Method and system for determining optimal economic line of automobile engine

Abstract

The invention provides a method and system for determining the optimal economic line of an automobile engine, and relates to the technical field of engines. The method includes: acquiring engine data of an automobile; determining the maximum power of the engine based on the external characteristic data, and determining a plurality of power points and a plurality of rotating speed points; obtaining a torque point corresponding to each rotating speed point based on the plurality of rotating speed points under each determined power point; traversing the plurality of power points, and determining combinations of a plurality of rotating speed points and torque points; the obtained combinations of the multiple rotating speed points and the torque points are subjected to interpolation of universal characteristics, and the oil consumption rate of each combination is obtained; and taking the combination of the rotating speed point with the lowest oil consumption rate corresponding to each power point and the torque point, and drawing an optimal economic line. According to the method, under the condition that the whole vehicle cost is not increased, the economical efficiency, convenience and accuracy of determining the optimal economic line are well balanced, and determining methods of the optimal economic lines of different engines are unified.

Description

Technical Field

[0001] The invention belongs to the technical field of engines, and in particular relates to a method and a system for determining an optimal economic line of an automobile engine. Background Art

[0002] In recent years, with the increasing emphasis on energy conservation, environmental protection, energy consumption and emissions, and the increasing fuel consumption requirements of consumers for fuel vehicles, reducing fuel consumption has become an urgent and critical issue for major traditional automakers. The best economy line of an automobile engine usually refers to the area where the engine achieves the lowest fuel consumption at a specific speed and load. It can help optimize engine performance, improve fuel efficiency, reduce emissions, and ultimately achieve better economy.

[0003] There are many methods for determining the optimal economy line of an engine in the prior art. For example, in a Chinese invention patent application with the applicant being Chery Automobile Co., Ltd., the publication number being CN 113609624 A, and the name being a method, device, equipment and medium for determining engine gear position, it is disclosed that the optimal economy line of an engine can be determined in the following manner: first, generate multiple equal power lines and equal efficiency regions of the engine; then, determine the intersection points of the equal power lines and the equal efficiency regions; finally, determine the optimal economy line of the engine based on the connection lines of the multiple intersection points. The above method for determining the optimal economy line of an engine is relatively cumbersome, and requires determining the intersection points of the equal power lines and the equal efficiency regions, and there are still certain deficiencies in terms of speed and accuracy.

[0004] In addition, in order to improve the accuracy of the optimal economic curve, there is also a self-learning method of the optimal economic curve in the prior art. For example, in the Chinese invention patent application with the publication number CN 118395694 A and the name of the self-learning method and system for the optimal economic curve of the series power generation of the hybrid vehicle, it is disclosed that: a fixed optimal economic curve is fitted according to the universal characteristic curve of the engine and the efficiency distribution of each working point of the motor, as the target working point of the engine under each required power generation in the series mode. On the target torque of the engine working at the working point on the preset optimal economic curve, the test torque that varies with time is added so that the engine adjusts the test working point that varies with time on the target equal power line based on the final torque; the corresponding fuel consumption rate that varies with time is obtained at the test working point that varies with time; in the fuel consumption rate that varies with time, the minimum value of the fuel consumption rate is determined, and the test working point of the engine corresponding to the minimum value is determined; based on the test working point corresponding to the minimum value, the preset optimal economic curve is self-learned and corrected to obtain the corrected optimal economic curve of the hybrid vehicle. The above scheme can correct factors such as deviations that affect the optimal economic curve, but it requires additional costs. Summary of the invention

[0005] In order to overcome the shortcomings of the above-mentioned prior art, the present invention provides a method and system for determining the optimal economy line of an automobile engine. Without increasing the cost of the entire vehicle, it well balances the economy, convenience and accuracy of determining the optimal economy line, unifies the methods for determining the optimal economy lines of different engines, deeply explores the fuel consumption reduction space in various control strategies, achieves the goal of reducing fuel consumption, and provides assistance for the formulation of possible subsequent simulation strategies.

[0006] To achieve the above objectives, one or more embodiments of the present invention provide the following technical solutions:

[0007] A first aspect of the present invention provides a method for determining an optimal economy line of an automobile engine.

[0008] The method for determining the optimal economic line of an automobile engine comprises the following steps:

[0009] Obtain the engine data of the car, including the universal characteristic data and external characteristic data of the engine;

[0010] Determining the maximum power of the engine based on the external characteristic data;

[0011] Determine a plurality of power points with a preset initial engine power as a starting point, a maximum power as an end point, and a first set interval;

[0012] Based on the engine speed range in the universal characteristic data, a plurality of speed points are determined with a preset engine initial speed as a starting point, a maximum speed as an end point, and a second set interval;

[0013] At each determined power point, based on multiple speed points, a torque point corresponding to each speed point is obtained; traversing multiple power points, a combination of multiple speed points and torque points is determined;

[0014] Interpolate the universal characteristics of the obtained combinations of multiple speed points and torque points to obtain the fuel consumption rate of each combination;

[0015] Take the combination of the speed point and torque point with the lowest fuel consumption rate corresponding to each power point and draw the best economic line.

[0016] As an optional technical solution, the universal characteristic data of the engine include speed, torque and fuel consumption rate, and the external characteristic data include speed and external characteristic torque.

[0017] As an optional technical solution, the maximum power of the engine is determined based on the external characteristic data. The specific method is as follows:

[0018] According to the external characteristic power formula, combined with the speed and external characteristic torque in the external characteristic data, multiple external characteristic power values ​​are calculated, and the maximum value among them is the maximum power of the engine;

[0019] The external characteristic power formula is:

[0020] P e =Ttq×n / 9550,

[0021] Among them, P e is power, n is speed, and Ttq is external characteristic torque.

[0022] As an optional technical solution, as the power point becomes larger, when looking for the combination of speed point and torque point with the lowest fuel consumption rate corresponding to the power point, it is necessary to comply with the principle that as the speed increases, the torque also increases, and eliminate the combinations that do not meet the principle.

[0023] As an optional technical solution, take the combination of the speed point and torque point with the lowest fuel consumption rate corresponding to each power point to draw the best economic line, which is:

[0024] The combination of the speed point and torque point with the lowest fuel consumption rate corresponding to each power point is used as the speed torque combination with the optimal fuel consumption at each power point;

[0025] Connect the speed-torque combination for optimal fuel consumption at each power point to draw the best economy line.

[0026] As an optional technical solution, the optimal economic line is drawn based on MATLAB software.

[0027] As an optional technical solution, the acquired automobile engine data is also pre-processed, specifically including:

[0028] Data cleaning;

[0029] Process the universal characteristic data into three columns according to speed, torque and fuel consumption rate;

[0030] The external characteristic data is processed into two columns according to the rotation speed and the external characteristic torque.

[0031] A second aspect of the present invention provides a system for determining an optimal economy line of an automobile engine.

[0032] The system for determining the best economic line of automobile engine includes:

[0033] The data acquisition module is configured to: acquire engine data of the vehicle, including universal characteristic data and external characteristic data of the engine;

[0034] The maximum power determination module is configured to: determine the maximum power of the engine based on the external characteristic data;

[0035] The power point determination module is configured to: determine a plurality of power points at a first set interval with a preset initial engine power as a starting point and a maximum power as an end point;

[0036] The speed point determination module is configured to: determine a plurality of speed points at a second set interval based on the speed range of the engine in the universal characteristic data, with a preset initial engine speed as a starting point, a maximum speed as an end point, and a second set interval;

[0037] A plurality of combination calculation modules are configured to: obtain a torque point corresponding to each speed point based on a plurality of speed points at each determined power point; traverse a plurality of power points to determine a combination of a plurality of speed points and torque points;

[0038] The fuel consumption rate calculation module is configured to: interpolate the universal characteristics of the obtained combinations of multiple speed points and torque points to obtain the fuel consumption rate of each combination;

[0039] The optimal combination drawing module is configured to draw the optimal economic line by taking the combination of the speed point and the torque point with the lowest fuel consumption rate corresponding to each power point.

[0040] The third aspect of the present invention provides a computer-readable storage medium having a program stored thereon, which, when executed by a processor, implements the steps in the method for determining the optimal economy line of an automobile engine as described in the first aspect of the present invention.

[0041] The fourth aspect of the present invention provides an electronic device, including a memory, a processor and a program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps in the method for determining the optimal economic line of an automobile engine as described in the first aspect of the present invention are implemented.

[0042] One or more of the above technical solutions have the following beneficial effects:

[0043] The present invention provides a method and system for determining the optimal economy line of an automobile engine, which well balances the economy, convenience and accuracy of determining the optimal economy line without increasing the cost of the entire vehicle. The present invention uses MATLAB software to create an application program, collects engine data of a prototype vehicle under development, and inputs the collected data into the application program after preprocessing. The application program can quickly draw the optimal economy line of the engine, unify the determination methods of the optimal economy lines of different engines, deeply explore the fuel consumption reduction space in various control strategies, achieve the goal of reducing fuel consumption, and provide assistance for the formulation of subsequent possible simulation strategies.

[0044] After the maximum power of the engine is determined based on the external characteristic data, the present invention determines multiple power points with the preset initial power of the engine as the starting point, the maximum power as the end point, and the first set interval; based on the speed range of the engine in the universal characteristic data, multiple speed points are determined with the preset initial speed of the engine as the starting point, the maximum speed as the end point, and the second set interval, and then the corresponding multiple speed points and torque point combinations under each power point are determined, and the combination of the speed point and torque point with the lowest fuel consumption rate corresponding to each power point is found to draw the best economic line. The overall solution is simple, convenient, easy to implement, and can obtain an accurate best economic line. The best economic line can be quickly obtained for different engines, and the economy can be taken into account.

[0045] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0047] Figure 1 The figure is a flow chart of a method according to an embodiment of the present invention.

[0048] Figure 2 This is an interface diagram for an application created based on MATLAB.

[0049] Figure 3 This is the engine universal characteristic data diagram after processing.

[0050] Figure 4 This is the processed engine external characteristic data diagram.

[0051] Figure 5 This is the optimal economic line of the engine finally drawn. DETAILED DESCRIPTION

[0052] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0053] It should be noted that the terms used herein are for describing specific embodiments only and are not intended to be limiting of exemplary embodiments according to the present invention.

[0054] In the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0055] Embodiment 1

[0056] This embodiment discloses a method for determining the optimal economy line of an automobile engine. An application is created using MATLAB software to collect engine data of a prototype vehicle under development. The collected data is pre-processed and then input into the application. The application can quickly draw the optimal economy line of the engine. This method can unify the determination methods of the optimal economy lines of different engines, deeply explore the fuel consumption reduction space in various control strategies, and achieve the goal of reducing fuel consumption.

[0057] like Figure 1 As shown, the method for determining the optimal economy line of an automobile engine comprises the following steps:

[0058] Obtain the engine data of the car, including the universal characteristic data and external characteristic data of the engine;

[0059] Determining the maximum power of the engine based on the external characteristic data;

[0060] Determine a plurality of power points with a preset initial engine power as a starting point, a maximum power as an end point, and a first set interval;

[0061] Based on the engine speed range in the universal characteristic data, a plurality of speed points are determined with a preset engine initial speed as a starting point, a maximum speed as an end point, and a second set interval;

[0062] At each determined power point, based on multiple speed points, a torque point corresponding to each speed point is obtained; traversing multiple power points, a combination of multiple speed points and torque points is determined;

[0063] Interpolate the universal characteristics of the obtained combinations of multiple speed points and torque points to obtain the fuel consumption rate of each combination;

[0064] Take the combination of the speed point and torque point with the lowest fuel consumption rate corresponding to each power point and draw the best economic line.

[0065] In some embodiments, the universal characteristic data of the engine include speed, torque and fuel consumption rate, and the external characteristic data include speed and external characteristic torque.

[0066] In some embodiments, the maximum power of the engine is determined based on the external characteristic data, and the specific method is as follows:

[0067] According to the external characteristic power formula, combined with the speed and external characteristic torque in the external characteristic data, multiple external characteristic power values ​​are calculated, and the maximum value among them is the maximum power of the engine;

[0068] The external characteristic power formula is:

[0069] P e =Ttq×n / 9550,

[0070] Among them, P e is power, n is speed, and Ttq is external characteristic torque.

[0071] In some embodiments, as the power point becomes larger, when looking for a combination of speed point and torque point with the lowest fuel consumption rate corresponding to the power point, it is necessary to comply with the principle that as the speed increases, the torque also increases, and eliminate combinations that do not meet the principle.

[0072] In some embodiments, the combination of the speed point and the torque point with the lowest fuel consumption rate corresponding to each power point is taken to draw the best economic line, which is specifically:

[0073] The combination of the speed point and torque point with the lowest fuel consumption rate corresponding to each power point is used as the speed torque combination with the optimal fuel consumption at each power point;

[0074] Connect the speed-torque combination for optimal fuel consumption at each power point to draw the best economy line.

[0075] In some embodiments, the optimal economic line is drawn based on MATLAB software.

[0076] In some embodiments, the obtained automobile engine data is preprocessed, specifically including:

[0077] Data cleaning;

[0078] Process the universal characteristic data into three columns according to speed, torque and fuel consumption rate;

[0079] The external characteristic data is processed into two columns according to the rotation speed and the external characteristic torque.

[0080] Next, the technical solution of this embodiment will be explained in detail with reference to the accompanying drawings.

[0081] The purpose of this embodiment is to provide a method for quickly drawing the optimal economic line of an automobile engine using MATLAB, so as to provide assistance for the formulation of subsequent possible simulation strategies without increasing the cost of the entire vehicle.

[0082] To achieve the above purpose, the main steps of this embodiment are as follows:

[0083] (1) Create applications using MATLAB:

[0084] Based on MATLAB software, build an application for drawing the optimal economic line of a car engine.

[0085] (2) Collect vehicle engine data:

[0086] Collect the engine data that has been tested, including the engine's universal characteristics and external characteristics data.

[0087] (3) Preprocessing of engine data:

[0088] Clean and process the collected data to ensure that the data is suitable for operation in MATLAB.

[0089] The universal characteristics after data processing should contain three columns, namely, speed (n) in rpm, torque (Tq) in Nm, and fuel consumption rate (FUELCOSP) in g / kWh, such as Figure 3 The figure shows a part of the universal characteristic data; the processed external characteristic data contains two columns, namely the speed (n) and the external characteristic torque (Ttq), as shown in the figure below. Figure 4 shown.

[0090] (4) Input the processed engine data into the application:

[0091] Enter the processed engine data into the corresponding position of the application and set the parameters of the application. Figure 2 As shown, Figure 2 This is the interface diagram of an application created based on MATLAB. There are multiple options on the interface, including: input EC, input WOT, contour line definition, display auxiliary points, draw the best economic line, input OP, and draw operating condition points.

[0092] in:

[0093] Input EC, used to input universal characteristic data, including three columns of data: speed (n), torque (Tq) and fuel consumption rate (FUELCOSP);

[0094] Input WOT, used to input external characteristic data, including two columns of data: speed (n), external characteristic torque (Ttq);

[0095] Contour definition, used to define the density of contour lines;

[0096] Display auxiliary points, used to select whether to display the process auxiliary points determined by the economic line;

[0097] Draw the best economic line, which is used to draw the engine specific fuel consumption MAP and economic line;

[0098] Input OP, used to input the operating point, including two columns of data: speed and torque;

[0099] Draw the operating condition points to verify the actual operating conditions and the economic line.

[0100] In this embodiment, the above-mentioned setting of various parameters of the application program specifically includes setting the contour line definition, displaying auxiliary points, etc.

[0101] (5) Determine the optimal economic line:

[0102] The application will find the points corresponding to the lowest fuel consumption rate on the universal characteristic curve and the external characteristic curve, and connect them to form the best economy line.

[0103] The operation logic is:

[0104] According to the external characteristics of speed and torque, and formula P e =Ttq×n / 9550, and get the maximum power P(max);

[0105] The power point to be plotted is determined to be [5:5:P(max)], that is, in this embodiment, the preset initial power of the engine is 5, and the first set interval is also 5, so that multiple power points are determined;

[0106] Based on the universal characteristic data, the engine speed range is determined to be 1000-4000, and the speed points for drawing are determined to be [1000:500:4000] according to the speed range of the universal characteristic, that is, in this embodiment, the second setting interval is 500; the multiple speed points are 1000, 1500, 2000, 2500, 3000, 3500, and 4000 respectively;

[0107] Knowing the above power point and speed point, through the formula P e =Ttq×n / 9550, it can be obtained that at each determined power point, based on multiple speed points, a torque point corresponding to each speed point is obtained; traversing multiple power points, a combination of multiple speed points and torque points is determined;

[0108] By interpolating the obtained combinations of speed and torque into the universal characteristics, the fuel consumption rate of each combination can be obtained;

[0109] Take the speed and torque combination with the lowest fuel consumption rate corresponding to each power point and draw the best economic line.

[0110] It can be understood that the above-obtained combination of each speed and torque is interpolated into universal characteristics to obtain the fuel consumption rate of each combination. The specific process is:

[0111] The engine universal characteristic diagram uses the speed n as the horizontal coordinate and the torque Tq as the vertical coordinate. Many FUELCOSP curves with equal fuel consumption rates are drawn on the diagram to form the engine universal characteristics. According to the combination of speed and torque, the fuel consumption rate of the combination can be determined on the universal special effects diagram (using the interpolation method). For each power point, only the combination with the lowest fuel consumption rate is taken, and the following description principles must be met: When drawing, as the power point becomes larger, when looking for the speed-torque combination with the optimal fuel consumption corresponding to each power point, it is necessary to comply with the principle that as the speed increases, the torque also increases, and inappropriate combinations should be eliminated. This is to bring the best economy close to the area with the lowest fuel consumption of the engine. The data of the optimal economic line can be derived according to demand later, such as Figure 5 shown.

[0112] exist Figure 5 In the figure, the horizontal axis is the speed in rpm; the vertical axis is the torque in Nm; the figure also includes multiple fuel consumption rate curves, such as 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, 300, in g / kWh. The dotted line represents the best economic line. The combination of speed and torque with the lowest fuel consumption rate at each power is displayed as a point on the universal characteristic diagram. The dotted line formed by multiple points is the best economic line; the thick black solid line on the top represents the external characteristic.

[0113] like Figure 2 As shown, in specific applications:

[0114] 1. Open the application created based on MATLAB, click Input EC in the interface diagram, and input the processed engine universal characteristic data;

[0115] 2. Click Enter WOT to input the processed engine external characteristic data;

[0116] 3. Set the parameters of the application, change the density of contour lines, and choose whether to display auxiliary points;

[0117] 4. Click to draw the best economic line to get the best economic line of the engine.

[0118] Embodiment 2

[0119] This embodiment discloses a system for determining an optimal economy line of an automobile engine.

[0120] The system for determining the best economic line of automobile engine includes:

[0121] The data acquisition module is configured to: acquire engine data of the vehicle, including universal characteristic data and external characteristic data of the engine;

[0122] The maximum power determination module is configured to: determine the maximum power of the engine based on the external characteristic data;

[0123] The power point determination module is configured to: determine a plurality of power points at a first set interval with a preset initial engine power as a starting point and a maximum power as an end point;

[0124] The speed point determination module is configured to: determine a plurality of speed points at a second set interval based on the speed range of the engine in the universal characteristic data, with a preset initial engine speed as a starting point, a maximum speed as an end point, and a second set interval;

[0125] A plurality of combination calculation modules are configured to: obtain a torque point corresponding to each speed point based on a plurality of speed points at each determined power point; traverse a plurality of power points to determine a combination of a plurality of speed points and torque points;

[0126] The fuel consumption rate calculation module is configured to: interpolate the universal characteristics of the obtained combinations of multiple speed points and torque points to obtain the fuel consumption rate of each combination;

[0127] The optimal combination drawing module is configured to draw the optimal economic line by taking the combination of the speed point and the torque point with the lowest fuel consumption rate corresponding to each power point.

[0128] Embodiment 3

[0129] The purpose of this embodiment is to provide a computer-readable storage medium.

[0130] A computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps in the method for determining the optimal economy line of an automobile engine as described in Example 1 of the present disclosure.

[0131] Embodiment 4

[0132] The purpose of this embodiment is to provide an electronic device.

[0133] An electronic device includes a memory, a processor, and a program stored in the memory and executable on the processor. When the processor executes the program, the steps in the method for determining the optimal economy line of an automobile engine as described in Example 1 of the present disclosure are implemented.

[0134] The steps involved in the apparatuses of the above embodiments 2, 3 and 4 correspond to the method embodiment 1, and the specific implementation methods can refer to the relevant description part of embodiment 1. The term "computer-readable storage medium" should be understood as a single medium or multiple media including one or more instruction sets; it should also be understood to include any medium that can store, encode or carry an instruction set for execution by a processor and enable the processor to execute any method in the present invention.

[0135] Those skilled in the art should understand that the modules or steps of the present invention described above can be implemented by a general-purpose computer device, or alternatively, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. The present invention is not limited to any specific combination of hardware and software.

[0136] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A method for determining the optimal economy line of an automobile engine, characterized in that: The following steps are involved: Obtain the engine data of the car, including the universal characteristic data and external characteristic data of the engine; Determining the maximum power of the engine based on the external characteristic data; Determine a plurality of power points with a preset initial engine power as a starting point, a maximum power as an end point, and a first set interval; Based on the engine speed range in the universal characteristic data, a plurality of speed points are determined with a preset engine initial speed as a starting point, a maximum speed as an end point, and a second set interval; At each determined power point, based on multiple speed points, a torque point corresponding to each speed point is obtained; Traverse multiple power points and determine the combination of multiple speed points and torque points; Interpolate the universal characteristics of the obtained combinations of multiple speed points and torque points to obtain the fuel consumption rate of each combination; Take the combination of the speed point and torque point with the lowest fuel consumption rate corresponding to each power point and draw the best economic line.

2. The method for determining the optimal economy line of an automobile engine according to claim 1, characterized in that: The universal characteristic data of the engine include rotation speed, torque and fuel consumption rate, and the external characteristic data include rotation speed and external characteristic torque.

3. The method for determining the optimal economy line of an automobile engine according to claim 2, characterized in that: The maximum power of the engine is determined based on the external characteristic data. The specific method is: According to the external characteristic power formula, combined with the speed and external characteristic torque in the external characteristic data, multiple external characteristic power values ​​are calculated, and the maximum value among them is the maximum power of the engine; The external characteristic power formula is: P e =Ttq×n / 9550, Among them, P e is power, n is speed, and Ttq is external characteristic torque.

4. The method for determining the optimal economy line of an automobile engine according to claim 1, characterized in that: As the power point becomes larger, when looking for the combination of speed point and torque point with the lowest fuel consumption rate corresponding to the power point, it is necessary to comply with the principle that as the speed increases, the torque also increases, and eliminate the combinations that do not meet the principle.

5. The method for determining the optimal economy line of an automobile engine according to claim 1, characterized in that: Take the combination of the speed point and torque point with the lowest fuel consumption rate corresponding to each power point and draw the best economic line, which is: The combination of the speed point and torque point with the lowest fuel consumption rate corresponding to each power point is used as the speed torque combination with the optimal fuel consumption at each power point; Connect the speed-torque combination for optimal fuel consumption at each power point to draw the best economy line.

6. The method for determining the optimal economy line of an automobile engine according to claim 1, characterized in that: The optimal economic line is drawn based on MATLAB software.

7. The method for determining the optimal economy line of an automobile engine according to claim 1, characterized in that: It also includes preprocessing the acquired automobile engine data, including: Data cleaning; Process the universal characteristic data into three columns according to speed, torque and fuel consumption rate; The external characteristic data is processed into two columns according to the rotation speed and the external characteristic torque.

8. The system for determining the optimal economic line of an automobile engine is characterized by: include: The data acquisition module is configured to: acquire engine data of the vehicle, including universal characteristic data and external characteristic data of the engine; The maximum power determination module is configured to: determine the maximum power of the engine based on the external characteristic data; The power point determination module is configured to: determine a plurality of power points at a first set interval with a preset initial engine power as a starting point and a maximum power as an end point; The speed point determination module is configured to: determine a plurality of speed points at a second set interval based on the speed range of the engine in the universal characteristic data, with a preset initial engine speed as a starting point, a maximum speed as an end point, and a second set interval; A plurality of combined calculation modules are configured to: at each determined power point, based on a plurality of speed points, obtain a torque point corresponding to each speed point; Traverse multiple power points and determine the combination of multiple speed points and torque points; The fuel consumption rate calculation module is configured to: interpolate the universal characteristics of the obtained combinations of multiple speed points and torque points to obtain the fuel consumption rate of each combination; The optimal combination drawing module is configured to draw the optimal economic line by taking the combination of the speed point and the torque point with the lowest fuel consumption rate corresponding to each power point.

9. A computer-readable storage medium having a program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method for determining the optimal economy line of an automobile engine as described in any one of claims 1 to 7 are implemented.

10. An electronic device comprising a memory, a processor, and a program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the steps in the method for determining the optimal economy line of an automobile engine as described in any one of claims 1-7 are implemented.

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