Engine exhaust system, control method, device and vehicle

Abstract

The present invention discloses an exhaust system, control method, device and vehicle of an engine. In the exhaust system of the engine, the engine includes at least one cylinder and a supercharger, and the cylinder includes an exhaust valve; the exhaust system includes an exhaust valve, an exhaust duct, an exhaust manifold, an exhaust bypass pipe and an air guide valve; the exhaust duct is located between the exhaust valve and the air guide valve, one end of the exhaust duct is connected to the exhaust valve, and the other end is connected to the intake end of the air guide valve; the air guide valve is used to connect the first outlet end or the second outlet end by changing the action, the first outlet end is connected to the exhaust bypass pipe, and the second outlet end is connected to the exhaust manifold; the exhaust manifold is connected to the supercharger. Through the exhaust system and its control of the present invention, the action of the air guide valve is changed to control whether the supercharger participates in the exhaust, which can take into account the advantages of the turbocharged engine utilizing the exhaust energy and the low back pressure and low residual exhaust gas of the naturally aspirated engine.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and in particular to an exhaust system, a control method, a device and a vehicle of an engine. Background Art

[0002] The engine power density can be increased by using a boost device (such as a turbocharger). However, as engine vehicles become a means of transportation that is frequently used, multi-purpose, and has a wide range of uses by the public, the demand for engine vehicles to provide a variety of power is increasing.

[0003] At present, compared with naturally aspirated engines, turbocharged engines can utilize exhaust energy and increase thermal efficiency, but due to turbine obstruction, high exhaust back pressure, and a lot of residual exhaust gas in the cylinder, combustion deteriorates and pumping loss increases. When the ignition interval of a multi-cylinder engine is less than the exhaust wrap angle, exhaust interference will occur, resulting in reduced torque. In addition, during cold start, the exhaust flows through the turbine and is affected by the heat dissipation of the turbine, resulting in low temperature in front of the catalyst. Summary of the invention

[0004] The present invention provides an engine exhaust system, control method, device and vehicle. By changing the action of an air guide valve to control whether a supercharger participates in exhaust, the advantages of a turbocharged engine in utilizing exhaust energy and a naturally aspirated engine in having low back pressure and low residual exhaust gas can be taken into account, thereby utilizing exhaust energy.

[0005] According to one aspect of the present invention, there is provided an exhaust system of an engine, the engine comprising at least one cylinder and a supercharger, the cylinder comprising an exhaust valve;

[0006] The exhaust system includes an exhaust valve, an exhaust duct, an exhaust manifold, an exhaust bypass pipe and an air guide valve;

[0007] The exhaust duct is located between the exhaust valve and the air guide valve, with one end of the exhaust duct connected to the exhaust valve and the other end connected to the intake end of the air guide valve;

[0008] The air guide valve is used to connect the first air outlet end or the second air outlet end by changing the action, the first air outlet end is connected to the exhaust bypass pipe, and the second air outlet end is connected to the exhaust manifold;

[0009] The exhaust manifold is connected to the supercharger.

[0010] Optionally, the exhaust system specifically further includes:

[0011] merges into the airway;

[0012] The air intake duct is located between the exhaust duct and the air guide valve, with one end connected to the exhaust duct and the other end connected to the air intake end of the air guide valve.

[0013] Optionally, the exhaust system specifically further includes:

[0014] Catalyst;

[0015] The air inlet end of the catalyst is connected to the outlet end of the supercharger and the air outlet end of the exhaust bypass pipe respectively.

[0016] According to another aspect of the present invention, a control method for an exhaust system is provided, which is applicable to any of the above exhaust systems and specifically includes:

[0017] Get engine signal;

[0018] Determine the engine working status according to the engine signal;

[0019] Determine the current working mode according to the working state of the engine;

[0020] Adjust the exhaust path according to the current working mode;

[0021] The engine signals include engine speed signal, load signal and crankshaft angle signal.

[0022] Optionally, judging the engine operating state according to the engine signal includes:

[0023] If the load signal is less than a first preset load value and / or the engine speed signal is less than a first preset speed value, the engine operating state is determined to be a first state and a first operating mode;

[0024] Adjust the exhaust path according to the current working mode, including:

[0025] The first working mode keeps the air guide valve connected to the first air outlet end so that the exhaust passage is connected to the exhaust bypass pipe.

[0026] Optionally, judging the engine working state according to the engine signal specifically also includes:

[0027] If the load signal is greater than a second preset load value and / or the engine speed signal is greater than a second preset speed value, the engine operating state is determined to be the second state and the second operating mode is determined;

[0028] Adjust the exhaust path according to the current working mode, including:

[0029] The second working mode keeps the air guide valve connected to the second air outlet end so that the exhaust passage is connected to the exhaust manifold.

[0030] The first speed preset value is smaller than the second speed preset value, and the first load preset value is smaller than the second load preset value.

[0031] Optionally, judging the engine working state according to the engine signal specifically also includes:

[0032] If the load signal is neither less than the first preset load value nor greater than the second preset load value and / or the engine speed signal is neither less than the first preset speed value nor greater than the second preset speed value, the engine operating state is determined to be the third state and the third operating mode;

[0033] Adjust the exhaust path according to the current working mode, including:

[0034] The third working mode determines the action time of the air guide valve according to the engine speed, load signal and crankshaft angle, controls the air guide valve to connect to the first outlet port, connects the exhaust passage to the exhaust bypass pipe or connects to the second outlet port, connects the exhaust passage to the exhaust manifold;

[0035] The first speed preset value is smaller than the second speed preset value, and the first load preset value is smaller than the second load preset value.

[0036] Optionally, the engine includes at least two cylinders and the control method specifically further includes:

[0037] According to the current engine speed and load signal, a preset control map is searched to obtain a first speed preset value and / or a second speed preset value and a first load preset value and / or a second load preset value and an air guide valve action time;

[0038] Among them, the action sequence and action interval of the air guide valve are consistent with the ignition sequence and ignition interval of each cylinder.

[0039] According to another aspect of the present invention, an exhaust control device is provided, comprising:

[0040] The signal acquisition unit is used to acquire engine signals, including engine speed signals, load signals, and crankshaft angle signals.

[0041] The judgment unit is used to analyze the engine signal and judge the working state of the engine.

[0042] A determination unit, used to determine an operating mode according to an engine operating state;

[0043] The execution unit is used to adjust the exhaust path according to the working mode and perform corresponding operations.

[0044] According to another aspect of the present invention, a vehicle is provided, specifically comprising: an exhaust system of any of the above-mentioned engines and any of the above-mentioned exhaust control devices.

[0045] The technical solution of the embodiment of the present invention is that in the exhaust system of the engine, the engine includes at least one cylinder and a supercharger, and the cylinder includes an exhaust valve; the exhaust system includes an exhaust valve, an exhaust duct, an exhaust manifold, an exhaust bypass pipe and an air guide valve; the exhaust duct is located between the exhaust valve and the air guide valve, one end of the exhaust duct is connected to the exhaust valve, and the other end is connected to the intake end of the air guide valve; the air guide valve is used to connect the first outlet end or the second outlet end by changing the action, the first outlet end is connected to the exhaust bypass pipe, and the second outlet end is connected to the exhaust manifold; the exhaust manifold is connected to the supercharger. Through the exhaust system and its control of the present invention, the action of the air guide valve is changed to control whether the supercharger participates in the exhaust, so as to solve the problem that the power is difficult to meet multiple needs, and can take into account the advantages of the turbocharged engine using the exhaust energy and the low back pressure and low residual exhaust gas of the naturally aspirated engine.

[0046] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] 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.

[0048] Figure 1 A schematic diagram of the structure of an exhaust system of an engine provided by an embodiment of the present invention;

[0049] Figure 2 A flow chart of a control method for an exhaust system provided by an embodiment of the present invention;

[0050] Figure 3 A flow chart of another exhaust system control method provided by an embodiment of the present invention;

[0051] Figure 4 A flow chart of another exhaust system control method provided by an embodiment of the present invention;

[0052] Figure 5 A flow chart of another exhaust system control method provided by an embodiment of the present invention;

[0053] Figure 6 A flow chart of another exhaust system control method provided by an embodiment of the present invention;

[0054] Figure 7 A flowchart of a control method for an exhaust system provided by an embodiment of the present invention;

[0055] Figure 8 The same exhaust valve lift curve diagram provided for the embodiment of the present invention;

[0056] Fig. 9 A schematic structural diagram of an exhaust device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0057] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme 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 described embodiments 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 creative work should fall within the scope of protection of the present invention.

[0058] It should be noted that the terms "first", "second", etc. in the specification 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 data 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 that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0059] Figure 1 FIG. 1 is a schematic diagram of the structure of an exhaust system of an engine provided by an embodiment of the present invention. This embodiment can be applied to a turbocharged engine, such as Figure 1 As shown, the turbocharged engine includes at least one cylinder 10 ( Figure 1 Four cylinders are shown in the figure, which is not a limitation of the embodiment of the present invention) and a turbocharger 80.

[0060] According to the present invention, an exhaust system of an engine is provided, the engine comprising at least one cylinder 10 and a supercharger 80, the cylinder comprising an exhaust valve 20;

[0061] The exhaust system includes an exhaust valve 20, an exhaust passage 30, an exhaust manifold 60, an exhaust bypass pipe 70 and an air guide valve 50;

[0062] The exhaust passage 30 is located between the exhaust valve 20 and the air guide valve 50, one end of the exhaust passage 30 is connected to the exhaust valve 20, and the other end is connected to the intake end of the air guide valve 50;

[0063] The air guide valve 50 is used to connect the first air outlet end or the second air outlet end by changing the action, the first air outlet end is connected to the exhaust bypass pipe 70, and the second air outlet end is connected to the exhaust manifold 60;

[0064] The exhaust manifold 70 is connected to a supercharger 80 .

[0065] The exhaust valve 20, the exhaust passage 30, and the exhaust valve 50 are connected in sequence, the first outlet end and the second outlet end of the exhaust valve 50 are respectively connected to the exhaust bypass pipe 70 and the exhaust manifold 60, the exhaust manifold 60 is connected to the supercharger 80, and the exhaust bypass pipe 70 bypasses the supercharger 80 and directly discharges the gas. The supercharger 80 may be a turbocharger 81.

[0066] It can be understood that the gas generated in the cylinder is discharged from the cylinder through the exhaust valve 20, passes through the exhaust duct 30 to the exhaust valve 50, and when the engine is in a low-load state, the exhaust valve 50 is opened and / or remains connected to the exhaust bypass pipe 70 to directly discharge the gas; when the engine is not in a low-load state, the exhaust valve 50 is opened and / or remains connected to the exhaust manifold 60, and passes through the supercharger 80 to improve the exhaust efficiency, utilize the exhaust energy, and make the exhaust back pressure low, reduce the residual exhaust gas in the cylinder, and improve the combustion state in the cylinder.

[0067] The technical solution of the embodiment of the present invention is that in the exhaust system of the engine, the engine includes at least one cylinder and a supercharger, and the cylinder includes an exhaust valve; the exhaust system includes an exhaust valve, an exhaust duct, an exhaust manifold, an exhaust bypass pipe and an air guide valve; the exhaust duct is located between the exhaust valve and the air guide valve, one end of the exhaust duct is connected to the exhaust valve, and the other end is connected to the intake end of the air guide valve; the air guide valve is used to connect the first outlet end or the second outlet end by changing the action, the first outlet end is connected to the exhaust bypass pipe, and the second outlet end is connected to the exhaust manifold; the exhaust manifold is connected to the supercharger. By changing the action of the air guide valve to control whether the supercharger participates in the exhaust, the problem that the power is difficult to meet multiple needs can be solved, and the advantages of the turbocharged engine utilizing the exhaust energy and the low back pressure and low residual exhaust gas of the naturally aspirated engine can be taken into account, and the exhaust energy can be utilized.

[0068] Continue to refer Figure 1 Optionally, the exhaust system further includes:

[0069] merges into airway 40;

[0070] The air inlet passage 40 is located between the exhaust passage 30 and the air guide valve 50 , with one end connected to the exhaust passage 30 and the other end connected to the air inlet end of the air guide valve 50 .

[0071] The inlet air passage 40 is used to collect and transmit the gas exhausted from the cylinder. Collecting the gas can concentrate the energy, and the exhaust through the exhaust manifold 60 and the supercharger 80 can improve the energy utilization rate of the exhaust; and directly exhausting through the exhaust bypass pipe 70 can accelerate the reduction of the supercharger pressure and reduce the residual exhaust gas.

[0072] It can be understood that each cylinder can work independently, and the generated gas is discharged from the cylinder through its own exhaust valve. The gas discharged from the cylinder is gathered by the intake air duct through the corresponding exhaust duct and then transmitted to the corresponding exhaust valve. Each air guide valve can work independently. When the engine is in a low-load state, the exhaust valve is opened and / or remains connected to the exhaust bypass pipe to directly discharge the gas, which can speed up the reduction of the supercharger pressure and reduce residual exhaust gas; when the engine is not in a low-load state, the exhaust valve is opened and / or remains connected to the exhaust manifold. Through the supercharger, the energy utilization rate of the exhaust can be improved, the exhaust efficiency can be improved, the exhaust energy can be utilized, the exhaust back pressure can be low, the residual exhaust gas in the cylinder is small, and the combustion state in the cylinder is improved.

[0073] Continue to refer Figure 1 Optionally, the exhaust system further includes:

[0074] Catalyst 90;

[0075] The air inlet end of the catalyst 90 is connected to the outlet end of the supercharger 80 and the air outlet end of the exhaust bypass pipe 70 respectively.

[0076] The catalyst 90 is used to purify the gas generated by the engine, including but not limited to a physical catalyst, a chemical catalyst and a three-way catalyst. The catalyst can purify the gas passing through the exhaust manifold 60 and the supercharger 80 and / or the exhaust bypass pipe 70.

[0077] It can be understood that each cylinder can work independently, and the generated gas passes through each exhaust valve and the corresponding exhaust duct in turn, and the gas exhausted by the cylinder is gathered by the intake duct and then transmitted to the corresponding exhaust valve. Each air guide valve can work independently, and the gas generated by the engine is transmitted to the catalyst for purification through the exhaust manifold and the supercharger and / or the exhaust bypass pipe. The gas passes through the exhaust bypass pipe and bypasses the supercharger, thereby reducing the reduction in the temperature of the exhaust gas due to the heat dissipation of the supercharger, accelerating the ignition of the catalyst, and improving the emission effect.

[0078] When the engine is in a low-load state, the exhaust valve is opened and / or remains connected to the exhaust bypass pipe to directly discharge the gas, which can accelerate the reduction of the pressure before the supercharger and reduce residual exhaust gas; when the engine is not in a low-load state, the exhaust valve is opened and / or remains connected to the exhaust manifold. Through the supercharger, the energy utilization rate of the exhaust gas can be improved, the exhaust efficiency can be improved, the exhaust energy can be utilized, the exhaust back pressure can be low, the residual exhaust gas in the cylinder can be reduced, and the combustion state in the cylinder can be improved.

[0079] The technical solution of the embodiment of the present invention adjusts the exhaust transmission path by changing the action of the air guide valve, controls whether the supercharger participates in the exhaust, and operates multiple cylinders and air guide valves independently to solve the problem that power is difficult to meet multiple needs. It can take into account the advantages of turbocharged engines in utilizing exhaust energy and naturally aspirated engines in low back pressure and low residual exhaust gas. It can not only improve the energy utilization rate of exhaust gas, improve exhaust efficiency, utilize exhaust energy, accelerate catalyst ignition, and improve emission effects, but also make the exhaust back pressure low, reduce the residual exhaust gas in the cylinder, and improve the combustion state in the cylinder.

[0080] Figure 2 This is a flow chart of a control method for an exhaust system provided by an embodiment of the present invention. This embodiment can be applied to exhaust scenarios under various working conditions of the engine. The method can be executed by an engine exhaust device, which can be configured in an engine whose power source includes fuel. Figure 2 As shown, the method specifically includes:

[0081] S110: Acquire engine signal.

[0082] Among them, the engine signal includes an engine speed signal, a load signal, and a crankshaft angle signal, which can be an engine signal acquired in real time. The engine signal is monitored and obtained by corresponding sensors, such as a speed sensor, a load sensor, and an angle sensor.

[0083] S120: Determine the engine operating state according to the engine signal.

[0084] Wherein, according to the obtained engine signal, the engine operating state is judged by hardware and / or software.

[0085] S130: Determine the current working mode according to the engine working state.

[0086] Wherein, the corresponding current working mode is determined according to the determined engine working state.

[0087] S140, adjusting the exhaust path according to the current working mode.

[0088] Among them, according to the current working mode, the action of the gas guide valve is controlled to adjust the path connected by the gas transmission.

[0089] It is understandable that, in conjunction with and with reference to Figure 1In the control method of the exhaust system, the engine signal is obtained, including the engine speed signal, the load signal, the crank angle signal and the corresponding real-time signal; the engine working state is judged by hardware and / or software according to the obtained engine signal; the current working mode is determined according to the determined working state; the air guide valve and the exhaust valve are controlled to open and / or keep connected to the exhaust bypass pipe according to the current working mode to directly discharge the gas, or the exhaust valve is opened and / or kept connected to the exhaust manifold to discharge the gas through the supercharger. It can be applied to different working states, select the corresponding working mode to adjust the exhaust path, so that the exhaust path is adjusted according to the current working mode to meet the exhaust gas needs of the engine under different working states, and exhaust interference can be avoided.

[0090] The technical solution of the embodiment of the present invention is to obtain an engine signal in the control method of the exhaust system; judge the engine working state according to the engine signal; determine the current working mode according to the engine working state; and can be applicable to adjusting the exhaust path according to the corresponding working mode under different working states, so that the exhaust path is adjusted according to the current working mode to meet the exhaust gas needs of the engine under different working states, thereby avoiding exhaust interference.

[0091] Optionally, Figure 3 A flow chart of another exhaust system control method provided in an embodiment of the present invention, wherein this embodiment further optimizes the scheme of the previous embodiment, wherein, optionally, on the basis of the above embodiment, the steps include judging the engine operating state according to the engine signal; determining the current operating mode according to the engine operating state; and adjusting the exhaust path refinement step according to the current operating mode.

[0092] Optionally, based on the above embodiment, after the step of determining the engine working state according to the engine signal, the following steps are added and the current working mode is determined according to the engine working state:

[0093] If the load signal is less than the first load preset value and the engine speed signal is less than the first speed preset value, the engine operating state is determined to be the first state and the first operating mode is determined.

[0094] The steps are refined according to the current working mode to adjust the exhaust path. The specific steps are:

[0095] The first working mode keeps the air guide valve connected to the first air outlet end so that the exhaust passage is connected to the exhaust bypass pipe.

[0096] like Figure 3 As shown, a flow chart of another exhaust system control method provided by an embodiment of the present invention includes the following steps:

[0097] S210, acquiring an engine signal;

[0098] S220, judging the engine operating state according to the engine signal;

[0099] S221, if the load signal is less than a first load preset value and / or the engine speed signal is less than a first speed preset value, determine that the engine operating state is a first state and determine it to be a first operating mode;

[0100] S240, in the first working mode, the air guide valve is kept connected to the first air outlet end so that the exhaust passage is connected to the exhaust bypass pipe.

[0101] It can be understood that in the control method of the exhaust system, the engine signal is obtained, including the engine speed signal, the load signal, the crank angle signal and the corresponding real-time signal; according to the obtained engine signal, the engine working state is judged by hardware and / or software; if the load signal is less than the first load preset value and / or the engine speed signal is less than the first speed preset value, the engine working state is judged to be the first state, and the first working mode is determined; the first working mode keeps the air guide valve connected to the first outlet end, so that the exhaust duct is connected to the exhaust bypass pipe to directly discharge the gas. It can be applied to the engine startup or low-load working state, and the corresponding working mode is selected to adjust the exhaust path.

[0102] Exemplarily, when the engine operates at 1000 r / min, which is much smaller than the first speed preset value of 5000, and the torque is 0.1 N·m, in such a non-boosted and low-load condition, the engine operating state is determined to be the first state, and the first operating mode is activated.

[0103] The technical solution of the embodiment of the present invention is, in the control method of the exhaust system, obtaining an engine signal; judging the engine working state according to the engine signal; judging that the engine working state is a first state, determining it as a first working mode, selecting the corresponding working mode to adjust the exhaust path, so that the exhaust path is adjusted according to the current working mode, which can be applicable to the engine starting or low-load working state, selecting the corresponding working mode to adjust the exhaust path, the exhaust gas all flows through the bypass exhaust pipe, not through the turbine, the exhaust back pressure is low, the residual exhaust gas in the cylinder is small, the pumping loss is small, and at the same time, the exhaust does not pass through the turbine, the temperature before the catalyst is high, which is beneficial to maintaining the catalyst temperature and improving the catalyst ignition speed at a small load.

[0104] Optionally, Figure 4 A flow chart of another exhaust system control method provided for an embodiment of the present invention, this embodiment and the previous embodiment may be parallel schemes, wherein, optionally, on the basis of the above embodiment, the steps include judging the engine working state according to the engine signal; determining the current working mode according to the engine working state; and adjusting the exhaust path refinement step according to the current working mode.

[0105] Optionally, based on the above embodiment, after the step of determining the engine working state according to the engine signal, the following steps are added and the current working mode is determined according to the engine working state:

[0106] If the load signal is greater than a second preset load value and / or the engine speed signal is greater than a second preset speed value, the engine operating state is determined to be the second state and the second operating mode is determined;

[0107] The steps are refined according to the current working mode to adjust the exhaust path. The specific steps are:

[0108] The second working mode keeps the air guide valve connected to the second air outlet end so that the exhaust passage is connected to the exhaust manifold.

[0109] The first speed preset value is smaller than the second speed preset value, and the first load preset value is smaller than the second load preset value.

[0110] like Figure 4 As shown, a flow chart of another exhaust system control method provided by an embodiment of the present invention includes the following steps:

[0111] S310, acquiring an engine signal;

[0112] S320, judging the engine operating state according to the engine signal;

[0113] S321, if the load signal is greater than a second preset load value and / or the engine speed signal is greater than a second preset speed value, the engine operating state is determined to be the second state, and the second operating mode is determined;

[0114] S340, in the second working mode, the air guide valve is kept connected to the second air outlet end so that the exhaust passage is connected to the exhaust manifold.

[0115] It can be understood that in the control method of the exhaust system, the engine signal is obtained, including the engine speed signal, the load signal, the crankshaft angle signal and the corresponding real-time signal; according to the obtained engine signal, the engine working state is judged by hardware and / or software; if the load signal is greater than the second load preset value and / or the engine speed signal is greater than the second speed preset value, the engine working state is judged to be the second state, and the second working mode is determined; the second working mode keeps the air guide valve connected to the second outlet end, so that the exhaust duct is connected to the exhaust manifold, and the gas is discharged after the supercharger. It can be applied to the high-load working state of the engine, and the corresponding working mode is selected to adjust the exhaust path.

[0116] For example, when the engine operates at 15000 r / min, which is much higher than the second speed preset value of 10000, and the torque is much higher than 800 N·m, in such a supercharged and high-load condition, the engine operating state is determined to be the second state, and the second operating mode is activated.

[0117] The technical solution of the embodiment of the present invention is to obtain an engine signal in the control method of the exhaust system; judge the engine working state according to the engine signal; determine that the engine working state is the second state, determine it as the second working mode, and select the corresponding working mode to adjust the exhaust path, so that the exhaust path is adjusted according to the current working mode. It can be suitable for the engine to work under high load. The corresponding working mode is selected to adjust the exhaust path. The exhaust gas all flows through the exhaust manifold and the turbine to provide boost pressure to improve the energy utilization rate of the exhaust gas, improve the exhaust efficiency, and improve the combustion state in the cylinder.

[0118] Optionally, Figure 5 A flow chart of another exhaust system control method provided for an embodiment of the present invention. This embodiment and the previous embodiment may be parallel schemes, wherein, optionally, on the basis of the above embodiment, the steps include judging the engine operating state according to the engine signal; determining the current operating mode according to the engine operating state; and adjusting the exhaust path refinement step according to the current operating mode.

[0119] Optionally, based on the above embodiment, after the step of determining the engine working state according to the engine signal, the following steps are added and the current working mode is determined according to the engine working state:

[0120] If the load signal is neither less than the first load preset value nor greater than the second load preset value and / or the engine speed signal is neither less than the first speed preset value nor greater than the second speed preset value, the engine operating state is determined to be the third state and determined to be the third operating mode.

[0121] The steps are refined according to the current working mode to adjust the exhaust path. The specific steps are:

[0122] The third working mode determines the action timing of the air guide valve according to the engine speed, load signal and crankshaft angle, controls the air guide valve to connect to the first outlet port, connects the exhaust duct to the exhaust bypass pipe or connects to the second outlet port, connects the exhaust duct to the exhaust manifold.

[0123] The first speed preset value is smaller than the second speed preset value, and the first load preset value is smaller than the second load preset value.

[0124] like Figure 5 As shown, a flow chart of another exhaust system control method provided by an embodiment of the present invention includes the following steps:

[0125] S410, acquiring an engine signal;

[0126] S420, judging the engine operating state according to the engine signal;

[0127] S421, if the load signal is neither less than the first preset load value nor greater than the second preset load value and / or the engine speed signal is neither less than the first preset speed value nor greater than the second preset speed value, determine that the engine operating state is the third state and determine to be the third operating mode;

[0128] S440, the third working mode determines the action time of the air guide valve according to the engine speed, load signal and crankshaft angle, controls the air guide valve to connect to the first air outlet end, connects the exhaust duct to the exhaust bypass pipe or connects to the second air outlet end, connects the exhaust duct to the exhaust manifold.

[0129] The crank angle signal can be used to determine the timing of the air guide valve operation, that is, the obtained crank angle signal is a specific signal to operate the air guide valve, switching from connecting the first outlet port to connect the exhaust duct to the exhaust bypass pipe to connecting the second outlet port to connect the exhaust duct to the exhaust manifold; or from connecting the second outlet port to connect the exhaust duct to the exhaust manifold to connecting the first outlet port to connect the exhaust duct to the exhaust bypass pipe. It is worth noting that the crank angle can be switched according to different supercharging working conditions to achieve optimal performance.

[0130] It can be understood that in the control method of the exhaust system, engine signals are obtained, including engine speed signals, load signals, crankshaft angle signals and corresponding real-time signals; based on the obtained engine signals, the engine operating state is judged by hardware and / or software; if the load signal is neither less than the first load preset value nor greater than the second load preset value and / or the engine speed signal is neither less than the first speed preset value nor greater than the second speed preset value, the engine operating state is judged to be the third state and determined to be the third operating mode; the third operating mode can switch the crankshaft angle according to different boost working conditions. If the load signal increases or suddenly increases within a range not less than the first load preset value, the gas guide valve switches the crankshaft angle to increase the cross-sectional area of ​​the gas that can enter the exhaust manifold to adapt to the increase in the load signal under the current medium load condition. , accordingly, the load signal decreases or suddenly decreases within a range not less than the first load preset value, and the gas guide valve switches the crankshaft angle to reduce the cross-sectional area of ​​the gas that can enter the exhaust manifold to adapt to the current medium load condition, the load signal is reduced; similarly, the engine speed signal increases or suddenly increases within a range not less than the first speed preset value, and the gas guide valve switches the crankshaft angle to increase the cross-sectional area of ​​the gas that can enter the exhaust manifold to adapt to the current medium load condition, the speed signal increases, accordingly, the speed signal decreases or suddenly decreases within a range not less than the first speed preset value, and the gas guide valve switches the crankshaft angle to reduce the cross-sectional area of ​​the gas that can enter the exhaust manifold to adapt to the current medium load condition, the speed signal decreases, and the gas guide valve is kept connected to the second outlet end, so that the exhaust duct is connected to the exhaust manifold, and the gas is discharged after the supercharger to achieve optimal performance.

[0131] For example, before the exhaust valve opens, the air guide valve is connected to the exhaust manifold; after the exhaust flows through the supercharged exhaust manifold for a period of time, when the cylinder pressure drops to the target value or the crankshaft angle reaches a specific value, the air guide valve is switched to connect to the bypass exhaust manifold, allowing the remaining low-pressure cylinder exhaust gas to be discharged through the bypass exhaust manifold. At this time, the gas does not flow through the turbine, the exhaust back pressure is low, the exhaust is smooth, and the residual exhaust gas in the cylinder is greatly reduced, which can improve the combustion of the next cycle and increase the charging efficiency.

[0132] The technical solution of the embodiment of the present invention is that in the control method of the exhaust system, an engine signal is obtained; the engine working state is judged according to the engine signal; if the engine speed signal is between the first speed preset value and the second speed preset value, the engine working state is judged to be the third state, and the third working mode is determined; the third working mode judges the action time of the air guide valve according to the engine speed, load signal, and crankshaft angle, and controls the air guide valve to connect to the first outlet end, so that the exhaust duct is connected to the exhaust bypass pipe or connected to the second outlet end, so that the exhaust duct is connected to the exhaust manifold. Under different boost conditions, the crankshaft angle of the air guide valve can be switched to achieve optimal performance, provide boost pressure, improve exhaust energy utilization, improve exhaust efficiency, and improve the combustion state in the cylinder.

[0133] Optionally, Figure 6 A flow chart of a control method for an exhaust system is also provided for an embodiment of the present invention. This embodiment and the previous embodiment may be parallel schemes, wherein, optionally, on the basis of the above embodiment, the steps include judging the engine operating state according to the engine signal; determining the current operating mode according to the engine operating state; and adjusting the exhaust path refinement step according to the current operating mode.

[0134] Optionally, based on the above embodiment, after the step of determining the engine working state according to the engine signal, the following steps are added and the current working mode is determined according to the engine working state:

[0135] According to the current engine speed and load signal, a preset control map is searched to obtain a first speed preset value and / or a second speed preset value and a first load preset value and / or a second load preset value and an air guide valve action time;

[0136] Among them, the action sequence and action interval of the air guide valve are consistent with the ignition sequence and ignition interval of each cylinder.

[0137] Among them, the preset control spectrum can be specially drawn by hardware and / or software according to the characteristics of the engine, and the obtained first speed preset value and second speed preset value and the first load preset value and / or the second load preset value can be used to divide the corresponding engine speed and load into a low load area, a medium load area and a high load area.

[0138] If the load signal is less than a first preset load value and / or the engine speed signal is less than a first preset speed value, the engine operating state is determined to be a first state and a first operating mode;

[0139] If the load signal is greater than a first preset load value and / or the engine speed signal is greater than a second preset speed value, the engine operating state is determined to be a second state and a second operating mode;

[0140] If the load signal is neither less than the first load preset value nor greater than the second load preset value and / or the engine speed signal is neither less than the first speed preset value nor greater than the second speed preset value, the engine operating state is determined to be the third state and determined to be the third operating mode.

[0141] The steps are refined according to the current working mode to adjust the exhaust path. The specific steps are:

[0142] In the first working mode, the air guide valve is kept connected to the first air outlet end so that the exhaust passage is connected to the exhaust bypass pipe;

[0143] In the second working mode, the air guide valve is kept connected to the second air outlet end so that the exhaust passage is connected to the exhaust manifold;

[0144] The third working mode determines the action timing of the air guide valve according to the engine speed, load signal and crankshaft angle, controls the air guide valve to connect to the first outlet port, connects the exhaust duct to the exhaust bypass pipe or connects to the second outlet port, connects the exhaust duct to the exhaust manifold.

[0145] like Figure 6 As shown, another flow chart of a control method for an exhaust system provided by an embodiment of the present invention includes the following steps:

[0146] S510, acquiring an engine signal;

[0147] S520, judging the engine operating state according to the engine signal;

[0148] S521, searching a preset control map according to the current engine speed and load signal to obtain a first speed preset value and / or a second speed preset value and a first load preset value and / or a second load preset value and an air guide valve action time;

[0149] S522: if the load signal is less than a first preset load value and / or the engine speed signal is less than a first preset speed value, the engine operating state is determined to be a first state and a first operating mode;

[0150] If the load signal is greater than a first preset load value and / or the engine speed signal is greater than a second preset speed value, the engine operating state is determined to be a second state and a second operating mode;

[0151] If the load signal is neither less than the first load preset value nor greater than the second load preset value and / or the engine speed signal is neither less than the first speed preset value nor greater than the second speed preset value, it is determined that the engine operating state is the third state and the third operating mode is determined;

[0152] S540, in the first working mode, the air guide valve is opened / maintained to be connected to the first air outlet end, so that the exhaust passage is connected to the exhaust bypass pipe;

[0153] In the second working mode, the air guide valve is switched to connect to the second air outlet end, so that the exhaust passage is connected to the exhaust manifold;

[0154] The third working mode determines the action timing of the air guide valve according to the engine speed, load signal and crankshaft angle, controls the air guide valve to connect to the first air outlet end, connects the exhaust duct to the exhaust bypass pipe or connects to the second air outlet end, connects the exhaust duct to the exhaust manifold; the action sequence and action interval of the air guide valve are consistent with the ignition sequence and ignition interval of each cylinder.

[0155] It can be understood that in the control method of the exhaust system, the engine signal is obtained, including the engine speed signal, the load signal, the crankshaft angle signal and the corresponding real-time signal; according to the obtained engine signal, the preset control pulse spectrum is specially drawn by hardware and / or software according to the characteristics of the engine, and the low load area, medium load area and high load area of ​​the corresponding engine speed and load can be divided by the obtained first speed preset value and the second speed preset value to judge the engine working state; if the load signal is less than the second load preset value and / or the engine speed signal is less than the first speed preset value, the engine working state is determined to be the first state and determined to be the first working mode; if the load signal is greater than the second load preset value and / or the engine speed signal is greater than the second speed preset value, the engine is determined to be in the first state. The working state is the second state, which is determined to be the second working mode; if the load signal is neither less than the first load preset value nor greater than the second load preset value and / or the engine speed signal is neither less than the first speed preset value nor greater than the second speed preset value, it is determined that the engine working state is the third state, which is determined to be the third working mode; the first working mode keeps the air guide valve connected to the first air outlet end so that the exhaust duct is connected to the exhaust bypass pipe; the second working mode keeps the air guide valve connected to the second air outlet end so that the exhaust duct is connected to the exhaust manifold; the third working mode determines the action timing of the air guide valve according to the engine speed, load signal and crankshaft angle, controls the air guide valve to connect to the first air outlet end so that the exhaust duct is connected to the exhaust bypass pipe or connects to the second air outlet end so that the exhaust duct is connected to the exhaust manifold, and the action sequence and action interval of the air guide valve are consistent with the ignition sequence and ignition interval of each cylinder.

[0156] Further, to specifically illustrate the present embodiment, Figure 7 A control method program diagram of an exhaust system provided by an embodiment of the present invention, combined with Figure 6 refer to Figure 7 ,like Figure 7As shown, after the engine is started, the engine speed, load, crankshaft angle and corresponding real-time signals are obtained. According to the obtained engine signals, a preset control pulse spectrum is specially drawn by hardware and / or software according to the characteristics of the engine. The obtained first speed preset value and second speed preset value can be used to divide the corresponding engine speed and load into a low load area, a medium load area and a high load area to judge the engine working state; if the load signal is less than the second load preset value and / or the engine speed signal is less than the first speed preset value, that is, the speed signal and / or the load signal are in the low load area, it is determined that the engine working state is the first state, determined as the first working mode, and the air guide valve is opened and / or maintained to be connected to the first outlet end, so that the exhaust duct is connected to the exhaust bypass pipe; if the load signal is greater than the second load preset value and / or the engine speed signal is greater than the second speed preset value value, that is, the speed signal and / or the load signal are in the high load area, the engine working state is determined to be the second state, determined to be the second working mode, and the air guide valve is switched and / or maintained to be connected to the second air outlet end, so that the exhaust duct is connected to the exhaust manifold; if the load signal is neither less than the first load preset value nor greater than the second load preset value and / or the engine speed signal is neither less than the first speed preset value nor greater than the second speed preset value, that is, the speed signal and / or the load signal are in the medium load area, the engine working state is determined to be the third state, and the air guide valve action timing is determined according to the engine speed, the load signal, and the crankshaft angle, and the air guide valves working independently of the multiple cylinders are controlled to be connected to the first air outlet end, so that the exhaust duct is connected to the exhaust bypass pipe or connected to the second air outlet end, so that the exhaust duct is connected to the exhaust manifold, and the action sequence and action interval of the air guide valve are consistent with the ignition sequence and ignition interval of each cylinder, until it is determined that the engine has not started and the operation is ended.

[0157] Exemplarily, when the engine operates at 2000r / min-2bar and is not boosted and has a low load, the first operating mode is activated, and all the exhaust gas flows through the bypass exhaust line without passing through the turbine. The exhaust back pressure is low, there is less residual exhaust gas in the cylinder, and the pumping loss is small. The exhaust does not pass through the turbine, and the temperature in front of the catalyst is high, which is beneficial to maintaining the catalyst temperature and improving the catalyst ignition speed under low load.

[0158] Exemplarily, when the engine operates at 4500r / min-15bar and under high boost load conditions, the third operating mode is activated. In the first stage after the exhaust valve opens, the air guide valve is connected to the exhaust manifold, and the high-pressure exhaust flows through the turbine. The turbine works to provide boost pressure. When it runs to a specific crankshaft angle, the air guide valve opens the exhaust bypass pipe, and the low-pressure exhaust flows through the bypass exhaust line without being hindered by the turbine. The exhaust is smooth, and more residual exhaust gas in the cylinder can be discharged, thereby improving the combustion condition in the cylinder and reducing pumping losses.

[0159] Accordingly, Figure 8 The same exhaust valve lift curve diagram provided by the embodiment of the present invention is shown in FIG. Figure 8 In the third working mode, the required turbine work capacity varies with the speed and load. For example, at high load, a large turbocharging capacity is required, and the crankshaft angle duration of the exhaust valve opening the exhaust manifold accounts for a large proportion of the entire exhaust valve lift curve opening time, that is, under the same exhaust valve lift curve, the crankshaft angle value is larger. At medium load, the required turbocharging capacity is small, and the crankshaft angle duration of the exhaust valve opening the exhaust manifold accounts for a small proportion of the entire exhaust valve lift curve opening time, that is, under the same exhaust valve lift curve, the crankshaft angle value is smaller.

[0160] Before the exhaust valve opens, the air guide valve is connected to the supercharged exhaust manifold; after the exhaust flows through the supercharged exhaust manifold for a period of time, when the cylinder pressure drops to the target value or the crankshaft angle reaches a specific value, the air guide valve switches to connect to the bypass exhaust manifold, allowing the remaining low-pressure cylinder exhaust gas to be discharged through the bypass exhaust manifold. At this time, the gas does not flow through the turbine, the exhaust back pressure is low, the exhaust is smooth, and the residual exhaust gas in the cylinder is greatly reduced, which can improve the combustion of the next cycle and increase the charging efficiency. Under different supercharged conditions, the crankshaft angle of the air guide valve can be switched to achieve optimal performance. The second working mode is the working state of the traditional supercharged engine. The air guide valve is always connected to the supercharged exhaust pipeline. In the supercharged area, the exhaust bypass valve is used to control the load. The traditional supercharged engine working mode is retained mainly to sacrifice some fuel consumption during the transient working conditions of the engine and reduce the complexity of system control.

[0161] The technical solution of the embodiment of the present invention is that in the control method of the exhaust system, an engine signal is obtained; the engine working state is judged according to the engine signal; if the engine speed signal is between the first speed preset value and the second speed preset value, the engine working state is judged to be the third state, and the third working mode is determined; the third working mode judges the action time of the air guide valve according to the engine speed, load signal, and crankshaft angle, and controls the air guide valve to connect to the first outlet end, so that the exhaust duct is connected to the exhaust bypass pipe or connected to the second outlet end, so that the exhaust duct is connected to the exhaust manifold. Under different boost conditions, the crankshaft angle of the air guide valve can be switched to achieve optimal performance, provide boost pressure, improve exhaust energy utilization, improve exhaust efficiency, and improve the combustion state in the cylinder.

[0162] Based on the same inventive concept, an embodiment of the present invention provides a structure of an exhaust system device, which is used to execute any of the above-mentioned engine starting control methods and has corresponding functional modules and beneficial effects for executing the above-mentioned exhaust system control methods.

[0163] Fig. 9 A schematic diagram of the structure of an exhaust device provided in an embodiment of the present invention, the exhaust system device includes a signal acquisition unit 310, a judgment unit 320, a determination unit 330 and an execution unit 340.

[0164] The signal acquisition unit 310 is used to acquire engine signals, including engine speed signals, load signals, and crankshaft angle signals.

[0165] The judgment unit 320 is used to analyze the engine signal and judge the working state of the engine.

[0166] A determination unit 330, configured to determine an operating mode according to an engine operating state;

[0167] The execution unit 340 is used to adjust the exhaust path according to the working mode and perform corresponding operations.

[0168] Among them, the above-mentioned units can all complete the corresponding contents by means of hardware and / or software, and the hardware can be corresponding devices such as sensors, processors, switches, etc.

[0169] Specifically, the signal acquisition unit 310 of the exhaust system acquires the engine speed signal, load signal, crankshaft angle signal and corresponding real-time signal through the sensor; the judgment unit 320 analyzes the engine signal, draws the corresponding exhaust valve lift curve, acquires the first speed preset value, the second speed preset value, the first load preset value, the second load preset value and the air guide valve action time, and judges the engine working state, which includes the first state, the second state and the third state; then the determination unit 330 determines the working mode according to the engine working state, which includes the first working mode, the second working mode and the third working mode; finally, the execution unit 340 adjusts the exhaust path according to the working mode, performs the corresponding operation, and selects the exhaust path. The following schemes may exist in this process.

[0170] In some embodiments, in a first state, a first working mode is determined, and the air guide valve is opened / maintained to be connected to the first air outlet end, so that the exhaust passage is connected to the exhaust bypass pipe.

[0171] In some embodiments, in the second state, a second working mode is determined, and the air guide valve is switched / maintained to be connected to the second air outlet end so that the exhaust passage is connected to the exhaust manifold.

[0172] In some embodiments, in the third state, the third working mode is determined, and the action timing of the air guide valve is judged according to the engine speed, the load signal, and the crankshaft angle, and the air guide valve is controlled to connect to the first air outlet end, so that the exhaust duct is connected to the exhaust bypass pipe or connected to the second air outlet end, so that the exhaust duct is connected to the exhaust manifold; it is worth noting that the action sequence and action interval of the air guide valve are consistent with the ignition sequence and ignition interval of each cylinder.

[0173] By controlling the exhaust system in different states through the above embodiment, various power requirements can be met. For example, when the engine speed and load signal in the third state change, multiple cylinders can be controlled through the air guide valve to join multiple exhaust passages to meet different power requirements.

[0174] Based on the same inventive concept, embodiment 4 of the present invention provides a vehicle, which includes the engine exhaust system device provided in the above embodiment, and the device is used to execute the exhaust control method provided in the above embodiment, and has functional modules and beneficial effects corresponding to the execution method.

[0175] In an embodiment of the present invention, an engine signal is obtained, including an engine speed signal, a load signal, a crankshaft angle signal and a corresponding real-time signal; based on the obtained engine signal, a preset control pulse spectrum is specially drawn by hardware and / or software according to the characteristics of the engine, and the first speed preset value and the second speed preset value, the first load preset value and the second load preset value obtained can be used to divide the corresponding engine speed and load into a low load area, a medium load area and a high load area to judge the engine working state; if the load signal is less than the first load preset value and / or the engine speed signal is less than the first speed preset value, the engine working state is determined to be the first state and determined to be the first working mode; if the load signal is greater than the second load preset value and / or the engine speed signal is greater than the second speed preset value, the engine working state is determined to be the second state and determined to be the second working mode; if the load signal is greater than the second load preset value and / or the engine speed signal is greater than the second speed preset value, the engine working state is determined to be the second state and determined to be the second working mode; The signal is neither less than the first load preset value nor greater than the second load preset value and / or the engine speed signal is neither less than the first speed preset value nor greater than the second speed preset value, the engine operating state is determined to be the third state, and is determined to be the third operating mode; the first operating mode keeps the air guide valve connected to the first air outlet end so that the exhaust duct is connected to the exhaust bypass pipe; the second operating mode keeps the air guide valve connected to the second air outlet end so that the exhaust duct is connected to the exhaust manifold; the third operating mode determines the action timing of the air guide valve according to the engine speed, load signal, and crankshaft angle, controls the air guide valve to connect to the first air outlet end, so that the exhaust duct is connected to the exhaust bypass pipe or connected to the second air outlet end, so that the exhaust duct is connected to the exhaust manifold, the action sequence and action interval of the air guide valve are consistent with the ignition sequence and ignition interval of each cylinder, the engine speed and load signal in the third state change, and multiple exhaust ducts can be controlled by multiple cylinders through the air guide valve to join to meet different power requirements.

[0176] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0177] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for controlling an engine exhaust system, characterized in that: The engine includes at least two cylinders and a supercharger, the cylinders including exhaust valves; The exhaust system includes an exhaust valve, an exhaust duct, an exhaust manifold, an exhaust bypass pipe, an air guide valve and a catalyst; The exhaust passage is located between the exhaust valve and the air guide valve, one end of the exhaust passage is connected to the exhaust valve, and the other end is connected to the intake end of the air guide valve; The air guide valve is used to connect to the first air outlet end or the second air outlet end by changing the action, the first air outlet end is connected to the exhaust bypass pipe, and the second air outlet end is connected to the exhaust manifold; The exhaust manifold is connected to the supercharger; The air inlet end of the catalyst is connected to the outlet end of the supercharger and the air outlet end of the exhaust bypass pipe respectively; A method for controlling an exhaust system, comprising: Get engine signal; determining the engine operating state according to the engine signal; determining a current operating mode according to the engine operating state; adjusting the exhaust path according to the current working mode; Wherein, the engine signal includes an engine speed signal, a load signal, and a crankshaft angle signal; The determining the engine operating state according to the engine signal comprises: The load signal is neither less than the first load preset value nor greater than the second load preset value and / or the engine speed signal is neither less than the first speed preset value nor greater than the second speed preset value, that is, the engine is in a medium load condition, and the engine working state is determined to be the third state, and is determined to be the third working mode; The adjusting the exhaust path according to the current working mode includes: The third working mode determines the action time of the air guide valve according to the engine speed, the load signal and the crankshaft angle, controls the air guide valve to connect to the first outlet port, connects the exhaust passage to the exhaust bypass pipe or connects to the second outlet port, connects the exhaust passage to the exhaust manifold; Wherein, the first speed preset value is smaller than the second speed preset value, and the first load preset value is smaller than the second load preset value; Searching a preset control map according to the current engine speed and load signal to obtain the first speed preset value and / or the second speed preset value and the first load preset value and / or the second load preset value and the air guide valve action time; Wherein, the action sequence and action interval of the air guide valve are consistent with the ignition sequence and ignition interval of each cylinder; Before the exhaust valve opens, the air guide valve is connected to the exhaust manifold; after the exhaust gas flows through the exhaust manifold and is pressurized for a period of time, when the cylinder pressure drops to the target value, the air guide valve is switched to connect to the exhaust bypass pipe, allowing the remaining low-pressure exhaust gas in the cylinder to be discharged through the exhaust bypass pipe.

2. The control method according to claim 1, characterized in that: include: merges into the airway; The air inlet passage is located between the exhaust passage and the air guide valve, one end of which is connected to the exhaust passage, and the other end of which is connected to the air inlet end of the air guide valve.

3. The control method according to claim 1, characterized in that: Judging the engine operating state according to the engine signal includes: If the load signal is less than a first load preset value and / or the engine speed signal is less than a first speed preset value, it is determined that the engine operating state is a first state and is determined to be a first operating mode; The adjusting the exhaust path according to the current working mode includes: The first working mode keeps the air guide valve connected to the first air outlet end so that the exhaust passage is connected to the exhaust bypass pipe.

4. The control method according to claim 3, characterized in that: Judging the engine operating state according to the engine signal also includes: If the load signal is greater than a second load preset value and the engine speed signal is greater than a second speed preset value, it is determined that the engine operating state is the second state and is determined to be the second operating mode; The adjusting the exhaust path according to the current working mode includes: The second working mode keeps the air guide valve connected to the second air outlet end so that the exhaust passage is connected to the exhaust manifold; Among them, the first speed preset value is smaller than the second speed preset value, and the first load preset value is smaller than the second load preset value.

5. An exhaust control device, characterized in that: The control method of the engine exhaust system according to any one of claims 1 to 4 comprises: A signal acquisition unit, used to acquire the engine signal, including an engine speed signal, a load signal, and a crankshaft angle signal; A judgment unit, used for analyzing the engine signal to judge the working state of the engine; a determination unit, configured to determine an operating mode according to the engine operating state; The execution unit is used to adjust the exhaust path according to the working mode and perform corresponding operations.

6. A vehicle, characterized in that: include: The exhaust gas control device as claimed in claim 5.

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