Method, apparatus, electronic device and computer readable medium for adjusting engine torque of vehicle with optimal air-fuel ratio

Abstract

The invention discloses a method for adjusting engine torque of a vehicle with an optimal air-fuel ratio. The method comprises the following steps of: 1, acquiring a specific fuel consumption map of the vehicle; 2, finding out a plurality of theoretical working points with the minimum specific fuel consumption of the vehicle engine on the specific fuel consumption map, and respectively calculating the optimal air-fuel ratio; 3, fitting the calculated optimal air-fuel ratio into an air-fuel ratio curve, and obtaining a corresponding chart between the rotating speed of the vehicle engine at the theoretical working point and the optimal air-fuel ratio; and 4, when the current actual air-fuel ratio of the engine is smaller than the optimal air-fuel ratio, corresponding to the current actual rotating speed, in the corresponding chart during running of the vehicle, the current actual torque of the engine of the vehicle is adjusted to be the torque corresponding to the current actual rotating speed at the theoretical working point. In practical application, the fuel efficiency can be fully considered, and the cost can be reduced. The invention further relates to a device for adjusting the engine torque of the vehicle with the optimal air-fuel ratio, electronic equipment and a computer readable medium.

Description

Method, apparatus, electronic device, and computer-readable medium for adjusting engine torque of a vehicle at an optimal air-fuel ratio Technical Field

[0001] The present invention relates to a method for adjusting the engine torque of a vehicle at an optimal air-fuel ratio. In addition, the present invention also relates to a device for adjusting the engine torque of a vehicle at an optimal air-fuel ratio. Background Art

[0002] In the automotive industry, engine torque is adjusted while the vehicle is in motion to reduce energy consumption and emissions. For example, predictive eco cruise control is increasingly being used. This advanced cruise control system coordinates engine and transmission control based on road conditions to ultimately control vehicle speed.

[0003] Predictive Eco Cruise's key feature is that it uses GPS positioning and electronic horizon data to provide real-time information about the road ahead, including slope. Specifically, Predictive Eco Cruise automatically takes over engine and transmission control, accelerating before an uphill climb and decelerating before a downhill climb—in other words, controlling vehicle speed. This allows for automatic recognition throughout the entire journey, without driver intervention.

[0004] However, during the development of the present invention, the inventors discovered that the prior art suffers from at least the following problems: For example, the engine torque adjusted in predictive eco cruise mode has not adequately considered fuel efficiency, thereby increasing costs. For example, the engine torque adjusted in predictive eco cruise mode results in a relatively low air-fuel ratio, resulting in relatively high costs.

[0005] Summary of the Invention

[0006] In order to solve the above technical problems, the present invention provides a method for adjusting the engine torque of a vehicle at an optimal air-fuel ratio, thereby improving fuel efficiency and reducing costs.

[0007] According to one aspect of the present invention, a method for adjusting the engine torque of a vehicle at an optimal air-fuel ratio is provided. The method comprises the following steps:

[0008] Step 1: Obtain the vehicle's specific fuel consumption map;

[0009] Step 2: Find multiple theoretical operating points of the vehicle engine with minimum specific fuel consumption on the specific fuel consumption map and calculate the optimal air-fuel ratio for each point;

[0010] Step 3: fitting the calculated optimal air-fuel ratio into an air-fuel ratio curve and thereby obtaining a corresponding graph between the speed of the vehicle engine at the theoretical operating point and the optimal air-fuel ratio; and

[0011] Step 4: During vehicle driving, when the current actual air-fuel ratio of the engine is less than the optimal air-fuel ratio corresponding to the current actual speed in the corresponding chart, the current actual torque of the vehicle engine is adjusted to the torque corresponding to the current actual speed at the theoretical operating point.

[0012] In a preferred embodiment, it is provided that, if the vehicle itself does not have a specific fuel consumption map, the specific fuel consumption map is generated by testing the vehicle engine.

[0013] In a preferred embodiment, it is provided that the fitting is performed by means of the least squares method.

[0014] In a preferred embodiment, it is provided that when the current actual air-fuel ratio of the engine is less than the optimal air-fuel ratio corresponding to the current actual speed in the corresponding diagram, the difference between the two is used as the input of the proportional-integral controller and the torque to be adjusted is obtained as the output with the help of the proportional-integral controller.

[0015] In a preferred embodiment, it is provided that the method according to the invention can be used in predictive eco-cruise of a vehicle or as a supplement to predictive eco-cruise.

[0016] What is provided with in a preferred embodiment is that the vehicle can be a commercial vehicle. Of course, it can also be a vehicle for other purposes.

[0017] According to another aspect of the present invention, a device for adjusting the engine torque of a vehicle at an optimal air-fuel ratio is provided. The device includes the following modules:

[0018] a learning module configured to learn a specific fuel consumption map of the vehicle;

[0019] a search and calculation module configured to find a plurality of theoretical operating points of the vehicle engine with minimum specific fuel consumption on a specific fuel consumption map and calculate an optimal air-fuel ratio for each point;

[0020] - a fitting and tabulation module, the fitting and tabulation module being configured to fit the calculated optimal air-fuel ratio into an air-fuel ratio curve and thereby obtain a correspondence chart between the speed of the vehicle engine at the theoretical operating point and the optimal air-fuel ratio;

[0021] - An adjustment module configured to adjust the current actual torque of the vehicle engine to the torque corresponding to the current actual speed at the theoretical operating point when the current actual air-fuel ratio of the engine is less than the optimal air-fuel ratio corresponding to the current actual speed in the corresponding diagram during vehicle driving.

[0022] In a preferred embodiment, it is provided that the learning module is further designed to generate a specific fuel consumption map by testing the vehicle engine if the vehicle itself does not have a specific fuel consumption map.

[0023] In a preferred embodiment, it is provided that the fitting and tabulation module is also designed to carry out the fitting by means of the least squares method.

[0024] In a preferred embodiment, the adjustment module is also configured to: when the current actual air-fuel ratio of the engine is less than the optimal air-fuel ratio corresponding to the current actual speed in the corresponding chart, use the difference between the two as the input of the proportional-integral controller and use the proportional-integral controller to obtain the torque to be adjusted as the output.

[0025] In a preferred embodiment, it is provided that the device according to the invention can be used in predictive eco-cruise of a vehicle or as a supplement to predictive eco-cruise.

[0026] In a preferred embodiment, it is provided that the vehicle is a commercial vehicle.

[0027] According to another aspect of the present invention, an electronic device for adjusting the engine torque of a vehicle at an optimal air-fuel ratio is provided, the electronic device comprising:

[0028] one or more processors;

[0029] a storage device for storing one or more programs,

[0030] When one or more programs are executed by the one or more processors, the one or more processors are caused to implement the above method.

[0031] According to another aspect of the present invention, a computer-readable medium is provided, on which a computer program is stored, wherein the program implements the above method when executed by a processor. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are provided to better understand the present invention, but are not intended to limit the present invention.

[0033] FIG1 shows a flow chart of the method according to the present invention;

[0034] FIG2 shows a graph of the specific fuel consumption of a vehicle;

[0035] FIG3 shows the specific fuel consumption diagram of FIG2 in more detail, wherein a torque curve formed by connecting operating points with minimum specific fuel consumption and a torque curve formed by connecting operating points with maximum torque are plotted;

[0036] FIG4 shows discrete optimal air-fuel ratios at the operating point with minimum specific fuel consumption and discrete air-fuel ratios at the operating point with maximum torque in FIG3 ;

[0037] FIG5 shows an air-fuel ratio curve fitted by the discrete optimal air-fuel ratio of the operating point with minimum specific fuel consumption in FIG4 ;

[0038] FIG6 shows a schematic diagram of an apparatus according to the present invention;

[0039] FIG7 shows a schematic structural diagram of a computer system of a terminal device or a server suitable for implementing an embodiment of the present invention. DETAILED DESCRIPTION

[0040] The following description is directed to exemplary embodiments of the present invention with reference to the accompanying drawings, in which various details of the embodiments of the present invention are included to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be appreciated by those skilled in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present invention.

[0041] 1 shows a flow chart of a method for adjusting engine torque of a vehicle by using an air-fuel ratio according to the present invention. The method includes steps S1 to S4.

[0042] Step S1: Obtain the vehicle's specific fuel consumption map.

[0043] Step S2: Find multiple theoretical operating points of the vehicle engine with minimum specific fuel consumption on the specific fuel consumption map and calculate the optimal air-fuel ratio for each point.

[0044] Step S3: Fitting the calculated optimal air-fuel ratio into an air-fuel ratio curve and thereby obtaining a corresponding chart between the rotation speed of the vehicle engine at the theoretical operating point and the optimal air-fuel ratio.

[0045] Step S4: During vehicle driving, when the current actual air-fuel ratio of the engine is less than the optimal air-fuel ratio corresponding to the current actual speed in the corresponding chart, the current actual torque of the vehicle engine is adjusted to the torque corresponding to the current actual speed at the theoretical operating point.

[0046] Next, the contents involved in the method steps of the method proposed in the present invention will be described in detail with reference to the accompanying drawings.

[0047] As we all know, when a vehicle's engine is running, a mixture of fuel and air burns. Different torques provided by a vehicle's engine will result in different fuel and air consumption. This brings us to the concept of air-fuel ratio (AFR) in the field of motor vehicles. As the name suggests, the air-fuel ratio is the mass ratio between air and fuel in the mixture (AFR = Air / Fuel), generally expressed in grams of air consumed per gram of fuel burned. The air-fuel ratio is a critical parameter during engine operation, significantly affecting exhaust emissions, engine power, and economy. Therefore, it is necessary to find the engine's operating point with the optimal air-fuel ratio while the vehicle is driving.

[0048] According to the present invention, the optimal air-fuel ratio refers to the air-fuel ratio at the theoretical operating point of a vehicle engine that achieves the minimum specific fuel consumption (minimum fuel consumption rate) in a specific fuel consumption map. This refers to a specific fuel consumption (BSFC) map, also known as an engine-efficient fuel consumption map. The specific fuel consumption map is also known as a universal characteristic map because it depicts the variations in key engine parameters across the entire operating range, including fuel consumption rate at various speeds and loads. Figure 2 shows a specific fuel consumption map for a vehicle, where the vertical axis represents engine torque in Nm and the horizontal axis represents engine speed in rpm. The map contains several circular closed curves, each corresponding to a specific specific fuel consumption value. For example, the closed curve in the center corresponds to a value of 187 (indicating fuel consumption levels; lower values ​​indicate higher efficiency). This means that all operating points that fall on this closed curve have a specific fuel consumption value of 187, even though these operating points may have different engine torques and speeds. Furthermore, the specific fuel consumption values ​​gradually increase from the center outward.

[0049] However, when the vehicle itself does not have a specific fuel consumption map, a specific fuel consumption map is generated by testing the vehicle engine. The test, for example, includes step a) and / or step b).

[0050] Step a): Set the vehicle to manual transmission mode.

[0051] Step b): Under different road conditions, a constant vehicle speed is achieved by using different pedal positions and then the pedal position is changed to achieve different vehicle speeds, wherein the air consumption, fuel consumption, torque and speed of each engine operating point are recorded respectively.

[0052] Here, different road conditions may include uphill, downhill, and flat roads.

[0053] Because only a limited number of operating points are recorded for air consumption, fuel consumption, torque, and speed during testing, a larger number of operating points and their associated air consumption, fuel consumption, torque, and speed can be obtained through methods such as Lagrange interpolation, piecewise interpolation, or spline interpolation. Thus, through testing and interpolation algorithms, a vehicle engine's specific fuel consumption map can be generated as comprehensively as possible for various situations.

[0054] In addition to illustrating the specific fuel consumption diagram of FIG. 2 in greater detail, FIG. 3 also shows a torque curve (solid line) formed by connecting operating points with minimum specific fuel consumption, i.e., the optimal torque curve according to the present invention. For comparison, a torque curve (dashed line) formed by connecting operating points with maximum torque is also shown. This torque curve lies above the torque curve formed by connecting operating points with minimum specific fuel consumption; the engine can only be operated at operating points below this dashed line.

[0055] FIG4 shows the discrete optimal air-fuel ratios (point set a) for the operating point with minimum specific fuel consumption in FIG3 , where the vertical axis represents the air-fuel ratio and the horizontal axis represents the engine speed in rpm. Furthermore, for comparison, the discrete air-fuel ratios (point set b) for the operating point with maximum torque are also shown. The discrete point set b for the air-fuel ratios for the operating point with maximum torque is generally below the discrete point set a for the optimal air-fuel ratios for the operating point with minimum specific fuel consumption. In other words, at the same engine speed, the greater the engine torque, the smaller the air-fuel ratio. Therefore, if the air-fuel ratio is used as a parameter to adjust engine torque, a suitable air-fuel ratio must be utilized. In the present invention, this optimal air-fuel ratio is used to limit the actual torque.

[0056] Figure 5 shows an air-fuel ratio curve fitted from the discrete optimal air-fuel ratios for the operating point with minimum specific fuel consumption in Figure 4. Specifically, the discrete points are fitted into a continuous curve that best approximates all discrete points. The least squares method can be used to perform the curve fitting. Of course, other fitting methods can also be used. Thus, from this air-fuel ratio curve, a corresponding graph can be obtained between the vehicle engine speed at the theoretical operating point with minimum specific fuel consumption and the optimal air-fuel ratio.

[0057] During vehicle driving, when the current actual air-fuel ratio of the engine is less than the optimal air-fuel ratio corresponding to the current actual speed in the corresponding chart (that is, the current actual torque causes excessive fuel consumption and the torque needs to be reduced), the current actual torque of the vehicle engine is adjusted or reduced to the torque corresponding to the current actual speed at the theoretical operating point.

[0058] In a preferred embodiment of the present invention, when the current actual air-fuel ratio of the engine is less than the optimal air-fuel ratio corresponding to the current actual speed in the corresponding chart, the difference between the two is used as the input of a proportional-integral controller. The controller then generates the desired torque as output, which is then converted into a torque control command. The proportional-integral controller has both proportional and integral control functions. The former proportionally reflects system deviations. Once a system deviation occurs, proportional control immediately takes effect to reduce the deviation. A large proportional effect accelerates control and reduces error. However, an excessively large proportional effect can reduce system stability or even cause instability. The latter eliminates steady-state errors and thus improves error-freeness. Integral control is performed when errors occur, and only stops when there are no errors. The integral control output is a constant. However, integral control can reduce system stability and slow dynamic response. In the present invention, an appropriate proportional-integral controller can be used according to actual needs.

[0059] The method according to the present invention belongs to the category of Predictive Torque Management (PTM). This method can be applied to Predictive Eco Cruise (PECC) or serve as a beneficial supplement to PECC. PECC is an advanced cruise control system that coordinates engine and transmission control based on road ahead information to ultimately control speed, thereby effectively achieving energy conservation and emission reduction. PECC's key features include: GPS positioning of the vehicle and electronic horizon data simultaneously provide the vehicle with real-time information about the road ahead, including slope. PECC then combines current satellite positioning information, which accurately identifies the vehicle's position, with road information to calculate an "electronic horizon" model, automatically adapting vehicle driving to this model. The vehicle automatically controls engine and transmission matching, dynamically adjusting speed based on road ahead information to optimize engine efficiency and transmission gear control, avoiding unnecessary energy loss, and thus achieving energy conservation and emission reduction. Specifically, PECC automatically takes over engine and transmission control, accelerating before an uphill slope and decelerating before a downhill slope, effectively controlling vehicle speed. Therefore, automatic recognition is achieved throughout the entire journey, without driver intervention.

[0060] Therefore, by implementing the method according to the present invention on the basis of predictive economic cruise, on the one hand, many advantages of predictive economic cruise can be achieved, and on the other hand, the optimal air-fuel ratio can be used to adjust the engine torque and thus further improve vehicle fuel consumption and reduce costs.

[0061] The method according to the invention can preferably be used in a commercial vehicle.

[0062] Figure 6 shows a schematic diagram of an apparatus 1 according to the present invention, wherein the apparatus comprises: an acquisition module 2, the acquisition module being configured to acquire a specific fuel consumption diagram of a vehicle; a finding and calculation module 3, the finding and calculation module being configured to find a plurality of theoretical operating points of a vehicle engine with minimum specific fuel consumption on the specific fuel consumption diagram and respectively calculate the optimal air-fuel ratio; a fitting and tabulation module 4, the fitting and tabulation module being configured to fit the calculated optimal air-fuel ratio into an air-fuel ratio curve and thereby obtain a corresponding chart between the speed of the vehicle engine at the theoretical operating point and the optimal air-fuel ratio; an adjustment module 5, the adjustment module being configured to: during vehicle driving, when the current actual air-fuel ratio of the engine is less than the optimal air-fuel ratio corresponding to the current actual speed in the corresponding chart, adjust the current actual torque of the vehicle engine to the torque corresponding to the current actual speed at the theoretical operating point.

[0063] Preferably, the learning module 2 is further configured to generate a specific fuel consumption map by testing the vehicle engine when the vehicle itself does not have a specific fuel consumption map.

[0064] Preferably, the fitting and tabulation module 4 is further configured to implement the fitting by a least squares method.

[0065] Preferably, the adjustment module 5 is also configured to: when the current actual air-fuel ratio of the engine is less than the optimal air-fuel ratio corresponding to the current actual speed in the corresponding chart, use the difference between the two as the input of the proportional-integral controller and use the proportional-integral controller to obtain the torque to be adjusted as the output.

[0066] Furthermore, the other preferred embodiments of the method according to the invention also apply to the device according to the invention.

[0067] 7, which shows a schematic diagram of the structure of a computer system 700 suitable for implementing an embodiment of the present invention. The terminal device shown in FIG7 is merely an example and should not limit the functions and scope of use of the embodiment of the present invention.

[0068] As shown in FIG7 , a computer system 700 includes a central processing unit (CPU) 701, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 702 or a program loaded from a storage unit 708 into a random access memory (RAM) 703. Various programs and data required for the operation of the system 700 are also stored in the RAM 703. The CPU 701, the ROM 702, and the RAM 703 are connected to each other via a bus 704. An input / output (I / O) interface 705 is also connected to the bus 704.

[0069] The following components are connected to the I / O interface 705: an input section 706 including a keyboard, a mouse, and the like; an output section 707 including devices such as a cathode ray tube (CRT), a liquid crystal display (LCD), and a speaker; a storage section 708 including a hard disk; and a communication section 709 including a network interface card such as a LAN card or a modem. The communication section 709 performs communication processing via a network such as the Internet. A drive 710 is also connected to the I / O interface 705 as needed. A removable medium 711, such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory, is installed in the drive 710 as needed, so that computer programs read therefrom can be installed into the storage section 708 as needed.

[0070] In particular, according to the embodiments disclosed in the present invention, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, the embodiments disclosed in the present invention include a computer program product comprising a computer program carried on a computer-readable medium, the computer program comprising program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network via the communication section 709, and / or installed from a removable medium 711. When the computer program is executed by the central processing unit (CPU) 701, the above-mentioned functions defined in the system of the present invention are executed.

[0071] It should be noted that the computer-readable medium described in the present invention can be a computer-readable signal medium or a computer-readable storage medium, or any combination thereof. A computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of computer-readable storage media can include, but are not limited to, an electrical connection having one or more conductors, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In the present invention, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. In the present invention, a computer-readable signal medium can include a data signal propagated in baseband or as part of a carrier wave, carrying computer-readable program code. This propagated data signal can take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium that can transmit, propagate, or transport a program for use by or in conjunction with an instruction execution system, apparatus, or device. Program code embodied on a computer-readable medium may be transmitted using any suitable medium, including but not limited to wireless, wireline, optical fiber cable, RF, or any suitable combination thereof.

[0072] The flowcharts and block diagrams in the accompanying drawings illustrate the possible implementation architecture, functions and operations of the systems, methods and computer program products according to various embodiments of the present invention. In this regard, each box in the flowchart or block diagram can represent a module, program segment, or a part of code, and the above-mentioned module, program segment, or a part of code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram or flowchart, and the combination of boxes in the block diagram or flowchart, can be implemented with a dedicated hardware-based system that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0073] The modules described in the embodiments of the present invention may be implemented via software or hardware. The modules described may also be located within a processor. For example, a processor may be described as comprising a learning module, a search and calculation module, a fitting and tabulation module, and an adjustment module. The names of these modules do not, in some cases, limit the modules themselves. For example, the learning module may also be described as a "module for learning a specific fuel consumption map."

[0074] As another aspect, the present invention further provides a computer-readable medium, which may be included in the device described in the above embodiment; or may exist independently and not be assembled into the device. The computer-readable medium carries one or more programs, and when the one or more programs are executed by a device, the device includes the following steps: obtaining a vehicle specific fuel consumption map; finding multiple theoretical operating points with minimum specific fuel consumption of the vehicle engine on the specific fuel consumption map and calculating the optimal air-fuel ratio for each point; fitting the calculated optimal air-fuel ratio into an air-fuel ratio curve and thereby obtaining a corresponding chart between the speed of the vehicle engine at the theoretical operating point and the optimal air-fuel ratio; and during vehicle driving, when the current actual air-fuel ratio of the engine is less than the optimal air-fuel ratio corresponding to the current actual speed in the corresponding chart, adjusting the current actual torque of the vehicle engine to the torque corresponding to the current actual speed at the theoretical operating point.

[0075] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may occur depending on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A method for adjusting the engine torque of a vehicle at an optimal air-fuel ratio, characterized in that: The method comprises: Step 1: Obtaining a specific fuel consumption map of a vehicle (S1); Step 2: Find multiple theoretical operating points of the vehicle engine with minimum specific fuel consumption on the specific fuel consumption map and calculate the optimal air-fuel ratio for each point (S2); Step 3: fitting the calculated optimal air-fuel ratio into an air-fuel ratio curve and thereby obtaining a corresponding chart between the speed of the vehicle engine at the theoretical operating point and the optimal air-fuel ratio (S3); and Step 4: During vehicle driving, when the current actual air-fuel ratio of the engine is less than the optimal air-fuel ratio corresponding to the current actual speed in the corresponding chart, the current actual torque of the vehicle engine is adjusted to the torque corresponding to the current actual speed at the theoretical operating point (S4).

2. The method according to claim 1, characterized in that When the vehicle itself does not have a specific fuel consumption map, a specific fuel consumption map is generated by testing the vehicle engine.

3. The method according to claim 1 or 2, characterized in that The fitting is performed by the least squares method.

4. The method according to claim 1 or 2, characterized in that When the current actual air-fuel ratio of the engine is less than the optimal air-fuel ratio corresponding to the current actual speed in the corresponding chart, the difference between the two is used as the input of the proportional-integral controller and the proportional-integral controller is used to obtain the adjusted torque as the output.

5. The method according to claim 1 or 2, characterized in that The method can be applied in predictive economic cruise control of a vehicle or as a supplement to predictive economic cruise control.

6. The method according to claim 1 or 2, characterized in that The vehicle is a commercial vehicle.

7. A device for adjusting the engine torque of a vehicle at an optimal air-fuel ratio, characterized in that The device comprises: a learning module configured to learn a specific fuel consumption map of the vehicle; a search and calculation module configured to find a plurality of theoretical operating points of the vehicle engine with minimum specific fuel consumption on a specific fuel consumption map and calculate an optimal air-fuel ratio for each point; - a fitting and tabulation module, the fitting and tabulation module being configured to fit the calculated optimal air-fuel ratio into an air-fuel ratio curve and thereby obtain a correspondence chart between the speed of the vehicle engine at the theoretical operating point and the optimal air-fuel ratio; - An adjustment module configured to adjust the current actual torque of the vehicle engine to the torque corresponding to the current actual speed at the theoretical operating point when the current actual air-fuel ratio of the engine is less than the optimal air-fuel ratio corresponding to the current actual speed in the corresponding diagram during vehicle driving.

8. The device according to claim 7, characterized in that The learning module is further configured to generate a specific fuel consumption map by testing an engine of the vehicle when the vehicle itself does not have a specific fuel consumption map.

9. The device according to claim 7 or 8, characterized in that The fitting and tabulation module is further configured to implement the fitting by a least squares method.

10. The device according to claim 7 or 8, characterized in that The adjustment module is also configured to: when the current actual air-fuel ratio of the engine is less than the optimal air-fuel ratio corresponding to the current actual speed in the corresponding chart, use the difference between the two as the input of the proportional-integral controller and use the proportional-integral controller to obtain the torque to be adjusted as the output.

11. The device according to claim 7 or 8, characterized in that The device can be applied in the predictive economic cruise of the vehicle or as a supplement to the predictive economic cruise.

12. The device according to claim 7 or 8, characterized in that The vehicle is a commercial vehicle.

13. An electronic device for adjusting the engine torque of a vehicle at an optimal air-fuel ratio, characterized in that include: one or more processors; a storage device for storing one or more programs, When the one or more programs are executed by the one or more processors, the one or more processors implement the method according to any one of claims 1 to 6.

14. A computer-readable medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to any one of claims 1 to 6 is implemented.

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