A post-processing pipeline of a vehicle and a post-processing method of a vehicle

Abstract

The embodiment of the present invention provides a post-processing pipeline of a vehicle and a post-processing method of the vehicle, wherein the post-processing pipeline includes a heating pipeline, an oxygenation pipeline and a cooling pipeline, wherein the first end of the heating pipeline is used to introduce air, and the second end is respectively connected to the first end of the oxygenation pipeline and the first end of the cooling pipeline, and part of the pipeline is located in the exhaust pipeline of the TWC; a one-way valve is provided on the oxygenation pipeline, and the second end is connected to the GPF through a nozzle; an air release valve is provided on the cooling pipeline, and the second end is used to guide out the air, and since the exhaust pipeline of the TWC is connected to the engine exhaust pipe of the vehicle, the exhaust pipeline of the TWC has high-temperature exhaust gas of the engine, and the air flowing through the heating pipeline is fully heated by the high-temperature exhaust gas, and the gas is then controlled by the one-way valve to flow through the oxygenation pipeline and charged into the GPF to supplement oxygen, thereby improving the regeneration efficiency of the GPF; and the high-temperature exhaust gas can also be cooled, thereby reducing the temperature of the TWC, and the heated air is discharged from the cooling pipeline without affecting the engine emission.

Description

Technical Field

[0001] The present invention relates to the field of automobile technology, and in particular to a post-processing pipeline of a vehicle and a post-processing method of the vehicle. Background Art

[0002] In order to reduce vehicle exhaust pollution, vehicles currently often use a front-stage TWC (Three Way Catalyst Converter)-rear-stage GPF (Gasoline Particulate Filter) as a post-treatment system, and the exhaust pipe is connected to the post-treatment system to discharge the exhaust gas after post-treatment, thereby reducing pollutants, particulate matter, etc. in the vehicle exhaust.

[0003] In order to reduce exhaust pollution, higher requirements are placed on the vehicle's emission cycle, so that for vehicles, especially those with heavy vehicle mass and high actual vehicle sliding resistance, during operation, such as emergency and acceleration conditions, the vehicle's engine is prone to run into the critical area of ​​external characteristics, so that the actual temperature of the TWC is close to or even exceeds the tolerance temperature, causing TWC aging and affecting the service life of the TWC; at the same time, during the use of the GPF, due to factors such as poor fuel atomization and mixing, soot particles may accumulate on the GPF surface and the surface of the holes inside the wall. At this time, it is necessary to control the regeneration of the GPF to burn and consume the accumulated soot particles. However, the oxygen content of the GPF regeneration can only be achieved under the deceleration and fuel cut-off conditions, making the GPF regeneration conditions difficult to meet.

[0004] In response to the problem of high-temperature aging of TWC, the temperature of TWC is often over-estimated and controlled. When the estimated temperature, which is 15°C to 25°C higher than the actual measured temperature, reaches the risk value, the engine air-fuel ratio is increased to reduce the exhaust temperature, thereby reducing the TWC temperature. However, when the actual temperature is close to the tolerance temperature, if the estimated temperature differs greatly from the tolerance temperature, the estimated temperature may exceed the tolerance temperature. At this time, the engine enriches the air-fuel ratio according to the tolerance temperature, resulting in increased engine pollutant emissions. If the estimated temperature differs slightly from the tolerance temperature, the TWC may be at high-temperature aging risk but the mechanism of enriching the engine air-fuel ratio to reduce the temperature cannot be triggered, resulting in rapid aging of the TWC, high-temperature ablation and other component durability problems and vehicle safety risks; or, a solution can be adopted in which sprayers, high-pressure pumps and other devices are added to spray water into the engine combustion chamber when the TWC temperature is high, thereby reducing the temperature in the engine cylinder, and then reducing the exhaust temperature, thereby reducing the TWC temperature. However, this solution requires the addition of sprayers, high-pressure pumps and other devices, which increases the engine manufacturing cost, is difficult to implement, and has complex control logic and low cooling efficiency.

[0005] In order to solve the problem that the regeneration conditions of GPF are difficult to meet, a solution is currently often adopted in which a pipeline is added, and the pipeline is connected to a heat pipe fixed on the outer wall of the TWC, and the heat pipe is connected to the GPF inlet. Therefore, after air is introduced into the pipeline, the air can be heated by the heat pipe and then filled into the GPF to meet the temperature and oxygen content conditions of regeneration. However, in this method, the heat pipe fixed on the outer wall of the TWC has poor thermal conductivity to air, which may cause the added air to lower the GPF temperature, making it difficult to achieve the temperature in the regeneration conditions, which in turn affects the regeneration efficiency of the GPF. Summary of the invention

[0006] In view of the above problems, an embodiment of the present invention is proposed to provide a vehicle post-processing pipeline and a vehicle post-processing method to overcome the problems in the prior art that TWC is prone to high temperature aging, has high cooling cost and low efficiency, and has poor applicability and low efficiency of GPF regeneration.

[0007] According to a first aspect of the present invention, there is provided a post-processing pipeline of a vehicle, the post-processing pipeline is applied to a post-processing end, the post-processing end comprises a three-way catalytic converter and a gasoline engine particulate matter trap, the exhaust pipeline of the three-way catalytic converter is connected to the exhaust pipe of the engine of the vehicle, wherein the post-processing pipeline comprises a heating pipeline, an oxygenation pipeline and a cooling pipeline;

[0008] The first end of the heating pipeline is used to introduce air, the second end of the heating pipeline is connected to the first end of the oxygenation pipeline and the first end of the cooling pipeline respectively, and part of the heating pipeline is located in the exhaust pipeline of the three-way catalytic converter;

[0009] A one-way valve is provided on the oxygen filling pipeline, and the second end of the oxygen filling pipeline is connected to the gasoline engine particulate matter collector through a nozzle;

[0010] The cooling pipeline is provided with an air release valve, and the second end of the cooling pipeline is used for extracting air.

[0011] Optionally, at least a portion of the heating pipeline located in the exhaust pipeline of the three-way catalytic converter is a gradually expanding pipe.

[0012] Optionally, a portion of the heating pipeline located outside the exhaust pipeline of the three-way catalytic converter to the second end of the heating pipeline and at least a portion of the oxygenation pipeline are tapered pipes.

[0013] Optionally, the second end of the oxygenation pipeline is connected to the gasoline engine particulate matter collector through a first nozzle and a second nozzle respectively;

[0014] The first nozzle and the second nozzle are radially symmetrically arranged at the inlet of the gasoline engine particulate matter collector.

[0015] Optionally, an air filter is provided at the first end of the heating pipeline.

[0016] Optionally, the second end of the cooling pipeline is connected to the outlet of the gasoline engine particulate matter collector.

[0017] According to a second aspect of the present invention, there is also provided a post-processing method for a vehicle, which is applied to the post-processing pipeline described in the first aspect, and the method may include:

[0018] During the operation of the vehicle, obtaining the operation parameters of the vehicle;

[0019] When the operating parameters meet the oxygenation condition, the one-way valve is controlled to open and the air release valve is closed, so that air is introduced from the first end of the heating pipeline, flows to the second end of the heating pipeline, enters the oxygenation pipeline, and is sprayed into the gasoline engine particulate matter collector through the nozzle at the second end of the oxygenation pipeline;

[0020] When the operating parameters do not meet the oxygenation conditions but meet the cooling conditions, the air release valve is controlled to open and the one-way valve is closed, so that air is introduced from the first end of the heating pipeline, flows to the second end of the heating pipeline, enters the cooling pipeline, and flows out from the second end of the cooling pipeline.

[0021] Optionally, the operating parameters include engine speed, carbon load of gasoline engine particulate matter trap, and gasoline engine particulate matter trap inlet temperature. When the operating parameters meet the oxygenation condition, the one-way valve is controlled to be opened and the air release valve is closed, so that air is introduced from the first end of the heating pipeline, flows to the second end of the heating pipeline, enters the oxygenation pipeline, and is sprayed into the gasoline engine particulate matter trap through the nozzle at the second end of the oxygenation pipeline, including:

[0022] When the engine speed is less than or equal to the speed threshold, and the carbon load of the gasoline engine particulate matter trap is greater than or equal to the carbon load threshold, determining that the operating parameters meet the oxygenation condition;

[0023] Determine the target injection frequency according to a first preset relationship between the engine speed and the injection frequency, and determine the target injection coefficient according to a second preset relationship between the gasoline engine particulate matter trap inlet temperature and the injection coefficient;

[0024] determining an air injection frequency according to the target injection frequency and the target injection coefficient;

[0025] The one-way valve is controlled to open and the air release valve is controlled to close, so that air is introduced from the first end of the heating pipeline, flows to the second end of the heating pipeline, enters the oxygenation pipeline, and is sprayed into the gasoline engine particulate matter collector through the nozzle at the second end of the oxygenation pipeline at the air injection frequency.

[0026] Optionally, the operating parameters further include an engine intake temperature and an engine water temperature. When the engine speed is less than or equal to a speed threshold, and the carbon load of the gasoline engine particulate matter trap is greater than or equal to a carbon load threshold, before determining that the operating parameters meet the oxygenation conditions, the following steps are further included:

[0027] When the engine is in a non-ignition state, the engine intake temperature corresponds to a preset intake temperature range, the engine water temperature is greater than or equal to the preset water temperature, and the gasoline engine particulate matter collector inlet temperature is less than or equal to the preset inlet temperature, determine whether the operating parameters meet the oxygenation conditions.

[0028] Optionally, the operating parameters further include a temperature of a three-way catalytic converter. When the operating parameters do not meet the oxygenation condition but meet the cooling condition, the air release valve is controlled to be opened and the one-way valve is closed, so that air is introduced from the first end of the heating pipeline, flows to the second end of the heating pipeline, enters the cooling pipeline, and flows out from the second end of the cooling pipeline, including:

[0029] When the engine speed is greater than a speed threshold, the carbon load of the gasoline engine particulate matter trap is less than a carbon load threshold, and the temperature of the three-way catalytic converter is greater than or equal to a temperature threshold, determining that the operating parameters meet the cooling condition;

[0030] The air release valve is controlled to open and the one-way valve is controlled to close, so that air is introduced from the first end of the heating pipeline, flows to the second end of the heating pipeline, enters the cooling pipeline, and flows out from the second end of the cooling pipeline.

[0031] The embodiments of the present invention include the following advantages:

[0032] The post-treatment pipeline provided in the embodiment of the present invention is applied to the three-way catalytic converter and the gasoline engine particulate matter collector at the post-treatment end, wherein the pipeline includes a heating pipeline, an oxygenation pipeline and a cooling pipeline. The first end of the heating pipeline is used to introduce air, and the second end is connected to the first end of the oxygenation pipeline and the first end of the cooling pipeline respectively, and part of the heating pipeline is located in the exhaust pipeline of the three-way catalytic converter; a one-way valve is provided on the oxygenation pipeline, and the second end of the oxygenation pipeline is connected to the gasoline engine particulate matter collector through a nozzle; an air release valve is provided on the cooling pipeline, and the second end of the cooling pipeline is used to lead out air. Since the exhaust pipeline of the three-way catalytic converter is connected to the vehicle's The engine exhaust pipe is connected, so there is high-temperature exhaust gas from the engine in the exhaust pipe of the three-way catalytic converter. The high-temperature exhaust gas is fully in contact with a part of the heating pipe in the exhaust pipe of the three-way catalytic converter, and the air flowing through the heating pipe is fully heated, thereby ensuring the heating effect of the air. The gas can be controlled by a one-way valve to flow through the oxygenation pipe and filled into the GPF to meet the temperature and oxygen content conditions of the regeneration of the GPF, thereby improving the regeneration efficiency of the GPF; and it can also reduce the temperature of the high-temperature exhaust gas, thereby reducing the temperature of the TWC that receives the high-temperature exhaust gas. The heated air can also be controlled by the bleed valve to flow through the cooling pipe and discharged without affecting the engine emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of a post-processing pipeline of a vehicle provided by an embodiment of the present invention;

[0034] Figure 2 is a flowchart of a post-processing method for a vehicle provided by an embodiment of the present invention;

[0035] Figure 3 It is a schematic diagram of engine speed-load distribution provided by an embodiment of the present invention;

[0036] Figure 4 It is a schematic diagram of a first preset relationship between engine speed and injection frequency provided by an embodiment of the present invention;

[0037] Figure 5 It is a schematic diagram of a second preset relationship between the inlet temperature and the injection coefficient of a gasoline engine particulate matter collector provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0038] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] Embodiment 1

[0040] Reference Figure 1, showing a schematic structural diagram of a post-processing pipeline of a vehicle, the post-processing pipeline is applied to the post-processing end of the vehicle, the post-processing end includes a three-way catalytic converter 11 and a gasoline engine particulate matter collector 12, the exhaust pipeline 111 of the three-way catalytic converter 11 is connected to the engine exhaust pipe of the vehicle, wherein the post-processing pipeline includes a heating pipeline 13, an oxygenation pipeline 14 and a cooling pipeline 15.

[0041] In the embodiment of the present invention, the after-treatment end is used to treat the high-temperature exhaust gas of the vehicle engine, so as to reduce the environmental pollutants in the high-temperature exhaust gas, wherein the three-way catalytic converter 11 is the front stage of the after-treatment end, and its exhaust pipe is connected to the engine exhaust pipe of the vehicle. When receiving the high-temperature exhaust gas discharged from the engine exhaust pipe, it catalyzes the hydrocarbons, carbon monoxide, nitrogen oxides and other pollutants therein to undergo oxidation-reduction reactions to reduce the content of the pollutants. The gasoline engine particulate matter collector 12 is the rear stage of the after-treatment end and is connected to the three-way catalytic converter 11. It can receive the high-temperature exhaust gas treated by the three-way catalytic converter 11 and capture the particulate matter therein, so as to reduce the content of the particulate matter, so as to achieve sufficient after-treatment of the high-temperature exhaust gas.

[0042] In the embodiment of the present invention, a post-processing pipeline is integrated on the post-processing end. According to different integration positions, connection structures, and implemented functions, the post-processing pipeline may include a heating pipeline 13, an oxygenation pipeline 14, and a cooling pipeline 15, etc., as described in detail as follows:

[0043] The first end 131 of the heating pipeline 13 is used to introduce air, and the second end 132 of the heating pipeline 13 is respectively connected to the first end 141 of the oxygenation pipeline 14 and the first end 151 of the cooling pipeline 15, and a part of the pipeline 133 of the heating pipeline 13 is located in the exhaust pipeline 111 of the three-way catalytic converter 11.

[0044] In the embodiment of the present invention, the first end 131 of the heating pipeline 13 is used to introduce air. Optionally, an air pump can be provided on the heating pipeline 13 to pump air from the environment into the heating pipeline 13. Different air introduction methods can also be selected according to the engine model, such as using an intake pressure relief valve to introduce air for a supercharged engine. The second end 132 of the heating pipeline 13 is respectively connected to the first end 141 of the oxygenation pipeline 14 and the first end 151 of the cooling pipeline 15, so that the gas in the heating pipeline 13 can flow into the oxygenation pipeline 14 through the second end 132, and can also flow into the cooling pipeline 15. A part of the pipeline 133 of the heating pipeline 13 is located in the exhaust pipeline 111 of the three-way catalytic converter 11, so that the air introduced into the heating pipeline 13 can fully contact with the high-temperature exhaust gas in the exhaust pipeline 111 of the three-way catalytic converter 11 through the heating pipeline 13 when flowing through the heating pipeline 13.

[0045] The oxygenation pipeline 14 is provided with a one-way valve 142 , and the second end 143 of the oxygenation pipeline 14 is connected to the gasoline engine particulate matter trap 12 through a nozzle.

[0046] In the embodiment of the present invention, a one-way valve 142 may be provided on the oxygenation pipeline 14. When the gasoline engine particulate matter filter needs to be regenerated but the regeneration conditions cannot be met, the one-way valve 142 may be opened or closed, thereby controlling the heated air in the heating pipeline 13 to flow into the oxygenation pipeline 14 and then be sprayed into the gasoline engine particulate matter filter 12 through the nozzle at the second end 143, thereby providing the gasoline engine particulate matter filter 12 with oxygen supplement that meets the regeneration temperature conditions.

[0047] The cooling pipeline 15 is provided with an air release valve 152 , and the second end 153 of the cooling pipeline 15 is used to discharge air.

[0048] In the embodiment of the present invention, a bleed valve 152 may be provided on the cooling pipeline 15. When the three-way catalytic converter 11 needs to be cooled and the gasoline engine particulate matter collector 12 does not need to be supplemented with oxygen, the bleed valve 152 may be controlled to be opened or closed, thereby controlling the heated air in the heating pipeline 13 to be discharged from the second end 153, so as to reduce the temperature of the high-temperature exhaust gas without affecting the engine emissions, thereby cooling the three-way catalytic converter 11, wherein the second end 153 of the cooling pipeline 15 may be in contact with the ambient air.

[0049] In the embodiment of the present invention, the opening and closing of the one-way valve 142 and the air release valve 152 can be controlled by the ECU (Electronic Control Unit) according to the needs in different situations, so that the flow direction of the air introduced into the heating pipeline 13 can be controlled to achieve different effects. Optionally, remote server control, user terminal control, etc. can also be adopted, and the embodiment of the present invention does not make specific restrictions on this.

[0050] Optionally, at least a portion of a portion of the heating pipeline 133 located in the exhaust pipeline 111 of the three-way catalytic converter 11 is a gradually expanding pipe.

[0051] In the embodiment of the present invention, the gradually diverging pipe refers to a pipe whose pipe area gradually increases. The flow rate of the gas in the gradually diverging pipe will slow down. Among them, the part of the pipe 133 on the heating pipe 13 located in the exhaust pipe 111 of the three-way catalytic converter 11 is at least partially a gradually diverging pipe, which can reduce the flow rate of the air introduced into the heating pipe 13 in the exhaust pipe 111, thereby prolonging the contact time with the high-temperature exhaust gas, further improving the temperature rise effect on the introduced air, or the cooling effect on the high-temperature exhaust gas.

[0052] Optionally, a portion of the heating pipeline 13 located outside the exhaust pipeline 111 of the three-way catalytic converter 11 to the second end of the heating pipeline 13 and at least a portion of the oxygenation pipeline 14 are tapered pipes.

[0053] In the embodiment of the present invention, the tapered pipe is a pipe whose pipe area gradually decreases, and the gas flow rate will become faster in the tapered pipe, wherein the portion of the pipe 134 in the heating pipe 13 located outside the exhaust pipe 111 of the three-way catalytic converter 11 to the second end of the heating pipe 13, and the oxygenation pipe 14, that is, the pipe through which the air introduced into the heating pipe 13 flows in the process of flowing out of the exhaust pipe 111 of the catalyst 11 to flowing into the gasoline engine particulate matter collector 12, at least part of which is a tapered pipe, thereby increasing the flow rate of the heated air, allowing the introduced air to be fully mixed with the high-temperature exhaust gas treated in the gasoline engine particulate matter collector 12, achieving uniform charring and improving the regeneration effect.

[0054] In the embodiments of the present invention, only the aforementioned gradually expanding tube solution may be adopted, only the aforementioned gradually converging tube solution may be adopted, or both the aforementioned gradually expanding tube and gradually converging tube solutions may be adopted simultaneously, so as to improve the exhaust mixing effect while increasing the temperature rise.

[0055] Optionally, the second end 143 of the oxygenation pipeline 14 is connected to the gasoline engine particulate matter collector 12 through a first nozzle and a second nozzle respectively;

[0056] The first nozzle and the second nozzle are radially symmetrically arranged at the inlet of the gasoline engine particulate matter trap 12 .

[0057] In an embodiment of the present invention, more than two nozzles may be provided at the junction of the oxygenation pipeline 14 and the gasoline engine particulate matter collector 12 to enhance the effect of air injection. For example, a first nozzle and a second nozzle may be radially symmetrically provided at the inlet of the gasoline engine particulate matter collector 12, so that during the air injection process, the air injection pressure can be effectively utilized, the air injection can be completed at a high frequency, the air can be injected evenly and fully, the efficiency of removing carbon particles deposited on the surface of the gasoline engine particulate matter collector 12 can be improved, and the exhaust back pressure can be physically reduced to improve fuel utilization. Optionally, the injection frequency is related to parameters such as the high-temperature exhaust flow rate, the air pump speed, and the injection pressure threshold of the air release valve. Those skilled in the art can select a suitable injection frequency according to needs, and the embodiment of the present invention does not impose specific restrictions on this.

[0058] Optionally, an air filter 16 is provided at the first end 131 of the heating pipeline 13 .

[0059] In an embodiment of the present invention, an air filter 16 may also be provided at the first end 131 of the heating pipeline 13, so that the introduced air can be filtered when the air is introduced at the first end 131 to ensure the crystallization of the air introduced into the heating pipeline 13 and avoid the influence of impurities such as pollutants and particulate matter on the post-processing process.

[0060] Optionally, the second end 153 of the cooling pipeline 15 is connected to the outlet of the gasoline engine particulate matter collector 12 .

[0061] In the embodiment of the present invention, the second end 153 of the cooling pipe 15 is used to export air. Optionally, the second end 153 of the cooling pipe 15 can extend out of the vehicle to contact the environment so as to directly export the heated air. Alternatively, the second end 153 of the cooling pipe 15 can also be connected to the outlet of the gasoline engine particulate matter collector 12, so that the heated air is mixed with the high-temperature exhaust gas after catalytic treatment and particulate matter capture and discharged, thereby reducing the number of pipe outlets and simplifying the pipe structure. The embodiment of the present invention does not impose specific restrictions on this.

[0062] The post-treatment pipeline provided in the embodiment of the present invention is applied to the three-way catalytic converter and the gasoline engine particulate matter collector at the post-treatment end, wherein the pipeline includes a heating pipeline, an oxygenation pipeline and a cooling pipeline. The first end of the heating pipeline is used to introduce air, and the second end is connected to the first end of the oxygenation pipeline and the first end of the cooling pipeline respectively, and part of the heating pipeline is located in the exhaust pipeline of the three-way catalytic converter; a one-way valve is provided on the oxygenation pipeline, and the second end of the oxygenation pipeline is connected to the gasoline engine particulate matter collector through a nozzle; an air release valve is provided on the cooling pipeline, and the second end of the cooling pipeline is used to lead out air. Since the exhaust pipeline of the three-way catalytic converter is connected to the vehicle's The engine exhaust pipe is connected, so there is high-temperature exhaust gas from the engine in the exhaust pipe of the three-way catalytic converter. The high-temperature exhaust gas is fully in contact with a part of the heating pipe in the exhaust pipe of the three-way catalytic converter, and the air flowing through the heating pipe is fully heated, thereby ensuring the heating effect of the air. The gas can be controlled by a one-way valve to flow through the oxygenation pipe and filled into the GPF to meet the temperature and oxygen content conditions of the regeneration of the GPF, thereby improving the regeneration efficiency of the GPF; and it can also reduce the temperature of the high-temperature exhaust gas, thereby reducing the temperature of the TWC that receives the high-temperature exhaust gas. The heated air can also be controlled by the bleed valve to flow through the cooling pipe and discharged without affecting the engine emissions.

[0063] Reference Figure 2 , showing a flow chart of steps of a post-processing method for a vehicle, the method is applied to Figure 1 The post-processing pipeline shown is as follows: Figure 2 As shown, the method may include the following steps:

[0064] Step 201: During the operation of a vehicle, obtain the operating parameters of the vehicle.

[0065] In the present invention, the Figure 1 The after-treatment pipeline shown implements a after-treatment method for high-temperature exhaust gas of a vehicle, wherein the operating parameters of the vehicle can be obtained during the operation of the vehicle. The operating parameters refer to parameters that reflect the working conditions of various components during the operation of the vehicle, such as engine intake temperature, engine water temperature, engine speed, etc. related to the engine, and gasoline engine particulate matter filter related to the gasoline engine particulate matter filter inlet temperature, gasoline engine particulate matter filter carbon loading, or three-way catalytic converter related to the three-way catalytic converter measured temperature, three-way catalytic converter estimated temperature, etc. The embodiment of the present invention does not impose specific restrictions on this.

[0066] Step 202: When the operating parameters meet the oxygenation conditions, control the one-way valve to open and the air release valve to close, so that air is introduced from the first end of the heating pipeline, flows to the second end of the heating pipeline, enters the oxygenation pipeline, and is sprayed into the gasoline engine particulate matter collector through the nozzle at the second end of the oxygenation pipeline.

[0067] In the embodiment of the present invention, the oxygenation condition is an operating condition for the situation where the regeneration condition is not met when the gasoline engine particulate matter filter is regenerated. When the operating parameters reflect that the gasoline engine particulate matter filter in the vehicle is in a state where regeneration is required but the temperature, oxygen content and other conditions of regeneration are not met, the one-way valve in the after-treatment pipeline can be controlled to open and the bleed valve can be controlled to close, so that the heating pipeline is connected to the oxygenation pipeline. After the air is introduced from the first end of the heating pipeline, it enters the oxygenation pipeline through the second end of the heating pipeline and is sprayed into the gasoline engine particulate matter filter through the nozzle at the second end of the oxygenation pipeline. In the process of flowing through the heating pipeline, it is fully in contact with the high-temperature exhaust gas in the exhaust pipeline of the three-way catalytic converter for heating.

[0068] Optionally, the operating parameters include engine speed, gasoline engine particulate matter trap carbon load, gasoline engine particulate matter trap inlet temperature, and step 202 includes:

[0069] Step S11: when the engine speed is less than or equal to a speed threshold, and the carbon load of the gasoline engine particulate matter filter is greater than or equal to a carbon load threshold, determining that the operating parameters meet the oxygenation conditions.

[0070] In an embodiment of the present invention, the operating parameters may include engine speed and carbon loading of a gasoline particulate filter, wherein the engine speed is related to the engine load, and thus the oxygen content in the high-temperature exhaust gas may be determined according to the engine load, and the carbon loading of the gasoline particulate filter may determine the deposition of soot particles in the gasoline particulate filter. The carbon loading of the gasoline particulate filter may reflect whether the gasoline particulate filter needs to be regenerated, and thus whether the oxygenation condition is met may be determined according to parameters such as the engine speed and the carbon loading of the gasoline particulate filter. Optionally, the speed threshold, the carbon loading threshold, and the like may be set according to actual needs, component models, and the like, such as the speed threshold may be 4000 rpm, 4200 rpm, 4400 rpm, and the like, and the carbon loading threshold may be any value between 2.0 and 2.5 g / l, such as 2.0, 2.1, 2.2, 2.3, 2.4, and 2.5 g / l. The embodiment of the present invention does not specifically limit the types of operating parameters and thresholds for determining the oxygenation condition.

[0071] Figure 3 is a schematic diagram of engine speed-load distribution provided by an embodiment of the present invention, such as Figure 3 As shown, the area 301 on the left side of the black dotted line is the oxygen filling and carbon removal working area. Outside the area 301, when the engine load exceeds a certain limit, air injection is prohibited to prevent excessive oxygen flow from causing carbon burning and heat release, causing GPF overheating; when the engine speed exceeds a certain limit, air injection is also prohibited to prevent the GPF temperature from being too high, and the large oxygen flow causes carbon burning and heat release, further causing GPF overheating; optionally, the engine load and engine speed range can be set according to the maximum temperature boundary of the GPF inlet temperature, and the embodiment of the present invention does not make specific restrictions on this. In addition, the area 302 on the right side of the black dotted line is the exhaust temperature easily exceeding the limit temperature area. In the area 302, the air release valve is controlled to open to introduce fresh air into the heating pipeline to take away the heat of the high-temperature exhaust gas and reduce its temperature.

[0072] Step S12: determining a target injection frequency according to a first preset relationship between the engine speed and the injection frequency, and determining a target injection coefficient according to a second preset relationship between the gasoline engine particulate matter trap inlet temperature and the injection coefficient.

[0073] In the embodiment of the present invention, when air is sent from the oxygenation pipeline to the gasoline engine particulate matter collector through the nozzle, the injection frequency can be determined according to the engine speed, wherein there is a first preset relationship between the engine speed and the injection frequency, that is, different engine speeds correspond to different injection frequencies of air, and optionally, the injection frequency can be determined according to the volume flow rate of the high-temperature exhaust gas. Figure 4: is a schematic diagram of the first preset relationship between the engine speed and the injection frequency in an embodiment of the present invention, wherein, for example, the injection frequency can make the introduced air flow rate 5% to 35% of the flow rate of the high-temperature exhaust gas; at the same time, as the GPF temperature increases, it is also necessary to appropriately reduce the injection frequency to prevent the carbon burning process from causing the GPF to overheat. Therefore, there is a second preset relationship between the gasoline engine particulate matter filter inlet temperature and the injection coefficient. Figure 5 It is a schematic diagram of the second preset relationship between the gasoline engine particulate matter collector inlet temperature and the injection coefficient in an embodiment of the present invention. When the gasoline engine particulate matter collector inlet temperature reaches 900-1000°C, the injection coefficient returns to 0, that is, no air injection is performed. After obtaining the operating parameters, the target injection frequency can be determined according to the first preset relationship between the engine speed and the injection frequency, and the target injection coefficient can be determined according to the second preset relationship between the gasoline engine particulate matter collector inlet temperature and the injection coefficient.

[0074] Step S13, determining the air injection frequency according to the target injection frequency and the target injection coefficient.

[0075] In the embodiment of the present invention, the target injection frequency can be corrected according to the target injection coefficient, so that the determined air injection frequency has a suitable oxygen flow rate when controlling the air injection, thereby avoiding GPF carbon burning overtemperature.

[0076] Step S14, control the one-way valve to open and the air release valve to close, so that air is introduced from the first end of the heating pipeline, flows to the second end of the heating pipeline, enters the oxygenation pipeline, and is sprayed into the gasoline engine particulate matter collector through the nozzle at the second end of the oxygenation pipeline at the air injection frequency.

[0077] In the embodiment of the present invention, step S14 may correspond to the relevant content of the aforementioned step 202, and will not be described again to avoid repetition.

[0078] Optionally, the operating parameters further include engine intake temperature and engine water temperature, and before step S11, the following steps may be further included:

[0079] Step S21, determining whether the operating parameters meet the oxygenation conditions when the engine is in a non-ignition state, the engine intake temperature corresponds to a preset intake temperature range, the engine water temperature is greater than or equal to a preset water temperature, and the gasoline engine particulate matter filter inlet temperature is less than or equal to a preset inlet temperature.

[0080] In the embodiment of the present invention, the operating parameters may also include engine intake temperature, engine water temperature, etc. Since the TWC cannot be cooled or the GPF cannot be regenerated when the engine is in a specific operating condition, the state of the engine can be judged first. Optionally, when the engine is in a non-ignition state, the engine intake temperature corresponds to a preset range of intake temperature, the engine water temperature is greater than or equal to the preset water temperature, and the gasoline engine particulate matter collector inlet temperature is less than or equal to the preset inlet temperature. It can be considered that the operating condition of the engine at this time does not require the TWC to be in a high temperature state, or the GPF can be regenerated, so as to further determine whether the operating parameters meet the oxygenation conditions, wherein the preset range of intake temperature can be -30°C to 50°C, the preset water temperature can be 75°C, and the preset inlet temperature can be 950°C. Those skilled in the art can set the threshold values ​​according to specific needs, and the embodiment of the present invention does not impose specific restrictions on this.

[0081] Step 203: When the operating parameters do not meet the oxygenation conditions but meet the cooling conditions, control the air release valve to open and the one-way valve to close, so that air is introduced from the first end of the heating pipeline, flows to the second end of the heating pipeline, enters the cooling pipeline, and flows out from the second end of the cooling pipeline.

[0082] In an embodiment of the present invention, when the operating parameters do not meet the oxygenation conditions, it can be further determined whether the operating parameters meet the cooling conditions. The cooling conditions refer to operating conditions where there is an over-temperature risk in the three-way catalytic converter. When the operating parameters reflect that the three-way catalytic converter has an over-temperature risk, the bleed valve can be controlled to open and the one-way valve can be closed, so that air is introduced from the first end of the heating pipeline, flows to the second end of the heating pipeline, enters the cooling pipeline, and flows out from the second end of the cooling pipeline. The introduced air passes through the exhaust pipeline of the three-way catalytic converter in the heating pipeline to cool down the high-temperature exhaust therein, thereby reducing the over-temperature risk of the three-way catalytic converter.

[0083] Optionally, the operating parameters further include a three-way catalyst temperature, and step 203 includes:

[0084] Step S31: When the engine speed is greater than a speed threshold, the carbon load of the gasoline particulate matter trap is less than a carbon load threshold, and the temperature of the three-way catalytic converter is greater than or equal to a temperature threshold, determining that the operating parameters meet the cooling conditions.

[0085] In an embodiment of the present invention, when the engine speed is greater than the speed threshold and the carbon load of the gasoline engine particulate matter filter is less than the carbon load threshold, it can be determined that the operating parameters do not meet the oxygenation conditions. At this time, it can be determined whether the operating parameters meet the cooling conditions based on the three-way catalytic converter temperature. Optionally, the three-way catalytic converter temperature can be the actual measured temperature of the three-way catalytic converter, or it can be an estimated temperature of the three-way catalytic converter, wherein the estimated temperature refers to an over-estimated control form, that is, the estimated temperature of the three-way catalytic converter is higher than the actual measured temperature, so that the cooling protection can be triggered in advance for the over-temperature risk. Optionally, the three-way catalytic converter temperature can be 930°C. The embodiment of the present invention does not specifically limit the numerical value of the three-way catalytic converter temperature.

[0086] Step S32, control the air release valve to open and the one-way valve to close, so that air is introduced from the first end of the heating pipeline, flows to the second end of the heating pipeline, enters the cooling pipeline, and flows out from the second end of the cooling pipeline.

[0087] In the embodiment of the present invention, step S32 may correspond to the relevant description of the aforementioned step 203, and will not be described again to avoid repetition.

[0088] In the embodiment of the present invention, the air release valve may be opened or closed under the control of the ECU, or may be automatically opened or closed for air release according to the pipeline pressure, and the embodiment of the present invention does not impose any specific limitation on this.

[0089] The post-treatment method provided in the embodiment of the present invention is applied to a post-treatment pipeline, wherein the post-treatment pipeline is applied to a three-way catalytic converter and a gasoline engine particulate matter collector at the post-treatment end, and includes a heating pipeline, an oxygenation pipeline and a cooling pipeline. The first end of the heating pipeline is used to introduce air, and the second end is connected to the first end of the oxygenation pipeline and the first end of the cooling pipeline respectively, and part of the heating pipeline is located in the exhaust pipeline of the three-way catalytic converter; a one-way valve is provided on the oxygenation pipeline, and the second end of the oxygenation pipeline is connected to the gasoline engine particulate matter collector through a nozzle; an air release valve is provided on the cooling pipeline, and the second end of the cooling pipeline is used to lead out air. Since the exhaust pipeline of the three-way catalytic converter is connected to the engine exhaust pipe of the vehicle, high temperature of the engine exists in the exhaust pipeline of the three-way catalytic converter. Exhaust, through the high-temperature exhaust gas and the partial heating pipeline in the exhaust pipe of the three-way catalytic converter, the air flowing through the heating pipeline is fully heated, thereby ensuring the heating effect of the air, and when the operating parameters of the vehicle meet the oxygenation conditions, the one-way valve can be controlled to open and the bleed valve can be controlled to close so that the gas can be controlled by the one-way valve to flow through the oxygenation pipeline and be charged into the GPF to meet the temperature and oxygen content conditions of the regeneration of the GPF, thereby improving the regeneration efficiency of the GPF; when the operating parameters of the vehicle meet the cooling conditions, the bleed valve can be controlled to open and the one-way valve can be controlled to close, and the heated air can take away the heat of the high-temperature exhaust through the heating pipeline and then flow through the cooling pipeline to be discharged, thereby also reducing the temperature of the high-temperature exhaust, and then reducing the temperature of the TWC receiving the high-temperature exhaust, without affecting the engine emissions.

[0090] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0091] It will be appreciated by those skilled in the art that the embodiments of the present invention may be provided as methods, devices, or computer program products. Therefore, the embodiments of the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the embodiments of the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0092] In a typical configuration, the computer device includes one or more processors (CPU), input / output interfaces, network interfaces and memory. Memory may include non-permanent memory in computer-readable media, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. Memory is an example of a computer-readable medium. Computer-readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer-readable instructions, data structures, modules of programs or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. According to the definition in this article, computer-readable media does not include non-transitory media such as modulated data signals and carrier waves.

[0093] The embodiments of the present invention are described with reference to the flowcharts and / or block diagrams of the methods, terminal devices (systems), and computer program products according to the embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of the processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing terminal device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing terminal device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0094] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing terminal device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0095] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal device so that a series of operating steps are executed on the computer or other programmable terminal device to produce a computer-implemented process, thereby providing instructions for executing on the computer or other programmable terminal device to implement the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0096] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0097] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0098] The above is a detailed introduction to a driving condition construction method and a driving condition construction device provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for general technical personnel in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A post-processing pipeline of a vehicle, the post-processing pipeline is applied to a post-processing end, the post-processing end includes a three-way catalytic converter and a gasoline engine particulate matter collector, the exhaust pipeline of the three-way catalytic converter is connected to the engine exhaust pipe of the vehicle, characterized in that: The post-processing pipeline includes a heating pipeline, an oxygenation pipeline and a cooling pipeline; The first end of the heating pipeline is used to introduce air, the second end of the heating pipeline is connected to the first end of the oxygenation pipeline and the first end of the cooling pipeline respectively, and part of the heating pipeline is located in the exhaust pipeline of the three-way catalytic converter; A one-way valve is provided on the oxygen filling pipeline, and the second end of the oxygen filling pipeline is connected to the gasoline engine particulate matter collector through a nozzle; The cooling pipeline is provided with an air release valve, and the second end of the cooling pipeline is used for extracting air.

2. The post-processing pipeline according to claim 1, characterized in that: At least part of the heating pipeline located in the exhaust pipeline of the three-way catalytic converter is a gradually expanding pipe.

3. The post-processing pipeline according to claim 1, characterized in that: The portion of the heating pipeline located outside the exhaust pipeline of the three-way catalytic converter to the second end of the heating pipeline and at least a portion of the oxygenation pipeline are tapered pipes.

4. The post-processing pipeline according to claim 1, characterized in that: The second end of the oxygenation pipeline is connected to the gasoline engine particulate matter collector through the first nozzle and the second nozzle respectively; The first nozzle and the second nozzle are radially symmetrically arranged at the inlet of the gasoline engine particulate matter collector.

5. The post-processing pipeline according to claim 1, characterized in that: An air filter is arranged at the first end of the heating pipeline.

6. The post-processing pipeline according to claim 1, characterized in that: The second end of the cooling pipeline is connected to the outlet of the gasoline engine particulate matter collector.

7. A post-processing method for a vehicle, characterized in that: The method is applied to the post-processing pipeline according to any one of claims 1 to 6, and the method comprises: During the operation of the vehicle, obtaining the operation parameters of the vehicle; When the operating parameters meet the oxygenation condition, the one-way valve is controlled to open and the air release valve is closed, so that air is introduced from the first end of the heating pipeline, flows to the second end of the heating pipeline, enters the oxygenation pipeline, and is sprayed into the gasoline engine particulate matter collector through the nozzle at the second end of the oxygenation pipeline; When the operating parameters do not meet the oxygenation conditions but meet the cooling conditions, the air release valve is controlled to open and the one-way valve is closed, so that air is introduced from the first end of the heating pipeline, flows to the second end of the heating pipeline, enters the cooling pipeline, and flows out from the second end of the cooling pipeline.

8. The method according to claim 7, characterized in that The operating parameters include engine speed, carbon load of gasoline engine particulate matter trap, and gasoline engine particulate matter trap inlet temperature. When the operating parameters meet the oxygenation condition, the one-way valve is controlled to be opened and the air release valve is closed, so that air is introduced from the first end of the heating pipeline, flows to the second end of the heating pipeline, enters the oxygenation pipeline, and is sprayed into the gasoline engine particulate matter trap through the nozzle at the second end of the oxygenation pipeline, including: When the engine speed is less than or equal to the speed threshold, and the carbon load of the gasoline engine particulate matter trap is greater than or equal to the carbon load threshold, determining that the operating parameters meet the oxygenation condition; Determine the target injection frequency according to a first preset relationship between the engine speed and the injection frequency, and determine the target injection coefficient according to a second preset relationship between the gasoline engine particulate matter trap inlet temperature and the injection coefficient; Determining the air injection frequency according to the target injection frequency and the target injection coefficient; The one-way valve is controlled to open and the air release valve is controlled to close, so that air is introduced from the first end of the heating pipeline, flows to the second end of the heating pipeline, enters the oxygenation pipeline, and is sprayed into the gasoline engine particulate matter collector through the nozzle at the second end of the oxygenation pipeline at the air injection frequency.

9. The method according to claim 8, characterized in that The operating parameters also include engine intake temperature and engine water temperature. When the engine speed is less than or equal to the speed threshold, and the carbon load of the gasoline engine particulate matter trap is greater than or equal to the carbon load threshold, before determining that the operating parameters meet the oxygenation conditions, the following is further included: When the engine is in a non-ignition state, the engine intake temperature corresponds to a preset intake temperature range, the engine water temperature is greater than or equal to the preset water temperature, and the gasoline engine particulate matter collector inlet temperature is less than or equal to the preset inlet temperature, determine whether the operating parameters meet the oxygenation conditions.

10. The method according to claim 8, characterized in that The operating parameters also include a temperature of the three-way catalytic converter. When the operating parameters do not meet the oxygenation condition but meet the cooling condition, the air release valve is controlled to be opened and the one-way valve is closed, so that air is introduced from the first end of the heating pipeline, flows to the second end of the heating pipeline, enters the cooling pipeline, and flows out from the second end of the cooling pipeline, including: When the engine speed is greater than a speed threshold, the carbon load of the gasoline engine particulate matter trap is less than a carbon load threshold, and the temperature of the three-way catalytic converter is greater than or equal to a temperature threshold, determining that the operating parameters meet the cooling condition; The air release valve is controlled to open and the one-way valve is controlled to close, so that air is introduced from the first end of the heating pipeline, flows to the second end of the heating pipeline, enters the cooling pipeline, and flows out from the second end of the cooling pipeline.

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