A transient combustion simulation and test analysis system for piston internal combustion engines

Abstract

The present invention relates to the technical field of combustion simulation of internal combustion engines, and specifically discloses a transient combustion simulation and test analysis system for piston internal combustion engines, including: a test module, which is used to obtain all difference moments and all non-difference moments of each type of combustion parameter of the internal combustion engine based on the simulation parameters of all types of combustion parameters at each moment in the combustion time period of the internal combustion engine; a construction module, which is used to obtain the simulation influence of each type of simulation factor of the internal combustion engine based on all difference moments and all non-difference moments of all types of combustion parameters of the internal combustion engine; an optimization module, which is used to obtain the test analysis results of the internal combustion engine based on the simulation influence of all types of simulation factors of the internal combustion engine. The present invention realizes the precise positioning of the error source in the process of combustion simulation of the piston internal combustion engine, which is convenient for the subsequent re-optimization of the transient combustion simulation of the piston internal combustion engine, and helps to further improve the simulation accuracy and reliability of the internal combustion engine.

Description

Technical Field

[0001] The invention relates to the technical field of internal combustion engine combustion simulation, and in particular to a transient combustion simulation and test analysis system for a piston type internal combustion engine. Background Art

[0002] At present, with the continuous development of internal combustion engine technology, the requirements for the accuracy of combustion simulation are becoming higher and higher. Although traditional experimental methods can obtain various combustion parameters of internal combustion engines, they have problems such as high cost, long cycle, and difficulty in data acquisition. The combustion simulation method can provide a fast, economical and accurate way to predict the combustion process of internal combustion engines. However, the accuracy of the combustion simulation method depends to a large extent on the reasonable selection and accurate setting of boundary conditions and physical models. Therefore, it is necessary to refine the combustion simulation process of internal combustion engines to improve the accuracy and reliability of the simulation results.

[0003] However, in practical applications, there are often certain errors in the combustion simulation process of internal combustion engines. These errors may come from many aspects, such as model simplification, experimental errors, boundary condition settings, etc. In order to accurately evaluate and optimize the combustion process of internal combustion engines, it is necessary to accurately locate these error sources and take corresponding improvement measures. Therefore, how to accurately locate the error sources has become one of the key issues in the transient combustion simulation of piston internal combustion engines.

[0004] Therefore, the present invention proposes a transient combustion simulation and test analysis system for a piston internal combustion engine. Summary of the invention

[0005] The present invention provides a transient combustion simulation and test analysis system for a piston internal combustion engine, which is used to obtain the difference of all types of combustion parameters of the internal combustion engine at each moment in the combustion time period according to the simulation parameters and test parameters of all types of combustion parameters of the internal combustion engine at each moment in the combustion time period, thereby quantifying the difference degree of each type of combustion parameter of the internal combustion engine at each moment in the combustion time period, and then obtaining all difference moments and all non-difference moments of each type of combustion parameter of the internal combustion engine according to the difference degree of each type of combustion parameter of the internal combustion engine at all moments in the combustion time period, thereby facilitating the construction of a subsequent test analysis matrix for the internal combustion engine. According to all the difference moments and all the non-difference moments of all types of combustion parameters of the internal combustion engine, the test analysis matrix of the internal combustion engine is obtained, and then according to the test analysis matrix of the internal combustion engine, the simulation influence of each type of simulation factor of the internal combustion engine is obtained, and the possibility of each type of simulation factor of the internal combustion engine causing errors in the combustion simulation process of the internal combustion engine is accurately quantified. Finally, according to the simulation influence of all types of simulation factors of the internal combustion engine, the predicted simulation improvement factors and test analysis results of the internal combustion engine are obtained, which realizes the precise positioning of the error sources in the process of combustion simulation of the piston internal combustion engine, so as to facilitate the subsequent re-optimization of the transient combustion simulation of the piston internal combustion engine.

[0006] The present invention provides a piston internal combustion engine transient combustion simulation and test analysis system, comprising:

[0007] A combustion simulation module, for obtaining simulation parameters of all types of combustion parameters of the internal combustion engine at each moment in a combustion time period based on a preset combustion simulation mode and basic parameters, type and fuel type of the internal combustion engine;

[0008] A test module, for obtaining the difference of all types of combustion parameters of the internal combustion engine at each moment in the combustion time period based on the simulation parameters and the test parameters of all types of combustion parameters of the internal combustion engine at each moment in the combustion time period, and obtaining all difference moments and all non-difference moments of each type of combustion parameter of the internal combustion engine based on the difference of each type of combustion parameter at all moments in the combustion time period;

[0009] A construction module is used to obtain a test analysis matrix of the internal combustion engine based on all difference moments and all non-difference moments of all types of combustion parameters of the internal combustion engine, and obtain a simulation influence degree of each type of simulation factor of the internal combustion engine based on the test analysis matrix of the internal combustion engine;

[0010] The optimization module is used to obtain the predicted simulation improvement factor of the internal combustion engine based on the simulation influence of all types of simulation factors of the internal combustion engine, and obtain the test analysis result of the internal combustion engine based on the predicted simulation improvement factor of the internal combustion engine.

[0011] Preferably, the transient combustion simulation and test analysis system for piston internal combustion engines, the combustion simulation module, comprises:

[0012] Setting a submodule, used to treat the time length set by the backend on the transient combustion simulation and test analysis system of a piston internal combustion engine as a combustion time period, and obtain the basic parameters, type and fuel type of the internal combustion engine, wherein the basic parameters include the geometric parameters of the piston, cylinder and combustion chamber;

[0013] A first combustion simulation submodule, for obtaining a geometric model of the internal combustion engine based on basic parameters of the internal combustion engine, and obtaining setting boundary conditions of the internal combustion engine based on a preset boundary condition database of the internal combustion engine and the basic parameters, type and fuel type of the internal combustion engine;

[0014] The second combustion simulation submodule is used to obtain simulation parameters of all types of combustion parameters of the internal combustion engine at each moment in the combustion time period based on the geometric model of the internal combustion engine, setting boundary conditions and preset combustion simulation methods.

[0015] Preferably, the transient combustion simulation and test analysis system for a piston internal combustion engine, the second combustion simulation submodule comprises:

[0016] A setting unit, used to set the combustion time period to a simulation time length of the internal combustion engine;

[0017] The combustion simulation unit is used to obtain the simulation parameters of all types of combustion parameters of the internal combustion engine at each moment in the combustion time period based on the geometric model of the internal combustion engine, setting boundary conditions, presetting the combustion simulation method and simulation time length, wherein all types of combustion parameters include cylinder pressure, cylinder temperature, cylinder convection heat transfer coefficient and fuel consumption rate.

[0018] Preferably, the transient combustion simulation and test analysis system for piston internal combustion engines, the test module, comprises:

[0019] A test submodule, for obtaining test parameters of all types of combustion parameters of the internal combustion engine at each moment in a combustion time period based on preset test equipment and basic parameters, type and fuel type of the internal combustion engine;

[0020] A difference calculation submodule, for obtaining the difference of all types of combustion parameters of the internal combustion engine at each moment in the combustion time period based on the simulation parameters and test parameters of all types of combustion parameters of the internal combustion engine at each moment in the combustion time period;

[0021] The analysis submodule is used to obtain all difference moments and all non-difference moments of each type of combustion parameter of the internal combustion engine based on the difference degree of each type of combustion parameter at all moments in the combustion time period of the internal combustion engine.

[0022] Preferably, the transient combustion simulation and test analysis system for piston internal combustion engines, the difference calculation submodule, comprises:

[0023] A preparation unit, used to treat the numerical difference between the simulation parameter and the test parameter of each type of combustion parameter of the internal combustion engine at each moment in the combustion time period as an error value of the corresponding type of combustion parameter of the internal combustion engine at the corresponding moment in the combustion time period;

[0024] The difference calculation unit is used to obtain the difference of each type of combustion parameter of the internal combustion engine at each moment in the combustion time period based on the error value of each type of combustion parameter at all moments in the combustion time period of the internal combustion engine.

[0025] Preferably, in the transient combustion simulation and test analysis system for a piston internal combustion engine, the difference calculation unit obtains the difference of each type of combustion parameter of the internal combustion engine at each moment in the combustion time period based on the error value of each type of combustion parameter at all moments in the combustion time period of the internal combustion engine, comprising:

[0026] ;

[0027] in, is the difference of the current calculation type combustion parameters of the internal combustion engine at the current calculation time within the combustion time period, α is the error value of the current calculation type combustion parameters of the internal combustion engine at the current calculation time within the combustion time period, α 0 is the mean of the error values ​​of the current calculation type combustion parameters of the internal combustion engine at all times in the combustion time period, ω is the value of the test parameter of the current calculation type combustion parameters of the internal combustion engine at the current calculation moment in the combustion time period, is the standard deviation of the error value of each type of combustion parameter of the internal combustion engine at all times in the combustion time period, n is the number of all times in the combustion time period, ln is the natural logarithm, and the value of the natural constant e is 2.718.

[0028] Preferably, the transient combustion simulation and test analysis system for piston internal combustion engines, the analysis submodule, comprises:

[0029] A first analysis unit is used to use the difference between the maximum value of the difference of each type of combustion parameter of the internal combustion engine at all times in the combustion time period and the standard deviation of the difference of the corresponding type of combustion parameter of the internal combustion engine at all times in the combustion time period as the difference threshold of each type of combustion parameter of the internal combustion engine;

[0030] The second analysis unit is used to determine whether the difference of each type of combustion parameters of the internal combustion engine at each moment within the combustion time period is greater than the difference threshold of the corresponding type of combustion parameters. If so, the corresponding moment is regarded as the difference moment of the corresponding type of combustion parameters of the internal combustion engine; otherwise, the corresponding moment is regarded as the non-difference moment of the corresponding type of combustion parameters of the internal combustion engine.

[0031] Preferably, the transient combustion simulation and test analysis system for a piston internal combustion engine comprises:

[0032] A submodule is constructed, which is used to regard 1 as the element score value of the corresponding type of combustion parameter of the internal combustion engine at the corresponding moment in the combustion time period if each moment in the combustion time period of the internal combustion engine is a difference moment of each type of combustion parameter, and regard 0 as the element score value of the corresponding type of combustion parameter of the internal combustion engine at the corresponding moment in the combustion time period if each moment in the combustion time period of the internal combustion engine is a non-difference moment of each type of combustion parameter. Based on the element score values ​​of all types of combustion parameters of the internal combustion engine at all moments in the combustion time period, the test analysis matrix of the internal combustion engine is obtained, which is:

[0033] ;

[0034] Among them, G is the test analysis matrix of the internal combustion engine, a 1 Assign a value to the element of the cylinder pressure at the first moment in the combustion period of the internal combustion engine, a 2 Assign a value to the element of the cylinder pressure at the second moment in the combustion period of the internal combustion engine, a n Assign a score to the element of the cylinder pressure at the nth moment in the combustion time period of the internal combustion engine, where n is the number of all moments in the combustion time period, and b 1 Assign a value to the element of the cylinder temperature at the first moment in the combustion period of the internal combustion engine, b 2 Assign a value to the element of the cylinder temperature at the second moment in the combustion period of the internal combustion engine, b n Assign a value to the element of the cylinder temperature at the nth moment in the combustion period of the internal combustion engine, c 1 Assign a value to the element of the in-cylinder convection heat transfer coefficient of the internal combustion engine at the first moment in the combustion time period, c 2 Assign a value to the element of the in-cylinder convection heat transfer coefficient of the internal combustion engine at the second moment in the combustion period, c n Assign a value to the element of the cylinder convection heat transfer coefficient at the nth moment in the combustion time period of the internal combustion engine, d 1 Assign a value to the element of the fuel consumption rate of the internal combustion engine at the first moment in the combustion time period, d 2 Assign a value to the element of the fuel consumption rate of the internal combustion engine at the second moment in the combustion time period, d n Assigning a score value to the element of the fuel consumption rate of the internal combustion engine at the nth moment in the combustion time period;

[0035] The simulation influence analysis submodule is used to obtain the simulation influence of each type of simulation factor of the internal combustion engine based on the test analysis matrix of the internal combustion engine.

[0036] Preferably, the transient combustion simulation and test analysis system for piston internal combustion engines, the simulation impact analysis submodule, comprises:

[0037] An acquisition unit, used for acquiring all types of simulation factors of the internal combustion engine, wherein all types of simulation factors include boundary condition factors, experimental error factors and model simplification factors;

[0038] A simulation influence degree analysis unit is used to treat the test analysis matrix of the internal combustion engine as an analysis matrix of boundary condition factors, delete the bottom row matrix in the test analysis matrix of the internal combustion engine to obtain a new matrix, and use the obtained new matrix as an analysis matrix of model simplification factors, use the number of elements with matrix elements of 1 in each row matrix of the test analysis matrix of the internal combustion engine as a reference coefficient of the corresponding row matrix, and delete the row matrix with the largest reference coefficient and the row matrix with the smallest reference coefficient in all row matrices of the test analysis matrix of the internal combustion engine to obtain a new matrix, and use the obtained new matrix as an analysis matrix of experimental error factors;

[0039] The simulation influence calculation unit is used to obtain the simulation influence of each type of simulation factor of the internal combustion engine based on the analysis matrix of boundary condition factors, the analysis matrix of model simplification factors and the analysis matrix of experimental error factors, that is:

[0040] ;

[0041] Among them, μ is the simulation influence of the current calculation type simulation factor of the internal combustion engine, is the rank of the analysis matrix of the simulation factors of the current calculation class of the internal combustion engine, is the sum of the ranks of the analysis matrices of all class simulation factors of the internal combustion engine, ε is the number of row matrices in the analysis matrix of the current calculation class simulation factors of the internal combustion engine, ln is the natural logarithm, and the value of the natural constant e is 2.718.

[0042] Preferably, the transient combustion simulation and test analysis system of a piston internal combustion engine, the optimization module, comprises:

[0043] The optimization analysis submodule is used to take the simulation factor with the greatest simulation influence among all types of simulation factors of the internal combustion engine as the prediction simulation improvement factor of the internal combustion engine;

[0044] The optimization submodule is used to treat the prediction simulation improvement factors of the internal combustion engine as the test analysis results of the internal combustion engine.

[0045] The beneficial effects of the present invention compared with the prior art are as follows: based on the simulation parameters and test parameters of all types of combustion parameters of the internal combustion engine at each moment in the combustion time period, the difference of all types of combustion parameters of the internal combustion engine at each moment in the combustion time period is obtained, and the difference degree of each type of combustion parameter of the internal combustion engine at each moment in the combustion time period is quantified, and then based on the difference of each type of combustion parameter of the internal combustion engine at all moments in the combustion time period, all difference moments and all non-difference moments of each type of combustion parameter of the internal combustion engine are obtained, which is convenient for the subsequent construction of the test analysis matrix of the internal combustion engine. The test analysis matrix of the internal combustion engine is obtained by all difference moments and all non-difference moments of all types of combustion parameters. Then, based on the test analysis matrix of the internal combustion engine, the simulation influence of each type of simulation factor of the internal combustion engine is obtained, and the possibility of each type of simulation factor of the internal combustion engine causing errors in the combustion simulation process of the internal combustion engine is accurately quantified. Finally, based on the simulation influence of all types of simulation factors of the internal combustion engine, the predicted simulation improvement factors and test analysis results of the internal combustion engine are obtained, which realizes the precise positioning of the error sources in the combustion simulation process of the piston internal combustion engine, and facilitates the subsequent re-optimization of the transient combustion simulation of the piston internal combustion engine.

[0046] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structure specifically pointed out in the written application document.

[0047] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0049] Figure 1 A schematic diagram of a transient combustion simulation and test analysis system for a piston internal combustion engine according to an embodiment of the present invention;

[0050] Figure 2 It is a specific schematic diagram of the combustion simulation module in an embodiment of the present invention. DETAILED DESCRIPTION

[0051] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0052] Embodiment 1: The present invention provides a piston internal combustion engine transient combustion simulation and test analysis system, referring to Figure 1 ,include:

[0053] A combustion simulation module, for obtaining simulation parameters of all types of combustion parameters of the internal combustion engine at each moment in a combustion time period based on a preset combustion simulation mode and basic parameters, type and fuel type of the internal combustion engine;

[0054] A test module, for obtaining the difference of all types of combustion parameters of the internal combustion engine at each moment in the combustion time period based on the simulation parameters and the test parameters of all types of combustion parameters of the internal combustion engine at each moment in the combustion time period, and obtaining all difference moments and all non-difference moments of each type of combustion parameter of the internal combustion engine based on the difference of each type of combustion parameter at all moments in the combustion time period;

[0055] A construction module is used to obtain a test analysis matrix of the internal combustion engine based on all difference moments and all non-difference moments of all types of combustion parameters of the internal combustion engine, and obtain a simulation influence degree of each type of simulation factor of the internal combustion engine based on the test analysis matrix of the internal combustion engine;

[0056] The optimization module is used to obtain the predicted simulation improvement factor of the internal combustion engine based on the simulation influence of all types of simulation factors of the internal combustion engine, and obtain the test analysis result of the internal combustion engine based on the predicted simulation improvement factor of the internal combustion engine.

[0057] In this embodiment, the preset combustion simulation method is a pre-set method for performing transient combustion simulation of a piston internal combustion engine. The preset combustion simulation method in this embodiment is the existing internal combustion engine combustion simulation using CONVERGE CFD. This method can simulate the combustion process of the internal combustion engine according to the geometric model of the internal combustion engine, set boundary conditions and simulation time length.

[0058] In this embodiment, the basic parameters of the internal combustion engine are the geometric parameters of the piston, cylinder and combustion chamber.

[0059] In this embodiment, the type is a specific type of piston internal combustion engine, such as a reciprocating piston internal combustion engine, a rotary piston internal combustion engine, and the like.

[0060] In this embodiment, the fuel type is the fuel type required by a piston internal combustion engine, such as gasoline, diesel, etc.

[0061] In this embodiment, the combustion time period is a time length set in the background on the piston internal combustion engine transient combustion simulation and test analysis system, and the combustion time period is not associated with any specific date or time point, it is just a time length.

[0062] In this embodiment, each moment is a moment selected from the combustion time period, and the time length between each adjacent moment is the same.

[0063] In this embodiment, the simulation parameters of the combustion parameters are the simulation values ​​of each type of combustion parameters at each moment when the combustion simulation of the internal combustion engine is performed in the combustion time period.

[0064] In this embodiment, the test parameters of the combustion parameters are the test quantities of each type of combustion parameters at each moment when a real combustion test is performed on the internal combustion engine during a combustion time period (the test parameters of the combustion parameters are the quantities of each type of combustion parameters collected during an actual combustion test on an internal combustion engine that is consistent with the basic parameters, type and fuel type of the internal combustion engine used in the internal combustion engine combustion simulation process).

[0065] In this embodiment, the degree of difference of combustion parameters is a numerical value obtained based on simulation parameters and test parameters of each type of combustion parameters of the internal combustion engine at each moment in the combustion time period, which can characterize the degree of difference of each type of combustion parameters of the internal combustion engine at each moment in the combustion time period.

[0066] In this embodiment, the difference moments of each type of combustion parameter are moments selected from the combustion time period of the internal combustion engine, which show that each type of combustion parameter has a large degree of difference during the combustion simulation and test analysis process.

[0067] In this embodiment, the non-difference moments of each type of combustion parameter are moments selected from the combustion time period of the internal combustion engine and showing that each type of combustion parameter has a smaller degree of difference during the combustion simulation and test analysis process.

[0068] In this embodiment, the test analysis matrix of the internal combustion engine is a matrix that can analyze the simulation influence of each type of simulation factor of the internal combustion engine.

[0069] In this embodiment, the simulation influence of each type of simulation factor is a numerical value obtained based on the test analysis matrix of the internal combustion engine, which can characterize the possibility that each type of simulation factor of the internal combustion engine causes errors in the internal combustion engine combustion simulation process.

[0070] In this embodiment, the predicted simulation improvement factor is based on the simulation influence of all types of simulation factors of the internal combustion engine, and the predicted simulation factors of the internal combustion engine that need to be improved to solve the errors in the internal combustion engine combustion simulation process are predicted.

[0071] In this embodiment, the test analysis results of the internal combustion engine are the prediction simulation improvement factors of the internal combustion engine.

[0072] The beneficial effects of the above technology are as follows: based on the simulation parameters and test parameters of all types of combustion parameters of the internal combustion engine at each moment in the combustion time period, the difference of all types of combustion parameters of the internal combustion engine at each moment in the combustion time period is obtained, and the degree of difference of each type of combustion parameter of the internal combustion engine at each moment in the combustion time period is quantified, and then based on the difference of each type of combustion parameter of the internal combustion engine at all moments in the combustion time period, all difference moments and all non-difference moments of each type of combustion parameter of the internal combustion engine are obtained, which is convenient for the construction of the subsequent test analysis matrix of the internal combustion engine, and based on all types of combustion parameters of the internal combustion engine All difference moments and all non-difference moments of combustion parameters are combined to obtain the test analysis matrix of the internal combustion engine, and then based on the test analysis matrix of the internal combustion engine, the simulation influence of each type of simulation factor of the internal combustion engine is obtained, and the possibility of each type of simulation factor of the internal combustion engine causing errors in the combustion simulation process of the internal combustion engine is accurately quantified. Finally, according to the simulation influence of all types of simulation factors of the internal combustion engine, the predicted simulation improvement factors and test analysis results of the internal combustion engine are obtained, which realizes the precise positioning of the error sources in the process of combustion simulation of piston internal combustion engines, which is convenient for the subsequent re-optimization of transient combustion simulation of piston internal combustion engines.

[0073] Example 2: Based on Example 1, a piston internal combustion engine transient combustion simulation and test analysis system, a combustion simulation module, and a reference Figure 2 ,include:

[0074] Setting a submodule, used to treat the time length set by the backend on the transient combustion simulation and test analysis system of a piston internal combustion engine as a combustion time period, and obtain the basic parameters, type and fuel type of the internal combustion engine, wherein the basic parameters include the geometric parameters of the piston, cylinder and combustion chamber;

[0075] A first combustion simulation submodule, for obtaining a geometric model of the internal combustion engine based on basic parameters of the internal combustion engine, and obtaining setting boundary conditions of the internal combustion engine based on a preset boundary condition database of the internal combustion engine and the basic parameters, type and fuel type of the internal combustion engine;

[0076] The second combustion simulation submodule is used to obtain simulation parameters of all types of combustion parameters of the internal combustion engine at each moment in the combustion time period based on the geometric model of the internal combustion engine, setting boundary conditions and preset combustion simulation methods.

[0077] In this embodiment, the background is the background of the transient combustion simulation and test analysis system of the piston internal combustion engine.

[0078] In this embodiment, the geometric parameters are parameters that describe geometric shapes, sizes, and relative positional relationships.

[0079] In this embodiment, the geometric model of the internal combustion engine is a CAD model of the internal combustion engine established based on the geometric parameters of the piston (a mechanical part that performs reciprocating motion in the internal combustion engine), the cylinder (a cylindrical metal mechanical part that guides the piston to perform linear reciprocating motion in the cylinder) and the combustion chamber (a device for burning fuel in the internal combustion engine to generate high-temperature combustion gas).

[0080] In this embodiment, the boundary condition database of the preset internal combustion engine is composed of multiple groups of pre-collected basic parameters, types and fuel types of the internal combustion engine (the basic parameters, type and fuel type of one internal combustion engine form a group) as model input, and the setting boundary conditions of the internal combustion engine corresponding to each group of basic parameters, type and fuel type of the internal combustion engine that are manually labeled are used as model output. The trained neural network model that can input the basic parameters, type and fuel type of the internal combustion engine can output the setting boundary conditions of the internal combustion engine.

[0081] In this embodiment, the setting boundary conditions of the internal combustion engine are initial conditions that need to be set during the combustion simulation process of the internal combustion engine, such as the air intake temperature, the air intake pressure, etc.

[0082] The beneficial effects of the above technology are: a specific method for combustion simulation of a piston internal combustion engine is given in detail, and the simulation parameters of all types of combustion parameters of the internal combustion engine at each moment in the combustion time period are accurately obtained, which facilitates the subsequent acquisition of the difference of each type of combustion parameters.

[0083] Embodiment 3: Based on Embodiment 2, the transient combustion simulation and test analysis system for a piston internal combustion engine, the second combustion simulation submodule, comprises:

[0084] A setting unit, used to set the combustion time period to a simulation time length of the internal combustion engine;

[0085] The combustion simulation unit is used to obtain the simulation parameters of all types of combustion parameters of the internal combustion engine at each moment in the combustion time period based on the geometric model of the internal combustion engine, setting boundary conditions, presetting the combustion simulation method and simulation time length, wherein all types of combustion parameters include cylinder pressure, cylinder temperature, cylinder convection heat transfer coefficient and fuel consumption rate.

[0086] In this embodiment, the simulation time length of the internal combustion engine is a preset time length for performing combustion simulation on the piston internal combustion engine.

[0087] In this embodiment, the in-cylinder pressure is the pressure in the cylinder of the internal combustion engine, and the unit of the pressure is Pa.

[0088] In this embodiment, the in-cylinder temperature is the temperature in the cylinder of the internal combustion engine, and the unit of the temperature is Celsius.

[0089] In this embodiment, the in-cylinder convective heat transfer coefficient is the ratio of the amount of heat transferred per unit area to the temperature difference during the heat transfer process between the fluid (such as gas) and the solid surface (such as the cylinder wall, piston, etc.) in the cylinder of the internal combustion engine, and the unit of the in-cylinder convective heat transfer coefficient is joule / (square meter·second·degree Celsius).

[0090] In this embodiment, the fuel consumption rate is the amount of fuel consumed by the internal combustion engine when completing unit effective work, and the unit of the fuel consumption rate is g / (kW·h).

[0091] The beneficial effects of the above technology are: determining the simulation time length of the internal combustion engine, and then accurately obtaining the simulation parameters of all types of combustion parameters of the internal combustion engine at each moment in the combustion time period, which is convenient for the subsequent acquisition of the difference of each type of combustion parameters.

[0092] Embodiment 4: Based on Embodiment 2, a piston internal combustion engine transient combustion simulation and test analysis system, a test module, includes:

[0093] A test submodule, for obtaining test parameters of all types of combustion parameters of the internal combustion engine at each moment in a combustion time period based on preset test equipment and basic parameters, type and fuel type of the internal combustion engine;

[0094] A difference calculation submodule, for obtaining the difference of all types of combustion parameters of the internal combustion engine at each moment in the combustion time period based on the simulation parameters and test parameters of all types of combustion parameters of the internal combustion engine at each moment in the combustion time period;

[0095] The analysis submodule is used to obtain all difference moments and all non-difference moments of each type of combustion parameter of the internal combustion engine based on the difference degree of each type of combustion parameter at all moments in the combustion time period of the internal combustion engine.

[0096] In this embodiment, the preset test equipment is a pre-set equipment for collecting test quantities of each type of combustion parameters at each moment when the internal combustion engine performs a real combustion test in a combustion time period, such as a dynamometer.

[0097] The beneficial effects of the above technology are as follows: based on the simulation parameters and test parameters of all types of combustion parameters of the internal combustion engine at each moment in the combustion time period, the difference of all types of combustion parameters of the internal combustion engine at each moment in the combustion time period is obtained, and the degree of difference of each type of combustion parameter of the internal combustion engine at each moment in the combustion time period is quantified. Then, based on the difference of each type of combustion parameter of the internal combustion engine at all moments in the combustion time period, all difference moments and all non-difference moments of each type of combustion parameter of the internal combustion engine are obtained, which facilitates the construction of the subsequent test analysis matrix of the internal combustion engine and provides reliable data support for the identification of error sources of the internal combustion engine.

[0098] Embodiment 5: Based on Embodiment 4, the transient combustion simulation and test analysis system of a piston internal combustion engine, the difference calculation submodule includes:

[0099] A preparation unit, used to treat the numerical difference between the simulation parameter and the test parameter of each type of combustion parameter of the internal combustion engine at each moment in the combustion time period as an error value of the corresponding type of combustion parameter of the internal combustion engine at the corresponding moment in the combustion time period;

[0100] The difference calculation unit is used to obtain the difference of each type of combustion parameter of the internal combustion engine at each moment in the combustion time period based on the error value of each type of combustion parameter at all moments in the combustion time period of the internal combustion engine.

[0101] The beneficial effects of the above technology are: based on the simulation parameters and test parameters of each type of combustion parameters of the internal combustion engine at each moment in the combustion time period, the error value of each type of combustion parameter of the internal combustion engine at each moment in the combustion time period is accurately obtained, and the error of each type of combustion parameter of the internal combustion engine at each moment in the combustion time period is accurately obtained, which facilitates the subsequent calculation of the difference of each type of combustion parameter of the internal combustion engine at each moment in the combustion time period.

[0102] Embodiment 6: Based on Embodiment 5, in the transient combustion simulation and test analysis system for a piston internal combustion engine, the difference calculation unit obtains the difference of each type of combustion parameter of the internal combustion engine at each moment in the combustion time period based on the error value of each type of combustion parameter at all moments in the combustion time period of the internal combustion engine, comprising:

[0103] ;

[0104] in, is the difference of the current calculation type combustion parameters of the internal combustion engine at the current calculation time within the combustion time period, α is the error value of the current calculation type combustion parameters of the internal combustion engine at the current calculation time within the combustion time period, α 0 is the mean of the error values ​​of the current calculated combustion parameters of the internal combustion engine at all times in the combustion time period, ω is the value of the test parameter of the current calculated combustion parameters of the internal combustion engine at the current calculated moment in the combustion time period, σ is the standard deviation of the error values ​​of each type of combustion parameter of the internal combustion engine at all times in the combustion time period, n is the number of all moments in the combustion time period, ln is the natural logarithm, and the value of the natural constant e is 2.718.

[0105] The beneficial effect of the above calculation is: based on the simulation parameters and test parameters of all types of combustion parameters of the internal combustion engine at each moment in the combustion time period, the difference of all types of combustion parameters of the internal combustion engine at each moment in the combustion time period is obtained, and the degree of difference of each type of combustion parameter of the internal combustion engine at each moment in the combustion time period is quantified. This embodiment gives in detail a specific method for calculating the degree of difference of the error of each type of combustion parameter of the internal combustion engine at each moment in the combustion time period compared with the overall error in the combustion time period.

[0106] Embodiment 7: Based on Embodiment 4, the transient combustion simulation and test analysis system of a piston internal combustion engine, the analysis submodule includes:

[0107] A first analysis unit is used to use the difference between the maximum value of the difference of each type of combustion parameter of the internal combustion engine at all times in the combustion time period and the standard deviation of the difference of the corresponding type of combustion parameter of the internal combustion engine at all times in the combustion time period as the difference threshold of each type of combustion parameter of the internal combustion engine;

[0108] The second analysis unit is used to determine whether the difference of each type of combustion parameters of the internal combustion engine at each moment within the combustion time period is greater than the difference threshold of the corresponding type of combustion parameters. If so, the corresponding moment is regarded as the difference moment of the corresponding type of combustion parameters of the internal combustion engine; otherwise, the corresponding moment is regarded as the non-difference moment of the corresponding type of combustion parameters of the internal combustion engine.

[0109] The beneficial effects of the above technology are: the difference of each type of combustion parameter of the internal combustion engine at all times within the combustion time period is obtained, and the difference threshold of each type of combustion parameter of the internal combustion engine is obtained, and then according to the difference threshold of each type of combustion parameter of the internal combustion engine, all difference moments and all non-difference moments of each type of combustion parameter of the internal combustion engine are obtained, which is convenient for the construction of the subsequent test analysis matrix of the internal combustion engine.

[0110] Embodiment 8: Based on Embodiment 3, a piston internal combustion engine transient combustion simulation and test analysis system, comprising:

[0111] A submodule is constructed, which is used to regard 1 as the element score value of the corresponding type of combustion parameter of the internal combustion engine at the corresponding moment in the combustion time period if each moment in the combustion time period of the internal combustion engine is a difference moment of each type of combustion parameter, and regard 0 as the element score value of the corresponding type of combustion parameter of the internal combustion engine at the corresponding moment in the combustion time period if each moment in the combustion time period of the internal combustion engine is a non-difference moment of each type of combustion parameter. Based on the element score values ​​of all types of combustion parameters of the internal combustion engine at all moments in the combustion time period, the test analysis matrix of the internal combustion engine is obtained, which is:

[0112] ;

[0113] Among them, G is the test analysis matrix of the internal combustion engine, a 1 Assign a value to the element of the cylinder pressure at the first moment in the combustion period of the internal combustion engine, a 2 Assign a value to the element of the cylinder pressure at the second moment in the combustion period of the internal combustion engine, a n Assign a score to the element of the cylinder pressure at the nth moment in the combustion time period of the internal combustion engine, where n is the number of all moments in the combustion time period, and b 1 Assign a value to the element of the cylinder temperature at the first moment in the combustion period of the internal combustion engine, b 2 Assign a value to the element of the cylinder temperature at the second moment in the combustion period of the internal combustion engine, b n Assign a value to the element of the cylinder temperature at the nth moment in the combustion period of the internal combustion engine, c 1 Assign a value to the element of the in-cylinder convection heat transfer coefficient of the internal combustion engine at the first moment in the combustion time period, c 2 Assign a value to the element of the in-cylinder convection heat transfer coefficient of the internal combustion engine at the second moment in the combustion period, c n Assign a value to the element of the cylinder convection heat transfer coefficient at the nth moment in the combustion time period of the internal combustion engine, d 1 Assign a value to the element of the fuel consumption rate of the internal combustion engine at the first moment in the combustion time period, d 2 Assign a value to the element of the fuel consumption rate of the internal combustion engine at the second moment in the combustion time period, d n Assigning a score value to the element of the fuel consumption rate of the internal combustion engine at the nth moment in the combustion time period;

[0114] The simulation influence analysis submodule is used to obtain the simulation influence of each type of simulation factor of the internal combustion engine based on the test analysis matrix of the internal combustion engine.

[0115] The beneficial effects of the above technology are: based on all difference moments and all non-difference moments of all types of combustion parameters of the internal combustion engine, the test analysis matrix of the internal combustion engine is obtained, and then based on the test analysis matrix of the internal combustion engine, the simulated influence of each type of simulation factor of the internal combustion engine is obtained. This embodiment gives in detail a specific method for constructing a test analysis matrix for an internal combustion engine.

[0116] Embodiment 9: Based on Embodiment 8, the transient combustion simulation and test analysis system of a piston internal combustion engine, the simulation influence degree analysis submodule, includes:

[0117] An acquisition unit, used for acquiring all types of simulation factors of the internal combustion engine, wherein all types of simulation factors include boundary condition factors, experimental error factors and model simplification factors;

[0118] A simulation influence degree analysis unit is used to treat the test analysis matrix of the internal combustion engine as an analysis matrix of boundary condition factors, delete the bottom row matrix in the test analysis matrix of the internal combustion engine to obtain a new matrix, and use the obtained new matrix as an analysis matrix of model simplification factors, use the number of elements with matrix elements of 1 in each row matrix of the test analysis matrix of the internal combustion engine as a reference coefficient of the corresponding row matrix, and delete the row matrix with the largest reference coefficient and the row matrix with the smallest reference coefficient in all row matrices of the test analysis matrix of the internal combustion engine to obtain a new matrix, and use the obtained new matrix as an analysis matrix of experimental error factors;

[0119] The simulation influence calculation unit is used to obtain the simulation influence of each type of simulation factor of the internal combustion engine based on the analysis matrix of boundary condition factors, the analysis matrix of model simplification factors and the analysis matrix of experimental error factors, that is:

[0120] ;

[0121] Among them, μ is the simulation influence of the current calculation type simulation factor of the internal combustion engine, is the rank of the analysis matrix of the simulation factors of the current calculation class of the internal combustion engine, is the sum of the ranks of the analysis matrices of all class simulation factors of the internal combustion engine, ε is the number of row matrices in the analysis matrix of the current calculation class simulation factors of the internal combustion engine, ln is the natural logarithm, and the value of the natural constant e is 2.718.

[0122] In this embodiment, the boundary condition factor is a boundary condition set as a factor causing combustion simulation error when performing combustion simulation on an internal combustion engine.

[0123] In this embodiment, the experimental error factor is a factor that causes actual combustion test errors during the experimental process when the actual combustion test is performed on the internal combustion engine.

[0124] In this embodiment, the model simplification factor is the establishment of a geometric model of the internal combustion engine as a factor causing combustion simulation errors when performing combustion simulation on the internal combustion engine.

[0125] The beneficial effects of the above technology are as follows: based on the test analysis matrix of the internal combustion engine, the analysis matrix of boundary condition factors, the analysis matrix of model simplification factors and the analysis matrix of experimental error factors are obtained, and then based on the analysis matrix of boundary condition factors, the analysis matrix of model simplification factors and the analysis matrix of experimental error factors, the simulation influence of each type of simulation factor of the internal combustion engine is obtained, and the possibility of each type of simulation factor of the internal combustion engine causing errors in the internal combustion engine combustion simulation process is accurately quantified.

[0126] Embodiment 10: Based on Embodiment 1, a transient combustion simulation and test analysis system for a piston internal combustion engine, an optimization module, includes:

[0127] The optimization analysis submodule is used to take the simulation factor with the greatest simulation influence among all types of simulation factors of the internal combustion engine as the prediction simulation improvement factor of the internal combustion engine;

[0128] The optimization submodule is used to treat the prediction simulation improvement factors of the internal combustion engine as the test analysis results of the internal combustion engine.

[0129] The beneficial effects of the above technology are: based on the simulated influence of all types of simulation factors of the internal combustion engine, the predicted simulation improvement factors and test analysis results of the internal combustion engine are obtained, and the error sources in the process of piston internal combustion engine combustion simulation are accurately located, which facilitates the subsequent re-optimization of the transient combustion simulation of the piston internal combustion engine.

[0130] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention, and the present invention is also intended to include these changes and modifications.

Claims

1. A transient combustion simulation and test analysis system for a piston internal combustion engine, characterized in that: include: A combustion simulation module, for obtaining simulation parameters of all types of combustion parameters of the internal combustion engine at each moment in a combustion time period based on a preset combustion simulation mode and basic parameters, type and fuel type of the internal combustion engine; A test module, for obtaining the difference of all types of combustion parameters of the internal combustion engine at each moment in the combustion time period based on the simulation parameters and the test parameters of all types of combustion parameters of the internal combustion engine at each moment in the combustion time period, and obtaining all difference moments and all non-difference moments of each type of combustion parameter of the internal combustion engine based on the difference of each type of combustion parameter at all moments in the combustion time period; A construction module is used to obtain a test analysis matrix of the internal combustion engine based on all difference moments and all non-difference moments of all types of combustion parameters of the internal combustion engine, and obtain a simulation influence degree of each type of simulation factor of the internal combustion engine based on the test analysis matrix of the internal combustion engine; An optimization module, for obtaining a prediction simulation improvement factor of the internal combustion engine based on the simulation influence of all types of simulation factors of the internal combustion engine, and obtaining a test analysis result of the internal combustion engine based on the prediction simulation improvement factor of the internal combustion engine; The building blocks include: Constructing a submodule, for, if each moment in the combustion time period of the internal combustion engine is a difference moment of each type of combustion parameter, treating 1 as the element score value of the corresponding type of combustion parameter of the internal combustion engine at the corresponding moment in the combustion time period, and if each moment in the combustion time period of the internal combustion engine is a non-difference moment of each type of combustion parameter, treating 0 as the element score value of the corresponding type of combustion parameter of the internal combustion engine at the corresponding moment in the combustion time period, and obtaining a test analysis matrix of the internal combustion engine based on the element score values ​​of all types of combustion parameters of the internal combustion engine at all moments in the combustion time period; A simulation influence degree analysis submodule is used to obtain the simulation influence degree of each type of simulation factor of the internal combustion engine based on the test analysis matrix of the internal combustion engine; The simulation impact analysis submodule includes: An acquisition unit, used for acquiring all types of simulation factors of the internal combustion engine, wherein all types of simulation factors include boundary condition factors, experimental error factors and model simplification factors; A simulation influence degree analysis unit is used to treat the test analysis matrix of the internal combustion engine as an analysis matrix of boundary condition factors, delete the bottom row matrix in the test analysis matrix of the internal combustion engine to obtain a new matrix, and use the obtained new matrix as an analysis matrix of model simplification factors, use the number of elements with matrix elements of 1 in each row matrix of the test analysis matrix of the internal combustion engine as a reference coefficient of the corresponding row matrix, and delete the row matrix with the largest reference coefficient and the row matrix with the smallest reference coefficient in all row matrices of the test analysis matrix of the internal combustion engine to obtain a new matrix, and use the obtained new matrix as an analysis matrix of experimental error factors; The simulation influence calculation unit is used to obtain the simulation influence of each type of simulation factor of the internal combustion engine based on the analysis matrix of boundary condition factors, the analysis matrix of model simplification factors and the analysis matrix of experimental error factors, that is: ; Among them, μ is the simulation influence of the current calculation type simulation factor of the internal combustion engine, is the rank of the analysis matrix of the simulation factors of the current calculation class of the internal combustion engine, is the sum of the ranks of the analysis matrices of all class simulation factors of the internal combustion engine, ε is the number of row matrices in the analysis matrix of the current calculation class simulation factors of the internal combustion engine, ln is the natural logarithm, and the value of the natural constant e is 2.

718.

2. The transient combustion simulation and test analysis system for a piston internal combustion engine according to claim 1, characterized in that: Combustion simulation module, including: Setting a submodule, used to treat the time length set by the backend on the transient combustion simulation and test analysis system of a piston internal combustion engine as a combustion time period, and obtain the basic parameters, type and fuel type of the internal combustion engine, wherein the basic parameters include the geometric parameters of the piston, cylinder and combustion chamber; A first combustion simulation submodule, for obtaining a geometric model of the internal combustion engine based on basic parameters of the internal combustion engine, and obtaining setting boundary conditions of the internal combustion engine based on a preset boundary condition database of the internal combustion engine and the basic parameters, type and fuel type of the internal combustion engine; The second combustion simulation submodule is used to obtain simulation parameters of all types of combustion parameters of the internal combustion engine at each moment in the combustion time period based on the geometric model of the internal combustion engine, setting boundary conditions and preset combustion simulation methods.

3. The transient combustion simulation and test analysis system for a piston internal combustion engine according to claim 2, characterized in that: The second combustion simulation submodule includes: A setting unit, used to set the combustion time period to a simulation time length of the internal combustion engine; The combustion simulation unit is used to obtain the simulation parameters of all types of combustion parameters of the internal combustion engine at each moment in the combustion time period based on the geometric model of the internal combustion engine, setting boundary conditions, presetting the combustion simulation method and simulation time length, wherein all types of combustion parameters include cylinder pressure, cylinder temperature, cylinder convection heat transfer coefficient and fuel consumption rate.

4. The transient combustion simulation and test analysis system for a piston internal combustion engine according to claim 2, characterized in that: Test modules, including: A test submodule, for obtaining test parameters of all types of combustion parameters of the internal combustion engine at each moment in a combustion time period based on preset test equipment and basic parameters, type and fuel type of the internal combustion engine; A difference calculation submodule, for obtaining the difference of all types of combustion parameters of the internal combustion engine at each moment in the combustion time period based on the simulation parameters and test parameters of all types of combustion parameters of the internal combustion engine at each moment in the combustion time period; The analysis submodule is used to obtain all difference moments and all non-difference moments of each type of combustion parameter of the internal combustion engine based on the difference degree of each type of combustion parameter at all moments in the combustion time period of the internal combustion engine.

5. The transient combustion simulation and test analysis system for a piston internal combustion engine according to claim 4, characterized in that: The difference calculation submodule includes: A preparation unit, used to treat the numerical difference between the simulation parameter and the test parameter of each type of combustion parameter of the internal combustion engine at each moment in the combustion time period as an error value of the corresponding type of combustion parameter of the internal combustion engine at the corresponding moment in the combustion time period; The difference calculation unit is used to obtain the difference of each type of combustion parameter of the internal combustion engine at each moment in the combustion time period based on the error value of each type of combustion parameter at all moments in the combustion time period of the internal combustion engine.

6. The transient combustion simulation and test analysis system for a piston internal combustion engine according to claim 5, characterized in that: The difference calculation unit obtains the difference of each type of combustion parameter of the internal combustion engine at each moment in the combustion time period based on the error value of each type of combustion parameter at all moments in the combustion time period of the internal combustion engine, including: ; in, is the difference of the current calculation type combustion parameters of the internal combustion engine at the current calculation moment in the combustion time period, α is the error value of the current calculation type combustion parameters of the internal combustion engine at the current calculation moment in the combustion time period, α0 is the average of the error values ​​of the current calculation type combustion parameters of the internal combustion engine at all moments in the combustion time period, ω is the value of the test parameter of the current calculation type combustion parameters of the internal combustion engine at the current calculation moment in the combustion time period, is the standard deviation of the error value of each type of combustion parameter of the internal combustion engine at all times in the combustion time period, n is the number of all times in the combustion time period, ln is the natural logarithm, and the value of the natural constant e is 2.

718.

7. The transient combustion simulation and test analysis system for a piston internal combustion engine according to claim 4, characterized in that: Analysis submodules include: A first analysis unit is used to use the difference between the maximum value of the difference of each type of combustion parameter of the internal combustion engine at all times in the combustion time period and the standard deviation of the difference of the corresponding type of combustion parameter of the internal combustion engine at all times in the combustion time period as the difference threshold of each type of combustion parameter of the internal combustion engine; The second analysis unit is used to determine whether the difference of each type of combustion parameters of the internal combustion engine at each moment within the combustion time period is greater than the difference threshold of the corresponding type of combustion parameters. If so, the corresponding moment is regarded as the difference moment of the corresponding type of combustion parameters of the internal combustion engine; otherwise, the corresponding moment is regarded as the non-difference moment of the corresponding type of combustion parameters of the internal combustion engine.

8. The transient combustion simulation and test analysis system for a piston internal combustion engine according to claim 3, characterized in that: Construct submodules to obtain the test analysis matrix of the internal combustion engine, which is: ; Among them, G is the test analysis matrix of the internal combustion engine, a1 is the element score value of the cylinder pressure of the internal combustion engine at the first moment in the combustion time period, a2 is the element score value of the cylinder pressure of the internal combustion engine at the second moment in the combustion time period, and a n is the element score value of the cylinder pressure at the nth moment in the combustion time period of the internal combustion engine, n is the number of all moments in the combustion time period, b1 is the element score value of the cylinder temperature at the first moment in the combustion time period of the internal combustion engine, b2 is the element score value of the cylinder temperature at the second moment in the combustion time period of the internal combustion engine, b n is the element score value of the cylinder temperature at the nth moment in the combustion time period of the internal combustion engine, c1 is the element score value of the cylinder convection heat transfer coefficient at the first moment in the combustion time period of the internal combustion engine, c2 is the element score value of the cylinder convection heat transfer coefficient at the second moment in the combustion time period of the internal combustion engine, c n is the element score value of the cylinder convection heat transfer coefficient of the internal combustion engine at the nth moment in the combustion time period, d1 is the element score value of the fuel consumption rate of the internal combustion engine at the first moment in the combustion time period, d2 is the element score value of the fuel consumption rate of the internal combustion engine at the second moment in the combustion time period, d n Assign a score value to the element of the fuel consumption rate of the internal combustion engine at the nth moment in the combustion time period.

9. The transient combustion simulation and test analysis system for a piston internal combustion engine according to claim 1, characterized in that: Optimization modules, including: The optimization analysis submodule is used to take the simulation factor with the greatest simulation influence among all types of simulation factors of the internal combustion engine as the prediction simulation improvement factor of the internal combustion engine; The optimization submodule is used to treat the prediction simulation improvement factors of the internal combustion engine as the test analysis results of the internal combustion engine.

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