Intake port multi-point injection spark ignition methanol engine and vehicle

Abstract

The application provides an intake passage multi-point injection spark ignition methanol engine and a vehicle, comprising: an EGR pipeline connected with an intake pipeline and an exhaust pipeline respectively, and the EGR pipeline is arranged on the bypass side of an engine body; the exhaust gas generated by the exhaust pipeline is recycled and supplied to a gas injection system through the EGR pipeline, so that the gas injection system performs multi-point gas injection; the gas injection system is also connected with a methanol supply source, which is used for providing methanol fuel to the gas injection system, and the gas injection system is connected with the engine body and sprays the methanol fuel to the engine body; the opening degree of the intake pipeline and the EGR pipeline is controlled to adjust the intake amount of the engine body, and the methanol injection amount of the gas injection system is controlled to make the spark ignition methanol engine equivalent combustion, lean combustion or rich combustion. The application can improve the combustion and working performance of the methanol engine, reduce the weight of the engine, make the structure of the engine more compact, and improve the power-weight ratio and the power-volume ratio of the engine.

Description

Technical Field

[0001] This application belongs to the field of engine technology, and in particular relates to an intake manifold multi-point injection spark-ignition methanol engine and vehicle. Background Technology

[0002] With the implementation of the national dual-carbon strategy, engines, as one of the main sources of carbon emissions, are gradually using low-carbon fuels to reduce carbon emissions. Among them, methanol, as a green and low-carbon fuel, is gradually becoming one of the alternative fuels.

[0003] However, due to the high latent heat of vaporization and poor evaporation of methanol, intake manifold injection methanol spark-ignition engines suffer from problems such as uneven fuel-air mixing and excessive methanol accumulation in the intake manifold, preventing it from entering the cylinder for combustion. Currently, these problems can be alleviated by using intake air heating to increase methanol evaporation and air-fuel injection to improve methanol atomization. However, intake air heating can lead to insufficient intake air volume and incomplete methanol combustion, while air-fuel injection requires an additional air source, increasing engine size and weight and affecting vehicle assembly. Summary of the Invention

[0004] In view of this, this application aims to propose an intake manifold multi-point injection ignition methanol engine and vehicle to solve the problems of insufficient intake air volume and incomplete combustion of methanol.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows:

[0006] In a first aspect, this application provides an intake manifold multi-point injection spark-ignition methanol engine, comprising:

[0007] Engine block, intake manifold, exhaust manifold, EGR manifold, and air-fuel injection system;

[0008] The intake pipe is connected to the intake end of the engine body, the exhaust pipe is connected to the exhaust end of the engine body, the EGR pipe is connected to the intake pipe and the exhaust pipe respectively, and the EGR pipe is located on the bypass side of the engine body.

[0009] The exhaust gas generated by the exhaust pipe is recirculated through the EGR pipe and supplied to the air-clamping injection system so that the air-clamping injection system can perform multi-point air-clamping injection.

[0010] The gas-jet injection system is also connected to a methanol supply source for supplying methanol fuel to the gas-jet injection system, which is connected to the engine body and injects methanol fuel thereto.

[0011] In response to controlling the opening of the intake manifold and the EGR manifold, the intake air volume of the engine body is adjusted, and the methanol injection volume of the air-jet injection system is controlled, so that the spark-ignition methanol engine can achieve equivalent combustion, lean combustion, or rich combustion.

[0012] Furthermore, the intake pipeline includes an intake manifold, which is connected to the intake duct of the engine body via an intake manifold;

[0013] The intake manifold is equipped with a throttle valve for adjusting the intake volume of the pipeline.

[0014] Furthermore, the exhaust pipeline includes an exhaust manifold, which is connected to the exhaust passage of the engine body via an exhaust manifold;

[0015] The EGR pipeline is connected to the intake manifold and the exhaust manifold respectively, and an EGR cooler and an EGR valve are installed on the EGR pipeline.

[0016] Furthermore, the air-clamping injection system includes an exhaust gas rail, a methanol fuel rail, and an integrated air-clamping injection nozzle;

[0017] The number of air-jet integrated nozzles is multiple, and they are spaced apart on the intake manifold. The multiple air-jet integrated nozzles are respectively connected to the exhaust gas rail and the methanol fuel rail, and inject methanol fuel into the engine body.

[0018] Furthermore, the gas source for the air-jet integrated nozzle is located after the EGR valve, and an exhaust gas pressure stabilizing chamber is provided before the exhaust gas rail.

[0019] Furthermore, the exhaust gas pressure stabilizing chamber has a tapered structure and a regulating valve is provided at its outlet.

[0020] Secondly, based on the same inventive concept, this application also provides a vehicle including a multi-point injection spark-ignition methanol engine for the intake manifold as described in the first aspect.

[0021] Compared with the prior art, the multi-point injection spark-ignition methanol engine and vehicle described in this application have the following advantages:

[0022] The present application describes a multi-point injection ignition methanol engine and vehicle in the intake manifold. The methanol engine can make full use of the waste heat of the recirculated exhaust gas to pre-evaporate part of the methanol in the premixing chamber of the air-jet integrated nozzle, ensuring that the methanol is fully mixed with the intake air in the intake manifold, thereby improving the combustion and working performance of the methanol engine. At the same time, by using the exhaust gas as the air source for air-jet injection, the external gas tank is eliminated, the engine weight is reduced, the engine structure is more compact, and the engine power-to-weight ratio and power-to-volume ratio are improved. Attached Figure Description

[0023] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0024] Figure 1 This is a schematic diagram of the structure of a multi-point injection ignition methanol engine for the intake manifold, as described in an embodiment of this application.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1-Intake manifold; 2-Throttle valve; 3-Intake manifold; 4-Engine body; 5-Exhaust manifold; 6-Exhaust manifold; 7-EGR line; 8-EGR cooler; 9-EGR valve; 10-Exhaust gas pressure regulating chamber; 11-Exhaust gas rail; 12-Methanol fuel rail; 13-Integrated air-jet nozzle. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0028] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0029] Please see Figure 1 As shown, this embodiment provides an intake manifold multi-point injection spark-ignition methanol engine, including:

[0030] 4. Engine body, intake manifold, exhaust manifold, EGR manifold, and air-fuel injection system;

[0031] The intake pipe is connected to the intake end of the engine body 4, the exhaust pipe is connected to the exhaust end of the engine body 4, the EGR pipe 7 is connected to the intake pipe and the exhaust pipe respectively, and the EGR pipe 7 is located on the bypass side of the engine body 4.

[0032] The exhaust gas generated by the exhaust pipe is recirculated through the EGR pipe 7 and supplied to the air-jet injection system so that the air-jet injection system can perform multi-point air-jet injection.

[0033] The gas-jet injection system is also connected to a methanol supply source for supplying methanol fuel to the gas-jet injection system. The gas-jet injection system is connected to the engine body 4 and injects methanol fuel into it.

[0034] In response to controlling the opening of the intake manifold and the EGR manifold 7, the intake air volume of the engine body 4 is adjusted, and the methanol injection volume of the air-jet injection system is controlled, so that the spark-ignition methanol engine can achieve equivalent combustion, lean combustion, or rich combustion.

[0035] Specifically, in this embodiment, the methanol engine can utilize engine exhaust as a gas source for the air-jet injection system, or utilize the exhaust waste heat to pre-evaporate some methanol in the premixing chamber of the air-jet injection system.

[0036] By controlling the intake manifold and EGR manifold 7, the engine intake air volume is adjusted together, and the methanol injection volume is controlled by the air-clamping injection system. The three work together to achieve equivalence combustion, lean combustion or rich combustion in the spark-ignition methanol engine.

[0037] The multi-point injection ignition methanol engine described in this embodiment can fully utilize the waste heat of recirculated exhaust gas to pre-evaporate part of the methanol in the premixing chamber of the air-jet integrated nozzle 13, ensuring that the methanol is fully mixed with the intake air in the intake manifold 3, thereby improving the combustion and working performance of the methanol engine; at the same time, using exhaust gas as the air source for air-jet injection eliminates the need for an external gas tank, reduces engine weight, makes the engine structure more compact, and improves the engine's power-to-weight ratio and power-to-volume ratio.

[0038] In some embodiments, the intake pipeline includes an intake manifold 1, which is connected to the intake passage of the engine body 4 via an intake manifold 3.

[0039] The intake manifold 1 is equipped with a throttle valve 2 for adjusting the intake volume of the pipeline.

[0040] Specifically, in this embodiment, the front end of the intake manifold 1 can be equipped with components such as an intercooler and a compressor as needed, the rear end of the intake manifold 1 is connected to the intake passage of the engine body 4 through the intake manifold 3, and a throttle valve 2 is provided on the intake manifold 1 to adjust the intake volume of the intake pipeline.

[0041] In some embodiments, the exhaust pipeline includes an exhaust manifold 6, which is connected to the exhaust passage of the engine body 4 via an exhaust manifold 5.

[0042] The EGR pipeline 7 is connected to the intake manifold 1 and the exhaust manifold 6 respectively, and the EGR pipeline 7 is equipped with an EGR cooler 8 and an EGR valve 9.

[0043] Specifically, in this embodiment, exhaust manifold 6 can be equipped with exhaust aftertreatment equipment, turbine and other components as needed at its rear end. The exhaust manifold 6 is connected to the exhaust passage of engine body 4 through exhaust manifold 5. Part of the exhaust gas discharged through exhaust manifold 6 enters the exhaust aftertreatment equipment and the other part enters EGR pipeline 7 to recycle the exhaust gas.

[0044] The recirculated exhaust gas temperature is controlled by the EGR cooler 8, and the temperature is adjusted according to the temperature requirements of the intake system or the air jet source.

[0045] In some embodiments, the gas-jet injection system includes an exhaust gas rail 11, a methanol fuel rail 12, and a gas-jet injection integrated nozzle 13;

[0046] The number of the air-jet integrated nozzles 13 is multiple and they are arranged at intervals on the intake manifold 3. The multiple air-jet integrated nozzles 13 are respectively connected to the exhaust gas rail 11 and the methanol fuel rail 12, and inject methanol fuel into the engine body 4.

[0047] Specifically, in this embodiment, by setting multiple air-clamping injection integrated nozzles 13, methanol can be injected at multiple points in the engine intake manifold. The air source used by the air-clamping injection integrated nozzles 13 is recirculated exhaust gas, which not only eliminates the need for an external air source, but also utilizes the waste heat of the recirculated exhaust gas to evaporate methanol.

[0048] The intake air volume is regulated by the throttle valve 2 and EGR valve 9, and the methanol injection volume is controlled by the integrated nozzle 13. The three work together to achieve equivalent combustion, lean combustion or rich combustion in the spark-ignition methanol engine.

[0049] First, based on the large latent heat of vaporization of methanol fuel, the waste heat of recirculated exhaust gas is fully utilized to pre-evaporate part of the methanol in the premixing chamber of the air-jet integrated nozzle 13, ensuring that the methanol is fully mixed with the intake air in the intake manifold 3, thereby improving the combustion and working performance of the methanol engine.

[0050] Second, by using exhaust gas as the air source for jet injection, the external air tank is eliminated, the engine weight is reduced, the engine structure is made more compact, and the engine power-to-weight ratio and power-to-volume ratio are improved.

[0051] In some embodiments, the gas source for the air-jet integrated nozzle 13 is located after the EGR valve 9, and an exhaust gas pressure stabilizing chamber 10 is provided before the exhaust gas rail 11.

[0052] The exhaust gas pressure stabilizing chamber 10 has a tapered structure and a regulating valve is provided at its outlet.

[0053] Specifically, in this embodiment, the gas source for the air-clamped injection integrated nozzle 13 is located after the EGR valve 9, and an exhaust gas stabilizing chamber 10 for air-clamped injection is set before the exhaust gas rail 11 for air-clamped injection. The exhaust gas stabilizing chamber 10 has the functions of stabilizing exhaust gas, pressurizing, taking air from the air-clamped injection gas source, and adjusting the temperature of the air-clamped injection gas source.

[0054] The exhaust gas pressure stabilizing chamber 10 described in this embodiment has a tapered shape and a regulating valve is provided at its outlet.

[0055] Based on the same inventive concept, and corresponding to the methods of any of the above embodiments, the embodiments of this application also provide an intake manifold multi-point injection ignition methanol engine.

[0056] The apparatus described above is used to implement a corresponding intake multi-point injection spark-ignition methanol engine in any of the foregoing embodiments, and has the beneficial effects of the corresponding method embodiments, which will not be repeated here.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

[0058] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A multi-point injection spark-ignition methanol engine for the intake manifold, characterized in that, include: Engine body (4), intake manifold, exhaust manifold, EGR manifold (7) and air-fuel injection system; The intake pipe is connected to the intake end of the engine body (4), the exhaust pipe is connected to the exhaust end of the engine body (4), the EGR pipe (7) is connected to the intake pipe and the exhaust pipe respectively, and the EGR pipe (7) is located on the bypass side of the engine body (4). The exhaust gas generated by the exhaust pipe is recirculated through the EGR pipe (7) and supplied to the air-clamping injection system for multi-point air-clamping injection. The gas-jet injection system is also connected to a methanol supply source for supplying methanol fuel to the gas-jet injection system. The gas-jet injection system is connected to the engine body (4) and injects methanol fuel into it. In response to controlling the opening of the intake pipe and the EGR pipe (7), the intake volume of the engine body (4) is adjusted, and the methanol injection volume of the air-clamping injection system is controlled so that the spark-ignition methanol engine can achieve equivalent combustion, lean combustion or rich combustion. The gas-jet injection system includes an exhaust gas rail (11), a methanol oil rail (12), and a gas-jet injection integrated nozzle (13); The number of the air-jet integrated nozzles (13) is multiple and they are arranged at intervals on the intake manifold (3). The multiple air-jet integrated nozzles (13) are respectively connected to the exhaust gas rail (11) and the methanol fuel rail (12) and inject methanol fuel into the engine body (4). The air source for the air-jet integrated nozzle (13) is located after the EGR valve (9), and an exhaust gas pressure stabilizing chamber (10) is set in front of the exhaust gas rail (11).

2. The multi-point injection spark-ignition methanol engine with an intake manifold according to claim 1, characterized in that: The intake pipeline includes an intake manifold (1), which is connected to the intake passage of the engine body (4) via an intake manifold (3); The intake manifold (1) is equipped with a throttle valve (2) for adjusting the intake volume of the pipeline.

3. The multi-point injection spark-ignition methanol engine with an intake manifold according to claim 2, characterized in that: The exhaust pipeline includes an exhaust manifold (6), which is connected to the exhaust passage of the engine body (4) via an exhaust manifold (5); The EGR pipeline (7) is connected to the intake manifold (1) and the exhaust manifold (6) respectively. An EGR cooler (8) and an EGR valve (9) are provided on the EGR pipeline (7).

4. The multi-point injection spark-ignition methanol engine with an intake manifold according to claim 1, characterized in that: The exhaust gas pressure stabilizing chamber (10) has a tapered structure and a regulating valve is provided at its outlet.

5. A vehicle, characterized in that, Including a multi-point injection spark-ignition methanol engine with an intake manifold as described in any one of claims 1-4.

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