GB2622708A - SVM-based cold flow test detection method and system during diesel engine assembly - Google Patents
SVM-based cold flow test detection method and system during diesel engine assembly Download PDFInfo
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Abstract
An SVM-based cold flow test detection method and system during diesel engine assembly. The method comprises: acquiring the intake pressure, crankshaft torque and exhaust pressure of a diesel engine, and constructing a cold flow test database; determining a distribution pattern of exhaust pressure data by means of bigdata analysis; according to the distribution pattern of the exhaust pressure data, obtaining threshold values for a normal exhaust pressure, a smaller exhaust pressure and a larger exhaust pressure; and after the threshold values are determined, constructing a sample set for diesel engine assembly quality detection on the basis of the cold flow test database, performing training and testing by using a support vector machine (SVM) algorithm, so as to form a cold flow test quality detection support vector machine algorithm model, and identifying the diesel engine assembly quality by means of the support vector machine algorithm model, such that an SVM-based cold flow test detection method during diesel engine assembly is formed. By means of the detection method and system, the accuracy of detection of diesel engine assembly quality is improved, thereby effectively identifying diesel engine assembly quality.
Description
SVM-BASED COLD FLOW TEST DETECTION METHOD AND
SYSTEM DURING DIESEL ENGINE ASSEMBLY
The present disclosure claims the priority of the Chinese Patent Application 202111153792.2 filed on September 29, 2021 and entitled "METHOD AND SYSTEM FOR DIESEL ENGINE ASSEMBLY COLD TEST DETECTION BASED ON SVM", which is incorporated herein by reference in its entirety.
TECHNICAL FIELD
The present disclosure relates to the field of the diesel engine, and particularly relates to a method and a system for diesel engine assembly cold test detection based on SVM
BACKGROUND
The statements in this part only provide background information relevant to the present disclosure and do not necessarily constitute the prior art.
The diesel engine is very complicated power machinery, and can provide power sources for various kinds of transport equipment. With the increasing demand of the society on environmental protection, hot test in a diesel engine assembly process is gradually replaced by cold test, and how to improve the cold test detection technology in the assembly process becomes a research focus. The exhaust pressure of the engine is one of major parameters of diesel engine quality detection. The exhaust pressure in a cold test is influenced by assembly parameters of the intake system, the cylinder head, the engine body, the piston and the crankshaft connecting rod system. The inventor found that there is no method and device to judge the assembly quality according to the correlation between the exhaust distribution characteristics of diesel engine and the above parameters in the existing technology and it is impossible to accurately detect the assembly failure of diesel engine caused by it.
SUMMARY
In view of the shortcomings of the existing technology, the purpose of this invention is to provide a SVM-based diesel engine assembly cold test detection method, with exhaust pressure as the main parameter, and determine its normal threshold range, according to the exhaust pressure-related feature vectors such as intake parameters, crankshaft torque parameters are classified. It can be used to judge the quality of assembly, which plays an extremely important role in improving the assembly quality of diesel engines. In order to achieve the above purpose, the present disclosure is realized through the following technical solution: a method for diesel engine assembly cold test detection based on SVM includes the following contents: acquiring an intake pressure, a crankshaft torque and an exhaust pressure of a diesel engine, and building a cold test database; judging a distribution pattern of exhaust pressure data by the big data analysis; obtaining a threshold of normal exhaust pressure, a threshold of lower exhaust pressure, and a threshold of higher exhaust pressure according to the distribution pattern of the exhaust pressure data; and after the thresholds are determined, building a diesel engine assembly quality detection sample set based on the cold test database, performing training and testing by a support vector machine (SVM) algorithm to form a cold test quality detection SVM model, and identifying the diesel engine assembly quality through the SVM mod& to form the method for diesel engine assembly cold test detection based on SVM.
According to the method for diesel engine assembly cold test detection based on SVM, the intake pressure, the crankshaft torque and the exhaust pressure of the diesel engine are detected by a cold test device.
According to the method for diesel engine assembly cold test detection based on SVM, the cold test device acquires data of intake pressure and exhaust pressure of the diesel engine through a gas pressure sensor, and acquires crankshaft torque data of the diesel engine through a torque sensor, and the cold test database is obtained by acquiring data of tens of thousands of diesel engines.
According to the method for diesel engine assembly cold test detection based on SVM, the distribution pattern of the exhaust pressure data is judged by a ratio (Z-score) of a statistical magnitude of a parameter skewness value to a standard error.
According to the method for diesel engine assembly cold test detection based on SVM, the data is in normal distribution in a case that the ratio of the statistical magnitude of the parameter skewness value to the standard error EI-2,21; the data is in positively skew distribution in a case that the ratio of the statistical magnitude of the parameter skewness value to the standard error >2; and the data is in negatively skew distribution in a case that the ratio of the statistical magnitude of the parameter skewness value to the standard error <-2.
According to the method for diesel engine assembly cold test detection based on SVIVI, a threshold of normal exhaust pressure, a threshold of lower exhaust pressure, and a threshold of higher exhaust pressure are determined by a 3cs principle of the big data analysis According to the method for diesel engine assembly cold test detection based on SVM, a normalization processing is respectively performed on a value of the intake pressure and a value of the crankshaft torque, the values are combined with classified exhaust pressure data, and the diesel engine assembly quality detection sample set based on the cold test database is built.
According to the method for diesel engine assembly cold test detection based on SVM, the SVM model is trained and tested by selecting a radial basis kernel function, an optimum penalty factor C and an optimum variance g are found by a cross validation method, that is, an iteration length is determined in a set parameter range, the penalty factors and variances are combined in a pairwi se manner, and a combination with highest precision is selected in a plurality of groups of cross validation According to the method for diesel engine assembly cold test detection based on SVM, the built diesel engine assembly quality detection sample set is divided into a training set and a test set, the training set is trained by using the SVM algorithm, the cold test quality detection SVM model is obtained, and the accuracy of the SVM model on the assembly quality detection is determined by using the test set so as to identify the diesel engine assembly quality.
In a second aspect, the present disclosure further provides a system for diesel engine assembly cold test detection based on SVM, using the method for diesel engine assembly cold test detection based on SVM, including a data processing unit, configured to build the cold test database by using the intake pressure, the crankshaft torque and the exhaust pressure of the diesel engine, judge the distribution pattern of exhaust pressure data in assembly feature parameters by the big data analysis, and obtain a threshold of normal assembly exhaust pressure, a threshold of lower assembly exhaust pressure, and a threshold of higher assembly exhaust pressure according to the distribution pattern of the exhaust pressure data to build the diesel engine assembly quality detection sample set; and a model building unit, configured to build the SVM model after a threshold of normal exhaust pressure, a threshold of lower exhaust pressure, and a threshold of higher exhaust pressure are determined, train and test the SVM model, and identify the diesel engine assembly quality through the trained and tested SVM model.
The present disclosure has the following beneficial effects: 1) The present disclosure builds the cold test database based on the intake pressure, the crankshaft torque and the exhaust pressure of the diesel engine, obtains the distribution pattern of the exhaust pressure data by the big data analysis, further determines a plurality of thresholds of the assembly exhaust pressure to lay the foundation for the assembly quality identification, builds a feature vector and build the SVM model after the thresholds are determined, and forms the method for diesel engine assembly cold test detection based on SVM.
2) The present disclosure trains and tests the SVM model by selecting a kernel function and finding penalty factors and variances, and improves the assembly quality, so that the assembly reliability is improved, and the practicability is high.
3) The invention is helpful to improve the accuracy of model by labeling and classifying different feature vectors of diesel engine..
BRIEF DESCRIPTION OF THE DRAWINGS
The drawings attached to the specification constituting a part of the present disclosure are used to provide further understanding on the present disclosure, and the exemplary embodiments of the present disclosure and their descriptions are used to illustrate the present disclosure and do not constitute improper limitation to the present disclosure.
FIG. 1 is a flowchart of a method for diesel engine assembly cold test detection based on SVM according to one or more implementations of the present disclosure
DETAILED DESCRIPTION
It should be noted that the following detailed descriptions are illustrative and are intended to provide further illustration on the present disclosure. Unless otherwise specified, all technical and scientific terms used in the present disclosure have the same meaning as they are normally understood by an ordinary skilled in the art.
It needs to be noted that the terms used herein are only intended to describe the specific implementations and are not intended to limit exemplary implementations according to the present disclosure. As used herein, unless otherwise specified in the present disclosure, the singular form is also intended to include the plural form. In addition, it also should be understood that when the terms "include" and/or "comprise" are used in this specification, they indicate the existence of features, steps, operations, devices, components and/or combinations thereof As described in the background, there is a problem that the diesel engine assembly quality detection cannot be accurately identified in the prior art. In order to solve the above technical problems, the present disclosure provides a method for diesel engine assembly cold test detection based on SVM.
In a typical implementation of the present disclosure, as shown in FIG. 1, a method for diesel engine assembly cold test detection based on SVM includes the following contents: an intake pressure, a crankshaft torque and an exhaust pressure of a diesel engine are acquired. A cold test database is built.
A distribution pattern of exhaust pressure data is judged by a big data analysis.
A threshold of normal exhaust pressure, a threshold of lower exhaust pressure, and a threshold of higher exhaust pressure are obtained according to the distribution pattern of the exhaust pressure data.
After the thresholds are determined, a diesel engine assembly quality detection sample set is built based on the cold test database. Training and testing are performed by using a support vector machine (SVM) algorithm to form a cold test quality detection SVM model. The diesel engine assembly quality is identified through the SVM model to form the method for diesel engine assembly cold test detection based on SVM.
Further, the intake pressure, the crankshaft torque and the exhaust pressure are detected by a cold test device.
Specifically, the cold test device acquires data of the intake pressure and the exhaust pressure of the diesel engine through a gas pressure sensor, and acquires crankshaft torque data of the diesel engine through a torque sensor, and the cold test database is obtained by acquiring data of tens of thousands of diesel engines.
For the distribution pattern of the exhaust pressure data, the distribution pattern of the exhaust pressure data is judged through a ratio (Z-score) of a statistical magnitude of a parameter skewness value to a standard error. A calculation formula of the skewness value is = 1 [( X, In the ) ], and a calculation formula of a standard error is n SE formula, 1/ represents a sample mean value, and a represents a sample standard deviation. In a case that Z-score [-2,2], the data is in normal distribution. In a case that Z-score >2, the data is in positively skew distribution. In a case that Z-score <-2, the data is in negatively skew distribution.
In a case that the data is in normal distribution, a mean value u and a standard deviation G are determined. According to (u-3G, u+3c)], a non-nal parameter range of the exhaust pressure is obtained For the condition that the data is in positively skew distribution, in a case that Z-score (2,3], the data needs to be integrally subjected to extraction of square root, i.e., X = sff In a case that Z-score >3, the data may be subjected to a natural logarithm (In) new taking operation, i.e., II =1nX, and the pattern is converted into normal distribution. For the condition that the data is in negatively skew distribution, in a case that Z-score e(-3,-2], a conversion formula needing to be used is X". = VX+1-X. In a case that Z-score <-3, a conversion formula needing to be used is X = ln(X",," +1-X) , and the pattern is converted into normal distribution. A threshold range may be determined through normal distribution. A value is an abnormal value when the exhaust pressure is equal to or lower than u-3G or higher than u+3G, wherein, the u-3G is the lower threshold of the exhaust pressure and the u+3G is the higher threshold of the exhaust pressure. Therefore, a corresponding threshold determining method is given by aiming at different data distribution patterns, and the foundation is laid for assembly quality identification.
In this embodiment, a threshold of normal exhaust pressure, a threshold of lower exhaust pressure, and a threshold of higher exhaust pressure are determined by a 3G principle of the big data analysis.
During building the SVM model, the feature vector needs to be built, and the feature vector is endowed with a label for classification. In some examples, the labels are respectively 0, 1 and 2. 0 represents a feature vector with the exhaust pressure lower than the threshold minimum value, 1 represents a feature vector with the exhaust pressure within a threshold range, and 2 represents a feature vector with the exhaust pressure higher than the threshold maximum value.
Further, a normalization processing is respectively performed on a value of the intake pressure and a value of the crankshaft torque, all values are mapped into a range [-1,1], a mapping operation formula is y = 2*(x-x)/(x -.x""" ) -1, the values are combined with the classified exhaust pressure data, and the diesel engine assembly quality detection sample set is built based on the cold test database. ;Further, the SVM model is trained and tested by selecting a kernel function. In this embodiment, the selected kernel function is a radial basis kernel function, and a formula is as follows: max - E 1(7)K(Xj, Xi k 2;4 f 1(k, -1(;)= 0, 0 k, cm0 In the formula, K(iv,,X, ) = exP(-glIX, X/112)'g>0 is the radial basis kernel function, and 6 represents an insensitive loss coefficient. The radial basis kernel function can effectively solve the problem that the sample type and the feature factor are in a nonlinear relationship, and an optimum penalty factor C and an optimum variance g are found by a cross validation method, that is, an iteration length is determined in a set parameter range, such as (-10, 10). The iteration length may be selected to be 0.5, the penalty factors and variances are combined in a pairwise manner, and a combination with highest precision is selected in a plurality of groups of cross validation. In this embodiment, the penalty factor C is selected to be 0.33, and the variance g is selected to be 1.32. ;Further, the built diesel engine assembly quality detection sample set is divided into a training set and a test set, the training set is trained by the SVM algorithm to obtain the cold test quality detection SVM model, and the accuracy of the SVM model on the assembly quality detection is determined by using the test set, so that the diesel engine assembly quality is identified According to the method for diesel engine assembly cold test detection based on SVM provided by the present disclosure, the diesel engine assembly exhaust pressure data is used as a basis to build the SVM model, and the SVM model is trained and tested. Additionally, other assembly feature parameters such as intake pressure and crankshaft torque are also considered, and the accuracy of the SVM model on the assembly quality detection is effectively ensured. Through the trained and tested SVM model, the accuracy on the diesel engine assembly quality identification can be improved, and the diesel engine assembly reliability is correspondingly improved. ;Embodiment II This embodiment provides a system for diesel engine assembly cold test detection based on SVM, using the method for diesel engine assembly cold test detection based on SVM, including: a data processing unit, configured to build the cold test database by using the intake pressure, the crankshaft torque and the exhaust pressure of the diesel engine, judge the distribution pattern of exhaust pressure data in assembly feature parameters by the big data analysis, and obtain a threshold of normal assembly exhaust pressure, a threshold of lower assembly exhaust pressure, and a threshold of higher assembly exhaust pressure according to the distribution pattern of the exhaust pressure data to build the diesel engine assembly quality detection sample set; and a model building unit, configured to build the SVM model after a threshold of normal exhaust pressure, a threshold of lower exhaust pressure, and a threshold of higher exhaust pressure are determined, train and test the SVM model, and identify the diesel engine assembly quality through the trained and tested SVM model. Therefore, the system for diesel engine assembly cold test detection based on SVM is formed through the data processing unit and the model building unit. ;It can be understood that the system for diesel engine assembly cold test detection based on SVM may be stored through a storage device such as a computer. ;Further, the model building unit builds the SVM model according to the determined a threshold of normal exhaust pressure, a threshold of lower exhaust pressure, and a threshold of higher exhaust pressure. ;In the built SVM model, the feature vector needs to be built, the feature vector is endowed with the labels of 0, 1 and 2 for classification. 0 represents a feature vector with the exhaust pressure lower than the threshold minimum value, 1 represents a feature vector with the exhaust pressure within a threshold range, and 2 represents a feature vector with the exhaust pressure higher than the threshold maximum value. ;Further, a normalization processing is respectively performed on a value of the intake pressure and a value of the crankshaft torque, all values are mapped into a range [-1,1], a mapping operation formula is y = 2*(x-x""")/(x""". -x"" ) -1, the values are combined with the classified exhaust pressure data, and the diesel engine assembly quality detection sample set is built based on the cold test database.
For the distribution pattern of the exhaust pressure data, the distribution pattern of the exhaust pressure data is judged through a ratio (Z-score) of a statistical magnitude of a parameter skewness value to a standard error. In a case that Z-score E[-2,2], the data is in normal distribution. In a case that Z-score >2, the data is in positively skew distribution. In a case that Z-score< -2, the data is in negatively skew distribution.
The SVIVI model is trained and tested by selecting the radial basis kernel function. The kernel function is a radial basis kernel function, an optimum penalty factor C and an optimum variance g are found by a cross validation method, that is, an iteration length is determined in a set parameter range, such as (-10, 10), the iteration length may be selected to be 0.5, the penalty factors and variances are combined in a pairwise manner, and a combination with highest precision is selected in a plurality of groups of cross validation.
Further, the built diesel engine assembly quality detection sample set is divided into a training set and a test set, the training set is trained by the SVM algorithm to obtain the cold test quality detection SVM model, and the accuracy of the SVM model on the assembly quality detection is determined by using the test set, so that the diesel engine assembly quality is identified.
The above descriptions are merely preferred embodiments of the present disclosure, but are not intended to limit the present disclosure. For those skilled in the art, various changes and variations may be made according to the present disclosure. Any modification, equivalent substitution, improvement, etc. made within the spirit and principles of the present disclosure shall fall within the protection scope of the present disclosure.
Claims (6)
- CLAIMSWhat is claimed is: I. A method for diesel engine assembly cold test detection based on SVM, comprising the following contents.acquiring an intake pressure, a crankshaft torque and an exhaust pressure of a diesel engine, and building a cold test database; judging a distribution pattern of exhaust pressure data by a big data analysis; obtaining a threshold of normal exhaust pressure, a threshold of lower exhaust pressure, and a threshold of higher exhaust pressure according to the distribution pattern of the exhaust pressure data; after the thresholds are determined, building a diesel engine assembly quality detection sample set based on the cold test database, performing training and testing by using a SVM algorithm to form a cold test quality detection SVM model, and identifying the diesel engine assembly quality through the SVM model to form the method for diesel engine assembly cold test detection based on SVM; judging the distribution pattern of the exhaust pressure data by a ratio of a statistical magnitude of a parameter skewness value to a standard error, obtaining a judging result that the data is in normal distribution in a case that the ratio of the statistical magnitude of the parameter skewness value to the standard error [-2,2]; obtaining a judging result that the data is in positively skew distribution in a case that the ratio of the statistical magnitude of the parameter skewness value to the standard error >2; obtaining a judging result that the data is in negatively skew distribution in a case that the ratio of the statistical magnitude of the parameter skewness value to the standard error <-2; determining a threshold of normal exhaust pressure, a threshold of lower exhaust pressure, and a threshold of higher exhaust pressure by a 3G principle of the big data analysis; and respectively performing normalization processing on a value of the intake pressure and a value of the crankshaft torque, respectively combining the values with classified exhaust pressure data, and building the diesel engine assembly quality detection sample set based on the cold test database.
- 2. The method for diesel engine assembly cold test detection based on SVM according to claim 1, wherein the intake pressure, the crankshaft torque and the exhaust pressure of the diesel engine are detected by a cold test device
- 3. The method for diesel engine assembly cold test detection based on SVM according to claim 2, wherein the cold test device acquires data of intake pressure and exhaust pressure of the diesel engine through a gas pressure sensor, and acquires crankshaft torque data of the diesel engine through a torque sensor.
- 4. The method for diesel engine assembly cold test detection based on SVM according to claim 1, wherein the SVM model is trained and tested by selecting a radial basis kernel function, an optimum penalty factor C and an optimum variance g are found by a cross validation method, that is, an iteration length is determined in a set parameter range, the penalty factors and variances are combined in a pairwise manner, and a combination with highest precision is selected in a plurality of groups of cross validation.
- 5. The method for diesel engine assembly cold test detection based on SVM according to claim 4, wherein the built diesel engine assembly quality detection sample set is divided into a training set and a test set, the training set is trained by using a SVM, the cold test quality detection SVM model is obtained, and the accuracy of the SVM model on the assembly quality detection is determined by using the test set so as to identify the diesel engine assembly quality.
- 6. A system for diesel engine assembly cold test detection based on SVM, using the method for diesel engine assembly cold test detection based on SVM according to claim 1 and comprising: a data processing unit, configured to build the cold test database by using the intake pressure, the crankshaft torque and the exhaust pressure of the diesel engine, judge the distribution pattern of exhaust pressure data in assembly feature parameters by the big data analysis, and obtain a threshold of normal assembly exhaust pressure, a threshold of lower assembly exhaust pressure, and a threshold of higher assembly exhaust pressure according to the distribution pattern of the exhaust pressure data to build the diesel engine assembly quality detection sample set; and a model building unit, configured to build the SVM model after a threshold of normal exhaust pressure, a threshold of lower exhaust pressure, and a threshold of higher exhaust pressure are determined, train and test the SVM model, and identify the diesel engine assembly quality through the trained and tested SVM model.
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| CN202111153792.2A CN113884305B (en) | 2021-09-29 | 2021-09-29 | Diesel engine assembly cold test detection method and system based on SVM |
| PCT/CN2022/119171 WO2023051275A1 (en) | 2021-09-29 | 2022-09-16 | Svm-based cold flow test detection method and system during diesel engine assembly |
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| CN113884305B (en) * | 2021-09-29 | 2022-06-28 | 山东大学 | Diesel engine assembly cold test detection method and system based on SVM |
| CN116433111B (en) * | 2023-06-15 | 2023-10-20 | 潍柴动力股份有限公司 | Construction method and quality evaluation method of crankshaft assembly torque quality detection system |
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