leakage process are coupled to the leakage manifold , a throttle is positioned. Such an embodiment of the visual inspection devices is particularly simple and therefore preferred.

If, in the area of a distributor unit, the leakage is less than the limit value, the leakage via the throttle flows directly into the leakage collecting line. Then, if in the region of a distributor unit the leakage is greater than the limit value, the leakage accumulated by the throttle reaches the leakage space of the respective visual inspection device via the respective leakage inlet. Then, if the leakage chamber of the respective visual inspection device is filled with leakage by more than a limit value, a further inflowing leakage flows via the respective leakage process from the leakage chamber into the leakage collecting line.

The leakage drain above the leakage inlet is preferably coupled to the leakage chamber of the respective visual inspection device, in particular in such a way that no emptying of the leakage chamber takes place even in the case of an engine inclination. This makes it possible to ensure that even when the fuel supply system is deactivated and, if appropriate, when the internal combustion engine is tilted, a leak can be reliably and reliably assigned to a sealing point or a distributor unit.

Preferred embodiments of the invention will become apparent from the dependent claims and the description below. Embodiments of the invention will be described, without being limited thereto, with reference to the drawings.

Showing:

1 a schematic of a prior art fuel supply system;

2 a section of a first fuel supply system according to the invention;

3 a detail of the fuel supply system according to the invention 2 ; and

4 a section of a second fuel supply system according to the invention.

The present invention relates to a fuel supply system, in particular a common rail fuel supply system, an engine designed in particular as a large diesel engine or ship diesel engine. The basic structure of such a fuel supply system has already been described with reference to 1 described. The present invention now relates to such details of the fuel supply system, the safe and reliable detection of leakage and a safe and reliable allocation of the leakage in the high pressure area 6 namely in the accumulator system 7 which enable fuel supply system.

2 shows a schematic section of a fuel supply system according to the invention in the region of the pressure storage system 7 , namely in the range of two via a high pressure line 10 coupled distribution units 9 the accumulator system 7 ,

All distribution units 9 are connected to a common leakage manifold 13 connected, the leakage manifold 13 for all distribution units 9 a common leakage sensor 14 assigned. Then, if in the overall system of the accumulator system 7 So at any sealing point in the accumulator system 7 If a leak occurs that is greater than a defined limit, this leakage may be for the accumulator system 7 as a whole or as a unit via the leakage sensor 14 be detected.

The fuel supply system according to the invention furthermore has in the region of each distributor unit 9 the accumulator system 7 via an individual visual inspection device 15 , With the visual inspection equipment 15 can then if the over the leakage sensor 14 detected total leakage is greater than the defined limit, the leaking leakage point in the accumulator system 7 identified and one or more distribution units 9 be assigned concretely.

To detect the leakage, which is greater than the limit and no longer ensures proper operation of the fuel supply system, is therefore a single leak sensor 14 sufficient. The assignment of the leakage and thus the identification of a leaking, causing the leakage sealing point via the Sichtprüfeinrichtungen 15 representing the individual distribution units 9 are assigned individually.

As 2 can be taken, are the distribution units shown there 9 the accumulator system 7 over the high pressure lines 10 coupled together, each distributor unit 9 on the one hand, a high-pressure inlet 16 and on the other hand, a high pressure drain 17 having. About the high pressure inlet 16 and the high pressure drain 17 can the distribution units 9 and thus also the visual inspection equipment 15 the distribution units 9 to the high pressure lines 10 be connected or the distribution units 9 over the high pressure lines 10 to the accumulator system 7 be linked.

Between the respective high-pressure inlet 16 and the respective high pressure drain 17 the respective distribution unit 9 extends a high pressure line section 18 passing through a hole in the respective distributor unit 9 is trained. About this hole or from this high-pressure line section 18 fuel flows from the high pressure inlet 16 to the high pressure drain 17 through the respective distributor unit 9 , Starting from this hole or from this high-pressure line section 18 can fuel from the respective distribution unit 9 in the direction of the respective injector 1 be derived.

As 2 can be removed, is any visual inspection device 15 in the area of the respective distribution unit 9 on the one hand via a leakage inlet 19 and on the other hand via a leakage process 20 with the leakage manifold 13 coupled. Both the leakage feed 19 as well as the leakage process 20 grab a leakage room 21 the respective visual inspection device 15 in the area of the respective distribution unit 9 at.

About the leakage inlet 19 may leak from the sealing point to be monitored, in the illustrated embodiment of the monitored high-pressure inlet 16 the respective distribution unit 9 , towards the leakage room 21 the respective visual inspection device 15 can be routed, and where about the leakage process 20 Leakage from the leakage chamber 21 the respective visual inspection device 15 towards the leakage manifold 13 can be derived.

According to 2 includes the respective visual inspection device 15 each distribution unit 9 still a throttle 22 , which is connected between the positions to which the leakage feed 19 and the leakage process 20 to the leakage manifold 13 are coupled.

Then, if in the area of a distribution unit 9 the leakage is less than a limit, the leakage can be over the respective throttle 21 directly into the leakage manifold 13 flow away.

Then, however, if in the area of the respective distribution unit 9 the leakage is greater than the limit, the leakage builds up in front of the throttle 22 and then passes through the leakage inlet 19 in the area of the respective leakage space 21 the respective visual inspection device 15 ,

Then, if the manifold unit individual leakage space 21 the respective distribution unit 9 or the respective visual inspection device 15 is filled with leakage and further leakage via the leakage inlet 19 then flows, then the leakage on the respective leakage process 20 from the respective leakage chamber 21 the respective visual inspection device 15 into the leakage manifold 13 drain off to overflow the leakage space 21 with leakage to avoid.

As already stated, is therefore in case of leakage in the accumulator system 7 , which is greater than a limit and does not allow proper operation of the fuel supply system, the leakage as such for the accumulator system 7 as a unit using the common leakage sensor 14 Detects which of the leakage manifold 13 assigned. Nevertheless, despite using a common leak sensor 14 the leakage of a specific sealing point or a concrete distributor unit 9 To allocate, has each distribution unit 9 via a visual inspection device 15 , in the embodiment shown to the high-pressure inlet 16 the respective distribution unit 9 is coupled. The respective visual inspection device 15 includes a leakage space 21 that has a leakage inflow 19 and a leakage process 20 to the leakage manifold 13 is coupled, namely such that between the leakage inlet 19 and the leakage manifold 13 a throttle 22 is switched. Then, when in the area of a distribution unit 19 If a leakage is greater than the limit, leakage can not be via the throttle 22 completely in the for all distribution units 19 common leakage manifold 13 drain, but rather accumulates the leakage in front of the throttle 22 and then passes through the leakage inlet 19 in the leakage room 21 the respective visual inspection device 15 , Air flowing in the leakage room 21 is located above the leakage process 20 from the collection room 21 towards the leakage manifold 13 dissipated. If there is more leakage over the leakage inlet 19 in the respective leakage space 21 is funded, flows from a certain level in the leakage chamber 21 further leakage via the leakage process 20 from the leakage room 21 towards the leakage manifold 13 from.

As 3 can be taken, is the leakage process 20 above the leakage inlet 19 to the leakage room 21 the respective visual inspection device 15 coupled to first fill the respective leakage space 21 in the event of a leakage in the area of the respective distributor unit 9 , which is greater than the limit, and then, if the leakage space 21 has reached a certain level, further inflowing leakage in the direction of the leakage manifold 13 dissipate.

Then, when in the area of a visual inspection device 15 namely in the area of the leakage space 21 Such a visual inspection device has collected leakage, this can be done through a sight glass 23 be perceived visually.

In this case, if a leakage that is greater than the limit value is detected and has led to a shutdown of the fuel supply system, complete leakage of the leakage from the leakage chamber 21 that visual inspection device 15 the distributor unit 9 , at which the impermissibly high leakage has occurred, to avoid attacks the leakage feed 19 such at the respective leakage chamber 21 that a complete drainage of the leakage over the leakage inlet 19 is impossible. This also applies if an inclination of the internal combustion engine and thus the fuel supply system is present. So shows 3 a section of a fuel supply system in the region of a distribution unit 9 in installation position, with a dash-dotted line 24 a leakage level in the treats 21 the respective visual inspection device 15 is indicated.

Then, when the fuel supply system is stopped and therefore no further leakage into the leakage chamber 21 nachfließt, and if further due to a fluctuation of the internal combustion engine, the same in 3 As shown in the figure, it is ensured that at least part of the leakage is in the leakage space 21 remains and over the sight glass 23 can be recognized from the outside.

After a successful repair or repair of a leakage point of the fuel supply system, the leakage chamber 21 the respective visual inspection device 15 to empty completely is in the embodiment of 2 and 3 the sight glass 23 Removable by unscrewing, so that then still in the leakage chamber 21 removed leakage amount from the same.

In contrast to this shows 4 an embodiment in which an additional valve 25 is present over which after repair of a leak the residual leakage from the leakage chamber 21 can be dissipated. In this case, then the sight glass 23 can not be disassembled, but can with mounted sight glass 23 by actuating the valve 25 complete emptying of the respective leakage space 21 the respective visual inspection device 15 be guaranteed.

LIST OF REFERENCE NUMBERS

1

injector

2

high pressure pump

3

pumping device

4

Low pressure area

5

Low pressure pump

6

High pressure area

7

Accumulator system

8th

High-pressure pumps memory

9

distribution unit

10

High-pressure line

11

High-pressure line

12

switching valve

13

Leakage manifold

14

leakage sensor

15

Sichtprüfeinrichtung

16

High-pressure inlet

17

High-pressure flow

18

High-pressure line section

19

leakage feed

20

leakage drain

21

leakage chamber

22

throttle

23

sight glass

24

leakage level

25

Valve

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 10157135 B4 [0002, 0002]

Claims (6)

Fuel supply system, in particular common rail fuel supply system, an engine designed in particular as a large diesel engine or ship diesel engine, with a Niederduckbereich ( 4 ), with a pumping device ( 3 ) to fuel from the low-pressure area of the fuel supply system in a high pressure area ( 6 ) thereof, wherein in the high-pressure region between the pumping device ( 3 ) and cylinders associated with injectors ( 1 ) a permanently high pressure accumulator system ( 7 ) is provided, which via a high-pressure line ( 10 ) coupled distribution units ( 9 ), wherein the accumulator system ( 7 ) via at least one likewise permanently high pressure high-pressure line to the pump device ( 3 ), the accumulator system ( 7 ) over high pressure lines temporarily under high pressure depending on the injection stroke ( 11 ) with the injectors ( 1 ), characterized in that all distributor units ( 9 ) of the accumulator system, which via the high pressure line ( 10 ) are coupled to a common leakage manifold ( 13 ) with one for all distributor units ( 9 ) common leakage sensor ( 14 ) are connected to detect a leakage amount above the limit for the accumulator system as a unit, and that each distributor unit ( 9 ) of the accumulator system ( 7 ) an individual visual inspection device ( 15 ) in order, in the case of a via the leakage sensor ( 14 ) detected leakage the same at least one distribution unit ( 9 ). Fuel supply system according to claim 1, characterized in that each visual inspection device ( 15 ) in the region of the respective distributor unit ( 9 ) one with the leakage manifold ( 13 ) coupled leakage feed ( 19 ) and also with the leakage manifold ( 13 ) coupled leakage process ( 20 ), wherein between the locations at which the leakage feed ( 19 ) and the leakage process ( 20 ) to the leakage manifold ( 13 ), a throttle ( 22 ) is positioned. Fuel supply system according to claim 2, characterized in that when in the region of a distributor unit ( 9 ) the leakage is less than the limit value, the leakage through the throttle ( 22 ) directly into the leakage manifold ( 13 ) flows off, that when in the range of a distribution unit ( 9 ) the leakage is greater than the limit set by the throttle ( 22 ) accumulated leakage over the respective leakage feed ( 19 ) in a leakage space ( 21 ) of the respective visual inspection device ( 15 ), and that if the leakage space ( 21 ) of the respective visual inspection device ( 15 ) is filled by more than one limit with leakage, a further inflowing leakage over the respective leakage process ( 20 ) from the leakage space ( 21 ) into the leakage manifold ( 13 ) drains off. Fuel supply system according to claim 3, characterized in that the leakage process ( 20 ) above the leakage inlet ( 19 ) to the leakage space ( 21 ) of the respective visual inspection device ( 15 ) is coupled. Fuel supply system according to claim 3 or 4, characterized in that the leakage process ( 20 ) and the leakage feed ( 19 ) to the leakage space ( 21 ) of the respective visual inspection device ( 15 ) are coupled, that even at a motor inclination no emptying of the leakage space ( 21 ) he follows. Fuel supply system according to one of claims 3 to 5, characterized in that the leakage space ( 21 ) of the visual inspection device ( 15 ) of each distribution unit ( 9 ) via a valve ( 25 ) is emptied.

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