• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A method for preparing to start and preferably for then starting an internal combustion engine (10) designed as a gas engine or an internal combustion engine (10) designed as a dual-fuel motor with a gaseous fuel, wherein the internal combustion engine (10) has at least one group (11) of cylinders (12), wherein the group (11) of cylinders (12) can be supplied with a gaseous fuel via a fuel supply system (13), which has a cylinder group-individual fuel supply line (14), cylinder-individual fuel supply lines (15) branching from the cylinder group-individual fuel supply line (14) and leading to the cylinders (12) of the respective group (11), a cylinder group-individual fuel supply valve (16), cylinder-individual fuel supply valves (17) and a vent valve (18), wherein the fuel supply system (13) can be rinsed with a rinsing medium, in particular with air or inert gas such as nitrogen, via a rinsing system (20) with the vent valve (18) open. In step a), given a closed cylinder group-individual fuel supply valve (16), given closed cylinder-individual fuel supply valves (17), and given a closed vent valve (18), the fuel supply system (13) from which gaseous fuel had previously been vented is filled with rinsing medium in a defined manner, and monitoring is performed to determine whether a pressure prevailing in the fuel supply system (13) lies within a defined pressure range for a defined length of time. If it is determined in step a) that the pressure prevailing in the fuel supply system (13) lies in the defined pressure range for the defined length of time, the fuel supply system (13) is then filled with gaseous fuel in a subsequent step b).
    公开号:FI20186095A1
    申请号:FI20186095
    申请日:2018-12-17
    公开日:2019-06-21
    发明作者:Sascha Stoll；Stefan Terbeck；Hans-Philipp Walther
    申请人:Man Energy Solutions Se；
    IPC主号:
    专利说明:

    MAN Diesel & Turbo SE
    Method for Preparing to Start and preferably for then Starting an Internal Combustion Engine Designed as a Gas Engine or Dual-Fuel Motor
    The invention relates to a method for preparing to start and preferably for then starting an internal combustion engine designed as a gas engine or dual-fuel motor.
    The basic structural design and basic function of an internal combustion engine designed as a gas engine or dual-fuel motor are familiar to the expert here being addressed. A gas engine typically has several cylinders, in which exclusively gaseous fuel, for example methane, is combusted. A dual-fuel motor typically also has several cylinders, in which a liquid fuel such as diesel can be combusted in a first operating mode, and a gaseous fuel such as methane can be combusted in a second operating mode. The cylinders of a gas engine or the cylinders of a dual-fuel motor are typically arranged in at least one group comprised of several cylinders.
    The gaseous fuel can be supplied to each group of cylinders via a cylinder group-individual fuel supply line, wherein cylinder-individual fuel supply lines branch from the cylinder group-individual fuel supply line, and bind the respective cylinders of a group to the cylinder group-individual fuel supply line. The cylinder group-individual fuel supply line and cylinder group-individual fuel supply lines are components of a fuel supply system for the gaseous fuel, which per group of cylinders further has a cylinder groupindividual fuel supply valve, cylinder-individual fuel supply valves and a vent valve.
    In a gas engine, the fuel supply system for the gaseous fuel, namely the cylinder group-individual fuel supply line, is usually filled with gaseous fuel during regular operation, specifically even when the gas engine is shut down. In order to perform maintenance work, however, the fuel supply system, namely the cylinder group-individual fuel supply line, is vented by way of a rinsing system with the vent valve of the fuel supply system open, so that the respective cylinder group-individual fuel supply line must be filled with gaseous fuel before then starting the gas engine. In a dual-fuel motor, the fuel supply system for the gaseous fuel, namely the cylinder group-individual fuel supply line, is filled with gaseous fuel only when actually combusting gaseous fuel in the cylinders. If liquid fuel, such as diesel, is combusted in the
    PB05944DE
    20186095 prh 17-12-2018 cylinders of a dual-fuel motor instead, the fuel supply system for the gaseous fuel, namely the cylinder group-individual fuel supply line, is usually vented and in particular filled with air or nitrogen. In order to switch from an operating mode of the dual-fuel motor in which liquid fuel is combusted in the dual-fuel motor into an operating mode in which gaseous fuel is combusted in the dual-fuel motor, the respective cylinder group-individual fuel supply line must be filled with gaseous fuel in a defined manner.
    There have to date been difficulties in properly starting a gas engine after performing maintenance work with a fuel supply line from which gaseous fuel has been evacuated and a dual-fuel motor when switching from the liquid fuel operating mode into the gas fuel operating mode. Therefore, there exists a need for a method for preparing to start an internal combustion engine designed as a gas engine or dual-fuel motor, which makes it possible to safely and reliably start the gas engine or dual-fuel motor with the gaseous fuel when the gaseous fuel has been evacuated or vented from the fuel supply system for the gaseous fuel, in particular from the respective cylinder group-individual fuel supply line.
    Proceeding from the above, the object of the present invention is to provide a novel method for preparing to start an internal combustion engine designed as a gas engine or dual-fuel motor.
    This object is achieved by a method according to claim 1.
    In step a), given a closed cylinder group-individual fuel supply valve, given closed cylinder-individual fuel supply valves, and given a closed vent valve, the fuel supply system from which gaseous fuel had previously been vented is filled with rinsing medium in a defined manner, and monitoring is performed to determine whether a pressure prevailing in the fuel supply system lies within a defined pressure range for a defined length of time. If it is determined in step a) that the pressure prevailing in the fuel supply system lies in the defined pressure range for the defined length of time, the fuel supply system is then filled with gaseous fuel in a subsequent step b). If it is determined in step a) that the pressure prevailing in the fuel supply system does not lie in the defined pressure range for the defined length of time, the start preparation process is preferably interrupted.
    The invention present here is used prior to the actual process of starting the internal combustion engine in a start preparation process to check whether the fuel supply system for the gaseous fuel has a leak or has no leak. To this end, no gaseous fuel is introduced into the fuel supply system, but rather exclusively
    PB05944DE
    20186095 prh 17-12-2018 a rinsing medium, in particular air or inert gas such as nitrogen. To this end, the cylinder group-individual fuel supply line is preferably pressurized by the rinsing medium, wherein a check is performed to determine whether the pressure lies within the defined pressure range or not.
    If the pressure lies within the defined pressure range for the defined length of time, it is concluded that no leak is present, so that the internal combustion engine can then be safely and reliably started, specifically without the risk of ignition or evaporation of any gaseous fuel that would otherwise arise given a leak in the cylinder of the internal combustion engine or in an exhaust tract of the internal combustion engine.
    If it is found during the above pressure check that the pressure prevailing in the fuel supply system, in particular in the cylinder group-individual fuel supply line, does not lie in the defined pressure range for the defined length of time, it is concluded that a leak is present in the fuel supply system, wherein the start preparation process is then preferably interrupted to avert any danger when starting the internal combustion engine.
    Step a) preferably involves acquiring and evaluating the pressure prevailing in the cylinder groupindividual fuel supply line of the fuel supply system. This enables an especially simple and reliable leak check.
    Preferred further developments of the invention may be gleaned from the subclaims and following description. Exemplary embodiments of the invention will be explained in more detail based on the drawing, without being limited thereto. Shown here on:
    Fig. 1 is a block diagram of an internal combustion engine;
    Fig. 2 is a block diagram of another internal combustion engine.
    The invention relates to a method for preparing to start an internal combustion engine designed as a gas engine or an internal combustion engine designed as a dual-fuel motor, and preferably for then starting the internal combustion engine with a gaseous fuel.
    PB05944DE
    20186095 prh 17-12-2018
    The method according to the invention will be described below with reference to Fig. 1 and 2. The highly schematized view of the internal combustion engines 10 shown on Fig. 1 and 2 each have a group 11 comprised of cylinders 12 arranged in a row. The group 11 of cylinders 12 can be supplied with a gaseous fuel via a cylinder group-individual fuel supply line 14 of a fuel supply system 13 for the gaseous fuel, wherein the cylinder group-individual fuel supply line 14 has branching from it cylinder-individual fuel supply lines 15, which can supply the gaseous fuel to the individual cylinders 12 proceeding from the cylinder group-individual fuel supply line 14. On Fig. 1, the cylinder group-individual fuel supply line 14 has allocated to it a cylinder group-individual fuel supply valve 16. When the cylinder groupindividual fuel supply valve 16 is open, the cylinder group-individual fuel supply line 14 can be filled with gaseous fuel.
    Each cylinder-individual fuel supply line 15 has allocated to a cylinder-individual fuel supply valve 17, or as an alternative this cylinder-individual fuel supply valve 17 is allocated to the respective cylinder 12. Depending on whether a cylinder-individual fuel supply valve 17 is open or closed, and if the cylinder group-individual fuel supply line 14 is filled with gaseous fuel, the gaseous fuel can be supplied to the respective cylinder 12 proceeding from the cylinder group-individual fuel supply line 14.
    Fig. 1 and 2 each show a state of the respective internal combustion engine 10 in which no gaseous fuel is present in the fuel supply system 13, and hence in the cylinder group-individual fuel supply line 14, with the cylinder group-individual fuel supply line 14 on Fig. 1 and 2 instead having the gaseous fuel evacuated therefrom, and being filled with a rinsing medium, for example with ambient air or inert gas, such as nitrogen N2.
    The invention present here now relates to such details of a method for preparing to start and possibly then starting such an internal combustion engine, with which the internal combustion engine can be safely and reliably started with gaseous fuel, specifically from a vented state of the fuel supply system 13, i.e., after emptying the gaseous fuel from the cylinder group-individual fuel supply line 14 beforehand, in particular via the vent valve 18.
    In the invention present here for start preparation, in a first step a), given a closed cylinder groupindividual fuel supply valve 16, given closed cylinder-individual fuel supply valves 17, and given a closed vent valve 18, the fuel supply system 13 from which gaseous fuel had previously been vented, namely the previously vented cylinder group-individual fuel supply line 14, is filled with rinsing medium in a
    PB05944DE
    20186095 prh 17-12-2018 defined manner, so that a defined pressure arises inside of the cylinder group-individual fuel supply line 14.
    The pressure in the fuel supply system 13, namely the cylinder group-individual fuel supply line 14, is monitored, specifically to determine whether the pressure prevailing in the fuel supply system 13, namely the cylinder group-individual fuel supply line 14, lies within a defined pressure range for a defined length of time. This pressure is acquired with a pressure sensor 19, which acts on the cylinder group-individual fuel supply line 14.
    The rinsing medium introduced into the cylinder group-individual fuel supply line 14 by a rinsing system 20 is a gaseous rinsing medium, in particular air or inert gas such as nitrogen. The rinsing medium can also be referred to as the testing medium.
    If it is determined in step a) that the pressure prevailing in the fuel supply system 13, namely the cylinder group-individual fuel supply line 14, lies in the defined pressure range for the defined length of time, it is concluded that the fuel supply system 13 for the gaseous fuel is free of leaks, wherein the fuel supply system 13 is then filled in a conventional manner with gaseous fuel in a subsequent step b), so as to start the internal combustion engine 10 with the gaseous fuel after the second step b) in an ensuing third step c).
    By contrast, if it is determined in the first step a) that the pressure prevailing in the fuel supply system 13, namely the cylinder group-individual fuel supply line 14, does not lie in the defined pressure range for the defined length of time, the start preparation process is interrupted, since it is then concluded that the fuel supply system 13 has a leak, and the internal combustion engine 10 cannot be started without risk. In addition, a warning message is preferably generated.
    In the exemplary embodiment of an internal combustion engine 10 shown on Fig. 1, the fuel supply system 13 that previously had gaseous fuel vented or evacuated from it is automatically filled in a defined manner, specifically the cylinder group-individual fuel supply line 14 is filled, with rinsing medium by actuating a shutoff device 21 of the rinsing system 20. When the shutoff device 21 is closed, the rinsing system 20 is separated from the cylinder group-individual fuel supply line 14. In this case, no rinsing medium can then get into the cylinder group-individual fuel supply line 14. By contrast, if the
    PB05944DE shutoff device 21 of the rinsing system 20 is open, rinsing medium gets into the cylinder groupindividual fuel supply line 14, wherein the defined pressure hereby builds up in the cylinder groupindividual fuel supply line 14 when the valves 16, 18 are closed.
    Fig. 2 shows an embodiment of an internal combustion engine in which the fuel supply system 13 that previously had gaseous fuel vented or evacuated from it, specifically the cylinder group-individual fuel supply line 14 that had previously been vented or evacuated, is manually filled in a defined manner with the rinsing medium, specifically by manually hooking up the rinsing system 20 to the fuel supply system 13, specifically to a connecting piece of the cylinder group-individual fuel supply line 14 (not shown), wherein this connecting piece preferably accommodates a non-actuatable check valve.
    Therefore, the invention present here can be used for preparing to start a gas engine or dual-fuel motor in a defined manner, specifically before starting the gas engine or dual-fuel motor. Leak checks are performed exclusively with rinsing medium, in particular air or inert gas such as nitrogen, i.e., no gaseous fuel. This makes it possible to increase the level of safety by comparison to methods that use the gaseous fuel to check for leaks.
    20186095 prh 17-12-2018
    PB05944DE
    Reference List
    Internal combustion engine
    Group
    Cylinder
    Fuel supply system
    Cylinder group-individual fuel supply line
    Cylinder-individual fuel supply line
    Cylinder group-individual fuel supply valve
    Cylinder-individual fuel supply valve
    Vent valve
    Pressure sensor
    Rinsing system
    Shutoff element
    20186095 prh 17-12-2018
    权利要求:
    Claims (7)
    [1]
    The claims
    A method for preparing the start of an internal combustion engine (10) and preferably starting it with a gaseous fuel which is designed to be a gas engine or a bi-fuel engine,
    Wherein the internal combustion engine (10) has at least one group of cylinders (12) and wherein the group (11) of cylinders (12) is supplied with gaseous fuel through a fuel supply system (13) having a cylinder group specific fuel supply line from the cylinder group-specific fuel supply line (14) and leading to the cylinders (12) of the group (11), the cylinder group-specific fuel supply valve (16), the cylinder-specific fuel supply valves (17) and such as nitrogen, through the flushing system (20) when the vent valve (18) is open, through the following steps:
    in step a) a certain closed cylinder group specific fuel supply valve (16), a defined closed cylinder specific fuel supply valve (17), and a defined closed vent valve (18), the fuel supply system (13) if the pressure in the fuel supply system (13) is within a given pressure range for a predetermined period, if it is determined in step a) that the pressure in the fuel supply system 25 (13) is within a predetermined pressure range;
    [2]
    Method according to Claim 1, characterized in that the combustion engine (10) is started by a gaseous fuel in the following:
    30 in step c).
    [3]
    Method according to Claim 1 or 2, characterized in that if in the first step a) it is determined that the pressure in the fuel supply system (13) is not within a certain pressure range for a predetermined time, the start preparation process is interrupted.
    35
    [4]
    Method according to one of Claims 1 to 3, characterized in that the pressure in the cylinder group-specific fuel supply line (14) of the fuel supply system (13) is obtained and estimated in step a).
    [5]
    Method according to one of Claims 1 to 4, characterized in that the fuel supply system (13), from which a gaseous fuel
    The substance, previously vented, is automatically filled with the rinse aid in the prescribed manner using the shut-off valve (21) of the rinsing system (20).
    [6]
    Method according to one of Claims 1 to 4, characterized in that the fuel supply system (13), from which the gaseous fuel has previously been ventilated, is manually filled in a purged manner.
    [7]
    10, with the fuel system connected to the flushing system (20) [13].
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    KR20090013362A|2007-08-01|2009-02-05|콘티넨탈 오토모티브 시스템 주식회사|Method for diagnosing fuel leakage of bi fuel car|
    KR20130086050A|2010-12-24|2013-07-30|카와사키 주코교 카부시키 카이샤|Gas fuel leakage detection method, and gas fuel leakage detection device, and gas engine equipped with same|
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    EP2915986B1|2014-03-07|2019-05-08|Caterpillar Motoren GmbH & Co. KG|Evaluating air-tightness of a gaseous fuel manifold during purge gas flushing|
    EP2963269B1|2014-07-01|2017-02-01|Caterpillar Motoren GmbH & Co. KG|Method of supplying fuel to engine|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE102017130642.0A|DE102017130642A1|2017-12-20|2017-12-20|Method for starting preparation and preferably for the subsequent starting of a designed as a gas engine or dual-fuel engine internal combustion engine|
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