An engine burner

Abstract

The present invention discloses an engine burner, comprising a control unit, multiple cylinders, multiple methanol injectors, multiple glow plugs, an intake pipe, an exhaust pipe, an exhaust gas recirculation passage, and an intercooler passage. The exhaust gas recirculation passage includes a first passage and a second passage, the first passage being used to cool the exhaust gas; the intercooler passage includes a third passage and a fourth passage, the third passage being used to cool the outside air. Based on the engine's operating conditions, the control unit controls the opening and closing of the first, second, third, and fourth passages, as well as whether the first and third passages cool the air and exhaust gas, to adjust the flow to the intake pipe temperature. The formaldehyde injector is used to inject formaldehyde, forming a mixed gas with the air and exhaust gas. The piston in the cylinder compresses the mixed gas in a controlled manner, causing the mixed gas temperature to reach a preset combustion temperature, thereby achieving spontaneous combustion. The above structure ensures that the engine can start normally under different operating conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of engine burners, and in particular to an engine burner. Background Art

[0002] With the increasing scarcity of oil resources, various new energy vehicles have emerged and are becoming increasingly sophisticated with technological advancements. Methanol, a substance synthesized from raw materials such as coal, natural gas, wood, and garbage, is considered a leading clean fuel alternative to petroleum fuels. Methanol has attracted widespread attention due to its extensive methanol supply chain in China, its low price, and its low emissions when burned in engines. However, due to its very low C16A value of only around 3, its direct application in compression ignition engines is technically challenging. Therefore, to apply methanol to engines, researchers are primarily focusing on dual-fuel combustion, that is, the use of methanol-based fuels in engines.

[0003] Currently, there are three main approaches to using methanol-based fuel in engines: First, diesel is used for compression ignition, followed by a small amount of methanol injected from the gas phase to achieve a low-proportion blend; second, spark plugs are installed in the engine cylinders to ignite the methanol-based fuel; and third, a methanol-based compression ignition internal combustion engine system incorporates an in-line ignition agent preparation device, enabling the in-line preparation of the gaseous ignition agent, dimethylformamide, and its stable and precise delivery to the engine. However, the first approach suffers from limited economic benefits due to its low replacement ratio; the second approach requires significant modifications to the engine itself, making the modification more difficult; and the third approach, due to the in-line ignition agent preparation device, complicates the entire engine system and is prohibitively expensive. Furthermore, these three approaches merely address the challenges inherent in using methanol-based fuel in engines, not the application of pure methanol, and cannot implement customized control logic for different engine operating conditions. Summary of the Invention

[0004] The present invention provides an engine burner that utilizes methanol as fuel. By modifying and setting up an exhaust gas recirculation passage and an intercooler passage, and using a control unit to accurately regulate the temperature of the air in the intake pipe and the exhaust gas when the engine is in different operating conditions, the present invention ensures normal combustion of methanol under different engine operating conditions. The burner has a simple structure and low cost.

[0005] The present invention provides an engine burner, comprising a control unit, a plurality of cylinders, a plurality of methanol injectors, a plurality of glow plugs, an intake pipe, an exhaust pipe, an exhaust gas recirculation passage, and an intercooler passage;

[0006] The air inlet of the intake pipe is respectively connected to the exhaust gas recirculation passage and the intercooler passage, the air outlet of the intake pipe is connected to the air inlet of the cylinder, the air outlet of the cylinder is connected to the air inlet of the exhaust pipe, the number of the glow plugs and the formaldehyde injectors is the same as the number of the cylinders, and the glow plugs and the formaldehyde injectors are arranged in the cylinders;

[0007] The exhaust gas recirculation passage includes a first passage and a second passage, the first passage is used to cool the exhaust gas; the intercooler passage includes a third passage and a fourth passage, the third passage is used to cool the external air;

[0008] The control unit is electrically connected to the glow plug, and the control unit is used to control the temperature of the glow plug according to the working conditions of the engine;

[0009] According to the working conditions of the engine, the control unit is further used to control the opening and closing of the first passage, the second passage, the third passage and the fourth passage, and to control whether the first passage and the third passage cool the air and exhaust gas to adjust the temperature of the air flowing to the intake pipe;

[0010] The exhaust pipe is used to discharge the exhaust gas generated in the cylinder, the intake pipe is used to circulate air and exhaust gas to the cylinder, and the formaldehyde injector is used to inject formaldehyde so that the formaldehyde is mixed with the air and exhaust gas to form a mixed gas; the piston in the cylinder is controlled to compress the mixed gas so that the temperature of the mixed gas reaches the preset combustion temperature to achieve spontaneous combustion.

[0011] Optionally, the operating conditions of the engine include engine cold start or low load operating conditions, medium load or low speed operating conditions, and high load operating conditions;

[0012] When the engine is in a cold start or low load condition, the control unit is further configured to control the first passage and the third passage to be closed, the second passage and the fourth passage to be connected, and the first passage and the third passage to not cool the air and exhaust gas so that the temperature flowing to the intake pipe is within a first preset temperature range; the control unit is further configured to control the glow plug to be within a second preset temperature range to assist the mixed gas so that the temperature of the mixed gas reaches a preset combustion temperature; or,

[0013] When the engine is in a medium load or low speed condition, the control unit is further configured to control the first passage or the third passage to be closed, and to control the second passage to be open when the first passage is closed, and to control the fourth passage to be open when the third passage is closed, and to control the first passage or the third passage to cool the air and exhaust gas so that the temperature flowing to the intake pipe is within a third preset temperature range; the control unit is further configured to control the glow plug to be within a fourth preset temperature range so that the temperature of the mixed gas reaches a preset combustion temperature; or,

[0014] When the engine is in a high-load operating condition, the control unit is further configured to control the first and third passages to be open, the second and fourth passages to be closed, and the first and third passages to be controlled to cool the air and exhaust gas so that the temperature flowing to the intake pipe is within a fifth preset temperature range; the control unit is further configured to control the glow plug to be within a sixth preset temperature range so that the temperature of the mixed gas reaches a preset combustion temperature;

[0015] The first preset temperature range is smaller than the third preset temperature range, the third preset temperature range is smaller than the fifth preset temperature range, the second preset temperature range is larger than the fourth preset temperature range, and the second preset temperature range is larger than the sixth preset temperature range.

[0016] Optionally, an EGR cooler is provided on the first passage, and an intercooler is provided on the third passage. The control unit is electrically connected to the EGR cooler and the intercooler respectively to control the EGR cooler to cool the exhaust gas and control the intercooler to cool the air.

[0017] Optionally, the first passage and the second passage intersect, and a first bypass valve is provided at the intersection; the third passage and the fourth passage intersect, and a second bypass valve is provided at the intersection;

[0018] The control unit is also electrically connected to the first bypass valve and the second bypass valve respectively, and is further used to control the opening of the first bypass valve to control the flow rate of the first passage and the second passage;

[0019] The control unit is further used to control the opening of the second bypass valve to control the flow rates of the third passage and the fourth passage.

[0020] Optionally, the engine combustor further includes an exhaust manifold;

[0021] The air inlet of the exhaust manifold is connected to the air outlet of each cylinder respectively, and the air outlet of the exhaust manifold is connected to the air inlet of the exhaust pipe. The exhaust manifold is used to discharge the exhaust generated by each cylinder into the exhaust pipe.

[0022] Optionally, the engine combustor further includes a turbine;

[0023] The air inlet of the turbine is communicated with the air outlet of the exhaust pipe so that excess exhaust gas is discharged as exhaust gas.

[0024] Optionally, the engine combustor further includes a compressor;

[0025] The compressor and turbine are fixedly connected through the supercharger shaft; the turbine is also used to drive the compressor to make it work;

[0026] The compressor is connected to the air inlet of the intercooler passage, and the compressor is used to compress the inhaled air.

[0027] Optionally, the compression ratio ε of the cylinder satisfies: ε≥20.

[0028] Optionally, the engine combustor further includes an intake manifold;

[0029] The air inlet of the intake manifold is connected to the air outlet of the intake pipe, and the air outlet of the intake manifold is respectively connected to the air inlet of each cylinder. The intake manifold is used to evenly circulate air and exhaust gas into each cylinder.

[0030] Optionally, the engine burner further includes an EGR valve;

[0031] The EGR valve is arranged between the outlet of the exhaust gas recirculation passage and the outlet of the intercooler passage;

[0032] The control unit is also electrically connected to the EGR valve for controlling the opening of the EGR valve to adjust the flow of exhaust gas.

[0033] The technical solution of the present invention controls the opening and closing of the first, second, third, and fourth passages through a control unit when the engine is in different operating conditions. This allows the exhaust gas generated by the combustion of methanol flowing in the exhaust pipe to flow through the first or second passage to the intake pipe, while fresh air from the outside flows through the third or fourth passage to the intake pipe. The intake pipe circulates air and exhaust gas, and the temperatures of the air and exhaust gas flowing in the intake pipe vary depending on the opening and closing conditions of the first, second, third, and fourth passages. The intake pipe then flows the air and exhaust gas into the cylinder, where a methanol injector injects methanol, which mixes with the air and exhaust gas to form a mixed gas. The piston in the cylinder compresses the mixed gas under control, and the control unit controls the temperature of the glow plug to output a controlled output, causing the compressed mixed gas to reach a preset combustion temperature, thereby achieving spontaneous combustion. By utilizing the above structure and using methanol as fuel, the exhaust gas recirculation passage and the intercooler passage are modified and set up, and the temperature of the air and exhaust gas in the intake pipe is precisely regulated by the control unit when the engine is in different operating conditions, it is achieved that the normal combustion of methanol can be guaranteed when the engine is in different operating conditions. The structure is simple and the cost is low.

[0034] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 A schematic structural diagram of an engine burner provided by an embodiment of the present invention;

[0037] Figure 2 A structural diagram of the connection relationship of an engine burner provided by an embodiment of the present invention;

[0038] Figure 3 A schematic structural diagram of a second engine burner provided by an embodiment of the present invention;

[0039] Figure 4 A schematic structural diagram of a second type of engine burner connection relationship provided by an embodiment of the present invention;

[0040] Figure 5 A structural diagram of the third engine burner connection relationship provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0042] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0043] In one embodiment, Figure 1 A schematic structural diagram of an engine burner provided by an embodiment of the present invention is shown in FIG. Figure 2 The present invention provides a structural diagram of an engine burner connection relationship, the engine burner can be configured in a vehicle, such as Figure 1 and Figure 2 As shown, it includes a control unit 1, multiple cylinders 2, multiple methanol injectors 3, multiple glow plugs 4, an intake pipe 5, an exhaust pipe 6, an exhaust gas recirculation passage 7 and an intercooler passage 8; the air inlet of the intake pipe 5 is connected to the exhaust gas recirculation passage 7 and the intercooler passage 8 respectively, the air outlet of the intake pipe 5 is connected to the air inlet of the cylinder 2, and the air outlet of the cylinder 2 is connected to the air inlet of the exhaust pipe 6, the number of glow plugs 4, methanol injectors 3 and cylinder 2 is the same, and the glow plugs 4 and methanol injectors 3 are arranged in the cylinder 2; the exhaust gas recirculation passage 7 includes a first passage 71 and a second passage 72, the first passage 71 is used to cool the exhaust gas; the intercooler passage 8 includes a third passage 81 and a fourth passage 82, the third passage 81 is used to cool the outside air; the control Unit 1 is electrically connected to the glow plug 4, and the control unit 1 is used to control the temperature of the glow plug 4 according to the operating conditions of the engine; according to the operating conditions of the engine, the control unit 1 is also used to control the conduction and closing of the first passage 71, the second passage 72, the third passage 81 and the fourth passage 82, and control whether the first passage 71 and the third passage 81 cool the air and exhaust to adjust the temperature flowing to the intake pipe 5; the exhaust pipe 6 is used to discharge the exhaust gas generated in the cylinder 2, the intake pipe 5 is used to circulate air and exhaust to the cylinder 2, and the methanol injector 3 is used to inject methanol so that the methanol is mixed with the air and exhaust to form a mixed gas; the piston in the cylinder 2 is controlled to compress the mixed gas so that the temperature of the mixed gas reaches a preset combustion temperature to achieve spontaneous combustion.

[0044] Cylinder 2 is the engine's combustion chamber, housing a methanol injector 3 and a glow plug 4. Furthermore, the piston in cylinder 2 is controlled to reciprocate, compressing the methanol-air mixture until it reaches a preset temperature. To ensure engine starting, multiple cylinders 2 are typically provided. Correspondingly, each cylinder 2 is equipped with a methanol injector 3 and a glow plug 4 to ensure methanol combustion. The methanol injector 3 is used to inject methanol. The glow plug 4 assists in engine starting in cold conditions or when the engine load is low. In this embodiment, the glow plug 4 is electrically connected to a control unit 1, which controls the temperature of the glow plug 4 based on the current engine operating conditions. In one specific embodiment, a preset correspondence exists between the engine load, engine speed, and the temperature of the glow plug 4. Given the engine load and speed, the temperature of the glow plug 4 can be determined. In another specific embodiment, different engine operating conditions correspond to different currents in the glow plug 4. A preset correspondence exists between the current and temperature of the glow plug 4. Therefore, the control unit 1 can control the temperature of the glow plug 4 based on the received current. The specific correspondence can be determined based on actual conditions and is not limited here. The intake pipe 5 is a passage for introducing air and exhaust gas into the engine cylinder 2, allowing the methanol injected into the cylinder 2 to mix with the air and exhaust gas. The exhaust pipe 6 is a passage for discharging exhaust gas generated by methanol combustion. The exhaust gas recirculation passage 7 is a passage for circulating exhaust gas generated by methanol combustion into the cylinder 2. The intercooler passage 8 is a passage for circulating fresh air from the outside into the cylinder 2. In this embodiment, the exhaust gas recirculation passage 7 includes a first passage 71 and a second passage 72, and the intercooler passage 8 includes a third passage 81 and a fourth passage 82. The first passage 71 and the third passage 81 are cooling passages, meaning that the first passage 71 cools the exhaust gas, and the third passage 81 cools the air. The second passage 72 and the fourth passage 82 are both bypass passages, i.e., passages that allow exhaust gas and air to flow directly to the intake pipe 5. The control unit 1 is the primary controller of this embodiment, and is used to control the output temperature of the glow plug 4 and the opening and closing of the first passage 71, the second passage 72, the third passage 81, and the fourth passage 82 according to the engine operating conditions.

[0045] Specifically, when the engine is in different working conditions, the control unit 1 will control the conduction or closing of the first passage 71, the second passage 72, the third passage 81 and the fourth passage 82 according to the working conditions of the engine. For example, the first passage 71 and the third passage 81 can be controlled to be conducted, and the second passage 72 and the fourth passage 82 can be controlled to be closed, or the first passage 71 and the fourth passage 82 can be controlled to be conducted, and the second passage 72 and the third passage 81 can be controlled to be closed, or the second passage 72 and the third passage 81 can be controlled to be conducted, and the first passage 71 and the fourth passage 82 can be controlled to be closed, or the second passage 72 and the third passage 81 can be controlled to be conducted, and the first passage 71 and the fourth passage 82 can be controlled to be conducted, and the first passage 71 and the third passage 81 can be controlled to be closed. When first passage 71 is open, it can be controlled to cool the exhaust gas; when it is closed, it can be controlled not to cool the exhaust gas. When third passage 81 is open, it can be controlled to cool the air; when it is closed, it can be controlled not to cool the air, thereby achieving different temperatures for the air and exhaust gas entering intake pipe 5. After control unit 1 completes control of opening or closing first passage 71, second passage 72, third passage 81, and fourth passage 82, exhaust gas recirculation passage 7 can be controlled to cool or not cool the exhaust gas generated by exhaust pipe 6, while intercooler passage 8 can be controlled to cool or not cool the intake air. After passing through exhaust gas recirculation passage 7 and air through intercooler passage 8, they enter the intake port of intake pipe 5 and flow through intake pipe 5 into cylinder 2. Methanol injector 3 in cylinder 2 injects methanol, which mixes with the air and exhaust gas entering cylinder 2 to form a mixed gas. In addition, control unit 1 controls glow plug 4 to output a corresponding temperature based on the engine's operating condition. For example, when the engine is in a first operating condition, glow plug 4 is controlled to output a high temperature range to assist in combustion of the mixed gas; when the engine is in a second operating condition, glow plug 4 is controlled to output a low temperature range. The specific temperature can be determined based on actual conditions and is not specifically limited herein. After the temperature of glow plug 4 is determined, the piston in cylinder 2 is controlled to compress the mixed gas, raising the temperature of the mixed gas to a preset combustion temperature, causing compression ignition of the methanol and achieving normal engine startup.

[0046] The technical solution of the embodiment of the present invention is to control the opening and closing of the first, second, third, and fourth passages through a control unit when the engine is in different operating conditions. This allows the exhaust gas generated by the combustion of methanol flowing in the exhaust pipe to flow into the intake pipe through the first or second passage, while fresh air from the outside flows into the intake pipe through the third or fourth passage. The intake pipe will circulate air and exhaust gas, and the temperature of the air and exhaust gas flowing in the intake pipe will vary depending on the opening and closing conditions of the first, second, third, and fourth passages. The intake pipe will flow air and exhaust gas into the cylinder, where a methanol injector injects methanol, which mixes with the air and exhaust gas to form a mixed gas. The piston in the cylinder is controlled to compress the mixed gas, and the control unit controls the temperature output of the glow plug to make the compressed mixed gas reach a preset combustion temperature, achieving spontaneous combustion. By utilizing the above structure and using methanol as fuel, the exhaust gas recirculation passage and the intercooler passage are modified and set up, and the temperature of the air and exhaust gas in the intake pipe is precisely regulated by the control unit when the engine is in different operating conditions, it is achieved that the normal combustion of methanol can be guaranteed when the engine is in different operating conditions. The structure is simple and the cost is low.

[0047] Optionally, the compression ratio ε of cylinder 2 satisfies: ε≥20.

[0048] The compression ratio ε of cylinder 2 refers to the degree to which the mixed gas in cylinder 2 is compressed during the compression stroke of engine cylinder 2, and is the ratio of the volume of the gas in cylinder 2 at the end of the intake stroke to the volume of the gas in cylinder 2 at the end of the compression stroke.

[0049] Specifically, the compression ratio ε of cylinder 2 is set to ≥ 20. For example, ε can be 20, 21, 22, 23, 24, or 25, etc., and can be determined based on actual conditions and is not specifically limited herein. In this embodiment, the higher the compression ratio ε of cylinder 2, the higher the temperature generated when the piston in cylinder 2 is controlled to compress the mixed gas, achieving more efficient methanol auto-ignition. Furthermore, the high compression ratio ε of cylinder 2 can also improve combustion efficiency, reduce fuel consumption, and enhance engine performance.

[0050] Optional, continue to refer to Figure 1 and Figure 2, the operating conditions of the engine include engine cold start or low load conditions, medium load or low speed conditions and high load conditions; when the engine is in engine cold start or low load conditions, the control unit 1 is further used to control the first passage 71 and the third passage 81 to be closed, the second passage 72 and the fourth passage 82 to be connected, and the first passage 71 and the third passage 81 to not cool the air and exhaust gas, so that the temperature flowing to the intake pipe 5 is within the first preset temperature range; the control unit 1 is further used to control the glow plug 4 to be within the second preset temperature range, assisting the mixed gas so that the temperature of the mixed gas reaches the preset combustion temperature; or, when the engine is in medium load or low speed conditions, the control unit 1 is further used to control the first passage 71 or the third passage 81 to be closed, and control the second passage 72 to be connected when the first passage 71 is closed, control the fourth passage 82 to be connected when the third passage 81 is closed, and control the first passage 71 or the third passage 81 to be closed. 1 cools the air and exhaust gas so that the temperature flowing to the intake pipe 5 is within a third preset temperature range; the control unit 1 is further used to control the glow plug 4 to be within a fourth preset temperature range so that the temperature of the mixed gas reaches a preset combustion temperature; alternatively, when the engine is in a high-load condition, the control unit 1 is further used to control the first passage 71 and the third passage 81 to be conductive, and the second passage 72 and the fourth passage 82 to be closed, and control the first passage 71 and the third passage 81 to cool the air and exhaust gas so that the temperature flowing to the intake pipe 5 is within a fifth preset temperature range; the control unit 1 is further used to control the glow plug 4 to be within a sixth preset temperature range so that the temperature of the mixed gas reaches a preset combustion temperature; the first preset temperature range is smaller than the third preset temperature range, the third preset temperature range is smaller than the fifth preset temperature range, the second preset temperature range is larger than the fourth preset temperature range, and the second preset temperature range is larger than the sixth preset temperature range.

[0051] Specifically, during an engine cold start or low-load operation, the exhaust and air flowing through exhaust pipe 6 are relatively cold, and methanol combustion requires high temperatures. Therefore, when the exhaust passes through exhaust gas recirculation passage 7 and the air passes through intercooler passage 8, cooling of the exhaust and air is not required, maintaining the original temperature. In this embodiment, control unit 1 controls the closing of first passage 71 and third passage 81 while simultaneously controlling the opening of second passage 72 and fourth passage 82. This ensures that when first passage 71 is closed, exhaust cooling is disabled, and when third passage 81 is closed, air cooling is disabled, ensuring that the air and exhaust flow through intake pipe 5 to cylinder 2 at their original temperature, i.e., within the first preset temperature range. The temperature of the mixed gas after controlled compression by the piston in cylinder 2 still does not reach the preset combustion temperature, causing methanol to spontaneously ignite. Therefore, control unit 1 controls glow plug 4 to output a temperature within the second preset temperature range under these operating conditions. The second preset temperature range is a high temperature range, and in this embodiment, the second preset temperature range is 1100°C-1300°C. With the assistance of the high temperature range output by the glow plug 4, the combustion in the accessory area of ​​the high temperature glow plug 4 generates high temperature and high pressure, so that the temperature of the mixed gas reaches the preset combustion temperature. For example, the preset combustion temperature is 600℃-900℃, resulting in the methanol injected into the cylinder 2 being compression ignited, and the engine starts quickly or performs external work.

[0052] When the engine is operating at medium load or low speed, the temperature of the exhaust gas and air flowing through the exhaust pipe 6 is slightly higher. If the temperature of the exhaust gas and air after compression is too high, the engine may be damaged. Therefore, when the exhaust gas passes through the exhaust gas recirculation passage 7 and the air passes through the intercooler passage 8, the exhaust gas or air needs to be cooled so that the temperature of the exhaust gas and air is controlled within a third preset temperature range, which is greater than the first preset temperature range. In this embodiment, the control unit 1 can control the first passage 71 or the third passage 81 to be closed, and control the second passage 72 to be open when the first passage 71 is closed, and control the fourth passage 82 to be open when the third passage 81 is closed. When the first passage 71 is open, the first passage 71 is controlled to cool the exhaust gas, and when the third passage 81 is open, the third passage 81 is controlled to cool the air. The air and exhaust gas are appropriately cooled and cooled until the temperature reaches the third preset temperature range and flows through the intake pipe 5 to the cylinder 2. At this time, the piston in the cylinder 2 is controlled to compress the mixed gas to a temperature that reaches a preset combustion temperature, causing the methanol to self-ignite, without the need for high-temperature assistance from the glow plug 4. Therefore, the control unit 1 can control the glow plug 4 to output a fourth preset temperature range under this operating condition, wherein the fourth preset temperature range is a low-temperature range, and the fourth preset temperature range is smaller than the second preset temperature range. In this embodiment, the fourth preset temperature range is 700°C-800°C. When methanol is injected into the cylinder 2 from the methanol injector 3, the low-temperature glow plug 4 will not pre-ignite the nearby mixed gas, but will compress the mixed gas to a preset combustion temperature under a controlled state through the engine's piston. For example, the preset combustion temperature is 600°C-900°C. At this temperature, an ignition flame will be generated, causing the methanol in the cylinder 2 to burn, and the engine will start to perform external work.

[0053] When the engine is operating at high load, the exhaust and air flowing through the exhaust pipe 6 are at very high temperatures. When these high-temperature exhaust and air enter the intake pipe 5, they can cause thermal shock, damaging the engine and affecting its performance and service life. Therefore, when the exhaust passes through the exhaust gas recirculation passage 7 and the air passes through the intercooler passage 8, the exhaust and air must be cooled, respectively, to maintain their temperatures within a fifth preset temperature range. The fifth preset temperature range is greater than the third preset temperature range. In this embodiment, the control unit 1 can control the first passage 71 and the third passage 81 to be open, while simultaneously controlling the second passage 72 and the fourth passage 82 to be closed. This allows the first passage 71 to cool the exhaust when the first passage 71 is open, and the third passage 81 to cool the air when the third passage 81 is open. This allows the air and exhaust to be cooled, respectively, to reach the fifth preset temperature range and then circulate through the intake pipe 5 to the cylinder 2. At this point, the piston in cylinder 2 is controlled to compress the mixed gas to a temperature reaching a preset combustion temperature, causing the methanol to spontaneously ignite. High-temperature assistance from the glow plug 4 is no longer required. Therefore, the control unit 1 controls the glow plug 4 to output a temperature within a sixth preset temperature range under this operating condition. The sixth preset temperature range is a low-temperature range that is lower than the second preset temperature range. In this embodiment, the sixth preset temperature range is 700°C-800°C. When methanol is injected into cylinder 2 from the methanol injector 3, the low-temperature glow plug 4 does not pre-ignite the nearby mixed gas. Instead, the engine's piston controls the mixed gas to a preset combustion temperature, illustratively, 600°C-900°C. At this temperature, a pilot flame is generated, causing the methanol in cylinder 2 to combust, and the engine starts to produce external work. This ensures normal and rapid engine starting under various operating conditions.

[0054] It should be noted that the high temperature range of the glow plug 4 is 1100°C-1300°C, and the low temperature range is 700°C-800°C. This is to ensure that when the glow plug 4 is in the low temperature range, the temperature of the glow plug 4 can be quickly raised to the high temperature range when it is heated. Similarly, when the glow plug 4 is in the high temperature range, the temperature of the glow plug 4 can be quickly lowered to the low temperature range when it is cooled, thereby improving the conversion rate and saving time.

[0055] Optional, Figure 3 A schematic structural diagram of a second engine burner provided in an embodiment of the present invention, Figure 4 The structural diagram of the second engine burner connection relationship provided by the embodiment of the present invention is shown in FIG. Figure 3 and Figure 4As shown, an EGR cooler 711 is provided on the first passage 71, and an intercooler 811 is provided on the third passage 81. The control unit 1 is electrically connected to the EGR cooler 711 and the intercooler 811 respectively to control the EGR cooler 711 to cool the exhaust gas, and to control the intercooler 811 to cool the air.

[0056] The EGR cooler 711 is a device for cooling the exhaust gas generated by the combustion of formaldehyde to reduce the exhaust gas emitted by the vehicle. The intercooler 811 is a device for cooling the air.

[0057] Specifically, when the first passage 71 is open, the control unit 1 controls the EGR cooler 711 to operate so that the EGR cooler 711 cools the exhaust gas, and when the third passage 81 is open, the control unit 1 controls the intercooler 811 to operate so that the intercooler 811 cools the air.

[0058] Optional, Figure 5 The structural diagram of the third engine burner connection relationship provided by the embodiment of the present invention is shown in FIG. Figure 5 As shown, the first passage 71 and the second passage 72 intersect, and a first bypass valve 70 is provided at the intersection; the third passage 81 and the fourth passage 82 intersect, and a second bypass valve 80 is provided at the intersection; the control unit 1 is also electrically connected to the first bypass valve 70 and the second bypass valve 80 respectively, and the control unit 1 is also used to control the opening of the first bypass valve 70 to control the flow rate of the first passage 71 and the second passage 72; the control unit 1 is also used to control the opening of the second bypass valve 80 to control the flow rate of the third passage 81 and the fourth passage 82.

[0059] The first bypass valve 70 and the second bypass valve 80 are both valves for controlling the flow rate and can be set beside the main pipeline to adjust and control the flow rate. In this embodiment, the first bypass valve 70 is set at the intersection of the first passage 71 and the second passage 72. Figure 3The first bypass valve 70 is located at the intersection of the air inlet of the first passage 71 and the air inlet of the second passage 72. Of course, the first bypass valve 70 can also be set at the intersection of the air outlet of the first passage 71 and the air outlet of the second passage 72, and there is no limitation here. The opening of the first bypass valve 70 is controlled by the control unit 1, so that the flow rate of the exhaust gas flowing from the first passage 71 and the second passage 72 can be controlled. For example, the exhaust flow rate is 100%. By controlling the opening of the first bypass valve 70, a part of the exhaust flow can be circulated through the first passage 71, and another part of the exhaust flow can be circulated through the second passage 72. The exhaust can also be made to pass only through the first passage 71 or the second passage 72. The specific adjustment can be made according to the working conditions of the engine, and there is no limitation here. Similarly, the second bypass valve 80 is set at the intersection of the third passage 81 and the fourth passage 82, refer to Figure 3 The second bypass valve 80 is located at the intersection of the air inlet of the third passage 81 and the air inlet of the fourth passage 82. Of course, the second bypass valve 80 can also be set at the intersection of the air outlet of the third passage 81 and the air outlet of the fourth passage 82, and this is not limited here. The opening of the second bypass valve 80 is controlled by the control unit 1, so that the flow rate of air flowing through the third passage 81 and the fourth passage 82 can be controlled. For example, the air flow rate is 100%. By controlling the opening of the second bypass valve 80, a portion of the air flow can be circulated through the third passage 81 and another portion of the air flow can be circulated through the fourth passage 82. It is also possible to allow air to flow only through the third passage 81 or the fourth passage 82. The specific adjustment can be made according to the operating conditions of the engine, and this is not limited here.

[0060] Optional, continue to refer to Figure 3 The engine burner also includes an exhaust manifold 9; the air inlet of the exhaust manifold 9 is respectively connected to the air outlet of each cylinder 2, and the air outlet of the exhaust manifold 9 is connected to the air inlet of the exhaust pipe 6. The exhaust manifold 9 is used to discharge the exhaust generated by each cylinder 2 to the exhaust pipe 6.

[0061] The exhaust manifold 9 is a passageway for collecting and discharging exhaust gas generated by methanol combustion from each of the engine's cylinders 2. In this embodiment, an exhaust manifold 9 is provided at the outlet of each cylinder 2, allowing the exhaust gas generated by methanol combustion in each cylinder 2 to flow through the corresponding exhaust manifold 9 to the exhaust pipe 6.

[0062] Optional, continue to refer to Figure 3 The engine combustor further includes a turbine 10; the air inlet of the turbine 10 is communicated with the air outlet of the exhaust pipe 6 so that excess exhaust gas is discharged as exhaust gas.

[0063] The turbine 10 is a mechanical device that utilizes the energy of a fluid, such as air, to generate power. Specifically, the exhaust gas produced by methanol combustion flows into the turbine 10, driving the turbine's impeller to rotate, thereby generating power. In this embodiment, after the exhaust gas rotates the turbine 10, the remaining exhaust gas not used for recirculation is discharged from the engine as exhaust gas.

[0064] Optional, continue to refer to Figure 3 The engine combustor also includes a compressor 20; the compressor 20 is fixedly connected to the turbine 10 through a supercharger shaft 110; the turbine 10 is also used to drive the compressor 20 to enable the compressor 20 to work; the compressor 20 is connected to the air inlet of the intercooler 811 passage 8, and the compressor 20 is used to compress the inhaled air.

[0065] The compressor 20 is a device that pressurizes and heats air drawn in from the outside. In this embodiment, the compressor 20 is fixedly connected to the turbine 10 via a supercharger shaft 110. As the turbine 10 rotates, it drives the compressor 20 via the supercharger shaft 110, allowing the compressor 20 to continuously draw in and pressurize and heat air from the outside, ensuring rapid engine startup.

[0066] Optional, continue to refer to Figure 3 The engine burner also includes an intake manifold 30; the air inlet of the intake manifold 30 is connected to the air outlet of the intake pipe 5, and the air outlet of the intake manifold 30 is respectively connected to the air inlet of each cylinder 2, and the intake manifold 30 is used to evenly circulate air and exhaust gas to each cylinder 2.

[0067] The intake manifold 30 is a passage that evenly distributes the mixture of air and exhaust gas to each cylinder 2 of the engine. In this embodiment, the intake manifold 30 is provided at the intake port of each cylinder 2 so that the air and exhaust gas at the outlet of the intake pipe 5 can flow evenly into each cylinder 2, ensuring that a mixed gas can be formed in each cylinder 2.

[0068] Optional, continue to refer to Figure 3 and Figure 5 The engine burner also includes an EGR valve 40; the EGR valve 40 is arranged between the outlet of the exhaust gas recirculation passage 7 and the outlet of the intercooler 811 passage 8; the control unit 1 is also electrically connected to the EGR valve 40, for controlling the opening of the EGR valve 40 to adjust the exhaust flow rate.

[0069] The EGR valve 40 is a structure used to control the amount of exhaust gas recirculated back to the intake pipe 5. In this embodiment, the EGR valve 40 is electrically connected to the control unit 1 and is used to achieve different opening degrees according to the instructions of the control unit 1 to adjust the exhaust gas flow entering the intake pipe 5 to meet the requirements of different engine operating conditions.

[0070] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0071] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. An engine burner, characterized in that: It includes a control unit, multiple cylinders, multiple methanol injectors, multiple glow plugs, an intake pipe, an exhaust pipe, an exhaust gas recirculation passage, and an intercooler passage; The air inlet of the intake pipe is communicated with the exhaust gas recirculation passage and the intercooler passage respectively, the air outlet of the intake pipe is communicated with the air inlet of the cylinder, the air outlet of the cylinder is communicated with the air inlet of the exhaust pipe, the number of the glow plugs, the methanol injectors and the cylinders is the same, and the glow plugs and the methanol injectors are arranged in the cylinders; The exhaust gas recirculation passage includes a first passage and a second passage, the first passage is used to cool the exhaust gas; the intercooler passage includes a third passage and a fourth passage, the third passage is used to cool the external air; The control unit is electrically connected to the glow plug, and the control unit is used to control the temperature of the glow plug according to the working conditions of the engine; The control unit is further configured to control the opening and closing of the first passage, the second passage, the third passage, and the fourth passage according to the operating conditions of the engine, and to control whether the first passage and the third passage cool the exhaust gas and the outside air to adjust the temperature of the air flowing to the intake pipe; The exhaust pipe is used to discharge the exhaust gas generated in the cylinder, the intake pipe is used to circulate the air and the exhaust gas into the cylinder, and the methanol injector is used to inject formaldehyde so that the formaldehyde is mixed with the air and the exhaust gas to form a mixed gas; the piston in the cylinder is controlled to compress the mixed gas so that the temperature of the mixed gas reaches a preset combustion temperature to achieve spontaneous combustion; The engine operating conditions include engine cold start or low load operating conditions, medium load or low speed operating conditions and high load operating conditions; When the engine is in the engine cold start or low load operating condition, the control unit is further configured to control the first passage and the third passage to be closed, the second passage and the fourth passage to be connected, and the first passage and the third passage to not cool the air and the exhaust gas so that the temperature flowing to the intake pipe is within a first preset temperature range; the control unit is further configured to control the glow plug to be within a second preset temperature range to assist the mixed gas so that the temperature of the mixed gas reaches the preset combustion temperature; or, When the engine is in the medium load or low speed operating condition, the control unit is further configured to control the first passage or the third passage to be closed, and to control the second passage to be open when the first passage is closed, and to control the fourth passage to be open when the third passage is closed, and to control the first passage or the third passage to cool the exhaust gas or the outside air so that the temperature of the air flowing to the intake pipe is within a third preset temperature range; the control unit is further configured to control the glow plug to be within a fourth preset temperature range so that the temperature of the mixed gas reaches the preset combustion temperature; or, When the engine is in the high-load operating condition, the control unit is further configured to control the first passage and the third passage to be open, the second passage and the fourth passage to be closed, and the first passage and the third passage to cool the exhaust gas and the outside air so that the temperature of the air flowing to the intake pipe is within a fifth preset temperature range; the control unit is further configured to control the glow plug to be within a sixth preset temperature range so that the temperature of the mixed gas reaches the preset combustion temperature; The first preset temperature range is smaller than the third preset temperature range, the third preset temperature range is smaller than the fifth preset temperature range, the second preset temperature range is larger than the fourth preset temperature range, and the second preset temperature range is larger than the sixth preset temperature range.

2. The engine burner according to claim 1, characterized in that: An EGR cooler is provided on the first passage, and an intercooler is provided on the third passage. The control unit is electrically connected to the EGR cooler and the intercooler respectively to control the EGR cooler to cool the exhaust gas and control the intercooler to cool the air.

3. The engine burner according to claim 1, characterized in that The first passage and the second passage intersect, and a first bypass valve is provided at the intersection; the third passage and the fourth passage intersect, and a second bypass valve is provided at the intersection; The control unit is also electrically connected to the first bypass valve and the second bypass valve respectively, and is further used to control the opening of the first bypass valve to control the flow rate of the first passage and the second passage; The control unit is further configured to control the opening of the second bypass valve to control the flow rates of the third passage and the fourth passage.

4. The engine burner according to claim 1, characterized in that Also included are the exhaust manifolds; The air inlet of the exhaust manifold is communicated with the air outlet of each cylinder respectively, and the air outlet of the exhaust manifold is communicated with the air inlet of the exhaust pipe. The exhaust manifold is used to discharge the exhaust gas generated by each cylinder into the exhaust pipe.

5. The engine burner according to claim 1, characterized in that Also includes turbines; The air inlet of the turbine is communicated with the air outlet of the exhaust pipe so that excess exhaust gas is discharged as exhaust gas.

6. The engine burner according to claim 5, characterized in that: Also includes compressor; The compressor and the turbine are fixedly connected via a supercharger shaft; the turbine is also used to drive the compressor to operate; The compressor is communicated with the air inlet of the intercooler passage, and the compressor is used for compressing the inhaled air.

7. The engine burner according to claim 1, characterized in that The compression ratio ε of the cylinder satisfies: ε≥20.

8. The engine burner according to claim 1, characterized in that Also included is the intake manifold; The air inlet of the intake manifold is communicated with the air outlet of the intake pipe, and the air outlet of the intake manifold is respectively communicated with the air inlet of each cylinder. The intake manifold is used to evenly circulate the air and the exhaust gas into each cylinder.

9. The engine burner according to claim 1, characterized in that: Also includes EGR valve; The EGR valve is arranged between the air outlet of the exhaust gas recirculation passage and the air outlet of the intercooler passage; The control unit is also electrically connected to the EGR valve and is used to control the opening of the EGR valve to adjust the flow rate of the exhaust gas.

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