Method for testing performance of engine exhaust gas recirculation system and related device

Abstract

The embodiment of the application discloses a kind of performance detection method and related device of engine exhaust gas recirculation system, the control method provided in the application first controls the exhaust gas circulation valve inlet temperature and exhaust temperature under different working conditions of engine, and further the maximum of inlet temperature and the maximum of exhaust temperature corresponding working condition is as target working condition, control engine works under target working condition, then control engine stops, detect the temperature of engine exhaust gas recirculation system, i.e. The highest temperature that can be reached in the engine shutdown heat recovery process is known, which can provide support and verification for EGR system layout and design, and can evaluate the shutdown heat recovery risk of the exhaust gas circulation valve under the most severe working condition, to avoid causing engine failure.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to a performance testing method for an engine exhaust gas recirculation system, a performance testing system for an engine exhaust gas recirculation system, a computer-readable storage medium, and a control device. Background Technology

[0002] Exhaust gas recirculation (EGR) technology refers to the process of returning a portion of the exhaust gases from the engine to the intake system, where they are mixed with fresh air and re-enter the cylinders for combustion. Because exhaust gases contain a large amount of polyatomic gases such as CO2, which are not combustible but absorb a significant amount of heat due to their high specific heat capacity, the maximum combustion temperature of the air-fuel mixture in the cylinder is lowered. Simultaneously, the introduction of exhaust gases into the cylinder reduces the oxygen concentration, thereby significantly reducing NO₂ levels. x The introduction of EGR under low-load engine conditions reduces intake pumping losses and fuel consumption. Simultaneously, the lower maximum combustion temperature significantly reduces engine knocking tendency, helps increase the engine compression ratio, and facilitates ignition advance, further improving fuel economy. With increasingly stringent fuel consumption and emission regulations, traditional vehicles need to continuously improve engine combustion thermal efficiency to maintain market competitiveness. Against this backdrop, newly developed high-thermal-efficiency engines almost universally incorporate EGR technology as a standard feature.

[0003] As a crucial electrical component of the EGR system, ensuring the ambient temperature meets its temperature resistance rating is essential for the proper functioning of the EGR system. Measuring the highest temperature reached at various measuring points on the EGR valve during the shutdown and reheat process after the engine is rapidly shut down from its highest exhaust temperature within the EGR operating range is crucial for assessing the risk of shutdown reheating under extreme conditions and preventing engine failure. However, currently, there are no publicly available testing and evaluation methods for EGR system shutdown reheating to verify the operational risks of the design. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0005] Therefore, a first aspect of the present invention provides a method for testing the performance of an engine exhaust gas recirculation system.

[0006] A second aspect of the present invention provides a performance testing system for an engine exhaust gas recirculation system.

[0007] A third aspect of the present invention provides a computer-readable storage medium.

[0008] A fourth aspect of the present invention provides a control device.

[0009] In view of this, a performance testing method for an engine exhaust gas recirculation system is proposed according to a first aspect of the embodiments of this application, comprising: Obtain the inlet temperature and exhaust temperature of the exhaust gas recirculation valve in the engine exhaust gas recirculation system under different engine operating conditions; Among different operating conditions, the operating condition corresponding to the maximum inlet temperature and the maximum exhaust temperature is taken as the target operating condition. The engine is controlled to operate under target conditions, and after the first operating time has elapsed, the engine is controlled to stop, and the temperature information of the engine exhaust gas recirculation system is collected. Based on the temperature information, the regenerative performance of the engine exhaust gas recirculation system is determined.

[0010] In one feasible implementation, different engine operating conditions refer to at least one of the engine's speed, load, and torque being different.

[0011] In one feasible implementation, the value of the first duration is determined based on the time required for the outlet water temperature and exhaust temperature of the engine exhaust gas recirculation system to transition from a fluctuating state to a stable state under the target operating conditions.

[0012] In one feasible implementation, the performance testing method for an engine exhaust gas recirculation system further includes: Obtain information on the highest temperature that the engine can reach under target operating conditions; The temperature of the cooling water in the engine exhaust gas recirculation system is maintained at the maximum temperature.

[0013] In one feasible implementation, the step of determining the regenerative performance of the engine exhaust gas recirculation system based on the temperature information includes: Temperature information corresponding to multiple locations within the exhaust gas recirculation valve of the engine exhaust gas recirculation system is detected and acquired. If any one of the temperature values ​​corresponding to the multiple location points exceeds the design temperature, it is determined that the heat recovery performance of the engine exhaust gas recirculation system is at risk.

[0014] In one feasible implementation, if it is determined that the regenerative performance of the engine exhaust gas recirculation system is at risk, the method further includes: Based on temperature information corresponding to multiple location points, the layout of the exhaust gas recirculation valve is redesigned; and / or Based on the temperature information corresponding to the multiple location points, the location points that exceed the design temperature are determined to be the installation positions of the heat insulation cover. The heat insulation cover is installed in the exhaust gas recirculation valve based on the installation location of the heat insulation cover.

[0015] According to a second aspect of the embodiments of this application, a performance testing system for an engine exhaust gas recirculation system is provided, which is applied to the performance testing method described in any of the above-mentioned technical solutions. The performance testing system includes: The operating condition verification component is installed at the intake pipe, cooler, and outlet pipe of the engine exhaust gas recirculation system to obtain the exhaust gas recirculation intake pressure, exhaust gas recirculation intake temperature, recirculation valve exhaust temperature, recirculation valve exhaust pressure, cooler outlet water temperature, recirculation valve outlet water temperature, and coolant flow rate. The target operating condition is determined based on at least one of the following: exhaust gas recirculation inlet pressure, exhaust gas recirculation inlet temperature, recirculation valve exhaust temperature, recirculation valve exhaust pressure, cooler outlet water temperature, recirculation valve outlet water temperature, and coolant flow rate. Multiple temperature detection components are installed inside the exhaust gas recirculation valve.

[0016] In one feasible implementation, the operating condition verification component includes: A first temperature sensor and a first pressure sensor are located at the air intake pipe; A second temperature sensor, a second pressure sensor, and a third temperature sensor are provided. The second temperature sensor is located at the exhaust port of the circulation valve, and the second pressure sensor and the third temperature sensor are located on the cooler. The fourth temperature sensor is located at the outlet of the circulation valve; A flow meter is installed at the outlet of the circulation valve.

[0017] According to a third aspect of the embodiments of this application, a computer-readable storage medium is provided, the computer-readable storage medium storing a computer program that implements the performance testing method as described in any of the above technical solutions.

[0018] A control device is provided according to a fourth aspect of the embodiments of this application, comprising: Memory, which stores computer programs; The processor executes the computer program; Wherein, when the processor executes the computer program, it implements any of the performance detection methods described above.

[0019] Compared with the prior art, the present invention has at least the following beneficial effects: The control method provided in this application first controls the inlet temperature and exhaust temperature of the exhaust gas recirculation valve of the engine under different operating conditions, and further takes the operating condition corresponding to the maximum inlet temperature and the maximum exhaust temperature as the target operating condition, controls the engine to work under the target operating condition, and then controls the engine to stop. By detecting the temperature of the engine exhaust gas recirculation system, the highest temperature that the engine can reach during the shutdown and reheating process can be known. This can provide support and verification for the layout and design of the EGR system, and can assess the risk of shutdown and reheating under the worst operating conditions of the exhaust gas recirculation valve, thus avoiding engine failure. Attached Figure Description

[0020] 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 the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A schematic flowchart illustrating the steps of a performance testing method for an engine exhaust gas recirculation system according to an embodiment of this application; Figure 2 A schematic structural diagram of the performance testing system of an engine exhaust gas recirculation system according to an embodiment of this application, showing its usage status from one angle. Figure 3 A schematic structural diagram of the performance testing system of an engine exhaust gas recirculation system according to an embodiment of this application, from another perspective of its usage status; Figure 4 A structural block diagram of a computer-readable storage medium according to an embodiment of this application; Figure 5 This is a structural block diagram of a control device according to an embodiment of this application.

[0021] in, Figure 2 and Figure 3 The correspondence between the reference numerals and component names in the attached drawings is as follows: 110 intake pipe, 120 cooler, 130 exhaust gas recirculation valve, 140 water outlet pipe; 111 First temperature sensor, 112 First pressure sensor, 121 Second temperature sensor, 122 Second pressure sensor, 123 Third temperature sensor, 131 Temperature detection component, 141 Fourth temperature sensor, 142 Flow meter. Detailed Implementation

[0022] To better understand the above technical solutions, the technical solutions of the embodiments of this application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this application and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this application, rather than limitations on the technical solutions of this application. In the absence of conflict, the embodiments of this application and the technical features in the embodiments can be combined with each other.

[0023] like Figure 1 As shown, a performance testing method for an engine exhaust gas recirculation system is proposed according to a first aspect of the embodiments of this application, comprising: Step 101: Obtain the inlet temperature and exhaust temperature of the exhaust gas recirculation (EGR) valve in the engine's exhaust gas recirculation (EGR) system under different engine operating conditions. It's understandable that during vehicle design, the engine model is usually fixed. By controlling the engine to operate under different conditions, it's possible to understand the inlet and exhaust temperatures of the EGR valve in the engine's EGR system under different operating states. Higher inlet and exhaust temperatures result in higher heat regeneration energy at shutdown of the EGR valve, making it easier for the EGR valve temperature to exceed the allowable temperature. It's also understandable that in the early stages of vehicle design, if the engine model is not yet determined, obtaining the inlet and exhaust temperatures of the EGR valve for different engines under different operating conditions is beneficial.

[0024] Step 102: Among different operating conditions, the operating condition corresponding to the maximum inlet temperature and the maximum exhaust temperature is taken as the target operating condition. It can be understood that the target operating condition is the worst operating condition in which the engine exhaust gas recirculation system is in when the engine is operating, under which the probability of the exhaust gas recirculation valve temperature exceeding the allowable temperature is the highest.

[0025] Step 103: Control the engine to operate under the target conditions, and after the first operating time has elapsed, control the engine to shut down and collect the temperature information of the engine exhaust gas recirculation system. It can be understood that by controlling the engine to operate under the target conditions, after the first operating time has elapsed, the engine exhaust gas recirculation system will enter a temperature stable state. Shutting down the engine in this situation simulates the rapid shutdown of the vehicle. Collecting the temperature information of the engine exhaust gas recirculation system in this condition allows for analysis of the shutdown and reheating state of the engine exhaust gas recirculation system.

[0026] Step 104: Determine the regenerative performance of the engine exhaust gas recirculation system based on temperature information.

[0027] The control method provided in this application first controls the inlet temperature and exhaust temperature of the exhaust gas recirculation valve under different operating conditions of the engine. Then, it takes the operating condition corresponding to the maximum inlet temperature and the maximum exhaust temperature as the target operating condition, controls the engine to work under the target operating condition, and then controls the engine to stop. By detecting the temperature of the engine exhaust gas recirculation system, the highest temperature that the engine can reach during the shutdown and reheat process can be known. This method can provide support and verification for the layout and design of the EGR system, assess the risk of shutdown and reheat under the worst operating conditions of the exhaust gas recirculation valve, and avoid engine failure.

[0028] In some examples, different engine operating conditions refer to at least one of the engine's speed, load, and torque being different.

[0029] This technical solution further clarifies the control methods for the engine under different operating conditions. The different operating conditions of the engine can be simulated by varying the engine speed, load, and torque. Then, the operating condition corresponding to the maximum inlet temperature and the maximum exhaust temperature under different operating conditions is taken as the target operating condition, which can identify the worst operating condition of the engine exhaust gas recirculation system during engine operation.

[0030] In one feasible implementation, the value of the first duration is determined based on the time required for the outlet water temperature and exhaust temperature of the engine exhaust gas recirculation system to transition from a fluctuating state to a stable state under the target operating conditions.

[0031] In this technical solution, during the initial stage of engine operation under target conditions, the outlet water temperature and exhaust temperature of the engine exhaust gas recirculation system will fluctuate. If the engine is shut down under these conditions, the inlet temperature and exhaust temperature of the exhaust gas recirculation valve will be inaccurately collected. However, after the engine is maintained under target conditions for a first period of time, the inlet temperature and exhaust temperature of the exhaust gas recirculation valve will approach equilibrium. Therefore, determining the first period based on the time required for the outlet water temperature and exhaust temperature of the engine exhaust gas recirculation system to transition from a fluctuating state to a stable state can make the collection of the inlet temperature and exhaust temperature of the exhaust gas recirculation valve more accurate.

[0032] In one feasible implementation, the performance testing method for the engine exhaust gas recirculation system further includes: acquiring information on the highest temperature that the cooling water can reach under target operating conditions; and controlling the cooling water temperature of the engine exhaust gas recirculation system to maintain at the highest temperature.

[0033] In this technical solution, considering that the cooling water can cool the exhaust gas recirculation valve, the cooling water temperature directly affects the exhaust gas recirculation valve inlet temperature and exhaust temperature after the engine is shut down. This solution obtains the highest temperature the cooling water can reach under target operating conditions; it controls the cooling water temperature of the engine's exhaust gas recirculation system to maintain this maximum temperature. In this state, the cooling effect of the cooling water on the exhaust gas recirculation valve is weakest. Based on this, the impact of the cooling water on the temperature information of the engine's exhaust gas recirculation system after shutdown can be minimized, allowing for a more accurate determination of the engine's exhaust gas recirculation system's regenerative performance.

[0034] In one feasible implementation, the step of determining the regenerative performance of the engine exhaust gas recirculation system based on temperature information includes: detecting and acquiring temperature information corresponding to multiple locations within the exhaust gas recirculation valve of the engine exhaust gas recirculation system; and determining that the regenerative performance of the engine exhaust gas recirculation system is at risk if any one of the temperature information corresponding to the multiple locations exceeds the design temperature.

[0035] This technical solution further provides a method for determining the regenerative performance. By acquiring temperature information corresponding to multiple locations within the exhaust gas recirculation valve, the regenerative temperature within the exhaust gas recirculation valve after the engine is stopped can be accurately identified, making the determination of the regenerative performance more accurate.

[0036] In one feasible implementation, if it is determined that there is a risk to the regenerative performance of the engine exhaust gas recirculation system, the method further includes: redesigning the layout of the exhaust gas recirculation valve based on temperature information corresponding to multiple location points; and / or determining the installation position of the heat shield based on the location points in the temperature information corresponding to multiple location points that exceed the design temperature; and installing the heat shield in the exhaust gas recirculation valve based on the installation position of the heat shield.

[0037] In this technical solution, after clarifying the risk of heat recovery performance of the engine exhaust gas recirculation system, it is explained that the current layout of the exhaust gas recirculation valve is unreasonable and may pose a risk during vehicle operation. Therefore, the layout or structure of the exhaust gas recirculation valve can be changed by rearranging the exhaust gas recirculation valve or by installing a heat shield in the exhaust gas recirculation valve, so as to make the use of the exhaust gas recirculation valve safer.

[0038] like Figure 2 and Figure 3As shown, according to a second aspect of the embodiments of this application, a performance testing system for an engine exhaust gas recirculation system is proposed, applicable to the performance testing method of any of the above-mentioned technical solutions. The performance testing system includes: an operating condition confirmation component, disposed at the intake pipe 110, cooler 120, and outlet pipe 140 of the engine exhaust gas recirculation system, for acquiring exhaust gas recirculation intake pressure, exhaust gas recirculation intake temperature, recirculation valve exhaust temperature, recirculation valve exhaust pressure, cooler 120 outlet water temperature, recirculation valve outlet water temperature, and coolant flow rate; wherein, the target operating condition is determined based on at least one of exhaust gas recirculation intake pressure, exhaust gas recirculation intake temperature, recirculation valve exhaust temperature, recirculation valve exhaust pressure, cooler 120 outlet water temperature, recirculation valve outlet water temperature, and coolant flow rate; and multiple temperature detection components 131 disposed within the exhaust gas recirculation valve 130.

[0039] The performance testing system for the engine exhaust gas recirculation system provided in this application embodiment collects the exhaust gas recirculation intake pressure, exhaust gas recirculation intake temperature, recirculation valve exhaust temperature, recirculation valve exhaust pressure, cooler 120 outlet water temperature, recirculation valve outlet water temperature, and coolant flow rate through the operating condition confirmation component during operation. It then further determines the exhaust gas recirculation valve 130 inlet temperature and exhaust temperature under different operating conditions, which enables more accurate identification of information under different operating conditions.

[0040] In one feasible implementation, the operating condition verification component includes: a first temperature sensor 111 and a first pressure sensor 112, disposed at the air inlet pipe 110; a second temperature sensor 121, a second pressure sensor 122, and a third temperature sensor 123, wherein the second temperature sensor 121 is disposed at the exhaust port of the circulation valve, and the second pressure sensor 122 and the third temperature sensor 123 are disposed on the cooler 120; a fourth temperature sensor 141, disposed at the water outlet of the circulation valve; and a flow meter 142, disposed at the water outlet of the circulation valve.

[0041] In this technical solution, the operating condition confirmation component may include a first temperature sensor 111 and a first pressure sensor 112. The exhaust gas recirculation intake temperature can be obtained by setting the first temperature sensor 111, and the exhaust gas recirculation intake pressure can be obtained by setting the first pressure sensor 112.

[0042] In this technical solution, the operating condition confirmation component may include a second temperature sensor 121, a second pressure sensor 122, and a third temperature sensor 123. The second temperature sensor 121 can obtain the exhaust temperature of the circulation valve, the second pressure sensor 122 can obtain the exhaust pressure of the circulation valve, and the third temperature sensor can obtain the outlet water temperature of the cooler 120.

[0043] In this technical solution, the operating condition confirmation component may include a fourth temperature sensor 141, which can be used to determine the outlet water temperature of the circulation valve.

[0044] In this technical solution, the operating condition verification component may include a flow meter 142, through which the coolant flow rate can be obtained.

[0045] It is understandable that the first temperature sensor 111, the second temperature sensor 121, the third temperature sensor 123, and the fourth temperature sensor 141 can be thermocouples.

[0046] The performance testing method provided in this application includes the following in the preparation stage: 1. Modify the EGR system by integrating the performance testing system of the engine exhaust gas recirculation system onto the EGR system. For example: use a specially modified EGR valve with internal thermocouples and arrange several measuring points; install temperature and pressure sensor mounting brackets on the cooler and EGR pipeline; special components for the cooling system include: water flow sensor and matching pipeline, and EGR outlet water hose temperature and pressure measuring fixtures. 2. Complete the visual inspection and individual performance testing of EGR system components; 3. Assemble the modified EGR system components onto the test engine as usual; 4. Assembly of special components for the cooling system: Connect the water flow sensor in series to the outlet pipe after the EGR valve, and assemble the EGR outlet pipe (which can measure the EGR outlet water pressure and temperature).

[0047] 5. On the engine test bench, test the airtightness of the EGR system, then connect the test bench measuring equipment to the temperature and pressure test channels of the EGR system components (connect the temperature and pressure sensor connectors arranged on the aforementioned EGR system components to the test bench measuring and acquisition equipment); before the formal test, ensure that the measured values ​​of each temperature and pressure sensor are valid and accurate. During the test, it is necessary to measure the engine's conventional data (power, torque, fuel consumption, engine coolant temperature, exhaust temperature, etc.) in real time. 6. Run the engine using the break-in specifications and record the engine's external characteristic data.

[0048] The performance testing method provided in this application includes the following steps during the testing phase: 1. General test conditions: 1.1 Intake System: The intake system adopts a laboratory system and is equipped with an intercooler temperature control system and piping; 1.2 Exhaust System: The exhaust system shall be either the vehicle-mounted exhaust system or a laboratory exhaust system with the same resistance, and shall not be blown by a fan; 1.3 Electrical System: The electrical system uses a test wiring harness, and the starting power and ECU power are provided by the bench system. Voltage and current should meet the requirements of the product technical documents. 1.4 Fuel Supply System: A laboratory fuel supply system shall be adopted, and the supply pressure shall meet the requirements of the product technical documents; 1.5 Engine installation on the test bench: The transmission system includes a test gearbox, which connects the dynamometer to the engine via a flexible coupling; 2. Special control conditions 2.1 Intercooler power point intake pressure drop control; 2.2 External Characteristics Turbine Inlet Exhaust Temperature Control; 2.3EGR uses the outlet water temperature at the operating point for control; 2.4 Intercooler rear intake temperature control; 2.5 No fan blowing; 2.6 Cooling System: Adopts automotive cooling system; 2.7 The specific operating conditions for the test need to be determined after the engine EGR system is calibrated.

[0049] 3. Test methods 3.1 Run the engine in accordance with the test standards.

[0050] 3.2 Select the operating point with the highest gas temperature before and after the EGR valve, maintain a reasonable water temperature, monitor the data at each measuring point, and quickly stop the machine after the outlet water temperature, exhaust temperature, etc. have stabilized. At the same time, start collecting data (≥20min).

[0051] 3.3 Each operating point was measured three times, and the data was recorded simultaneously.

[0052] The following data need to be recorded: exhaust gas temperature and pressure before the EGR valve; exhaust gas temperature after the EGR valve; water temperature and pressure after the EGR cooler; water temperature and pressure after the EGR valve; temperature at 13 measuring points of the EGR valve; and water flow rate in the EGR branch. 3.4 Other measurement parameters are the same as those in the routine engine test.

[0053] 4. Monitor the EGR system measurement parameters during the experiment. The data in the experiment were monitored using an engine test bench with a sampling frequency of 1Hz. The main monitored parameters included: engine speed, torque, fuel consumption, EGR valve opening, temperature T1, temperature T2, temperature T3, temperature T4, thermocouple temperature at each measuring point in the EGR valve, pressure P1, pressure P2, etc. The data in the test bench data logger were analyzed and processed.

[0054] The performance testing method provided in this application includes post-test evaluation: After the test, the temperatures measured by thermocouples at various points inside the EGR valve were compiled. The maximum temperature that could be reached at each measuring point of the EGR valve during the shutdown and reheat process after the engine was rapidly shut down from the highest exhaust temperature condition in the EGR operating range was determined to be within the allowable temperature range for that area.

[0055] If the temperature at all measuring points does not exceed the corresponding allowable temperature, it is determined that there is no risk; if any measuring point exceeds the allowable temperature, it is determined that there is a risk, and the layout of the EGR system should be optimized, or an EGR valve heat shield should be added to protect the internal structure of the valve body.

[0056] like Figure 4 As shown, according to a third aspect of the embodiments of this application, a computer-readable storage medium 401 is provided, which stores a computer program 402 to implement the performance testing method of any of the above technical solutions.

[0057] The computer-readable storage medium 401 provided in this application embodiment has all the beneficial effects of the performance testing method of the above-described technical solutions because it implements the performance testing method of any of the above-described technical solutions.

[0058] The computer-readable storage medium 401 provided in this application embodiment first controls the inlet temperature and exhaust temperature of the exhaust gas recirculation valve of the engine under different operating conditions, and further takes the operating condition corresponding to the maximum inlet temperature and the maximum exhaust temperature as the target operating condition, controls the engine to work under the target operating condition, and then controls the engine to stop. By detecting the temperature of the engine exhaust gas recirculation system, the highest temperature that the engine can reach during the shutdown and reheat process can be known. This can provide support and verification for the layout and design of the EGR system, and can assess the risk of shutdown and reheat under the worst operating conditions of the exhaust gas recirculation valve, thus avoiding engine failure.

[0059] Understandably, during vehicle design, the engine model typically remains fixed. By controlling the engine's operation under different conditions, it's possible to determine the inlet and exhaust temperatures of the exhaust gas recirculation (EGR) valve in the engine's exhaust gas recirculation (EGR) system under varying operating conditions. Higher inlet and exhaust temperatures result in higher regenerative heat energy at shutdown for the EGR valve, making it more prone to exceeding its permissible temperature. It's also understandable that, in the early stages of vehicle design, if the engine model is not yet determined, it's possible to obtain the EGR valve inlet and exhaust temperatures of different engines under various operating conditions.

[0060] Understandably, the target operating condition is the worst operating condition that the engine exhaust gas recirculation system is in when the engine is running, under which the probability of the exhaust gas recirculation valve temperature exceeding the allowable temperature is highest.

[0061] It is understandable that by controlling the engine to operate under the target conditions, the engine exhaust gas recirculation system will enter a stable temperature state after the first operating time has elapsed. In this case, controlling the engine to shut down can simulate the condition of the vehicle shutting down quickly. By collecting the temperature information of the engine exhaust gas recirculation system in this case, the shutdown and reheating state of the engine exhaust gas recirculation system can be analyzed.

[0062] like Figure 5 As shown, a control device is provided according to a fourth aspect of the embodiments of this application, comprising: a memory 501 storing a computer program; and a processor 502 executing the computer program; wherein, when executing the computer program, the processor 502 implements the performance detection method of any of the above-mentioned embodiments.

[0063] In this invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0064] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0065] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0066] 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-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] This application also provides a computer program product, which includes computer software instructions that, when executed on a processing device, cause the processing device to perform actions such as... Figure 1 The process of the application protection method in the corresponding embodiment.

[0071] The 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 processes or functions described in the embodiments of this application are 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, the 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)).

[0072] 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.

[0073] In the several embodiments provided in this application, it should be understood that the disclosed systems, 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 an indirect coupling or communication connection between apparatuses or units through some interfaces, and may be electrical, mechanical, or other forms.

[0074] 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.

[0075] 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.

[0076] 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 described in 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.

[0077] The above-described 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.

Claims

1. A performance testing method for an engine exhaust gas recirculation system, characterized in that, include: Obtain the inlet temperature and exhaust temperature of the exhaust gas recirculation valve in the engine exhaust gas recirculation system under different engine operating conditions; Among different operating conditions, the operating condition corresponding to the maximum inlet temperature and the maximum exhaust temperature is taken as the target operating condition. The engine is controlled to operate under target conditions, and after the first operating time has elapsed, the engine is controlled to stop, and the temperature information of the engine exhaust gas recirculation system is collected. Based on the temperature information, the regenerative performance of the engine exhaust gas recirculation system is determined, including: Temperature information corresponding to multiple locations within the exhaust gas recirculation valve of the engine exhaust gas recirculation system is detected and acquired. If any one of the temperature values ​​corresponding to the multiple location points exceeds the design temperature, it is determined that the heat recovery performance of the engine exhaust gas recirculation system is at risk.

2. The performance testing method for the engine exhaust gas recirculation system according to claim 1, characterized in that, Different engine operating conditions refer to at least one of the engine's speed, load, and torque being different.

3. The performance testing method for the engine exhaust gas recirculation system according to claim 1, characterized in that, The value of the first duration is determined based on the time required for the outlet water temperature and exhaust temperature of the engine exhaust gas recirculation system to return to a stable state from a fluctuating state under the target operating conditions.

4. The performance testing method for the engine exhaust gas recirculation system according to claim 1, characterized in that, Also includes: Obtain information on the highest temperature that the engine can reach under target operating conditions; The temperature of the cooling water in the engine exhaust gas recirculation system is maintained at the maximum temperature.

5. The performance testing method for the engine exhaust gas recirculation system according to claim 1, characterized in that, In cases where the regenerative performance of the engine exhaust gas recirculation system is deemed to be at risk, the following additional steps are also included: Based on temperature information corresponding to multiple location points, the layout of the exhaust gas recirculation valve is redesigned; and / or Based on the temperature information corresponding to the multiple location points, the location points that exceed the design temperature are determined to be the installation positions of the heat insulation cover. The heat insulation cover is installed in the exhaust gas recirculation valve based on the installation location of the heat insulation cover.

6. A performance testing system for an engine exhaust gas recirculation system, applied to the performance testing method according to any one of claims 1 to 5, characterized in that, The performance testing system includes: The operating condition verification component is installed at the intake pipe, cooler, and outlet pipe of the engine exhaust gas recirculation system to obtain the exhaust gas recirculation intake pressure, exhaust gas recirculation intake temperature, recirculation valve exhaust temperature, recirculation valve exhaust pressure, cooler outlet water temperature, recirculation valve outlet water temperature, and coolant flow rate. The target operating condition is determined based on at least one of the following: exhaust gas recirculation inlet pressure, exhaust gas recirculation inlet temperature, recirculation valve exhaust temperature, recirculation valve exhaust pressure, cooler outlet water temperature, recirculation valve outlet water temperature, and coolant flow rate. Multiple temperature detection components are installed inside the exhaust gas recirculation valve.

7. The performance testing system for the engine exhaust gas recirculation system according to claim 6, characterized in that, The operating condition verification component includes: A first temperature sensor and a first pressure sensor are located at the air intake pipe; A second temperature sensor, a second pressure sensor, and a third temperature sensor are provided. The second temperature sensor is located at the exhaust port of the circulation valve, and the second pressure sensor and the third temperature sensor are located on the cooler. The fourth temperature sensor is located at the outlet of the circulation valve; A flow meter is installed at the outlet of the circulation valve.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that implements the performance testing method as described in any one of claims 1 to 5.

9. A control device, characterized in that, include: Memory, which stores computer programs; The processor executes the computer program; Wherein, when the processor executes the computer program, it implements the performance detection method as described in any one of claims 1 to 5.

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