Exhaust gas recirculation system and exhaust gas recirculation control method

Abstract

The present application relates to an exhaust gas recirculation system and an exhaust gas recirculation control method. The system includes a control unit, an engine, an exhaust gas recirculation valve, an intercooler, a water reservoir, an intake pipe and an exhaust pipe; the engine is connected to the intake pipe and the exhaust pipe respectively; the exhaust gas recirculation valve is located between the exhaust pipe and the inlet end of the intercooler; the intercooler includes a circulating cooling water channel and an exhaust gas channel that are independent of each other; the outlet end of the intercooler is connected to the water reservoir; the exhaust port and the outlet end of the intercooler are both connected to the intake pipe; the control unit is used to control the exhaust gas recirculation valve to open after receiving an exhaust gas recirculation instruction, so that the waste water flowing out of the exhaust gas channel flows into the water reservoir, and the exhaust gas flowing out of the exhaust gas channel flows into the engine through the outlet end, the exhaust port of the water reservoir and the intake pipe. The use of this method can prevent liquid water from accumulating at the intercooler or flowing into the intake pipe, thereby ensuring the normal operation of the engine.

Description

Technical Field

[0001] The present application relates to the field of engine control technology, and in particular to an exhaust gas recirculation system and an exhaust gas recirculation control method. Background Art

[0002] Hydrogen engines are recognized as a new generation of new energy internal combustion engines with great development potential due to their advantages such as simple and abundant sources, fast combustion speed and zero carbon emissions. Hydrogen engines using EGR (Exhaust Gas Recirculation) technology will generate a large amount of water after hydrogen is burned in the cylinder. After absorbing heat, the water is discharged in the form of water vapor together with other exhaust gases. Under the theoretical calculation of equivalent ratio combustion, the water vapor in the exhaust of hydrogen engines accounts for 25% to 30%. A large amount of water vapor in the exhaust is cooled by the exhaust gas recirculation system and condensed into liquid water. A large amount of liquid water accumulates at the intercooler or flows into the intake pipe, which will seriously affect the normal operation of the engine. Summary of the invention

[0003] Based on this, it is necessary to provide an exhaust gas recirculation system and an exhaust gas recirculation control method to address the above technical problems, which can prevent liquid water from accumulating in the intercooler or flowing into the intake pipe, thereby ensuring the normal operation of the engine.

[0004] In a first aspect, the present application provides an exhaust gas recirculation system, the system comprising: a control unit, an engine, an exhaust gas recirculation valve, an intercooler, a water storage tank, an intake pipe and an exhaust pipe;

[0005] The engine is connected to an intake pipe and an exhaust pipe respectively; the intake pipe is used to input hydrogen and outside air into the engine, and the hydrogen and outside air are used to carry out chemical reactions in the engine; the exhaust pipe is used to output the gas exhausted by the engine;

[0006] The intercooler includes an inlet end and an outlet end; the exhaust gas recirculation valve is located between the exhaust pipe and the inlet end of the intercooler; the intercooler includes a circulating cooling water channel and an exhaust gas channel that are independent of each other; the circulating cooling water channel is used to cool the gas passing through the exhaust gas channel; the outlet end of the intercooler is connected to the water reservoir; an exhaust port is provided on the side of the water reservoir at a preset height from the bottom of the water reservoir; the exhaust port and the outlet end of the intercooler are both connected to the intake pipe;

[0007] The control unit is used to control the exhaust gas recirculation valve to open after receiving the exhaust gas recirculation command, so that the gas discharged from the engine through the exhaust pipe flows through the exhaust gas recirculation valve to reach the exhaust gas channel, the waste water flowing out of the exhaust gas channel flows into the water tank, and the exhaust gas flowing out of the exhaust gas channel flows into the engine through the outlet end, the exhaust port of the water tank and the intake pipe.

[0008] In one of the embodiments, the system further comprises a collector;

[0009] The water reservoir includes an aqueous solution having a preset liquid level height;

[0010] The collector comprises a collecting channel; one end of the collecting channel is connected to the exhaust gas channel; and the other end of the collecting channel is inserted below the liquid surface of the aqueous solution.

[0011] In one embodiment, the system further includes a solenoid valve, an in-cylinder water injector, and an intake duct water injector;

[0012] The solenoid valve comprises a water inlet end, a first water outlet end and a second water outlet end;

[0013] The water inlet end is connected with the water storage tank;

[0014] The first water outlet is connected to the water ejector in the cylinder;

[0015] The second water outlet is connected to the air intake pipe water injector.

[0016] In one of the embodiments, the system further comprises a pressurized water pump;

[0017] The pressurized water pump is located between the water reservoir and the water inlet end, and is used to pressurize the aqueous solution flowing out of the water reservoir.

[0018] In one of the embodiments, the system further comprises a filter;

[0019] The filter is located between the water reservoir and the pressure water pump, and is used for filtering the aqueous solution flowing out of the water reservoir.

[0020] In one of the embodiments, the system further comprises a venturi;

[0021] The venturi tube includes an outlet conduit, a first inlet conduit, and a second inlet conduit;

[0022] The first inlet pipe is connected to the outlet end of the intercooler;

[0023] The second inlet pipe is connected to the exhaust port;

[0024] The outlet pipe is connected to the intake pipe.

[0025] In one embodiment, the intake conduit further includes an intake manifold and an exhaust gas intake conduit;

[0026] The intake manifold includes a first input end, a second input end, and an output end;

[0027] The output end is connected with the engine;

[0028] The first input end is used to input external air into the engine through the intake manifold;

[0029] The second input end is connected to the outlet pipe through the exhaust gas intake pipe, and is used for inputting the exhaust gas discharged from the outlet pipe into the engine through the intake manifold.

[0030] In one embodiment, the system further comprises a hydrogen injector and a spark plug; the intake duct further comprises an intake mixing chamber;

[0031] The hydrogen injector is arranged inside the intake mixing chamber and is used for injecting hydrogen into the intake mixing chamber;

[0032] The intake mixing chamber is located between the intake pipe and the engine, and is used to mix the hydrogen in the intake mixing chamber, the outside air and the exhaust gas, and input the formed mixed gas into the engine;

[0033] The spark plug is located inside the engine;

[0034] The control unit is also used to control the ignition of the spark plug after receiving the ignition command, so that the mixed gas can undergo a chemical reaction in the engine.

[0035] In one embodiment, the exhaust conduit further includes an exhaust manifold, an exhaust header, and an exhaust gas exhaust conduit;

[0036] The exhaust manifold and the exhaust gas exhaust pipe are both connected to the exhaust main pipe, and the exhaust gas exhaust pipe is located between the exhaust main pipe and the exhaust gas recirculation valve;

[0037] After receiving the exhaust gas recirculation instruction, the control unit controls the exhaust gas recirculation valve to open, so that the gas exhausted by the engine through the exhaust manifold flows through the exhaust gas exhaust pipe and the exhaust gas recirculation valve in sequence to reach the exhaust gas channel, the waste water flowing out of the exhaust gas channel flows into the water reservoir, and the exhaust gas flowing out of the exhaust gas channel flows into the engine through the outlet end, the exhaust port of the water reservoir and the intake pipe;

[0038] After receiving the command to stop exhaust gas recirculation, the control unit controls the exhaust gas recirculation valve to close, so that the gas exhausted by the engine through the exhaust main pipe flows through the exhaust manifold and is discharged to the outside.

[0039] In a second aspect, the present application also provides an exhaust gas recirculation control method, which is applied to an exhaust gas recirculation system, and the method includes:

[0040] After receiving the exhaust gas recirculation command, the exhaust gas recirculation valve is controlled to open, so that the gas discharged from the engine through the exhaust pipe flows through the exhaust gas recirculation valve to reach the exhaust gas channel, and the waste water flowing out of the exhaust gas channel flows into the water reservoir. The exhaust gas flowing out of the exhaust gas channel flows into the engine through the outlet end of the intercooler, the exhaust port of the water reservoir and the intake pipe.

[0041] The above-mentioned exhaust gas recirculation system and exhaust gas recirculation control method, the system includes: a control unit, an engine, an exhaust gas recirculation valve, an intercooler, a water reservoir, an intake pipe and an exhaust pipe. The engine is connected to the intake pipe and the exhaust pipe respectively, and hydrogen and external air react chemically in the engine and are discharged through the exhaust pipe. Since the exhaust gas recirculation valve is located between the exhaust pipe and the inlet end of the intercooler, after the control unit receives the exhaust gas recirculation instruction, it controls the exhaust gas recirculation valve to open, and the gas discharged from the exhaust pipe will reach the intercooler. The intercooler includes independent circulating cooling water channels and exhaust gas channels. The circulating cooling water channel cools the gas passing through the exhaust gas channel, condenses it into liquid water, and flows into the water reservoir through the outlet end, which can prevent liquid water from accumulating at the intercooler and flowing into the intake pipe, thereby ensuring the normal operation of the engine. At the same time, an exhaust port is provided on the side of the water tank at a preset height from the bottom of the water tank. The exhaust port and the outlet end of the intercooler are both connected to the intake pipe, which can ensure that the exhaust gas flowing out of the exhaust gas channel flows into the engine through the outlet end of the intercooler and the exhaust port of the water tank respectively, which is beneficial to the recycling of exhaust gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 A schematic diagram of the structure of an exhaust gas recirculation system in one embodiment;

[0044] Figure 2 is a schematic flow chart of an exhaust gas recirculation control method in one embodiment;

[0045] Figure 3 is a structural block diagram of an exhaust gas recirculation control device in one embodiment;

[0046] Figure 4 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0047] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0048] In some embodiments, see Figure 1 , the exhaust gas recirculation system includes: a control unit 22, an engine 21, an exhaust gas recirculation valve 6, an intercooler 7, a water storage tank 11, an intake pipe and an exhaust pipe;

[0049] The engine 21 is connected to an intake pipe and an exhaust pipe respectively; the intake pipe is used to input hydrogen and outside air into the engine 21, and the hydrogen and outside air are used to perform chemical reactions in the engine 21; the exhaust pipe is used to output the gas exhausted by the engine 21;

[0050] The intercooler 7 includes an inlet end and an outlet end; the exhaust gas recirculation valve 6 is located between the exhaust pipe and the inlet end of the intercooler 7; the intercooler 7 includes a circulating cooling water channel and an exhaust gas channel that are independent of each other; the circulating cooling water channel is used to cool the gas passing through the exhaust gas channel; the outlet end of the intercooler 7 is connected to the water reservoir 11; an exhaust port 10 is provided on the side of the water reservoir 11 and at a preset height from the bottom of the water reservoir 11; the exhaust port 10 and the outlet end of the intercooler 7 are both connected to the intake pipe;

[0051] The control unit 22 is used to control the exhaust gas recirculation valve 6 to open after receiving the exhaust gas recirculation instruction, so that the gas exhausted by the engine 21 through the exhaust pipe flows through the exhaust gas recirculation valve 6 to reach the exhaust gas channel, and the waste water flowing out of the exhaust gas channel flows into the water tank 11. The exhaust gas flowing out of the exhaust gas channel flows into the engine 21 through the outlet end, the exhaust port 10 of the water tank 11 and the intake pipe.

[0052] Among them, the control unit can be an ECU (Electronic Control Unit). The engine 21 can be a hydrogen engine 21. The engine 21 includes an air inlet and an air outlet, the engine 21 and the air inlet are connected to the air inlet pipe, and the air outlet of the engine 21 is connected to the air outlet pipe. Hydrogen and outside air are input into the engine 21 from the air inlet through the air inlet pipe. In some embodiments, the system also includes a hydrogen injector and a compressor 1, hydrogen is injected by the hydrogen injector, and is input into the engine 21 through the air inlet pipe. The compressor 1 sends the outside air into the air inlet pipe and inputs it into the engine 21.

[0053] Hydrogen and oxygen in the outside air undergo a chemical reaction by combustion in the engine 21 to generate water. Under the high temperature environment in the engine 21, water exists in the engine 21 in the form of water vapor. The exhaust pipe outputs the gas exhausted by the engine 21, and the exhausted gas components include water vapor, nitrogen, unreacted hydrogen, etc.

[0054] The control unit 22 can control the exhaust gas recirculation valve 6 to open or close. For example, after receiving the exhaust gas recirculation instruction, the control unit 22 controls the exhaust gas recirculation valve 6 to open. When the exhaust gas recirculation valve 6 is opened, a passage is formed between the exhaust pipe and the intercooler 7, and the gas output by the engine 21 enters the exhaust gas passage of the intercooler 7.

[0055] Since the circulating cooling water channel and the exhaust gas channel in the intercooler 7 are independent of each other and not interconnected, the circulating cooling water channel can exchange heat with the gas in the exhaust gas channel, thereby cooling and liquefying the water vapor in the exhaust gas channel and condensing it into liquid water.

[0056] The outlet end of the intercooler 7 is connected to the water reservoir 11, and the condensed liquid water flows into the water reservoir 11 to collect the liquid water, thereby preventing the liquid water from accumulating in the intercooler 7 or flowing into the intake passage.

[0057] An exhaust port 10 is provided on the side of the water reservoir 11 at a preset height from the bottom of the water reservoir 11 to ensure that the gas in the water reservoir 11 is discharged from the exhaust port 10 along with the liquid water to avoid excessive pressure in the water reservoir 11.

[0058] The exhaust port 10 of the water tank 11 and the outlet end of the intercooler 7 are both connected to the intake pipe, so that the exhaust gas flowing out of the exhaust gas channel passes through the exhaust port 10 of the water tank 11 and the outlet end of the intercooler 7 respectively, and flows into the engine 21 through the intake pipe, thereby realizing the recycling of exhaust gas, saving energy consumption, and reducing exhaust gas emissions.

[0059] The above-mentioned exhaust gas recirculation system includes: a control unit, an engine, an exhaust gas recirculation valve, an intercooler, a water reservoir, an intake pipe and an exhaust pipe. The engine is connected to the intake pipe and the exhaust pipe respectively. After the hydrogen and the outside air undergo a chemical reaction in the engine, they are discharged through the exhaust pipe. Since the exhaust gas recirculation valve is located between the exhaust pipe and the inlet end of the intercooler, after the control unit receives the exhaust gas recirculation instruction, it controls the exhaust gas recirculation valve to open, and the gas discharged from the exhaust pipe will reach the intercooler. The intercooler includes independent circulating cooling water channels and exhaust gas channels. The circulating cooling water channel cools the gas passing through the exhaust gas channel, condenses it into liquid water, and flows into the water reservoir through the outlet end, which can prevent the liquid water from gathering at the intercooler and flowing into the intake pipe, thereby ensuring the normal operation of the engine. At the same time, an exhaust port is provided on the side of the water tank at a preset height from the bottom of the water tank. The exhaust port and the outlet end of the intercooler are both connected to the intake pipe, which can ensure that the exhaust gas flowing out of the exhaust gas channel flows into the engine through the outlet end of the intercooler and the exhaust port of the water tank respectively, which is beneficial to the recycling of exhaust gas.

[0060] In one embodiment, see Figure 1The system also includes a collector 12; the water reservoir 11 includes an aqueous solution with a preset liquid level; the collector 12 includes a collecting channel; one end of the collecting channel is connected to the exhaust gas channel; the other end of the collecting channel is deep below the liquid level of the aqueous solution.

[0061] One end of the collecting channel in the collector 12 is connected to the exhaust gas channel, and the other end is inserted below the liquid level of the aqueous solution in the water reservoir 11. A water outlet is provided at the bottom of the collector 12, and the wastewater flowing out of the exhaust gas channel enters the water reservoir 11 through the collecting channel and the water outlet, and the wastewater and the aqueous solution in the water reservoir 11 are combined to realize the collection of exhaust gas.

[0062] In this embodiment, the collecting channel in the collector penetrates below the liquid level of the aqueous solution in the water reservoir, which can ensure that the wastewater in the waste gas channel flows into the water reservoir, and the waste gas components that can be dissolved in the aqueous solution in the water reservoir are filtered, and the waste gas components that cannot be dissolved in the aqueous solution in the water reservoir are discharged from the exhaust port 10 of the water reservoir.

[0063] In one embodiment, see Figure 1 The system further includes a solenoid valve 15 and a water injector 17. The water injector 17 includes an in-cylinder water injector and an intake pipe water injector. The solenoid valve 15 includes a water inlet end, a first water outlet end and a second water outlet end; the water inlet end is connected to the water reservoir 11; the first water outlet end is connected to the in-cylinder water injector; and the second water outlet end is connected to the intake pipe water injector.

[0064] The control unit 22 can respectively control the water inlet, the first water outlet or the second water outlet of the solenoid valve 15. For example, the control unit 22 controls the water inlet pipe and the first water outlet to be opened. When the water inlet pipe and the first water outlet are opened, the aqueous solution in the water reservoir 11 is output to the in-cylinder water ejector, thereby providing the in-cylinder water ejector with the aqueous solution for spraying water.

[0065] For another example, the control unit 22 controls the water inlet pipe and the second water outlet to open. When the water inlet pipe and the second water outlet are opened, the aqueous solution in the water reservoir 11 is output to the intake pipe water injector, thereby providing the intake pipe water injector with the aqueous solution for spraying.

[0066] Since hydrogen is easily burned in the engine 21, premature combustion, flashback and knock are likely to occur. Spraying water through the in-cylinder water injector and the intake pipe water injector can effectively reduce the heat load in the cylinder and lower the temperature, thereby solving the problems of premature combustion and flashback. Currently, water spraying technology mostly exists in gasoline engines, diesel engines or natural gas engines 21, and all of them require additional water to be added regularly, which limits the working flexibility.

[0067] In this embodiment, the condensed water is extracted, collected, stored, filtered, pressurized and sprayed by making use of the moisture in the combustion products of the hydrogen engine itself and the condensation effect of the exhaust gas recirculation intercooler, thereby providing a water source for the intake duct and the in-cylinder water injection system, realizing flexible recycling, eliminating the need for additional water sources and saving resources.

[0068] In one embodiment, see Figure 1 The system also includes a pressurized water pump 14; the pressurized water pump 14 is located between the water reservoir 11 and the water inlet end, and is used to pressurize the aqueous solution flowing out of the water reservoir 11.

[0069] In this embodiment, the pressurized water pump 14 can pressurize the aqueous solution flowing out of the water reservoir 11 to ensure that the aqueous solution in the water reservoir 11 can smoothly flow to the water inlet end of the solenoid valve 15 .

[0070] In one embodiment, see Figure 1 The system also includes a filter 13 ; the filter 13 is located between the water reservoir 11 and the pressurized water pump 14 , and is used to filter the aqueous solution flowing out of the water reservoir 11 .

[0071] In this embodiment, the filter can filter the aqueous solution flowing out of the water storage tank to remove impurities, thereby ensuring that the water ejector ejects a relatively pure aqueous solution.

[0072] In one embodiment, see Figure 1 The system also includes a venturi tube 8; the venturi tube 8 includes an outlet pipe, a first inlet pipe and a second inlet pipe; the first inlet pipe is connected to the outlet end of the intercooler 7; the second inlet pipe is connected to the exhaust port 10; and the outlet pipe is connected to the intake pipe.

[0073] Among them, most of the exhaust gas in the intercooler 7 flows to the venturi tube 8 through the outlet end after being cooled.

[0074] Only a small amount of exhaust gas flows from the collector 12 into the water reservoir 11 . After the condensed water is filtered out from the aqueous solution in the water reservoir 11 , the exhaust gas flows to the venturi tube 8 through the exhaust port 10 .

[0075] The exhaust gas output from the outlet end of the intercooler 7 and the exhaust gas input from the exhaust port 10 of the water storage tank 11 are mixed in the venturi tube 8 .

[0076] In some embodiments, see Figure 1 The second inlet pipe is located at the throat of the venturi tube 8.

[0077] In this embodiment, due to the characteristics of the Venturi tube, the flow velocity at the throat is high and the pressure is low. By designing a reasonable throat size, it can be ensured that the exhaust gas flowing out of the exhaust port is sucked into the Venturi tube, thereby being evenly mixed with the high-pressure exhaust gas output from the outlet end of the intercooler 7 and finally flowing into the intake pipe.

[0078] In one embodiment, see Figure 1 The intake pipe also includes an intake manifold 18 and an exhaust gas intake pipe 9; the intake manifold 18 includes a first input end, a second input end and an output end; the output end is connected to the engine 21; the first input end is used to input the outside air into the engine 21 through the intake manifold 18; the second input end is connected to the outlet pipe through the exhaust gas intake pipe 9, and is used to input the exhaust gas discharged from the outlet pipe into the engine 21 through the intake manifold 18.

[0079] The outside air is input into the engine 21 through the first input end of the intake manifold 18 , the exhaust gas discharged from the outlet pipe is input into the engine 21 through the second input end of the intake manifold 18 , and finally input into the engine 21 through the output end of the intake manifold 18 .

[0080] In this embodiment, not only can external air be introduced into the engine to participate in the reaction, but the exhaust gas after combustion can also be further involved in the reaction, thereby improving fuel utilization.

[0081] In one embodiment, see Figure 1 The system also includes a hydrogen injector 20 and a spark plug 16; the intake pipe also includes an intake mixing chamber 19; the hydrogen injector 20 is deployed inside the intake mixing chamber 19, and is used to inject hydrogen into the intake mixing chamber 19; the intake mixing chamber 19 is located between the intake pipe and the engine 21, and is used to mix the hydrogen in the intake mixing chamber 19, the outside air and the exhaust gas, and input the formed mixed gas into the engine 21; the spark plug 16 is located inside the engine 21; the control unit 22 is also used to control the spark plug 16 to ignite after receiving the ignition command, so that the mixed gas can undergo a chemical reaction in the engine 21.

[0082] The hydrogen injector 20 injects hydrogen into the intake mixing chamber 19. At the same time, the outside air and the exhaust gas also enter the intake mixing chamber 19. The hydrogen, the outside air and the exhaust gas are mixed in the intake mixing chamber 19 to form a mixed gas. After the mixed gas is input into the engine 21, the spark plug 16 is ignited to cause the combustion of the hydrogen.

[0083] In this embodiment, hydrogen, outside air and exhaust gas are mixed in the intake mixing chamber and then enter the engine. Through the ignition of the spark plug, hydrogen is burned as fuel. At the same time, the hydrogen component or oxygen component in the exhaust gas can further participate in the combustion, thereby improving the utilization rate of the fuel.

[0084] In one embodiment, see Figure 1 The exhaust pipe also includes an exhaust manifold 3, an exhaust main pipe 4 and an exhaust gas exhaust pipe 5; the exhaust manifold 3 and the exhaust gas exhaust pipe 5 are both connected to the exhaust main pipe 4, and the exhaust gas exhaust pipe 5 is located between the exhaust main pipe 4 and the exhaust gas recirculation valve 6; after receiving the exhaust gas recirculation instruction, the control unit 22 controls the exhaust gas recirculation valve 6 to open, so that the gas exhausted by the engine 21 through the exhaust main pipe 4 flows through the exhaust gas exhaust pipe 5 and the exhaust gas recirculation valve 6 in sequence to reach the exhaust gas channel, the waste water flowing out of the exhaust gas channel flows into the water storage tank 11, and the exhaust gas flowing out of the exhaust gas channel flows into the engine 21 through the outlet end, the exhaust port 10 of the water storage tank 11 and the intake pipe; after receiving the exhaust gas recirculation stop instruction, the control unit 22 controls the exhaust gas recirculation valve 6 to close, so that the gas exhausted by the engine 21 through the exhaust main pipe 4 flows through the exhaust manifold 3 and is discharged to the outside.

[0085] Among them, the control unit 22 can control the switch of the exhaust gas recirculation valve 6. When the exhaust gas recirculation valve 6 is opened, the gas output from the engine 21 will enter the recirculation stage, and will be cooled, filtered and recovered in turn, and finally re-enter the engine 21 to realize exhaust gas recirculation, thereby improving fuel utilization.

[0086] When the exhaust gas recirculation valve 6 is closed, the exhaust gas recirculation is not performed. In some embodiments, the system further comprises a turbine 2, and the gas outputted by the engine 21 passes through the exhaust manifold 3, enters the turbine 2, and is then discharged to the outside.

[0087] In this embodiment, the on-off control of the exhaust gas recirculation valve is performed to control the on-off of the exhaust gas recirculation, which is beneficial to the recycling of the exhaust gas and improves the fuel utilization rate.

[0088] In one embodiment, Figure 2 As shown, an exhaust gas recirculation control method is provided, the method is applied to an exhaust gas recirculation system, and the method includes:

[0089] Step 202: Receive an exhaust gas recirculation instruction.

[0090] Step 204, after receiving the exhaust gas recirculation instruction, control the exhaust gas recirculation valve to open, so that the gas exhausted by the engine through the exhaust pipe flows through the exhaust gas recirculation valve to reach the exhaust gas channel, the waste water flowing out of the exhaust gas channel flows into the water storage tank, and the exhaust gas flowing out of the exhaust gas channel flows into the engine through the outlet end of the intercooler, the exhaust port of the water storage tank and the intake pipe.

[0091] In the above-mentioned exhaust gas recirculation control method, since the exhaust gas recirculation valve is located between the exhaust pipe and the inlet end of the intercooler, after the control unit receives the exhaust gas recirculation instruction, it controls the exhaust gas recirculation valve to open, and the gas discharged from the exhaust pipe will reach the intercooler. The intercooler includes a circulating cooling water channel and an exhaust gas channel that are independent of each other. The circulating cooling water channel cools the gas passing through the exhaust gas channel, condenses it into liquid water, and flows into the water reservoir through the outlet end, which can prevent the liquid water from accumulating at the intercooler and flowing into the intake pipe, thereby ensuring the normal operation of the engine. At the same time, an exhaust port is provided on the side of the water reservoir at a preset height from the bottom of the water reservoir. The exhaust port and the outlet end of the intercooler are both connected to the intake pipe, which can ensure that the exhaust gas flowing out of the exhaust gas channel flows into the engine through the outlet end of the intercooler and the exhaust port of the water reservoir, respectively, which is conducive to the recycling of exhaust gas.

[0092] In one embodiment, the exhaust gas recirculation control method further includes: after receiving the exhaust gas recirculation instruction, controlling the exhaust gas recirculation valve to open, so that the gas exhausted by the engine through the exhaust manifold flows through the exhaust gas exhaust pipe and the exhaust gas recirculation valve in sequence to reach the exhaust gas channel, the waste water flowing out of the exhaust gas channel flows into the water storage tank, and the exhaust gas flowing out of the exhaust gas channel flows into the engine through the outlet end, the exhaust port of the water storage tank and the intake pipe;

[0093] After receiving the command to stop exhaust gas recirculation, the exhaust gas recirculation valve is controlled to close, so that the gas exhausted by the engine through the exhaust main pipe flows through the exhaust manifold and is discharged to the outside.

[0094] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0095] Based on the same inventive concept, the embodiment of the present application also provides an exhaust gas recirculation control device for implementing the exhaust gas recirculation control method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more embodiments of the exhaust gas recirculation control device provided below can refer to the limitations of the exhaust gas recirculation control method above, and will not be repeated here.

[0096] In an exemplary embodiment, Figure 3 As shown, an exhaust gas recirculation control device 300 is provided, which is applied to an exhaust gas recirculation system. The device includes: a receiving module 320 and a control module 340, wherein:

[0097] The receiving module 320 is used to receive an exhaust gas recirculation instruction.

[0098] The control module 340 is used to control the exhaust gas recirculation valve to open after receiving the exhaust gas recirculation instruction, so that the gas discharged from the engine through the exhaust pipe flows through the exhaust gas recirculation valve to reach the exhaust gas channel, and the waste water flowing out of the exhaust gas channel flows into the water storage tank. The exhaust gas flowing out of the exhaust gas channel flows into the engine through the outlet end of the intercooler, the exhaust port of the water storage tank and the intake pipe.

[0099] The exhaust gas recirculation system control device is configured such that the exhaust gas recirculation valve is located between the exhaust pipe and the inlet end of the intercooler. Therefore, after receiving the exhaust gas recirculation instruction, the control unit controls the exhaust gas recirculation valve to open, and the gas discharged from the exhaust pipe will reach the intercooler. The intercooler includes a circulating cooling water channel and an exhaust gas channel that are independent of each other. The circulating cooling water channel cools the gas passing through the exhaust gas channel, condenses it into liquid water, and flows into the water reservoir through the outlet end, which can prevent the liquid water from accumulating at the intercooler and flowing into the intake pipe, thereby ensuring the normal operation of the engine. At the same time, an exhaust port is provided on the side of the water reservoir at a preset height from the bottom of the water reservoir. The exhaust port and the outlet end of the intercooler are both connected to the intake pipe, which can ensure that the exhaust gas flowing out of the exhaust gas channel flows into the engine through the outlet end of the intercooler and the exhaust port of the water reservoir, respectively, which is conducive to the recycling of exhaust gas.

[0100] In one embodiment, the control module 340 is also used for: after receiving an exhaust gas recirculation instruction, controlling the exhaust gas recirculation valve to open, so that the gas exhausted by the engine through the exhaust manifold flows through the exhaust gas exhaust pipe and the exhaust gas recirculation valve in sequence to reach the exhaust channel, the waste water flowing out of the exhaust channel flows into the water reservoir, and the exhaust gas flowing out of the exhaust channel flows into the engine through the outlet end, the exhaust port of the water reservoir and the intake pipe; after receiving an exhaust gas recirculation stop instruction, controlling the exhaust gas recirculation valve to close, so that the gas exhausted by the engine through the exhaust manifold flows through the exhaust manifold and is discharged to the outside.

[0101] Each module in the exhaust gas recirculation system control device can be implemented in whole or in part by software, hardware, or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute operations corresponding to each module.

[0102] In an exemplary embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as shown in FIG. Figure 4 As shown. The computer device includes a processor, a memory, an input / output interface, a communication interface, a display unit and an input device. The processor, the memory and the input / output interface are connected via a system bus, and the communication interface, the display unit and the input device are connected to the system bus via the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be implemented through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. When the computer program is executed by the processor, a method for controlling an exhaust gas recirculation system is implemented.

[0103] Those skilled in the art will understand that Figure 4 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0104] In an exemplary embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above-mentioned method embodiments when executing the computer program.

[0105] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0106] In one embodiment, a computer program product is provided, including a computer program, which implements the steps in the above method embodiments when executed by a processor.

[0107] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0108] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0109] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0110] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. An exhaust gas recirculation system, characterized in that: The system comprises: a control unit, an engine, an exhaust gas recirculation valve, an intercooler, a water reservoir, an intake pipe and an exhaust pipe; The engine is connected to the intake pipe and the exhaust pipe respectively; the intake pipe is used to input hydrogen and outside air into the engine, and the hydrogen and the outside air are used to perform chemical reactions in the engine; the exhaust pipe is used to output the gas exhausted by the engine; The intercooler comprises an inlet end and an outlet end; the exhaust gas recirculation valve is located between the exhaust pipe and the inlet end of the intercooler; the intercooler comprises a circulating cooling water channel and an exhaust gas channel which are independent of each other; the circulating cooling water channel is used to cool the gas passing through the exhaust gas channel; the outlet end of the intercooler is connected to the water reservoir; an exhaust port is provided on the side of the water reservoir at a preset height from the bottom of the water reservoir; the exhaust port and the outlet end of the intercooler are both connected to the intake pipe; The control unit is used to control the exhaust gas recirculation valve to open after receiving the exhaust gas recirculation instruction, so that the gas exhausted by the engine through the exhaust pipe flows through the exhaust gas recirculation valve to reach the exhaust gas channel, the waste water flowing out of the exhaust gas channel flows into the water reservoir, and the exhaust gas flowing out of the exhaust gas channel flows into the engine through the outlet end, the exhaust port of the water reservoir and the intake pipe; The system also includes a collector; The water reservoir includes an aqueous solution having a preset liquid level; The collector comprises a collecting channel; one end of the collecting channel is connected to the exhaust gas channel; the other end of the collecting channel is inserted below the liquid surface of the aqueous solution; a water outlet is provided at the bottom of the collector, and the wastewater flowing out of the exhaust gas channel enters the water reservoir through the collecting channel and the water outlet; The system also includes a venturi; The venturi tube includes an outlet pipe, a first inlet pipe and a second inlet pipe; The first inlet pipe is connected to the outlet end of the intercooler; The second inlet pipe is connected to the exhaust port; the second inlet pipe is located at the throat of the venturi tube; The outlet pipe is connected to the intake pipe.

2. The system according to claim 1, characterized in that The system also includes a solenoid valve, an in-cylinder water injector, and an intake pipe water injector; The solenoid valve comprises a water inlet end, a first water outlet end and a second water outlet end; The water inlet end is connected to the water reservoir; The first water outlet is connected to the in-cylinder water ejector; The second water outlet is connected to the air intake pipe water injector.

3. The system according to claim 2, characterized in that The system also includes a pressurized water pump; The pressurized water pump is located between the water reservoir and the water inlet end, and is used to pressurize the aqueous solution flowing out of the water reservoir.

4. The system according to claim 3, characterized in that The system also includes a filter; The filter is located between the water reservoir and the pressurized water pump, and is used for filtering the aqueous solution flowing out of the water reservoir.

5. The system according to claim 1, characterized in that The intake duct also includes an intake manifold and an exhaust gas intake duct; The intake manifold includes a first input end, a second input end, and an output end; The output end is connected to the engine; The first input end is used to input external air into the engine through the intake manifold; The second input end is connected to the outlet pipe through the exhaust gas intake pipe, and is used for inputting the exhaust gas discharged from the outlet pipe into the engine through the intake manifold.

6. The system according to claim 1, characterized in that The system also includes a hydrogen injector and a spark plug; the intake duct also includes an intake mixing chamber; The hydrogen injector is disposed inside the intake mixing chamber and is used to inject hydrogen into the intake mixing chamber; The intake mixing chamber is located between the intake pipe and the engine, and is used to mix the hydrogen in the intake mixing chamber, the outside air and the exhaust gas, and input the formed mixed gas into the engine; The spark plug is located inside the engine; The control unit is also used to control the spark plug to ignite after receiving an ignition command, so that the mixed gas can undergo a chemical reaction in the engine.

7. The system according to claim 1, characterized in that The exhaust pipe also includes an exhaust manifold, an exhaust header and an exhaust gas exhaust pipe; The exhaust manifold and the exhaust gas exhaust pipe are both connected to the exhaust main pipe, and the exhaust gas exhaust pipe is located between the exhaust main pipe and the exhaust gas recirculation valve; After receiving the exhaust gas recirculation instruction, the control unit controls the exhaust gas recirculation valve to open, so that the gas exhausted by the engine through the exhaust manifold flows through the exhaust gas exhaust pipe and the exhaust gas recirculation valve in sequence to reach the exhaust gas channel, the waste water flowing out of the exhaust gas channel flows into the water reservoir, and the exhaust gas flowing out of the exhaust gas channel flows into the engine through the outlet end, the exhaust port of the water reservoir and the intake pipe; After receiving the instruction to stop exhaust gas recirculation, the control unit controls the exhaust gas recirculation valve to close, so that the gas exhausted by the engine through the exhaust main pipe flows through the exhaust manifold and is discharged to the outside.

8. An exhaust gas recirculation control method, characterized in that: The method is applied to the exhaust gas recirculation system according to any one of claims 1 to 7, and the method comprises: After receiving the exhaust gas recirculation command, the exhaust gas recirculation valve is controlled to open, so that the gas exhausted by the engine through the exhaust pipe flows through the exhaust gas recirculation valve to reach the exhaust gas channel, and the waste water flowing out of the exhaust gas channel flows into the water reservoir, and the exhaust gas flowing out of the exhaust gas channel flows into the engine through the outlet end of the intercooler, the exhaust port of the water reservoir and the intake pipe.

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