Combustion chamber volume detection method and related device

Abstract

The invention discloses a combustion chamber volume detection method and a related device, and relates to the technical field of engines, according to the scheme, the first part volume is the volume of the part, protruding out of the top face of an engine cylinder body, of a piston, and the second part volume is the volume of the piston; the volume of the second part is the volume of a combustion chamber part formed by the plane where the cylinder hole is located and the concave part at the top of the piston; and then determining the volume compensation amount, and calculating the volume of the combustion chamber based on the first partial volume, the second partial volume and the first volume compensation amount. Compared with a traditional titration method, liquid does not need to be dripped, the volume of the combustion chamber can be rapidly and cleanly measured, and the consistency of measurement results is high.

Description

Technical Field

[0001] The present application relates to the technical field of engines, and particularly to a method for detecting the combustion chamber volume and related devices. Background Art

[0002] The size of the combustion chamber volume of an engine directly affects the concentration and combustion speed of the air-fuel mixture inside the combustion chamber. A smaller volume can increase the air-fuel ratio, accelerate the combustion speed of the fuel, thereby improving the combustion efficiency and reducing the exhaust emissions generated by combustion. Therefore, accurately measuring the combustion chamber volume is crucial for controlling exhaust emissions and improving combustion efficiency.

[0003] Currently, the titration method is generally used to detect the combustion chamber volume after the engine cylinder block and piston are assembled. The measurement process of the titration method is as follows: Before the piston is assembled, a circle of sealing grease is applied inside the cylinder bore. Then, the crankshaft is rotated to make the piston move upward to the top dead center position. A layer of sealing grease is applied on the surface of the titration tooling, and it is buckled on the top surface of the cylinder block. Finally, kerosene is injected into the combustion chamber until it is full, and the volume of the combustion chamber is calculated based on the injection volume.

[0004] The applicant has found through research that the solution for measuring the combustion chamber volume using the titration method has the following disadvantages:

[0005] 1. The core of the titration method relies on calculating based on the volume of the injected kerosene. After measurement, some kerosene will remain in the cylinder bore and on the top surface of the piston, affecting the overall cleanliness of the engine, and it is time-consuming and laborious to manually remove it with an air gun.

[0006] 2. When measuring using the titration method, the measurement time for each cylinder on average requires at least 3 - 5 minutes, and the cycle time is relatively long. As the combustion chamber volume is a core parameter affecting the engine compression ratio, the detection frequency requirement is relatively high. Such a long cycle time is not conducive to increasing the detection frequency and has a greater impact on quality control.

[0007] 3. The titration method requires manual operation, and the stability and consistency of titration measurement are poor. For multiple measurements of the same part, there are also deviations in each result. Summary of the Invention

[0008] In view of the above problems, the present application provides a method for detecting the combustion chamber volume and related devices to provide a fast, efficient and non-polluting detection solution for the combustion chamber volume of the engine. The specific solution is as follows:

[0009] The first aspect of the present application provides a method for detecting the combustion chamber volume, including:

[0010] A method for detecting the combustion chamber volume, including:

[0011] Obtain the volume of the first part and the volume of the second part. The volume of the first part is the volume of the part where the piston protrudes from the top surface of the engine cylinder block, and the volume of the second part is the volume of the combustion chamber part formed by the plane where the cylinder bore is located and the recessed part of the piston top;

[0012] Determine the first volume compensation amount;

[0013] Calculate the combustion chamber volume based on the volume of the first part, the volume of the second part, and the first volume compensation amount.

[0014] Optionally, in the above combustion chamber volume detection method, obtaining the volume of the first part and the volume of the second part includes:

[0015] Obtain the three-dimensional model of the combustion chamber corresponding to the measured piston of the measured engine, and at least part of the area of the piston top of the measured piston protrudes from the engine cylinder bore;

[0016] Based on the three-dimensional model, calculate the volume of the first part and the volume of the second part.

[0017] Optionally, in the above combustion chamber volume detection method, determining the first volume compensation amount includes:

[0018] Calculate the height difference between the top surface of the piston and the top surface of the engine cylinder block based on the three-dimensional model, and calculate the first volume compensation amount based on the height difference and the cylinder diameter size.

[0019] Optionally, in the above combustion chamber volume detection method, calculating the combustion chamber volume based on the volume of the first part, the volume of the second part, and the first volume compensation amount includes:

[0020] Based on the formula V combustion chamber =V down -V up -V h Calculate the combustion chamber volume V combustion chamber where the V up is the volume of the first part, the V down is the volume of the second part, and the V h is the first volume compensation amount.

[0021] Optionally, in the above combustion chamber volume detection method, after calculating the combustion chamber volume, it further includes:

[0022] Determine the clearance volume compensation amount between the piston and the cylinder block, and compensate the combustion chamber volume with the clearance volume compensation amount.

[0023] Optionally, in the above combustion chamber volume detection method, before compensating the combustion chamber volume with the clearance volume compensation amount, it further includes:

[0024] Based on the formula V clearance =[π×(D cylinder / 2)² - π×(D piston / 2) 2 ×h piston the clearance volume compensation V between the piston and the cylinder block is calculated clearance ;

[0025] wherein, D cylinder represents the piston diameter, and h piston represents the piston fire deck height.

[0026] Optionally, in the above combustion chamber volume detection method, obtaining the three-dimensional model of the combustion chamber corresponding to the piston to be measured of the engine to be measured includes:

[0027] Obtaining an image of the object to be detected, where the image of the object to be detected is an image obtained by an image acquisition device collecting an image of the piston in the cylinder bore of the engine to be measured along the Z-axis direction, and the Z-axis is the central axis of the piston;

[0028] Generating a three-dimensional point cloud based on the image of the object to be detected;

[0029] Optimizing the three-dimensional point cloud to form a three-dimensional model of the combustion chamber with the top surface of the cylinder block as the reference plane.

[0030] Optionally, in the above combustion chamber volume detection method, after calculating the combustion chamber volume, it further includes:

[0031] Calculating the difference between the calculated combustion chamber volume and the standard combustion chamber volume, and determining whether the difference is within a preset tolerance range. When it is within the preset tolerance range, outputting a prompt message indicating that the combustion chamber volume is qualified; otherwise, outputting a prompt message indicating that the combustion chamber volume is unqualified.

[0032] Optionally, in the above combustion chamber volume detection method, before determining whether the difference is within the preset tolerance range, it further includes:

[0033] Obtaining the model identification of the engine to be detected or the equipment identification of the equipment to which the engine is applied;

[0034] Obtaining the corresponding preset tolerance range based on the model identification or the equipment identification.

[0035] Optionally, in the above combustion chamber volume detection method, after calculating the height difference between the top surface of the piston and the top surface of the engine cylinder block based on the model, it further includes:

[0036] Determine whether the height difference is within a preset height difference range. When the height difference is not within the preset height difference range, output a prompt message for prompting the user to adjust the crankshaft angle. When the height difference is within the preset height difference range, continue to execute the subsequent steps.

[0037] The second aspect of the present application provides a combustion chamber volume detection device, including:

[0038] A volume acquisition unit for acquiring a first part volume and a second part volume. The first part volume is the volume of the part where the piston protrudes from the top surface of the engine cylinder block, and the second part volume is the volume of the combustion chamber part formed by the plane where the cylinder hole is located and the concave part of the piston top.

[0039] A compensation amount acquisition unit for determining a first volume compensation amount.

[0040] A combustion chamber volume calculation unit for calculating the combustion chamber volume based on the first part volume, the second part volume, and the first volume compensation amount.

[0041] The third aspect of the present application provides a computer program product, including computer-readable instructions. When the computer-readable instructions run on an electronic device, the electronic device is enabled to implement the combustion chamber volume detection method of the first aspect or any implementation manner of the first aspect.

[0042] The fourth aspect of the present application provides an electronic device, including at least one processor and a memory connected to the processor, wherein:

[0043] The memory is used for storing a computer program;

[0044] The processor is used for executing the computer program so that the electronic device can implement the combustion chamber volume detection method of the first aspect or any implementation manner of the first aspect.

[0045] The fifth aspect of the present application provides a computer storage medium. The storage medium 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 combustion chamber volume detection method of the first aspect or any implementation manner of the first aspect.

[0046] With the above technical solution, for the above solution provided by this application, first, the volume of the first part and the volume of the second part are obtained. The volume of the first part is the volume of the part where the piston protrudes above the top surface of the engine cylinder block, and the volume of the second part is the volume of the combustion chamber part formed by the plane where the cylinder bore is located and the concave part of the piston top. Then, the volume compensation amount is determined, and the combustion chamber volume is calculated based on the volume of the first part, the volume of the second part, and the first volume compensation amount. Compared with the traditional titration method, there is no need to drip liquid, and the measurement of the combustion chamber volume can be carried out quickly and cleanly, and the consistency of the measurement results is relatively high. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In combination with the accompanying drawings and with reference to the following specific embodiments, the above and other features, advantages, and aspects of the various embodiments of the present disclosure will become more apparent. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the original components and elements are not necessarily drawn to scale.

[0048] Figure 1 is a schematic structural diagram of a piston head;

[0049] Figure 2 is the detection application scenario of the combustion chamber volume detection solution disclosed in this application;

[0050] Figure 3 is a system architecture framework diagram of applying the combustion chamber volume detection method disclosed in this application;

[0051] Figure 4 is an optional hardware structure diagram of the terminal 100 disclosed in an embodiment of this application;

[0052] Figure 5 is an optional hardware structure diagram of the server 200 disclosed in an embodiment of this application;

[0053] Figure 6 is a flowchart of the combustion chamber volume detection method disclosed in an embodiment of this application;

[0054] Figure 7 is an image of the object to be detected collected by the image acquisition device;

[0055] Figure 8 For Figure 7 is a schematic diagram of the three-dimensional point cloud obtained by resolving the image;

[0056] Figure 9 Based on Figure 8 is a schematic diagram of the three-dimensional model of the combustion chamber constructed based on the three-dimensional point cloud;

[0057] Figure 10 Schematic diagram of the positions of the first part, the second part, and the third part in this application;

[0058] Figure 11 Schematic structural diagram of a combustion chamber volume detection device provided by an embodiment of the present application;

[0059] Figure 12 Schematic structural diagram of an electronic device disclosed by an embodiment of the present application. Detailed implementation manners

[0060] The embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application. The terms used in the implementation part of the present application are only used to explain the specific embodiments of the present application, rather than intended to limit the present application.

[0061] The embodiments of the present application will be described below with reference to the accompanying drawings. Those skilled in the art know that with the development of technology and the emergence of new scenarios, the technical solutions provided by the embodiments of the present application are equally applicable to similar technical problems.

[0062] The terms "first", "second", etc. in the specification, claims and above-mentioned drawings of the present application are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances, which is only a way of distinguishing when describing objects with the same attributes in the embodiments of the present application. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion, so that a process, method, system, product or device comprising a series of units does not have to be limited to those units, but may include other units not clearly listed or inherent to these process, method, product or device.

[0063] Figure 1 Schematic structural diagram of the piston head to be detected in the present application, Figure 1 In which, 110 is the inner wall formed on the inner side of the piston head, and 111 is the protruding part on the piston top.

[0064] Figure 2 Schematic diagram of the detection scenario of the combustion chamber volume detection solution disclosed by the present application, where, Figure 2 In which, 1 is the gantry, 2 is the walking guide rail, 3 is the image acquisition device, 4 is the cylinder of the engine to be measured, and 5 is the piston hole on the cylinder of the engine to be measured. The image acquisition device 3 can walk freely on the gantry 1, and the cylinder 4 of the engine to be measured can walk freely on the walking guide rail 2. During volume detection, the acquisition direction of the image acquisition device is directly opposite to the center of the piston hole. After one piston hole is detected, move the cylinder of the engine to be measured so that the next piston hole is directly opposite to the image acquisition device, and continue to detect the next piston hole.

[0065] The combustion chamber volume detection method provided by this application can be applied to, for example, Figure 3 the system architecture shown in the figure. This system may include a terminal 100 and a server 200. The server 200 may include one or more servers ( Figure 3 In the figure, it is illustrated by taking one server as an example).

[0066] Both the terminal 100 and the server 200 can be used alone to execute the combustion chamber volume detection method provided by the embodiments of this application. The terminal 110 and the server 120 can also be used in cooperation to execute the combustion chamber volume detection method provided in the embodiments of this application.

[0067] Next, the product form of the terminal 100 will be described Figure 1 in the figure;

[0068] The terminal 100 in the embodiments of this application can be a mobile phone, a tablet computer, a wearable device, a vehicle-mounted device, a conference terminal, an augmented reality (AR) / virtual reality (VR) device, a notebook computer, an ultra-mobile personal computer (UMPC), a netbook, a personal digital assistant (PDA), etc. The embodiments of this application do not impose any restrictions on this.

[0069] Figure 4 shows an optional schematic diagram of the hardware structure of the terminal 100.

[0070] Referring to Figure 4 shown in the figure, the terminal 100 may include a radio frequency unit 110, a memory 120, an input unit 130, a display unit 140 (optional), a camera 150 (optional), an audio circuit 160 (optional), a speaker 161 (optional), a microphone 162 (optional), a headphone jack 163 (optional), a processor 170, an external interface 180, a power supply 190, and other components. Those skilled in the art can understand that Figure 2 This is merely an example of a terminal or a multifunctional device, and does not constitute a limitation on the terminal or the multifunctional device. It may include more or fewer components than those shown in the figure, or combine certain components, or different components.

[0071] The input unit 130 can be used to receive input information and generate key signal inputs related to the user settings and function controls of the portable multifunctional device. Specifically, the input unit 130 can include a touch screen 131 (optional) and / or other input devices 132. The touch screen 131 can collect touch operations of the user on or near it (such as operations of the user using any suitable object such as a finger, joint, stylus, etc. on or near the touch screen), and drive the corresponding connection device according to a preset program. The touch screen can detect the touch actions of the user on the touch screen, convert the touch actions into touch signals and send them to the processor 170, and can receive and execute the commands sent by the processor 170; the touch signals at least include contact coordinate information. The touch screen 131 can provide an input interface and an output interface between the terminal 100 and the user. In addition, various types such as resistive, capacitive, infrared, and surface acoustic wave can be used to implement the touch screen. In addition to the touch screen 131, the input unit 130 can also include other input devices. Specifically, the other input devices 132 can include, but are not limited to, one or more of a physical keyboard, function keys (such as volume control keys, power on / off keys, etc.), trackballs, mice, joysticks, etc.

[0072] Among them, the input device 132 can receive input data, etc.

[0073] The display unit 140 can be used to display information input by the user or information provided to the user, various menus of the terminal 100, interactive interfaces, file displays, and / or the playback of any multimedia file. In the embodiments of the present application, the display unit 140 can be used to display an interface for detecting the combustion chamber volume, a three-dimensional model, a detection result, etc.

[0074] The memory 120 can be used to store instructions and data. The memory 120 mainly includes a storage instruction area and a storage data area. The storage data area can store various data, such as multimedia files, texts, etc.; the storage instruction area can store software units such as an operating system, applications, instructions required for at least one function, etc., or their subsets or extended sets. It can also include a non-volatile random access memory; it provides the processor 170 with management of the hardware, software, and data resources in the computing processing device, supports control software and applications. It is also used for the storage of multimedia files and the storage of running programs and applications.

[0075] The processor 170 is the control center of the terminal 100, connecting various parts of the entire terminal 100 through various interfaces and lines. By running or executing instructions stored in the memory 120 and invoking data stored in the memory 120, it performs various functions of the terminal 100 and processes data, thereby exercising overall control over the terminal device. Optionally, the processor 170 may include one or more processing units; preferably, the processor 170 may integrate an application processor and a modem processor. Among them, the application processor mainly processes the operating system, user interface, application programs, etc., and the modem processor mainly processes wireless communications. It can be understood that the above-mentioned modem processor may not be integrated into the processor 170 either. In some embodiments, the processor and the memory may be implemented on a single chip, and in some embodiments, they may also be separately implemented on independent chips. The processor 170 can also be used to generate corresponding operation control signals, send them to corresponding components of the computing and processing device, read and process data in the software, especially read and process the data and programs in the memory 120, so that each functional module therein executes corresponding functions, thereby controlling the corresponding components to act according to the requirements of the instructions.

[0076] Among them, the memory 120 can be used to store software codes related to the combustion chamber volume detection method. The processor 170 can execute the steps of the combustion chamber volume detection method or can also schedule other units (such as the above-mentioned input unit 130 and display unit 140) to implement corresponding functions.

[0077] The radio frequency unit 110 (optional) can be used for receiving and transmitting signals during the information receiving and transmitting process. For example, after receiving the downlink information of the base station, it is sent to the processor 170 for processing; in addition, the designed uplink data is sent to the base station. Generally, the RF circuit includes but is not limited to antennas, at least one amplifier, a transceiver, a coupler, a low noise amplifier (LNA), a duplexer, etc. In addition, the radio frequency unit 110 can also communicate with network devices and other devices through wireless communication. This wireless communication can use any communication standard or protocol, including but not limited to Global System of Mobile communication (GSM), General Packet Radio Service (GPRS), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), Long Term Evolution (LTE), email, Short Messaging Service (SMS), etc.

[0078] It should be understood that the radio frequency unit 110 is optional and can be replaced by other communication interfaces, such as a network interface.

[0079] The terminal 100 also includes a power supply 190 (such as a battery) for powering each component. Preferably, the power supply can be logically connected to the processor 170 through a power management system, so as to realize functions such as management of charging, discharging, and power consumption management through the power management system.

[0080] The terminal 100 also includes an external interface 180. This external interface can be a standard Micro USB interface or a multi-pin connector, which can be used to connect the terminal 100 to other devices for communication and can also be used to connect a charger to charge the terminal 100.

[0081] Although not shown, the terminal 100 may also include a flash, a wireless fidelity (WiFi) module, a Bluetooth module, sensors with different functions, etc., which will not be elaborated here. Some or all of the methods described below can be applied to the terminal 100 as Figure 3 shown.

[0082] Next, the product form of the server 200 will be described; Figure 3 in

[0083] Figure 5A schematic structural diagram of a server 200 is provided, as Figure 5 shown. The server 200 includes a bus 201, a processor 202, a communication interface 203, and a memory 204. The processor 202, the memory 204, and the communication interface 203 communicate with each other through the bus 201.

[0084] The bus 201 can be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For the sake of easy representation, Figure 5 only one line is used to represent it in the figure, but it does not mean that there is only one bus or one type of bus.

[0085] The processor 202 can be any one or more of a central processing unit (CPU), a graphics processing unit (GPU), a microprocessor (MP), or a digital signal processor (DSP), etc.

[0086] The memory 204 can include volatile memory, such as random access memory (RAM). The memory 204 can also include non-volatile memory, such as read-only memory (ROM), flash memory, a hard disk drive (HDD), or a solid state drive (SSD).

[0087] Among them, the memory 204 can be used to store software codes related to the combustion chamber volume detection method, and the processor 202 can execute the steps of the combustion chamber volume detection method or can also schedule other units to implement corresponding functions.

[0088] It should be understood that the above terminal 100 and server 200 can be centralized or distributed devices, and the processors in the above terminal 100 and server 200 (such as processor 170 and processor 202) can be hardware circuits (such as application specific integrated circuit (ASIC), field-programmable gate array (FPGA), general-purpose processor, digital signal processor (DSP), microprocessor or microcontroller, etc.), or a combination of these hardware circuits. For example, the processor can be a hardware system with the function of executing instructions, such as CPU, DSP, etc., or a hardware system without the function of executing instructions, such as ASIC, FPGA, etc., or a combination of the above hardware systems without the function of executing instructions and hardware systems with the function of executing instructions.

[0089] To solve the above problems proposed in the background art, an embodiment of the present application provides a method for detecting the combustion chamber volume. The method for detecting the combustion chamber volume in the embodiment of the present application will be introduced in detail below with reference to the accompanying drawings.

[0090] Taking this method as an example applied to Figure 4 the computer device in, the computer device can specifically be the terminal 100 or the server 200 in the above figure. Referring to Figure 6 , the method for detecting the combustion chamber volume specifically includes the following steps:

[0091] Step S110: Obtain the first part volume and the second part volume.

[0092] In this embodiment, at least a part of the piston top of the piston to be measured protrudes from the engine cylinder bore. The reason for at least a part of the piston top of the piston to be measured protruding from the engine cylinder bore is to make the position of the piston near the top dead center during detection. When the piston is near the top dead center, a part of the area on the piston top will protrude from the cylinder block top surface.

[0093] Taking the top surface of the cylinder block of the piston to be measured as the boundary, the combustion chamber is divided into two parts, that is, the first part and the second part. The first part is located above the reference plane, and the second part is located below the reference plane. That is, the first part is the part where the piston protrudes from the top surface of the engine cylinder block, and the second part is the part of the combustion chamber formed by the depression between the cylinder bore and the piston top inside the top surface of the engine cylinder block (referring to the side of the depression area on the top surface of the cylinder block facing the piston); then calculate the volumes of the first part and the second part, see Figure 10 , in this solution, the calculated volume of the first part is denoted as V up, denote the calculated second - part volume as V down .

[0094] In this embodiment, in order to obtain the first - part volume and the second - part volume more quickly, a three - dimensional model of the combustion chamber corresponding to the piston to be measured of the engine to be measured can be obtained in advance.

[0095] The combustion chamber is an important area of the engine. When the piston is at the top dead center, the space formed above the piston top surface and below the cylinder head bottom surface is called the combustion chamber. The combustion chamber is mainly divided into three types, namely, hemispherical, wedge - shaped and basin - shaped. In this solution, in order to quickly detect the combustion chamber volume, a three - dimensional model of the combustion chamber corresponding to the piston to be measured can be constructed first, and then the combustion chamber volume can be calculated by analyzing the three - dimensional model.

[0096] In this solution, the three - dimensional model of the combustion chamber can be constructed by using preset software according to the image of the object to be monitored collected by the image acquisition device. The image of the object to be detected is an image obtained by the image acquisition device (the image acquisition device can be an optical camera) collecting the image of the piston in the cylinder bore of the engine to be measured along the Z - axis direction. The Z - axis is the central axis of the piston. After the system applying this method obtains the image of the object to be detected, it triggers the preset software to solve the image of the object to be detected, obtains the corresponding three - dimensional point cloud, and then optimizes the three - dimensional point cloud to construct a three - dimensional model of the combustion chamber with the top surface of the cylinder block as the reference plane. For example, the preset software can be VGAGE. The image of the object to be detected collected by the image acquisition device can be as Figure 7 shown, and the three - dimensional point cloud obtained by solving Figure 7 can be as Figure 8 shown, and the three - dimensional model of the combustion chamber constructed based on the three - dimensional point cloud is as Figure 9 shown.

[0097] When calculating the first - part volume V up and the volume V down of the second part based on the three - dimensional model, it can be realized by using the pre - loaded volume analysis software.

[0098] In this solution, when dividing the combustion chamber into a first part and a second part based on the three - dimensional model, it is divided with the reference plane of the three - dimensional model as the boundary. The reference plane refers to the top surface of the cylinder block in the three - dimensional model. The system applying this method can automatically identify the reference plane of the three - dimensional model through a preset algorithm, or can also identify the reference plane of the three - dimensional model based on the user - marked result.

[0099] Step S120: Determine the first volume compensation amount.

[0100] The volume compensation amount refers to the volume between the top surface of the piston of the engine to be measured and the top surface of the engine block.

[0101] To quickly calculate the magnitude of the first volume compensation amount, in this application, the height difference between the top surface of the piston and the top surface of the engine block can be calculated based on the three-dimensional model, and then the first volume compensation amount can be calculated based on the height difference and the cylinder bore size. Specifically, the cross-sectional area of the cylinder bore is calculated based on the cylinder bore size, and the product of the cross-sectional area and the height difference is the first volume compensation amount.

[0102] When calculating the first volume compensation amount based on the three-dimensional model, the system applying this method automatically measures the height difference h between the top surface of the piston and the top surface of the engine block in the three-dimensional model, and then based on the pre-configured cylinder bore size D of the engine block cylinder (which can refer to the bore diameter of the piston hole), the volume between the top surface of the piston and the top surface of the engine block can be calculated, and this part of the volume is denoted as the first volume compensation amount V h , the first volume compensation amount V h is the volume compensation amount corresponding to the sinking of h after the piston reaches the top dead center.

[0103] Of course, in an ideal situation, when measuring the combustion chamber volume, the piston can be directly placed at the top dead center position. Since when the piston reaches the top dead center, the top surface of the piston protrudes above the upper plane of the cylinder block, the formed combustion chamber volume is too small to be measured. Therefore, to improve the accuracy of the measurement results, the piston needs to be sunk by a certain height h to make the measured volume value larger and improve the measurement accuracy. At this time, the volume of the sinking area is V h , and when calculating the actual combustion chamber volume, it needs to be subtracted. In this solution, the sinking height h of the piston can be configured according to design requirements as long as at least part of the area of the top of the piston to be measured protrudes from the engine cylinder bore. For example, in this embodiment, the value of h can be about 1 mm.

[0104] Step S130: Calculate the combustion chamber volume based on the first part of the volume, the second part of the volume, and the first volume compensation amount.

[0105] In this step, the difference between the second part of the volume and the difference between the first part of the volume and the first volume compensation amount can be used as the combustion chamber volume corresponding to the measured piston.

[0106] Specifically, after calculating the first part of the volume V up , the second part of the volume V down , and the first volume compensation amount V h , based on the formula V combustion chamber = V down - Vup -V h Calculate the combustion chamber volume V combustion chamber .

[0107] As can be seen from the above solution, for the solution disclosed in this embodiment, first, the position of the piston under test is adjusted so that at least part of the piston top surface of the piston under test protrudes from the engine cylinder bore. Then, the volume of the part of the piston protruding from the top surface of the engine block (the first part of the volume), the volume of the combustion chamber part formed by the plane where the cylinder bore is located and the concave part of the piston top surface (the second part of the volume), and the volume compensation amount are obtained in sequence. Finally, the combustion chamber volume is calculated from the first part of the volume, the second part of the volume, and the first volume compensation amount. Compared with the traditional titration method, the solution disclosed in this application does not require injecting liquid into the piston hole, can achieve fast and clean measurement of the combustion chamber volume, and has a high consistency of measurement results.

[0108] When measuring the combustion chamber volume based on a 3D model, obtain the 3D model of the combustion chamber corresponding to the piston under test in the current state. Taking the top surface of the engine block in the 3D model as the boundary, record the volume of the part of the piston protruding from the top surface of the engine block as the first part of the volume, and record the volume of the combustion chamber part formed by the cylinder bore within the top surface of the engine block and the concave part of the piston top surface as the second part of the volume. Then, measure the height difference between the top surface of the piston and the top surface of the engine block based on the 3D model, calculate the first volume compensation amount based on the height difference and the cylinder diameter size, and then take the difference between the second part of the volume and the sum of the first part of the volume and the first volume compensation amount as the combustion chamber volume corresponding to the measured piston. Compared with the traditional titration method, for the solution disclosed in this application, the user participation is less, and most of the calculation processes can be automatically executed by the system, and the combustion chamber volume corresponding to the piston under test can be calculated quickly and efficiently.

[0109] Furthermore, considering that traditional optical measurement schemes can only measure the combustion chamber volume under static assembly, and the measured object requires no narrow and deep gaps (the gap between the piston and the piston hole) where light cannot refract. This application takes into account that the height of the piston fluctuates in the assembled state, the volume values vary greatly at different heights, and the optical scanner cannot scan the gap between the piston and the inner wall of the cylinder bore. By setting the clearance volume compensation amount, after calculating the combustion chamber volume, the clearance volume compensation amount between the piston and the cylinder block is determined, and then the calculated combustion chamber volume is compensated with the clearance volume compensation amount, so that the measurement result of the combustion chamber volume is more accurate. Among them, the combustion chamber volume is positively correlated with the diameter of the piston and the piston fire deck height (the piston fire deck height refers to the distance from the piston top to the first ring groove). The larger the diameter of the piston and the piston fire deck height, the larger the corresponding clearance volume compensation amount. This application can pre-add the mapping relationship between the diameter of the piston, the piston fire deck height and the clearance volume compensation amount to a preset mapping table. After determining the piston diameter and the piston fire deck height based on the three-dimensional model, the corresponding clearance volume compensation amount can be determined by looking up the table in the preset mapping table, and then the combustion chamber volume is compensated with the clearance volume compensation amount to obtain the combustion chamber volume corresponding to the current piston state. Further, the mapping relationship between the diameter of the piston, the piston fire deck height and the clearance volume compensation amount can be: V clearance =[π×(D cylinder / 2)² - π×(D piston / 2) 2 ×h piston , where D cylinder represents the piston diameter, h piston represents the piston fire deck height, and V clearance represents the clearance volume compensation amount. Based on this formula, the clearance volume compensation amount corresponding to any piston diameter and piston fire deck height can be calculated, and these corresponding relationships are written into the preset mapping table. Of course, on the basis of not considering the computing resources of the system applying this method, the system applying this method can also directly calculate the clearance volume compensation amount corresponding to the measured piston in the current state based on the formula V clearance =[π×(D cylinder / 2)² - π×(D piston / 2) 2 ×h piston . Among them, the piston fire deck height h piston and the piston diameter D cylinder can both be obtained by analyzing the three-dimensional model.

[0110] Further, in this embodiment, after calculating the combustion chamber volume, the calculated combustion chamber volume can be compared with the standard combustion chamber volume to determine whether the calculated combustion chamber volume is qualified. If it is qualified, the measurement of the next cylinder can be continued. If it is unqualified, it indicates that there is a problem with this cylinder and requires further inspection by the designer. Specifically, after calculating the combustion chamber volume in the above method, it can further include: calculating the difference between the calculated combustion chamber volume and the standard combustion chamber volume, and determining whether the difference is within a preset tolerance range. When it is within the preset tolerance range, a prompt message indicating that the combustion chamber volume is qualified is output. Otherwise, a prompt message indicating that the combustion chamber volume is unqualified is output.

[0111] Further, due to different engine models and different precision requirements of the application object for the engine, the value of the preset tolerance range can be different. For example, in the case where the precision requirement for some engines is relatively low or the precision requirement for the engine application object is relatively low, the preset tolerance range can be set larger, while for those with higher precision requirements, the corresponding preset tolerance range can be set smaller. Therefore, the present application can dynamically adjust the preset tolerance range according to the precision requirements of the engine or its application equipment. In this solution, the model identification of the engine and the equipment identification of the equipment applied by the engine can indicate the precision requirements of the engine and its application equipment to a certain extent. Therefore, the present application can pre - establish a mapping relationship between the model identification of the engine or the equipment identification of the equipment applied by the engine and the preset tolerance range. Before determining whether the difference is within the preset tolerance range, first obtain the model identification of the engine to be detected or the equipment identification of the equipment applied by the engine; then obtain the corresponding preset tolerance range based on the model identification or the equipment identification.

[0112] In the technical solution disclosed in this embodiment, by setting a reasonable height difference h between the piston top surface and the engine block top surface, the reliability of the measurement result can be ensured. If the height difference h is set too large or too small, the accuracy of the measurement result will be affected. Therefore, in order to ensure the accuracy of the measurement result, after calculating the height difference, it is pre - judged whether the height difference is within a reasonable range. If it is within the preset height difference range, it indicates that the detection can continue with the subsequent steps. Otherwise, a prompt message for prompting the user to adjust the crankshaft angle is output. After the user adjusts the crankshaft, the detection method disclosed in the present application is re - executed.

[0113] Further, in the technical solution disclosed in the embodiments of the present application, in order to facilitate the traceability of test data, in the technical solution disclosed in this embodiment, relevant data in the combustion chamber volume detection process can be bound to the object to be measured, and the binding result can be stored. The relevant data in the detection process may include the image of the monitored object, the three-dimensional model, the volume of the first part, the volume of the second part, the first volume compensation amount, the clearance volume compensation amount, and the combustion chamber volume. These data are bound to the model identification of the object to be measured, and the binding result is stored in the memory. When data needs to be traced, the data can be extracted from the memory.

[0114] After verification by the applicant, the combustion chamber volume detection method disclosed in the present application has the following advantages compared with the existing titration method:

[0115] 1) Shorter detection time and higher detection efficiency. The detection time for a single combustion chamber by the titration method is about 5 minutes, while the detection time of this solution is about 10 seconds.

[0116] 2) Better operation convenience. The titration method can only be manually operated and has complex steps. While this solution can be semi-automated (only manual loading and unloading) or fully automated.

[0117] 3) Better data traceability. The titration method generally records data manually, while this solution can automatically upload data to the system and bind it to the object to be measured.

[0118] 4) Better repeat measurement accuracy. The titration method is limited by the measurement personnel's technique, and the deviation of repeated measurements is relatively large, greater than 0.1 ml, while the repeated measurement accuracy of this solution can be less than 0.05 ml.

[0119] 5) Cleaner measurement. The titration method generally uses kerosene for measurement, and there will be kerosene residues on the part surface after measurement, which affects the cleanliness of the part. While this solution does not require the assistance of other media and has no impact on the cleanliness of the part.

[0120] The above introduces a combustion chamber volume detection method provided by the embodiments of the present application. The following will introduce the device for performing the above combustion chamber volume detection method.

[0121] Please refer to Figure 11 , Figure 11 which is a schematic structural diagram of a combustion chamber volume detection device provided by the embodiments of the present application. As Figure 7 shown, the combustion chamber volume detection device includes:

[0122] A volume acquisition unit 10, configured to acquire the volume of the first part and the volume of the second part. The volume of the first part is the volume of the part where the piston protrudes from the top surface of the engine cylinder block, and the volume of the second part is the volume of the combustion chamber part formed by the plane where the cylinder hole is located and the concave part of the piston top;

[0123] A compensation amount acquisition unit 20 for determining a first volume compensation amount;

[0124] A combustion chamber volume calculation unit 30 for calculating a combustion chamber volume based on the first partial volume, the second partial volume, and the first volume compensation amount.

[0125] Corresponding to the above method, the above device may further include a model construction unit for obtaining a three-dimensional model of a combustion chamber corresponding to a measured piston of a measured engine, and at least a partial area of the piston top of the measured piston protrudes from the engine cylinder bore.

[0126] For the specific implementation processes and principles of the volume acquisition unit 10, the compensation amount acquisition unit 20, and the combustion chamber volume calculation unit 30, please refer to the above method embodiments and will not be elaborated here.

[0127] In a possible implementation, an electronic device is further provided in an embodiment of the present application. Refer to Figure 12 As shown, it shows a schematic structural diagram of an electronic device suitable for implementing the electronic device in 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 smart phones, laptop computers, PDAs (Personal Digital Assistants), PADs (Tablet Computers), desktop computers, and the like. Figure 12 The electronic device shown is only an example and should not bring any limitation to the functions and usage scopes of the embodiments of the present application.

[0128] As Figure 12 shown, the electronic device may include a processing device (such as a central processing unit, a graphics processing unit, etc.) 601, which may perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 602 or a program loaded from a storage device 608 into a random access memory (RAM) 603. When the electronic device is powered on, various programs and data required for the operation of the electronic device are also stored in the RAM 603. The processing device 601, the ROM 602, and the RAM 603 are connected to each other through a bus 604. An input / output (I / O) interface 605 is also connected to the bus 604.

[0129] Generally, the following devices may be connected to the I / O interface 605: an input device 606 including, for example, a touch screen, a touchpad, 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 wiredly to exchange data. Although Figure 11An electronic device having various devices is shown, but it should be understood that it is not required to implement or have all the shown devices. Instead, more or fewer devices may be implemented or had.

[0130] An embodiment of the present application also provides a computer program product including computer-readable instructions that, when run on an electronic device, cause the electronic device to implement any one of the combustion chamber volume detection methods provided by the embodiments of the present application.

[0131] An embodiment of the present application also provides a computer-readable storage medium that carries one or more computer programs, and when the one or more computer programs are executed by an electronic device, the electronic device can be caused to implement any one of the combustion chamber volume detection methods provided by the embodiments of the present application.

[0132] In addition, it should be noted that the device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, in the drawings of the device embodiments provided in the present application, the connection relationship between the modules indicates that they have a communication connection, which can be specifically implemented as one or more communication buses or signal lines.

[0133] Through the description of the above embodiments, those skilled in the art 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 dedicated hardware including application-specific integrated circuits, dedicated CPUs, dedicated memories, dedicated components, etc. Generally, functions completed by computer programs can be easily implemented by corresponding hardware, and the specific hardware structures for implementing the same function can also be various, such as analog circuits, digital circuits or dedicated circuits. However, for the present application, in more cases, software program implementation is a better implementation method. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a readable storage medium, such as a floppy disk, USB flash drive, mobile hard disk, ROM, RAM, magnetic disk or optical disc of a computer, and includes several instructions to cause a computer device (which can be a personal computer, training device, or network device, etc.) to execute the methods described in various embodiments of the present application.

[0134] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product.

[0135] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. 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 a website, a computer, a training device, or a data center to another website, a computer, a training device, or a data center by wire (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that a computer can store or a data storage device such as a training device or a data center that includes one or more integrated available media. The available medium may be a magnetic medium (such as a floppy disk, a hard disk, a magnetic tape), an optical medium (such as a DVD), or a semiconductor medium (such as a solid state disk (SSD)).

Claims

1. A method for detecting the volume of a combustion chamber, characterized in that: include: Obtaining a first partial volume and a second partial volume, wherein the first partial volume is the volume of a portion of the piston protruding from a top surface of an engine cylinder block, and the second partial volume is the volume of a combustion chamber portion formed by a plane where the cylinder hole is located and a recessed portion of a piston top; determining a first volume compensation amount; The combustion chamber volume is calculated based on the first partial volume, the second partial volume, and the first volume compensation amount.

2. The combustion chamber volume detection method according to claim 1, characterized in that: Acquiring the first partial volume and the second partial volume includes: Acquire a three-dimensional model of a combustion chamber corresponding to a tested piston of a tested engine, wherein at least a portion of a piston top of the tested piston protrudes out of a cylinder bore of the engine; Based on the three-dimensional model, a first partial volume and a second partial volume are calculated.

3. The combustion chamber volume detection method according to claim 2, characterized in that: The determining of the first volume compensation amount includes: A height difference between a top surface of the piston and a top surface of the engine cylinder block is calculated based on the three-dimensional model, and a first volume compensation amount is calculated based on the height difference and a cylinder diameter.

4. The combustion chamber volume detection method according to claim 3, characterized in that: The combustion chamber volume is calculated based on the first partial volume, the second partial volume and the first volume compensation amount, including: Based on the formula V combustion chamber =V down -V up -V h Calculate the combustion chamber volume V combustion chamber , wherein the V up is the volume of the first part, the V down is the volume of the second part, V h is the first volume compensation amount.

5. The combustion chamber volume detection method according to claim 1, characterized in that: After the combustion chamber volume is calculated, it also includes: A clearance volume compensation amount between the piston and the cylinder body is determined, and the clearance volume compensation amount is used to compensate the combustion chamber volume.

6. The combustion chamber volume detection method according to claim 5, characterized in that: Before compensating the combustion chamber volume by using the clearance volume compensation amount, the method further includes: Based on the formula V clearance =[π×(D cylinder / 2)2-π×(D piston / 2) 2 ]×h piston Calculate the clearance volume compensation V between the piston and the cylinder clearance ; Among them, D cylinder Indicates the piston diameter, h piston Indicates the height of the piston fire shore.

7. The combustion chamber volume detection method according to claim 2, characterized in that: The step of obtaining a three-dimensional model of a combustion chamber corresponding to a tested piston of the tested engine includes: Acquire an image of the object to be detected, wherein the image of the object to be detected is an image obtained by an image acquisition device acquiring an image of a piston in a cylinder hole of an engine to be detected along a Z-axis direction, wherein the Z-axis is a central axis of the piston; generating a three-dimensional point cloud based on the image of the detected object; The three-dimensional point cloud is optimized to form a three-dimensional model of the combustion chamber with the cylinder top surface as the reference plane.

8. The combustion chamber volume detection method according to claim 1, characterized in that: After the combustion chamber volume is calculated, it also includes: The difference between the calculated combustion chamber volume and the standard combustion chamber volume is used to determine whether the difference is within a preset tolerance range. When it is within the preset tolerance range, a prompt message is output to indicate that the combustion chamber volume is qualified; otherwise, a prompt message is output to indicate that the combustion chamber volume is unqualified.

9. The combustion chamber volume detection method according to claim 8, characterized in that: Before determining whether the difference is within a preset tolerance range, the method further includes: Obtaining a model identification of the engine being tested or a device identification of a device to which the engine is applied; A corresponding preset tolerance range is obtained based on the model identifier or the device identifier.

10. The combustion chamber volume detection method according to claim 3, characterized in that: After calculating the height difference between the top surface of the piston and the top surface of the engine cylinder block based on the model, the method further includes: Determine whether the height difference is within a preset height difference range. When the height difference is not within the preset height difference range, output a prompt message to prompt the user to adjust the crankshaft angle. When the height difference is within the preset height difference range, continue to execute subsequent steps.

11. A combustion chamber volume detection device, characterized in that: include: A volume acquisition unit, used to acquire a first partial volume and a second partial volume, wherein the first partial volume is the volume of a portion of the piston protruding from a top surface of an engine cylinder block, and the second partial volume is the volume of a combustion chamber portion formed by a plane where the cylinder hole is located and a recessed portion of a piston top; A compensation amount obtaining unit, used for determining a first volume compensation amount; The combustion chamber volume calculation unit is used to calculate the combustion chamber volume based on the first partial volume, the second partial volume and the first volume compensation amount.

12. 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 combustion chamber volume detection method as claimed in any one of claims 1 to 10.

13. An electronic 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 combustion chamber volume detection method as described in any one of claims 1 to 10.

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