Method for synchronous ignition, rapid and stable combustion of double spark plugs of opposed piston engine

Abstract

The invention provides a double-spark-plug synchronous ignition rapid and stable combustion method for an opposed piston engine. A double-spark-plug synchronous ignition rapid and stable combustion system comprises a cylinder sleeve, an upper piston, a first spark plug, an oil sprayer, a second spark plug and a lower piston. The sparking plug has the beneficial effects that the problems of unstable ignition, low flame propagation speed and the like caused by single-side arrangement of the sparking plug are solved, fresh charge enters the combustion chamber through the inclined air port and forms vortex in the combustion chamber, fuel oil beams sprayed out of the oil sprayer are mixed with the fresh charge in the combustion chamber under the action of the vortex to form a combustible mixture, and the combustion effect is improved. The initial fire core formed by the first sparking plug moves towards the second sparking plug under the action of the vortex, the initial fire core formed by the second sparking plug moves towards the first sparking plug under the action of the vortex, the flame propagation distance is shortened, the knocking tendency is weakened, and the combustion stability is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of internal combustion engine structure design, and in particular relates to a method for rapid and stable combustion of dual spark plug synchronous ignition of an opposed piston engine. Background Art

[0002] At present, four-stroke engines are commonly used in the field of vehicle and ship power. Four-stroke engines are large in size, complex in structure, low in power-to-weight ratio, and poor in compactness. The opposed-piston two-stroke engine eliminates the cylinder head and valve structure, and the opposed pistons are arranged in the same cylinder, which greatly improves the compactness and power-to-weight ratio. The opposed-piston engine eliminates the traditional cylinder head structure, and the combustion chamber is composed of the top surface of the opposed pistons. The injector and the spark plug are arranged on the cylinder wall. This arrangement increases the flame propagation distance and is more demanding on the formation of the oil-gas mixture and the propagation of the flame. In order to further improve the compactness and power-to-weight ratio of the engine, the injector and the spark plug can be arranged on the same side of the cylinder wall, resulting in most of the fuel sprayed by the injector on the opposite side of the spark plug. When ignited, the oil-gas mixture near the spark plug is thinner and the outer layer of the oil-gas mixture is thicker, which leads to problems such as unstable ignition and slow flame propagation. Summary of the invention

[0003] In view of this, the present invention aims to provide a method for rapid and stable combustion of dual spark plugs synchronously ignited in an opposed-piston engine, so as to solve at least one problem existing in the above-mentioned prior art.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0005] A method for rapid and stable combustion of dual spark plug synchronous ignition of an opposed piston engine is implemented by a dual spark plug synchronous ignition rapid and stable combustion system, the dual spark plug synchronous ignition rapid and stable combustion system comprising a cylinder liner, an upper piston, a first spark plug, an injector, a second spark plug and a lower piston, the upper piston and the lower piston are installed inside the cylinder liner, the first spark plug, the injector and the second spark plug are respectively installed on one side of the cylinder liner in sequence, and the first spark plug, the injector and the second spark plug are all located on the center plane of the cylinder liner, the center line of the first spark plug forms an angle α with the center line of the injector, the center line of the second spark plug forms an angle β with the center line of the injector, and a plurality of gas ports are provided on both sides of the cylinder liner;

[0006] Combustion methods include:

[0007] The fresh charge enters the combustion chamber through the inclined air port and forms a vortex in the combustion chamber;

[0008] The fuel jet sprayed by the injector forms a combustible mixture with the fresh charge in the combustion chamber under the action of vortex;

[0009] The first initial fire core formed by the first spark plug moves toward the second spark plug under the action of the eddy current, and the second initial fire core formed by the second spark plug moves toward the first spark plug under the action of the eddy current.

[0010] Furthermore, the angle α between the center line of the first spark plug and the center line of the injector is in the range of 60°-120°.

[0011] Furthermore, the included angle β between the center line of the second spark plug and the center line of the injector is in the range of 60°-120°.

[0012] Furthermore, the diameter range of the upper piston and the lower piston is 40mm-100mm.

[0013] Furthermore, the inclination angle range of all the air ports is 5°-35°, the inclination directions of the air ports are consistent, and the directions of the vortices near the air ports are consistent.

[0014] Furthermore, the first spark plug and the second spark plug have the same ignition timing and ignition energy.

[0015] Compared with the prior art, the method for rapid and stable combustion of dual spark plugs synchronously ignited in an opposed piston engine according to the present invention has the following advantages:

[0016] The method for rapid and stable combustion of dual spark plugs synchronously ignited by an opposed piston engine described in the present invention improves the problems of unstable ignition and slow flame propagation speed caused by the one-sided arrangement of the spark plugs. The fresh charge enters the combustion chamber through the inclined air port and forms a vortex in the combustion chamber. The fuel beam sprayed by the injector is mixed with the fresh charge in the combustion chamber under the action of the vortex to form a combustible mixture. The initial fire core formed by the first spark plug moves toward the second spark plug under the action of the vortex, and the initial fire core formed by the second spark plug moves toward the first spark plug under the action of the vortex. The flame propagation distance is shortened, the knock tendency is weakened, and the combustion stability is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 A schematic diagram of a dual spark plug synchronous ignition rapid and stable combustion system according to an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the principle of rapid and stable combustion of dual spark plug synchronous ignition according to an embodiment of the present invention.

[0020] Description of reference numerals:

[0021] 1. Cylinder liner; 2. Upper piston; 3. First spark plug; 4. Fuel injector; 5. Second spark plug; 6. Lower piston; 7. Air port. DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0025] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0026] like Figure 1 to Figure 2As shown, a method for rapid and stable combustion of dual spark plug synchronous ignition of an opposed piston engine comprises a cylinder liner 1, an upper piston 2, a first spark plug 3, an injector 4, a second spark plug 5, a lower piston 6, and an air port 7. The upper piston 2 and the lower piston 6 are installed inside the cylinder liner 1, and the first spark plug 3, the injector 4 and the second spark plug 5 are fixedly installed on the cylinder liner 1. The first spark plug 3, the injector 4 and the second spark plug 5 are all located on the center plane of the cylinder liner 1. The injector is located between the first spark plug and the second spark plug, and the center line of the first spark plug 3 forms an angle α with the center line of the injector 4, and the center line of the second spark plug 5 forms an angle β with the center line of the injector 4. The range of the angle α between the center line of the first spark plug 3 and the center line of the injector 4 is 60°-120°, and the range of the angle β between the center line of the second spark plug 5 and the center line of the injector 4 is 60°-120°. The diameter range of the upper piston 2 and the lower piston 6 is 40mm-100mm. The fresh charge enters the combustion chamber through the inclined air port 7 and forms a vortex in the combustion chamber. The inclination angle range of all air ports 7 is 5°-35°, the inclination direction of the air ports 7 is consistent, and the vortex direction near the air ports 7 is consistent. The ignition time and ignition energy of the first spark plug 3 and the second spark plug 5 are the same. The fuel beam sprayed by the injector 4 forms a combustible mixture with the fresh charge in the combustion chamber under the action of the vortex. The first initial fire core formed by the first spark plug 3 moves toward the second spark plug 5 under the action of the vortex, and the second initial fire core formed by the second spark plug 5 moves toward the first spark plug 3 under the action of the vortex, which shortens the flame propagation distance, weakens the knock tendency, and improves the combustion stability.

[0027] The present invention improves the problems of unstable ignition and slow flame propagation speed caused by the unilateral arrangement of the spark plug. The fresh charge enters the combustion chamber through the inclined air port 7 and forms a vortex in the combustion chamber. The fuel beam sprayed by the injector 4 is mixed with the fresh charge in the combustion chamber under the action of the vortex to form a combustible mixture. The first initial fire core formed by the first spark plug 3 moves toward the second spark plug 5 under the action of the vortex, and the second initial fire core formed by the second spark plug 5 moves toward the first spark plug 3 under the action of the vortex. The flame propagation distance is shortened, the knock tendency is improved, and the combustion stability is improved.

[0028] The working principle of a method for synchronous ignition and rapid and stable combustion of dual spark plugs in an opposed piston engine is as follows:

[0029] like Figure 2 As shown, the fresh charge enters the combustion chamber through the inclined air port 7 and forms a vortex in the combustion chamber. The fuel beam sprayed by the injector 4 is mixed with the fresh charge in the combustion chamber under the action of the vortex to form a combustible mixture. The first initial fire core formed by the first spark plug 3 moves toward the second spark plug 5 under the action of the vortex, and the second initial fire core formed by the second spark plug 5 moves toward the first spark plug 3 under the action of the vortex. The flame propagation distance is shortened, the knock tendency is weakened, and the combustion stability is improved.

[0030] Example 1

[0031] The diameter of the upper piston 2 and the lower piston 6 are both 65 mm. The cylinder liner 1 is fixed with the first spark plug 3, the injector 4 and the second spark plug 5. The first spark plug 3, the injector 4 and the second spark plug 5 are all located on the center plane of the cylinder liner 1. The injector is located between the first spark plug and the second spark plug. The angle between the center line of the first spark plug 3 and the center line of the injector 4 is 90°, and the angle between the center line of the second spark plug 5 and the center line of the injector 4 is 90°. The inclination angle of all gas ports is 10°, the inclination direction is clockwise, and the vortex direction near the gas port is clockwise. The fresh charge enters the combustion chamber through the inclined gas port 7 and forms a vortex in the combustion chamber. The fuel beam sprayed by the injector 4 forms a combustible mixture with the fresh charge in the combustion chamber under the action of the vortex. The first initial fire core formed by the first spark plug 3 moves toward the second spark plug 5 under the action of the clockwise vortex, and the second initial fire core formed by the second spark plug 5 moves toward the first spark plug 3 under the action of the clockwise vortex, thereby shortening the flame propagation distance, weakening the knock tendency, and improving the combustion stability.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for rapid and stable combustion of dual spark plugs synchronously ignited in an opposed piston engine, characterized in that: The invention is realized by a dual spark plug synchronous ignition rapid and stable combustion system, which comprises a cylinder liner (1), an upper piston (2), a first spark plug (3), an injector (4), a second spark plug (5) and a lower piston (6); the upper piston (2) and the lower piston (6) are installed inside the cylinder liner (1); the first spark plug (3), the injector (4) and the second spark plug (5) are installed in sequence on one side of the cylinder liner (1); the first spark plug (3), the injector (4) and the second spark plug (5) are all located on the center plane of the cylinder liner (1); the center line of the first spark plug (3) and the center line of the injector (4) form an angle α; the center line of the second spark plug (5) and the center line of the injector (4) form an angle β; and a plurality of gas ports (7) are provided on both sides of the cylinder liner (1); Combustion methods include: The fresh charge enters the combustion chamber through the inclined air port (7) and forms a vortex in the combustion chamber; The fuel beam sprayed by the fuel injector (4) forms a combustible mixed gas with the fresh charge in the combustion chamber under the action of the vortex; A first initial fire core formed by the first spark plug (3) moves toward the second spark plug (5) under the action of the eddy current, and a second initial fire core formed by the second spark plug (5) moves toward the first spark plug (3) under the action of the eddy current.

2. The method for rapid and stable combustion of dual spark plugs synchronously ignited by an opposed piston engine according to claim 1, characterized in that: The included angle α between the center line of the first spark plug (3) and the center line of the fuel injector (4) is in the range of 60°-120°.

3. The method for rapid and stable combustion of dual spark plugs synchronously ignited by an opposed piston engine according to claim 1, characterized in that: The included angle β between the center line of the second spark plug (5) and the center line of the fuel injector (4) is in the range of 60°-120°.

4. The method for rapid and stable combustion of dual spark plugs synchronously ignited by an opposed piston engine according to claim 1, characterized in that: The diameters of the upper piston (2) and the lower piston (6) are both in the range of 40 mm to 100 mm.

5. The method for rapid and stable combustion of dual spark plugs synchronously ignited by an opposed piston engine according to claim 1, characterized in that: The inclination angles of all the air ports (7) are in the range of 5°-35°, the inclination directions of the air ports (7) are consistent, and the directions of the vortices near the air ports (7) are consistent.

6. The method for rapid and stable combustion of dual spark plugs synchronously ignited by an opposed piston engine according to claim 1, characterized in that: The first spark plug (3) and the second spark plug (5) have the same ignition timing and ignition energy.

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