(19)
(11)EP 3 377 739 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
17.06.2020 Bulletin 2020/25

(21)Application number: 16791038.9

(22)Date of filing:  07.11.2016
(51)International Patent Classification (IPC): 
F01N 13/10(2010.01)
F02M 61/14(2006.01)
F02M 53/06(2006.01)
F02M 53/04(2006.01)
F02F 1/42(2006.01)
(86)International application number:
PCT/EP2016/076786
(87)International publication number:
WO 2017/084902 (26.05.2017 Gazette  2017/21)

(54)

AN ENGINE BLOCK WHICH PROTECTS FUEL INJECTOR AGAINST CORROSION

MOTORBLOCK ZUM SCHUTZ DES KRAFTSTOFFINJEKTORS VOR KORROSION

BLOC MOTEUR PROTÉGEANT UN INJECTEUR DE CARBURANT CONTRE LA CORROSION


(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30)Priority: 16.11.2015 TR 201514417

(43)Date of publication of application:
26.09.2018 Bulletin 2018/39

(73)Proprietors:
  • Robert Bosch GmbH
    70442 Stuttgart (DE)
  • Bosch Sanayi Ve Ticaret Anonim Sirketi
    16372 Bursa (TR)

(72)Inventor:
  • ALTIN, Mete
    16372 Bursa (TR)


(56)References cited: : 
WO-A1-02/097259
FR-A- 1 536 850
JP-A- 2002 161 827
US-A- 5 950 596
US-A1- 2004 025 837
CN-U- 202 851 218
GB-A- 2 049 811
US-A- 1 967 243
US-A1- 2003 178 009
  
      
    Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


    Description

    TECHNICAL FIELD



    [0001] The present invention relates to fuel injectors used for spraying fuel into the combustion chamber in internal combustion engines, and relates to engine blocks whereon said injectors are placed.

    PRIOR ART



    [0002] Fuel injectors in general provide spraying fuel with desired intervals into the combustion chamber in internal combustion engines.

    [0003] The fuel, which passes in a controlled manner through the valve region defined inside fuel injectors, passes through the spray pipe extending inside the engine block, and it arrives at the spray tip opened to the combustion chamber provided in the engine, and it is sprayed into the combustion chamber. The acidic gases, formed as a result of the explosions which occur in the combustion chamber, enter between the spray pipe and the engine block, and they lead to corrosion outside of the spray pipe, in other words, they lead to corrosion in the fuel injector.

    [0004] WO 02/097259 A1 discloses a fuel injector mounted in a bore in the intake manifold and heated by exhaust gas from the exhaust system, the exhaust gas flowing around the injector tip mounted in its bore and being returned to the exhaust system, the exhaust gas heating the injector in order to enhance fuel evaporation after injection.

    [0005] As a result, because of all of the abovementioned problems, an improvement is required in the related technical field.

    BRIEF DESCRIPTION OF THE INVENTION



    [0006] The present invention relates to an engine block, for eliminating the above mentioned disadvantages and for bringing new advantages to the related technical field.

    [0007] The main object of the present invention is to provide an engine block where corrosion between the spray pipe of the fuel injector and the engine block is prevented.

    [0008] In order to realize all of the abovementioned objects and the objects which are to be deducted from the detailed description below, the present invention as defined in claim 1 relates to an engine block where a fuel injector having at least one spray pipe is fixed, in order to be used for providing spraying of fuel into the combustion chamber in a controlled manner in internal combustion engines. Accordingly, said engine block comprises at least one channel wherein hot exhaust gases circulate in order to increase the temperature in the vicinity of said spray pipe. Thus, when desired, hot exhaust gases are transferred into the channel and thus, the periphery of the spray pipe is heated. By means of this, condensation and corrosion formation at the periphery of the spray pipe is prevented.

    [0009] According to the invention, the channel at least partially surrounds the spray pipe and is connected to the exhaust system of the internal combustion engine. Thus, the spray pipe is heated along the periphery thereof.

    [0010] In a preferred embodiment of the subject matter invention, there is at least one temperature sensor connected to the spray pipe.

    [0011] In a preferred embodiment of the subject matter invention, there is at least one control unit connected to the temperature sensor. Thus, when the temperature around the spray pipe decreases below a pre-calculated value, hot exhaust gases are transferred to the channel. In another embodiment, when the load applied to the motor is reduced, it is expected that the temperature will decrease, and the control unit provides transfer of hot exhaust gases to the channel.

    [0012] In a preferred embodiment of the subject matter invention, the spray pipe is positioned in an opening provided on the engine block.

    BRIEF DESCRIPTION OF THE FIGURES



    [0013] In Figure 1, a representative view of the subject matter engine block and of the fuel injector provided on said engine block is given.

    REFERENCE NUMBERS



    [0014] 
    10
    Fuel injector
    20
    Injector body
    21 Valve element
    22 Spray pipe
    23 Spray tip
    24 Fuel channel
    30
    Engine block
    31 Opening
    32 Combustion chamber
    33 Channel
    40
    Temperature sensor
    50
    Critical region
    60
    Control unit

    THE DETAILED DESCRIPTION OF THE INVENTION



    [0015] In this detailed description, the subject matter fuel injector (10) is explained with references to examples without forming any restrictive effect only in order to make the subject more understandable.

    [0016] As can be seen in Figure 1, the subject matter fuel injector (10) comprises an injector body (20) wherein the valve elements (21) are positioned. There is at least one spray pipe (22) extending outwardly from said injector body (20). The tip of said spray pipe (22) is defined as a spray tip (23). There is at least one fuel channel (24) extending through the injector body (20) towards the spray tip (23). The fuel, which is transferred to the fuel channel (24) under the control of the valve elements (21) inside the injector body (20), advances along the spray pipe (22), and it passes through the spray tip (23), and it exits the fuel injector (10).

    [0017] In order to provide reaching of the fuel, exiting the fuel injector (10), at the combustion chamber (32) formed inside the engine block (30), the fuel injector (10) is fixed to at least one opening (31) provided on the engine block (30). On the engine block (30), there is at least one channel (33) provided in the vicinity of the fuel injector (10). Said channel (33) at least partially surrounds the periphery of the fuel injector (10). The channel (33) is connected to the exhaust system (not illustrated in the figures) of the engine. In other words, the hot gases formed after combustion in the combustion chamber (32) can be transferred into the channel (33) when desired. Moreover, there is at least one temperature sensor (40) which measures the temperature of the critical region (50) defined between the spray pipe (22) and the wall of the opening (31) provided on the engine block (30). Said temperature sensor (40) transfers the measurement values to a control unit (60).

    [0018] In said embodiment, the fuel, exiting the spray tip (23), reaches the combustion chamber (32). The gases formed after the explosions occurring in the combustion chamber (32) try to enter into the critical region (50) defined between the engine block (30) and the spray pipe (22). The gases, which enter between the spray pipe (22) and the engine block (30), condense in cases where the engine operates under low load and cools, and said gases may lead to corrosion in the critical region (50). In order to prevent said corrosion, the hot exhaust gases formed in the combustion chamber (32) are transferred into the channels (33), and the periphery of the critical region (50) is heated. Thus, condensation and thereby corrosion are prevented. The control unit (60) can provide transfer of the hot gases into the channel (33) depending on the measured temperature value. In an alternative embodiment, the control unit (60) checks the amount of load applied to the motor, and it can provide transfer of hot exhaust gases to the channel (33) in case of low loads. By means of said embodiment, the critical region (50) is heated without needing additional energy, and thereby corrosion is prevented.

    [0019] The protection scope of the present invention is set forth in the annexed Claims and cannot be restricted to the illustrative disclosures given above, under the detailed description. It is because a person skilled in the relevant art can obviously produce similar embodiments under the light of the foregoing disclosures, without departing from the main principles of the present invention. The scope of the invention is defined by the appended claims.


    Claims

    1. An engine block (3) where a fuel injector (10) having at least one spray pipe (22) is fixed, in order to be used for providing spraying offuel into the combustion chamber (32) in a controlled manner in internal combustion engines, characterized in that said engine block (30) comprises at least one channel (33) at least partially surrounding said spray pipe (22) and being connected to the exhaust system of the internal combustion engine, wherein hot exhaust gases circulate in order to increase the temperature in a critical region (50) defined between the engine block (30) and said spray pipe (22).
     
    2. An engine block (30) according to claim 1, characterized by comprising at least one temperature sensor (40) assigned to said critical region (50) connected to the spray pipe (22).
     
    3. An engine block (30) according to claim 2, characterized by comprising at least one control unit (60) connected to the temperature sensor(40).
     
    4. An engine block (30) according to claim 1, characterized in that the spray pipe (22) is positioned in an opening (31) provided on the engine block (30).
     


    Ansprüche

    1. Motorblock (3), an dem ein Kraftstoffinjektor (10) mit mindestens einem Spritzrohr (22) befestigt ist, um zur Bereitstellung des Einspritzens von Kraftstoff in die Brennkammer (32) auf eine gesteuerte Weise in Brennkraftmaschinen verwendet zu werden, dadurch gekennzeichnet, dass der Motorblock (30) mindestens einen Kanal (33) umfasst, der das Spritzrohr (22) zumindest teilweise umgibt und mit dem Auslasssystem der Brennkraftmaschine verbunden ist, in dem heiße Abgase zirkulieren, um die Temperatur in einem kritischen Bereich (50), der zwischen dem Motorblock (30) und dem Spritzrohr (22) definiert ist, zu erhöhen.
     
    2. Motorblock (30) nach Anspruch 1, dadurch gekennzeichnet, dass er mindestens einen Temperatursensor (40) umfasst, der dem kritischen Bereich (50) zugeordnet und mit dem Spritzrohr (22) verbunden ist.
     
    3. Motorblock (30) nach Anspruch 2, dadurch gekennzeichnet, dass er mindestens eine Steuereinheit (60) umfasst, die mit dem Temperatursensor (40) verbunden ist.
     
    4. Motorblock (30) nach Anspruch 1, dadurch gekennzeichnet, dass das Spritzrohr (22) in einer am Motorblock (30) vorgesehenen Öffnung (31) positioniert ist.
     


    Revendications

    1. Bloc moteur (3), dans lequel est fixé un injecteur de carburant (10) ayant au moins un conduit de pulvérisation (22), devant être utilisé pour assurer la pulvérisation de carburant dans la chambre de combustion (32) de manière contrôlée dans des moteurs à combustion interne, caractérisé en ce que ledit bloc moteur (30) comprend au moins un canal (33) entourant au moins en partie ledit conduit de pulvérisation (22) et étant connecté au système d'échappement du moteur à combustion interne dans lequel les gaz d'échappement chauds circulent afin d'augmenter la température dans une région critique (50) définie entre le bloc moteur (30) et ledit conduit de pulvérisation (22).
     
    2. Bloc moteur (30) selon la revendication 1, caractérisé en ce qu'il comprend au moins un capteur de température (40) affecté à ladite région critique (50) connectée au conduit de pulvérisation (22).
     
    3. Bloc moteur (30) selon la revendication 2, caractérisé en ce qu'il comprend au moins une unité de commande (60) connectée au capteur de température (40).
     
    4. Bloc moteur (30) selon la revendication 1, caractérisé en ce que le conduit de pulvérisation (22) est positionné dans une ouverture (31) prévue sur le bloc moteur (30).
     




    Drawing








    Cited references

    REFERENCES CITED IN THE DESCRIPTION



    This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

    Patent documents cited in the description