Control method and related device of non-cooled EGR system

Abstract

The present application discloses a control method and related device for a non-cooled EGR system, and relates to the field of vehicle technology. The method includes that when the present application detects that the engine is in a low exhaust temperature state, the opening of the supercharger bleed valve will be increased, and the exhaust gas of the engine will not flow through the turbine but directly enter the post-processing module by using the supercharger bleed valve, so that the post-processing module directly obtains more exhaust gas from the engine, thereby increasing the temperature of the post-processing module. Then, based on the opening of the supercharger bleed valve, the opening of the temperature-raising valve is reduced to increase the pressure difference between the temperature-raising valve and the EGR air intake side, and reduce the amount of engine exhaust entering the turbine. Based on the opening of the supercharger bleed valve and the opening of the temperature-raising valve, the opening of the EGR valve is adjusted so that the opening of the EGR valve is not less than the opening of the EGR valve in the non-low exhaust temperature state, so as to increase the amount of engine exhaust flowing through the EGR valve, thereby reducing the amount of engine exhaust entering the turbine, increasing the amount of exhaust entering the engine, and optimizing the emission of NOx.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and more specifically, to a control method and related devices for a non-cooled EGR system. Background Art

[0002] In modern engine technology, with increasingly stringent emission regulations, the control requirements for nitrogen oxide (NOx) emissions have reached an unprecedented level. During the operation of the engine, the engine faces huge emission control challenges. Although the traditional EGR (exhaust gas recirculation) system plays an important role in reducing NOx emissions, it cannot increase the temperature of the aftertreatment during the cold start phase or long reverse towing conditions, thereby affecting the efficiency of the aftertreatment and increasing the emission of nitrogen oxides. Summary of the invention

[0003] In view of the above problems, this application is proposed to provide a control method and related device of a non-cooled EGR system to improve the performance of the post-processing module. The specific solution is as follows:

[0004] In a first aspect, a control method for a non-cooled EGR system, the non-cooled EGR system comprising a turbocharger bleed valve, an EGR valve and a temperature raising valve of a turbine, one end of the turbocharger bleed valve being located between an engine exhaust side and a front end of the turbine, and the other end being located between a rear end of the turbine and a front end of a post-processing module, the turbocharger bleed valve being used to allow the exhaust gas of the engine to directly enter the post-processing module without passing through the turbine, the post-processing module being used to process the exhaust gas of the engine, the temperature raising valve being located between a rear end of an EGR air intake side and a front end of the turbine, and the EGR valve being located at a front end of the EGR air intake side, the method comprising:

[0005] Monitor the emission status of the engine;

[0006] determining whether the emission state of the engine is in a low exhaust temperature state;

[0007] If yes, determining a first target opening of the supercharger bleed valve, and adjusting the opening of the supercharger bleed valve to the first target opening, wherein the first target opening is greater than the opening of the supercharger bleed valve in a non-low exhaust temperature state;

[0008] Determining a second target opening of the temperature-raising valve based on a first target opening of the supercharger purge valve, and adjusting the opening of the temperature-raising valve to the second target opening, wherein the second target opening is smaller than the opening of the temperature-raising valve in a non-low exhaust temperature state;

[0009] A third target opening of the EGR valve is determined based on the first target opening and the second target opening, and the opening of the EGR valve is adjusted to the third target opening, which is not less than the opening of the EGR valve in a non-low exhaust temperature state.

[0010] In one possible design, in another implementation of the first aspect of the embodiment of the present application, the low exhaust temperature state includes a cold start phase and a long reverse towing condition.

[0011] In one possible design, in another implementation of the first aspect of the embodiment of the present application, the process of determining the third target opening of the EGR valve based on the first target opening and the second target opening includes:

[0012] determining a correction opening of the EGR valve based on the first target opening and the second target opening;

[0013] A third target opening degree of the EGR valve is determined based on the correction opening degree.

[0014] In a possible design, in another implementation of the first aspect of the embodiment of the present application, the process of determining whether the emission state of the engine is in a low exhaust temperature state includes:

[0015] It is determined whether the exhaust temperature of the engine at the current moment is lower than a preset exhaust temperature limit value. If so, the exhaust state of the engine is in the cold start stage.

[0016] In a possible design, in another implementation of the first aspect of the embodiment of the present application, the process of determining whether the emission state of the engine is in a low exhaust temperature state includes:

[0017] It is determined whether the cyclic fuel injection amount of the engine is lower than a preset fuel amount limit, and whether the time lower than the preset fuel amount limit reaches a preset time length. If so, the emission state of the engine is in the long reverse drag condition.

[0018] In a possible design, in another implementation of the first aspect of the embodiment of the present application, when the emission state of the engine is in the cold start stage, the process of determining the first target opening of the supercharger purge valve includes:

[0019] Obtaining a first speed and a first cycle fuel injection amount of the engine;

[0020] The first target opening corresponding to the first speed and the first cyclic injection amount is determined according to a configured two-dimensional heating opening table, wherein the two-dimensional heating opening table records the corresponding relationship between the speed, the cyclic injection amount and the opening of the supercharger exhaust valve during the cold start phase.

[0021] In a possible design, in another implementation of the first aspect of the embodiment of the present application, when the emission state of the engine is in the long reverse drag condition, the process of determining the first target opening of the supercharger purge valve includes:

[0022] The first target opening of the supercharger purge valve is determined to be fully open.

[0023] In a possible design, in another implementation of the first aspect of the embodiment of the present application, the process of determining the second target opening of the temperature raising valve based on the first target opening of the supercharger air release valve includes:

[0024] The second target opening of the temperature raising valve corresponding to the first target opening is determined according to the configured one-dimensional opening table, wherein the one-dimensional opening table records the corresponding relationship between the opening of the supercharger bleed valve and the opening of the temperature raising valve under the low exhaust temperature state.

[0025] In one possible design, in another implementation of the first aspect of the embodiment of the present application, the process of determining the corrected opening of the EGR valve based on the first target opening and the second target opening includes:

[0026] Obtain the configured two-dimensional opening correction table, and determine the corrected opening of the EGR valve corresponding to the first target opening and the second target opening according to the two-dimensional opening correction table, wherein the two-dimensional opening correction table records the corresponding relationship between the opening of the supercharger bleed valve, the opening of the temperature raising valve and the corrected opening of the EGR valve under the low exhaust temperature state.

[0027] In a possible design, in another implementation of the first aspect of the embodiment of the present application, the process of determining the third target opening of the EGR valve based on the corrected opening and adjusting the opening of the EGR valve to the third target opening includes:

[0028] Acquire a second speed and a second cycle fuel injection amount of the engine;

[0029] Determining a first basic set opening of the EGR valve corresponding to the second speed and the second cycle injection amount according to a configured two-dimensional EGR valve basic opening table, wherein the two-dimensional EGR valve basic opening table records the corresponding relationship between the speed, the cycle injection amount and the opening of the EGR valve in the non-low exhaust temperature state;

[0030] The third target opening is determined according to the first basic setting opening and the corrected opening, and the opening of the EGR valve is adjusted from the first basic setting opening to the third target opening, wherein the third target opening is not less than the first basic setting opening.

[0031] In a possible design, another implementation of the first aspect of the embodiment of the present application further includes:

[0032] If the emission state of the engine is not in the low exhaust temperature state, obtaining a third speed and a third cycle fuel injection amount of the engine;

[0033] Determining a second basic setting opening of the supercharger bleed valve corresponding to the third speed and the third cyclic injection amount according to a configured two-dimensional basic setting opening table, wherein the two-dimensional basic setting opening table records the corresponding relationship between the speed, the cyclic injection amount and the opening of the supercharger bleed valve in a non-low exhaust temperature state;

[0034] The opening of the supercharger purge valve is adjusted to the second basic set opening, the opening of the EGR valve is adjusted to be fully opened, and the opening of the temperature raising valve is adjusted to be fully opened.

[0035] In a second aspect, a control device for a non-cooled EGR system is provided, comprising:

[0036] A condition monitoring unit, used to monitor the emission status of the engine;

[0037] A state judgment unit, used to judge whether the emission state of the engine is in a low exhaust temperature state;

[0038] a supercharger purge valve opening determination unit, configured to determine a first target opening of the supercharger purge valve when the exhaust state of the engine is in a low exhaust temperature state, and adjust the opening of the supercharger purge valve to the first target opening, wherein the first target opening is greater than the opening of the supercharger purge valve in a non-low exhaust temperature state;

[0039] a temperature-raising valve opening determination unit, configured to determine a second target opening of the temperature-raising valve based on a first target opening of the supercharger exhaust valve, and adjust the opening of the temperature-raising valve to the second target opening, wherein the second target opening is smaller than the opening of the temperature-raising valve in a non-low exhaust temperature state;

[0040] An EGR valve opening determination unit is used to determine a third target opening of the EGR valve based on the first target opening and the second target opening, and adjust the opening of the EGR valve to the third target opening, wherein the third target opening is not less than the opening of the EGR valve in a non-low exhaust temperature state.

[0041] In a third aspect, a vehicle is provided, comprising: a non-cooled EGR system and a controller, wherein the controller is used to implement the various steps of the control method of the non-cooled EGR system described in any one of the first aspects of the present application.

[0042] By means of the above technical scheme, the present application proposes a control method for a non-cooled EGR system. When the present application detects that the engine is in a low exhaust temperature state, the opening of the supercharger bleed valve is increased, and the exhaust gas of the engine is directly fed into the post-processing module without passing through the turbine by means of the supercharger bleed valve, so that the post-processing module directly obtains more exhaust gas of the engine, thereby increasing the temperature of the post-processing module. Then, based on the opening of the supercharger bleed valve, the opening of the temperature-raising valve is reduced to increase the pressure difference between the temperature-raising valve and the EGR air intake side, reduce the amount of engine exhaust gas entering the turbine, thereby reducing the power of the turbine, reducing the intake amount of the engine, and reducing the emission of NOx. Based on the opening of the supercharger bleed valve and the opening of the temperature-raising valve, the opening of the EGR valve is adjusted so that the opening of the EGR valve is not less than the opening of the EGR valve in the non-low exhaust temperature state, so as to increase the amount of engine exhaust gas flowing through the EGR valve, thereby reducing the amount of engine exhaust gas entering the turbine, increasing the amount of exhaust gas entering the engine, and optimizing the emission of NOx. Through the cooperation of the turbocharger bleed valve, temperature raising valve and EGR valve, the efficiency of post-treatment is improved and NOx emissions are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0044] Figure 1 A schematic diagram of the structure of a non-cooled EGR system provided in an embodiment of the present application;

[0045] Figure 2 A flow chart of a control method for a non-cooled EGR system provided in an embodiment of the present application;

[0046] Figure 3 A schematic diagram of a working process of an engine in a cold start phase provided in an embodiment of the present application;

[0047] Figure 4 A schematic diagram of a working process of an engine in a long reverse towing condition provided in an embodiment of the present application;

[0048] Figure 5 A schematic diagram of the structure of a control device for a non-cooled EGR system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0049] Before introducing this application solution, the English and related concepts involved in this article are first explained:

[0050] EGR (Exhaust Gas Recirculation): A product that recirculates a part of the engine's exhaust gas back into the cylinders, mixes it with the engine's fresh intake air, to improve the engine's operating efficiency, improve the combustion environment, reduce the engine load, reduce the emissions of NOx compounds, reduce knocking, and extend the service life of each component.

[0051] Turbine: A turbine is a device that uses the kinetic energy or thermal energy of a fluid (such as a gas or liquid) to drive rotating blades to generate mechanical energy. In the turbocharging system of an automotive engine, the turbine is one of the core components of the turbocharger. When the engine is operating, high-temperature and high-speed exhaust gas is discharged from the engine exhaust pipe, impacting the blades of the turbine and causing it to rotate at high speed. The rotation of the turbine is connected to a compressor through a shaft, thereby driving the compressor blades to rotate, compressing fresh air and sending it into the engine cylinders. In this way, the turbocharger can increase the engine's intake air volume, thereby improving the engine's power and efficiency. Simply put, the turbine plays a role in converting the energy of the exhaust gas into mechanical energy in the engine system and is a key component for realizing the turbocharging function.

[0052] Cold start phase: Refers to the initial stage when the engine starts and operates from a stationary state in a low-temperature environment. Due to the relatively low exhaust temperature, the injection start time of the urea injection system (for exhaust gas treatment) is relatively late, resulting in difficulty in effectively treating pollutants such as nitrogen oxides (NOx) in the exhaust gas at low temperatures, thus causing difficulties in high-cycle emission control.

[0053] Long reverse-dragging working condition: Refers to a special working condition in which, during the operation of the vehicle, due to the inertial effect of the vehicle or other power inputs (such as downhill coasting, vehicle being towed, etc.), the engine's crankshaft is driven to rotate in the reverse direction. In this case, no fuel injection occurs in the engine cylinders, but the pistons still reciprocate in the cylinders, and the gas in the cylinders is compressed and expanded, but no heat is generated by fuel combustion, resulting in a decrease in combustion efficiency and thus a relatively large peak emission of nitrogen oxides (NOx).

[0054] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the scope of protection of the present application.

[0055] The present application provides a control method for a non-cooled EGR system. When the engine is detected to be in a low exhaust temperature state, the opening of the supercharger bleed valve is increased, and the supercharger bleed valve is used to allow the engine exhaust to directly enter the post-processing module without passing through the turbine, so that the post-processing module directly obtains more engine exhaust, thereby increasing the temperature of the post-processing module. Then, based on the opening of the supercharger bleed valve, the opening of the temperature-raising valve is reduced to increase the pressure difference between the temperature-raising valve and the EGR air intake side, and reduce the engine exhaust gas entering the turbine. Based on the opening of the supercharger bleed valve and the opening of the temperature-raising valve, the opening of the EGR valve is adjusted so that the opening of the EGR valve is not less than the opening of the EGR valve in the non-low exhaust temperature state, so as to increase the engine exhaust gas flowing through the EGR valve, thereby reducing the engine exhaust gas entering the turbine, increasing the exhaust gas entering the engine, and reducing the engine exhaust gas. Through the cooperation of the supercharger bleed valve, the temperature-raising valve and the EGR valve, the efficiency of post-processing is improved and the emission of NOx is reduced.

[0056] In this embodiment, the non-cooled EGR system includes a turbocharger bleed valve, an EGR valve and a temperature raising valve of the turbine, see Figure 1 , Figure 1 A schematic diagram of the structure of a non-cooled EGR system provided in an embodiment of the present application is provided. Next, the structure of the non-cooled EGR system is introduced in detail.

[0057] Depend on Figure 1 It can be seen that one end of the turbocharger bleed valve is located between the engine exhaust side and the front end of the turbine, and the other end is located between the rear end of the turbine and the front end of the after-treatment module. The turbocharger bleed valve is responsible for bypassing the engine's exhaust gas from the turbine and directly introducing it into the after-treatment module, so as to reduce the energy input of the turbine and the intake volume under specific working conditions (such as long reverse towing conditions or cold start phase), thereby slowing down the rate of temperature drop of the engine.

[0058] The EGR valve is located at the front end of the EGR intake side and is used to control the flow rate of exhaust gas recirculation. By adjusting the opening of the EGR valve, a portion of the exhaust gas can be reintroduced into the engine's intake system and mixed with fresh air before entering the cylinder, thereby reducing the combustion temperature and reducing the generation of nitrogen oxides (NOx). In addition, the adjustment of the EGR valve can also reduce the intake volume by increasing the amount of exhaust gas recirculation, further increasing the exhaust temperature, and helping to improve the conversion efficiency of the post-processing module.

[0059] The temperature-raising valve is located between the rear end of the EGR intake side and the front end of the turbine. Its function is to control the intake volume by adjusting the opening, thereby optimizing the engine combustion process. Under certain conditions, by properly closing the temperature-raising valve, the EGR driving pressure difference can be increased, the exhaust gas recirculation rate can be increased, and NOx emissions can be further reduced.

[0060] The non-cooled EGR system also includes an engine and an aftertreatment module. The engine may include multiple cylinders. Figure 1 The engine shown in the figure includes four cylinders, of which cylinders 1 and 2 can exhaust from the left exhaust side of the engine, and cylinders 3 and 4 can exhaust from the right exhaust side of the engine. The aftertreatment module is used to treat the exhaust of the engine to reduce the content of nitrogen oxides. The non-cooled EGR system can also include components such as the engine exhaust side, the EGR cooler and the engine intake side.

[0061] In this embodiment, the design of the entire non-cooled EGR system can quickly increase the after-treatment temperature, reduce the original exhaust NOx level, and improve the after-treatment conversion efficiency to meet more stringent emission requirements during the cold start low temperature stage or long reverse towing conditions when the exhaust temperature is low and emission control is difficult, through the coordinated control of the supercharger bleed valve, EGR valve and temperature raising valve, so as to meet more stringent emission requirements.

[0062] Next, see Figure 2 , Figure 2 A flow chart of a control method for a non-cooled EGR system provided in an embodiment of the present application is provided. The control method for a non-cooled EGR system of the present application is applied to a vehicle controller, as described below, and specifically includes the following steps:

[0063] Step S100: monitor the emission status of the engine.

[0064] Specifically, the engine parameters are monitored in real time, and the parameters are used to lay the foundation for subsequent engine status judgment. Through monitoring and judgment, the engine status is accurately identified, thereby providing a basis for subsequent control strategies, thereby achieving effective management and optimization of engine emissions.

[0065] Step S110, determining whether the emission state of the engine is in a low exhaust temperature state, if so, executing step S120.

[0066] Specifically, in order to determine whether the emission state of the engine is in a low exhaust temperature state, the parameters of the engine are monitored in real time. When it is detected that the parameters reach the preset parameter limit, it is determined that the engine is in a low exhaust temperature state, and step S120 is executed.

[0067] Step S120, determining a first target opening of the supercharger purge valve, and adjusting the opening of the supercharger purge valve to the first target opening.

[0068] Specifically, if it is detected that the emission state of the engine is in a low exhaust temperature state, a first target opening of the supercharger bleed valve will be further determined, and the opening of the supercharger bleed valve will be adjusted to the first target opening, which is greater than the opening of the supercharger bleed valve in a non-low exhaust temperature state, so as to reduce the operating efficiency of the turbine and the fresh air intake of the engine by increasing the bleed amount of the supercharger bleed valve, thereby increasing the exhaust temperature and optimizing emission control.

[0069] Step S130: determining a second target opening of the temperature raising valve based on the first target opening of the supercharger purge valve, and adjusting the opening of the temperature raising valve to the second target opening.

[0070] Specifically, after determining the first target opening of the supercharger bleed valve, the second target opening of the temperature-raising valve will be further determined based on the first target opening. Subsequently, the opening of the temperature-raising valve is adjusted to the second target opening. The adjustment strategy of the temperature-raising valve opening is based on the demand for engine heat management in the low exhaust temperature state. The second target opening is smaller than the opening of the temperature-raising valve in the non-low exhaust temperature state, which can reintroduce more engine exhaust gas into the engine, better coordinate the engine's intake volume and exhaust temperature, and thus optimize emission control.

[0071] Step S140: Determine a third target opening of the EGR valve based on the first target opening and the second target opening, and adjust the opening of the EGR valve to the third target opening.

[0072] Specifically, after adjusting the openings of the supercharger bleed valve and the temperature raising valve, the third target opening of the EGR valve will be further determined according to the first target opening of the supercharger bleed valve and the second target opening of the temperature raising valve. Subsequently, the opening of the EGR valve is adjusted to the third target opening. Among them, the third target opening is not less than the opening of the EGR valve under the non-low exhaust temperature state. The adjustment strategy of the opening of the EGR valve is to better coordinate the exhaust gas recirculation amount of the engine under the low exhaust temperature state, so as to ensure that the combustion process can be optimized by increasing the exhaust gas recirculation amount under low temperature conditions, thereby increasing the exhaust temperature and reducing NOx emissions.

[0073] The control method of a non-cooled EGR system proposed in this embodiment increases the opening of the supercharger bleed valve when detecting that the engine is in a low exhaust temperature state, and uses the supercharger bleed valve to allow the engine exhaust to flow directly into the post-processing module without passing through the turbine, so that the post-processing module directly obtains more engine exhaust, thereby increasing the temperature of the post-processing module. Then, based on the opening of the supercharger bleed valve, the opening of the temperature-raising valve is reduced to increase the pressure difference between the temperature-raising valve and the EGR air intake side, reduce the engine exhaust volume entering the turbine, thereby reducing the power of the turbine, reducing the engine intake volume, and reducing the NOx emission. Based on the opening of the supercharger bleed valve and the opening of the temperature-raising valve, the opening of the EGR valve is adjusted so that the opening of the EGR valve is not less than the opening of the EGR valve in the non-low exhaust temperature state, so as to increase the engine exhaust volume flowing through the EGR valve, thereby reducing the engine exhaust volume entering the turbine, increasing the exhaust volume entering the engine, reducing the engine intake volume, and optimizing the NOx emission. Through the cooperation of the turbocharger bleed valve, temperature raising valve and EGR valve, the efficiency of post-treatment is improved and NOx emissions are reduced.

[0074] Furthermore, in an embodiment of the present application, the low exhaust temperature state of the engine may include a cold start phase and a long reverse towing condition, and the process of determining whether the emission state of the engine is in a low exhaust temperature state in step S110 in the aforementioned embodiment may be described in detail.

[0075] An optional method is to monitor the exhaust temperature of the engine at the current moment to determine whether it is lower than a preset exhaust temperature limit. If the exhaust temperature at the current moment is lower than the limit, it can be determined that the emission state of the engine is in the cold start stage, and corresponding control measures need to be taken to optimize emissions.

[0076] Another optional method is to monitor the engine's cyclic injection volume and determine whether it is lower than the preset fuel volume limit. If the cyclic injection volume is lower than the preset fuel volume limit and this state lasts for a preset time, it can be determined that the engine's emission state is in a long reverse drag condition. In this condition, the engine does not inject fuel for a long time, resulting in a rapid drop in temperature, and measures need to be taken to optimize emissions.

[0077] In this embodiment, by monitoring the exhaust temperature and the cyclic injection amount, it is identified whether the engine is in the cold start stage or the long reverse towing condition, thereby avoiding control strategy errors caused by misjudgment of the working conditions, improving reliability and adaptability, and after identifying the low exhaust temperature state, targeted control measures can be taken according to different working conditions, laying the foundation for subsequent control measures.

[0078] Further, in the embodiments of the present application, the process of determining the third target opening of the EGR valve based on the first target opening and the second target opening in step S140 in the aforementioned embodiment may be described in detail.

[0079] In an optional manner, after determining the first target opening of the supercharger purge valve and the second target opening of the temperature raising valve, the third target opening of the EGR valve may be further calculated. The specific process is as follows:

[0080] First, a modified opening of the EGR valve is calculated based on the first target opening of the turbocharger purge valve and the second target opening of the temperature-raising valve. The modified opening is based on a comprehensive consideration of the intake air volume and exhaust temperature under the current operating conditions and is used to adjust the opening of the EGR valve to optimize the combustion process and emission control of the engine. Then, based on the modified opening, the third target opening of the EGR valve is further determined.

[0081] The third target opening in this embodiment takes into account the actual needs of the engine under low exhaust temperature conditions, ensuring that the exhaust temperature is increased while optimizing emissions, thereby better meeting the requirements of emission regulations.

[0082] Furthermore, in this embodiment, the determination of the target opening degree of the EGR valve when the engine is in a low exhaust temperature state may be described in detail.

[0083] An optional way is to directly determine the third target opening of the EGR valve through the first target opening of the supercharger bleed valve and the second target opening of the temperature raising valve. That is, after determining the first target opening of the supercharger bleed valve and the second target opening of the temperature raising valve, a pre-configured two-dimensional EGR valve third target opening table will be obtained. The two-dimensional EGR valve third target opening table records the correspondence between the opening of the supercharger bleed valve, the opening of the temperature raising valve and the third target opening of the EGR valve under low exhaust temperature conditions. Among them, the two-dimensional EGR valve third target opening table is used to determine the optimal opening of the EGR valve under low exhaust temperature conditions. The creation of the two-dimensional EGR valve third target opening table may involve a series of experiments and theoretical calculations. Optionally, the influence of the openings of different supercharger bleed valves and temperature raising valves on the performance of the EGR valve can be measured. The opening of the EGR valve is adjusted to the target opening at different openings of the supercharger bleed valve and the temperature raising valve to ensure that under low exhaust temperature conditions, a portion of the exhaust gas can be effectively reintroduced into the engine's intake system to reduce the generation of NOx.

[0084] Another optional method is to first determine the corrected opening of the EGR valve by the first target opening of the supercharger bleed valve and the second target opening of the temperature raising valve, and then use the corrected opening to determine the opening of the EGR valve. Optionally, after determining the first target opening of the supercharger bleed valve and the second target opening of the temperature raising valve, a pre-configured two-dimensional opening correction table will be obtained. According to the determined first target opening and second target opening, the corresponding EGR valve corrected opening is searched in the two-dimensional opening correction table. Then, according to the EGR valve corrected opening, the third target opening of the EGR valve is determined, and the opening of the EGR valve is adjusted to the third target opening. The two-dimensional opening correction table records the corresponding relationship between different opening combinations of the supercharger bleed valve and the temperature raising valve and the corrected opening of the EGR valve under low exhaust temperature conditions, so as to ensure that in the case of the first target opening and the second target opening, by determining the correction angle of EGR, a part of the exhaust gas is more effectively reintroduced into the intake system of the engine.

[0085] In another optional way, the correction opening of the EGR valve can be determined by the first target opening of the supercharger bleed valve and the second target opening of the temperature raising valve, and then the first basic setting opening of the EGR valve can be determined. The first basic setting opening is then adjusted by using the correction opening to determine the third target opening of the EGR valve. Optionally, a pre-configured two-dimensional opening correction table is first obtained. The two-dimensional opening correction table records the corresponding relationship between the opening of the supercharger bleed valve, the opening of the temperature raising valve and the correction opening of the EGR valve under low exhaust temperature conditions. According to the determined first target opening and second target opening, the corresponding EGR valve correction opening is searched in the two-dimensional opening correction table. Then, the current speed of the engine (recorded as the second speed) and the current cycle injection amount (recorded as the second cycle injection amount) are obtained. According to the configured two-dimensional EGR valve basic opening table, the first basic setting opening of the EGR valve corresponding to the second speed and the second cycle injection amount is determined. The two-dimensional EGR valve basic opening table records the corresponding relationship between the speed, the circulating injection amount and the opening of the EGR valve under non-low exhaust temperature conditions. Finally, the third target opening of the EGR valve will be determined by combining the first basic setting opening and the corrected opening, and the opening of the EGR valve will be adjusted from the first basic setting opening to the third target opening. Among them, the third target opening is not less than the first basic setting opening to ensure that the combustion process can be optimized and NOx emissions can be reduced by increasing the exhaust gas recirculation amount under low exhaust temperature conditions.

[0086] In this embodiment, the EGR valve opening is adjusted by the above-mentioned multiple optional methods, which can effectively optimize the combustion process and emission control of the engine under low exhaust temperature conditions. The first method directly determines the third target opening of the EGR valve through the two-dimensional EGR valve third target opening table, simplifies the control process, and improves the response speed and control accuracy of the system. The second method first determines the corrected opening of the EGR valve, and then uses the corrected opening to determine the third target opening, which increases the flexibility of control and can better adapt to the emission requirements under different working conditions. The third method combines the current speed of the engine and the cycle injection amount, further refines the adjustment strategy of the EGR valve opening, and ensures that the combustion process is optimized by increasing the exhaust gas recirculation amount under low exhaust temperature conditions, and reduces nitrogen oxide (NOx) emissions. The emission control performance of the engine under low exhaust temperature conditions such as cold start and long reverse drag is improved, the adaptability and reliability of the system are enhanced, and strong technical support is provided to meet more stringent emission regulations.

[0087] Further, the process of determining the first target opening of the supercharger air release valve in step S110 in the aforementioned embodiment and adjusting the opening of the supercharger air release valve to the first target opening can be described in detail.

[0088] In an optional manner, when the emission state of the engine is in the cold start stage, the following steps may be performed to determine and adjust the first target opening of the supercharger purge valve:

[0089] First, the current engine speed (recorded as the first speed) and the current cycle injection amount (recorded as the first cycle injection amount) are obtained. The above parameters are key indicators for judging the engine operating state and can reflect the actual working conditions of the engine during the cold start stage.

[0090] Next, the first target opening is determined according to the configured two-dimensional heating opening table. The two-dimensional heating opening table records the corresponding relationship between the engine speed, the cyclic injection amount and the opening of the supercharger bleed valve in the cold start stage. By querying the table, the corresponding first target opening can be found according to the current first speed and the first cyclic injection amount. Among them, the two-dimensional heating opening table is used to determine the optimal opening of the supercharger bleed valve under low exhaust temperature. The two-dimensional heating opening table can be created by measuring the influence of different engine speeds and cyclic injection amounts on the performance of the supercharger bleed valve, so that the opening of the supercharger bleed valve is adjusted to different target openings at different engine speeds and cyclic injection amounts. If the engine is in a low exhaust temperature state, the opening of the supercharger bleed valve will be greater than the second basic opening of the supercharger bleed valve under the same engine speed and cyclic injection amount, so as to effectively input the exhaust gas of the engine directly into the post-processing module, thereby increasing the temperature of the post-processing module, improving the efficiency of the post-processing module, and reducing the generation of NOx.

[0091] Finally, the opening of the turbocharger bleed valve is adjusted to the calculated first target opening, ensuring that the engine's combustion efficiency and emission control performance are improved by optimizing the intake air volume and exhaust temperature during the cold start phase.

[0092] In another optional manner, when the emission state of the engine is in a long reverse drag condition, the following steps are performed to determine and adjust the first target opening of the supercharger bleed valve:

[0093] Under the long reverse towing condition, the first target opening of the supercharger bleed valve is directly determined to be fully open. Because under the long reverse towing condition, the engine does not spray oil for a long time and the temperature drops quickly. At this time, the supercharger bleed valve needs to be fully opened to minimize the energy input of the turbine, reduce the intake volume, and thus slow down the temperature drop of the engine.

[0094] Adjust the opening of the supercharger bleed valve to the fully open state. Ensure that the engine's thermal management is optimized under long reverse towing conditions, and ensure that the engine can quickly return to normal operating temperature when accelerating again, reducing emission problems caused by excessive temperature drop.

[0095] In this embodiment, the opening of the supercharger bleed valve is adjusted by the above two optional methods, which can effectively cope with the heat management and emission control requirements of the engine under different working conditions. In the cold start stage, by obtaining the current speed and cyclic injection amount of the engine, and combining the two-dimensional heating opening table to determine the first target opening of the supercharger bleed valve, the intake volume and exhaust temperature are optimized, thereby improving the combustion efficiency of the engine, reducing the emission of pollutants such as nitrogen oxides (NOx), and accelerating the engine temperature rise speed, so that it can enter the normal working state faster. Under the long reverse drag working condition, the supercharger bleed valve is directly adjusted to the full open state, which minimizes the energy input of the turbine, reduces the intake volume, effectively slows down the engine temperature drop rate, ensures that the engine can quickly return to the normal working temperature when accelerating again, avoids the emission problem caused by too fast temperature drop, and enhances the adaptability and stability of the engine under complex working conditions. This flexible control strategy significantly improves the emission control performance of the engine in different operating stages, and provides strong technical support for meeting more stringent emission requirements.

[0096] Further, the process of determining the second target opening of the temperature increasing valve based on the first target opening of the supercharger air release valve in step S130 in the aforementioned embodiment may be described in detail.

[0097] Optionally, after determining the first target opening of the supercharger bleed valve, a pre-configured one-dimensional opening table will be queried, which records the corresponding relationship between the opening of the supercharger bleed valve and the opening of the temperature-raising valve under low exhaust temperature conditions (including the cold start stage and long reverse towing conditions). By looking up the determined first target opening in the table, the corresponding second target opening of the temperature-raising valve is found. Among them, the one-dimensional opening table is used to determine the optimal opening of the temperature-raising valve under low exhaust temperature conditions. If the engine is in a low exhaust temperature state, the opening of the temperature-raising valve will be smaller than the opening of the temperature-raising valve under the same opening of the supercharger bleed valve. By reducing the opening of the temperature-raising valve under low exhaust temperature conditions, the pressure difference between the supercharger temperature-raising valve and the EGR air intake side is increased to increase the exhaust gas volume refluxed from the engine to the EGR valve and reduce the generation of NOx.

[0098] The adjustment method based on the one-dimensional opening table in this embodiment can ensure that under low exhaust temperature conditions, a reasonable coordination relationship is maintained between the openings of the supercharger air release valve and the temperature raising valve, thereby optimizing the engine's intake volume and providing support for subsequent emission control.

[0099] Furthermore, if the emission state of the engine is not in a low exhaust temperature state (i.e., the engine is in a normal operating temperature range), the following steps can be performed to adjust the opening of the supercharger purge valve, the EGR valve, and the temperature raising valve:

[0100] First, the current speed of the engine (recorded as the third speed) and the current cycle injection amount (recorded as the third cycle injection amount) are obtained.

[0101] Next, the second basic setting opening of the supercharger bleed valve corresponding to the third speed and the third cycle injection amount is determined according to the configured two-dimensional basic setting opening table. The two-dimensional basic setting opening table records the corresponding relationship between the engine speed, the cycle injection amount and the supercharger bleed valve opening under non-low exhaust temperature conditions. By querying the table, the opening of the supercharger bleed valve suitable for the current operating state is found.

[0102] Finally, the opening of the turbocharger bleed valve is adjusted to the second basic setting opening. At the same time, in order to maintain good performance and emission control of the engine at normal operating temperature, the opening of the EGR valve can be adjusted to a fully open state to maximize the exhaust gas recirculation volume and optimize the combustion process; and the opening of the temperature boost valve can also be adjusted to a fully open state to ensure sufficient intake volume and maintain efficient operation of the engine.

[0103] This embodiment can achieve effective optimization of engine performance and emissions when the engine is in the normal operating temperature range by adjusting the engine's supercharger bleed valve, EGR valve and temperature-raising valve, ensuring that the engine's intake volume and exhaust temperature can be maintained within the optimal operating range when the engine is not at a low exhaust temperature, thereby improving combustion efficiency and reducing fuel consumption. Secondly, adjusting the opening of the EGR valve and the temperature-raising valve to a fully open state not only maximizes the exhaust gas recirculation volume, optimizes the combustion process, and reduces the emission of pollutants such as nitrogen oxides (NOx), but also ensures sufficient intake volume and maintains efficient operation of the engine. It significantly improves the engine's performance and emission control level at normal operating temperatures, enhances overall performance and reliability, and provides a strong guarantee for the engine to operate stably under various operating conditions.

[0104] Next, see Figure 3 , Figure 3 A schematic diagram of a working process of an engine in a cold start phase is provided in an embodiment of the present application. Figure 3 The control logic of the supercharger bleed valve, the temperature raising valve and the EGR valve when the engine is in the cold start stage is introduced in detail with the above-mentioned embodiments.

[0105] Optionally, first, according to the engine speed and the cyclic injection amount, the basic setting opening of the supercharger bleed valve is determined by setting the MAP (two-dimensional basic setting opening table) of the normal mode supercharger bleed valve. If the engine is in the cold start stage, that is, the exhaust temperature is lower than the exhaust temperature limit, the target opening of the supercharger bleed valve will be determined by setting the MAP (two-dimensional heating opening table) of the heating mode supercharger bleed valve according to the engine speed and the cyclic injection amount, and the opening of the supercharger bleed valve is adjusted through switch 1 to adjust the opening of the supercharger bleed valve to the target opening.

[0106] Next, the target opening of the temperature-raising valve is determined based on the target opening of the turbocharger bleed valve and the temperature-raising valve target setting CUR (one-dimensional opening table). The target opening of the temperature-raising valve is adjusted by switch 2.

[0107] Finally, according to the engine speed and the cycle injection amount, the basic setting opening of the EGR valve is determined by the EGR valve basic opening setting MAP (two-dimensional EGR valve basic opening table). Then, combined with the opening of the turbocharger bleed valve and the temperature raising valve, the target opening of the EGR valve is corrected by the EGR valve opening correction MAP (two-dimensional opening correction table). The corrected EGR valve target opening will be adjusted through switch 3 to ensure that the combustion process is optimized and NOx emissions are reduced by increasing the exhaust gas recirculation amount under low exhaust temperature conditions.

[0108] This embodiment demonstrates the logic of coordinated control of the supercharger bleed valve, the temperature raising valve and the EGR valve by the non-cooled EGR system during the cold start phase, so as to achieve effective control of engine emissions.

[0109] Next, see Figure 4 , Figure 4 A schematic diagram of a working process of an engine in a long reverse towing condition is provided in an embodiment of the present application. Figure 4 The control logic of the supercharger bleed valve, the temperature raising valve and the EGR valve when the engine is in the long reverse towing condition is introduced in detail with the above-mentioned embodiment.

[0110] Optionally, first, starting from the comparison between the cycle injection quantity and the oil quantity limit, if the cycle injection quantity is lower than the oil quantity limit and this state lasts for a preset delay opening time (30 seconds), it will be recognized that the engine is in a long reverse drag condition.

[0111] Under long reverse towing conditions, the target opening of the turbocharger bleed valve is set to 100% (fully open) and is directly adjusted to the maximum opening through switch 1 to reduce the energy input of the turbine, reduce the intake volume, and slow down the rate of engine temperature drop. The target opening of the temperature-raising valve is determined based on the target opening of the turbocharger bleed valve and the target setting CUR (one-dimensional opening table) of the temperature-raising valve. The target opening of the temperature-raising valve is adjusted through switch 2.

[0112] Finally, according to the engine speed and the amount of fuel injected in the cycle, the basic setting opening of the EGR valve is determined by the EGR valve basic opening setting MAP (two-dimensional EGR valve basic opening table). Then, combined with the opening of the turbocharger bleed valve and the temperature raising valve, the target opening of the EGR valve is corrected by the EGR valve opening correction MAP (two-dimensional opening correction table). The corrected EGR valve target opening will be adjusted through switch 3. Ensure that the combustion process is optimized and NOx emissions are reduced by increasing the exhaust gas recirculation volume under long reverse towing conditions.

[0113] This embodiment demonstrates how to increase the engine aftertreatment temperature, reduce the original exhaust NOx level, improve the aftertreatment conversion efficiency, and meet more stringent emission requirements by coordinating the opening of the supercharger bleed valve, temperature raising valve, and EGR valve under long reverse towing conditions.

[0114] The control device of the non-cooled EGR system provided in an embodiment of the present application is described below. The control device of the non-cooled EGR system described below and the control method of the non-cooled EGR system described above can refer to each other.

[0115] See also Figure 5 , Figure 5 This is a schematic diagram of the structure of a control device for a non-cooled EGR system disclosed in an embodiment of the present application.

[0116] like Figure 5 As shown, the device may include:

[0117] A state monitoring unit 11, used for monitoring the emission state of the engine;

[0118] A state judgment unit 12 is used to judge whether the emission state of the engine is in a low exhaust temperature state;

[0119] a supercharger bleed valve opening determination unit 13, configured to determine a first target opening of the supercharger bleed valve when the exhaust state of the engine is in a low exhaust temperature state, and adjust the opening of the supercharger bleed valve to the first target opening, wherein the first target opening is greater than the opening of the supercharger bleed valve in a non-low exhaust temperature state;

[0120] a temperature-raising valve opening determination unit 14, configured to determine a second target opening of the temperature-raising valve based on the first target opening of the supercharger exhaust valve, and adjust the opening of the temperature-raising valve to the second target opening, wherein the second target opening is smaller than the opening of the temperature-raising valve in a non-low exhaust temperature state;

[0121] The EGR valve opening determination unit 15 is used to determine the third target opening of the EGR valve based on the first target opening and the second target opening, and adjust the opening of the EGR valve to the third target opening, and the third target opening is not less than the opening of the EGR valve in a non-low exhaust temperature state.

[0122] In a possible implementation, the low exhaust temperature state includes a cold start phase and a long reverse towing condition.

[0123] In a possible implementation, the process of the temperature-raising valve opening determination unit 14 determining the third target opening of the EGR valve based on the first target opening and the second target opening includes:

[0124] determining a correction opening of the EGR valve based on the first target opening and the second target opening;

[0125] A third target opening degree of the EGR valve is determined based on the correction opening degree.

[0126] In a possible implementation, the process of the state determination unit 12 determining whether the emission state of the engine is in a low exhaust temperature state includes:

[0127] It is determined whether the exhaust temperature of the engine at the current moment is lower than a preset exhaust temperature limit value. If so, the exhaust state of the engine is in the cold start stage.

[0128] In a possible implementation, the process of the state determination unit 12 determining whether the emission state of the engine is in a low exhaust temperature state includes:

[0129] It is determined whether the cyclic fuel injection amount of the engine is lower than a preset fuel amount limit, and whether the time lower than the preset fuel amount limit reaches a preset time length. If so, the emission state of the engine is in the long reverse drag condition.

[0130] In a possible implementation, when the emission state of the engine is in the cold start stage, on this basis, the process of the supercharger purge valve opening determination unit 13 determining the first target opening of the supercharger purge valve includes:

[0131] Obtaining a first speed and a first cycle fuel injection amount of the engine;

[0132] The first target opening corresponding to the first speed and the first cyclic injection amount is determined according to a configured two-dimensional heating opening table, wherein the two-dimensional heating opening table records the corresponding relationship between the speed, the cyclic injection amount and the opening of the supercharger bleed valve during the cold start phase.

[0133] In a possible implementation, when the emission state of the engine is in the long reverse towing condition, on this basis, the process of the supercharger purge valve opening determination unit 13 determining the first target opening of the supercharger purge valve includes:

[0134] The first target opening of the supercharger purge valve is determined to be fully open.

[0135] In a possible implementation, the process of the temperature increasing valve opening determination unit 14 determining the second target opening of the temperature increasing valve based on the first target opening of the supercharger bleed valve includes:

[0136] The second target opening of the temperature raising valve corresponding to the first target opening is determined according to the configured one-dimensional opening table, wherein the one-dimensional opening table records the corresponding relationship between the opening of the supercharger bleed valve and the opening of the temperature raising valve under the low exhaust temperature state.

[0137] In a possible implementation, the process of the EGR valve opening determination unit 15 determining the corrected opening of the EGR valve based on the first target opening and the second target opening includes:

[0138] Obtain the configured two-dimensional opening correction table, and determine the corrected opening of the EGR valve corresponding to the first target opening and the second target opening according to the two-dimensional opening correction table, wherein the two-dimensional opening correction table records the corresponding relationship between the opening of the supercharger bleed valve, the opening of the temperature raising valve and the corrected opening of the EGR valve under the low exhaust temperature state.

[0139] In a possible implementation, the EGR valve opening determination unit 15 determines a third target opening of the EGR valve based on the corrected opening, and a process of adjusting the opening of the EGR valve to the third target opening includes:

[0140] Acquire a second speed and a second cycle fuel injection amount of the engine;

[0141] Determining a first basic set opening of the EGR valve corresponding to the second speed and the second cycle injection amount according to a configured two-dimensional EGR valve basic opening table, wherein the two-dimensional EGR valve basic opening table records the corresponding relationship between the speed, the cycle injection amount and the opening of the EGR valve in the non-low exhaust temperature state;

[0142] The third target opening is determined according to the first basic setting opening and the corrected opening, and the opening of the EGR valve is adjusted from the first basic setting opening to the third target opening, wherein the third target opening is not less than the first basic setting opening.

[0143] In a possible implementation manner, a control device for a non-cooled EGR system in an embodiment of the present application further includes:

[0144] a parameter acquisition unit, configured to acquire a third speed and a third cycle fuel injection amount of the engine if the emission state of the engine is not in the low exhaust temperature state;

[0145] a basic opening determination unit, configured to determine a second basic setting opening of the supercharger purge valve corresponding to the third speed and the third cyclic injection amount according to a configured two-dimensional basic setting opening table, wherein the two-dimensional basic setting opening table records the corresponding relationship between the speed, the cyclic injection amount and the opening of the supercharger purge valve in a non-low exhaust temperature state;

[0146] The basic opening adjustment unit is used to adjust the opening of the supercharger exhaust valve to the second basic set opening, adjust the opening of the EGR valve to fully open, and adjust the opening of the temperature raising valve to fully open.

[0147] A vehicle is also provided in an embodiment of the present application. The vehicle includes a non-cooled EGR system and a controller. The controller is used to implement a control method of the non-cooled EGR system in the aforementioned embodiment of the present application.

[0148] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The various embodiments can be combined as needed, and the same or similar parts can refer to each other.

Claims

1. A control method for a non-cooled EGR system, characterized in that: The non-cooled EGR system includes a turbocharger bleed valve, an EGR valve and a temperature raising valve of a turbine, one end of the turbocharger bleed valve is located between the left exhaust side of the engine and the front end of the turbine, and the other end is located between the rear end of the turbine and the front end of a post-processing module, the turbocharger bleed valve is used to allow the exhaust gas of the engine to directly enter the post-processing module without passing through the turbine, and the post-processing module is used to process the exhaust gas of the engine, the temperature raising valve is located between the rear end of the EGR air intake side and the front end of the turbine, the EGR valve is located at the front end of the EGR air intake side, the temperature raising valve is located at the right exhaust side of the engine, the pipelines on the left exhaust side and the right exhaust side are connected to the turbine, and the turbine is connected to the post-processing module, the method includes: Monitor the emission status of the engine; determining whether the emission state of the engine is in a low exhaust temperature state; If yes, determining a first target opening of the supercharger bleed valve, and adjusting the opening of the supercharger bleed valve to the first target opening, wherein the first target opening is greater than the opening of the supercharger bleed valve in a non-low exhaust temperature state; Determining a second target opening of the temperature-raising valve based on a first target opening of the supercharger purge valve, and adjusting the opening of the temperature-raising valve to the second target opening, wherein the second target opening is smaller than the opening of the temperature-raising valve in a non-low exhaust temperature state; A third target opening of the EGR valve is determined based on the first target opening and the second target opening, and the opening of the EGR valve is adjusted to the third target opening, which is not less than the opening of the EGR valve in a non-low exhaust temperature state.

2. The method according to claim 1, characterized in that The low exhaust temperature state includes a cold start stage and a long reverse towing condition.

3. The method according to claim 1, characterized in that The process of determining a third target opening of the EGR valve based on the first target opening and the second target opening includes: determining a correction opening of the EGR valve based on the first target opening and the second target opening; A third target opening degree of the EGR valve is determined based on the correction opening degree.

4. The method according to claim 2, characterized in that: The process of determining whether the emission state of the engine is in a low exhaust temperature state includes: It is determined whether the exhaust temperature of the engine at the current moment is lower than a preset exhaust temperature limit value. If so, the exhaust state of the engine is in the cold start stage.

5. The method according to claim 2, characterized in that: The process of determining whether the emission state of the engine is in a low exhaust temperature state includes: It is determined whether the cyclic fuel injection amount of the engine is lower than a preset fuel amount limit, and whether the time lower than the preset fuel amount limit reaches a preset time length. If so, the emission state of the engine is in the long reverse drag condition.

6. The method according to claim 2, characterized in that When the emission state of the engine is in the cold start stage, the process of determining the first target opening of the supercharger purge valve includes: Obtaining a first speed and a first cycle fuel injection amount of the engine; The first target opening corresponding to the first speed and the first cyclic injection amount is determined according to a configured two-dimensional heating opening table, wherein the two-dimensional heating opening table records the corresponding relationship between the speed, the cyclic injection amount and the opening of the supercharger bleed valve during the cold start phase.

7. The method according to claim 2, characterized in that When the emission state of the engine is in the long reverse drag condition, the process of determining the first target opening of the supercharger purge valve includes: The first target opening of the supercharger purge valve is determined to be fully open.

8. The method according to claim 1, characterized in that The process of determining the second target opening of the temperature raising valve based on the first target opening of the supercharger air release valve includes: The second target opening of the temperature raising valve corresponding to the first target opening is determined according to the configured one-dimensional opening table, wherein the one-dimensional opening table records the corresponding relationship between the opening of the supercharger bleed valve and the opening of the temperature raising valve under the low exhaust temperature state.

9. The method according to claim 3, characterized in that: The process of determining the corrected opening of the EGR valve based on the first target opening and the second target opening includes: Obtain the configured two-dimensional opening correction table, and determine the corrected opening of the EGR valve corresponding to the first target opening and the second target opening according to the two-dimensional opening correction table, wherein the two-dimensional opening correction table records the corresponding relationship between the opening of the supercharger bleed valve, the opening of the temperature raising valve and the corrected opening of the EGR valve under the low exhaust temperature state.

10. The method according to claim 3, characterized in that: The process of determining a third target opening of the EGR valve based on the corrected opening and adjusting the opening of the EGR valve to the third target opening includes: Acquire a second speed and a second cycle fuel injection amount of the engine; Determining a first basic set opening of the EGR valve corresponding to the second speed and the second cycle injection amount according to a configured two-dimensional EGR valve basic opening table, wherein the two-dimensional EGR valve basic opening table records the corresponding relationship between the speed, the cycle injection amount and the opening of the EGR valve in the non-low exhaust temperature state; The third target opening is determined according to the first basic setting opening and the corrected opening, and the opening of the EGR valve is adjusted from the first basic setting opening to the third target opening, wherein the third target opening is not less than the first basic setting opening.

11. The method according to claim 1, characterized in that: Also includes: If the emission state of the engine is not in the low exhaust temperature state, obtaining a third speed and a third cycle fuel injection amount of the engine; Determining a second basic setting opening of the supercharger bleed valve corresponding to the third speed and the third cyclic injection amount according to a configured two-dimensional basic setting opening table, wherein the two-dimensional basic setting opening table records the corresponding relationship between the speed, the cyclic injection amount and the opening of the supercharger bleed valve in a non-low exhaust temperature state; The opening of the supercharger purge valve is adjusted to the second basic set opening, the opening of the EGR valve is adjusted to be fully opened, and the opening of the temperature raising valve is adjusted to be fully opened.

12. A control device for a non-cooled EGR system, characterized in that: The non-cooled EGR system includes a turbocharger bleed valve, an EGR valve and a temperature raising valve of a turbine, one end of the turbocharger bleed valve is located between the left exhaust side of the engine and the front end of the turbine, and the other end is located between the rear end of the turbine and the front end of a post-processing module, the turbocharger bleed valve is used to allow the exhaust gas of the engine to directly enter the post-processing module without passing through the turbine, and the post-processing module is used to process the exhaust gas of the engine, the temperature raising valve is located between the rear end of the EGR air intake side and the front end of the turbine, the EGR valve is located at the front end of the EGR air intake side, the temperature raising valve is located at the right exhaust side of the engine, the pipelines on the left exhaust side and the right exhaust side are connected to the turbine, and the turbine is connected to the post-processing module, including: A condition monitoring unit, used to monitor the emission status of the engine; A state judgment unit, used to judge whether the emission state of the engine is in a low exhaust temperature state; a supercharger purge valve opening determination unit, configured to determine a first target opening of the supercharger purge valve when the exhaust state of the engine is in a low exhaust temperature state, and adjust the opening of the supercharger purge valve to the first target opening, wherein the first target opening is greater than the opening of the supercharger purge valve in a non-low exhaust temperature state; a temperature-raising valve opening determination unit, configured to determine a second target opening of the temperature-raising valve based on a first target opening of the supercharger exhaust valve, and adjust the opening of the temperature-raising valve to the second target opening, wherein the second target opening is smaller than the opening of the temperature-raising valve in a non-low exhaust temperature state; An EGR valve opening determination unit is used to determine a third target opening of the EGR valve based on the first target opening and the second target opening, and adjust the opening of the EGR valve to the third target opening, wherein the third target opening is not less than the opening of the EGR valve in a non-low exhaust temperature state.

13. A vehicle, characterized in that: include: A non-cooled EGR system and a controller, wherein the controller is used to implement each step in the control method of the non-cooled EGR system as described in any one of claims 1 to 11.

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