Methanol M100 spark-ignition type marine engine

Abstract

The invention relates to a methanol M100 spark-ignition type marine engine, and belongs to the technical field of engines. Comprising an engine body. The system further comprises a control system, an ignition system and a methanol supply system. The control system is responsible for operation control of the whole engine. The methanol supply system supplies methanol to the methanol rail, the methanol passes through the methanol rail and then is atomized in the intake manifolds of the cylinders, and combustible mixed gas is formed by the methanol and pressurized air and enters the cylinders. And after the mixed gas enters each cylinder, a sparking plug contained in the ignition system ignites the combustible mixed gas to do work. By optimizing key technologies such as a combustion system, a control system and a safety system, efficient, clean and safe operation of the methanol M100 spark-ignition engine is achieved.

Description

Technical Field

[0001] The present application belongs to the field of engine technology, and specifically relates to a methanol M100 spark-ignition marine engine. Background Art

[0002] With the transformation of the global energy structure and the increasing attention paid to environmental protection, green, energy-saving, environmental protection and emission reduction have become the key topics of ship power research, and finding clean and efficient alternative fuels has become a research hotspot for ship power systems. Methanol, as a renewable, low-carbon fuel, is considered to be one of the most promising ship fuels due to its good combustion performance and wide sources.

[0003] At present, the main application of methanol fuel engines for ships is the demonstration of methanol / diesel dual-fuel engines, and there is no precedent for the application of methanol M100 spark ignition engines. Methanol / diesel dual-fuel engines are ignited by diesel compression ignition, which has a low fuel substitution rate and poor economy. Spark ignition engines use spark plug ignition. At the same time, due to the basic characteristics of methanol fuel with low vapor pressure and high latent heat of vaporization, spark ignition engines also need to solve the problems of spark ignition methanol engines in cold start, combustion stability and emission control. Summary of the invention

[0004] The technical problem to be solved by the present application is: to overcome the deficiencies of the prior art and to provide a methanol M100 spark-ignition marine engine. The present application achieves efficient, clean and safe operation of the methanol M100 spark-ignition engine by optimizing key technologies such as the combustion system, control system and safety system.

[0005] The technical solution adopted by this application to solve the problems existing in the prior art is:

[0006] A methanol M100 spark-ignition marine engine comprises an engine body, a control system, an ignition system and a methanol supply system. The control system is responsible for the operation control of the entire engine.

[0007] The methanol supply system supplies methanol to the methanol rail. After passing through the methanol rail, the methanol is atomized in the intake manifold of each cylinder, and forms a combustible mixture with the pressurized air and enters each cylinder.

[0008] After the mixture enters each cylinder, the spark plug included in the ignition system ignites the combustible mixture to perform work.

[0009] Preferably, a methanol injection valve is provided inside the intake manifold of each cylinder, the methanol injection valve is connected to the methanol rail, and the methanol injection valve atomizes the methanol.

[0010] Preferably, the spark plug is controlled by an ignition module, and the ignition module is electrically connected to the control system and the oxygen sensor.

[0011] Preferably, the oxygen sensor is arranged in the exhaust pipe after the turbine.

[0012] Preferably, the control system includes an electronic control unit, an engine monitor, a sensor system and a wiring harness. The control system adopts a DC24V dual-circuit power supply, which can realize automatic switching without affecting the operation of the engine.

[0013] Preferably, the control system is equipped with an independent switching power supply dedicated to the electric control system, and the independent dual power supply paths of the control system are provided with short circuit and overload protection.

[0014] Preferably, an electronic throttle valve is installed in the intake manifold.

[0015] Preferably, the methanol injection valve receives electronic signals from an air temperature sensor and an air pressure sensor near the electronic throttle, and the control system controls the amount of methanol injection in the intake manifold according to various parameters.

[0016] Preferably, the control system adopts an oxygen sensor closed-loop control strategy and controls the opening of the electronic throttle through the ECU, thereby achieving precise control of the engine power and torque.

[0017] Preferably, the methanol supply system mainly includes a methanol fuel tank, a methanol delivery pump, a methanol daily tank, a methanol overflow tank, a methanol flow meter, a methanol pressure stabilizing tank, a methanol booster pump, a pressure limiting valve, a filter and a methanol valve unit.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] (1) Improve combustion efficiency: By optimizing the combustion chamber structure and ignition system, the fuel in the cylinder is fully mixed, the mixing of fuel and air is promoted, and the combustion rate and combustion efficiency are improved.

[0020] (2) Reduce pollutant emissions: Methanol M100 fuel itself produces fewer pollutants during combustion. Combined with an optimized combustion system and exhaust after-treatment system, it can further reduce the emission of harmful gases such as NOx and CO.

[0021] (3) Good economy: Methanol fuel is widely available, relatively cheap, and has high combustion efficiency, which helps reduce ship operating costs.

[0022] (4) Strong adaptability: The methanol M100 spark-ignition marine engine of the present invention is suitable for the power requirements of ships under various working conditions and has good application prospects and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present application is further described below in conjunction with the accompanying drawings and embodiments.

[0024] Figure 1 For this application, the schematic diagram of the methanol M100 spark-ignition marine engine is shown.

[0025] Figure 2 For this application, the control system schematic diagram of the methanol M100 spark-ignition marine engine is provided.

[0026] Figure 3 This is the schematic diagram of the methanol supply system in the methanol M100 spark-ignition marine engine of this application.

[0027] In the figure: 1-air filter, 2-turbocharger, 3-air cooler, 4-electronic throttle, 5-intake pipe, 6-methanol injection valve, 7-methanol supply system, 8-methanol rail, 9-intake pipe explosion-proof valve, 10-control system, 11-ignition module, 12-spark plug, 13-exhaust pipe, 14-oxygen sensor, 15-exhaust pipe explosion-proof valve. DETAILED DESCRIPTION

[0028] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect.

[0029] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present application.

[0030] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 an indirect connection 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 this application can be understood according to specific circumstances.

[0031] The following is a further detailed description of a methanol M100 spark-ignition marine engine of the present application in conjunction with the accompanying drawings, but it is not intended to limit the present application.

[0032] The present invention discloses a methanol M100 spark-ignition marine engine, which mainly comprises an engine body, a control system 10, an ignition system, a methanol supply system 7 and the like. The main working principle is as follows: the engine air enters the intake pipe 5 through the air filter 1, the turbocharger 2, the air cooler 3 and the electronic throttle 4.

[0033] Methanol M100 adopts manifold multi-point injection mode. Methanol fuel comes from methanol supply system 7, and after passing through methanol rail 8, it is sprayed and atomized in the intake manifold of each cylinder through methanol injection valve 6, and forms a combustible mixture with the pressurized air and enters each cylinder. Under the precise control of control system 10, oxygen sensor 14, and ignition module 11, spark plug 12 is used to ignite the combustible mixture to do work, and the engine exhaust is discharged through exhaust pipe 13. The end of exhaust pipe 13 is connected in series with DOC catalytic oxidizer and muffler. Intake pipe explosion-proof valve 9 and exhaust pipe explosion-proof valve 15 are used for engine safety protection. Oxygen sensor 14 is set on the exhaust pipe after turbine.

[0034] The control system is responsible for the operation control of the entire engine, including the electronic control unit, engine monitor, sensor system, wiring harness, etc. The whole system adopts DC24V dual-circuit power supply, which can realize automatic switching without affecting the operation of the engine, and is equipped with an independent switching power supply dedicated to the electronic control system (AC220V to DC24V). The independent dual power supply paths are equipped with short-circuit and overload protection, and visual and audible alarms are issued when the power fails.

[0035] In order to control the concentration of the combustible mixture entering the cylinder within the ignition limit, the intake manifold is equipped with an electronic throttle 4, which is a controllable valve that controls the air entering the engine and determines the operating conditions of the engine. The purpose is to control and regulate the intake volume of the engine. After the air enters the intake pipe, it mixes with the methanol fuel in the intake manifold to become a combustible mixed gas. The negative pressure formed by the air flow in the intake pipe sucks the mixed gas into the cylinder to participate in combustion and work. The methanol injection valve 6 is provided by the electronic signal provided by the air temperature sensor and the air pressure sensor near the electronic throttle 4, and the ECU of the control system controls the methanol injection volume in the intake manifold according to various parameters.

[0036] The closed-loop control strategy of oxygen sensor is adopted, and the throttle opening is controlled by the ECU of the control system, so as to achieve precise control of engine power and torque. The fuel injection system adjusts the methanol fuel injection start time and injection duration according to the engine load and speed, and accurately supplies and controls the full range of engine working conditions to maintain the stability of engine operation. The engine load and speed are sensed by the engine's camshaft phase sensor and crankshaft speed sensor.

[0037] The engine safety monitoring system is used to monitor the working status of the engine and take corresponding measures to protect the engine safety under abnormal conditions. By integrating advanced sensors and controllers, it can realize real-time monitoring and precise control of the engine status to ensure that the engine runs under the best working conditions.

[0038] In this embodiment, offshore intelligent real-time monitoring system technology is adopted to realize real-time monitoring of ship engine parameters. At the same time, through remote intelligent terminal equipment, marine engine operating information, fault information, location information and other data can be uploaded in real time, and the ship operation status can be remotely monitored in real time. After big data analysis by the power cloud platform, effective information is provided to the shipowner in a timely manner.

[0039] The ignition system includes an ignition module 11, a crankshaft speed sensor, a camshaft phase sensor, an input wiring harness, an output wiring harness, an ignition coil, a high-voltage wire, a spark plug, etc. The ignition system accurately controls the ignition timing and ignition energy according to the engine operating conditions to ensure that the mixed gas is ignited at the best time, optimize the combustion process, and improve the engine performance and combustion efficiency.

[0040] Depend on Figure 3 As shown, the methanol supply system 7 mainly includes a methanol fuel tank, a methanol delivery pump, a methanol daily tank, a methanol overflow tank, a methanol flowmeter, a methanol pressure stabilizing tank, a methanol pressure pump, a pressure limiting valve, a filter, a methanol valve unit MVU (FVT), etc. The methanol inside the methanol fuel tank is pumped into the methanol daily tank through the methanol delivery pump. The methanol fuel tank is connected to a methanol fuel adding pipeline and an inert gas adding pipeline. By adding inert gas to the remaining space inside the methanol fuel tank, the internal air is discharged to play a protective role.

[0041] An overflow pipe is provided above the methanol daily tank, and the overflow pipe is connected to the methanol overflow tank. The bottom of the methanol daily tank is connected to the methanol pressure stabilizing tank through a pipeline, and a methanol flowmeter is provided on the pipeline. The methanol booster pump and the pressure limiting valve are connected to the methanol pressure stabilizing tank through parallel pipelines, and the filter is provided on the common pipeline at the rear end of the methanol booster pump and the pressure limiting valve.

[0042] The methanol supply system is mainly used to stably and efficiently transport the methanol fuel in the methanol fuel tank to the methanol injection valve of each cylinder to supply the engine with combustion and work. Its main function is to maintain stable methanol pressure, methanol atomization and timed and quantitative injection. The ECU controls the methanol injection amount through the injection pulse width of the methanol injection valve of each cylinder.

[0043] The implementation methods of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above implementation methods, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present application.

Claims

1. A methanol M100 spark-ignition marine engine, comprising an engine body, characterized in that: It also includes a control system, an ignition system and a methanol supply system (7); The control system is responsible for the operation control of the entire engine; The methanol supply system (7) supplies methanol to the methanol rail (8), and the methanol is atomized in the intake manifold of each cylinder after passing through the methanol rail (8), and forms a combustible mixed gas with the pressurized air and enters each cylinder; After the mixed gas enters each cylinder, the spark plug (12) included in the ignition system ignites the combustible mixed gas to perform work.

2. A methanol M100 spark ignition marine engine according to claim 1, characterized in that: A methanol injection valve (6) is arranged inside the intake manifold of each cylinder. The methanol injection valve (6) is connected to a methanol rail (8). The methanol injection valve (6) atomizes methanol.

3. A methanol M100 spark ignition marine engine according to claim 1, characterized in that: The spark plug (12) is controlled by an ignition module (11), and the ignition module (11) is electrically connected to a control system (10) and an oxygen sensor (14).

4. A methanol M100 spark ignition marine engine according to claim 3, characterized in that: The oxygen sensor (14) is arranged in the exhaust pipe after the turbine.

5. A methanol M100 spark ignition marine engine according to any one of claims 1 to 4, characterized in that: The control system includes an electronic control unit, an engine monitor, a sensor system and a wiring harness. The control system adopts a DC24V dual-circuit power supply, which can realize automatic switching without affecting the operation of the engine.

6. A methanol M100 spark ignition marine engine according to claim 5, characterized in that: The control system is equipped with an independent switching power supply dedicated to the electric control system, and the independent dual power supply paths of the control system are provided with short circuit and overload protection.

7. A methanol M100 spark ignition marine engine according to claim 4, characterized in that: The intake manifold is equipped with an electronic throttle valve (4).

8. A methanol M100 spark ignition marine engine according to claim 7, characterized in that: The methanol injection valve (6) uses electronic signals provided by an air flow sensor and an air pressure sensor near the electronic throttle valve (4) to control the methanol injection amount in the intake manifold according to various parameters.

9. A methanol M100 spark ignition marine engine according to claim 8, characterized in that: The control system adopts an oxygen sensor closed-loop control strategy and controls the opening of an electronic throttle valve (4) through an ECU, thereby achieving precise control of engine power and torque.

10. A methanol M100 spark ignition marine engine according to any one of claims 6 to 9, characterized in that: The methanol supply system (7) mainly comprises a methanol fuel tank, a methanol delivery pump, a methanol daily tank, a methanol overflow tank, a methanol flow meter, a methanol pressure stabilizing tank, a methanol booster pump, a pressure limiting valve, a filter and a methanol valve unit.

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