JP2013238220A - Combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spark ignition gas engine, directly igniting relatively lean fuel mixture surely and reliably in a combustion chamber of a cylinder of a combustion engine to eliminate a pre-combustion chamber.SOLUTION: A combustion engine is for burning relatively lean fuel mixture made from gaseous fuel and air, that is, a spark ignition gas engine. At least one cylinder (10) is provided thereto, and a combustion chamber (11) is defined by the cylinder (10) or respective cylinders (10). The combustion chamber is restricted by a piston (12) of the cylinder supported to be stroked on one side thereof, but is restricted by a flame deck (13) on the opposed side. In the flame deck (13), at least one inlet valve (15, 16) for the fuel mixture made from the gaseous fuel and air, and at least one outlet valve (17, 18) for exhaust gas are disposed. A plurality of ignition systems (21) are disposed to be dispersed on the flame deck (13), and the ignition devices are used for directly igniting the fuel mixture in the combustion chamber (11) of each cylinder (10).

Description

  The present invention relates to a combustion engine according to the superordinate concept of claim 1, that is, a spark ignition gas engine.

  A gas engine is a combustion engine driven solely by gaseous fuel. Therefore, the gas engine is basically divided into a spark ignition gas engine in which the fuel mixture is ignited by an ignition device, in particular by a spark plug, and a diesel gas engine in which the fuel mixture is ignited by self-ignition of the injected ignition oil. Differentiated. The present invention relates to a spark ignition gas engine.

  From patent document 1, a combustion engine configured as a spark ignition gas engine is known, in which combustion of a fuel mixture is performed in a pre-combustion chamber of each cylinder of the combustion engine, The cylinders are connected to the respective combustion chambers.

  A spark ignition gas engine having such a precombustion chamber is structurally expensive, and therefore a spark ignition gas engine having no precombustion chamber is required.

  Until now, it has been difficult to ignite a gaseous fuel mixture directly in the combustion chamber of a cylinder of a spark ignition gas engine. Especially when the spark ignition gas engine is a large gas engine, It is particularly difficult to ignite and burn a lean fuel mixture.

  The present invention, when the spark ignition gas engine itself is configured as a large gas engine, can ignite a relatively lean fuel mixture directly and reliably in the combustion chamber of the cylinder of the combustion engine, Thus, a spark ignition gas engine is proposed in which the pre-combustion chamber can be omitted.

German Patent Application Publication No. 10 2008 018 482

  Starting from here, the problem underlying the present invention is to provide a new combustion engine.

  This problem is solved by a combustion engine according to claim 1. According to the invention, a plurality of ignition devices are arranged on the flame deck of each cylinder and these ignition devices are used to directly ignite the fuel mixture in the combustion chamber of each cylinder. . A plurality of ignition devices are distributed and arranged on the flame deck, so that the fuel mixture can be ignited directly and reliably in the combustion chamber of each cylinder. Even when configured as a large gas engine, it will ignite a relatively lean fuel mixture. The combustion engine according to the invention is characterized by a fast and controlled combustion of the fuel mixture, which reduces the risk of so-called knocking. By omitting the pre-combustion chamber that has been necessary so far, the manufacturing cost and the maintenance cost can be reduced. The combustion engine can be driven thermodynamically efficiently with reduced NOx emissions.

  Preferably, two inlet valves for a fuel mixture consisting of gaseous fuel and air and two outlet valves for exhaust gas are mounted in the flame deck, and each inlet valve and each outlet valve Each of the flame decks is disposed within one individual quadrant, and a plurality of igniters are disposed along a virtual separation line of the flame deck quadrant. It is particularly advantageous to arrange the ignition device in this way along the flame deck with respect to the inlet and outlet valves.

  In an advantageous refinement of the invention, two inlet valves for a fuel mixture consisting of gaseous fuel and air and two outlet valves for exhaust gas are mounted in the flame deck, each inlet valve And each outlet valve is disposed along an axis extending through the midpoint of each valve, and a plurality of ignition devices are disposed along this axis. It is also particularly advantageous to arrange the ignition device in this way with respect to the inlet and outlet valves along the flame deck.

  Preferably, the plurality of ignition devices are distributed in the flame deck in a rotationally symmetrical manner with respect to the stroke axis of the piston. By arranging the ignition device rotationally symmetrically with respect to the inlet valve and the outlet valve with respect to the stroke axis of the piston, a particularly advantageous ignition of the lean fuel mixture takes place.

  Preferred refinements of the invention are evident from the dependent claims and the following description. The embodiments of the present invention will be described in detail with reference to the drawings without being limited thereto.

1 is a schematic view of a cylinder of a combustion engine according to the present invention. FIG. 2 is a detailed view of the cylinder of FIG. 1.

  The present invention relates to a combustion engine, that is, a spark ignition gas engine. The spark ignition gas engine is preferably a large gas engine, and a relatively lean fuel mixture consisting of gaseous fuel and air is contained in the large gas engine. Will be burned.

  The combustion engine has at least one cylinder 10, and FIG. 1 schematically shows a cross section of the cylinder 10. The cylinder 10 includes a combustion chamber 11 for combusting a fuel mixture, the combustion chamber 11 being provided by a piston 12 of the cylinder 10 supported for stroke movement on a first side and a second side opposite thereto. Is limited by the flame deck 13 of the cylinder 10.

  The piston 12 is accommodated in the housing 14 of the cylinder 10 so as to make a stroke movement.

  FIG. 2 is a plan view of the flame deck 13, in the preferred embodiment of the invention shown, in the flame deck 13, two inlet valves 15, 16 for the fuel mixture to be ignited and burned, and for the exhaust gas. The two outlet valves 17 and 18 are attached.

  The surface provided to the flame deck 13 to accommodate the valves 15, 16, 17 and 18 is divided into four quadrants by a virtual separation line 19, one valve 15, 16 in each quadrant. , 17 or 18 are arranged.

  Respective outlet valves and inlet valves, ie, in FIG. 2, inlet valve 15 and outlet valve 18, and inlet valve 16 and outlet valve 17 extend through the midpoints of respective valves 15 and 18, or 16 and 17, respectively. Are arranged along the axis 20.

  According to the present invention, a plurality of ignition devices 21 distributed on the flame deck 13 of each cylinder 10 of the combustion engine are arranged for directly igniting the fuel mixture in the combustion chamber 11 of each cylinder 10. ing.

  These ignition devices 21 are, inter alia, electrical and / or optical ignition devices, which perform electric spark ignition, corona discharge ignition or laser ignition, combustion of the respective cylinder 10. Used to ignite the fuel mixture directly in the chamber 11.

  According to an advantageous refinement of the invention, the ignition device 21 is arranged along the quadrant separation line 19 of the flame deck 13. FIG. 2 shows by way of example a possible arrangement for the ignition device 21.

  Additionally or alternatively, a plurality of igniters 21 can be arranged along an axis 20 that extends through the midpoint of the valves 15, 18 and 16, 17. Again, FIG. 2 shows possible positions for the ignition device 21.

  Preferably, the plurality of ignition devices 21 are distributed on the flame deck 13 in a rotationally symmetrical manner with respect to the stroke axis of the piston 12.

  In order to directly ignite a relatively lean fuel mixture composed of gaseous fuel and air in the combustion chambers 11 of the respective cylinders 10, the plurality of ignition devices 21 are ignited simultaneously and / or shifted in time from each other. can do.

  According to the present invention, in a large gas engine, that is, a spark ignition gas engine, a relatively lean fuel mixture can be directly ignited reliably and reliably in the combustion chamber 11 of each cylinder 10. Therefore, the precombustion chamber for igniting the fuel mixture can be omitted.

DESCRIPTION OF SYMBOLS 10 Cylinder 11 Combustion chamber 12 Stroke piston 13 Flame deck 14 Cylinder housing 15 Inlet valve 16 Inlet valve 17 Outlet valve 18 Outlet valve 19 Separation line 20 Axis 21 Ignition device

Claims (5)

A combustion engine for burning a relatively lean fuel mixture consisting of gaseous fuel and air, i.e. a spark ignition gas engine, comprising at least one cylinder (10), said cylinder (10) or each A cylinder (10) defines a combustion chamber (11), which is limited on one side by a cylinder piston (12), which is supported for stroke movement and on the opposite side by a flame deck (13). In the flame deck (13), at least one inlet valve (15, 16) for a fuel mixture composed of gaseous fuel and air and at least one outlet valve (17, 18) for exhaust gas are provided. ) And the combustion engine to which
A plurality of ignition devices (21) are arranged on the flame deck (13), and the ignition devices directly ignite the fuel mixture in the combustion chambers (11) of the respective cylinders (10). Combustion engine characterized by being used for   In the flame deck (13), two inlet valves (15, 16) for a fuel mixture consisting of gaseous fuel and air and two outlet valves (17, 18) for exhaust gas are mounted. And each inlet valve (15, 16) and each outlet valve (17, 18) are arranged in one quadrant of the flame deck (13) restricted by a separation line (19). Combustion according to claim 1, characterized in that a plurality of the ignition devices (21) are arranged along the separation line (19) of the quadrant of the flame deck (13). organ.   In the flame deck (13), two inlet valves (15, 16) for a fuel mixture consisting of gaseous fuel and air and two outlet valves (17, 18) for exhaust gas are mounted. Each inlet valve and each outlet valve is disposed along an axis (20) extending through a midpoint of each valve, and the plurality of ignition devices (21) are connected to the axis ( 20. The combustion engine according to claim 1, wherein the combustion engine is disposed along 20).   The plurality of ignition devices (21) are distributed on the flame deck (13) in a rotationally symmetrical manner with respect to a stroke axis of the piston (12). The combustion engine according to one item.   The combustion engine according to any one of claims 1 to 4, wherein the plurality of ignition devices (21) can be controlled simultaneously and / or shifted in time.