DK201570216A1 - Internal combustion power machine system and method and control device for operating the same - Google Patents

Internal combustion power machine system and method and control device for operating the same Download PDF

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Publication number
DK201570216A1
DK201570216A1 DK201570216A DKPA201570216A DK201570216A1 DK 201570216 A1 DK201570216 A1 DK 201570216A1 DK 201570216 A DK201570216 A DK 201570216A DK PA201570216 A DKPA201570216 A DK PA201570216A DK 201570216 A1 DK201570216 A1 DK 201570216A1
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DK
Denmark
Prior art keywords
internal combustion
combustion power
power machine
exhaust gas
shut
Prior art date
Application number
DK201570216A
Inventor
Andreas Döring
Original Assignee
Man Diesel & Turbo Se
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Publication of DK201570216A1 publication Critical patent/DK201570216A1/en
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Publication of DK179059B1 publication Critical patent/DK179059B1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D25/00—Controlling two or more co-operating engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B21/00—Combinations of two or more machines or engines
    • F01B21/02—Combinations of two or more machines or engines the machines or engines being all of reciprocating-piston type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B25/00—Regulating, controlling, or safety means
    • F01B25/16—Safety means responsive to specific conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B25/00—Regulating, controlling, or safety means
    • F01B25/26—Warning devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/008—Mounting or arrangement of exhaust sensors in or on exhaust apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B73/00—Combinations of two or more engines, not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/08—Safety, indicating or supervising devices
    • F02B77/085—Safety, indicating or supervising devices with sensors measuring combustion processes, e.g. knocking, pressure, ionization, combustion flame
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D25/00—Controlling two or more co-operating engines
    • F02D25/04—Controlling two or more co-operating engines by cutting-out engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • F01N13/10—Other arrangements or adaptations of exhaust conduits of exhaust manifolds
    • F01N13/107—More than one exhaust manifold or exhaust collector
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/04—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning exhaust conduits

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Analytical Chemistry (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Abstract

A method for operating a internal combustion power machine system (10), wherein the internal combustion power machine system (10) comprises at least two internal combustion power machines (11, 12), in which fuel can be combusted subject to forming exhaust gas, and an exhaust gas after-treatment system (13) that is common to the at least two internal combustion power machines (11, 12), in which the exhaust gas of the internal combustion power machines (11, 12) can be subjected to an exhaust gas after-treatment, wherein downstream of at least one of the internal combustion power machines (11, 12), which are assigned a common exhaust gas after-treatment system (13), and upstream of the common exhaust gas after-treatment system (13) a shut-off device (14, 18) is arranged which in particular when the respective internal combustion power machine (11, 12) is passive, is closed to avoid exhaust gas backflow from at least one other running internal combustion power machine (11, 12) in the direction of the respective passive internal combustion power machine (11, 12), wherein with the help of at least one sensor (16, 19) a gas composition and/or a gas temperature downstream of at least one passive internal combustion power machine (11, 12) and upstream of the respective closed shut-off device (14, 18) is determined, and wherein dependent on this it is checked if there is exhaust gas backflow in the direction of the respective passive machine (11, 12) despite closed shut-off device (14, 18).

Description

Internal combustion power machine system and method and control device for operating the same
The invention relates to a method for operating an internal combustion power machine system according to the preamble of claim 1. The invention furthermore relates to a control device for carrying out the method and to an internal combustion power machine system with such a control device.
On ships for example, internal combustion power machine systems are employed which comprise multiple internal combustion power machines and a common exhaust gas after-treatment system. Accordingly, fuel can be simultaneously combusted in such internal combustion power machine systems in multiple internal combustion power machines subject to the creation of exhaust gas, wherein the exhaust gas of the internal combustion power machine is conducted via the common exhaust gas after-treatment system for exhaust gas after-treatment.
In particular when such an internal combustion power machine system is operated at partial/reduced load it is already known from practice to shut down at least one internal combustion power machine and merely operate at least one other internal combustion power machine. In order to prevent that with such a passive internal combustion power machine of such an internal combustion power machine system exhaust gas of the running internal combustion power machine flows back into the region of the passive internal combustion power machine it is already known from practice to assign a shut-off device to at least such internal combustion power machines of the internal combustion power machine systems that can be shut down, with the help of which exhaust gas backflow in the direction of a passive internal combustion power machine can be avoided. To this end, the respective shut-off device is then closed.
In particular because of wearing of such shut-off devices a state can materialise during the operation of such an internal combustion power machine system in which in particular when an internal combustion power machine is passive and the shut-off device assigned to this internal combustion power machine is closed, exhaust gas backflow via the closed shut-off device nevertheless occurs. In this case, the exhaust gas then enters the region of the passive internal combustion power machine as a result of which corrosion problems can occur in particular on assemblies of the passive internal combustion power machine because of precipitation of sulphuric acid. Up to now, no measures are known with the help of which exhaust gas backflow via a closed shut-off device assigned to a passive internal combustion power machine can be securely and reliably detected.
Starting out from this, the present invention is based on the object of creating a new type of method for operating an internal combustion power machine system, a control device for carrying out the method and an internal combustion power machine system having such a control device.
This object is solved through a method according to claim 1.
According to the invention, a gas composition and/or a gas temperature is determined downstream of at least one passive internal combustion power machine and upstream of the closed shut-off device that is assigned to the respective passive internal combustion power machine with the help of at least one sensor, wherein dependent on this it is checked if there is exhaust gas backflow in the direction of the respective passive internal combustion power machine despite closed shut-off device.
The present invention proposed for the first time a method for operating an internal combustion power machine system with the help of which it can be securely and reliably detected if a closed shut-off device assigned to a passive internal combustion power machine is leaking and there is consequently exhaust gas backflow in the direction of the respective passive internal combustion power machine. Because of this it is possible upon detected exhaust gas backflow to initiate countermeasures in order to avoid corrosion problems on the passive internal combustion power machine.
In particular when there is exhaust gas backflow in the direction of an internal combustion power machine with closed shut-off device assigned to the respective internal combustion power machine is present, a leak of the respective shut-off device is preferentially inferred and a measure, in particular an error message and/or measure for reducing the exhaust gas backflow triggered on the control side. The corrosion risk on a passive internal combustion power machine can thereby be reduced.
According to an advantageous further development, exhaust gas backflow in the direction of an internal combustion power machine with closed shut-off device assigned to the respective internal combustion power machine is inferred in particular when an amount of a characteristic quantity detected with the help of the sensor positioned between the respective passive internal combustion power machine and the respective closed shut-off device amounts to at least X %, in particular at least 50 %, preferably at least 25 %, most preferably at least 10 % of an amount of a characteristic quantity detected with the help of a preferentially structurally identical sensor positioned downstream of the closed shut-off device or downstream of another running internal combustion power machine. A particularly advantageous detection of exhaust gas backflow via a closed shut-off device in the direction of a passive internal combustion power machine is thereby possible.
The control device is defined in claim 7 and the internal combustion power machine system in claim 8.
Preferred further developments of the invention are obtained from the subclaims and the following description. Exemplary embodiments of the invention are explained in more detail with the help of the drawing without being restricted to this. There it shows:
Fig. 1: a diagram of a first internal combustion power machine system;
Fig. 2: a diagram of a second internal combustion power machine system;
Fig. 3: a diagram of a third internal combustion power machine system; and
Fig. 4: a signal flow diagram of the method for operating an internal combustion power machine system.
The present invention relates to a method for operating an internal combustion power machine system, to a control device for carrying out the method and to an internal combustion power machine system.
Fig. 1 shows a diagram of a first internal combustion power machine system 10 according to the invention with two internal combustion power machines 11, 12. The internal combustion power machines 11 and 12 shown in Figs. 1 and 2 are combustion engines, preferentially marine diesel combustion engines. It is pointed out here that the invention is not restricted to combustion internal combustion power machine systems, which utilise internal combustion engines. The invention can rather be employed also in internal combustion power machine systems the internal combustion power machines of which are designed as fluid flow machines such as for example gas turbines or the like.
In the internal combustion power machines 11, 12 of the internal combustion power machine system 10 fuel can be combusted subject to forming exhaust gas wherein the exhaust gas of the internal combustion power machines 11,12 can be conducted via a common exhaust gas after-treatment system 13 for the exhaust gas after-treatment of the exhaust gas.
In the exemplary embodiment of Fig. 1, the internal combustion power machine 11 is assigned a shut-off device 14 which is positioned downstream of the internal combustion power machine 11 in order to decouple the internal combustion power machine 11 from the exhaust gas flow in particular when the internal combustion power machine 11 is shut down with running internal combustion power machine 12, thereby preventing a backflow of the exhaust gas of the running internal combustion power machine 12 in the direction of the passive internal combustion power machine 11. This shut-off device 14 is typically a shut-off flap or the like.
Fig. 1, furthermore, shows a control device 15 via which according to the dashed arrows of Fig. 1 the operation of the internal combustion power machines 11,12 can be controlled and/or regulated, and via which the shut-off device 14 can furthermore be closed and opened, namely dependent on whether the internal combustion power machine 11 is passive or running. Accordingly, in particular when the internal combustion power machine 11 is passive and the internal combustion power machine 12 is running, the shut-off device 14 assigned to the internal combustion power machine 11 is automatically closed via the control device 15.
According to Fig. 1, a sensor 16 is arranged downstream of the internal combustion power machine 11, which in the exemplary embodiment of Fig. 1 can be shut down with running internal combustion power machine 12 and upstream of the shut-off device 14 assigned to this internal combustion power machine 11 that can be shut down, with the help of which sensor 16 a gas composition and/or a gas temperature downstream of the passive internal combustion power machine 11 and upstream of the closed shut-off device 14 can be determined.
Dependent on this it is checked if with running internal combustion power machine 12, with passive internal combustion power machine 11 and with closed shut-off device 14 there is exhaust gas backflow in the direction of the passive internal combustion power machine 11 despite closed shut-off device 14. This check is automatically performed by the control device 15.
In particular when exhaust gas backflow in the direction of the passive internal combustion power machine 11 with closed shut-off device 14 assigned to the passive internal combustion power machine 11 is present or detected, a leakage of the shut-off device 14 is inferred on the control side and a measure triggered on the control side. This is for example an error message or a message in order to initiate maintenance or a replacement of the shut-off device 14. Alternatively or additionally, a measure can be triggered on the control side in order to reduce or avoid the exhaust gas backflow in the direction of the passive internal combustion power machine. It is thus possible for example to put the previously shut down internal combustion power machine 11 into running and/or reduce the power of the running internal combustion power machine 12.
As already explained above, the gas composition and/or the gas temperature is checked with the help of the sensor 16 downstream of the passive internal combustion power machine 11 and upstream of the closed shut-off device 14 in order to infer exhaust gas backflow via the closed shut-off device 14 in the direction of the passive internal combustion power machine 11 based on the gas composition and/or the gas temperature. In particular when a characteristic quantity detected with the help of the sensor 16 is greater than a defined limit value will a backflow of exhaust gas via the closed shut-off device 14 in the direction of the passive internal combustion power machine 11 be inferred. This limit value can for example be permanently stored in the control device 15.
Fig. 2 shows a further development of the internal combustion power machine system 10 of Fig. 1, with which upstream of the exhaust gas after-treatment system 13 and downstream of the shut-off device 14 a further sensor 17 is positioned, with the help of which a gas composition and/or a gas temperature upstream of the exhaust gas after-treatment system 13 can be detected. The sensor 17 preferentially is a structurally identical sensor as the sensor 16 so that with the sensors 16 and 17 of Fig. 2 identical characteristic quantities, for example characteristic quantities regarding the gas composition and/or the gas temperature can be detected.
In the exemplary embodiment of Fig. 2 it is provided that based on the characteristic quantity detected by the sensor 17 a limit value is dynamically determined based on which it is then detected on the control side if there is exhaust gas backflow via the closed shut-off device 14 with passive internal combustion power machine 11. In the exemplary embodiment of Fig. 2 exhaust gas backflow via the closed shut-off device 14 in the direction of the passive internal combustion power machine 11 is then preferentially detected with running internal combustion power machine 12, with passive internal combustion power machine 11 and with closed shut-off device 14 when an amount of the characteristic quantity X % detected by the sensor 16 amounts to in particular at least 50 %, preferably at least 25 %, most preferably at least 10 % of the amount of the same characteristic quantity detected with the help of the sensor 14. Expressed in other words this means that in Fig. 2 exhaust gas backflow via the closed shut-off device 14 in the direction of the passive internal combustion power machine 11 is detected in particular with passive internal combustion power machine 11 and with closed shut-off device 14 when a ratio between the characteristic quantity which is detected with the sensor 16 located upstream of the closed shut-off device 14 and the characteristic quantity, which is detected with the sensor 17 located downstream of the closed shut-off device 14 is greater than a limit value, that is greater than X %. This limit value can for example be load-dependent, i.e. dependent on the load with which the internal combustion power machine system is operated.
In the exemplary embodiment of Figs. 1 and 2 exclusively one of the shown internal combustion power machines 11, 12 is assigned a shut-off device 14. Compared with this, Fig. 1 shows a further development of the internal combustion power machine system 10 of Fig. 1 in which the internal combustion power machine 12 is also assigned a shut-off device 18 and upstream of this shut-off device 18 and downstream of the internal combustion power machine 12 a sensor 19 for determining a gas composition and/or a gas temperature. The version of Fig. 3 is preferred in particular when alternately both internal combustion power machines 11, 12 of the internal combustion power machine system 10 can be shut down with the respective other internal combustion power machine running. Figs.
1 and 2 are then preferred when an internal combustion power machine is permanently running and the other internal combustion power machine is switched on in addition as required. With the version of Fig. 3 each of the internal combustion power machines 11, 12 with the respective other internal combustion power machine 12, 11 running can accordingly be shut down and the shut-off device 14 and 18 respectively assigned to the respective passive internal combustion power machine 11 and 12 respectively be closed, wherein the tightness of the closed shut-off device 14 and 18 respective can then be checked with the help of the respective sensor 16 and 19 respectively. The other sensor 19 and 16 respectively preferentially of the same type assigned to the respective other internal combustion power machine in operation then serves for determining a limit value which when exceeded or reached a leakage of the shut-off device 14 and 18 respectively assigned to this internal combustion power machine is inferred in the signal of the sensor assigned to the passive internal combustion power machine.
As already explained, the sensors 16, 17, 19 are sensors for determining a gas composition and/or a gas temperature. As sensors, lambda sensors and/or NOx-sensors and/or FIC-sensors and/or NFh-sensors and/or CO-sensors or and/or CC>2-sensors or temperature sensors or exhaust gas particle sensors and/or other sensors can be preferentially employed.
Fig. 4 shows a signal flow diagram of the method according to the invention for operating an internal combustion power machine system according to the invention, wherein a block 20 of Fig. 4 visualises the start of the method according to the invention.
In a step represented by block 21 it is checked if one of the internal combustion power machines of an internal combustion power machine system, which is assigned a common exhaust gas after-treatment system, is passive and if another internal combustion power machine, which utilises the same exhaust gas after-treatment system, is running. If this is not the case, the method loops back to the step represented by block 21. If this, by contrast, is not the case, i.e. if at least one of the internal combustion power machines of the internal combustion power machine system which is assigned a common exhaust gas after-treatment system is passive while another internal combustion power machine of the internal combustion power machine system is running, the method branches out from the step represented by block 21 to a step represented by block 22.
In the step represented by block 22 the signal of the sensor which is assigned to the passive internal combustion power machine of the internal combustion power machine system is evaluated. In a following step represented by block 23 it is checked if the signal or the characteristic quantity of the sensor which is assigned to the passive internal combustion power machine of the internal combustion power machine system exceeds a limit value.
If this is not the case, the method loops back starting out from the step represented by block 23 to the step represented by block 23. If by contrast the limit value is reached or exceeded, the method branches out from block the step represented by 23 to a step represented by block 24 where a measure is initiated on the control side, for example an error message.
Following this, the method according to the invention is terminated in a step represented by block 25.
Accordingly, according to the invention, a gas composition and/or a temperature downstream of at least one passive internal combustion power machine and upstream of the closed shut-off device 14 and 18 respectively assigned to the respective passive internal combustion power machine is determined with the help of at least one sensor 16 and 19 respectively, wherein dependent on the signal of this sensor it is checked in the control device 15 if there is exhaust gas backflow in the direction of the respective passive internal combustion power machine despite closed shut-off device.
This method is carried out by the control device 15 in an automated manner, which accordingly comprises means for carrying out the method according to the invention. These means of the control device 15 are data interfaces, which serve for the data exchange with the assemblies involved in carrying out the method according to the invention, for example with the sensor 16 and 17 and 19 respectively, a processor for processing data and a storage unit for storing data.
List of reference numbers 10 Internal combustion power machine system 11 Internal combustion power machine 12 Internal combustion power machine 13 Exhaust gas after-treatment system 14 Shut-off device 15 Control device 16 Sensor 17 Sensor 18 Shut-off device 19 Sensor 20 Block 21 Block 22 Block 23 Block 24 Block 25 Block

Claims (9)

1. A method for operating a internal combustion power machine system (10), wherein the internal combustion power machine system (10) comprises at least two internal combustion power machines (11,12), in which fuel can be combusted subject to forming exhaust gas, and an exhaust gas after-treatment system (13) that is common to the at least two internal combustion power machines (11,12), in which the exhaust gas of the internal combustion power machines (11, 12) can be subjected to an exhaust gas after-treatment, wherein downstream of at least one of the internal combustion power machines (11, 12), which are assigned a common exhaust gas after-treatment system (13), and upstream of the common exhaust gas after-treatment system (13) a shut-off device (14, 18) is arranged which in particular when the respective internal combustion power machine (11, 12) is passive, is closed to avoid exhaust gas backflow from at least one other running internal combustion power machine (11, 12) in the direction of the respective passive machine (11,12), characterized in that with the help of at least one sensor (16,19) a gas composition and/or a gas temperature downstream of at least one passive internal combustion power machine (11, 12) and upstream of the respective closed shut-off device (14,18) is determined and in that dependent on this it is checked if there is exhaust gas backflow in the direction of the respective passive internal combustion power machine (11,12) despite closed shut-off device (14, 18).
2. The method according to claim 1, characterized in that, in particular when there is exhaust gas backflow in the direction of a passive internal combustion power machine (11, 12) with closed shut-off device (14, 18) assigned to the respective internal combustion power machine, a leakage of the respective shut-off device (14, 18) is inferred, and on the control side a measure, in particular an error message and/or measure for reducing the exhaust gas backflow, is triggered.
3. The method according to claim 1 or 2, characterized in that downstream of each internal combustion power machine (11,12) a shut-off device (14, 18) is positioned which in particular when the respective internal combustion power machine is passive is closed and in that downstream of each internal combustion power machine and upstream of the respective shut-off device at least one sensor (16,19) is positioned with the help of which sensor for each internal combustion power machine, a gas composition and/or a gas temperature is individually determined downstream of the respective internal combustion power machine and upstream of the respective shut-off device.
4. The method according to any one of the claims 1 to 3, characterized in that exhaust gas backflow in the direction of a passive internal combustion power machine (11, 12) with closed shut-off device (14,18) assigned to the respective internal combustion power machine is inferred when a characteristic quantity detected with the help of the sensor (16, 19) positioned between the respective internal combustion power machine (11, 12) and the respective shut-off device (14, 18) is greater than a limit value.
5. The method according to any one of the claims 1 to 4, characterized in that exhaust gas backflow in the direction of an internal combustion power machine (11, 12) with closed shut-off device (14,18) assigned to the respective internal combustion power machine is inferred in particular when an amount of a characteristic quantity detected with the help of the sensor (16, 19. positioned between the respective internal combustion power machine and the respective shut-off device amounts to at least 50 %, preferably at least 25 %, most preferably at least 10 % of an amount of a characteristic quantity detected with the help of a preferentially structurally identical sensor (17, 16, 19) positioned downstream of the closed shut-off device (14,18) or downstream of another running internal combustion power machine (11, 12).
6. The method according to any one of the claims 1 to 5, characterized in that the respective sensor (16, 17, 19) is designed as a lambda sensor and/or as NOx-sensor and/or as HC-sensor and/or as NH3-sensor and/or as CO-sensor and/or as CCVsensor and/or a temperature sensor and/or as exhaust gas particle sensor.
7. A control device (15) for an internal combustion power machine system (10), characterized in that the control device (15) comprises means for carrying out the method according to any one of the claims 1 to 6.
8. An internal combustion power machine system (10), with at least two internal combustion power machines (11,12), in which fuel can be combusted subject to forming exhaust gas, with an exhaust gas after-treatment system (13) that is common to at least two internal combustion power machines, in which the exhaust gas can be subjected to an exhaust gas after-treatment, wherein downstream of at least one of the internal combustion power machines, which are assigned a common exhaust gas after-treatment system, and upstream of the common exhaust gas after-treatment system a shut-off device (14, 18) is arranged, which for avoiding and exhaust gas backflow in the direction of the respective internal combustion power machine can be closed and with a control device (15) for controlling and/or regulating the operation of the internal combustion power machines, characterized in that, between the respective internal combustion power machine and the respective shut-off device, at least one sensor (16, 19) is positioned, with the help of which sensor a gas composition and/or a gas temperature downstream of the respective internal combustion power machine and upstream of the respective shut-off device can be determined, wherein the control device (15) based on input from the at least one sensor checks if there is exhaust gas backflow in the direction of the respective internal combustion power machine with the same being passive despite closed shut-off device.
9. The internal combustion power machine system (10) according to claim 8, characterized in that the control device (15) is designed according to claim 7.
DKPA201570216A 2014-04-15 2015-04-14 System af kraftmaskiner med indvendig forbrænding og styreindretning til styring heraf DK179059B1 (en)

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DE102014005515 2014-04-15
DE102014005515.9A DE102014005515A1 (en) 2014-04-15 2014-04-15 Combustion engine system and method and controller for operating the same

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DK179059B1 DK179059B1 (en) 2017-09-25

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JP (1) JP6495078B2 (en)
KR (1) KR102323264B1 (en)
CN (1) CN105041428B (en)
DE (1) DE102014005515A1 (en)
DK (1) DK179059B1 (en)
FI (1) FI128173B (en)

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