Humidity control method of exhaust gas recirculation system of automobile engine and related equipment

Abstract

The invention discloses a humidity control method for an exhaust gas recirculation (EGR) system of an automobile engine and related equipment, and relates to the technical field of vehicles, the EGR system of the vehicle comprises temperature and humidity detection equipment, an intake manifold and an EGR valve, and the temperature and humidity detection equipment is used for detecting the first temperature and humidity of air at an inlet of the EGR system; the method comprises the steps that the mass flow of air, the EGR gas water content of an EGR system, the second temperature of an intake manifold, the pressure of the intake manifold, the first temperature and the humidity are obtained; based on the mass flow rate of the air, the water content of the EGR gas, the second temperature, the pressure, the first temperature and the humidity, the condensate water precipitation amount is obtained; and controlling the humidity of the EGR system based on the condensed water precipitation amount. The humidity of the EGR system is controlled through the condensate water precipitation amount, and therefore it is ensured that the engine is not on fire.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to a humidity control method and related equipment for an exhaust gas recirculation system of an automobile engine. Background Technology

[0002] Under the dual pressures of energy and environmental crises, the automotive industry is rapidly shifting from traditional gasoline-powered vehicles to new energy vehicles, with electrification becoming the recognized development trend. However, the development of pure electric vehicles is significantly limited by the shortcomings of power batteries in terms of cost, energy storage, and safety performance. Against this backdrop, hybrid passenger vehicles will continue to occupy the majority of the new energy vehicle market share in the medium to long term. Hybrid systems place higher and more stringent demands on engine thermal efficiency and fuel economy, requiring the continuous introduction of new technologies and mechanisms to achieve these goals. Among these, Exhaust Gas Recirculation (EGR) technology is one of the effective technical means to improve the thermal efficiency of hybrid-specific engines.

[0003] The exhaust gas from the low-pressure EGR system of a turbocharged gasoline engine passes through the turbocharger compressor and is then cooled by a water-cooled intercooler before entering the intake manifold. When the ambient humidity is high, the high-temperature water vapor in the fresh air and EGR exhaust gas is cooled by the water-cooled intercooler, resulting in a decrease in temperature. Under certain operating conditions, a large amount of condensate will be generated at the rear of the water-cooled intercooler. When the operating conditions change drastically, the condensate will enter the cylinder all at once, causing engine misfire and affecting the normal use of the vehicle. Summary of the Invention

[0004] The embodiments of this application provide a humidity control method and related equipment for an exhaust gas recirculation system of an automobile engine, thereby ensuring that the engine does not misfire, at least to a certain extent, by controlling the humidity of the EGR system.

[0005] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This summary section is not intended to limit the key and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0006] This application specifically includes the following aspects:

[0007] In a first aspect, this application proposes a humidity control method for an exhaust gas recirculation (EGR) system. The EGR system of a vehicle includes a temperature and humidity detection device, an intake manifold, and an EGR valve. The temperature and humidity detection device is used to detect the initial temperature and humidity of the air at the EGR system inlet. The method includes:

[0008] The mass flow rate of the air, the water content of the EGR gas in the EGR system, the second temperature of the intake manifold, the pressure of the intake manifold, the first temperature, and the humidity are obtained.

[0009] The amount of condensate precipitated is obtained based on the mass flow rate of the air, the water content of the EGR gas, the second temperature, the pressure, the first temperature, and the humidity.

[0010] The humidity of the EGR system is controlled based on the amount of condensate produced.

[0011] In one feasible implementation, controlling the humidity of the EGR system based on the amount of condensate precipitation includes:

[0012] The target EGR rate of the EGR system is determined based on the amount of condensate released.

[0013] The opening degree of the EGR valve is controlled according to the target EGR rate to control the humidity of the EGR system.

[0014] In one feasible implementation, determining the target EGR rate of the EGR system based on the amount of condensate precipitation includes:

[0015] When the amount of condensate precipitation is less than or equal to zero, the first EGR rate is determined as the target EGR rate; wherein, the first EGR rate is the maximum EGR rate determined by bench calibration under the current operating conditions.

[0016] In one feasible implementation, determining the target EGR rate of the EGR system based on the amount of condensate precipitation includes:

[0017] When the amount of condensate precipitation is greater than zero, the second EGR rate is set as the target EGR rate; wherein, the second EGR rate is the maximum EGR rate corresponding to the preset amount of condensate precipitation under the current operating conditions, the preset amount of condensate precipitation is less than or equal to 0, and the second EGR rate is less than the first EGR rate.

[0018] In one feasible implementation, obtaining the condensate precipitation amount based on the air mass flow rate, the EGR gas moisture content, the second temperature, the pressure, the first temperature, and the humidity includes:

[0019] The air moisture content is obtained based on the air mass flow rate, the first temperature, and the humidity.

[0020] The sum of the air moisture content and the EGR gas moisture content is taken as the moisture content of the mixed gas;

[0021] Based on the pressure and the second temperature, the target water capacity is determined;

[0022] The difference between the water content of the mixed gas and the target water capacity is taken as the amount of condensate released.

[0023] Secondly, this application also proposes a humidity control device for an exhaust gas recirculation (EGR) system, applied to the humidity control method of the exhaust gas recirculation system described in any of the above embodiments. The vehicle's EGR system includes a temperature and humidity detection device, an intake manifold, and an EGR valve. The temperature and humidity detection device is used to detect the first temperature and humidity of the air at the EGR system inlet. The device includes:

[0024] The data acquisition module is used to acquire the mass flow rate of the air, the water content of the EGR gas in the EGR system, the second temperature of the intake manifold, the pressure of the intake manifold, the first temperature, and the humidity;

[0025] A water volume calculation module is used to obtain the amount of condensate precipitation based on the mass flow rate of the air, the water content of the EGR gas, the second temperature, the pressure, the first temperature, and the humidity.

[0026] A dynamic adjustment module is used to control the humidity of the EGR system based on the amount of condensate produced.

[0027] Thirdly, this application also proposes a humidity control device for an exhaust gas recirculation system, comprising: a memory and a processor, characterized in that the processor is used to execute a computer program stored in the memory to implement the steps of the humidity control method for the exhaust gas recirculation system as described in any of the above embodiments.

[0028] Fourthly, this application also proposes a vehicle including an EGR system and a humidity control device for the exhaust gas recirculation system described in the above embodiments, wherein the EGR system includes a temperature and humidity detection device, an intake manifold, and an EGR valve.

[0029] In one feasible implementation, the EGR system further includes an air filter and an EGR mixing valve, with the temperature and humidity detection device disposed between the air filter and the EGR mixing valve.

[0030] Fifthly, this application also proposes a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the humidity control method for the exhaust gas recirculation system as described in any of the above embodiments.

[0031] This application proposes a humidity control method and related equipment for an exhaust gas recirculation (EGR) system. By adding a temperature and humidity sensor to collect fresh air humidity in real time, and calculating the amount of condensate under various conditions using a preset formula, the optimal EGR rate is dynamically controlled. This maximizes the EGR rate while ensuring the engine does not experience condensation misfire, achieving optimal fuel economy. This further solves the problem of existing solutions failing to accurately identify condensation misfire and relying on calibration control to limit the EGR rate to a low level to prevent condensation misfire.

[0032] This application discloses a humidity control method and related equipment for an exhaust gas recirculation system. Other advantages, objectives and features of this application will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this application. Attached Figure Description

[0033] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit this specification. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0034] Figure 1 A flowchart illustrating a humidity control method for an exhaust gas recirculation system provided in an embodiment of this application;

[0035] Figure 2 A schematic diagram of the structure of a vehicle's exhaust gas recirculation (EGR) system provided in an embodiment of this application;

[0036] Figure 3 A schematic diagram of water volume control and EGR rate control based on a humidity sensor is provided for embodiments of this application.

[0037] Figure 4 A schematic diagram of the structure of a humidity control device for an exhaust gas recirculation system provided in an embodiment of this application;

[0038] Figure 5 This is a schematic diagram of the structure of a humidity control device for an exhaust gas recirculation system provided in an embodiment of this application. Detailed Implementation

[0039] To better understand the technical solutions provided in the embodiments of this specification, the technical solutions of the embodiments of this specification will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0040] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, 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 said element. The term "two or more" includes two or more cases.

[0041] This application provides an embodiment of a vehicle's exhaust gas recirculation (EGR) system, such as... Figure 2 As shown, the system includes an EGR valve 1, an EGR cooler 2, an EGR mixing valve 3, a turbocharger compressor 4, a first temperature sensor 5, a water-cooled intercooler 6, a throttle body 7, an intake manifold 8, a second temperature sensor 9, a cylinder 10, a turbocharger turbine 11, an exhaust pipe 12, an air filter 13, an air pipe 14, and a temperature and humidity detection device 15, wherein:

[0042] The outlet of air filter 13 is connected to the inlet of air pipe 14, and the outlet of air pipe 14 is connected to the inlet of EGR mixing valve 3; the outlet of EGR mixing valve 3 is connected to the inlet of turbocharger compressor 4, and the outlet of turbocharger compressor 4 is connected to the inlet of water-cooled intercooler 6; the outlet of water-cooled intercooler 6 is connected to the inlet of throttle valve 7, and the outlet of throttle valve 7 is connected to the inlet of intake manifold 8; the outlet of intake manifold 8 is connected to the intake port of cylinder 10, and the exhaust port of cylinder 10 is connected to the inlet of turbocharger turbine 11; the outlet of turbocharger turbine 11 is connected to the inlet of exhaust pipe 12, and the outlet of exhaust pipe 12 is connected to the inlet of EGR cooler 2; the outlet of EGR cooler 2 is connected to the inlet of EGR valve 1, and the outlet of EGR valve 1 is connected to the inlet of turbocharger compressor 4.

[0043] Temperature and humidity detection device 15 is installed on the wall of air pipe 14; first temperature sensor 5 is installed on the wall of water-cooled intercooler 6; second temperature sensor 9 is installed on the wall of intake manifold 8.

[0044] For example, under normal circumstances, the intake air flow path of a new energy vehicle engine with a low-pressure EGR system is as follows: fresh air passes through the air filter 13, enters the air pipe 14, and then passes through the EGR mixing valve 3; after the engine exhaust gas is discharged from the cylinder 10, it passes through the turbocharger turbine 11 and flows to the exhaust pipe 12; after the EGR system exhaust gas is drawn from the exhaust pipe 12, it enters the EGR cooler 2 for cooling, and the cooled exhaust gas then passes through the EGR valve 1 and flows into the EGR mixing valve 3. The fresh air and EGR gas are mixed in front of the turbocharger compressor 4. After the mixture passes through the turbocharger compressor 4, the temperature rises, and after passing through the water-cooled intercooler 6 for cooling, it enters the throttle valve 7 and the intake manifold 8 in sequence, and finally flows into the cylinder 10. After the engine injects fuel, it is burned to do power.

[0045] Because EGR gas contains a large amount of water vapor, and the air humidity is high or it's raining, the water vapor content in the fresh air is also high. This large amount of water vapor in the air-fuel mixture, after passing through the turbocharger compressor 4 and then cooling down through the water-cooled intercooler 6, causes a large amount of condensate to be drawn into the cylinder 10, which can cause engine misfire. This misfire area is particularly pronounced when the second temperature sensor 9 measures below 30°C. To avoid misfires, the EGR rate is generally reduced to decrease the EGR gas content, thereby reducing the water vapor content. However, to ensure no misfires occur under the highest ambient humidity conditions, the EGR rate is reduced significantly (up to 10%), and sometimes the EGR function needs to be turned off, greatly diminishing fuel efficiency.

[0046] To address the aforementioned issues, the Exhaust Gas Recirculation (EGR) system for vehicles provided in this application includes a temperature and humidity detection device 15, an intake manifold 8, and an EGR valve 1. The temperature and humidity detection device 15 is used to detect the initial temperature and humidity of the air entering the EGR system. Specifically, the temperature and humidity detection device 15 provided in this application is dedicated to measuring the initial temperature and humidity of the air drawn into the engine's intake system. Its core components include a capacitive humidity sensor element, a bandgap temperature sensor, and corresponding processing circuitry, all integrated into a single silicon chip embedded in a plastic housing. The capacitive humidity sensor element has a notch, ensuring direct moisture exchange between the humid environment and the hygroscopic polymer layer of the humidity sensor element. A filter membrane integrated on the frame above the sensor is permeable to moisture but prevents water and dirt penetration. The temperature and humidity detection device 15 is mounted on the air duct 14, and its placement and angle must meet design specifications.

[0047] Furthermore, the temperature and humidity detection device 15 has two output interfaces for transmitting signals to the engine's electronic control unit (ECU), including relative humidity output and temperature output. The sensor uses a pre-configured pulse width modulation (PWM) interface, with PWM based on a constant fundamental frequency with a period of tF. Humidity and temperature signals are provided with duty cycles (tPW / tF) on this fundamental frequency, and measurement data is provided as a PWM bit stream on the corresponding output pins, outputting the fresh air humidity in real time.

[0048] Please see Figure 1 , Figure 1 This application provides a flowchart illustrating a humidity control method for an exhaust gas recirculation system, which may include:

[0049] S110, obtain the mass flow rate of air, the moisture content of the EGR gas in the EGR system, the second temperature of the intake manifold 8, the pressure of the intake manifold 8, the first temperature and humidity;

[0050] For example, during the operation of a new energy vehicle, the temperature and humidity detection device 15 installed on the air pipe 14 monitors the initial temperature and humidity of the air entering the EGR system in real time (the initial temperature and relative humidity of fresh air entering the EGR system). Simultaneously, the ECU collects the air mass flow rate (the volumetric flow rate of fresh air entering the engine), the EGR exhaust gas water content (the water vapor content in the recirculated exhaust gas), the second temperature of the intake manifold 8 (the temperature of the exhaust gas before it enters the cylinder 10 after mixing with fresh air), and the pressure of the intake manifold 8 (the pressure of the mixed gas). This multi-dimensional parameter collection provides a comprehensive data foundation for subsequent condensate water calculations, avoiding insufficient control accuracy due to the lack of a single parameter.

[0051] S120. Based on the air mass flow rate, EGR gas moisture content, second temperature, pressure, first temperature, and humidity, the amount of condensate is obtained.

[0052] In some examples, the amount of condensate produced is determined based on the air mass flow rate, EGR gas moisture content, second temperature, pressure, first temperature, and humidity, including:

[0053] The air moisture content is obtained based on the air mass flow rate, initial temperature, and humidity.

[0054] The sum of the moisture content of the air and the moisture content of the EGR gas is taken as the moisture content of the mixed gas;

[0055] The target water capacity is determined based on pressure and second temperature.

[0056] The difference between the water content of the mixed gas and the target water capacity is used as the amount of condensate released.

[0057] For example, in a high-humidity environment, assuming the calculated air moisture content is 12 g / kg, the EGR gas moisture content is 15 g / kg, and the total moisture content of the mixture is 27 g / kg. Based on the temperature of 40°C and the pressure of 100 kPa in the intake manifold 8, the target water capacity is found to be 25 g / kg according to the saturated vapor meter. Therefore, the condensate precipitation amount is 27 - 25 = 2 g / kg. At this point, the EGR system determines that there is a risk of condensation.

[0058] S130, Humidity control of the EGR system based on condensate precipitation.

[0059] For example, the ECU automatically adjusts the opening of EGR valve 1 in the EGR system to change the exhaust gas recirculation ratio based on the positive or negative value of the amount of condensate produced.

[0060] In some examples, the humidity of the EGR system is controlled based on the amount of condensate produced, including:

[0061] Determine the target EGR rate of the EGR system based on the amount of condensate precipitation;

[0062] The opening degree of the EGR valve is controlled according to the target EGR rate to control the humidity of the EGR system.

[0063] For example, a target EGR rate (i.e., the optimal exhaust gas recirculation ratio) is first determined based on the calculated amount of condensate precipitation, and then this target rate is achieved by adjusting the opening of the EGR valve, thereby precisely controlling the humidity of the EGR system.

[0064] In some examples, the target EGR rate of the EGR system is determined based on the amount of condensate removed, including:

[0065] When the amount of condensate precipitation is less than or equal to zero, the first EGR rate is determined as the target EGR rate; wherein, the first EGR rate is the maximum EGR rate determined by bench calibration under the current operating conditions.

[0066] For example, when the calculated condensate precipitation is less than or equal to 0 (i.e., the water content of the air-fuel mixture does not exceed the target capacity, and there is no risk of condensation), the EGR system sets the target EGR rate to the first EGR rate. This value is the maximum permissible EGR rate calibrated for different operating conditions in bench tests. For instance, in a dry environment, the calculated condensate precipitation is less than 0 (no risk of condensation). In this case, the EGR system automatically calls the maximum EGR rate calibrated on the bench: if the vehicle is cruising at 100 km / h, the EGR rate is set to 25%; if it is idling, the EGR rate is set to 10%, ensuring optimal fuel-saving performance under different operating conditions.

[0067] In some examples, the target EGR rate of the EGR system is determined based on the amount of condensate removed, including:

[0068] When the amount of condensate precipitation is greater than zero, the second EGR rate is set as the target EGR rate; wherein, the second EGR rate is the maximum EGR rate corresponding to the preset amount of condensate precipitation under the current operating conditions, and the preset amount of condensate precipitation is less than or equal to 0, and the second EGR rate is less than the first EGR rate.

[0069] For example, when the amount of condensate precipitation is greater than 0 (posing a risk of condensation), the EGR system switches the target EGR rate to a second EGR rate. This second EGR rate is a preset safety threshold (ensuring that the amount of condensate precipitation is ≤0) and is always lower than the first EGR rate. The second EGR rate is pre-stored in the ECU depending on the engine model and is usually lower than the first EGR rate. For instance, in heavy rain, if the EGR system detects that the amount of condensate precipitation is greater than 0, it immediately reduces the EGR rate from the first EGR rate to the second EGR rate. At this time, the water content of the air-fuel mixture decreases to below the target capacity, eliminating the risk of condensation. Therefore, this application achieves a dynamic balance between efficiency and safety through a dual EGR rate mechanism, ensuring engine reliability under extreme operating conditions.

[0070] In one specific implementation, such as Figure 3 As shown, the moisture content of fresh air + moisture content of EGR gas = moisture content of the air-fuel mixture. When the moisture content of the air-fuel mixture is less than or equal to the amount of water that the gas after the water-cooled intercooler can hold (i.e., the comparison result of moisture content of air-fuel mixture - amount of water that the gas after the water-cooled intercooler can hold > 0 is "no"), it means that water vapor in the gas after passing through the water-cooled intercooler will not precipitate into liquid water, and there is no risk of condensation and misfire. At this time, the result of this condition is fed back to the ECU, the humidity control mode is exited, and the engine will operate according to the maximum EGR rate that can be achieved at each EGR activation point during bench calibration, which can effectively improve the engine's fuel economy.

[0071] When the moisture content of the air-fuel mixture exceeds the amount of water that the gas after the water-cooled intercooler can hold (i.e., the comparison result of air-fuel mixture moisture content - amount of water that the gas after the water-cooled intercooler can hold > 0), the result is "yes." This means that water vapor in the gas will precipitate as liquid water after passing through the water-cooled intercooler, which may cause misfire due to condensation. At this time, the result is fed back to the ECU to activate the humidity control mode and activate the water difference value already set in the control software, i.e., the preset value of air-fuel mixture moisture content - amount of water that the gas after the water-cooled intercooler can hold. This value is ≤ 0 and can be set according to different engine performance and fuel consumption requirements to solve for a new EGR rate. This EGR rate is smaller than the maximum EGR rate that can be achieved at each EGR activation point during engine bench calibration and is dynamically adjusted according to different conditions to ensure that the engine will not misfire under different vehicle operating conditions.

[0072] It should be noted that the above embodiments are merely best examples and are not intended to limit the implementation of this application.

[0073] Furthermore, such as Figure 4 As shown, this application embodiment also provides a humidity control device for an exhaust gas recirculation system, applied to the humidity control method of the exhaust gas recirculation system in any of the above embodiments. The vehicle's exhaust gas recirculation (EGR) system includes a temperature and humidity detection device, an intake manifold, and an EGR valve. The temperature and humidity detection device is used to detect the first temperature and humidity of the air at the EGR system inlet. The device includes:

[0074] Data acquisition module 21 is used to acquire the mass flow rate of air, the water content of EGR gas in the EGR system, the second temperature of the intake manifold, the pressure of the intake manifold, the first temperature and humidity;

[0075] The water volume calculation module 22 is used to obtain the amount of condensate based on the mass flow rate of air, the water content of EGR gas, the second temperature, the pressure, the first temperature, and the humidity.

[0076] The dynamic adjustment module 23 is used to control the humidity of the EGR system based on the amount of condensate.

[0077] In summary, this application uses a newly added humidity sensor to collect fresh air humidity in real time and calculates the amount of condensate under various conditions using a preset formula to dynamically control the optimal EGR rate. This maximizes the EGR rate while ensuring the engine does not experience condensation misfire, achieving the best fuel-saving effect. This overcomes the shortcomings of existing solutions that cannot accurately identify the amount of condensation misfire and rely on calibration control to limit the EGR rate to a low level to prevent condensation misfire.

[0078] Furthermore, such as Figure 5 As shown in the figure, this application embodiment also provides a humidity control device 300 for an exhaust gas recirculation system, including: a memory 320 and a processor 310, characterized in that the processor 310 is used to execute the computer program 321 stored in the memory 320 to implement the steps of the humidity control method of any of the above-mentioned exhaust gas recirculation systems.

[0079] Since the electronic device described in this embodiment is the device used to implement a hybrid vehicle shift control method in the embodiments of this application, those skilled in the art can understand the specific implementation method and various variations of the electronic device in this embodiment based on the method described in the embodiments of this application. Therefore, how the electronic device implements the method in the embodiments of this application will not be described in detail here. Any device used by those skilled in the art to implement the method in the embodiments of this application falls within the scope of protection of this application.

[0080] In practical implementation, when the computer program 321 is executed by the processor, it can achieve the following: Figure 1 Any of the corresponding implementation methods in the embodiments.

[0081] Furthermore, this application also proposes a vehicle including an EGR system and a humidity control device for the exhaust gas recirculation system proposed in the above embodiments, wherein the EGR system includes a temperature and humidity detection device, an intake manifold, and an EGR valve.

[0082] In some examples, the EGR system also includes an air filter and an EGR mixing valve, with temperature and humidity sensors positioned between the air filter and the EGR mixing valve.

[0083] Furthermore, this application also proposes a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the humidity control method for any of the above-described exhaust gas recirculation systems.

[0084] It should be noted that the descriptions of each embodiment in the above embodiments have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0085] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-readable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-readable program code.

[0086] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create a machine for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0087] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0088] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0089] This application also provides a computer program product including computer software instructions that, when executed on a processing device, cause the processing device to execute a hybrid vehicle shift control method.

[0090] A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the flow or function according to the embodiments of this application is generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium may be any available medium that a computer can store or a data storage device such as a server or data center that integrates one or more available media. The available medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid-state disk (SSD)).

[0091] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0092] In the several embodiments provided in this application, it should be understood that the disclosed devices, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, or indirect coupling or communication connection between devices or units, and may be electrical, mechanical, or other forms.

[0093] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0094] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0095] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0096] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

[0097] Although preferred embodiments have been described in this specification, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this specification.

[0098] Obviously, those skilled in the art can make various modifications and variations to this specification without departing from its spirit and scope. Therefore, if such modifications and variations fall within the scope of the claims and their equivalents, this specification is also intended to include such modifications and variations.

Claims

1. A humidity control method for an exhaust gas recirculation system, characterized in that, The vehicle's exhaust gas recirculation (EGR) system includes a temperature and humidity detection device, an intake manifold, and an EGR valve. The temperature and humidity detection device is used to detect the initial temperature and humidity of the air entering the EGR system. The method includes: The mass flow rate of the air, the water content of the EGR gas in the EGR system, the second temperature of the intake manifold, the pressure of the intake manifold, the first temperature, and the humidity are obtained. The amount of condensate precipitated is obtained based on the mass flow rate of the air, the water content of the EGR gas, the second temperature, the pressure, the first temperature, and the humidity. The humidity of the EGR system is controlled based on the amount of condensate produced.

2. The humidity control method for the waste gas recirculation system according to claim 1, characterized in that, The method of controlling the humidity of the EGR system based on the amount of condensate precipitation includes: The target EGR rate of the EGR system is determined based on the amount of condensate released. The opening degree of the EGR valve is controlled according to the target EGR rate to control the humidity of the EGR system.

3. The humidity control method for the waste gas recirculation system according to claim 2, characterized in that, Determining the target EGR rate of the EGR system based on the amount of condensate precipitation includes: When the amount of condensate precipitation is less than or equal to zero, the first EGR rate is determined as the target EGR rate; wherein, the first EGR rate is the maximum EGR rate determined by bench calibration under the current operating conditions.

4. The humidity control method for the waste gas recirculation system according to claim 3, characterized in that, Determining the target EGR rate of the EGR system based on the amount of condensate precipitation includes: When the amount of condensate precipitation is greater than zero, the second EGR rate is set as the target EGR rate; wherein, the second EGR rate is the maximum EGR rate corresponding to the preset amount of condensate precipitation under the current operating conditions, the preset amount of condensate precipitation is less than or equal to 0, and the second EGR rate is less than the first EGR rate.

5. The humidity control method for the exhaust gas recirculation system according to any one of claims 1 to 4, characterized in that, The method of obtaining the condensate precipitation amount based on the air mass flow rate, the EGR gas moisture content, the second temperature, the pressure, the first temperature, and the humidity includes: The air moisture content is obtained based on the air mass flow rate, the first temperature, and the humidity. The sum of the air moisture content and the EGR gas moisture content is taken as the moisture content of the mixed gas; Based on the pressure and the second temperature, the target water capacity is determined; The difference between the water content of the mixed gas and the target water capacity is taken as the amount of condensate released.

6. A humidity control device for an exhaust gas recirculation system, characterized in that, A humidity control method for an exhaust gas recirculation (EGR) system applied to any one of the above 1 to 5, wherein the vehicle's EGR system includes a temperature and humidity detection device, an intake manifold, and an EGR valve, wherein the temperature and humidity detection device is used to detect a first temperature and humidity of the air at the EGR system inlet; the device includes: The data acquisition module is used to acquire the mass flow rate of the air, the water content of the EGR gas in the EGR system, the second temperature of the intake manifold, the pressure of the intake manifold, the first temperature, and the humidity; A water volume calculation module is used to obtain the amount of condensate precipitation based on the mass flow rate of the air, the water content of the EGR gas, the second temperature, the pressure, the first temperature, and the humidity. A dynamic adjustment module is used to control the humidity of the EGR system based on the amount of condensate produced.

7. A humidity control device for an exhaust gas recirculation system, comprising: The memory and processor are characterized in that the processor is used to execute a computer program stored in the memory to implement the steps of the humidity control method for the exhaust gas recirculation system as described in any one of claims 1 to 5.

8. A vehicle, characterized in that, The system includes an EGR system and a humidity control device for the exhaust gas recirculation system according to claim 7, wherein the EGR system includes a temperature and humidity detection device, an intake manifold, and an EGR valve.

9. The vehicle according to claim 8, characterized in that, The EGR system also includes an air filter and an EGR mixing valve, and the temperature and humidity detection device is located between the air filter and the EGR mixing valve.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the humidity control method for the exhaust gas recirculation system as described in any one of claims 1 to 5.

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