Air leakage detection method for air inlet pipeline of engine and related device

Abstract

The invention discloses an air leakage detection method for an air inlet pipeline of an engine and a related device, and relates to the technical field of engines. The theoretical air inlet flow is calculated according to the rotating speed of the engine, the air inlet pressure of the intercooler, the air inlet temperature of the intercooler and the displacement of the engine, the inflation efficiency is calculated based on the actual air inlet flow and the theoretical air inlet flow, the inflation power is processed in a power accumulation window mode, and the average inflation efficiency value is obtained. And finally, judging whether the inflation efficiency average value exceeds a preset inflation efficiency limit value or not, judging that the pipeline leaks air when the inflation efficiency average value exceeds the preset inflation efficiency limit value, and otherwise, judging that the pipeline does not leak air. According to the method, the inflation efficiency is calculated through the parameters obtained in real time, and compared with a calibration parameter calculation mode in the prior art, the accuracy is high; the air inflation power of the engine is processed in a power accumulation window mode, and the accuracy of air leakage detection is further improved.

Description

Technical Field

[0001] The present application relates to the field of engine technology, and in particular to a method and a related device for detecting air leakage in an engine intake pipe. Background Art

[0002] Leakage in the engine intake pipe will reduce the amount of air entering the engine. If the leakage in the engine intake pipe is not diagnosed in time, it will cause the engine combustion to deteriorate and quickly clog the DPF (Diesel Particulate Filter), resulting in problems such as increased engine fuel consumption and insufficient power. In severe cases, it will cause the DPF to fall out or burn out.

[0003] In order to avoid the above-mentioned problems caused by air leakage in the air intake line, the prior art adopts the method of calculating and comparing the deviation between the actual air intake pressure of the engine air intake line and the set air intake pressure to diagnose air leakage in the air intake line. However, in this air leakage diagnosis method, the set air intake pressure is calibrated during the bench test stage, ignoring the fact that the supercharger cannot maintain consistent performance under all working conditions, and the natural deviation of the set air intake pressure caused by changes in the external environment, resulting in inaccurate diagnostic results of the air leakage diagnosis method in the prior art. Summary of the invention

[0004] In view of the above problems, the present application provides a method and related device for detecting air leakage in the engine intake pipe, so as to achieve the purpose of accurately diagnosing whether the engine intake pipe is leaking. The specific scheme is as follows:

[0005] In a first aspect, the present application provides a method for detecting air leakage in an engine intake pipe, which is applied to an electronic control unit. The method comprises:

[0006] Obtain engine speed and engine torque;

[0007] When the engine speed, engine torque and valve status of the exhaust gas recirculation system meet the leakage detection conditions, the engine theoretical intake flow rate is determined according to the engine speed, intercooler intake pressure, intercooler intake temperature and engine displacement;

[0008] The engine charging efficiency is determined by using the actual engine intake flow and the engine theoretical intake flow;

[0009] The power accumulation window method is used to process the engine charging efficiency and obtain the average value of the charging efficiency;

[0010] Determine whether the average value of the charging efficiency exceeds the preset charging efficiency limit. When the average value of the charging efficiency exceeds the preset charging efficiency limit, it is determined that the engine intake pipe is leaking; when the average value of the charging efficiency does not exceed the preset charging efficiency limit, it is determined that the engine intake pipe is not leaking.

[0011] In a possible implementation, the gas leakage detection condition is that the engine speed reaches a preset speed threshold, the engine torque reaches a preset torque threshold, and all valves of the exhaust gas recirculation system are in a closed state.

[0012] In one possible implementation, the calculation formula of the engine theoretical intake air flow rate is:

[0013] Theoretical engine intake flow = preset calculation coefficient × engine speed × engine displacement × intercooler intake pressure / intercooler intake temperature.

[0014] In a possible implementation, the engine charging efficiency is the ratio of the actual intake flow rate of the engine to the theoretical intake flow rate of the engine.

[0015] In a possible implementation, the power accumulation window method is used to process the engine charging efficiency to obtain the average charging efficiency, including:

[0016] The engine speed and the engine torque are used to determine the engine power;

[0017] Accumulating the engine power to obtain a power accumulation value;

[0018] Accumulating the engine charging efficiency to obtain a charging efficiency accumulation value;

[0019] When the accumulated value of the engine power reaches a preset power threshold, the average value of the accumulated values ​​of the charging efficiency is calculated to obtain the average value of the charging efficiency.

[0020] A second aspect of the present application provides a gas leakage detection device for an engine intake pipe, comprising:

[0021] An acquisition unit, a first determination unit, a second determination unit, a processing unit and a judgment unit; wherein:

[0022] An acquisition unit, used for acquiring engine speed and engine torque;

[0023] A first determination unit is used to determine the theoretical engine intake flow rate according to the engine speed, the intercooler intake pressure, the intercooler intake temperature and the engine displacement when the engine speed, the engine torque and the valve state of the exhaust gas recirculation system meet the leakage detection conditions;

[0024] A second determination unit is used to determine the engine charging efficiency by using the actual engine intake flow rate and the engine theoretical intake flow rate;

[0025] A processing unit, used for processing the engine charging efficiency by using a power accumulation window method to obtain an average value of the charging efficiency;

[0026] The judgment unit is used to judge whether the average value of the charging efficiency exceeds the preset charging efficiency limit. When the average value of the charging efficiency exceeds the preset charging efficiency limit, it is judged that the engine intake pipe is leaking; when the average value of the charging efficiency does not exceed the preset charging efficiency limit, it is judged that the engine intake pipe is not leaking.

[0027] In a possible implementation, the processing unit is configured to:

[0028] The engine speed and the engine torque are used to determine the engine power;

[0029] Accumulating the engine power to obtain a power accumulation value;

[0030] Accumulating the engine charging efficiency to obtain a charging efficiency accumulation value;

[0031] When the accumulated value of the engine power reaches a preset power threshold, the average value of the accumulated values ​​of the charging efficiency is calculated to obtain the average value of the charging efficiency.

[0032] A second aspect of the present application provides a computer program product, comprising computer-readable instructions, which, when executed on an electronic device, enables the electronic device to implement the method for detecting air leakage in an engine intake line as described in any one of claims 1 to 5.

[0033] A third aspect of the present application provides a gas leakage detection device for an engine intake pipe, comprising at least one processor and a memory connected to the processor, wherein:

[0034] The memory is used to store computer programs;

[0035] The processor is used to execute a computer program so that the electronic device can implement the method for detecting air leakage in an engine intake line as described in any one of the above.

[0036] A fourth aspect of the present application provides a computer storage medium, which carries one or more computer programs. When the one or more computer programs are executed by an electronic device, the electronic device can implement the engine intake pipe leakage detection method as described in any one of the above.

[0037] A fifth aspect of the present application provides a computer storage medium, which carries one or more computer programs. When the one or more computer programs are executed by an electronic device, the electronic device can implement the method for detecting air leakage in the engine intake pipe according to the first aspect or any implementation of the first aspect.

[0038] By means of the above technical scheme, the present application provides a method and related device for detecting air leakage in the engine intake pipe. After the engine speed, engine torque and valve status of the exhaust gas recirculation system meet the air leakage detection conditions, the engine speed, intercooler intake pressure, intercooler intake temperature and engine displacement are used to calculate the theoretical intake flow of the engine, and the engine charging efficiency is calculated based on the actual intake flow and theoretical intake flow of the engine. The engine charging power is processed by a power accumulation window to obtain the average charging efficiency. Finally, it is determined whether the average charging efficiency exceeds the preset charging efficiency limit. When the average charging efficiency exceeds the preset charging efficiency limit, it is determined that the engine intake pipe is leaking. Otherwise, there is no leakage. The present application uses various parameters obtained in real time to calculate the engine's charging efficiency in real time. Compared with the method of calculating and judging by calibrated parameters in the known technology, it has high accuracy. In addition, the engine charging power is processed by a power accumulation window, which further improves the accuracy of air leakage detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. Throughout the accompanying drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and the originals and elements are not necessarily drawn to scale.

[0040] Figure 1 A flow chart of a method for detecting air leakage in an engine intake pipe is provided for this application;

[0041] Figure 2 A comparison diagram of the charging efficiency of the engine intake pipe in a normal state and in a leaky state provided by the present application;

[0042] Figure 3 A schematic diagram of the connection of detection devices for the method for detecting air leakage in the engine intake pipe provided by the present application;

[0043] Figure 4 An example flow chart of an engine intake pipe leakage detection method provided by the present application;

[0044] Figure 5 A schematic structural diagram of an engine air intake pipeline air leakage detection device provided in an embodiment of the present application;

[0045] Figure 6 It is a structural schematic diagram of the gas leakage detection equipment for the engine intake pipe in the embodiment of the present application. DETAILED DESCRIPTION

[0046] The following describes the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. The terms used in the implementation method section of the present application are only used to explain the specific embodiments of the present application, and are not intended to limit the present application.

[0047] The embodiments of the present application are described below in conjunction with the accompanying drawings. Those skilled in the art will appreciate that, with the development of technology and the emergence of new scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0048] The terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and need not be used to describe a specific order or sequential order. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, which is only to describe the distinction mode adopted by the objects of the same attributes when describing in the embodiments of the present application. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, so that the process, method, system, product or equipment comprising a series of units need not be limited to those units, but may include other units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0049] The intake pipe is an important part of the engine. It is mainly responsible for delivering air to the combustion chamber of the engine. When the intake pipe leaks, a series of adverse effects will occur:

[0050] Power loss: Because the engine cannot normally inhale enough air, the ratio of fuel to air is unbalanced, resulting in reduced fuel efficiency and insufficient engine power.

[0051] Difficulty in starting: Leakage in the engine intake pipe will cause the combustible mixture to become thin, making it difficult to reach the concentration required for starting, so it will be difficult to start the vehicle where the engine is located.

[0052] Unstable idle speed: Leakage in the intake pipe and changes in the internal pressure of the engine will make the mixture too lean or uneven, resulting in unstable engine idle speed, fluctuating up and down.

[0053] Increased fuel consumption: In order to maintain normal power output, an engine with air leakage in the intake pipe will increase the amount of fuel injection.

[0054] Increased risk of engine damage: Long-term intake line leakage can cause excessive wear on internal engine parts, increasing repair costs and the risk of engine failure.

[0055] The adverse effects caused by air leakage in the engine intake pipe include but are not limited to those described above. In order to solve the above problems, the prior art uses a method of comparing the deviation between the actual intake pressure of the engine intake pipe and the set intake pressure to diagnose whether the intake pipe is leaking. However, the set intake pressure is calibrated during the bench test stage, resulting in inaccurate diagnostic results of the prior art leakage diagnosis method.

[0056] In addition, the air intake pipe leakage detection method in the prior art can only be performed under stable working conditions, which is a relatively harsh condition. Therefore, there is a situation where the vehicle cannot meet the detection conditions and the leakage cannot be discovered in time.

[0057] In order to solve the above problems, the present application provides a method and related device for detecting air leakage in an engine intake pipe.

[0058] Optional, see Figure 1 , a flow chart of a method for detecting air leakage in an engine intake pipe provided by the present application. Figure 1 As shown, the method for detecting air leakage in the engine intake pipe includes the following steps:

[0059] Step 101: Obtain engine speed and engine torque.

[0060] It should be noted that this specific embodiment is applied to an electronic control unit (ECU), and the ECU has fast response and precise control.

[0061] Optionally, the ECU can obtain the engine speed and torque through a variety of sensors.

[0062] Specifically, the ECU can obtain engine speed and torque information through the crankshaft position sensor, camshaft position sensor, throttle position sensor, oxygen sensor and other auxiliary sensors.

[0063] Step 102: When the engine speed, the engine torque and the valve state of the exhaust gas recirculation system meet the leakage detection conditions, the engine theoretical intake flow rate is determined according to the engine speed, the intercooler intake pressure, the intercooler intake temperature and the engine displacement.

[0064] It should be noted that the leakage detection conditions are that the engine is in normal operation and the engine speed reaches a preset speed threshold, the engine torque reaches a preset torque threshold, and all valves of the exhaust gas recirculation system (EGR, Exhaust GasRecirculation) are in a closed state.

[0065] Specifically, the preset speed threshold may be set as n1, and the preset torque threshold may be set as T1. It should be noted that the requirement that the engine speed and torque must exceed the preset threshold is because if the engine speed and torque are too small, the result will be greatly deviated. The EGR valve must be completely closed because if the EGR valve is opened, it will affect the calculation of the charging efficiency, and the calculated charging efficiency will be low, and the calculation result of the charging efficiency will be different due to different EGR openings.

[0066] It should also be noted that the intake pressure and intake temperature of the intercooler can be obtained through the intake temperature sensor and the intake pressure sensor, and can also be directly obtained through the temperature and pressure sensor. The intake temperature sensor and the intake pressure sensor, or the temperature and pressure sensor are generally installed on the intake pipe after the intercooler; the engine displacement can be obtained through information such as the vehicle's year, manufacturer, model, and the OEM part number on the engine ECU.

[0067] The theoretical intake air flow of the engine mainly refers to the theoretical intake air flow of MAF (Mass Air Flow, intake air flow sensor). MAF sensor is one of the important components of the engine, mainly used to measure the fresh intake air flow of the engine and send the measured data to ECU to control a series of controls such as fuel injection amount and smoke correction.

[0068] In the present application, the theoretical intake air flow is calculated in real time based on the engine speed, the intercooler intake air pressure, the intercooler intake air temperature and the engine displacement.

[0069] Specifically, the calculation formula of the theoretical intake air flow rate can be:

[0070] Theoretical engine intake flow = preset calculation coefficient × engine speed × engine displacement × intercooler intake pressure / intercooler intake temperature;

[0071] Among them, the preset calculation coefficient can be 0.03×0.3484, so the calculation formula of the above theoretical intake air flow rate can be:

[0072] Theoretical engine intake flow = 0.03 × 0.3484 × engine speed × engine displacement × intercooler intake pressure / (intercooler intake temperature + 273.15).

[0073] Optionally, when the engine is in normal operating mode, and the engine speed reaches a preset speed threshold, the engine torque reaches a preset torque threshold and all valves of the exhaust gas recirculation system are closed, the engine theoretical intake flow is calculated based on the real-time acquired engine speed, intercooler intake pressure, intercooler intake temperature and engine displacement.

[0074] Step 103: Determine the engine charging efficiency using the actual engine intake flow rate and the engine theoretical intake flow rate.

[0075] The actual intake flow rate of the engine corresponds to the theoretical intake flow rate of the engine, which is obtained by real-time measurement of the MAF.

[0076] The calculation formula of engine charging efficiency can be:

[0077] Engine charging efficiency = engine actual intake flow rate / engine theoretical intake flow rate.

[0078] Optionally, the engine charging efficiency is calculated using the above-mentioned calculation formula for the engine charging efficiency.

[0079] Step 104: Use the power accumulation window method to process the engine charging efficiency to obtain an average charging efficiency.

[0080] The processing flow of the power accumulation window method mainly includes:

[0081] The engine power is determined by the engine speed and the engine torque. The engine power may be calculated by the following formula: engine power = engine speed × engine torque / 9550.

[0082] The engine powers are accumulated to obtain a power accumulation value, and at the same time, the engine charging efficiencies are accumulated to obtain a charging efficiency accumulation value.

[0083] When the accumulated value of the engine power reaches a preset power threshold, the average value of the accumulated value of the charging efficiency is calculated to obtain the average value of the charging efficiency. The preset power threshold is a preset accumulated limit value.

[0084] It should be noted that the power accumulation window method, which first accumulates and then calculates the average value of the inflation efficiency, can further improve the accuracy of the diagnosis result.

[0085] Optionally, the engine power is calculated and accumulated, and at the same time, the engine charging power is accumulated until the engine power accumulated value reaches a preset accumulation limit, and the average value of the engine charging power accumulated value during the accumulation period is calculated.

[0086] Step 105, determine whether the average value of the charging efficiency exceeds the preset charging efficiency limit. When the average value of the charging efficiency exceeds the preset charging efficiency limit, determine that the engine intake pipe is leaking; when the average value of the charging efficiency does not exceed the preset charging efficiency limit, determine that the engine intake pipe is not leaking.

[0087] It should be noted that the charging efficiency during normal engine operation is generally between 0.86 and 0.96. When the engine intake line leaks, MAF will count the leaked intake volume into the actual intake volume of the engine, which results in the actual measured value of MAF being higher than the actual intake volume entering the engine. However, the theoretical intake volume is calculated based on the actual measurement data collected from the intake temperature and pressure sensor on the engine, and the collected results are not affected by the intake line leak. It is understandable that if the engine intake line leaks, the average value of the charging efficiency will be greater than when there is no leak.

[0088] For example, see Figure 2 , the present application provides a comparison diagram of the charging efficiency under the normal state of the engine intake pipe and the state of the engine intake pipe leaking. Figure 2 It can be seen that the charging efficiency of the engine intake pipe under normal conditions is about 1, and the charging efficiency when the engine intake pipe is leaking is higher than the charging efficiency under normal conditions.

[0089] Therefore, the preset charging efficiency limit value can be set to 1. If the average value of the charging efficiency is greater than 1, it is determined that the intake pipe is leaking. If the average value of the charging efficiency is less than 1, it is determined that the intake pipe is not leaking.

[0090] Optionally, when the average value of the charging efficiency exceeds a preset charging efficiency limit, it is determined that the intake pipeline is leaking; otherwise, it is determined that there is no leakage.

[0091] Optional, see Figure 3 , a schematic diagram of the connection of detection devices for the engine intake pipe leakage detection method provided in the present application.

[0092] Among them, ECU is an electronic control unit, which is mainly responsible for obtaining data from various devices, such as Figure 2 As shown in the figure, the ECU can obtain the intake temperature and pressure of the intercooler from the temperature and pressure sensor, and the actual intake flow of the engine from the MAF. In addition, the ECU can also obtain data such as engine speed, engine displacement, and the valve status of the EGR system from other sensors.

[0093] In summary, the present application provides a method for detecting air leakage in the engine intake pipe, after the engine speed, engine torque and valve status of the exhaust gas recirculation system meet the air leakage detection conditions, the engine speed, intercooler intake pressure, intercooler intake temperature and engine displacement are used to calculate the theoretical intake flow of the engine, the engine charging efficiency is calculated based on the actual intake flow of the engine and the theoretical intake flow, and the engine charging power is processed in a power accumulation window manner to obtain the average charging efficiency. Finally, it is determined whether the average charging efficiency exceeds the preset charging efficiency limit. When the average charging efficiency exceeds the preset charging efficiency limit, it is determined that the engine intake pipe is leaking, otherwise, there is no leakage. The present application uses various parameters obtained in real time to calculate the engine's charging efficiency in real time. Compared with the method of calculating and judging by calibrated parameters in the known technology, it has high accuracy, and the engine charging power is processed in a power accumulation window manner, which further improves the accuracy of air leakage detection.

[0094] For example, see Figure 4 , an example flow chart of a method for detecting air leakage in an engine intake line provided in the present application.

[0095] like Figure 4 As shown, the prerequisite for performing engine intake pipe leakage detection in the present application is that the engine is in normal operating state, the EGR valve is fully closed, the speed is greater than n1, and the torque is greater than T1. When these prerequisites are met, it is possible to detect in real time whether the engine intake pipe is leaking.

[0096] ECU will obtain the speed, intercooler intake pressure, intercooler intake temperature and displacement, and calculate the MAF theoretical intake flow based on these parameters, and at the same time obtain the MAF actual intake flow. Calculate the ratio of the actual intake flow of MAF to the theoretical intake flow of MAF to obtain the charging efficiency, and accumulate the charging efficiency; at the same time, calculate the engine power based on the speed and torque, and accumulate the engine power until the accumulated value of the engine power reaches the limit a. At this time, calculate the average value of the accumulated value of the charging efficiency to obtain the average value b, and judge whether the average value b is greater than the limit c. When the average value b is greater than the limit c, diagnose that the engine intake pipe is leaking. When the average value is less than the limit c, diagnose that the engine intake pipe is not leaking.

[0097] In summary, the present application calculates the charging efficiency through real-time measurement of parameters such as the intake pressure of the intercooler and the intake temperature of the intercooler, thereby improving the accuracy of the diagnostic results, eliminating the false detection caused by the natural deviation caused by the consistency of the supercharger and the difference in external environmental pressure, and reducing the market failure rate. In addition, the power accumulation window method is used for diagnosis, which reduces false detection and improves the credibility of the test results. In addition, the engine intake pipe leakage detection method of the present application has relatively low requirements for diagnostic conditions, and can perform real-time diagnosis, detect leakage in time, and avoid DPF blockage, burning, detachment and other temperatures caused by the inability to detect leakage in time.

[0098] A method for detecting air leakage in an engine air intake line provided in an embodiment of the present application is introduced above. A device for executing the above method for detecting air leakage in an engine air intake line will be introduced below.

[0099] See also Figure 5 , Figure 5 The present invention provides a schematic diagram of a gas leakage detection device for an engine intake pipe according to an embodiment of the present invention. Figure 5 As shown, the gas leakage detection device for the engine intake pipe includes an acquisition unit 10, a first determination unit 20, a second determination unit 30, a processing unit 40 and a judgment unit 50, wherein:

[0100] An acquisition unit 10, used to acquire engine speed and engine torque;

[0101] A first determination unit 20, for determining the theoretical engine intake flow rate according to the engine speed, the intercooler intake pressure, the intercooler intake temperature and the engine displacement when the engine speed, the engine torque and the valve state of the exhaust gas recirculation system meet the gas leakage detection condition;

[0102] A second determination unit 30, for determining the engine charging efficiency by using the actual engine intake flow rate and the engine theoretical intake flow rate;

[0103] The processing unit 40 is used to process the engine charging efficiency by using a power accumulation window method to obtain an average charging efficiency;

[0104] The judgment unit 50 is used to judge whether the average value of the charging efficiency exceeds the preset charging efficiency limit. When the average value of the charging efficiency exceeds the preset charging efficiency limit, it is judged that the engine intake pipe is leaking; when the average value of the charging efficiency does not exceed the preset charging efficiency limit, it is judged that the engine intake pipe is not leaking.

[0105] In one embodiment, the gas leakage detection condition in the first determination unit 20 is that the engine speed reaches a preset speed threshold, the engine torque reaches a preset torque threshold, and all valves of the exhaust gas recirculation system are in a closed state.

[0106] In one embodiment, the calculation formula of the engine theoretical intake air flow rate in the first determination unit 20 is:

[0107] Theoretical engine intake flow = preset calculation coefficient × engine speed × engine displacement × intercooler intake pressure / intercooler intake temperature.

[0108] In one implementation, the engine charging efficiency in the second determination unit 30 is a ratio of an actual intake flow rate of the engine to a theoretical intake flow rate of the engine.

[0109] In one implementation, the processing unit 40 is specifically configured to:

[0110] The engine speed and the engine torque are used to determine the engine power;

[0111] Accumulating the engine power to obtain a power accumulation value;

[0112] Accumulating the engine charging efficiency to obtain a charging efficiency accumulation value;

[0113] When the accumulated value of the engine power reaches a preset power threshold, the average value of the accumulated values ​​of the charging efficiency is calculated to obtain the average value of the charging efficiency.

[0114] The present application also provides a leakage detection device for an engine intake pipe. Figure 6 As shown, it shows a schematic diagram of the structure of the engine intake pipe leakage detection device suitable for implementing the embodiment of the present application. The electronic device in the embodiment of the present application may include but is not limited to fixed terminals such as mobile phones, laptops, PDAs (personal digital assistants), PADs (tablet computers), desktop computers, etc. Figure 6 The air leakage detection device for the engine intake pipe shown is only an example and should not bring any limitation to the function and scope of use of the embodiments of the present application.

[0115] like Figure 6 As shown, the gas leakage detection device for the engine intake pipe may include a processing device (such as a central processing unit, a graphics processing unit, etc.) 601, which can perform various appropriate actions and processes according to the program stored in the read-only memory (ROM) 602 or the program loaded from the storage device 608 to the random access memory (RAM) 603. When the electronic device is powered on, the RAM 603 also stores various programs and data required for the operation of the electronic device. The processing device 601, the ROM 602 and the RAM 603 are connected to each other through a bus 604. The input / output (I / O) interface 605 is also connected to the bus 604.

[0116] Typically, the following devices may be connected to the I / O interface 605: an input device 606 including, for example, a touch screen, a touch pad, a keyboard, a mouse, a camera, a microphone, an accelerometer, a gyroscope, etc.; an output device 607 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; a storage device 608 including, for example, a memory card, a hard disk, etc.; and a communication device 609. The communication device 609 may allow the electronic device to communicate with other devices wirelessly or by wire to exchange data. Although Figure 6 The gas leakage detection device of the engine intake line with various devices is shown, but it should be understood that it is not required to implement or possess all the devices shown. More or fewer devices may be implemented or possessed instead.

[0117] Also provided in an embodiment of the present application is a computer program product including computer-readable instructions. When the computer-readable instructions are executed on an electronic device, the electronic device implements any one of the engine intake line air leakage detection methods provided in the embodiments of the present application.

[0118] A computer-readable storage medium is also provided in an embodiment of the present application. The storage medium carries one or more computer programs. When one or more computer programs are executed by an electronic device, the electronic device can implement any one of the engine intake pipe leakage detection methods provided in the embodiment of the present application.

[0119] It should also be noted that the device embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed over multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. In addition, in the drawings of the device embodiments provided by the present application, the connection relationship between the modules indicates that there is a communication connection between them, which may be specifically implemented as one or more communication buses or signal lines.

[0120] Through the description of the above implementation mode, the technicians in the field can clearly understand that the present application can be implemented by means of software plus necessary general hardware, and of course, it can also be implemented by special hardware including special integrated circuits, special CPUs, special memories, special components, etc. In general, all functions completed by computer programs can be easily implemented by corresponding hardware, and the specific hardware structure used to implement the same function can also be various, such as analog circuits, digital circuits or special circuits. However, for the present application, software program implementation is a better implementation mode in more cases. Based on such an understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a readable storage medium, such as a computer floppy disk, a U disk, a mobile hard disk, a ROM, a RAM, a disk or an optical disk, etc., including a number of instructions to enable a computer device (which can be a personal computer, a training device, or a network device, etc.) to execute the method of each embodiment of the present application.

[0121] In the above embodiments, all or part of the embodiments may be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or part of the embodiments may be implemented in the form of a computer program product.

[0122] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the process or function according to the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website site, a computer, a training device or a data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, training device or data center. The computer-readable storage medium can be any available medium that a computer can store or a data storage device such as a training device, a data center, etc. that includes one or more available media integration. Available media can be magnetic media, (e.g., floppy disk, hard disk, tape), optical media (e.g., DVD), or semiconductor media (e.g., solid-state hard disk (SSD)), etc.

Claims

1. A method for detecting air leakage in an engine intake pipe, characterized in that: Applied to an electronic control unit, the method comprises: Obtain engine speed and engine torque; When the engine speed, the engine torque and the valve state of the exhaust gas recirculation system meet the air leakage detection condition, determining the engine theoretical intake flow rate according to the engine speed, the intercooler intake pressure, the intercooler intake temperature and the engine displacement; Determining the engine charging efficiency by using the actual engine intake flow and the theoretical engine intake flow; The engine charging efficiency is processed by a power accumulation window method to obtain an average charging efficiency; Determine whether the average value of the charging efficiency exceeds a preset charging efficiency limit. When the average value of the charging efficiency exceeds the preset charging efficiency limit, determine that the engine intake pipe is leaking; when the average value of the charging efficiency does not exceed the preset charging efficiency limit, determine that the engine intake pipe is not leaking.

2. The method for detecting air leakage in an engine intake pipe according to claim 1, characterized in that: The gas leakage detection condition is that the engine speed reaches a preset speed threshold, the engine torque reaches a preset torque threshold, and all valves of the exhaust gas recirculation system are in a closed state.

3. The method for detecting air leakage in an engine intake pipe according to claim 1, characterized in that: The calculation formula of the theoretical intake air flow rate of the engine is: Theoretical engine intake flow = preset calculation coefficient × engine speed × engine displacement × intercooler intake pressure / intercooler intake temperature.

4. The method for detecting air leakage in an engine intake pipe according to claim 1, characterized in that: The engine charging efficiency is the ratio of the actual intake flow rate of the engine to the theoretical intake flow rate of the engine.

5. The method for detecting air leakage in an engine intake pipe according to claim 1, characterized in that: The power accumulation window method is used to process the engine charging efficiency to obtain the average charging efficiency, including: determining engine power using the engine speed and the engine torque; Accumulating the engine power to obtain a power accumulation value; Accumulating the engine charging efficiency to obtain a charging efficiency accumulated value; When the engine power accumulation value reaches a preset power threshold, the average value of the charging efficiency accumulation value is calculated to obtain the charging efficiency average value.

6. A gas leakage detection device for an engine intake pipe, characterized in that: include: An acquisition unit, a first determination unit, a second determination unit, a processing unit and a judgment unit; wherein: The acquisition unit is used to acquire the engine speed and the engine torque; The first determination unit is used to determine the theoretical engine intake flow rate according to the engine speed, the intercooler intake pressure, the intercooler intake temperature and the engine displacement when the engine speed, the engine torque and the valve state of the exhaust gas recirculation system meet the air leakage detection condition; The second determination unit is used to determine the engine charging efficiency by using the actual intake flow rate of the engine and the theoretical intake flow rate of the engine; The processing unit is used to process the engine charging efficiency by using a power accumulation window method to obtain an average charging efficiency; The judgment unit is used to judge whether the average value of the charging efficiency exceeds the preset charging efficiency limit. When the average value of the charging efficiency exceeds the preset charging efficiency limit, it is judged that the engine intake pipe is leaking; when the average value of the charging efficiency does not exceed the preset charging efficiency limit, it is judged that the engine intake pipe is not leaking.

7. The engine intake pipe leakage detection device according to claim 6, characterized in that: The processing unit is used for: determining engine power using the engine speed and the engine torque; Accumulating the engine power to obtain a power accumulation value; Accumulating the engine charging efficiency to obtain a charging efficiency accumulated value; When the engine power accumulation value reaches a preset power threshold, the average value of the charging efficiency accumulation value is calculated to obtain the charging efficiency average value.

8. A computer program product, characterized in that It comprises computer-readable instructions, and when the computer-readable instructions are executed on an electronic device, the electronic device implements the method for detecting air leakage in an engine intake line as claimed in any one of claims 1 to 5.

9. An engine air intake pipeline leakage detection device, characterized in that: The method comprises at least one processor and a memory connected to the processor, wherein: The memory is used to store computer programs; The processor is used to execute the computer program so that the electronic device can implement the method for detecting air leakage in an engine intake line as described in any one of claims 1 to 5.

10. A computer storage medium, characterized in that: The storage medium carries one or more computer programs, which, when executed by an electronic device, enable the electronic device to implement the method for detecting air leakage in an engine intake line as described in any one of claims 1 to 5.

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