Air intake system

Abstract

The invention discloses an air inlet system. The air inlet system comprises an air inlet main pipe, an air outlet main pipe and an air outlet main pipe, one end of the air inlet manifold is connected with the bottom of the air inlet main pipe and communicated with the main pipe cavity, and the other end of the air inlet manifold faces one side of the air inlet main pipe; the enclosure cavity is arranged on the other side of the air inlet main pipe; the common rail pipe is arranged in the enclosure cavity; the combustion substance inlet pipeline is arranged on the gas inlet main pipe; the common rail pipe is communicated with the inlet pipeline through a common rail electronic control valve; the backflow pipeline is arranged on the air inlet main pipe and is communicated with the enclosure cavity; the common rail pipe is communicated with a fuel substance backflow pipeline through an overflow valve; the manifold electronic control valves are arranged between the common rail pipe and the injectors, and each injector is used for injecting combustion substances into the intake manifold; therefore, the combustion substance is injected into the intake manifold according to the requirement and then enters the combustion chamber after being mixed with the air, and the problem that the requirement for an injection system is high due to the corrosivity of the combustion substance is solved.

Description

Technical Field

[0001] The invention relates to engine design and manufacture, in particular to an air intake system of a methanol engine. Background Art

[0002] An engine that uses methanol as its main fuel is called a methanol fuel engine.

[0003] The advantages of using methanol as an alternative fuel for engines include:

[0004] 1) The changes to the original engine are relatively minor. On the basis of meeting the power performance of the original engine, its economy and emissions can be greatly improved;

[0005] 2) It has less environmental pollution to the atmosphere and is a clean alternative fuel for vehicle engines;

[0006] 3) Methanol fuel is a liquid fuel. We can use the storage and transportation system of petroleum fuel in its storage and transportation process, so the infrastructure investment is relatively small.

[0007] The main disadvantages of methanol fuel as an alternative fuel for vehicle engines include:

[0008] 1) Methanol fuel itself is toxic. For example, if you drink 5 to 10 ml by mistake, you will go blind. Drinking a large amount of it will cause death.

[0009] 2) The flame of methanol fuel is colorless and therefore difficult to detect;

[0010] 3) The exhaust of engines using methanol as fuel will contain harmful gas emissions such as unburned alcohols and formaldehyde (HCHO).

[0011] Although there are some difficulties in directly applying methanol fuel to engines, we can still achieve it by using certain technologies and methods. Many successful technologies and methods have been produced at home and abroad, and these methods are worth learning from. The technical routes used when engines use methanol fuel are briefly summarized as follows:

[0012] 1) Folding mixed combustion: When methanol fuel is used in compression ignition engines, an alcohol supply system (providing methanol fuel) and an alcohol injection system (injecting methanol fuel) can be added to the original engine's power system to achieve mixed combustion of the mixture in the engine cylinder. When we use this method of mixed combustion of methanol fuel and diesel fuel, we do not need to make major changes to the original engine to obtain relatively satisfactory results. However, when the engine adopts this mixed combustion method, the replacement rate of methanol fuel is generally low. A high replacement rate of methanol fuel will cause the engine's cold start performance to deteriorate and produce rough operation. In actual application, the replacement rate of methanol fuel should generally be kept within 30%.

[0013] 2) Folding injection system method: When using the dual fuel injection system method, the engine to be replaced must have two independent fuel injection pumps and injector systems, one of which is used to inject diesel fuel and the other is used to inject methanol fuel, so as to ensure that the methanol fuel can be mixed and atomized and burned in the cylinder. This method has relatively low requirements on the properties of methanol fuel itself, and the replacement rate of methanol fuel is relatively high. Its disadvantage is that this method requires relatively large changes to the original engine and the cost of the change is relatively high. This method is generally used on engines with relatively large cylinder diameters. In addition, when using this method, the performance of the engine will be mainly affected by the injection angle, injection timing and amount of the pilot fuel jet.

[0014] At present, the intake mode of methanol engine usually adopts the in-cylinder injection mode, which is directly injected into the combustion chamber for ignition. Due to the corrosiveness of methanol, the injection system has high requirements and the reliability of the injection system is not high, which in turn affects the reliability of the whole machine.

[0015] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0016] The purpose of the present invention is to provide an intake system, which first injects the combustion material into the intake manifold as required to mix with the air before entering the combustion chamber, thereby overcoming the problem of high requirements on the injection system due to the corrosiveness of the combustion material, and also solving the problem of low reliability of the injection system, which in turn affects the reliability of the entire machine.

[0017] To achieve the above-mentioned purpose, the present invention provides an intake system, including an intake main pipe, an intake manifold, an enclosure cavity, a common rail pipe, a combustion material inlet pipe, a common rail electronic control valve, a fuel material return pipe, a relief valve and a manifold electronic control valve; the intake main pipe includes a main pipe cavity inside, and the intake main pipe is used to provide air for combustion to the engine; one end of a plurality of intake manifolds is connected to the bottom of the intake main pipe and communicated with the main pipe cavity, and the other end of the intake manifold faces one side of the intake main pipe and is communicated with the combustion chamber at the same time; the enclosure cavity is arranged on the other side of the intake main pipe ; The common rail pipe is arranged in the enclosed cavity; the combustion material inlet pipe is arranged on the intake manifold and is connected with the enclosed cavity; the common rail pipe is connected with the combustion material inlet pipe through a common rail electronic control valve; the fuel material return pipe is arranged on the intake manifold and is connected with the enclosed cavity; the common rail pipe is connected with the fuel material return pipe through an overflow valve; a plurality of manifold electronic control valves are arranged between the common rail pipe and the injector, and each injector is used to inject the combustion material into the intake manifold; wherein the common rail electronic control valve, the overflow valve and the manifold electronic control valve are all connected with the ECU electrical data.

[0018] In a preferred embodiment, the air intake system also includes a scavenging air inlet and a scavenging air outlet; the scavenging air inlet is arranged at one end of the enclosed cavity; the scavenging air outlet is arranged at the other end of the enclosed cavity; wherein the scavenging gas can enter the enclosed cavity from the scavenging air inlet, purge the combustion material gas in the enclosed cavity, and be discharged from the scavenging air outlet.

[0019] In a preferred embodiment, the air intake system further includes a detection sensor, which is disposed in the enclosed cavity and is used to detect the concentration of the combustion substance gas in the enclosed cavity.

[0020] In a preferred embodiment, the detection sensor is electrically connected to the ECU, and the ECU can control the purge pump in real time to pass the purge gas into the purge inlet for purge and then discharge it from the purge outlet based on the concentration of the combustion material gas in the enclosed chamber monitored by the detection sensor.

[0021] In a preferred embodiment, the intake system also includes an electronic throttle, an intake pipe and a heater connected in sequence. The heater is arranged at one end of the intake manifold and connected to the manifold cavity. Fresh air passes through the electronic throttle, the intake pipe and the heater in sequence and enters the manifold cavity.

[0022] In a preferred embodiment, the electronic throttle valve, the intake pipe, the heater, the intake manifold, the manifold cavity and the intake manifold form an air flow path.

[0023] In a preferred embodiment, the combustion material inlet pipe, the common rail electronic control valve, the common rail pipe, the manifold electronic control valve, the injector, the overflow valve and the fuel material return pipe form a combustion material flow path.

[0024] In a preferred embodiment, the purge gas inlet, the purge pump and the purge outlet form a gas purge flow path.

[0025] In a preferred embodiment, the air intake system also includes a shielding cover plate and a leakage collection pipe; the shielding cover plate is arranged on a portion of the outer wall on the other side of the air intake manifold, and the shielding cover plate and a portion of the outer wall on the other side of the air intake manifold form a closed enclosed cavity; the leakage collection pipe is connected to the bottom of the enclosed cavity, and the leakage collection pipe is used to collect and discharge the combustion materials leaked into the enclosed cavity.

[0026] In a preferred embodiment, the air intake system further includes an explosion-proof valve, which is disposed on the air intake manifold and communicated with the enclosed cavity, and is used to prevent the air intake manifold from bursting due to backfire in the air intake manifold.

[0027] Compared with the prior art, the intake system of the present invention has the following beneficial effects: first, the intake pipe methanol injection system is enclosed and protected, and even if there is leakage of methanol liquid, the methanol liquid and gas can be led back to the collector through the set pipeline; the methanol solution is first sprayed on the intake manifold and pre-mixed with fresh air before entering the combustion chamber. The intake pipe is equipped with an explosion-proof valve, which can effectively protect the intake system from bursting due to backfire; the enclosed cavity has a real-time purge function, which overcomes the problem of high requirements for the injection system due to the corrosiveness of the combustion material, and also solves the problem of low reliability of the injection system, which in turn affects the reliability of the whole machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic diagram of the three-dimensional structure of an intake system according to an embodiment of the present invention;

[0029] Figure 2 is a schematic cross-sectional structural diagram of an intake manifold of an intake system according to an embodiment of the present invention;

[0030] Figure 3 is a schematic diagram of a top view of a common rail assembly according to an embodiment of the present invention;

[0031] Figure 4 is a schematic diagram of a top view of an air intake system according to an embodiment of the present invention;

[0032] Figure 5 is a schematic diagram of a three-dimensional structure of an air intake system according to an embodiment of the present invention from another perspective;

[0033] Figure 6 is a schematic diagram of a three-dimensional structure of an enclosed cavity according to an embodiment of the present invention;

[0034] Figure 7 is a schematic diagram of a three-dimensional structure of an air intake system according to an embodiment of the present invention from another perspective;

[0035] Figure 8 is a partial cross-sectional structural schematic diagram of an intake system according to an embodiment of the present invention;

[0036] Fig. 9 is a schematic diagram of the three-dimensional structure of the air intake system according to one embodiment of the present invention from another perspective;

[0037] Fig.10 It is a schematic diagram of a three-dimensional cross-sectional structure of a fuel material return pipe according to an embodiment of the present invention.

[0038] Description of main reference numerals:

[0039] 1-electronic throttle, 2-intake pipe, 3-heater, 4-intake main pipe, 5-explosion-proof valve, 6-fuel material return pipe, 7-combustion material inlet pipe, 8-leakage collection pipe, 9-enclosing cover, 10-manifold electronic control valve, 11-common rail pipe, 12-overflow valve, 13-common rail electronic control valve, 14-enclosing chamber, 15-scavenging inlet, 16-detection sensor, 17-scavenging outlet, 18-main pipe cavity, 19-intake manifold. DETAILED DESCRIPTION

[0040] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0041] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0042] like Figures 1 to 4As shown, an intake system according to a preferred embodiment of the present invention includes an intake manifold 4, an intake manifold 19, an enclosure chamber 14, a common rail pipe 11, a combustion material inlet pipe 7, a common rail electronic control valve 13, a fuel material return pipe 6, a relief valve 12 and a manifold electronic control valve 10; the intake manifold 4 includes a manifold chamber 18, and the intake manifold 4 is used to provide air for combustion to the engine. Fresh air can enter multiple intake manifolds 19 through the manifold chamber 18; one end of the multiple intake manifolds 19 is connected to the bottom of the intake manifold 4 and communicated with the manifold chamber 18, and the other end of the intake manifold 19 faces one side of the intake manifold 4 and is communicated with the combustion chamber at the same time; the enclosure chamber 14 is arranged on the other side of the intake manifold 4; The rail pipe 11 is arranged in the enclosed cavity 14; the combustion material inlet pipeline 7 is arranged on the intake manifold 4 and is connected to the enclosed cavity 14; the common rail pipe 11 is connected to the combustion material inlet pipeline 7 through the common rail electronic control valve 13; the fuel material return pipeline 6 is arranged on the intake manifold 4 and is connected to the enclosed cavity 14; the common rail pipe 11 is connected to the fuel material return pipeline 6 through the overflow valve 12; a plurality of manifold electronic control valves 10 are arranged between the common rail pipe 11 and the injector, each injector is used to inject combustion material into the intake manifold 19, and in principle, the number of manifold electronic control valves 10 matches the number of intake manifolds 19; wherein the common rail electronic control valve 13, the overflow valve 12 and the manifold electronic control valve 10 are all connected to the ECU electrical data.

[0043] In some implementations, the fuel material used in this embodiment is methanol, which has high corrosiveness and generally has high requirements for the injection system.

[0044] In some embodiments, the air intake system further includes a scavenging air inlet 15 and a scavenging air outlet 17; the scavenging air inlet 15 is disposed at one end of the enclosed cavity 14; the scavenging air outlet 17 is disposed at the other end of the enclosed cavity 14; wherein the purge gas can enter the enclosed cavity 14 from the scavenging air inlet 15, purge the combustion material gas in the enclosed cavity 14, and be discharged from the scavenging air outlet 17. The purge gas in this embodiment can be fresh air or nitrogen.

[0045] In some embodiments, the air intake system further includes a detection sensor 16 , which is disposed in the enclosed cavity 14 and is used to detect the concentration of the combustion substance gas in the enclosed cavity 14 .

[0046] In some embodiments, the detection sensor 16 is electrically connected to the ECU. The ECU can monitor the concentration of the combustion material gas in the enclosed cavity 14 through the detection sensor 16, and control the purge pump in real time to pass the purge gas into the purge inlet 15 for purge and then discharge it from the purge outlet 17.

[0047] In some embodiments, the intake system also includes an electronic throttle valve 1, an intake pipe 2, and a heater 3 that are connected in sequence. The heater 3 is arranged at one end of the intake manifold 4 and is connected to the manifold cavity 18. Fresh air passes through the electronic throttle valve 1, the intake pipe 2, and the heater 3 in sequence and then enters the manifold cavity 18.

[0048] In some embodiments, the electronic throttle valve 1 , the intake pipe 2 , the heater 3 , the intake manifold 4 , the manifold cavity 18 , and the intake manifold 19 form an air flow path.

[0049] In some embodiments, the combustion material inlet pipe 7 , the common rail electronic control valve 13 , the common rail pipe 11 , the manifold electronic control valve 10 , the injector, the overflow valve 12 , and the fuel material return pipe 6 form a combustion material flow path.

[0050] In some embodiments, the purge gas inlet 15 , the purge pump, and the purge outlet form a gas purge flow path.

[0051] In some embodiments, the air intake system further includes a shielding cover plate 9 and a leakage collection pipe 8; the shielding cover plate 9 is disposed on a portion of the outer wall on the other side of the air intake manifold 4, and the shielding cover plate 9 and a portion of the outer wall on the other side of the air intake manifold 4 form a closed enclosed cavity 14; the leakage collection pipe 8 is connected to the bottom of the enclosed cavity 14, and the leakage collection pipe 8 is used to collect and discharge the combustion materials leaked into the enclosed cavity 14.

[0052] In some embodiments, the air intake system further includes an explosion-proof valve 5, which is disposed on the air intake manifold 4 and communicated with the enclosed cavity 14. The explosion-proof valve 5 is used to prevent the air intake manifold 4 from bursting due to backfire in the air intake manifold 4.

[0053] like Figures 5 to 10 See also Figures 1 to 4 In some embodiments, the working principle of the intake system of the present invention is as follows: as a combustion material (methanol) enters the pipeline 7 through the combustion material, enters the common rail electronic control valve 13 in the methanol system, and the common rail electronic control valve 13 can control the methanol to enter the methanol common rail pipe 11 pipeline. The methanol common rail pipe 11 is also provided with a relief valve 12, and the relief valve 12 can ensure that the rail pressure in the methanol common rail pipe 11 is stable and adjustable. The methanol solution overflowing from the relief valve 12 flows back to the methanol volume tank through the methanol pipe 6. The methanol common rail pipe 11 is provided with a plurality of manifold electronic control valves 10. The manifold electronic control valve 10 can spray the methanol solution into the intake manifold 19 at an appropriate time and an appropriate pressure as needed. The above content constitutes a methanol flow path.

[0054] Fresh air enters the air manifold cavity 18 in the intake manifold 4 through the pipe (connected with the electronic throttle 1), the electronic throttle 1, the intake pipe 2, and the heater 3, and then enters the corresponding intake manifold 19 in sequence according to the ignition sequence of each cylinder. At this time, the methanol solution sprayed into the intake manifold 19 after the injection valve controlled by the manifold electronic control valve 10 is fully mixed with the air to form a mixed gas required for combustion and flow into the combustion chamber. Part of the outer wall of the intake manifold 4 and the intake manifold enclosure cover 9 form a closed space - the enclosure cavity 14, and the manifold electronic control valve 10, the common rail pipe 11, the overflow valve and the common rail electronic control valve 13 are completely enclosed in the enclosure cavity 14. The above content constitutes the air flow path.

[0055] The enclosure 14 is provided with a pipeline for guiding the leakage into the enclosure 14, which is connected to the dedicated leakage collection pipe 8. An explosion-proof valve 5 is provided on the intake manifold 4, which is used to prevent the intake manifold 4 from bursting due to backfire in the intake manifold 4, thereby ensuring the safety of the intake system. The enclosure 14 is also provided with two channels, namely, the enclosure scavenging inlet 15 and the enclosure scavenging outlet 17. The methanol detection sensor 16 is arranged in the enclosure 14, which can detect the concentration of methanol dissolved in the air in the enclosure 14 in real time, and transmit it to the ECU in real time according to the detection result. The ECU controls the purge pump to pass fresh air or nitrogen into the enclosure scavenging inlet 15 for gas scavenging, and discharge the methanol gas from the enclosure scavenging outlet 17 with the purge gas, thereby reducing the risk of gas accumulation in the enclosure 14.

[0056] In summary, the intake system of the present invention has the following advantages: first, the intake pipe methanol injection system is enclosed and protected, and even if there is leakage of methanol liquid, the methanol liquid and gas can be led back to the collector through the set pipeline; the methanol solution is first sprayed on the intake manifold and pre-mixed with fresh air before entering the combustion chamber. The intake pipe is equipped with an explosion-proof valve, which can effectively protect the intake system from backfire and explosion; the enclosed cavity has a real-time purge function, which overcomes the problem of high requirements for the injection system due to the corrosiveness of the combustion material, and also solves the problem of low reliability of the injection system, which in turn affects the reliability of the whole machine.

[0057] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. The scope of the present invention is intended to be limited by the claims and their equivalents.

Claims

1. An air intake system, characterized in that: include: An intake manifold, the interior of which includes a manifold cavity, and the intake manifold is used to provide air for combustion to the engine; A plurality of intake manifolds, one end of which is connected to the bottom of the intake manifold and communicated with the manifold cavity, and the other end of the intake manifold faces one side of the intake manifold and communicates with the combustion chamber; an enclosed cavity, which is arranged on the other side of the intake manifold; A common rail pipe, which is arranged in the enclosure cavity; A combustion material inlet pipe is provided on the air intake manifold and communicates with the enclosure chamber; A common rail electronic control valve, through which the common rail pipe is connected to the combustion material inlet pipeline; A fuel material return pipe, which is arranged on the air intake manifold and communicated with the enclosed cavity; a relief valve, through which the common rail pipe is connected to the fuel material return pipe; and a plurality of manifold electronic control valves, which are arranged between the common rail pipe and the injectors, each of the injectors is used to inject combustion substances into the intake manifold; The common rail electronic control valve, the overflow valve and the manifold electronic control valve are all electrically connected to the ECU.

2. The air intake system according to claim 1, characterized in that Also includes: a scavenging air inlet disposed at one end of the enclosure chamber; as well as a scavenging air outlet, which is arranged at the other end of the enclosure chamber; The purge gas can enter the enclosed cavity from the purge gas inlet, purge the combustion gas in the enclosed cavity, and be discharged from the purge gas outlet.

3. The air intake system according to claim 2, characterized in that: It also includes a detection sensor, which is arranged in the enclosed cavity and is used to detect the concentration of the combustion substance gas in the enclosed cavity.

4. The air intake system according to claim 3, characterized in that: The detection sensor is electrically connected to the ECU. The ECU can monitor the concentration of the combustion material gas in the enclosed chamber through the detection sensor, and control the purge pump in real time to pass the purge gas into the purge inlet for purge and then discharge it from the purge outlet.

5. The air intake system according to claim 2, characterized in that: It also includes an electronic throttle, an intake pipe and a heater which are connected in sequence. The heater is arranged at one end of the intake manifold and is connected to the manifold cavity. Fresh air passes through the electronic throttle, the intake pipe and the heater in sequence and then enters the manifold cavity.

6. The air intake system according to claim 5, characterized in that The electronic throttle valve, the intake pipe, the heater, the intake manifold, the manifold cavity, and the intake manifold form an air flow path.

7. The air intake system according to claim 2, characterized in that: The combustion material inlet pipe, the common rail electronic control valve, the common rail pipe, the manifold electronic control valve, the injector, the overflow valve, and the fuel material return pipe form a combustion material flow path.

8. The air intake system according to claim 4, characterized in that The purge gas inlet, the purge pump, and the purge outlet form a gas purge flow path.

9. The air intake system according to claim 2, characterized in that: Also includes: An enclosed cover plate, which is arranged on a portion of the outer wall on the other side of the intake manifold, and the enclosed cover plate and the portion of the outer wall on the other side of the intake manifold form a closed enclosed cavity; as well as A leakage collection pipe is communicated with the bottom of the enclosure chamber, and is used for collecting and discharging the combustion materials leaked into the enclosure chamber.

10. The air intake system according to claim 2, characterized in that It also includes an explosion-proof valve, which is arranged on the intake manifold and communicated with the enclosed cavity. The explosion-proof valve is used to prevent the intake manifold from bursting due to backfire in the intake manifold.

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