EGR system control method, vehicle, electronic equipment and storage medium
By obtaining the condensation temperature threshold and controlling the EGR system in stages, the problem of EGR exhaust condensate formation was solved, ensuring combustion stability and system reliability at high EGR rates, and avoiding condensate formation and corrosion.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-03-23
- Publication Date
- 2026-05-05
AI Technical Summary
Existing technologies cannot precisely prevent the formation of EGR exhaust condensate, which leads to unstable combustion, engine vibration, and system corrosion, affecting engine durability and reliability.
By obtaining the condensation temperature threshold of the temperature-controlled exhaust gas, the cooling degree and flow rate of the EGR exhaust gas are controlled in stages. The combination of EGR exhaust gas temperature control unit and EGR valve ensures that the exhaust gas temperature is always higher than the condensation temperature threshold, thus avoiding the generation of condensate.
It achieves precise prevention of condensation at high EGR rates, improves combustion stability, protects the engine system, avoids corrosion, and enhances system reliability and fuel efficiency.
Smart Images
Figure CN121976898A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of engine intake and exhaust system control, specifically to an EGR system control method, a vehicle, electronic equipment, and a storage medium. Background Technology
[0002] Exhaust Gas Recirculation (EGR) refers to the process of returning a portion of the exhaust gas from the engine to the intake manifold, where it is mixed with fresh air and re-enters the cylinders. A high EGR rate can improve emissions and fuel economy.
[0003] However, if the temperature of the EGR exhaust gas is lower than the dew point after cooling, condensate will be released. This condensate will enter the cylinder and affect combustion stability, and may even cause misfire and engine vibration. In addition, the condensate will also form an acidic corrosive solution with acidic gases (such as SOx and NOx) in the exhaust gas, which will cause corrosion of related components of the EGR system and seriously affect the durability and reliability of the engine.
[0004] Therefore, how to accurately prevent the generation of condensate and ensure a high EGR rate is an urgent problem to be solved. Summary of the Invention
[0005] In view of the above, embodiments of this application provide an EGR system control method, a vehicle, an electronic device, and a storage medium that can accurately prevent the generation of condensate and ensure a high EGR rate as much as possible.
[0006] In a first aspect, embodiments of this application provide an EGR system control method, the EGR system comprising: an EGR exhaust gas temperature control unit and an EGR valve, the EGR exhaust gas temperature control unit and the EGR valve being connected via pipelines; the EGR system control method comprising: Obtain the condensation temperature threshold of the temperature-controlled exhaust gas, wherein the temperature-controlled exhaust gas is the engine exhaust gas that has been temperature-controlled by the EGR exhaust gas temperature control unit; The degree of condensation risk of the temperature-controlled exhaust gas is determined based on the condensation temperature threshold and the temperature of the temperature-controlled exhaust gas. If the condensation risk level is the first condensation risk level, the cooling level of the engine exhaust gas is reduced by the EGR exhaust gas temperature control unit. If the condensation risk level is classified as the second condensation risk level, the opening degree of the EGR valve is reduced; wherein the second condensation risk level is higher than the first condensation risk level.
[0007] This technical solution obtains the condensation temperature threshold of the temperature-controlled exhaust gas and uses it to determine the degree of condensation risk. When the condensation risk level is at the relatively low first condensation risk level, the cooling degree of the engine exhaust gas is reduced by the EGR exhaust gas temperature control unit. Without reducing the EGR valve opening, the exhaust gas temperature can be increased while maintaining a high EGR rate, thus avoiding the conditions for condensate precipitation from a temperature perspective. When the condensation risk escalates to the higher second condensation risk level, the EGR valve opening is reduced to decrease the recirculated exhaust gas flow, thereby reducing the EGR rate. This can eliminate the condensation risk under high-risk operating conditions. Through the above-mentioned graded control method, different condensation risk scenarios can be accurately addressed, and a high EGR rate can be maintained as much as possible while accurately preventing condensate formation.
[0008] In some embodiments, the EGR exhaust gas temperature control unit includes an EGR cooler bypass valve and an EGR cooler; The inlet of the EGR cooler bypass valve is connected to the engine exhaust passage. The outlet of the EGR cooler bypass valve is provided with a cooling branch and a bypass branch. The EGR cooler is installed on the cooling branch. The bypass branch and the cooling branch merge downstream of the outlet of the EGR cooler and are connected to the inlet of the EGR valve. The step of reducing the cooling level of the engine exhaust gas through the EGR exhaust gas temperature control unit includes: Reduce the flow rate of coolant in the EGR cooler, and / or increase the proportion of exhaust gas flowing to the bypass branch via the EGR cooler bypass valve.
[0009] This technical solution offers two control methods: reducing coolant flow and increasing the proportion of bypass exhaust gas. Reducing coolant flow is more energy-efficient, while increasing bypass exhaust gas has higher adjustment efficiency. This makes the intervention strategy for the first level of condensation risk more flexible and efficient, and can deal with different levels of condensation risk in the most appropriate way.
[0010] In some embodiments, the first condensation risk level includes a first condensation risk sub-level and a second condensation risk sub-level, wherein the first condensation risk sub-level is lower than the second condensation risk level; The reduction of the coolant flow rate in the EGR cooler, and / or the increase of the proportion of exhaust gas flowing to the bypass branch via the EGR cooler bypass valve, includes: If the condensation risk level belongs to the first condensation risk sub-level, then the step of reducing the flow rate of coolant in the EGR cooler is performed; If the condensation risk level belongs to the second condensation risk sub-level, then the step of increasing the proportion of exhaust gas flowing to the bypass branch through the EGR cooler bypass valve is performed.
[0011] When adopting this technical solution, for the first condensation risk sub-level, the method of reducing the coolant flow rate with less disturbance and energy saving is preferred because this operation only affects the heat exchange efficiency without changing the path and flow rate of the exhaust gas itself. It can increase the exhaust gas temperature, has low energy consumption, and has little impact on EGR rate and emissions, which can reflect the principle of energy saving priority.
[0012] When the risk level is at the second condensation level, it indicates that simply reducing the cooling capacity is insufficient to prevent condensation. In this case, increasing the bypass ratio, such as introducing an uncooled hot exhaust gas to mix with the cooled exhaust gas, can quickly and efficiently raise the temperature of the mixed gas. This operation has a fast response speed and significant effect. While effectively preventing condensation, it can maintain the cooling function of the main EGR circuit, and the impact on emission targets is controllable.
[0013] In some embodiments, obtaining the condensation temperature threshold of the temperature-controlled exhaust gas includes: The dew point temperature of the temperature-controlled exhaust gas is predicted to obtain the predicted dew point temperature. The condensation temperature threshold of the temperature-controlled exhaust gas is obtained based on the preset safety margin temperature and the predicted dew point temperature, and the condensation temperature threshold is greater than the predicted dew point temperature.
[0014] By adopting this technical solution and introducing a safety margin temperature when determining the condensation temperature threshold, a buffer can be provided for sensor errors, model deviations and system response delays, which can significantly improve the robustness and reliability of the control. Moreover, the preventive measures have sufficient lead time, which can avoid the risk of condensation caused by control lag.
[0015] In some embodiments, predicting the dew point temperature of the temperature-regulating exhaust gas to obtain the predicted dew point temperature includes: Determine the humidity and pressure of the temperature-controlled exhaust gas; The temperature, humidity, and pressure of the temperature-controlled exhaust gas are input into a preset dynamic dew point prediction model to obtain the predicted dew point temperature of the temperature-controlled exhaust gas.
[0016] This technical solution dynamically predicts the dew point temperature, enabling the predicted dew point temperature to change in real time with the humidity and pressure of the exhaust gas.
[0017] In some embodiments, determining the condensation risk level of the temperature-controlled exhaust gas based on the condensation temperature threshold and the temperature of the temperature-controlled exhaust gas includes: Calculate the difference between the condensation temperature threshold and the temperature of the temperature-controlled exhaust gas; The degree of condensation risk is determined based on the difference.
[0018] This technical solution calculates the difference between the condensation temperature threshold and the actual exhaust gas temperature to reflect the temperature rise required for condensation to occur in the current state, which can provide an accurate basis for subsequent condensation risk level assessment.
[0019] In some embodiments, the EGR system control method further includes: Monitor the operating status of each device in the EGR system; If there is a device malfunctioning in the EGR system, then determine the fault tolerance mode that matches the malfunctioning device. Fault tolerance control is performed based on the matched fault tolerance mode.
[0020] By adopting this technical solution and adding fault diagnosis and fault-tolerant control functions, the robustness and safety of the entire control system can be improved.
[0021] Secondly, embodiments of this application also provide a vehicle, the vehicle including an EGR system control device and an EGR system, the EGR system including: an EGR exhaust gas temperature control unit and an EGR valve, the EGR exhaust gas temperature control unit and the EGR valve being connected via pipelines; the EGR system control device includes; The threshold acquisition module is used to acquire the condensation temperature threshold of the temperature-controlled exhaust gas, which is the exhaust gas discharged from the engine that has been temperature-controlled by the EGR exhaust gas temperature control unit. The risk determination module is used to determine the degree of condensation risk of the temperature-controlled exhaust gas based on the condensation temperature threshold and the temperature of the temperature-controlled exhaust gas. An exhaust gas temperature control module is used to reduce the cooling level of the exhaust gas discharged from the engine by means of the EGR exhaust gas temperature control unit if the condensation risk level is the first condensation risk level. The valve regulating module is used to control the opening degree of the EGR valve to decrease if the condensation risk level is at the second condensation risk level; wherein the second condensation risk level is higher than the first condensation risk level.
[0022] Thirdly, embodiments of this application also provide an electronic device, the electronic device including a processor and a memory, the memory being used to store instructions, and the processor being used to call the instructions in the memory, causing the electronic device to execute the EGR system control method as described in the first aspect.
[0023] Fourthly, embodiments of this application also provide a computer-readable storage medium that stores computer instructions that, when executed on an electronic device, cause the electronic device to perform the EGR system control method as described in the first aspect.
[0024] Understandably, the vehicle, electronic equipment, and storage medium provided above correspond to the EGR system control method of the first aspect above. Therefore, the beneficial effects that can be achieved can be referred to the beneficial effects in the corresponding EGR system control method provided above, and will not be repeated here. Attached Figure Description
[0025] Figure 1 This is a schematic diagram of the gas path structure of an EGR system according to an embodiment of this application.
[0026] Figure 2 This is a schematic diagram of the water circuit structure of an engine cooling system according to an embodiment of this application.
[0027] Figure 3 This is a schematic diagram of the system architecture of an EGR system control method provided according to an embodiment of this application.
[0028] Figure 4 This is a flowchart of the steps of an EGR system control method according to an embodiment of this application.
[0029] Figure 5 This is a schematic diagram of the structure of an EGR system control device according to an embodiment of this application.
[0030] Figure 6 This is a schematic diagram of the structure of an electronic device provided according to an embodiment of this application.
[0031] Explanation of key component symbols: 101. Catalytic converter; 102. EGR intake pipe; 103. EGR exhaust gas temperature control unit; 1031. EGR cooler; 1032. EGR cooler bypass valve; 1033. Cooling branch; 1034. Bypass branch; 104. EGR valve; 105. Sensor; 106. EGR hose; 107. Turbocharger; 108. Intercooler; 109. Throttle body; 110. Air filter; 111. Pressure regulating valve; 201. Electric water pump; 202. Cylinder block; 203. Cylinder head; 204. Heat exchanger; 205. Thermostat; 206. Vehicle cooler; 207. Vehicle fan; 208. Expansion tank. Detailed Implementation
[0032] To better understand the above-mentioned objectives, features, and advantages of this application, the application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.
[0033] The following description sets forth many specific details to provide a full understanding of this application. The described embodiments are only some, not all, of the embodiments of this application.
[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application.
[0035] It should be further noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.
[0036] In this application, "at least one" means one or more, and "more than one" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and drawings of this application are used to distinguish similar objects, not to describe a specific order or sequence.
[0037] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.
[0038] Exhaust gas recirculation (EGR) technology is a key technology for reducing nitrogen oxide emissions in modern internal combustion engines. To maximize the emission reduction and fuel-saving benefits of EGR technology, a high EGR rate and deep cooling of the exhaust gas are usually required. However, during the cooling process, exhaust gas is highly susceptible to condensation below its dew point. This condensate entering the cylinder with the exhaust gas can lead to combustion instability, engine vibration, and, combined with acidic gases such as SOx and NOx in the exhaust gas, form a corrosive solution, severely damaging the durability and reliability of the EGR system and the engine.
[0039] In some embodiments, the electronic device can rapidly reduce the EGR rate or shut off the EGR valve 104 upon detecting a misfire caused by condensation. However, while this embodiment can mitigate serious consequences, it is an after-the-fact remedy and suffers from problems such as delayed response, decreased driving experience, instantaneous increase in emissions, and being forced to limit the EGR rate for an extended period to avoid risks. It cannot prevent the formation of condensate at its source.
[0040] Therefore, how to accurately prevent the generation of condensate and ensure a high EGR rate is a technical problem that urgently needs to be solved in this field.
[0041] In view of the above, embodiments of this application provide an EGR system control method, a vehicle, an electronic device, and a computer-readable storage medium.
[0042] This EGR system control method can be used in an EGR system control device, which can be integrated into an electronic device that can be configured in a vehicle. For example, the electronic device can be an Electronic Control Unit (ECU) or a Microcontroller Unit (MCU) in the vehicle, but is not limited to these. The electronic device can communicate with the various sensors 105 and actuators in the vehicle.
[0043] In the EGR system, electronic devices can communicate with the sensors 105 and actuators in the EGR system air passage structure and the engine cooling water passage structure to execute the EGR system control method in the embodiments of this application.
[0044] refer to Figure 1 As shown, Figure 1 This is a schematic diagram of the gas path structure of an EGR system provided in an embodiment of this application.
[0045] exist Figure 1 In the process, the high-temperature exhaust gas after combustion of the vehicle engine flows out through the exhaust manifold. After being initially purified by the catalytic converter 101 (CAT), a portion of the exhaust gas is diverted through the EGR intake pipe 102 and used as exhaust gas to be recirculated by the engine (referred to as recirculated exhaust gas).
[0046] The recirculated exhaust gas can reach the EGR exhaust gas temperature control unit 103, which can be connected to the EGR valve 104 through a pipeline.
[0047] The EGR exhaust gas temperature control unit 103 is used to regulate the temperature of the recirculated exhaust gas to output temperature-controlled exhaust gas, which can be delivered to the inlet of the EGR valve 104 through a pipeline.
[0048] In some embodiments, the EGR exhaust gas temperature control unit 103 may include an EGR cooler 1031 to cool the recirculated exhaust gas to obtain temperature-controlled exhaust gas.
[0049] In other embodiments, the EGR exhaust gas temperature control unit 103 may include an EGR cooler 1031 and an EGR cooler bypass valve 1032.
[0050] The inlet of the EGR cooler bypass valve 1032 is connected to the engine exhaust passage, and the outlet of the EGR cooler bypass valve 1032 is provided with a cooling branch 1033 and a bypass branch 1034.
[0051] An EGR cooler 1031 is installed on the cooling branch 1033. A bypass branch 1034 merges with the cooling branch 1033 downstream of the outlet of the EGR cooler 1031 and is connected to the inlet of the EGR valve 104.
[0052] The recirculated exhaust gas can reach the EGR cooler bypass valve 1032. The EGR cooler bypass valve 1032 can determine the direction of the recirculated exhaust gas flow and the flow rate of each direction.
[0053] Furthermore, the opening degree of the EGR cooler bypass valve 1032 can control the flow rate of recirculated exhaust gas to the bypass branch 1034.
[0054] For example, when the EGR cooler bypass valve 1032 is open, the recirculated exhaust gas can flow to the bypass branch 1034. The larger the opening degree of the EGR cooler bypass valve 1032, the greater the flow rate of the recirculated exhaust gas to the bypass branch 1034.
[0055] When the EGR cooler bypass valve 1032 is fully closed, the recirculated exhaust gas can flow into the EGR cooler 1031 through the cooling branch 1033 without passing through the bypass branch 1034.
[0056] The EGR cooler 1031 exchanges heat with the engine coolant, significantly reducing the exhaust gas temperature.
[0057] When the bypass valve is opened, a portion of the exhaust gas passes directly through the bypass branch 1034, bypassing the EGR cooler 1031 and maintaining its high temperature.
[0058] The cooled low-temperature exhaust gas and the bypassed high-temperature exhaust gas converge downstream of the EGR cooler 1031 to form temperature-controlled exhaust gas with precise temperature regulation.
[0059] For example, bypass branch 1034 and cooling branch 1033 merge downstream of the outlet of the EGR cooler 1031 and enter a merge pipe, the other end of which is connected to the inlet of the EGR valve 104. Multiple sensors 105 can be configured on this merge pipe so that the temperature-regulating exhaust gas, before flowing from the merge pipe to the inlet of the EGR valve 104, has its status collected by the multiple sensors 105.
[0060] The plurality of sensors 105 may include: an EGR temperature sensor, an EGR humidity sensor, and an EGR pressure sensor.
[0061] Among them, the EGR temperature sensor is used to measure the actual temperature (T_egr) of the temperature-controlled exhaust gas.
[0062] The EGR humidity sensor is used to measure the humidity (Humidity_egr) of the temperature-controlled exhaust gas.
[0063] EGR pressure sensors are used to measure pipeline pressure (P_egr).
[0064] After the temperature-controlled exhaust gas reaches the inlet of EGR valve 104, it can pass through EGR valve 104. The electronic control unit can adjust the mass flow rate (i.e., EGR rate) of the recirculated exhaust gas by adjusting the opening degree of EGR valve 104.
[0065] Next, the temperature-controlled exhaust gas can be transported through EGR hose 106 to the intake manifold after turbocharger 107 and intercooler 108 and before engine throttle valve 109.
[0066] Here, the exhaust gas is thoroughly mixed with the fresh air that passes through the air filter 110, the pressure regulating valve 111 and the boost valve in sequence, and finally drawn into the engine cylinder to participate in combustion.
[0067] The above schematic diagram of the EGR system gas path structure is only an example. In actual application, it can be set according to the requirements. This application embodiment does not limit it.
[0068] refer to Figure 2 As shown, Figure 2 This application provides an embodiment of an engine cooling system water circuit structure, which provides a controllable cooling medium for the EGR cooler 1031. The following is in conjunction with... Figure 2 Explain the coolant path.
[0069] The electric water pump 201 can drive the coolant to flow through the engine block 202 and cylinder head 203 to absorb the waste heat of the engine body.
[0070] The gas then flows through the EGR cooler 1031, where it exchanges heat with the exhaust gas that is being cooled, thus achieving the cooling of the exhaust gas.
[0071] Next, the coolant can flow through the heater heat exchanger 204 to provide warm air to the cockpit, and then through the thermostat 205.
[0072] The thermostat 205 can control whether the coolant flows into the vehicle radiator 206 (cooler) for large-circulation heat dissipation according to the water temperature; the vehicle fan 207 provides forced cooling airflow to the radiator; the expansion tank 208 is used to compensate for changes in coolant volume.
[0073] The rotational speed of the electronic water pump 201 can be precisely controlled by electronic equipment, thereby adjusting the flow rate of the coolant flowing through the EGR cooler 1031 and achieving fine and dynamic control of the heat exchange capacity of the EGR cooler 1031.
[0074] Electronic devices can be connected via wire harnesses Figure 1 and Figure 2 The sensors 105 and actuators shown include, for example, the bypass valve and EGR valve 104 in the air circuit, the electronic water pump 201 in the water circuit, as well as the thermostat 205, fan, etc.
[0075] It is understandable that the above Figure 2 The provided engine cooling system water circuit structure is only an example. In actual applications, the engine cooling system water circuit structure can be configured accordingly. This application embodiment does not limit this.
[0076] Based on the above Figure 1 The provided EGR system gas path structure and Figure 2 In addition to the provided engine cooling system water circuit structure, this application embodiment also provides a system architecture for an EGR system control method.
[0077] refer to Figure 3 As shown, the architecture adopts a layered design, presenting a closed-loop control process of perception-prediction-decision-execution-feedback. It can calculate the dew point temperature in real time according to the preset dynamic dew point prediction model, and coordinate the three actuators by a multi-mode intelligent decision algorithm to actively maintain the EGR exhaust gas temperature above the condensation temperature threshold (such as dew point temperature + safety margin temperature), thereby avoiding the generation of condensate.
[0078] exist Figure 3 The system architecture includes a perception layer, an intelligent control core layer, and an execution output layer. Each layer will be described below: 1. Sensing Layer: The sensing layer serves as the data input for this system, enabling real-time acquisition of physical parameters from the engine and EGR system. The sensing layer may include: The EGR temperature sensor is used to measure the actual temperature (T_egr) of the temperature-controlled exhaust gas.
[0079] The EGR humidity sensor is used to measure the humidity (Humidity_egr) of the temperature-controlled exhaust gas.
[0080] EGR pressure sensors are used to measure pipeline pressure (P_egr).
[0081] Engine load and speed sensors are used to provide real-time operating information of the engine.
[0082] The data collected by each sensor 105 in the aforementioned perception layer can be uniformly transmitted to the intelligent control core layer to provide data support for subsequent prediction and decision-making.
[0083] 2. The intelligent control core layer may be configured with an electronic device according to the embodiments of this application, which can be used to execute the EGR system control method provided in the embodiments of this application.
[0084] The EGR system control method may include: acquiring a condensation temperature threshold for the temperature-controlled exhaust gas, wherein the temperature-controlled exhaust gas is engine exhaust gas that has been temperature-controlled by the EGR exhaust gas temperature control unit; determining the condensation risk level of the temperature-controlled exhaust gas based on the condensation temperature threshold and the temperature of the temperature-controlled exhaust gas; if the condensation risk level is a first condensation risk level, then reducing the cooling degree of the engine exhaust gas through the EGR exhaust gas temperature control unit 103; if the condensation risk level is a second condensation risk level, then controlling the opening degree of the EGR valve 104 to decrease; wherein the second condensation risk level is higher than the first condensation risk level.
[0085] This application embodiment obtains the condensation temperature threshold of the temperature-controlled exhaust gas and uses it to determine the degree of condensation risk. When the condensation risk is at a relatively low first condensation risk level, the cooling degree of the exhaust gas discharged from the engine is reduced by the EGR exhaust gas temperature-controlled unit 103. Without reducing the opening of the EGR valve 104, the exhaust gas temperature can be increased while maintaining a high EGR rate, thus avoiding the conditions for condensate precipitation from the temperature level.
[0086] When the condensation risk escalates to a higher second condensation risk level, the EGR rate is directly reduced by controlling the opening of EGR valve 104 to decrease the recirculated exhaust gas flow, thereby eliminating the condensation hazard under high-risk conditions from the root. Through the above-mentioned graded control method, different condensation risk scenarios can be accurately addressed, and a high EGR rate can be maintained as much as possible while accurately preventing the generation of condensate.
[0087] Based on the above EGR system control method, the intelligent control core layer can be divided into a dynamic dew point prediction module, a multi-mode intelligent decision-making algorithm, and a fault diagnosis and fault-tolerant control module.
[0088] The dynamic dew point prediction module receives data from all relevant sensors 105 in the sensing layer (especially humidity, pressure, and operating condition data), calculates the dew point temperature (T_dp) under the current exhaust gas condition using the built-in dynamic dew point prediction model, and outputs the accurate dew point temperature in real time.
[0089] The inputs to the multi-mode intelligent decision-making algorithm include T_dp output by the dynamic dew point prediction module, T_egr directly collected by the perception layer, and engine operating condition data. Based on these input data, it outputs coordinated control commands for different actuators.
[0090] The fault diagnosis and fault-tolerant control module is used to monitor the status of the entire system in real time, including the rationality of sensor signals and actuator feedback. Once an anomaly is detected, the fault diagnosis and fault-tolerant control module will intervene and adjust or override the instructions generated by the multi-mode intelligent decision-making algorithm, and activate the preset backup fault-tolerant strategy to ensure system safety.
[0091] The intelligent control core layer can control each actuator in the execution output layer.
[0092] 3. The execution output layer (actuator) can receive and execute instructions from the control core layer, and is the action output end of the system.
[0093] The output layer may include, but is not limited to, EGR cooler bypass valve 1032, EGR valve 104 and electric water pump 201.
[0094] Among them, the electronic water pump 201 can be used to control the flow rate of coolant flowing through the EGR cooler 1031, so as to achieve fine and gentle adjustment of cooling intensity.
[0095] The EGR cooler bypass valve 1032 can be used to control whether exhaust gas flows through the cooler and its flow rate, thereby achieving rapid adjustment of exhaust gas temperature.
[0096] EGR valve 104 can be used to control the flow rate of exhaust gas recirculation (EGR rate), achieving fundamental regulation of emissions and risks.
[0097] The aforementioned actuators can act on the EGR cooler 1031 and the EGR system piping to change the exhaust gas temperature (T_egr) in the EGR system piping. The adjusted exhaust gas temperature (T_egr) is collected in real time by the EGR temperature sensor in the sensing layer and fed back to the control core layer, thus forming a continuously operating closed-loop control loop of perception → decision → execution → re-perception.
[0098] Through the coordinated work of the above layers, it can be ensured that the temperature of T_egr≥T_dp+safety margin can be actively maintained regardless of changes in engine operating conditions, thereby eliminating the generation of condensate at the source.
[0099] Understandable Figure 3 The system architecture of the EGR system control method shown is only an example. In actual applications, it can be set according to requirements, for example, setting more or fewer sensors. This application embodiment does not limit this.
[0100] The above combination Figure 3 The system architecture of the EGR system control method is introduced below. Figure 4 This paper introduces an EGR system control method that can be applied to electronic devices in the core layer of intelligent control, such as ECUs or MCUs.
[0101] refer to Figure 4 As shown, the EGR system control method may include: Step 401: Obtain the condensation temperature threshold of the temperature-controlled exhaust gas.
[0102] The temperature-controlled exhaust gas is the exhaust gas discharged from the engine that has been conditioned by the EGR exhaust gas temperature-controlled unit 103. For example, a portion of the exhaust gas discharged from the engine will reach the EGR exhaust gas temperature-controlled unit 103 through the exhaust manifold and EGR intake pipe 102. The EGR exhaust gas temperature-controlled unit 103 will cool and conditioned the exhaust gas discharged from the engine to obtain temperature-controlled exhaust gas.
[0103] When the EGR exhaust gas temperature control unit 103 includes an EGR cooler 1031 but does not include an EGR cooler bypass valve 1032, the temperature-controlled exhaust gas is the engine exhaust gas that has been cooled and regulated by the EGR cooler 1031.
[0104] When the EGR exhaust gas temperature control unit 103 includes an EGR cooler bypass valve 1032 and an EGR cooler 1031, the temperature control exhaust gas is the mixed exhaust gas in the confluence pipeline after the bypass branch 1034 and the cooling branch 1033 merge downstream of the outlet of the EGR cooler 1031.
[0105] The condensation temperature threshold is a critical safe temperature reference line for determining whether exhaust gas will condense into water.
[0106] For example, step 401 can be achieved through the following steps a1 and a2: Step a1: Predict the dew point temperature of the temperature-controlled exhaust gas to obtain the predicted dew point temperature.
[0107] In some embodiments, step 4011 may include: the electronic device can collect the temperature, humidity, and pressure of the temperature-controlled exhaust gas. For example, the electronic device determines the real-time humidity, pressure, and temperature of the temperature-controlled exhaust gas through a humidity sensor, a pressure sensor, and a temperature sensor installed in the upstream pipeline of the EGR valve 104.
[0108] Then, the temperature, humidity, and pressure of the temperature-controlled exhaust gas are input into a preset dynamic dew point prediction model to obtain the predicted dew point temperature.
[0109] The dynamic dew point prediction model can be a pre-calibrated multidimensional pulse spectrum (i.e., a dew point temperature MAP), which can take the temperature, humidity and pressure of the temperature-controlled exhaust gas as input and output the predicted dew point temperature.
[0110] Condensation occurs depending on parameters such as temperature, pressure, and humidity. In this application, a humidity sensor, a pressure sensor, and a temperature sensor are introduced to measure the humidity, pressure, and temperature of the exhaust gas, so that the electronic equipment can accurately calculate the dew point temperature (T_dp) of the current exhaust gas composition in real time.
[0111] In some embodiments, the electronic device may use the predicted dew point temperature as a condensation temperature threshold; in other embodiments, the electronic device may perform step a2.
[0112] Step a2: Obtain the condensation temperature threshold based on the preset safety margin temperature and the predicted dew point temperature.
[0113] For example, an electronic device can add the safety margin temperature and the predicted dew point temperature to obtain the condensation temperature threshold.
[0114] That is, the condensation temperature threshold = predicted dew point temperature T_dp + safety margin temperature ΔT. The safety margin temperature is a positive value (e.g., 2-5°C) set according to the sensor 105 accuracy, model error, and system response delay to provide a buffer and ensure the forward-looking nature of the control.
[0115] For example, the safety margin temperature can be a coefficient greater than 0. Electronic devices can obtain the condensation temperature threshold using the following formula: Condensation temperature threshold = (Safety margin temperature + 1) Predict the dew point temperature.
[0116] The condensation temperature threshold of this embodiment dynamically changes with engine operating conditions (such as changes in exhaust gas composition due to load changes), thus achieving refined control.
[0117] That is, in this embodiment of the application, the EGR system gas path structure can integrate an EGR temperature sensor (T_egr), an EGR humidity sensor (Humidity_egr), and an EGR pressure sensor (P_egr) to acquire the status parameters of the merged exhaust gas (i.e., temperature-controlled exhaust gas) in real time. Based on this high-precision data and a preset dew point temperature MAP, the electronic equipment can dynamically and accurately calculate the actual dew point temperature (T_dp) of the current exhaust gas, and introduce an adjustable safety margin temperature (ΔT) to set the anti-condensation condensation temperature threshold (T_dp + ΔT).
[0118] Then, after obtaining the condensation temperature threshold, the electronic device can perform the following step 402.
[0119] Step 402: Determine the degree of condensation risk of the temperature-controlled exhaust gas based on the condensation temperature threshold and the temperature of the temperature-controlled exhaust gas.
[0120] In some embodiments, the electronic device may calculate the difference (ΔT_need) between the condensation temperature threshold and the real-time temperature of the temperature-controlled exhaust gas.
[0121] This difference reflects the minimum temperature rise required to remove the risk of condensation from the temperature-controlled exhaust gas, and can be used as a quantitative indicator of the degree of condensation risk. The smaller the difference (or a negative value), the lower the minimum temperature rise required to remove the risk of condensation from the temperature-controlled exhaust gas, indicating a lower condensation risk; the larger the difference, the higher the minimum temperature rise required to remove the risk of condensation from the temperature-controlled exhaust gas, indicating a higher condensation risk.
[0122] Step 403: Determine the condensation risk level to which the condensation risk degree belongs.
[0123] Each condensation risk level can correspond to a ΔT_need range, and the condensation risk level to which the condensation risk level belongs can be determined based on the ΔT_need range in which the condensation risk level falls.
[0124] For example, when the condensation risk level is less than or equal to 0, that is, when the real-time temperature of the temperature-controlled exhaust gas is greater than or equal to the condensation temperature threshold, it means that there is no condensation risk at present. The electronic equipment can control the EGR system to execute the normal cooling mode. For example, the coolant valve opening is normal, the EGR cooler bypass valve 1032 is closed, the EGR valve 104 is controlled according to the target EGR rate, and the electronic equipment continues to monitor the data of various sensors 105 in real time.
[0125] If the degree of condensation risk is at the first condensation risk level, for example, ΔT_need is less than or equal to 15, indicating a mild condensation risk, the electronic device can proceed to step 404.
[0126] If the degree of condensation risk is classified as the second condensation risk level, for example, ΔT_need is greater than 15, it indicates that there is a severe condensation risk. The aforementioned measures to adjust the cooling level are insufficient to ensure safety. In this case, the electronic device can execute step 405.
[0127] Step 404: Reduce the cooling level of the exhaust gas from the engine by using the EGR exhaust gas temperature control unit.
[0128] In some embodiments, a specific structure of the EGR exhaust gas temperature control unit 103 is as follows: Figure 2 As shown, the EGR exhaust gas temperature control unit 103 includes an EGR cooler bypass valve 1032 and an EGR cooler 1031. The inlet of the EGR cooler bypass valve 1032 is connected to the engine exhaust passage, and its outlet is provided with a first branch and a second branch.
[0129] The first branch line is equipped with the EGR cooler 1031. The second branch line (bypass branch 1034) merges with the first branch line downstream of the outlet of the EGR cooler 1031. The merged pipeline is connected to the inlet of the EGR valve 104.
[0130] Step 404 may include: if the condensation risk level is the first condensation risk level, reducing the flow rate of coolant in the EGR cooler 1031, and / or increasing the proportion of exhaust gas flowing to the bypass branch 1034 through the EGR cooler bypass valve 1032, for example, adjusting the EGR cooler bypass valve 1032 from the closed state to the open state, thereby achieving the purpose of reducing the cooling level of the exhaust gas discharged from the engine.
[0131] Furthermore, in some embodiments, step 4031 specifically includes two sub-modes, which correspond to two sub-levels under the first condensation risk level, namely, the first condensation risk sub-level and the second condensation risk sub-level, wherein the first condensation risk sub-level is lower than the second condensation risk sub-level.
[0132] If the condensation risk level is a relatively low first condensation risk sub-level (e.g., condensation risk level less than or equal to 5), then the "reduce the flow rate of coolant in the EGR cooler 1031" will be executed first.
[0133] This can be achieved by reducing the speed of the electric water pump 201 that supplies liquid to the EGR cooler 1031, or by using a thermostat 205, thereby gently increasing the exhaust gas temperature in the most energy-efficient way with minimal impact on the EGR rate and emissions.
[0134] If the condensation risk level is the higher second condensation risk sub-level, then "the proportion of exhaust gas leading to the second branch is increased by means of the EGR cooler bypass valve 1032".
[0135] That is, the electronic equipment can increase the opening of the EGR cooler bypass valve 1032, allowing some high-temperature exhaust gas to bypass the cooler and mix directly with the cooled exhaust gas, thereby rapidly and significantly increasing the temperature of the mixed gas, while basically maintaining the function of the main EGR circuit.
[0136] The above describes the control mode when the condensation risk level is at the first condensation risk level. If the condensation risk level is at the first condensation risk level, the electronic device can execute step 405.
[0137] Step 405: Control the EGR valve opening to decrease.
[0138] In this embodiment, the opening of the EGR valve 104 is reduced to decrease the EGR rate, such as by 5% to 10%. This control mode can directly reduce the amount of exhaust gas recirculation, reduce the total amount of water vapor entering the system from the source, and introduce more high-temperature fresh air, thereby forcibly increasing the exhaust gas temperature and ensuring that no condensation occurs.
[0139] While adjusting the EGR valve 104, the engine throttle valve 109 or the turbocharger 107 can be adjusted in conjunction to compensate for changes in intake air volume and maintain stable engine operation.
[0140] In some embodiments, if the degree of condensation risk is at the second condensation risk level, the electronic device can not only control the opening of the EGR valve 104 to decrease, but also open the EGR cooler bypass valve 1032, thereby minimizing the degree of reduction in EGR rate.
[0141] Referring to Table 1, which uses the difference between the condensation temperature threshold and the real-time temperature of the temperature-controlled exhaust gas (ΔT_need) as an example, Table 1 illustrates the condensation risk levels corresponding to different condensation risk ranges, as well as the control methods corresponding to each condensation risk level.
[0142] Table 1 As can be seen from the table above, when there is a risk of condensation, the embodiments of this application can provide three control modes and perform graded regulation.
[0143] For Mode 1 (i.e., reducing the flow rate of coolant in EGR cooler 1031), when the electronic equipment predicts a risk of condensation, it can first choose to adjust the speed of the electronic water pump to reduce the flow rate of coolant. This is because this operation only affects the heat exchange efficiency and does not change the path and flow rate of the exhaust gas itself. It can increase the exhaust gas temperature, has the lowest energy consumption (reduced water pump power consumption), and has the least impact on EGR rate and emissions, thus meeting the principle of energy saving priority.
[0144] For Mode 2 (i.e., adjusting the bypass valve to increase the proportion of exhaust gas flowing to the bypass branch 1034, for example, opening the bypass valve), if only Mode 1 is used to reduce the cooling capacity, it is not enough to avoid exhaust gas condensation, indicating that the risk of condensation is high. At this time, an uncooled hot exhaust gas can be introduced to mix with the cooled exhaust gas, which can quickly and efficiently increase the temperature of the mixed gas. This operation has a fast response speed and significant effect. While effectively preventing condensation, it still maintains the cooling function of the main EGR circuit, and the impact on emission targets is controllable.
[0145] For Mode 3 (i.e., reducing the opening of the EGR valve), when neither of the current two methods can raise the temperature above the condensation temperature threshold (e.g., in extremely low temperature conditions), the electronic equipment can slightly reduce the opening of the EGR valve to reduce the amount of exhaust gas recirculation. This operation means that the total amount of water vapor entering the EGR system is reduced, and more high-temperature fresh air is introduced from the source, thereby raising the temperature. This operation will slightly increase NOx emissions, but the ECU will make fine adjustments within the limits allowed by emission regulations. The core principle is to prioritize preventing hardware damage over temporary emission optimization.
[0146] With this technical solution, the three actuators (electronic water pump, EGR cooler bypass valve, and EGR valve) can be uniformly scheduled by electronic equipment. They no longer work independently, but work together as a whole to solve the core problem of anti-condensation. This achieves a dynamic optimal balance between the three goals of anti-condensation, emission protection, and low energy consumption. The EGR system prioritizes the solution using the lowest cost method and only gradually upgrades the control intensity when necessary.
[0147] It is understood that the range of condensation risk levels in Table 1 above is only an example and can be set according to needs in actual applications. This application does not identify this risk level.
[0148] After controlling the EGR system according to the above control mode, the electronic device can execute step 401 again to perform anti-condensation control in real time.
[0149] In some embodiments, the electronic device can also monitor the operating status of each device in the EGR system; if there are no abnormal devices in the EGR system, steps 401 to 405 can be executed.
[0150] If there is a device malfunctioning in the EGR system, a fault tolerance mode matching the malfunctioning device is determined; fault tolerance control is then performed based on the matched fault tolerance mode.
[0151] For example, throughout the control process, the electronic equipment continuously monitors the signals of various devices in the EGR system, such as sensor 105 (e.g., temperature, humidity, pressure sensors) and the feedback status of various actuators (e.g., bypass valve, EGR valve 104, electronic water pump 201).
[0152] If any device malfunction is detected (such as signal over-limit, jamming, or response failure), the preset fault tolerance mode matching the malfunctioning device is immediately determined.
[0153] For sensor diagnostics, electronic devices can continuously check whether the signals of each sensor are within a reasonable range and whether there are any jams or abnormal jumps. For example, if the humidity sensor fails, the ECU will detect it and immediately use a preset conservative default value (such as a default high humidity) to calculate the dew point, thereby entering a safer control mode and avoiding condensation caused by relying on incorrect data.
[0154] For actuator diagnostics, check the actuator feedback. For example, the ECU commands the bypass valve to open 50%, but the feedback signal shows it's stuck at 10%. The ECU will immediately recognize this fault and may trigger the malfunction indicator lamp. It will then skip mode two and directly use mode one or mode three to attempt compensation, ensuring the control intent is achieved.
[0155] For example, if the EGR cooler bypass valve 1032 is stuck in the closed position, the fault-tolerant mode will forcibly increase the coolant flow to the maximum and immediately reduce the opening of the EGR valve 104 to compensate. Fault-tolerant control is the highest priority to ensure engine safety and prevent condensation.
[0156] Electronic devices can continuously execute a closed-loop process of monitoring, calculation, decision-making, execution, and re-monitoring. This enables the system to respond in real time to dynamic changes in engine operating conditions (such as rapid acceleration and deceleration), ensuring that the control strategy always conforms to reality.
[0157] The electronic device in this application embodiment not only issues commands, but also continuously monitors the reliability of all sensor signals and the feedback status of actuators. It can also monitor its own status (such as communication, voltage, and software status). Once an anomaly is detected, it can immediately enter a preset fault-tolerant mode (such as using alternative values, disabling some functions, or alarming) to ensure that the risk of condensation is controlled within a safe range under any circumstances.
[0158] In other words, the embodiments of this application adopt a multi-sensor real-time monitoring and fault-tolerant control strategy, so that even if individual components fail, the system can still operate safely, and the reliability is greatly improved.
[0159] The embodiments of this application can calculate the dew point temperature under the current operating conditions in real time based on multi-parameter real-time sensing and dynamic dew point prediction models, and actively maintain the EGR exhaust gas temperature above the dew point plus safety margin, thereby physically eliminating the generation of condensate.
[0160] Furthermore, the embodiments of this application adopt a graded coordination strategy, prioritizing the fine-tuning of low-energy-consuming components such as coolant, to maximize the stability of EGR flow and NOx emission reduction effect, and avoid emission fluctuations. In other words, the above technical solution actively prevents condensation corrosion through intelligent prediction and collaborative control, which significantly reduces emissions and improves fuel economy while ensuring system safety and reliability, achieving a high-efficiency balance of safety, environmental protection and energy conservation.
[0161] Based on the same idea as the EGR system control method in the above embodiments, this application also provides a vehicle, the vehicle including an EGR system control device and an EGR system, the EGR system including: an EGR exhaust gas temperature control unit and an EGR valve, the EGR exhaust gas temperature control unit and the EGR valve being connected by a pipeline.
[0162] The EGR system control device can be used to execute the above-described EGR system control method. For ease of explanation, the structural schematic diagram of the EGR system control device embodiment only shows the parts related to the embodiments of this application. Those skilled in the art will understand that the illustrated structure does not constitute a limitation on the device, and may include more or fewer components than shown, or combine certain components, or have different component arrangements.
[0163] like Figure 5 As shown, the EGR system control device includes a threshold acquisition module 501, a risk determination module 502, an exhaust gas temperature control module 503, and a valve adjustment module 504. In some embodiments, the above modules can be programmable software instructions stored in memory and executable by a processor. It is understood that in other embodiments, the above modules can also be program instructions or firmware embedded in the processor.
[0164] The threshold acquisition module 501 is used to acquire the condensation temperature threshold of the temperature-controlled exhaust gas, wherein the temperature-controlled exhaust gas is the exhaust gas discharged from the engine that has been temperature-controlled by the EGR exhaust gas temperature control unit. Risk determination module 502 is used to determine the degree of condensation risk of the temperature-controlled exhaust gas based on the condensation temperature threshold and the temperature of the temperature-controlled exhaust gas; The exhaust gas temperature control module 503 is used to reduce the cooling level of the exhaust gas discharged from the engine through the EGR exhaust gas temperature control unit if the condensation risk level is the first condensation risk level. The valve regulating module 504 is used to control the opening degree of the EGR valve to decrease if the condensation risk level is a second condensation risk level; wherein the second condensation risk level is higher than the first condensation risk level.
[0165] Figure 6 This is a schematic diagram of an embodiment of the electronic device of this application.
[0166] The electronic device 100 includes a memory 20, a processor 30, and a computer program 40 stored in the memory 20 and executable on the processor 30. When the processor 30 executes the computer program 40, it implements the steps described in the EGR system control method embodiment above, for example... Figure 4 Steps 401 to 405 are shown.
[0167] For example, computer program 40 can also be divided into one or more modules / units, which are stored in memory 20 and executed by processor 30. The one or more modules / units can be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of computer program 40 in electronic device 100.
[0168] Those skilled in the art will understand that the schematic diagram is merely an example of the electronic device 100 and does not constitute a limitation on the electronic device 100. It may include more or fewer components than shown in the diagram, or combine certain components, or different components. For example, the electronic device 100 may also include input / output devices, network access devices, buses, etc.
[0169] Processor 30 can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. General-purpose processors can be microprocessors, single-chip microcomputers, or any conventional processor.
[0170] The memory 20 can be used to store computer programs 40 and / or modules / units. The processor 30 implements various functions of the electronic device 100 by running or executing the computer programs and / or modules / units stored in the memory 20 and by calling data stored in the memory 20. The memory 20 may mainly include a program storage area and a data storage area. The program storage area may store the operating system, application programs required for at least one function (such as sound playback function, image playback function, etc.), etc.; the data storage area may store data created according to the use of the electronic device 100 (such as audio data), etc. In addition, the memory 20 may include high-speed random access memory, and may also include non-volatile memory, such as hard disk, RAM, plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, at least one disk storage device, flash memory device, or other non-volatile solid-state storage device.
[0171] If the modules / units integrated in the electronic device 100 are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the content included in the computer-readable medium can be appropriately added or removed according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electrical carrier signals and telecommunication signals.
[0172] In the several embodiments provided in this application, it should be understood that the disclosed electronic devices and methods can be implemented in other ways. For example, the electronic device embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and other division methods may be used in actual implementation.
[0173] Furthermore, the functional units in the various embodiments of this application can be integrated into the same processing unit, or each unit can exist physically separately, or two or more units can be integrated into the same unit. The integrated units described above can be implemented in hardware or in the form of hardware plus software functional modules.
[0174] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be considered exemplary and not restrictive in all respects. Furthermore, it is clear that the word "comprising" does not exclude other units or steps, and the singular does not exclude the plural. Multiple units or electronic devices recited in the electronic device claims may also be implemented by the same unit or electronic device through software or hardware. The terms "first," "second," etc., are used to indicate names and do not indicate any particular order.
[0175] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the spirit and scope of the technical solutions of this application.
Claims
1. An EGR system control method, characterized in that, The EGR system includes: an EGR exhaust gas temperature control unit and an EGR valve, wherein the EGR exhaust gas temperature control unit and the EGR valve are connected via pipelines; the EGR system control method includes: Obtain the condensation temperature threshold of the temperature-controlled exhaust gas, wherein the temperature-controlled exhaust gas is the engine exhaust gas that has been temperature-controlled by the EGR exhaust gas temperature control unit; The degree of condensation risk of the temperature-controlled exhaust gas is determined based on the condensation temperature threshold and the temperature of the temperature-controlled exhaust gas. If the condensation risk level is the first condensation risk level, the cooling level of the engine exhaust gas is reduced by the EGR exhaust gas temperature control unit. If the condensation risk level is classified as the second condensation risk level, the opening degree of the EGR valve is reduced; wherein the second condensation risk level is higher than the first condensation risk level.
2. The EGR system control method as described in claim 1, characterized in that, The EGR exhaust gas temperature control unit includes an EGR cooler bypass valve and an EGR cooler. The inlet of the EGR cooler bypass valve is connected to the engine exhaust passage. The outlet of the EGR cooler bypass valve is provided with a cooling branch and a bypass branch. The EGR cooler is installed on the cooling branch. The bypass branch and the cooling branch merge downstream of the outlet of the EGR cooler and are connected to the inlet of the EGR valve. The step of reducing the cooling level of the engine exhaust gas through the EGR exhaust gas temperature control unit includes: Reduce the flow rate of coolant in the EGR cooler, and / or increase the proportion of exhaust gas flowing to the bypass branch via the EGR cooler bypass valve.
3. The EGR system control method as described in claim 2, characterized in that, The first condensation risk level includes a first condensation risk sub-level and a second condensation risk sub-level, wherein the first condensation risk sub-level is lower than the second condensation risk level; The reduction of the coolant flow rate in the EGR cooler, and / or the increase of the proportion of exhaust gas flowing to the bypass branch via the EGR cooler bypass valve, includes: If the condensation risk level belongs to the first condensation risk sub-level, then the step of reducing the flow rate of coolant in the EGR cooler is performed; If the condensation risk level belongs to the second condensation risk sub-level, then the step of increasing the proportion of exhaust gas flowing to the bypass branch through the EGR cooler bypass valve is performed.
4. The EGR system control method as described in claim 1, characterized in that, The method for obtaining the condensation temperature threshold of the temperature-controlled exhaust gas includes: The dew point temperature of the temperature-controlled exhaust gas is predicted to obtain the predicted dew point temperature. The condensation temperature threshold of the temperature-controlled exhaust gas is obtained based on the preset safety margin temperature and the predicted dew point temperature, and the condensation temperature threshold is greater than the predicted dew point temperature.
5. The EGR system control method as described in claim 4, characterized in that, The process of predicting the dew point temperature of the temperature-regulating exhaust gas, and obtaining the predicted dew point temperature, includes: Determine the humidity and pressure of the temperature-controlled exhaust gas; The temperature, humidity, and pressure of the temperature-controlled exhaust gas are input into a preset dynamic dew point prediction model to obtain the predicted dew point temperature of the temperature-controlled exhaust gas.
6. The EGR system control method according to any one of claims 1 to 5, characterized in that, The determination of the condensation risk level of the temperature-controlled exhaust gas based on the condensation temperature threshold and the temperature of the temperature-controlled exhaust gas includes: Calculate the difference between the condensation temperature threshold and the temperature of the temperature-controlled exhaust gas; The degree of condensation risk is determined based on the difference.
7. The EGR system control method according to any one of claims 1 to 5, characterized in that, The EGR system control method further includes: Monitor the operating status of each device in the EGR system; If there is a device malfunctioning in the EGR system, then determine the fault tolerance mode that matches the malfunctioning device. Fault tolerance control is performed based on the matched fault tolerance mode.
8. A vehicle, characterized in that, The vehicle includes an EGR system control device and an EGR system. The EGR system includes an EGR exhaust gas temperature control unit and an EGR valve, wherein the EGR exhaust gas temperature control unit and the EGR valve are connected via pipelines. The EGR system control device includes: The threshold acquisition module is used to acquire the condensation temperature threshold of the temperature-controlled exhaust gas, which is the exhaust gas discharged from the engine that has been temperature-controlled by the EGR exhaust gas temperature control unit. The risk determination module is used to determine the degree of condensation risk of the temperature-controlled exhaust gas based on the condensation temperature threshold and the temperature of the temperature-controlled exhaust gas. An exhaust gas temperature control module is used to reduce the cooling level of the exhaust gas discharged from the engine by means of the EGR exhaust gas temperature control unit if the condensation risk level is the first condensation risk level. The valve regulating module is used to control the opening degree of the EGR valve to decrease if the condensation risk level is at the second condensation risk level; wherein the second condensation risk level is higher than the first condensation risk level.
9. An electronic device, the electronic device comprising a processor and a memory, characterized in that, The memory is used to store instructions, and the processor is used to call the instructions in the memory to cause the electronic device to execute the EGR system control method as described in any one of claims 1 to 7.
10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that, when executed on an electronic device, cause the electronic device to perform the EGR system control method as described in any one of claims 1 to 7.