CN117168722A - Automobile engine cylinder body air tightness detection method and system - Google Patents
Automobile engine cylinder body air tightness detection method and system Download PDFInfo
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Abstract
The invention provides a method and a system for detecting the air tightness of an automobile engine cylinder body, which relate to the technical field of data processing, wherein a pressurization detection module of a pressurization parameter control detection device is used for carrying out pressurization treatment on the cylinder body through a detection interface to obtain pressure change time sequence information, and the air tightness information is obtained according to the pressure change time sequence information and a temperature change detection module is activated; carrying out temperature change treatment on the cylinder body by adopting temperature change parameters; the interactive temperature change detection module obtains a temperature change image set to perform temperature change analysis, and obtains the coordinates of the air leakage point. The technical problems that in the prior art, the detection of the air tightness defect of the cylinder of the automobile engine and the behavior of the leakage point are both dependent on subjective experience of maintenance personnel, so that the positioning accuracy and the positioning efficiency of the air tightness defect site of the cylinder are low are solved. The technical effects of improving cylinder body air tightness defect judgment and accurate positioning efficiency of the engine cylinder and reducing the dependence of cylinder body air tightness defect detection judgment on manpower are achieved.
Description
Technical Field
The invention relates to the technical field of data processing, in particular to a method and a system for detecting the air tightness of an automobile engine cylinder body.
Background
In the current automotive repair field, the detection and leakage points of the air tightness defect of an engine cylinder still depend on subjective experience of maintenance personnel. When an automobile maintenance technician detects the air tightness of an engine cylinder, the automobile maintenance technician relies on own experience and feeling to judge possible leakage points, and when repairing is carried out, the positions of the leakage points cannot be accurately determined due to the influence of subjective factors, so that the repairing effect is not ideal or multiple attempts are required.
The risk of such an empirical detection method is that it may lead to a lower accuracy and efficiency of locating the air tightness defect site of the cylinder and even secondary damage to the engine cylinder.
Disclosure of Invention
The application provides a method and a system for detecting the air tightness of an automobile engine cylinder body, which are used for solving the technical problems that in the prior art, the air tightness defect site positioning accuracy and positioning efficiency of an air cylinder are low because the detection of the air tightness defect of the automobile engine cylinder and the behavior of a leakage point depend on subjective experience of maintenance personnel.
In view of the above problems, the application provides a method and a system for detecting the air tightness of an automobile engine cylinder body.
In a first aspect of the present application, there is provided a method for detecting air tightness of an engine block of an automobile, the method comprising: the method comprises the steps of interacting target design information, wherein the target design information specifically comprises target air inlet parameters of a target cylinder body, target cylinder body volume and target working temperature; obtaining target configuration information, wherein the target configuration information comprises target pressurization parameters, a target detection interface and target temperature change parameters, wherein the target pressurization parameters are determined according to target cylinder volume analysis, the target detection interface is determined according to target air inlet parameter analysis, and the target temperature change parameters are determined according to target working temperature analysis; the pressurizing detection module of the target detection device is controlled by adopting the target pressurizing parameter to carry out pressurizing treatment on the target cylinder body through the target detection interface; obtaining target pressure change time sequence information, wherein the target pressure change time sequence information is obtained by interaction with the pressure detection module; inputting the target pressure change time sequence information into a pre-constructed airtight performance analysis module to obtain target airtight performance information, and activating the temperature change detection module based on the target airtight performance information; the temperature change detection module of the target detection device is controlled by adopting the target temperature change parameter to perform temperature change treatment on the target cylinder body through the target detection interface; and the temperature change detection module is interacted to obtain a temperature change image set, and temperature change analysis is carried out on the temperature change image set to obtain the target air leakage point coordinates.
In a second aspect of the present application, there is provided an automobile engine block air tightness detection system, the system comprising: the design information acquisition unit is used for interacting target design information, wherein the target design information specifically comprises target air inlet parameters, target cylinder volume and target working temperature of a target cylinder; the configuration information obtaining unit is used for obtaining target configuration information, wherein the target configuration information comprises target pressurization parameters, a target detection interface and target temperature change parameters, the target pressurization parameters are determined according to target cylinder volume analysis, the target detection interface is determined according to target air inlet parameter analysis, and the target temperature change parameters are determined according to target working temperature analysis; a pressurization processing execution unit for controlling the pressurization detection module of the target detection device to perform pressurization processing on the target cylinder body via the target detection interface by adopting the target pressurization parameter; the pressure change time sequence obtaining unit is used for obtaining target pressure change time sequence information, wherein the target pressure change time sequence information is obtained by interaction with the pressure detection module; the temperature change detection activation unit is used for inputting the target pressure change time sequence information into a pre-constructed airtight performance analysis module, obtaining target airtight performance information and activating the temperature change detection module based on the target airtight performance information; the temperature change processing execution unit is used for controlling the temperature change detection module of the target detection device to perform temperature change processing on the target cylinder body through the target detection interface by adopting the target temperature change parameters; wen Bianfen analysis execution unit, which is used to interact the temperature change detection module to obtain a temperature change image set, and to perform temperature change analysis on the temperature change image set to obtain the target leakage point coordinates.
One or more technical schemes provided by the application have at least the following technical effects or advantages:
the method provided by the embodiment of the application comprises the steps of exchanging target design information, wherein the target design information specifically comprises target air inlet parameters, target cylinder volume and target working temperature of a target cylinder; obtaining target configuration information, wherein the target configuration information comprises target pressurization parameters, a target detection interface and target temperature change parameters, wherein the target pressurization parameters are determined according to target cylinder volume analysis, the target detection interface is determined according to target air inlet parameter analysis, and the target temperature change parameters are determined according to target working temperature analysis; the pressurizing detection module of the target detection device is controlled by adopting the target pressurizing parameter to carry out pressurizing treatment on the target cylinder body through the target detection interface; obtaining target pressure change time sequence information, wherein the target pressure change time sequence information is obtained by interaction with the pressure detection module; inputting the target pressure change time sequence information into a pre-constructed airtight performance analysis module to obtain target airtight performance information, and activating the temperature change detection module based on the target airtight performance information; the temperature change detection module of the target detection device is controlled by adopting the target temperature change parameter to perform temperature change treatment on the target cylinder body through the target detection interface; and the temperature change detection module is interacted to obtain a temperature change image set, and temperature change analysis is carried out on the temperature change image set to obtain the target air leakage point coordinates. The technical effects of improving cylinder body air tightness defect judgment and accurate positioning efficiency of the engine cylinder and reducing the dependence of cylinder body air tightness defect detection judgment on manpower are achieved.
Drawings
FIG. 1 is a schematic flow chart of a method for detecting the air tightness of an automobile engine cylinder body;
FIG. 2 is a schematic flow chart of obtaining target configuration information in the method for detecting the air tightness of an automobile engine cylinder body;
FIG. 3 is a schematic flow chart of performance judgment of a cylinder in the method for detecting the air tightness of an automobile engine cylinder;
fig. 4 is a schematic structural diagram of the air tightness detection system for the cylinder block of the automobile engine.
Reference numerals illustrate: a design information obtaining unit 1, a configuration information obtaining unit 2, a pressurization processing executing unit 3, a pressure change time sequence obtaining unit 4, a temperature change detection activating unit 5, a temperature change processing executing unit 6, wen Bianfen analysis executing unit 7.
Detailed Description
The application provides a method and a system for detecting the air tightness of an automobile engine cylinder body, which are used for solving the technical problems that in the prior art, the air tightness defect site positioning accuracy and positioning efficiency of an air cylinder are low because the detection of the air tightness defect of the automobile engine cylinder and the behavior of a leakage point depend on subjective experience of maintenance personnel. The technical effects of improving cylinder body air tightness defect judgment and accurate positioning efficiency of the engine cylinder and reducing the dependence of cylinder body air tightness defect detection judgment on manpower are achieved.
The technical scheme of the application accords with related regulations on data acquisition, storage, use, processing and the like.
In the following, the technical solutions of the present application will be clearly and completely described with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present application, but not all embodiments of the present application, and that the present application is not limited by the exemplary embodiments described herein. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application. It should be further noted that, for convenience of description, only some, but not all of the drawings related to the present application are shown.
Example 1
As shown in fig. 1, the present application provides a method for detecting air tightness of an automobile engine block, the method is applied to an air tightness detection system of an automobile engine block, the air tightness detection system of the automobile engine block is in communication connection with a target detection device, the target detection device comprises a pressurization detection module and a temperature change detection module, and the method comprises:
a100, interacting target design information, wherein the target design information specifically comprises target air inlet parameters, target cylinder volume and target working temperature of a target cylinder;
Specifically, in this embodiment, the target cylinder is a cylinder of an automobile engine applied to an unspecified fuel vehicle, and the target design information is directly obtained by interaction between manufacturers of the target cylinder, where the target design information specifically includes the target cylinder volume (L) representing a volume of the target cylinder, the target operating temperature representing an operating temperature range expected by the target cylinder in design, and the target intake port parameter representing a diameter or an area of an intake port of the target cylinder.
The purpose of obtaining the target design information in this embodiment is to provide a reference for setting detection parameters for accurate detection of airtight defects of the target cylinder under the premise of no irreversible damage to the target cylinder.
A200, obtaining target configuration information, wherein the target configuration information comprises target pressurization parameters, a target detection interface and target temperature change parameters, wherein the target pressurization parameters are determined according to target cylinder volume analysis, the target detection interface is determined according to target air inlet parameter analysis, and the target temperature change parameters are determined according to target working temperature analysis;
In one embodiment, as shown in fig. 2, target configuration information is obtained, where the target configuration information includes a target pressurization parameter, a target detection interface, and a target temperature change parameter, and the method step a200 provided in the present application further includes:
a210, the target detection device is provided with K alternative detection interfaces and a target pressurizing cavity;
a220, carrying out data call according to the K alternative detection interfaces to obtain K interface parameter information;
a230, taking the target air inlet parameter as constraint, referring to the K interface parameter information, and performing interface matching in the K alternative detection interfaces to obtain the target detection interface;
a240, connecting the target cylinder body and the target pressurizing cavity by adopting the target detection interface;
a250, interactively obtaining a target usage scene of the target cylinder, inputting the volume of the target cylinder and the target usage scene into a pre-constructed pressurizing analysis sub-network, analyzing a pressurizing limit value, and outputting the target pressurizing parameter;
and A260, presetting a temperature division constraint, traversing the target working temperature based on the temperature division constraint, and obtaining N-level temperature control parameters, wherein the N-level temperature control parameters form the target temperature change parameters.
In one embodiment, the method includes the steps of interactively obtaining a target usage scenario of the target cylinder, inputting the target cylinder volume and the target usage scenario into a pre-constructed pressurization analysis sub-network, performing pressurization limit analysis, and outputting a target pressurization parameter, where the method step a250 further includes:
a251, acquiring a plurality of groups of sample engine parameters, wherein each group of sample engine parameters comprises a sample volume parameter, a sample combustion efficiency and a sample air compression ratio;
a252, constructing the pressurized analysis sub-network based on a knowledge graph, and filling data of the pressurized analysis sub-network by adopting the plurality of groups of sample engine parameters;
a253, obtaining target combustion efficiency according to the target use scene, and inputting the pressurized analysis sub-network to perform data matching based on the target combustion efficiency and the target cylinder volume to obtain a target air compression ratio;
and A254, calculating according to the target air compression ratio to obtain the target pressurization parameter.
Specifically, in this embodiment, the method is applied to an automobile engine cylinder air tightness detection system, the automobile engine cylinder air tightness detection system is in communication connection with a target detection device, the target detection device specifically includes a pressurizing cavity and a detection interface, the pressurizing cavity is connected with an air inlet of a target cylinder after being connected with the detection interface, and an air outlet of the target cylinder is sealed in advance.
The pressurizing cavity has a second function, wherein the first function is used for buffering air flow entering the target cylinder body, so that the air flow entering the target cylinder body is ensured to be stable, and the second function is used for indirectly determining whether the target cylinder body has air tightness defects or not by detecting the air pressure change condition in the pressurizing cavity. This example will be described in detail in the following description as a method for measuring the air pressure in the target pressurizing chamber.
Because of the differences in the size designs of the air inlets of the different engine cylinders, the target detection device in the embodiment is provided with K alternative detection interfaces so as to meet the air tightness detection requirements of the different cylinders.
And carrying out data call according to the K alternative detection interfaces to obtain K interface parameter information, wherein the interface parameter is interface diameter or area information, the target air inlet parameter is taken as constraint, the K interface parameter information is referred to, interface matching is carried out in the K alternative detection interfaces to obtain the target detection interface, the target detection interface is an interface with consistency with the target air inlet parameter, and the target detection interface is adopted to connect the target cylinder body and the target pressurizing cavity.
And when the target cylinder body is inflated to preliminarily judge whether the target cylinder body has the air tightness defect, the pressurization detection module is adopted, and the control parameter setting method of the pressurization detection module is as follows.
The cylinder products designed and sold by different automobile manufacturers and cylinder manufacturers are interacted to obtain the multiple groups of sample engine parameters, each group of sample engine parameters comprises a sample volume parameter, sample combustion efficiency and a sample air compression ratio, wherein the air compression ratio is the ratio of the cylinder volume in a final compression state to the cylinder volume in a starting compression state. The combustion efficiency is the percentage of chemical energy released by the fuel in the combustion process in the cylinder to be converted into effective work.
And constructing the pressurizing analysis sub-network based on a knowledge graph, and adopting the plurality of groups of sample engine parameters to carry out data filling of the pressurizing analysis sub-network, wherein the combustion efficiency is taken as a first attribute, the plurality of sample combustion efficiencies are taken as a first attribute value, the volume parameter is taken as a second attribute, the plurality of sample volume parameters are taken as a second attribute value, the air compression ratio is taken as a third attribute, and the plurality of sample air compression ratios are taken as a third attribute value.
The target use scene is the automobile engine matched with the target cylinder body, and the combustion efficiency parameter at the beginning of the design of the automobile engine is obtained according to the target use scene and is used as the target combustion efficiency.
And inputting the target combustion efficiency and the target cylinder volume into the pressurizing analysis sub-network for data matching, and obtaining a sample air compression ratio of which the value of the sample combustion efficiency and the value of the sample cylinder volume are completely consistent with the values of the target combustion efficiency and the target cylinder volume as the target air compression ratio.
Obtaining the internal air pressure of the target cylinder body in a compressed air state under the condition of the target air compression ratio according to the target air compression ratio, further obtaining the normal pressure air volume of the target cylinder body which needs to be filled into the target cylinder body when the target cylinder body is in an uncompressed state according to the internal air pressure calculation, further obtaining the normal pressure air volume of the target pressurizing cavity which needs to be filled into the target cylinder body when the target cylinder body is in an uncompressed state by adopting the same method, adding the internal air pressure of the target cylinder body and the normal pressure air volume to obtain the target pressurizing parameter, wherein the target pressurizing parameter is the total ram air charging volume.
Based on the step S100, the target working temperature is a temperature interval of safe operation of the target cylinder in a use state, a temperature division constraint is preset, the target working temperature is divided based on the temperature division constraint, and an N-level temperature control parameter is obtained, wherein the N-level temperature control parameter forms the target temperature change parameter.
Exemplary target working temperatures are 150-250 ℃, the temperature division constraint is 50 ℃, and the N-set temperature control parameters are three-level, specifically including 150 ℃, 200 ℃ and 250 ℃.
The embodiment obtains the target pressurization parameter and the target temperature change parameter to effectively locate the leakage point of the target cylinder and provide the technical effect of scientific test data on the premise of ensuring that the airtight performance test does not cause irreversible damage to the target cylinder.
A300, adopting the target pressurization parameter to control the pressurization detection module of the target detection device to carry out pressurization treatment on the target cylinder body through the target detection interface;
a400, obtaining target pressure change time sequence information, wherein the target pressure change time sequence information is obtained by interaction with the pressure detection module;
specifically, in this embodiment, the target pressurizing cavity is a regular sphere, the sensor layout scheme is preferably that a connection direction of the target pressurizing cavity and the target detecting interface is taken as a polar axis of the target pressurizing cavity, the polar axis is equally divided into four sections, warp threads at a segmented node of the polar axis are obtained, 4 circles of warp threads are supplied and obtained, further, sensor equal distribution is performed on the 4 circles of warp threads, and K pressure sensors are distributed in the target pressurizing cavity. And the pressurization detection module controls normal-temperature air to carry out pressurization treatment on the target cylinder body through the target pressurization cavity and the target detection interface according to the target pressurization parameter.
A pressure threshold value is preset, which is preferably the internal air pressure of the target cylinder at the target air compression ratio. And controlling the pressurization detection module of the target detection device by adopting the target pressurization parameters to carry out pressurization treatment on the target cylinder body through the target detection interface, and stopping air filling by the pressurization detection module when the pressure values obtained by the K pressure sensors monitoring the target pressurization cavity are all larger than the preset pressure threshold value.
Simultaneously, the K pressure sensors start to record pressure data in real time, K groups of pressure change time sequence information representing the time-varying conditions of air pressure at K positions in a target pressurizing cavity are obtained, and the K groups of pressure change time sequence information form the target pressure change time sequence information.
A500, inputting the target pressure change time sequence information into a pre-constructed airtight performance analysis module to obtain target airtight performance information, and activating the temperature change detection module based on the target airtight performance information;
in one embodiment, the target voltage variation time sequence information is input into a pre-built airtight performance analysis module to obtain target airtight performance information, and before the method step a500 provided by the present application further includes:
A511, presetting a sensor layout scheme, and carrying out pressure sensor layout in the target pressurizing cavity based on the sensor layout scheme, wherein K pressure sensors are arranged in the target pressurizing cavity;
a512, the pressurization detection module controls normal-temperature air to carry out pressurization treatment on the target cylinder body through the target pressurization cavity and the target detection interface according to the target pressurization parameters;
and A513, presetting a pressure threshold, and recording pressure data in real time when the pressure values obtained by the K pressure sensors monitoring the target pressurizing cavity are larger than the preset pressure threshold to obtain K groups of pressure change time sequence information, wherein the K groups of pressure change time sequence information form the target pressure change time sequence information.
In one embodiment, the target voltage variation time sequence information is input into a pre-built airtight performance analysis module to obtain target airtight performance information, and the method step A500 provided by the application further comprises:
a521, the airtight performance analysis module comprises an airtight fluctuation analysis sub-module and a performance judgment sub-module;
a522, constructing a pressure fluctuation calculation formula, wherein the pressure fluctuation calculation formula is as follows:
wherein,for pressure fluctuation parameters >Is->Weight of group pressure change time sequence information, +.>Is->Mean value of group pressure change time sequence information, +.>Is->Any pressure data in the group pressure change time sequence information;
a523, constructing and generating the airtight fluctuation analysis submodule based on the pressure fluctuation calculation formula;
a524, presetting a qualified airtight threshold value, and synchronizing the qualified airtight threshold value to the performance judging sub-module;
a525, inputting the target pressure change time sequence information into the airtight fluctuation analysis sub-module of the airtight performance analysis module to obtain a target fluctuation parameter;
a526, judging whether the target fluctuation parameter meets the qualified airtight threshold based on the performance judging submodule;
and A527, if the target fluctuation parameter does not meet the qualified airtight threshold value, obtaining the target airtight performance information.
Specifically, in this embodiment, the target pressure-change time sequence information is input to a pre-built airtight performance analysis module to obtain target airtight performance information, where the target airtight performance information includes two types, one type is that there is an airtight performance defect, and the other type is that there is no airtight performance defect, and the target airtight performance information is more general, and then the accurate positioning of the airtight leakage point needs to be performed through a temperature-change detection module.
The airtight performance analysis module comprises an airtight fluctuation analysis sub-module and a performance judgment sub-module, and the airtight fluctuation analysis sub-module calculates pressure fluctuation conditions according to the target pressure change time sequence information obtained in the earlier stage.
Specifically, a pressure fluctuation calculation formula is constructed, and the pressure fluctuation calculation formula is as follows:
wherein,for pressure fluctuation parameters>Is->Weight of group pressure change time sequence information, +.>Is->Mean value of group pressure change time sequence information, +.>Is->And (5) any pressure data in the group pressure change time sequence information.
Grouping the K pressure sensors according to the line where the pressure sensor is located, and further distributing weight parameters according to the distance between the line where the pressure sensor is located and the target detection interface, so as to obtain K weights of the K pressure sensors。
And constructing and generating the airtight fluctuation analysis submodule based on the pressure fluctuation calculation formula. And presetting a qualified airtight threshold, wherein the qualified airtight threshold can be set according to the specific condition of the target cylinder body, and the numerical value of the qualified airtight threshold is not forcedly limited and is synchronized to the performance judging sub-module.
Inputting the target pressure change time sequence information into the airtight fluctuation analysis sub-module of the airtight performance analysis module to perform pressure fluctuation calculation to obtain a target fluctuation parameter, and judging whether the target fluctuation parameter meets the qualified airtight threshold value or not based on the performance judgment sub-module; and if the target fluctuation parameter does not meet the qualified airtight threshold value, obtaining the target airtight performance information with airtight performance defects as a result.
According to the embodiment, by constructing the pressure fluctuation calculation formula and the airtight performance analysis module, the technical effect that whether the airtight defect exists in the target cylinder body can be scientifically judged under the condition that the target pressure change time sequence information is obtained is achieved.
A600, adopting the target temperature change parameter to control the temperature change detection module of the target detection device to perform temperature change treatment on the target cylinder body through the target detection interface;
specifically, in this embodiment, the pressurization detection module is configured to preliminarily determine whether the target cylinder has an air tightness defect, and the temperature change detection module is configured to further perform detection and positioning of the leakage point after the pressurization detection module determines that the target cylinder has the air tightness defect.
Specifically, the temperature change detection module heats the normal-temperature air according to the N-level temperature control parameters in the target temperature change parameters and heats the target cylinder body for multiple times through the target detection interface so as to change the temperature inside the target cylinder body.
Meanwhile, the control duration of the N-level temperature control parameters is preset, for example, the duration of normal-temperature air heating and injection into the target cylinder body is 10 minutes.
And carrying out multiple heating of the target cylinder based on the N-level temperature control parameters, and carrying out panoramic image acquisition of the target cylinder by adopting an infrared camera at a heating control duration ending node to obtain an N Zhang Gangti apparent infrared image corresponding to the N-level temperature control parameters, wherein the N Zhang Gangti apparent infrared image forms the temperature change image set, and the temperature change image set is used for subsequently shrinking the leakage position of the target cylinder.
A700, the temperature change detection module is interacted to obtain a temperature change image set, and temperature change analysis is carried out on the temperature change image set to obtain the target leakage point coordinates.
In one embodiment, the temperature change detection module is interacted to obtain a temperature change image set, and the temperature change image set is subjected to temperature change analysis to obtain the target air leakage point coordinates, and the method step A700 provided by the application further comprises the following steps:
a710, the temperature change image set comprises N cylinder apparent infrared images, wherein the N Zhang Gangti apparent infrared images are mapped in association with the N-level temperature control parameters;
a720, interactively obtaining a repair size parameter, and generating an image segmentation threshold according to the repair size parameter;
a730, presetting an image segmentation frequency, and carrying out image segmentation on the N Zhang Gangti apparent infrared image according to the image segmentation frequency based on the image segmentation threshold value to obtain N groups of segmentation temperature change image sets;
a740, carrying out temperature deviation calculation on the N groups of segmented temperature change image sets to obtain N temperature deviation parameter sets;
a750, serializing the N temperature deviation parameter sets to obtain N temperature deviation extreme values and N temperature deviation limit areas;
and A760, performing intersection processing on the N temperature deviation limit areas to obtain a target leakage area, and taking the coordinates of the target leakage area as the coordinates of the target leakage point.
Specifically, in the present embodiment, the temperature-change image set includes the N Zhang Gangti apparent infrared image mapped in association with the N-level temperature control parameter.
And the repair size parameter is the minimum area of a leakage repair area when the cylinder leaks, a repair square area is fitted according to the repair size parameter, and the length and the width of the repair square area are used as the image segmentation threshold.
Because the method for determining the leakage position based on the analysis of the apparent infrared image of each cylinder body is the same, the principle is that the apparent leakage point temperature of the cylinder body is larger than that of the apparent areas of other cylinder bodies, and correspondingly, in the infrared image, the RGB value of the leakage point area is different from that of the apparent areas of other cylinder bodies, so that the embodiment randomly selects the apparent infrared image of the first cylinder body based on the apparent infrared image N Zhang Gangti, and the detailed explanation of the technical scheme is carried out by positioning the leakage point of the apparent infrared image of the first cylinder body.
Specifically, the image segmentation frequency is preset, for example, H times, and the image segmentation of the image segmentation frequency is performed on the apparent infrared image of the first cylinder based on the image segmentation threshold value to obtain an H-group segmentation temperature-change image set, and it should be noted that, when the image gridding segmentation is performed each time, the relative angles of the grid and the apparent image of the first cylinder are different, so that the H-group segmentation temperature-change image set with the grids not overlapping with each other is obtained.
Presetting an RGB value change interval, calling to obtain a first group of divided temperature change image set based on the H group of divided temperature change image set, further obtaining RGB values of all pixels of each divided temperature change image in the first group of divided temperature change image set, further adopting a pixel RGB value addition and serialization method to obtain an RGB maximum pixel and an RGB minimum pixel of each divided temperature change image, further obtaining RGB deviation values (namely temperature deviation parameters) of each divided temperature change image, further serializing each divided temperature change image in the first group of divided temperature change image set according to the RGB deviation values, obtaining a divided temperature change image with the maximum RGB deviation value, and taking the region as a leakage point region.
The same method is adopted to obtain H segmentation temperature change images with the largest RGB deviation values of the H segmentation temperature change image sets, intersection processing is carried out on the segmentation temperature change images with the largest H RGB deviation values to obtain a first temperature deviation limit area, and average value calculation is carried out on RGB values corresponding to the segmentation temperature change images with the largest H RGB deviation values to serve as first temperature deviation parameters of the first temperature deviation limit area.
Adopting the same method for obtaining a first temperature deviation limit region and a first temperature deviation parameter of a first cylinder apparent image, and carrying out temperature deviation calculation on the N groups of segmented temperature change image sets to obtain N temperature deviation extreme values and N temperature deviation limit regions;
And carrying out intersection processing on the N temperature deviation limit areas to obtain a target leakage area, and further taking the coordinates of the target leakage area as the coordinates of the target leakage point.
According to the embodiment, the target cylinder body is subjected to multi-stage temperature change treatment, and the apparent temperature change image of the cylinder body subjected to multi-stage temperature change treatment is subjected to multi-angle gridding treatment, so that the area with the leakage problem of the target cylinder body is accurately positioned, the dependence of the cylinder body air tightness defect positioning on the experience of maintenance personnel is reduced, and the technical effect of improving the cylinder body air tightness defect positioning efficiency is achieved.
In one embodiment, as shown in fig. 3, the method steps provided by the present application further include:
a810, performing performance optimization on the target cylinder body according to the target air leakage point coordinates to obtain a target optimized cylinder body;
a820, performing operation test of the target optimized cylinder body by adopting the target usage scene to obtain actual combustion efficiency;
a830, generating a combustion efficiency deviation index according to the actual combustion efficiency and the target combustion efficiency;
a840, presetting a discard threshold, judging whether the combustion efficiency deviation index meets the discard threshold, and if the combustion efficiency deviation index meets the discard threshold, generating a discard label;
And A850, marking the target optimization cylinder body by adopting the scrapped label.
Specifically, in this embodiment, the target leakage point coordinates are sent to a cylinder maintenance person, and the cylinder maintenance person refers to the target leakage point coordinates to perform leakage repair on the target cylinder body, so as to complete cylinder performance optimization, and obtain the target optimized cylinder body without air tightness defect.
And reinstalling the target optimized cylinder body into an engine of an original automobile corresponding to the target use scene, simulating engine working conditions to perform operation test of the target optimized cylinder body, and acquiring parameters of combustion efficiency in the operation process by adopting professional combustion efficiency testing equipment such as a gas analyzer or an exhaust gas analyzer to obtain the actual combustion efficiency.
Generating a combustion efficiency deviation index according to the actual combustion efficiency and the target combustion efficiency, wherein the combustion efficiency deviation index is obtained by taking the actual combustion efficiency as a molecule and the target combustion efficiency is obtained by calculating the molecule.
The scrapping threshold is a cost deviation percentage obtained by comprehensively using the fuel consumption of the target cylinder body from the continuous use of the target cylinder body to the specified scrapping time of the current time node and the current direct replacement cost of the target cylinder body.
Judging whether the combustion efficiency deviation index meets the rejection threshold, if so, generating a rejection label, and marking the target optimized cylinder body by adopting the rejection label so as to prompt an automobile repair person to replace the target cylinder body in a subsequent repair process.
The embodiment achieves the technical effects of judging whether the cylinder is scrapped or not according to the performance condition of the repaired cylinder, avoiding the occurrence of the event of rising of the use cost of the actual automobile caused by the reduction of the service performance when the air tightness performance of the repaired cylinder reaches the standard, and maintaining the rights and interests of consumers.
Example two
Based on the same inventive concept as the method for detecting the air tightness of the cylinder block of the automobile engine in the foregoing embodiments, as shown in fig. 4, the present application provides an air tightness detection system of the cylinder block of the automobile engine, wherein the system comprises:
a design information obtaining unit 1, configured to interact with target design information, where the target design information specifically includes a target air inlet parameter of a target cylinder, a target cylinder volume, and a target working temperature;
a configuration information obtaining unit 2, configured to obtain target configuration information, where the target configuration information includes a target pressurization parameter, a target detection interface, and a target temperature change parameter, where the target pressurization parameter is determined according to the target cylinder volume analysis, the target detection interface is determined according to the target air inlet parameter analysis, and the target temperature change parameter is determined according to the target working temperature analysis;
A pressurization processing execution unit 3 for controlling the pressurization detection module of the target detection device to perform pressurization processing on the target cylinder via the target detection interface by using the target pressurization parameter;
a pressure change timing sequence obtaining unit 4, configured to obtain target pressure change timing sequence information, where the target pressure change timing sequence information is obtained by interaction with the pressurization detection module;
a temperature change detection activation unit 5, configured to input the target pressure change timing information into a pre-constructed airtight performance analysis module, obtain target airtight performance information, and activate the temperature change detection module based on the target airtight performance information;
a temperature change processing execution unit 6, configured to control the temperature change detection module of the target detection device to perform temperature change processing on the target cylinder body via the target detection interface by using the target temperature change parameter;
wen Bianfen analysis execution unit 7, configured to interact the temperature change detection module to obtain a temperature change image set, and perform temperature change analysis on the temperature change image set to obtain a target air leakage point coordinate.
In one embodiment, the configuration information obtaining unit 2 further includes:
the target detection device is provided with K alternative detection interfaces and a target pressurizing cavity;
Carrying out data call according to the K alternative detection interfaces to obtain K interface parameter information;
taking the target air inlet parameter as constraint, referring to the K interface parameter information, and performing interface matching in the K alternative detection interfaces to obtain the target detection interface;
the target cylinder body is connected with the target pressurizing cavity by adopting the target detection interface;
the target usage scene of the target cylinder body is obtained in an interactive mode, the target cylinder body volume and the target usage scene are input into a pre-built pressurizing analysis sub-network, pressurizing limit value analysis is conducted, and the target pressurizing parameters are output;
presetting a temperature division constraint, traversing the target working temperature based on the temperature division constraint, and obtaining N-level temperature control parameters, wherein the N-level temperature control parameters form the target temperature change parameters.
In one embodiment, the configuration information obtaining unit 2 further includes:
acquiring a plurality of groups of sample engine parameters, wherein each group of sample engine parameters comprises a sample volume parameter, a sample combustion efficiency and a sample air compression ratio;
constructing the pressurized analysis sub-network based on a knowledge graph, and filling data of the pressurized analysis sub-network by adopting the plurality of groups of sample engine parameters;
Obtaining target combustion efficiency according to the target use scene, inputting the target combustion efficiency and the target cylinder volume into the pressurizing analysis sub-network for data matching based on the target combustion efficiency and the target cylinder volume, and obtaining a target air compression ratio;
and calculating according to the target air compression ratio to obtain the target pressurization parameter.
In one embodiment, the temperature change detection activation unit 5 further includes:
presetting a sensor layout scheme, and carrying out pressure sensor layout in the target pressurizing cavity based on the sensor layout scheme, wherein K pressure sensors are arranged in the target pressurizing cavity;
the pressurization detection module controls normal-temperature air to carry out pressurization treatment on the target cylinder body through the target pressurization cavity and the target detection interface according to the target pressurization parameter;
and presetting a pressure threshold, and recording pressure data in real time when the pressure values obtained by the K pressure sensors monitoring the target pressurizing cavity are larger than the preset pressure threshold to obtain K groups of pressure change time sequence information, wherein the K groups of pressure change time sequence information form the target pressure change time sequence information.
In one embodiment, the temperature change detection activation unit 5 further includes:
The airtight performance analysis module comprises an airtight fluctuation analysis sub-module and a performance judgment sub-module;
construction of pressure wavesA dynamic calculation formula, wherein the pressure fluctuation calculation formula is as follows:
wherein,for pressure fluctuation parameters>Is->Weight of group pressure change time sequence information, +.>Is->Mean value of group pressure change time sequence information, +.>Is->Any pressure data in the group pressure change time sequence information;
constructing and generating the airtight fluctuation analysis submodule based on the pressure fluctuation calculation formula;
presetting a qualified airtight threshold value, and synchronizing the qualified airtight threshold value to the performance judging submodule;
inputting the target pressure change time sequence information into the airtight fluctuation analysis sub-module of the airtight performance analysis module to obtain a target fluctuation parameter;
judging whether the target fluctuation parameter meets the qualified airtight threshold based on the performance judging submodule;
and if the target fluctuation parameter does not meet the qualified airtight threshold value, obtaining the target airtight performance information.
In one embodiment, the Wen Bianfen analysis execution unit 7 further includes:
the temperature change image set comprises N cylinder apparent infrared images, wherein the N Zhang Gangti apparent infrared images are mapped in association with the N-level temperature control parameters;
Interactively obtaining a repair size parameter, and generating an image segmentation threshold according to the repair size parameter;
presetting an image segmentation frequency, and carrying out image segmentation on the N Zhang Gangti apparent infrared image according to the image segmentation frequency based on the image segmentation threshold value to obtain N groups of segmentation temperature change image sets;
carrying out temperature deviation calculation on the N groups of segmented temperature change image sets to obtain N temperature deviation parameter sets;
serializing the N temperature deviation parameter sets to obtain N temperature deviation extreme values and N temperature deviation limit areas;
and carrying out intersection processing on the N temperature deviation limit areas to obtain a target leakage area, and taking the coordinates of the target leakage area as the coordinates of the target leakage point.
In one embodiment, the Wen Bianfen analysis execution unit 7 further includes:
performing performance optimization on the target cylinder body according to the target air leakage point coordinates to obtain a target optimized cylinder body;
performing operation test of the target optimizing cylinder body by adopting the target using scene to obtain actual combustion efficiency;
generating a combustion efficiency deviation index according to the actual combustion efficiency and the target combustion efficiency;
presetting a discard threshold, judging whether the combustion efficiency deviation index meets the discard threshold, and if the combustion efficiency deviation index meets the discard threshold, generating a discard label;
And marking the target optimization cylinder body by adopting the scrapped label.
Any of the methods or steps described above may be stored as computer instructions or programs in various non-limiting types of computer memories, and identified by various non-limiting types of computer processors, thereby implementing any of the methods or steps described above.
Based on the above-mentioned embodiments of the present invention, any improvements and modifications to the present invention without departing from the principles of the present invention should fall within the scope of the present invention.
Claims (8)
1. The method is applied to an automobile engine cylinder body air tightness detection system which is in communication connection with a target detection device, wherein the target detection device comprises a pressurization detection module and a temperature change detection module, and the method comprises the following steps:
the method comprises the steps of interacting target design information, wherein the target design information specifically comprises target air inlet parameters of a target cylinder body, target cylinder body volume and target working temperature;
obtaining target configuration information, wherein the target configuration information comprises target pressurization parameters, a target detection interface and target temperature change parameters, wherein the target pressurization parameters are determined according to target cylinder volume analysis, the target detection interface is determined according to target air inlet parameter analysis, and the target temperature change parameters are determined according to target working temperature analysis;
The pressurizing detection module of the target detection device is controlled by adopting the target pressurizing parameter to carry out pressurizing treatment on the target cylinder body through the target detection interface;
obtaining target pressure change time sequence information, wherein the target pressure change time sequence information is obtained by interaction with the pressure detection module;
inputting the target pressure change time sequence information into a pre-constructed airtight performance analysis module to obtain target airtight performance information, and activating the temperature change detection module based on the target airtight performance information;
the temperature change detection module of the target detection device is controlled by adopting the target temperature change parameter to perform temperature change treatment on the target cylinder body through the target detection interface;
and the temperature change detection module is interacted to obtain a temperature change image set, and temperature change analysis is carried out on the temperature change image set to obtain the target air leakage point coordinates.
2. The method of claim 1, wherein target configuration information is obtained, wherein the target configuration information includes a target pressurization parameter, a target detection interface, and a target temperature change parameter, the method further comprising:
the target detection device is provided with K alternative detection interfaces and a target pressurizing cavity;
Carrying out data call according to the K alternative detection interfaces to obtain K interface parameter information;
taking the target air inlet parameter as constraint, referring to the K interface parameter information, and performing interface matching in the K alternative detection interfaces to obtain the target detection interface;
the target cylinder body is connected with the target pressurizing cavity by adopting the target detection interface;
the target usage scene of the target cylinder body is obtained in an interactive mode, the target cylinder body volume and the target usage scene are input into a pre-built pressurizing analysis sub-network, pressurizing limit value analysis is conducted, and the target pressurizing parameters are output;
presetting a temperature division constraint, traversing the target working temperature based on the temperature division constraint, and obtaining N-level temperature control parameters, wherein the N-level temperature control parameters form the target temperature change parameters.
3. The method of claim 2, wherein the target usage scenario for the target cylinder is obtained interactively, and the target cylinder volume and the target usage scenario are input into a pre-built pressurization analysis sub-network for pressurization limit analysis, and target pressurization parameters are output, the method further comprising:
acquiring a plurality of groups of sample engine parameters, wherein each group of sample engine parameters comprises a sample volume parameter, a sample combustion efficiency and a sample air compression ratio;
Constructing the pressurized analysis sub-network based on a knowledge graph, and filling data of the pressurized analysis sub-network by adopting the plurality of groups of sample engine parameters;
obtaining target combustion efficiency according to the target use scene, inputting the target combustion efficiency and the target cylinder volume into the pressurizing analysis sub-network for data matching based on the target combustion efficiency and the target cylinder volume, and obtaining a target air compression ratio;
and calculating according to the target air compression ratio to obtain the target pressurization parameter.
4. The method of claim 2, wherein the target pressure change timing information is input to a pre-built air tightness analysis module to obtain target air tightness information, and wherein the method further comprises, before:
presetting a sensor layout scheme, and carrying out pressure sensor layout in the target pressurizing cavity based on the sensor layout scheme, wherein K pressure sensors are arranged in the target pressurizing cavity;
the pressurization detection module controls normal-temperature air to carry out pressurization treatment on the target cylinder body through the target pressurization cavity and the target detection interface according to the target pressurization parameter;
and presetting a pressure threshold, and recording pressure data in real time when the pressure values obtained by the K pressure sensors monitoring the target pressurizing cavity are larger than the preset pressure threshold to obtain K groups of pressure change time sequence information, wherein the K groups of pressure change time sequence information form the target pressure change time sequence information.
5. The method of claim 4, wherein the target pressure change timing information is input to a pre-built air tightness performance analysis module to obtain target air tightness performance information, the method further comprising:
the airtight performance analysis module comprises an airtight fluctuation analysis sub-module and a performance judgment sub-module;
constructing a pressure fluctuation calculation formula, wherein the pressure fluctuation calculation formula is as follows:
wherein,for pressure fluctuation parameters>Is->Weight of group pressure change time sequence information, +.>Is->Mean value of group pressure change time sequence information, +.>Is->Any pressure data in the group pressure change time sequence information;
constructing and generating the airtight fluctuation analysis submodule based on the pressure fluctuation calculation formula;
presetting a qualified airtight threshold value, and synchronizing the qualified airtight threshold value to the performance judging submodule;
inputting the target pressure change time sequence information into the airtight fluctuation analysis sub-module of the airtight performance analysis module to obtain a target fluctuation parameter;
judging whether the target fluctuation parameter meets the qualified airtight threshold based on the performance judging submodule;
and if the target fluctuation parameter does not meet the qualified airtight threshold value, obtaining the target airtight performance information.
6. The method of claim 2, wherein the temperature change detection module is interacted with to obtain a set of temperature change images, the set of temperature change images is subjected to temperature change analysis to obtain target leak point coordinates, the method further comprising:
the temperature change image set comprises N cylinder apparent infrared images, wherein the N Zhang Gangti apparent infrared images are mapped in association with the N-level temperature control parameters;
interactively obtaining a repair size parameter, and generating an image segmentation threshold according to the repair size parameter;
presetting an image segmentation frequency, and carrying out image segmentation on the N Zhang Gangti apparent infrared image according to the image segmentation frequency based on the image segmentation threshold value to obtain N groups of segmentation temperature change image sets;
carrying out temperature deviation calculation on the N groups of segmented temperature change image sets to obtain N temperature deviation parameter sets;
serializing the N temperature deviation parameter sets to obtain N temperature deviation extreme values and N temperature deviation limit areas;
and carrying out intersection processing on the N temperature deviation limit areas to obtain a target leakage area, and taking the coordinates of the target leakage area as the coordinates of the target leakage point.
7. A method as claimed in claim 3, wherein the method further comprises:
Performing performance optimization on the target cylinder body according to the target air leakage point coordinates to obtain a target optimized cylinder body;
performing operation test of the target optimizing cylinder body by adopting the target using scene to obtain actual combustion efficiency;
generating a combustion efficiency deviation index according to the actual combustion efficiency and the target combustion efficiency;
presetting a discard threshold, judging whether the combustion efficiency deviation index meets the discard threshold, and if the combustion efficiency deviation index meets the discard threshold, generating a discard label;
and marking the target optimization cylinder body by adopting the scrapped label.
8. Automobile engine cylinder block gas tightness detecting system, characterized in that it comprises:
the design information acquisition unit is used for interacting target design information, wherein the target design information specifically comprises target air inlet parameters, target cylinder volume and target working temperature of a target cylinder;
the configuration information obtaining unit is used for obtaining target configuration information, wherein the target configuration information comprises target pressurization parameters, a target detection interface and target temperature change parameters, the target pressurization parameters are determined according to target cylinder volume analysis, the target detection interface is determined according to target air inlet parameter analysis, and the target temperature change parameters are determined according to target working temperature analysis;
A pressurization processing execution unit for controlling a pressurization detection module of a target detection device to perform pressurization processing on the target cylinder body through the target detection interface by adopting the target pressurization parameter;
the pressure change time sequence obtaining unit is used for obtaining target pressure change time sequence information, wherein the target pressure change time sequence information is obtained by interaction with the pressure detection module;
the temperature change detection activation unit is used for inputting the target pressure change time sequence information into a pre-constructed airtight performance analysis module, obtaining target airtight performance information and activating a temperature change detection module based on the target airtight performance information;
the temperature change processing execution unit is used for controlling the temperature change detection module of the target detection device to perform temperature change processing on the target cylinder body through the target detection interface by adopting the target temperature change parameters;
wen Bianfen analysis execution unit, which is used to interact the temperature change detection module to obtain a temperature change image set, and to perform temperature change analysis on the temperature change image set to obtain the target leakage point coordinates.
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