JP2015203418A - Internal combustion engine system, method of operating internal combustion engine system, and operation control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new operation method of an internal combustion engine system, a control device for the same, and the internal combustion engine system having the control device.SOLUTION: In a method of operating an internal combustion engine system 10, the system includes internal combustion engines 11, 12 burnable while generating exhaust gas by a fuel inside thereof, and an exhaust gas after-treatment system 13 shared by the internal combustion engines 11, 12, and capable of implementing exhaust gas after-treatment on the exhaust gas inside thereof. Shut-off devices 14, 18 are disposed at a downstream side of the internal combustion engines 11, 12 and an upstream side of the exhaust gas after-treatment system 13, the shut-off devices are closed to prevent backflow of the exhaust gas from the operated internal combustion engines 11, 12 to the stopped internal combustion engines 11, 12, and gas compositions/gas temperatures are specified at the downstream side of the stopped internal combustion engines 11, 12 and the upstream side of the closed shut-off devices 14, 18 by using sensors 16, 19, and thereby whether the backflow of the exhaust gas in the direction of the stopped internal combustion engines 11, 12 exists or not is detected.

Description

  The present invention relates to a method for operating an internal combustion engine system according to the preamble of claim 1. The invention further relates to a control device for carrying out the method and an internal combustion engine system comprising the control device.

  For example, in a ship, an internal combustion engine system including a plurality of internal combustion engines and a common exhaust gas aftertreatment system is used. That is, in the internal combustion engine system, the fuel is burned while simultaneously generating exhaust gas in a plurality of internal combustion engines, and the exhaust gas of the internal combustion engine is guided to exhaust gas post-treatment through a common exhaust gas post-treatment system.

  It is already known from practice that, in particular, when operating the internal combustion engine system at partial load, at least one internal combustion engine is stopped and only at least one other internal combustion engine is operated. In the internal combustion engine in which the internal combustion engine system is stopped, at least such a stop can be performed in order to prevent the exhaust gas of the operating internal combustion engine from flowing back into the area of the stopped internal combustion engine. It is already known from practice that a shut-off device can be arranged in the internal combustion engine of the internal combustion engine system and that the shut-off device can be used to avoid the backflow of exhaust gas in the direction of the stopped internal combustion engine. For this purpose, each shut-off device is closed.

  Especially when the internal combustion engine system is in operation due to wear of the shut-off device, particularly when the internal-combustion engine is stopped and the shut-off device arranged in the internal combustion engine is closed, it is nevertheless closed A state may occur in which a backflow of exhaust gas passing through the shut-off device occurs. In this case, corrosion problems may arise by the exhaust gas reaching the area of the internal combustion engine where it is stopped, and as a result, particularly when sulfuric acid falls into the internal combustion engine assembly where it is stopped. To date, no means has been known that can safely and reliably detect the backflow of exhaust gas that passes through a closed shut-off device disposed in a stopped internal combustion engine.

  Starting from here, an object of the present invention is to provide a new operating method of an internal combustion engine system, a control device for executing the method, and an internal combustion engine system having the control device.

  This problem is solved by the method according to claim 1.

  In accordance with the present invention, the gas composition and / or the downstream of at least one stopped internal combustion engine and upstream of the closed shut-off device disposed in each stopped internal combustion engine using at least one sensor. Alternatively, the gas temperature is identified and based on this, it is checked whether there is a backflow of exhaust gas in the direction of each stopped internal combustion engine, regardless of the shut-off device that is closed.

  For the first time, the present invention determines whether or not the closed shut-off device arranged in the stopped internal combustion engine is not sealed, and therefore there is a backflow of exhaust gas in the direction of each stopped internal combustion engine. An operation method of an internal combustion engine system that can be detected safely and reliably is provided. Thereby, in order to avoid the problem of corrosion in a stopped internal combustion engine, it is possible to take measures when a backflow of exhaust gas is detected.

  In particular, when the shut-off device disposed in each internal combustion engine is closed, if there is a backflow of exhaust gas in the direction of the internal combustion engine, it is presumed that each shut-off device is not sealed. Measures are introduced, in particular measures for reducing error messages and / or exhaust gas backflow. This can reduce the risk of corrosion in a stopped internal combustion engine.

  According to a further advantageous configuration, the value of the parameter detected using a sensor arranged between each internal combustion engine that is stopped and each shut-off device that is closed is downstream of the shut-off device or other active If at least X%, in particular at least 50%, preferably at least 25%, most preferably at least 10% of the value of the parameter detected using a sensor of the same structure, arranged downstream of the internal combustion engine, In the closed shut-off device provided in each internal combustion engine, a back flow of exhaust gas in the direction of the internal combustion engine is estimated. This enables a particularly advantageous detection of the backflow of exhaust gas in the direction of the stopped internal combustion engine via the closed shut-off device.

  The control device is defined in claim 7, and the internal combustion engine system is defined in claim 8.

  Preferred further configurations of the invention emerge from the subclaims and the following description. Embodiments of the present invention will be described in detail with reference to the drawings without being limited thereto. Shown is the following drawing.

1 is a schematic view of a first internal combustion engine system. 2 is a schematic diagram of a second internal combustion engine system. 3 is a schematic diagram of a third internal combustion engine system. It is a flowchart of the signal of the operating method of an internal combustion engine system.

  The present invention relates to a method for operating an internal combustion engine system, a control device for executing the method, and an internal combustion engine system.

  FIG. 1 is a schematic diagram of a first internal combustion power machine system 10 according to the present invention having two internal combustion engines 11, 12. The internal combustion engines 11 and 12 shown in FIGS. 1 and 2 are combustion engines (combustion engines), preferably marine diesel combustion engines. Here, it should be pointed out that the present invention is not limited to an internal combustion engine system using an internal combustion engine. Rather, the present invention can also be used in an internal combustion engine system in which the internal combustion engine is configured as a turbo machine such as a gas turbine.

  In the internal combustion engine 11, 12 of the internal combustion engine system 10, the fuel is burned while forming exhaust gas, and the exhaust gas of the internal combustion engine 11, 12 can be guided to the exhaust gas aftertreatment of the exhaust gas through the common exhaust gas aftertreatment device 13. .

  In the embodiment of FIG. 1, a shutoff device 14 is disposed in the internal combustion engine 11. The shut-off device is arranged downstream of the internal combustion engine 11 so that when the internal combustion engine 11 stops when the internal combustion engine 12 is running, the internal combustion engine 11 is disconnected from the exhaust gas flow and is therefore in operation. It is possible to prevent the exhaust gas from the internal combustion engine 12 from flowing backward in the direction of the internal combustion engine 11 that is stopped. The blocking device 14 is generally a blocking flap or the like. Further, FIG. 1 shows a control device 15, through which the operation of the internal combustion engines 11, 12 can be controlled and / or adjusted, as indicated by the dashed arrows in FIG. 1. Further, the shut-off device 14 can be opened and closed depending on whether the internal combustion engine 11 is stopped or operating through the device. Therefore, when the internal combustion engine 11 is stopped and the internal combustion engine 12 is operating, the shutoff device 14 disposed in the internal combustion engine 11 is automatically closed through the control device 15.

  According to FIG. 1, in the embodiment of FIG. 1, downstream of the internal combustion engine 11, which can be stopped when the internal combustion engine 12 is operating, and upstream of the shut-off device 14 provided in the stopable internal combustion engine 11. The sensor 16 is arranged. With this sensor, the gas composition and / or the gas temperature can be determined downstream of the internal combustion engine 11 that is stopped and upstream of the shut-off device 14 that is closed.

  In response to this, when the internal combustion engine 12 is operating, the internal combustion engine 11 is stopped, and the shut-off device 14 is closed, the shut-off device 14 is closed but the shut-off device 14 is closed. It is inspected whether there is a backflow of exhaust gas in the direction of the internal combustion engine 11. This inspection is automatically performed by the control device 15.

  When the shut-off device 14 disposed in the stopped internal combustion engine 11 is closed, if a backflow of exhaust gas in the direction of the stopped internal combustion engine 11 exists or is detected, on the control side , It is estimated that the shut-off device 14 is not sealed, and measures are taken on the control side. The measure is, for example, an error message or a message for starting maintenance or replacement of the shut-off device 14. Alternatively or additionally, measures can be taken on the control side to reduce or avoid the backflow of exhaust gas in the direction of a stopped internal combustion engine. Therefore, for example, it is possible to operate the internal combustion engine 11 that has been stopped and / or to reduce the output of the operating internal combustion engine 12.

  As already explained, the sensor 16 is used to check the gas composition and / or the gas temperature downstream of the stopped internal combustion engine 11 and upstream of the closed shut-off device 14, so that the gas composition and / or Based on the gas temperature, the backflow of the exhaust gas in the direction of the stopped internal combustion engine 11 through the closed shut-off device 14 is estimated. If the parameter detected using the sensor 16 is greater than a specific limit value, the backflow of exhaust gas in the direction of the stopped internal combustion engine 11 through the closed shut-off device 14 is estimated. The limit value can be stored permanently in the control device 15, for example.

  FIG. 2 shows a further configuration of the internal combustion engine system 10 of FIG. 1, in which a further sensor 17 is arranged upstream of the exhaust gas aftertreatment system 13 and downstream of the shut-off device 14. Can be used to detect the gas composition and / or gas temperature upstream of the exhaust gas aftertreatment system 13. Since the sensor 17 is preferably a sensor of the same structure as the sensor 16, the same parameters, for example parameters relating to gas composition and / or gas temperature, can be detected by the sensors 16 and 17 of FIG.

  In the embodiment of FIG. 2, the limit value is dynamically determined based on the parameter detected by the sensor 17, and based on the limit value, the exhaust gas is passed through the shut-off device 14 closed in the stopped internal combustion engine 11. It is detected on the control side whether or not a reverse flow has occurred. In the embodiment of FIG. 2, the value of the parameter detected using the sensor 16 is X% of the same parameter value detected using the sensor 14, in particular at least 50%, preferably at least 25%, most preferably If it is at least 10%, the internal combustion engine 12 is preferably running, the internal combustion engine 11 is stopped, and the internal combustion engine 11 is stopped through the closed shut-off device 14 when the shut-off device 14 is closed. A backflow of exhaust gas in the direction of the engine 11 is detected. In other words, in FIG. 2, when the internal combustion engine 11 is stopped and the shut-off device 14 is closed, this is closed with the parameter detected by the sensor 16 arranged upstream of the closed shut-off device 14. If the ratio between the parameters detected by the sensor 17 arranged downstream of the shut-off device 14 is greater than the limit value, i.e. greater than X%, the internal combustion engine that has stopped through the closed shut-off device 14 This means that a backflow of exhaust gas in the direction of the engine 11 is detected. The limit value can depend, for example, on the load, that is to say on the load when operating the internal combustion engine system.

  In the embodiment of FIGS. 1 and 2, the shut-off device 14 is arranged only in one of the illustrated internal combustion engines 11, 12. On the other hand, FIG. 1 shows a further configuration of the internal combustion engine system 10 of FIG. 1. In this configuration, the internal combustion engine 12 includes a shutoff device 18, an upstream of the shutoff device 18, and a downstream of the internal combustion engine 12. The sensor 19 for specifying the gas composition and / or the gas temperature is arranged. If both internal combustion engines 11, 12 of the internal combustion engine system 10 can be stopped alternately while the other internal combustion engine is running, the variant of FIG. 3 is preferred. FIGS. 1 and 2 are preferred when one internal combustion engine runs permanently and the other internal combustion engine operates as needed. In the modified example of FIG. 3, each internal combustion engine 11, 12 can be stopped when the other internal combustion engine 12, 11 is operating, and the internal combustion engine 11, 12 that is stopped is arranged. The installed shut-off devices 14, 18 can be closed, respectively, so that the tightness of each shut-off device 14 and 18 closed can be checked using the sensors 16 and 19, respectively. Each sensor 19 and 16 of the other, preferably the same type, each disposed on the other running internal combustion engine is used to determine a limit value and is disposed on the stopped internal combustion engine. When the limit value is exceeded or the limit value is reached in the sensor signal, it is estimated that the shut-off devices 14 and 18 disposed in the internal combustion engine are not sealed.

As already explained, the sensors 16, 17, 19 are sensors for specifying the gas composition and / or the gas temperature. The sensors are preferably lambda sensors and / or NOx sensors and / or HC sensors and / or NH ₃ sensors and / or CO sensors and / or CO ₂ sensors or temperature sensors or exhaust gas particle sensors and / or other sensors. Is available.

  FIG. 4 is a signal flowchart of the method according to the invention for operating an internal combustion engine system according to the invention. Block 20 of FIG. 4 shows the starting point of the method according to the invention.

  In block 21, whether one of the internal combustion engines in which the common exhaust gas aftertreatment system of the internal combustion engine system is disposed is stopped, and another internal combustion engine that uses the same exhaust gas aftertreatment system. It is checked whether or not is running. Otherwise, return to block 21. On the other hand, if this is the case, that is, at least one of the internal combustion engines of the internal combustion engine system in which the common exhaust gas aftertreatment system is arranged is stopped and another internal combustion engine of the internal combustion engine system is stopped. If is running, proceed from block 21 to block 22.

  In block 22, the signal of a sensor located in an internal combustion engine that is stationary in the internal combustion engine system is evaluated. In the following block 23, it is checked whether the signal or parameter of the sensor arranged in the internal combustion engine in which the internal combustion engine system is stopped exceeds a limit value.

  Otherwise, start at block 23 and return to block 23. On the other hand, if the limit value is reached or exceeds the limit value, the process proceeds from block 23 to block 24, and measures such as an error message are introduced on the control side.

  Subsequently, at block 25, the method according to the invention ends.

  According to the invention, at least one of the sensors 16 and 19 is used to close each shut-off device 14 disposed downstream of at least one stopped internal combustion engine and to each stopped internal combustion engine 14 and Upstream of 18, the gas composition and / or gas temperature is specified and, based on the signal of the sensor, the exhaust gas in the direction of each stopped internal combustion engine in the control device 15 irrespective of the shut-off device closed It is checked whether there is any backflow.

  The method is automatically performed by the control device 15 having means for performing the method according to the invention. The means of the control device 15 comprises, for example, a data interface used for exchanging data with the assembly involved in the implementation of the method according to the invention, such as each sensor 16 and 17 and 19, a processor for processing the data, and storing the data Storage device.

DESCRIPTION OF SYMBOLS 10 Internal combustion engine system 11 Internal combustion engine 12 Internal combustion engine 13 Exhaust gas aftertreatment 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)

A method for operating an internal combustion engine system (10), the internal combustion engine system (10) comprising at least two internal combustion engines (11, 12) in which the fuel can burn while producing exhaust gas, And an exhaust gas aftertreatment system (13) common to at least two internal combustion engines (11, 12) capable of performing exhaust gas aftertreatment on the exhaust gas of the internal combustion engine (11, 12). , Downstream of at least one of the internal combustion engines (11, 12) in which the common exhaust gas aftertreatment system (13) is disposed, and upstream of the common exhaust gas aftertreatment system (13) Is provided with a shut-off device (14, 18), said shut-off device being at least one other in operation, in particular when each said internal combustion engine (11, 12) is stopped. From the engine (11, 12), in the methods it closed in order to avoid the backflow of exhaust gas in the direction of the respective stop and that the internal combustion engine (11, 12),
Using at least one sensor (16, 19), the gas composition and / or gas temperature is at least one downstream of the stopped internal combustion engine (11, 12) and the respective closed shut-off device (14). , 18) upstream of the exhaust gas in the direction of the stopped internal combustion engine (11, 12) in spite of the shut-off device (14, 18) being identified and closed accordingly. A method characterized in that it is checked whether or not there exists.   When the shut-off device (14, 18) disposed in each of the internal combustion engines is closed, there is a backflow of exhaust gas particularly in the direction of the internal combustion engine (11, 12) that is stopped. It is assumed that each of the shut-off devices (14, 18) is not sealed and measures are taken on the control side, in particular measures to reduce error messages and / or exhaust gas backflow The method of claim 1. Downstream of each internal combustion engine (11, 12) is arranged the shut-off device (14, 18) which is closed especially when the internal combustion engine is stopped respectively, and
At least one sensor (16, 19) is disposed downstream of each internal combustion engine and upstream of each shut-off device, and each of the internal combustion engines is used for each internal combustion engine using the sensor. 3. A method according to claim 1 or 2, characterized in that the gas composition and / or the gas temperature are specified individually downstream of the internal combustion engine and upstream of the respective shut-off device.   When the parameter detected using the sensors (16, 19) disposed between each of the internal combustion engines (11, 12) and each of the shut-off devices (14, 18) is larger than a limit value, When the shut-off device (14, 18) disposed in the internal combustion engine is closed, a back flow of exhaust gas in the direction of the stopped internal combustion engine (11, 12) is estimated. The method according to any one of claims 1 to 3.   In particular, the value of the parameter detected using the sensors (16, 19) arranged between each of the internal combustion engines and each of the shut-off devices is downstream of the shut-off device (14, 18) closed or others. At least 50%, preferably at least at least 50% of the value of the parameter detected using a sensor (17, 16, 19), preferably of the same structure, arranged downstream of said internal combustion engine (11, 12) in operation If it is 25%, most preferably at least 10%, in the direction of the internal combustion engine (11, 12) when the shut-off device (14, 18) arranged in the respective internal combustion engine is closed The method according to claim 1, wherein a backflow of exhaust gas is estimated. Said sensor (16, 17, 19), respectively, the lambda sensor and / or NOx sensor and / or HC sensor and / or NH ₃ sensor and / or CO sensor and / or CO ₂ sensor and / or temperature sensors and / or exhaust gas The method according to claim 1, wherein the method is configured as a particle sensor.   A control device (15) for an internal combustion engine system (10), characterized in that it comprises means for carrying out the method according to any one of the preceding claims. At least two internal combustion engines (11, 12) in which the fuel can burn while producing exhaust gas,
An exhaust gas aftertreatment system (13) common to at least two internal combustion engines capable of performing exhaust gas aftertreatment on the exhaust gas therein, wherein the exhaust gas aftertreatment system is provided in common A shut-off device (14, 14) that can be closed downstream of at least one internal combustion engine of the engine and upstream of the common exhaust aftertreatment system to avoid backflow of exhaust gas in the direction of the respective internal combustion engine. An exhaust gas aftertreatment system (13) in which 18) is arranged;
A control device (15) for controlling and / or adjusting the operation of the internal combustion engine;
In an internal combustion engine system (10) having
Between each said internal combustion engine and each said shut-off device, at least one sensor (16, 19) is arranged, using said sensor, the gas composition and / or the gas temperature is Can be specified downstream of the internal combustion engine and upstream of each of the shut-off devices, and the control device (15) is provided when each of the internal combustion engines is stopped in spite of the shut-off device closed. An internal combustion engine system (10) characterized in that it is checked whether there is a backflow of exhaust gas in the direction of the internal combustion engine.   9. Internal combustion engine system according to claim 8, characterized in that the control device (15) is configured according to claim 7.

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