Flow detection method and system for exhaust gas recirculation system in vehicle and vehicle

Abstract

The invention discloses a flow detection method and system for an exhaust gas recirculation system in a vehicle and the vehicle. The method can be at least applied to the field of vehicles and comprises the steps that an engine is controlled to enter an idle state; when the engine is in an idling state, pressure information of waste gas in the gas inlet channel is detected; based on the pressure information, the exhaust state of the engine in the exhaust gas exhausting process is determined; and in response to the exhaust state being the stable exhaust state, the flow of exhaust gas in the exhaust gas recirculation system is detected, and a flow detection result is obtained. The technical problem that flow detection of the exhaust gas recirculation system is high in limitation is solved.

Description

Technical Field

[0001] The present invention relates to the field of vehicles, and in particular to a flow detection method and system of an exhaust gas recirculation system in a vehicle, and a vehicle. Background Art

[0002] At present, in the exhaust gas recirculation system of the vehicle, a pressure sensor is often used to detect the absolute pressure value of the exhaust gas in the intake duct, and a temperature sensor is also used to detect the temperature value of the exhaust gas in the intake duct, thereby calculating the flow rate of the exhaust gas in the exhaust gas recirculation system.

[0003] In addition to the above calculation method, a flow meter can also be used to directly measure the flow of exhaust gas in the exhaust gas recirculation system. However, in actual operation, such a direct measurement method is difficult to implement, resulting in a technical problem that the flow detection of the exhaust gas recirculation system is highly limited.

[0004] With respect to the technical problem of high limitations in flow rate detection of the above-mentioned exhaust gas recirculation system, no effective solution has been proposed so far. Summary of the invention

[0005] The embodiments of the present invention provide a flow detection method, system and vehicle for an exhaust gas recirculation system in a vehicle, so as to at least solve the technical problem that the flow detection of the exhaust gas recirculation system is highly limited.

[0006] According to one aspect of an embodiment of the present invention, a method for detecting the flow rate of an exhaust gas recirculation system in a vehicle is provided. The vehicle includes an engine and an exhaust gas recirculation system. The exhaust gas exhausted by the engine enters an intake duct of the exhaust gas recirculation system. The method may include: controlling the engine to enter an idling state; when the engine is in the idling state, detecting pressure information of the exhaust gas in the intake duct; based on the pressure information, determining the exhaust state of the engine in the process of exhausting the exhaust gas; in response to the exhaust state being a stable exhaust state, detecting the flow rate of the exhaust gas in the exhaust gas recirculation system to obtain a flow detection result.

[0007] Optionally, based on the pressure information, the exhaust state of the engine during the process of exhausting exhaust gas is determined, including: in response to the pressure information being less than a first pressure information threshold, the pressure information is in a stable state, and the airflow of the exhaust gas is in a steady state, determining that the exhaust state is a stable exhaust state.

[0008] Optionally, in response to the exhaust state being a stable exhaust state, the flow rate of exhaust gas in the exhaust gas recirculation system is detected to obtain a flow rate detection result, including: in response to the exhaust state being a stable exhaust state, controlling the valve body of the exhaust gas recirculation system to perform a self-inspection operation to obtain a self-inspection result, wherein the valve body is connected to the intake duct; in response to the self-inspection result being that the valve body self-inspection passes, the flow rate of exhaust gas in the exhaust gas recirculation system is detected to obtain a flow rate detection result.

[0009] Optionally, in response to the exhaust state being a stable exhaust state, the valve body of the exhaust gas recirculation system is controlled to perform a self-inspection operation to obtain a self-inspection result, including: in response to the exhaust state being a stable exhaust state, opening the initial opening of the valve body to a target opening; determining the pressure information difference between the pressure information corresponding to the target opening and the pressure information corresponding to the valve body when the valve body is closed; in response to the pressure information difference being less than or equal to a second pressure information threshold, controlling the valve body with the target opening to perform a self-inspection operation to obtain a self-inspection result.

[0010] Optionally, the method further includes: in response to the pressure information difference being greater than a second pressure information threshold and the engine being in a stable exhaust state, using the exhausted exhaust gas to clean particulate matter in the valve body.

[0011] Optionally, the method further includes: in response to the pressure information difference being greater than a second pressure information threshold, inputting clean gas into a pipeline of the exhaust gas recirculation system to clean particulate matter in the pipeline, wherein the pipeline is connected to an intake passage.

[0012] Optionally, controlling the engine to enter an idling state includes: controlling the vehicle to operate in a deceleration and fuel cut-off condition; and in the deceleration and fuel cut-off condition, using the inertia of the vehicle to drive the engine to enter an idling state.

[0013] Optionally, controlling the vehicle to operate in a deceleration and fuel cut-off condition includes: in response to the engine speed being within a speed threshold range, the engine water temperature being greater than a temperature threshold, and the vehicle speed being greater than a speed threshold, determining that the vehicle is operating in a deceleration and fuel cut-off condition, wherein the number of times the vehicle operates in the deceleration and fuel cut-off condition is less than or equal to a number threshold.

[0014] According to another aspect of an embodiment of the present invention, a flow detection device for an exhaust gas recirculation system in a vehicle is also provided. The vehicle includes an engine and an exhaust gas recirculation system. The exhaust gas exhausted by the engine enters an intake duct of the exhaust gas recirculation system. The device may include: a control unit, used to control the engine to enter an idling state; a first detection unit, used to detect pressure information of the exhaust gas in the intake duct when the engine is in an idling state; a determination unit, used to determine the exhaust state of the engine in the process of exhausting the exhaust gas based on the pressure information; and a second detection unit, used to detect the flow of the exhaust gas in the exhaust gas recirculation system in response to the exhaust state being a stable exhaust state, to obtain a flow detection result.

[0015] Optionally, the determination unit may include: a determination module for determining that the exhaust state is a stable exhaust state in response to the pressure information being less than a first pressure information threshold, the pressure information being in a stable state, and the exhaust gas flow being in a steady state.

[0016] Optionally, the second detection unit may include: a self-test module, used to control the valve body of the exhaust gas recirculation system to perform a self-test operation in response to the exhaust state being a stable exhaust state, and obtain a self-test result, wherein the valve body is connected to the intake duct; a detection module, used to detect the flow of exhaust gas in the exhaust gas recirculation system in response to the self-test result being that the valve body self-test passed, and obtain a flow detection result.

[0017] Optionally, the self-test module may include: an opening submodule, used to open the initial opening of the valve body to a target opening in response to the exhaust state being a stable exhaust state; a determination submodule, used to determine the pressure information difference between the pressure information corresponding to the target opening and the pressure information corresponding to the valve body in a closed state; a self-test submodule, used to control the valve body with a target opening to perform a self-test operation in response to the pressure information difference being less than or equal to a second pressure information threshold, and obtain a self-test result.

[0018] Optionally, the device may further include: a first cleaning unit for cleaning particulate matter in the valve body using the exhausted exhaust gas in response to the pressure information difference being greater than the second pressure information threshold and the engine being in a stable exhaust state.

[0019] Optionally, the device may also include: a second cleaning unit, for inputting cleaning gas into a pipeline of the exhaust gas recirculation system in response to the pressure information difference being greater than a second pressure information threshold, so as to clean particulate matter in the pipeline, wherein the pipeline is connected to the intake duct.

[0020] Optionally, the control unit may include: a control module for controlling the vehicle to operate in a deceleration and fuel cut-off condition; and a driving module for driving the engine into an idling state by utilizing the inertia of the vehicle under the deceleration and fuel cut-off condition.

[0021] Optionally, the control module may include: a determination submodule for determining that the vehicle is operating in a deceleration and fuel cut-off condition in response to the engine speed being within a speed threshold range, the engine water temperature being greater than a temperature threshold, and the vehicle speed being greater than a speed threshold, wherein the number of times the vehicle operates in the deceleration and fuel cut-off condition is less than or equal to a number threshold.

[0022] According to another aspect of an embodiment of the present invention, a flow detection system for an exhaust gas recirculation system in a vehicle is also provided. The system may include: a controller for controlling an engine in a vehicle to enter an idling state, wherein the exhaust gas discharged by the engine enters an intake duct of the exhaust gas recirculation system in the vehicle; a pressure sensor for detecting pressure information of the exhaust gas in the intake duct when the engine is in an idling state; and a flow detector for determining the exhaust state of the engine in the process of exhausting the exhaust gas based on the pressure information, and in response to the exhaust state being a stable exhaust state, detecting the flow of the exhaust gas in the exhaust gas recirculation system to obtain a flow detection result.

[0023] According to another aspect of an embodiment of the present invention, a vehicle is provided, comprising: a memory storing an executable program; and a processor for running the program, wherein the program executes any one of the above methods when running.

[0024] According to another aspect of an embodiment of the present invention, a computer-readable storage medium is provided, the computer-readable storage medium including a stored executable program, wherein when the executable program runs, the device where the storage medium is located is controlled to execute any one of the above methods.

[0025] According to yet another aspect of an embodiment of the present invention, a computer program product is provided. The computer program product includes a computer program. When the computer program is executed by a processor, any one of the above methods is implemented.

[0026] In an embodiment of the present invention, when the flow rate of the exhaust gas recirculation system in the vehicle is detected, the engine can be controlled to enter an idling state. When the engine is in an idling state, the pressure information of the exhaust gas in the intake duct can be detected, and according to the detected pressure information of the exhaust gas in the intake duct, the exhaust state of the engine in the process of exhausting the exhaust gas can be determined, and in response to the exhaust state being a stable exhaust state, the flow rate of the exhaust gas in the exhaust gas recirculation system is detected, and a flow rate detection result can be obtained. Since in the embodiment of the present application, when the engine is controlled to enter an idling state, the pressure information of the exhaust gas in the intake duct can be detected, and according to the detected pressure information, the exhaust state of the engine in the process of exhausting the exhaust gas can be determined, if the determined exhaust state is a stable exhaust state, the flow rate of the exhaust gas in the exhaust gas recirculation system is detected, thereby achieving the purpose of reducing the difficulty of measuring the flow rate of the exhaust gas in the exhaust gas recirculation system, thereby solving the technical problem of the high limitation of the flow rate detection of the exhaust gas recirculation system, and further achieving the technical effect of reducing the limitation of the flow rate detection of the exhaust gas recirculation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0028] FIG. 1( a ) is a schematic diagram of an application scenario of a flow rate detection method for an exhaust gas recirculation system in a vehicle according to an embodiment of the present invention;

[0029] FIG1( b ) is a flow chart of a method for detecting flow of an exhaust gas recirculation system in a vehicle according to an embodiment of the present invention;

[0030] FIG2( a ) is a flow chart of an EGR flow detection and cleaning method based on an engine idling state according to an embodiment of the present invention;

[0031] FIG2( b ) is a schematic diagram of data interaction between a vehicle and a server according to an embodiment of the present invention;

[0032] FIG3( a ) is a structural block diagram of a flow detection system of an exhaust gas recirculation system in a vehicle according to an embodiment of the present invention;

[0033] FIG3( b ) is a structural block diagram of a flow detection device for an exhaust gas recirculation system in a vehicle according to an embodiment of the present invention;

[0034] Figure 4 is a structural block diagram of a vehicle according to an embodiment of the present invention. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0036] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0037] According to an embodiment of the present invention, a flow rate detection method of an exhaust gas recirculation system in a vehicle is provided.

[0038] As an optional embodiment, the flow detection method of the exhaust gas recirculation system in the vehicle can be applied to, but not limited to, the application scenario shown in FIG1(a). FIG1(a) is a schematic diagram of an application scenario of a flow detection method of an exhaust gas recirculation system in a vehicle according to an embodiment of the present invention. As shown in FIG1(a), in the application scenario, the mobile terminal 10 can communicate with the server 13 through the network 11, but not limited to, and the server 13 can perform operations on the database, such as writing data operations or reading data operations. The mobile terminal 10 can be a terminal device, and the terminal device can include, but not limited to, a human-computer interaction screen, a processor, and a memory. The human-computer interaction screen can be used to display a virtual machine on the mobile terminal 10, but not limited to. The vehicle 12 can be used to respond to the human-computer interaction operation, perform corresponding operations, or generate corresponding instructions, and send the generated instructions to the server 13. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be performed in a different order than here.

[0039] For example, the flow detection method of the exhaust gas recirculation system in the vehicle in the present application can be used to provide the exhaust gas flow detection function of the exhaust gas in the exhaust gas recirculation system for the preset application scenario. The above-mentioned preset application scenarios may include the following scenarios in the vehicle field: commuting automatic driving scenarios, artificial intelligence (AI) driving scenarios for family cars, automatic parking assistance (APA) scenarios (such as memory parking for owned parking spaces in garages, smart parking for designated parking spaces in parking lots, etc.) and smart navigation assistance (Navigation Guided Pilot, NGP for short) scenarios in urban areas or high-speed areas, etc. In addition, the above-mentioned preset application scenarios may also include, but are not limited to: intelligent transportation scenarios of smart driving trucks or unmanned trucks in the field of logistics and transportation, and intelligent farming scenarios of self-driving agricultural vehicles in the field of agricultural machinery, etc.

[0040] When the above-mentioned preset application scenarios are scenarios in fields other than the vehicle field, those skilled in the art should be able to understand that the vehicle in the above-mentioned method for detecting the flow rate of the exhaust gas recirculation system in the vehicle can be replaced with other objects (for example, agricultural machinery, drones, and robots, etc.), and correspondingly, the various devices and systems included in the vehicle can be replaced with devices and systems related to other objects. On this basis, in the embodiments of the present application, the vehicle field is taken as an example to exemplify the specific implementation of the method for detecting the flow rate of the exhaust gas recirculation system in the above-mentioned vehicle.

[0041] FIG1(b) is a flow chart of a method for detecting flow of an exhaust gas recirculation system in a vehicle according to an embodiment of the present invention. The vehicle includes an engine and an exhaust gas recirculation system. Exhaust gas discharged by the engine enters an intake passage of the exhaust gas recirculation system. As shown in FIG1(b), the method may include the following steps:

[0042] Step S112, controlling the engine to enter an idling state.

[0043] In the technical solution provided in the above step S112 of the present invention, the above vehicle may include an engine and an exhaust gas recirculation system.

[0044] In this embodiment, the exhaust gas discharged from the above engine can enter the intake duct of the exhaust gas recirculation (EGR) system. For example, part of the exhaust gas / all of the exhaust gas discharged from the above engine can enter the intake duct of the EGR system, which is only an example and not a specific limitation.

[0045] In this embodiment, the exhaust gas may also be referred to as tail gas, and the exhaust gas may include at least one of the following gases: water vapor, carbon dioxide (CO2), carbon monoxide (CO), nitrogen oxides (NO x ), particulate matter (PM) and volatile organic compounds (VOC s ) are only given as examples and are not specifically limited here.

[0046] In this embodiment, the engine is controlled to enter an idling state. Optionally, in this embodiment, when the vehicle is running in a deceleration fuel cut-off condition, the engine in the vehicle can be controlled to enter an idling state, that is, the engine in the vehicle can be controlled to enter a no-load and running state.

[0047] Step S114, when the engine is in an idling state, detecting the pressure information of the exhaust gas in the intake duct.

[0048] In the technical solution provided in the above step S114 of the present invention, the above pressure information can be used to indicate the pressure size and pressure state of the exhaust gas in the intake duct.

[0049] In this embodiment, the above pressure may be the absolute pressure value of the exhaust gas in the intake duct, which is only used as an example and is not specifically limited. The above pressure state of the exhaust gas can be used to indicate whether the pressure of the exhaust gas is in a stable state. And whether the flow of the exhaust gas is in a stable state is only used as an example and is not specifically limited.

[0050] In this embodiment, after controlling the engine to enter an idling state, the pressure information of the exhaust gas in the intake duct is detected when the engine is in an idling state. Optionally, this embodiment detects the pressure of the exhaust gas in the intake duct using a pressure detection device deployed in the intake duct on the basis of controlling the engine to enter an idling state, and the pressure information of the exhaust gas in the intake duct can be obtained, that is, the pressure of the exhaust gas in the intake duct can be obtained. Among them, the above-mentioned pressure detection device can include one of the following devices: an exhaust gas differential pressure gauge or a pressure sensor, etc., which is only used as an example here and is not specifically limited.

[0051] Step S116, determining the exhaust state of the engine during the process of exhausting the exhaust gas based on the pressure information.

[0052] In the technical solution provided in the above step S116 of the present invention, the above exhaust state can be used to indicate whether the engine discharges the exhaust gas at a stable speed during the process of discharging the exhaust gas.

[0053] In this embodiment, if the engine exhausts exhaust gas at a stable speed during the process of exhausting exhaust gas, the exhaust state of the engine during the process of exhausting exhaust gas is a stable exhaust state; if the engine exhausts exhaust gas at a changing speed during the process of exhausting exhaust gas, the exhaust state of the engine during the process of exhausting exhaust gas is a changing exhaust state.

[0054] In this embodiment, if the change value of the above speed during the exhaust gas discharge process is within the preset change range, it means that the speed is a stable speed; if the change value of the above speed during the exhaust gas discharge process is not within the preset change range, it means that the speed is a changing speed. The preset change range may be, but is not limited to, [0.1, 0.2], which is only used as an example here and is not specifically limited.

[0055] In this embodiment, after the pressure information of the exhaust gas in the intake duct is detected when the engine is in an idling state, the exhaust state of the engine in the process of exhausting the exhaust gas is determined based on the pressure information. Optionally, this embodiment compares the detected pressure information with the pressure information threshold on the basis of detecting the pressure information of the exhaust gas in the intake duct, and a comparison result can be obtained, wherein the comparison result can be that the pressure information is less than the first pressure information threshold in the pressure information threshold, or that the pressure information is greater than or equal to the first pressure information threshold in the pressure information threshold. According to the obtained comparison result and the pressure state of the exhaust gas represented by the pressure information, it can be determined whether the exhaust state of the engine in the process of exhausting the exhaust gas is a stable exhaust state or a changing exhaust state.

[0056] It should be noted that the above method for determining the exhaust state of the engine in the process of exhausting exhaust gas based on pressure information is only an example and is not specifically limited here. As long as the process and method can determine the exhaust state of the engine in the process of exhausting exhaust gas based on the pressure information of the exhaust gas in the intake duct, it is within the protection scope of the embodiments of the present application and will not be described one by one here.

[0057] Step S118, in response to the exhaust state being a stable exhaust state, detecting the flow rate of the exhaust gas in the exhaust gas recirculation system to obtain a flow rate detection result.

[0058] In the technical solution provided in the above step S118 of the present invention, the above flow detection result can be expressed in at least one of the following forms: text form and chart form, etc., which is only used as an example here and is not specifically limited.

[0059] In this embodiment, after determining the exhaust state of the engine in the process of exhausting exhaust gas based on pressure information, in response to the exhaust state being a stable exhaust state, the flow of exhaust gas in the exhaust gas recirculation system is detected to obtain a flow detection result. Optionally, this embodiment, on the basis of determining the exhaust state of the engine in the process of exhausting exhaust gas, judges whether the above-mentioned exhaust state is a stable exhaust state or a variable exhaust state, and obtains a judgment result, wherein the judgment result can be that the above-mentioned exhaust state is a stable exhaust state, or that the above-mentioned exhaust state is a variable exhaust state. If the judgment result obtained is that the above-mentioned exhaust state is a stable exhaust state, the flow detection result of the exhaust gas in the exhaust gas recirculation system is detected by using a flow detection device deployed in the intake duct. Among them, the flow detection device can be but not limited to a flow detector, which is only used as an example here and is not specifically limited.

[0060] Optionally, if the judgment result is that the above exhaust state is a variable exhaust state, wait until the engine enters the idling state next time, detect the pressure information of the exhaust gas in the intake duct, and determine the exhaust state of the engine in the process of exhausting the exhaust gas based on the detected pressure information. A judgment can be obtained by judging whether the exhaust state determined this time is a stable exhaust state or a variable exhaust state. If the judgment result is that the above exhaust state is a stable exhaust state, the flow rate of the exhaust gas in the exhaust gas recirculation system is detected by using the flow detection equipment deployed in the intake duct to obtain the flow detection result; if the judgment result is that the above exhaust state is a variable exhaust state, wait until the engine enters the idling state again, and repeat the above steps S114 to S118.

[0061] It should be noted that the flow detection method of the exhaust gas recirculation system in the vehicle in the present application can also be applied to at least the following scenarios: automatic driving scenario, assisted driving scenario and passive driving scenario (which can be referred to as human driving scenario). Among them, the automatic driving scenario can be used to indicate that the vehicle control system controls the driving of the vehicle during the driving process, and the driving object does not need to maintain control and supervision of the driving. The assisted driving scenario can be used to indicate that the vehicle control system provides assistance during the driving process, but the driving object still needs to maintain control and supervision of the driving. The passive driving scenario can be used to indicate the scenario where the driving object controls the vehicle to complete the driving operation.

[0062] In the artificial intelligence AI driving of autonomous vehicles, commuting mode usually refers to a driving mode designed for commuting or daily commuting. Among them, the AI ​​driving can collect data by learning the user's driving route and driving behavior. When all the learning is completed, the collected data is screened and checked, and then the full segment of data after screening and checking is automatically transmitted back to the cloud server to execute the construction of the cloud map. The next time you drive and choose the same route, the AI ​​driving will be activated, and the vehicle will be driven to the destination of the route according to the constructed cloud map. Among them, matching and complementing the offline map with the constructed cloud map can improve the accuracy of the map.

[0063] In the above steps S112 to S118 of the present application, when the flow rate of the exhaust gas recirculation system in the vehicle is detected, the engine can be controlled to enter an idling state. When the engine is in an idling state, the pressure information of the exhaust gas in the intake duct can be detected, and according to the detected pressure information of the exhaust gas in the intake duct, the exhaust state of the engine in the process of exhausting the exhaust gas can be determined, and in response to the exhaust state being a stable exhaust state, the flow rate of the exhaust gas in the exhaust gas recirculation system is detected, and a flow rate detection result can be obtained. Since in the embodiment of the present application, when the engine is controlled to enter an idling state, the pressure information of the exhaust gas in the intake duct can be detected, and according to the detected pressure information, the exhaust state of the engine in the process of exhausting the exhaust gas can be determined, if the determined exhaust state is a stable exhaust state, the flow rate of the exhaust gas in the exhaust gas recirculation system is detected, thereby achieving the purpose of reducing the difficulty of measuring the flow rate of the exhaust gas in the exhaust gas recirculation system, thereby solving the technical problem of the high limitation of the flow rate detection of the exhaust gas recirculation system, and further achieving the technical effect of reducing the limitation of the flow rate detection of the exhaust gas recirculation system.

[0064] The above method of this embodiment is further introduced below.

[0065] As an optional implementation method, step S116, based on the pressure information, determines the exhaust state of the engine in the process of exhausting exhaust gas, including: in response to the pressure information being less than the first pressure information threshold, the pressure information is in a stable state, and the airflow of the exhaust gas is in a stable state, determining that the exhaust state is a stable exhaust state.

[0066] In this embodiment, the first pressure information threshold can be used to limit the pressure of the exhaust gas in the intake duct. For example, the first pressure information threshold can be used to limit the absolute pressure value of the exhaust gas in the intake duct to a minimum pressure value, which is only used as an example and is not specifically limited.

[0067] In this embodiment, the above-mentioned stable state can be used to indicate that the pressure of the exhaust gas in the intake passage is stable.

[0068] In this embodiment, the above-mentioned stable state can be used to indicate that the flow of exhaust gas in the intake passage is stable.

[0069] In this embodiment, when the engine is in an idling state, after the pressure information of the exhaust gas in the intake duct is detected, in response to the pressure information being less than the first pressure information threshold, the pressure information is in a stable state, and the exhaust gas flow is in a stable state, the exhaust state is determined to be a stable exhaust state. Optionally, based on the detection of the pressure information of the exhaust gas in the intake duct, this embodiment can compare the detected pressure information with the first pressure information threshold to obtain a comparison result, and at the same time detect whether the pressure of the exhaust gas is in a stable state and whether the exhaust gas flow is in a stable state, and obtain a state detection result. If the comparison result obtained is that the pressure information of the exhaust gas in the intake duct is less than the first pressure information threshold, and the state detection result obtained is that the pressure information of the exhaust gas in the intake duct is in a stable state, and the exhaust gas flow is in a stable state, it can be determined that the exhaust state of the engine in the process of exhausting the exhaust gas is a stable exhaust state, thereby achieving the purpose of determining the exhaust state and realizing the technical effect of improving the flow detection efficiency of the exhaust gas.

[0070] The method of detecting the flow rate of exhaust gas in the exhaust gas recirculation system in response to the exhaust state being a stable exhaust state and obtaining the flow rate detection result of this embodiment is further described below.

[0071] As an optional implementation method, step S118, in response to the exhaust state being a stable exhaust state, the flow rate of exhaust gas in the exhaust gas recirculation system is detected to obtain a flow rate detection result, including: in response to the exhaust state being a stable exhaust state, controlling the valve body of the exhaust gas recirculation system to perform a self-inspection operation to obtain a self-inspection result; in response to the self-inspection result being that the valve body self-inspection has passed, the flow rate of exhaust gas in the exhaust gas recirculation system is detected to obtain a flow rate detection result.

[0072] In this embodiment, the valve body of the exhaust gas recirculation system may be connected to the intake passage.

[0073] In this embodiment, the self-checking operation may be a pressure checking operation performed on the valve body when the valve body is opened to a target opening.

[0074] In this embodiment, the self-test result can be used to indicate whether the valve body self-test has passed. For example, the self-test result can be that the valve body self-test has passed, or that the valve body self-test has not passed, which is only an example and not specifically limited.

[0075] In this embodiment, after determining the exhaust state of the engine in the process of exhausting exhaust gas based on pressure information, in response to the exhaust state being a stable exhaust state, the valve body of the exhaust gas recirculation system is controlled to perform a self-check operation to obtain a self-check result. Optionally, this embodiment, based on determining the exhaust state of the engine in the process of exhausting exhaust gas, determines whether the above-determined exhaust state is a stable exhaust state or a changing exhaust state, and obtains a judgment result. If the judgment result obtained is that the above-determined exhaust state is a stable exhaust state, the valve body of the exhaust gas recirculation system is controlled to perform a self-check operation to obtain a self-check result, thereby achieving the purpose of self-checking the valve body of the exhaust gas recirculation system and realizing the technical effect of improving the accuracy of self-checking the valve body of the exhaust gas recirculation system.

[0076] In this embodiment, in response to the exhaust state being a stable exhaust state, the valve body of the exhaust gas recirculation system is controlled to perform a self-test operation, and after obtaining the self-test result, in response to the self-test result being that the valve body self-test has passed, the flow of the exhaust gas in the exhaust gas recirculation system is detected to obtain a flow detection result. Optionally, on the basis of obtaining the self-test result, this embodiment parses the obtained self-test result, and if the obtained self-test result is that the valve body self-test has passed, the flow of the exhaust gas in the exhaust gas recirculation system is detected using a flow detection device deployed in the intake duct, and the flow detection result can be obtained, thereby achieving the purpose of being able to detect the flow of the exhaust gas, and realizing the technical effect of reducing the limitations of the flow detection of the exhaust gas recirculation system.

[0077] The method of controlling the valve body of the exhaust gas recirculation system to perform a self-check operation in response to the exhaust state being a stable exhaust state and obtaining a self-check result of this embodiment is further described below.

[0078] As an optional implementation method, in response to the exhaust state being a stable exhaust state, the valve body of the exhaust gas recirculation system is controlled to perform a self-inspection operation to obtain a self-inspection result, including: in response to the exhaust state being a stable exhaust state, the initial opening of the valve body is opened to a target opening; the pressure information difference between the pressure information corresponding to the target opening and the pressure information corresponding to the valve body when the valve body is closed is determined; in response to the pressure information difference being less than or equal to a second pressure information threshold, the valve body of the target opening is controlled to perform a self-inspection operation to obtain a self-inspection result.

[0079] In this embodiment, the target opening may be an opening that is set initially (also referred to as an initialization opening), or an opening that is obtained by adjusting the initialization opening according to the state of the vehicle. For example, the target opening may be, but is not limited to, 40%, which is only used as an example and is not specifically limited.

[0080] In this embodiment, the second pressure information threshold value can be used to determine whether a self-test operation needs to be performed on the valve body of the exhaust gas recirculation system. The second pressure information threshold value can also be called a calibration limit value, which is only used as an example and is not specifically limited.

[0081] In this embodiment, after determining the exhaust state of the engine in the process of exhausting exhaust gas based on pressure information, in response to the exhaust state being a stable exhaust state, the initial opening of the valve body is opened to the target opening. Optionally, this embodiment determines whether the exhaust state determined in the process of exhausting exhaust gas is a stable exhaust state or a variable exhaust state on the basis of determining the exhaust state of the engine in the process of exhausting exhaust gas, and a judgment result can be obtained. If the judgment result obtained is that the exhaust state is a stable exhaust state, the initial opening of the valve body is opened to the target opening, for example, the initial opening of the valve body of 10% is opened to the target opening of 40%, thereby achieving the purpose of adjusting the opening of the valve body and realizing the technical effect of improving the accuracy of self-inspection of the valve body of the exhaust gas recirculation system.

[0082] In this embodiment, in response to the exhaust state being a stable exhaust state, after the initial opening of the valve body is opened to the target opening, the pressure information difference between the pressure information corresponding to the target opening and the pressure information corresponding to the valve body when it is closed is determined. Optionally, on the basis of opening the initial opening of the valve body to the target opening, this embodiment detects the pressure information of the exhaust gas corresponding to the above target opening, and then calculates the pressure information difference between the pressure information of the exhaust gas corresponding to the above target opening and the pressure information of the exhaust gas corresponding to the valve body when it is closed, thereby achieving the purpose of determining the pressure information difference between the pressure information corresponding to different openings, and realizing the technical effect of improving the accuracy of self-checking the valve body of the exhaust gas recirculation system.

[0083] In this embodiment, after determining the pressure information difference between the pressure information corresponding to the target opening and the pressure information corresponding to the valve body when it is closed, in response to the pressure information difference being less than or equal to the second pressure information threshold, the valve body of the target opening is controlled to perform a self-check operation to obtain a self-check result. Optionally, on the basis of determining the pressure information difference between the pressure information corresponding to the target opening and the pressure information corresponding to the valve body when it is closed, this embodiment determines the relationship between the determined pressure information difference and the second pressure information threshold, and if it is determined that the pressure information difference is less than or equal to the second pressure information threshold, the valve body of the exhaust gas recirculation system is controlled to perform a self-check operation to obtain a self-check result, thereby achieving the purpose of being able to perform self-check on the valve body of the exhaust gas recirculation system and realizing the technical effect of improving the accuracy of the self-check on the valve body of the exhaust gas recirculation system.

[0084] The flow rate detection method of the exhaust gas recirculation system in the above-mentioned vehicle of this embodiment is further described below.

[0085] As an optional embodiment, the method further includes: in response to the pressure information difference being greater than a second pressure information threshold and the engine being in a stable exhaust state, using the exhausted exhaust gas to clean particulate matter in the valve body.

[0086] In this embodiment, the particulate matter in the valve body may include carbon deposits, sulfates, soluble organic matter, etc., which are only used as examples and are not specifically limited.

[0087] In this embodiment, in response to the pressure information difference being greater than the second pressure information threshold and the engine being in a stable exhaust state, the exhaust gas is used to clean the particulate matter in the valve body. Optionally, this embodiment determines the relationship between the pressure information difference determined between the pressure information corresponding to the target opening and the pressure information corresponding to the valve body when it is closed, and detects whether the exhaust state of the engine in the process of exhausting the exhaust gas is a stable exhaust state. If it is determined that the pressure information difference is greater than the second pressure information threshold and it is detected that the exhaust state of the engine in the process of exhausting the exhaust gas is a stable exhaust state, the exhaust gas is used to clean the particulate matter in the valve body, thereby achieving the purpose of improving the cleaning efficiency of impurities in the valve body and extending the service life of the engine, and realizing the technical effect of improving the accuracy of flow detection of the exhaust gas recirculation system.

[0088] The flow rate detection method of the exhaust gas recirculation system in the above-mentioned vehicle of this embodiment is further described below.

[0089] As an optional embodiment, in response to the pressure information difference being greater than a second pressure information threshold, clean gas is input into a pipeline of the exhaust gas recirculation system to clean particulate matter in the pipeline.

[0090] In this embodiment, the pipeline of the exhaust gas recirculation system may be connected to the intake passage of the exhaust gas recirculation system.

[0091] In this embodiment, the particulate matter in the above pipeline may include carbon deposits, sulfates, soluble organic matter, etc., which are only used as examples and are not specifically limited.

[0092] In this embodiment, the cleaning gas may be, but is not limited to, clean air, which is merely used as an example and is not specifically limited.

[0093] In this embodiment, in response to the pressure information difference being greater than the second pressure information threshold, clean gas is input into the pipeline of the exhaust gas recirculation system to clean the particulate matter in the pipeline. Optionally, this embodiment determines the relationship between the pressure information difference determined between the pressure information corresponding to the target opening and the pressure information corresponding to the valve body when it is closed, and if it is determined that the pressure information difference is greater than the second pressure information threshold, clean gas is input into the pipeline of the exhaust gas recirculation system, thereby using the input clean gas in the pipeline to clean the particulate matter in the pipeline, thereby achieving the purpose of preventing the accumulation of particulate matter in the exhaust gas in the EGR channel, achieving the technical effect of improving the cleaning efficiency of impurities in the channel, and extending the service life of the engine.

[0094] The method for controlling the engine to enter an idling state in this embodiment is further described below.

[0095] As an optional embodiment, controlling the engine to enter an idling state includes: controlling the vehicle to operate in a deceleration and fuel cut-off condition; and in the deceleration and fuel cut-off condition, using the inertia of the vehicle to drive the engine to enter an idling state.

[0096] In this embodiment, the vehicle is controlled to operate in a deceleration fuel cut-off condition. Optionally, this embodiment can switch the vehicle from the acceleration fuel supply condition to the deceleration fuel cut-off condition by lightly stepping on the vehicle's brake (for example, it can also be called a brake pedal), thereby controlling the vehicle to operate in the deceleration fuel cut-off condition to which it is switched, thereby achieving the purpose of controlling the vehicle's fuel injector to stop injecting fuel, and further achieving the technical effect of reducing the limitations of the flow detection of the exhaust gas recirculation system.

[0097] In this embodiment, after the vehicle is controlled to operate in the deceleration and fuel cut-off condition, the inertia of the vehicle is used to drive the engine to enter an idling state in the deceleration and fuel cut-off condition. Optionally, this embodiment can use the inertia of the vehicle to drive the engine to enter a no-load and running state on the basis of controlling the vehicle to operate in the deceleration and fuel cut-off condition, thereby achieving the purpose of ensuring stable exhaust of the engine, and further achieving the technical effect of reducing the limitations of flow detection of the exhaust gas recirculation system.

[0098] The method for controlling the vehicle to operate in a deceleration and fuel cut-off condition in this embodiment is further described below.

[0099] As an optional embodiment, controlling the vehicle to operate in a deceleration and fuel cut-off condition includes: in response to the engine speed being within a speed threshold range, the engine water temperature being greater than a temperature threshold, and the vehicle speed being greater than a speed threshold, determining that the vehicle is operating in a deceleration and fuel cut-off condition, wherein the number of times the vehicle operates in the deceleration and fuel cut-off condition is less than or equal to a number threshold.

[0100] In this embodiment, the number of times the vehicle operates in the deceleration fuel cut-off condition may be less than or equal to the number threshold, wherein the number threshold may be, but is not limited to, 6 times, which is only used as an example and is not specifically limited.

[0101] In this embodiment, the speed threshold range may be, but not limited to, the range of (1800, 4500), the temperature threshold may be, but not limited to, 70°C, and the vehicle speed threshold may be, but not limited to, 30km / h. For example, when the speed threshold range is (1800, 4500), the temperature threshold is 70°C, and the vehicle speed threshold is 30km / h, if the engine speed is within the range of (1800, 4500), the engine water temperature is greater than 70°C, and the vehicle speed is greater than 30km / h, it can be determined that the vehicle is operating in a deceleration fuel cut-off condition, which is only an example and is not specifically limited here.

[0102] In the target database, in response to the engine speed being within the speed threshold range, the engine water temperature being greater than the temperature threshold, and the vehicle speed being greater than the vehicle speed threshold, it is determined that the vehicle is operating in a deceleration fuel cut-off condition. Optionally, in the case of lightly stepping on the vehicle brake, this embodiment determines the relationship between the engine speed and the speed threshold range, the relationship between the engine water temperature and the temperature threshold, and the relationship between the vehicle speed and the vehicle speed threshold. If it is determined that the engine speed is within the speed threshold range, the engine water temperature is greater than the temperature threshold, and the vehicle speed is greater than the vehicle speed threshold, the vehicle can be switched from the acceleration fuel supply condition to the deceleration fuel cut-off condition, thereby controlling the vehicle to operate in the deceleration fuel cut-off condition to which it is switched, thereby achieving the purpose of controlling the vehicle's injector to stop injecting fuel, and further achieving the technical effect of reducing the limitations of flow detection of the exhaust gas recirculation system.

[0103] In an embodiment of the present invention, when the flow rate of the exhaust gas recirculation system in the vehicle is detected, the engine can be controlled to enter an idling state. When the engine is in an idling state, the pressure information of the exhaust gas in the intake duct can be detected, and according to the detected pressure information of the exhaust gas in the intake duct, the exhaust state of the engine in the process of exhausting the exhaust gas can be determined, and in response to the exhaust state being a stable exhaust state, the flow rate of the exhaust gas in the exhaust gas recirculation system is detected, and a flow rate detection result can be obtained. Since in the embodiment of the present application, when the engine is controlled to enter an idling state, the pressure information of the exhaust gas in the intake duct can be detected, and according to the detected pressure information, the exhaust state of the engine in the process of exhausting the exhaust gas can be determined, if the determined exhaust state is a stable exhaust state, the flow rate of the exhaust gas in the exhaust gas recirculation system is detected, thereby achieving the purpose of reducing the difficulty of measuring the flow rate of the exhaust gas in the exhaust gas recirculation system, thereby solving the technical problem of the high limitation of the flow rate detection of the exhaust gas recirculation system, and further achieving the technical effect of reducing the limitation of the flow rate detection of the exhaust gas recirculation system.

[0104] The technical solution of the embodiment of the present invention is illustrated below in conjunction with preferred implementation modes.

[0105] At present, in the exhaust gas recirculation system of the vehicle, a pressure sensor is often used to detect the absolute pressure value of the exhaust gas in the intake duct, and a temperature sensor is also used to detect the temperature value of the exhaust gas in the intake duct, thereby calculating the flow rate of the exhaust gas in the exhaust gas recirculation system.

[0106] In addition to the above calculation method, a flow meter can also be used to directly measure the flow of exhaust gas in the exhaust gas recirculation system. However, in actual operation, such a direct measurement method is difficult to implement, resulting in a technical problem that the flow detection of the exhaust gas recirculation system is highly limited.

[0107] However, an embodiment of the present invention proposes a flow detection method for an exhaust gas recirculation system in a vehicle. When the vehicle's engine enters an idling state, it only needs to detect pressure information, and utilizes stable exhaust gas to perform flow detection on the exhaust gas recirculation system, thereby achieving the purpose of reducing the difficulty of measuring the flow of exhaust gas in the exhaust gas recirculation system, thereby solving the technical problem of the high limitations of flow detection of the exhaust gas recirculation system, and further achieving the technical effect of reducing the limitations of flow detection of the exhaust gas recirculation system.

[0108] In this embodiment, by using the EGR flow detection and cleaning method based on the engine idling state, the flow of exhaust gas in the exhaust gas recirculation system can be detected by using stable exhaust gas, and the particulate matter and carbon deposits in the intake duct can be cleaned. For example, Figure 2 (a) is a flow chart of an EGR flow detection and cleaning method based on the engine idling state according to an embodiment of the present invention. As shown in Figure 2 (a), the method may include the following steps:

[0109] Step S202, determining whether the vehicle enters a deceleration fuel cut-off condition.

[0110] In the technical solution provided in the above step S202 of the present invention, when the vehicle decelerates and cuts off the fuel, due to the throttle valve being closed, the engine management system (EMS) can control the injector to stop injecting fuel, and use the inertia of the vehicle to drive the engine into an idling state. At this time, the absolute pressure value of the exhaust gas in the intake duct of the EGR system is the lowest, the pressure of the exhaust gas is stable, and the airflow of the exhaust gas is stable. Therefore, the flow rate of the exhaust gas in the exhaust gas recirculation system can be detected by using stable exhaust gas to obtain a flow detection result.

[0111] It should be noted that if the following conditions are met, it is determined that the vehicle enters the deceleration fuel cut-off condition, wherein the following values ​​are only used as examples and are not specifically limited:

[0112] Condition 1: The engine speed is within the range of (1800, 4500);

[0113] Condition 2: The engine water temperature is > 70°C;

[0114] Condition 3: Vehicle speed > 30km / h;

[0115] Condition 4: The number of deceleration oil cut-offs in the current cycle is ≤ 6 times;

[0116] Condition 5: The duration of conditions 1 to 4 exceeds 1S.

[0117] If the vehicle does not enter the deceleration fuel cut-off condition, all processes are terminated. If the vehicle enters the deceleration fuel cut-off condition, the process proceeds to step S204 and step S206, and when the valve body is opened from the initial opening to the target opening, the valve body is self-checked, and it is determined whether the pressure information difference between the pressure information corresponding to the target opening and the pressure information corresponding to the valve body when it is closed is greater than the calibration limit.

[0118] In the technical solution provided in the above step S204 of the present invention, when the vehicle enters the deceleration and fuel cut-off condition, since the absolute pressure value of the exhaust gas in the intake duct of the EGR system is the lowest at this time, the pressure of the exhaust gas is stable, and the airflow of the exhaust gas is smooth, the valve body can be initially self-checked when the valve body is opened to a specific opening, thereby achieving the purpose of real-time monitoring of the EGR flow.

[0119] If the pressure information difference is less than or equal to the second pressure information threshold, the process proceeds to step S208, the valve body of the target opening is controlled to perform a self-test operation to obtain a self-test result, and in response to the self-test result that the valve body self-test passes, the flow rate of the exhaust gas in the exhaust gas recirculation system is detected to obtain a flow rate detection result. If the pressure information difference is greater than the second pressure information threshold, the process proceeds to step S210, the carbon deposits in the valve body are cleaned using the exhausted exhaust gas, and the particulate matter in the pipeline is cleaned using clean air.

[0120] In the technical solution provided in the above step S210 of the present invention, in order to prevent the particulate matter in the exhaust gas from accumulating in the EGR channel, the strategy controls the input of clean air into the pipeline of the EGR system without affecting the driving performance, so as to clean the particulate matter in the pipeline of the EGR system, thereby achieving the purpose of preventing the particulate matter in the exhaust gas from accumulating in the EGR channel, realizing the technical effect of improving the cleaning efficiency of impurities in the channel and extending the service life of the engine.

[0121] In this embodiment, since the throttle valve is closed, the EMS can control the injector to stop spraying fuel, and use the inertia of the vehicle to drive the engine into an idling state. At this time, the absolute pressure value of the exhaust gas in the intake duct of the EGR system is the lowest, the pressure of the exhaust gas is stable, and the airflow of the exhaust gas is smooth. Therefore, the exhaust gas discharged by the engine can be used to clean the carbon deposits in the valve body, thereby achieving the purpose of improving the cleaning efficiency of impurities in the valve body and extending the service life of the engine, and realizing the technical effect of improving the accuracy of flow detection of the exhaust gas recirculation system.

[0122] In this embodiment, the vehicle can upload the flow detection result obtained by the detection to the server, so that the server can adjust the pressure information threshold according to the received flow detection result, and send the adjusted pressure information threshold to the vehicle. For example, FIG2(b) is a schematic diagram of data interaction between a vehicle and a server according to an embodiment of the present invention. As shown in FIG2(b), the server 221 can adjust the pressure information threshold according to the flow detection result of the vehicle 220, and send the adjusted pressure information threshold to the vehicle 220.

[0123] In this embodiment, through the EGR flow detection and cleaning method based on the engine idling state, the flow of exhaust gas in the exhaust gas recirculation system can be detected by using stable exhaust gas, and the particulate matter and carbon deposits in the intake duct can be cleaned, thereby achieving the purpose of reducing the difficulty of measuring the flow of exhaust gas in the exhaust gas recirculation system, thereby solving the technical problem of the high limitations of flow detection of the exhaust gas recirculation system, and further achieving the technical effect of reducing the limitations of flow detection of the exhaust gas recirculation system.

[0124] According to another aspect of an embodiment of the present invention, corresponding to the embodiment of the flow detection method of the exhaust gas recirculation system in the above-mentioned vehicle, the present specification also provides a flow detection system of the exhaust gas recirculation system in the vehicle. Figure 3(a) is a structural block diagram of the flow detection system of the exhaust gas recirculation system in the vehicle according to an embodiment of the present invention. As shown in Figure 3(a), the flow detection system 300 of the exhaust gas recirculation system in the vehicle may include: a controller 302, a pressure sensor 304 and a flow detector 306.

[0125] The controller 302 is used to control the engine in the vehicle to enter an idling state, wherein the exhaust gas discharged by the engine enters the intake passage of the exhaust gas recirculation system in the vehicle.

[0126] The pressure sensor 304 is used to detect the pressure information of the exhaust gas in the intake duct when the engine is in an idling state.

[0127] The flow detector 306 is used to determine the exhaust state of the engine during the exhaust gas discharge process based on the pressure information, and in response to the exhaust state being a stable exhaust state, detect the flow of exhaust gas in the exhaust gas recirculation system to obtain a flow detection result.

[0128] In the technical solution provided by the flow detection system 300 of the exhaust gas recirculation system in the above-mentioned vehicle of the present invention, the above-mentioned controller 302 can be deployed in the EMS of the vehicle, the above-mentioned pressure sensor 304 can be deployed in the pressure detection equipment of the vehicle, and the pressure detection equipment can be deployed in the intake duct of the EGR system. The pressure detection equipment can also be an exhaust gas differential pressure meter, etc. The above-mentioned flow detector 306 can be deployed in the intake duct of the EGR system. This is only used as an example here without specific limitation.

[0129] According to another aspect of an embodiment of the present invention, corresponding to the embodiment of the flow detection method of the exhaust gas recirculation system in the above-mentioned vehicle, the present specification also provides a flow detection device of the exhaust gas recirculation system in the vehicle. FIG3(b) is a structural block diagram of a flow detection device of the exhaust gas recirculation system in the vehicle according to an embodiment of the present invention. As shown in FIG3(b), the flow detection device 310 of the exhaust gas recirculation system in the vehicle may include: a control unit 312, a first detection unit 314, a determination unit 316 and a second detection unit 318.

[0130] The control unit 312 is used to control the engine to enter an idling state.

[0131] The first detection unit 314 is used to detect the pressure information of the exhaust gas in the intake passage when the engine is in an idling state.

[0132] The determination unit 316 is used to determine the exhaust state of the engine during the process of exhausting the exhaust gas based on the pressure information.

[0133] The second detection unit 318 is used for detecting the flow rate of the exhaust gas in the exhaust gas recirculation system in response to the exhaust state being a stable exhaust state, and obtaining a flow rate detection result.

[0134] Optionally, the determination unit 316 includes: a determination module for determining that the exhaust state is a stable exhaust state in response to the pressure information being less than a first pressure information threshold, the pressure information being in a stable state, and the exhaust gas flow being in a steady state.

[0135] Optionally, the second detection unit 318 may include: a self-test module, used to control the valve body of the exhaust gas recirculation system to perform a self-test operation in response to the exhaust state being a stable exhaust state, and obtain a self-test result, wherein the valve body is connected to the intake duct; a detection module, used to detect the flow of exhaust gas in the exhaust gas recirculation system in response to the self-test result being that the valve body self-test passed, and obtain a flow detection result.

[0136] Optionally, the self-test module may include: an opening submodule, used to open the initial opening of the valve body to a target opening in response to the exhaust state being a stable exhaust state; a determination submodule, used to determine the pressure information difference between the pressure information corresponding to the target opening and the pressure information corresponding to the valve body in a closed state; a self-test submodule, used to control the valve body with a target opening to perform a self-test operation in response to the pressure information difference being less than or equal to a second pressure information threshold, and obtain a self-test result.

[0137] Optionally, the flow detection device 310 of the exhaust gas recirculation system in the vehicle may also include: a first cleaning unit for cleaning particulate matter in the valve body using the exhausted exhaust gas in response to the pressure information difference being greater than the second pressure information threshold and the engine being in a stable exhaust state.

[0138] Optionally, the flow detection device 310 of the exhaust gas recirculation system in the vehicle may also include: a second cleaning unit, for inputting clean gas into the pipeline of the exhaust gas recirculation system in response to the pressure information difference being greater than a second pressure information threshold, so as to clean the particulate matter in the pipeline, wherein the pipeline is connected to the intake duct.

[0139] Optionally, the control unit 312 includes: a control module for controlling the vehicle to operate in a deceleration and fuel cut-off condition; and a driving module for driving the engine into an idling state by utilizing the inertia of the vehicle under the deceleration and fuel cut-off condition.

[0140] Optionally, the control module may include: a determination submodule for determining that the vehicle is operating in a deceleration and fuel cut-off condition in response to the engine speed being within a speed threshold range, the engine water temperature being greater than a temperature threshold, and the vehicle speed being greater than a speed threshold, wherein the number of times the vehicle operates in the deceleration and fuel cut-off condition is less than or equal to a number threshold.

[0141] In this embodiment, the following units are provided in the flow detection device of the exhaust gas recirculation system in the vehicle: a control unit for controlling the engine to enter an idling state; a first detection unit for detecting the pressure information of the exhaust gas in the intake duct when the engine is in an idling state; a determination unit for determining the exhaust state of the engine in the process of discharging the exhaust gas based on the pressure information; a second detection unit for detecting the flow of the exhaust gas in the exhaust gas recirculation system in response to the exhaust state being a stable exhaust state, and obtaining a flow detection result, thereby achieving the purpose of reducing the difficulty of measuring the flow of the exhaust gas in the exhaust gas recirculation system, thereby solving the technical problem of the high limitation of the flow detection of the exhaust gas recirculation system, and further achieving the technical effect of reducing the limitation of the flow detection of the exhaust gas recirculation system.

[0142] According to another aspect of an embodiment of the present invention, a computer-readable storage medium is provided, the computer-readable storage medium including a stored executable program, wherein when the executable program runs, the device where the storage medium is located is controlled to execute any one of the above methods.

[0143] According to another aspect of an embodiment of the present invention, a computer program product is provided. The computer program product includes a computer program. When the computer program is executed by a processor, any one of the above methods is implemented.

[0144] According to another aspect of an embodiment of the present invention, a vehicle is provided, including: a memory storing an executable program; and a processor running the program, wherein the program executes any one of the above methods when running.

[0145] Figure 4is a structural block diagram of a vehicle according to an embodiment of the present invention. Figure 4 As shown, the components of the vehicle 400 include but are not limited to a memory 410 and a processor 420. The processor 420 is connected to the memory 410 via a bus 430, and the database 450 is used to store data.

[0146] The vehicle 400 may also include an access device 440 that enables the vehicle 400 to communicate via one or more networks 460. Examples of these networks include a Public Switched Telephone Network (PSTN), a Local Area Network (LAN), a Wide Area Network (WAN), a Personal Area Network (PAN), or a combination of communication networks such as the Internet. The access device 440 may include one or more of any type of network interface (e.g., a network interface controller (NIC)) of wired or wireless, such as an IEEE 802.11 wireless local area network (WLAN) wireless interface, a Worldwide Interoperability for Microwave Access (Wi-MAX) interface, an Ethernet interface, a Universal Serial Bus (USB) interface, a cellular network interface, a Bluetooth interface, a Near Field Communication (NFC) interface, and the like.

[0147] In one embodiment of the present disclosure, the above components of the vehicle 400 and Figure 4 Other components not shown in the figure may also be connected to each other, for example, via a bus. It should be understood that Figure 4 The vehicle structure block diagram shown is only for the purpose of illustration, and is not intended to limit the scope of the present disclosure. Those skilled in the art may add or replace other components as needed.

[0148] It should be noted that the serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0149] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0150] In the several embodiments provided by the present invention, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic, for example, the division of units can be a logical function division, and there can be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point, the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0151] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed over multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0152] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0153] If the integrated unit is implemented in the form of 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 the present invention, 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, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, referred to as Read-Only Memory), random access memory (RAM, referred to as Random Access Memory), mobile hard disk, magnetic disk or optical disk, etc., which can store program code.

[0154] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for detecting flow rate of an exhaust gas recirculation system in a vehicle, characterized in that: The vehicle comprises an engine and an exhaust gas recirculation system, the exhaust gas discharged by the engine enters an intake passage of the exhaust gas recirculation system, and the method comprises: Controlling the engine to enter an idling state; When the engine is in the idling state, detecting pressure information of the exhaust gas in the intake passage; Based on the pressure information, determining an exhaust state of the engine in a process of exhausting the exhaust gas; In response to the exhaust state being a stable exhaust state, the flow rate of the exhaust gas in the exhaust gas recirculation system is detected to obtain a flow rate detection result.

2. The method according to claim 1, characterized in that Determining, based on the pressure information, an exhaust state of the engine in a process of exhausting the exhaust gas, including: In response to the pressure information being less than a first pressure information threshold, the pressure information is in a stable state, and the flow of the exhaust gas is in a steady state, the exhaust state is determined to be the stable exhaust state.

3. The method according to claim 1, characterized in that In response to the exhaust state being a stable exhaust state, detecting the flow of the exhaust gas in the exhaust gas recirculation system to obtain a flow detection result, including: In response to the exhaust state being the stable exhaust state, controlling the valve body of the exhaust gas recirculation system to perform a self-check operation to obtain a self-check result, wherein the valve body is connected to the intake passage; In response to the self-inspection result being that the valve body has passed the self-inspection, the flow rate of the exhaust gas in the exhaust gas recirculation system is detected to obtain the flow rate detection result.

4. The method according to claim 3, characterized in that In response to the exhaust state being a stable exhaust state, Controlling the valve body of the exhaust gas recirculation system to perform a self-check operation and obtain a self-check result, including: In response to the exhaust state being the stable exhaust state, opening the initial opening of the valve body to a target opening; Determine a pressure information difference between the pressure information corresponding to the target opening and the pressure information corresponding to the valve body in a closed state; In response to the pressure information difference being less than or equal to a second pressure information threshold, the valve body with the target opening is controlled to perform a self-check operation to obtain the self-check result.

5. The method according to claim 4, characterized in that The method further comprises: In response to the pressure information difference being greater than the second pressure information threshold and the engine being in the stable exhaust state, the exhaust gas is used to clean particulate matter in the valve body.

6. The method according to claim 4, characterized in that The method further comprises: In response to the pressure information difference being greater than the second pressure information threshold, clean gas is input into a pipeline of the exhaust gas recirculation system to clean particulate matter in the pipeline, wherein the pipeline is connected to the intake passage.

7. The method according to claim 1, characterized in that Controlling the engine to enter an idling state comprises: Controlling the vehicle to operate in a deceleration and fuel cut-off condition; Under the deceleration and fuel cut-off condition, the inertia of the vehicle is used to drive the engine to enter the idling state.

8. The method according to claim 7, characterized in that Controlling the vehicle to operate in a deceleration and fuel cut-off condition includes: In response to the engine speed being within a speed threshold range, the engine water temperature being greater than a temperature threshold, and the vehicle speed being greater than a vehicle speed threshold, it is determined that the vehicle is operating in the deceleration and fuel cut-off condition, wherein the number of times the vehicle operates in the deceleration and fuel cut-off condition is less than or equal to a number threshold.

9. A flow detection system for an exhaust gas recirculation system in a vehicle, characterized in that: include: A controller, for controlling an engine in a vehicle to enter an idling state, wherein exhaust gas discharged from the engine enters an intake passage of an exhaust gas recirculation system in the vehicle; A pressure sensor, used for detecting pressure information of the exhaust gas in the intake duct when the engine is in the idling state; A flow detector is used to determine the exhaust state of the engine in the process of discharging the exhaust gas based on the pressure information, and in response to the exhaust state being a stable exhaust state, detect the flow of the exhaust gas in the exhaust gas recirculation system to obtain a flow detection result.

10. A flow detection device for an exhaust gas recirculation system in a vehicle, characterized in that: The vehicle comprises an engine and an exhaust gas recirculation system, the exhaust gas discharged by the engine enters an intake passage of the exhaust gas recirculation system, and the device comprises: A control unit, used for controlling the engine to enter an idling state; A first detection unit, used for detecting pressure information of the exhaust gas in the intake duct when the engine is in the idling state; a determination unit, configured to determine, based on the pressure information, an exhaust state of the engine in a process of exhausting the exhaust gas; The second detection unit is used for detecting the flow rate of the exhaust gas in the exhaust gas recirculation system in response to the exhaust state being a stable exhaust state, and obtaining a flow rate detection result.

11. A vehicle, characterized in that: include: A memory storing an executable program; A processor, configured to run the program, wherein the program executes the method according to any one of claims 1 to 8 when running.

12. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored executable program, wherein when the executable program is executed, the device where the storage medium is located is controlled to execute the method according to any one of claims 1 to 8.

13. A computer program product, characterized in that The invention comprises a computer program which, when executed by a processor, implements the method according to any one of claims 1 to 8.

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