A control method and device of a lean-burn engine, a vehicle and a storage medium

Abstract

The application discloses a control method and device of a lean-burn engine, a vehicle and a storage medium, and the method comprises the following steps: determining the corresponding required intake air quantity according to the corrected required output torque; determining the air quantity compliance factor according to the actual intake air quantity and the required intake air quantity; when the air quantity compliance factor is less than a first set threshold value or greater than a second set threshold value, determining the first required fuel injection quantity according to the actual intake air quantity and the corrected required output torque; and when the air quantity compliance factor is greater than or equal to the first set threshold value and less than or equal to the second set threshold value, determining the second required fuel injection quantity according to the actual fuel-air ratio and the target fuel-air ratio. The technical scheme of the embodiment of the application judges whether the actual intake air quantity reaches the expectation by introducing the air quantity compliance factor, and determines the fuel injection quantity control in different modes according to whether the actual intake air quantity meets the expectation, so that the accurate control of the lean-burn engine in transient operating conditions is realized, the stability of combustion is enhanced, and the economy of the engine is improved.

Description

Technical Field

[0001] This invention relates to the field of vehicle engine technology, and in particular to a control method, device, vehicle, and storage medium for a lean-burn engine. Background Technology

[0002] Lean-burn engines can effectively improve fuel economy and reduce HC and CO emissions. Therefore, lean-burn engines have broad application prospects in the automotive industry.

[0003] Existing lean-burn engines have a high excess air coefficient and a low gasoline content in the air-fuel mixture. Under changes in the operating conditions of lean-burn engines, problems such as combustion deterioration, interruption of flame propagation, or even misfire may occur.

[0004] Therefore, there is an urgent need for a solution that can enhance the combustion stability of lean-burn engines. Summary of the Invention

[0005] This invention provides a solution to the problem of poor combustion stability in lean-burn engines in related technologies.

[0006] According to one aspect of the present invention, a control method for a lean-burn engine is provided, the method comprising:

[0007] Obtain the current required output torque, and correct the current required output torque according to a preset rule to obtain the corrected required output torque;

[0008] Based on the corrected required output torque, the corresponding required intake volume is determined, and the intake control of the lean-burn engine is performed based on the required intake volume.

[0009] Obtain the actual intake volume, and determine the air volume compliance factor based on the actual intake volume and the required intake volume; wherein, the air volume compliance factor is the ratio of the actual intake volume to the required intake volume;

[0010] When the air volume compliance factor is less than the first set threshold or greater than the second set threshold, the first required fuel injection quantity is determined based on the actual air intake quantity and the corrected required output torque; when the air volume compliance factor is greater than or equal to the first set threshold and less than or equal to the second set threshold, the second required fuel injection quantity is determined based on the actual air-fuel ratio and the target air-fuel ratio; wherein, the first set threshold is less than the second set threshold.

[0011] The lean-burn engine is fuel injection controlled according to the first required fuel injection quantity or the second required fuel injection quantity.

[0012] Optionally, when the air volume compliance factor is less than a first set threshold or greater than a second set threshold, determining the first required fuel injection quantity based on the actual air intake volume and the corrected required output torque includes:

[0013] When the air volume compliance factor is less than the first set threshold or greater than the second set threshold, the required air-fuel ratio is determined based on the corrected required output torque and the actual intake air volume.

[0014] The first required fuel injection quantity is determined based on the required air-fuel ratio and the actual intake air volume.

[0015] Optionally, when the air volume compliance factor is greater than or equal to a first set threshold and less than or equal to a second set threshold, determining the second required fuel injection quantity based on the actual air-fuel ratio and the target air-fuel ratio includes:

[0016] When the air volume compliance factor is greater than or equal to the first set threshold and less than or equal to the second set threshold, the second required fuel injection quantity is determined by proportional-integral-derivative control based on the actual air-fuel ratio and the target air-fuel ratio.

[0017] Optionally, the step of correcting the current required output torque according to a preset rule to obtain the corrected required output torque includes:

[0018] The required output torque is adjusted based on the ignition angle efficiency;

[0019] The corrected required output torque satisfies the following formula:

[0020] m2 = m1 / η;

[0021] Where m1 is the current required output torque, m2 is the corrected required output torque, and η is the ignition angle efficiency.

[0022] Optionally, the method includes:

[0023] The ignition angle offset is determined based on the engine speed, and the ignition angle efficiency is determined based on the ignition angle offset.

[0024] Optionally, after obtaining the current required output torque, the method further includes:

[0025] Based on the current required output torque and engine speed, determine the optimal ignition angle, and then determine the actual ignition angle based on the ignition angle offset and the optimal ignition angle.

[0026] According to another aspect of the present invention, a control device for a lean-burn engine is provided, the device comprising:

[0027] The torque determination module is used to obtain the current required output torque and correct the current required output torque according to a preset rule to obtain the corrected required output torque.

[0028] The intake control module is used to determine the corresponding required intake volume based on the corrected required output torque, and to control the intake of the lean-burn engine based on the required intake volume.

[0029] The air volume compliance factor determination module is used to obtain the actual air intake volume and determine the air volume compliance factor based on the actual air intake volume and the required air intake volume; wherein, the air volume compliance factor is the ratio of the actual air intake volume to the required air intake volume.

[0030] The fuel injection quantity determination module is used to determine a first required fuel injection quantity based on the actual intake air volume and the corrected required output torque when the air volume compliance factor is less than a first set threshold or greater than a second set threshold; and to determine a second required fuel injection quantity based on the actual air-fuel ratio and the target air-fuel ratio when the air volume compliance factor is greater than or equal to the first set threshold and less than or equal to the second set threshold; wherein the first set threshold is less than the second set threshold.

[0031] The fuel injection control module is used to control the fuel injection of the lean-burn engine according to the first required fuel injection quantity or the second required fuel injection quantity.

[0032] According to another aspect of the present invention, a vehicle is provided, the vehicle comprising:

[0033] At least one processor; and a memory communicatively connected to said at least one processor;

[0034] The memory stores a computer program that can be executed by the at least one processor, which is then executed by the at least one processor to enable the at least one processor to perform the control method for the lean-burn engine described above.

[0035] According to another aspect of the present invention, a computer-readable storage medium is provided, the computer-readable storage medium storing computer instructions for causing a processor to execute and implement the control method of the lean-burn engine as described in any of the preceding claims.

[0036] The technical solution of this invention introduces an air volume compliance factor to determine whether the actual air intake volume meets expectations, and determines different methods of fuel injection volume control based on whether the actual air intake volume meets expectations. This achieves precise control of the transient operating conditions of the lean-burn engine, enhances combustion stability, helps reduce fuel consumption, and improves the economy of the lean-burn engine.

[0037] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a flowchart illustrating a control method for a lean-burn engine according to Embodiment 1 of the present invention;

[0040] Figure 2 A flowchart of another control method for a lean-burn engine provided in Embodiment 2 of the present invention;

[0041] Figure 3 This is a schematic diagram of the control device for a lean-burn engine provided in Embodiment 3 of the present invention;

[0042] Figure 4 This is a structural schematic diagram of a vehicle provided in Embodiment 4 of the present invention. Detailed Implementation

[0043] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0044] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0045] Example 1

[0046] Figure 1 The flowchart illustrates a control method for a lean-burn engine according to Embodiment 1 of the present invention. This method can be executed by a control device for the lean-burn engine, which can be configured in a vehicle. Figure 1 As shown, the method includes:

[0047] S110. Obtain the current required output torque and correct the current required output torque according to the preset rules to obtain the corrected required output torque.

[0048] Specifically, the current required output torque refers to the torque value that the lean-burn engine needs to output under the current operating conditions. For gasoline vehicles, the current required output torque can be obtained by reading the position of the accelerator pedal. For hybrid vehicles, the current required output torque of the lean-burn engine can be obtained by reading the data of the HCU (Hybrid Control Unit). The HCU can determine the switching and power distribution between the engine and the electric motor according to the vehicle's driving mode and power demand, and calculate the current required output torque of the engine. It is easy to understand that the calibration of the engine torque model is carried out under ideal conditions (such as ambient temperature, water temperature, intake pressure, etc.). However, the actual usage conditions of a vehicle usually deviate from the ideal conditions. Therefore, the current required output torque obtained by reading the accelerator pedal position or reading the HCU data will also deviate from the actual required output torque. In this embodiment, after obtaining the current required output torque of the lean-burn engine by reading the accelerator pedal position or reading the HCU data, the current required output torque will be corrected according to a preset rule to obtain the corrected required output torque, so as to reduce the deviation from the actual required output torque of the lean-burn engine. In this embodiment, the corrected required output torque is greater than the current required output torque.

[0049] S120. Based on the corrected required output torque, determine the corresponding required intake volume, and control the intake of the lean-burn engine according to the required intake volume.

[0050] In this embodiment, the relationship between the torque and intake volume of the lean-burn engine can be obtained in advance through multiple experimental measurements and statistics, and a reference table (such as a MAP table) for the torque and intake volume of the lean-burn engine can be generated. This reference table is stored in the vehicle's microcontroller unit. The corresponding required intake volume is determined by looking up the table with the corrected required output torque, and the intake control of the lean-burn engine is performed according to the required intake volume.

[0051] S130. Obtain the actual intake volume and determine the air volume compliance factor based on the actual intake volume and the required intake volume; wherein, the air volume compliance factor is the ratio of the actual intake volume to the required intake volume.

[0052] Specifically, the lean-burn engine is equipped with an air flow sensor, which can detect the amount of air intake in the lean-burn engine and convert the intake air volume information into an electrical signal through a circuit connection, which is then input to the ECU (Electronic Control Unit). In this embodiment, the actual intake air volume of the lean-burn engine can be obtained by reading the data from the ECU.

[0053] S140. When the air volume compliance factor is less than the first set threshold or greater than the second set threshold, the first demand injection quantity is determined based on the actual intake air volume and the corrected demand output torque. When the air volume compliance factor is greater than or equal to the first set threshold and less than or equal to the second set threshold, the second demand injection quantity is determined based on the actual air-fuel ratio and the target air-fuel ratio. Wherein, the first set threshold is less than the second set threshold.

[0054] Specifically, when the actual intake air volume does not reach the expected level, i.e., when the actual intake air volume is too high or too low, the fuel injection quantity is determined based on the actual intake air volume and the corrected required output torque. This avoids problems such as incomplete combustion, interrupted flame propagation, or even misfire caused by an excessively low or high air-fuel ratio. When the actual intake air volume reaches the expected level, the actual air-fuel ratio is adjusted to be close to the target air-fuel ratio (stoichiometric ratio) based on the actual air-fuel ratio and the target air-fuel ratio, which helps improve combustion efficiency and reduce fuel consumption. In this embodiment, the value of the air volume compliance factor can be used to determine whether the actual intake air volume has reached the expected level. When the air volume compliance factor is less than the first set threshold or greater than the second set threshold, it indicates that the actual intake air volume has not reached the expected level. In this case, the fuel injection quantity is determined based on the actual intake air volume and the corrected required output torque to avoid problems such as incomplete combustion, interrupted flame propagation, or even misfire caused by an excessively low or high air-fuel ratio. When the air volume compliance factor is greater than or equal to the first set threshold and less than or equal to the second set threshold, it indicates that the actual intake air volume has met expectations. At this point, based on the actual air-fuel ratio and the target air-fuel ratio, the actual air-fuel ratio is adjusted to be close to the target air-fuel ratio (stoichiometric ratio), which helps improve combustion efficiency and reduce fuel consumption. By determining whether the actual intake air volume meets expectations, different fuel injection quantities are determined, thereby achieving precise control of the transient operating conditions of the lean-burn engine, enhancing combustion stability, and contributing to reduced fuel consumption and improved fuel economy.

[0055] S150: Control fuel injection for lean-burn engines based on either the first or second required fuel injection quantity.

[0056] The control method for a lean-burn engine provided in this embodiment of the invention includes: acquiring the current required output torque; correcting the current required output torque according to a preset rule to obtain a corrected required output torque; determining the corresponding required intake air volume based on the corrected required output torque; controlling the intake air volume of the lean-burn engine based on the required intake air volume; acquiring the actual intake air volume; determining an air volume compliance factor based on the actual intake air volume and the required intake air volume, wherein the air volume compliance factor is the ratio of the actual intake air volume to the required intake air volume; when the air volume compliance factor is less than a first set threshold or greater than a second set threshold, determining a first required fuel injection quantity based on the actual intake air volume and the corrected required output torque; when the air volume compliance factor is greater than or equal to the first set threshold and less than or equal to the second set threshold, determining a second required fuel injection quantity based on the actual air-fuel ratio and the target air-fuel ratio, wherein the first set threshold is less than the second set threshold; and controlling the fuel injection of the lean-burn engine based on the first required fuel injection quantity or the second required fuel injection quantity. The technical solution of this invention introduces an air volume compliance factor to determine whether the actual air intake volume meets expectations, and determines different methods of fuel injection volume control based on whether the actual air intake volume meets expectations. This achieves precise control of the transient operating conditions of the lean-burn engine, enhances combustion stability, helps reduce fuel consumption, and improves the economy of the lean-burn engine.

[0057] Example 2

[0058] Figure 2 This is a flowchart illustrating another control method for a lean-burn engine provided in Embodiment 2 of the present invention. Figure 2 As shown, the method includes:

[0059] S210. Obtain the current required output torque of the lean-burn engine, and correct the current required output torque according to the preset rules to obtain the corrected required output torque.

[0060] Optionally, the corrected required output torque is obtained by correcting the current required output torque according to a preset rule, including:

[0061] Adjust the required output torque based on the ignition angle efficiency;

[0062] The corrected required output torque satisfies the following formula:

[0063] m2 = m1 / η;

[0064] Where m1 is the current required output torque, m2 is the corrected required output torque, and η is the ignition angle efficiency.

[0065] In other embodiments, the ignition angle offset can be determined based on the engine speed, and the ignition angle efficiency can be determined based on the ignition angle offset.

[0066] Specifically, the vehicle's microcontroller unit stores a lookup table of engine speed versus ignition angle offset and a lookup table of ignition angle offset versus ignition angle efficiency. In this embodiment, the engine speed of the lean-burn engine is obtained by reading data from the ECU, and the ignition angle offset is determined by looking up the table based on the engine speed, and the ignition angle efficiency is determined by looking up the table based on the ignition angle offset.

[0067] S211. Determine the optimal ignition angle based on the current required output torque and engine speed, and determine the actual ignition angle based on the ignition angle offset and the optimal ignition angle.

[0068] Specifically, the vehicle's microcontroller unit stores a lookup table of output torque, engine speed, and optimal ignition angle. In this embodiment, after obtaining the current required output torque, the optimal ignition angle is determined by looking up the table based on the current required output torque and engine speed. The actual ignition angle is then determined based on the ignition angle offset and the optimal ignition angle, where the actual ignition angle is the sum of the optimal ignition angle and the ignition angle offset.

[0069] S220: Determine the corresponding required intake volume based on the corrected required output torque, and control the intake of the lean-burn engine according to the required intake volume.

[0070] S230. Obtain the actual intake volume and determine the air volume compliance factor based on the actual intake volume and the required intake volume; wherein, the air volume compliance factor is the ratio of the actual intake volume to the required intake volume.

[0071] S240. When the air volume compliance factor is less than the first set threshold or greater than the second set threshold, the first demand injection quantity is determined based on the actual intake air volume and the corrected demand output torque. When the air volume compliance factor is greater than or equal to the first set threshold and less than or equal to the second set threshold, the second demand injection quantity is determined based on the actual air-fuel ratio and the target air-fuel ratio. Wherein, the first set threshold is less than the second set threshold.

[0072] In this embodiment, when the air volume compliance factor is less than a first set threshold or greater than a second set threshold, the first required fuel injection quantity is determined based on the actual intake air volume and the corrected required output torque, including:

[0073] When the air volume compliance factor is less than the first set threshold or greater than the second set threshold, the required air-fuel ratio is determined based on the corrected required output torque and the actual intake air volume.

[0074] The first required fuel injection quantity is determined based on the demand air-fuel ratio and the actual intake air volume.

[0075] Specifically, the vehicle's microcontroller unit stores a lookup table of output torque, intake air volume, and air-fuel ratio in advance. In this embodiment, when the air volume compliance factor is less than a first set threshold or greater than a second set threshold, the required air-fuel ratio is determined by looking up the table based on the corrected required output torque and actual intake air volume. The first required fuel injection quantity is determined based on the required air-fuel ratio and actual intake air volume, wherein the first required fuel injection quantity is the product of the required air-fuel ratio and the actual intake air volume.

[0076] In this embodiment, when the air volume compliance factor is greater than or equal to a first set threshold and less than or equal to a second set threshold, the second required fuel injection quantity is determined based on the actual air-fuel ratio and the target air-fuel ratio, including:

[0077] When the air volume compliance factor is greater than or equal to the first set threshold and less than or equal to the second set threshold, the second required fuel injection quantity is determined by proportional-integral-derivative control based on the actual air-fuel ratio and the target air-fuel ratio.

[0078] Specifically, Proportional-Integral-Derivative (PID) control calculates the input deviation using proportional, integral, and derivative functions, and the result is used to control the output. Input deviation = Read value of the controlled object - Setpoint. The proportional function reflects the input deviation signal of the control system proportionally, immediately initiating control action to reduce the input deviation once it occurs. The integral function primarily eliminates static errors and improves the system's accuracy. The derivative function reflects the changing trend of the input deviation signal and introduces an effective early correction signal before the input deviation signal increases, thereby accelerating the system's response and reducing settling time. In this embodiment, the input deviation is the difference between the actual air-fuel ratio and the target air-fuel ratio. Based on the actual and target air-fuel ratios, PID control is used to obtain the second required fuel injection quantity, adjusting the actual air-fuel ratio to near the target air-fuel ratio (chemical equivalence ratio), which helps improve combustion efficiency and reduce fuel consumption.

[0079] S250: Controls fuel injection in a lean-burn engine based on either the first or second required fuel injection quantity.

[0080] Example 3

[0081] Figure 3 This is a schematic diagram of the control device for a lean-burn engine provided in Embodiment 3 of the present invention. Figure 3 As shown, the device includes:

[0082] The torque determination module 100 is used to obtain the current required output torque and correct the current required output torque according to a preset rule to obtain the corrected required output torque.

[0083] The intake control module 200 is used to determine the corresponding required intake volume based on the corrected required output torque, and to control the intake of the lean-burn engine based on the required intake volume.

[0084] The air volume compliance factor determination module 300 is used to obtain the actual air intake volume and determine the air volume compliance factor based on the actual air intake volume and the required air intake volume; wherein, the air volume compliance factor is the ratio of the actual air intake volume to the required air intake volume.

[0085] The fuel injection quantity determination module 400 is used to determine the first required fuel injection quantity based on the actual intake volume and the corrected required output torque when the air volume compliance factor is less than the first set threshold or greater than the second set threshold; and to determine the second required fuel injection quantity based on the actual air-fuel ratio and the target air-fuel ratio when the air volume compliance factor is greater than or equal to the first set threshold and less than or equal to the second set threshold; wherein the first set threshold is less than the second set threshold.

[0086] The fuel injection control module 500 is used to control the fuel injection of a lean-burn engine according to a first required fuel injection quantity or a second required fuel injection quantity.

[0087] The control device for the lean-burn engine provided in the embodiments of the present invention can execute the control method for the lean-burn engine provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the method.

[0088] Example 4

[0089] Figure 4 This is a structural schematic diagram of a vehicle provided in Embodiment 4 of the present invention. Figure 4 As shown, the vehicle includes a processor 40 and a memory 41. The number of processors 40 in the vehicle can be one or more. Figure 4 Taking a processor 40 as an example, the processor 40 and memory 41 in the vehicle can be connected via a bus or other means. Figure 4 Taking the example of a connection between China and Israel via a bus.

[0090] The memory 41 serves as a storage medium, capable of storing software programs, computer-executable programs, and modules, such as the program module corresponding to the lean-burn engine control method in this embodiment of the invention. The processor 40 executes various system functions and data processing by running the software programs, instructions, and modules stored in the memory 41, thereby realizing the aforementioned lean-burn engine control method.

[0091] The memory 41 may primarily include a program storage area and a data storage area. The program storage area may store the operating system and at least one application program required for a given function, while the data storage area may store data created based on terminal usage. Furthermore, the memory 41 may include high-speed random access memory and non-volatile memory, such as at least one disk storage device, flash memory, or other non-volatile solid-state storage device. In some instances, the memory 41 may further include memory remotely located relative to the processor 40, which can be connected to the system via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0092] Example 5

[0093] Embodiment 5 of the present invention also provides a computer-readable storage medium containing computer instructions for causing a processor to execute and implement any of the lean-burn engine control methods described in the above embodiments.

[0094] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0095] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A control method for a lean-burn engine, characterized in that, The method includes: Obtain the current required output torque, and correct the current required output torque according to a preset rule to obtain the corrected required output torque; Based on the corrected required output torque, the corresponding required intake volume is determined, and the intake control of the lean-burn engine is performed based on the required intake volume. Obtain the actual intake volume, and determine the air volume compliance factor based on the actual intake volume and the required intake volume; wherein, the air volume compliance factor is the ratio of the actual intake volume to the required intake volume; When the air volume compliance factor is less than the first set threshold or greater than the second set threshold, the first required fuel injection quantity is determined based on the actual air intake quantity and the corrected required output torque; when the air volume compliance factor is greater than or equal to the first set threshold and less than or equal to the second set threshold, the second required fuel injection quantity is determined based on the actual air-fuel ratio and the target air-fuel ratio; wherein, the first set threshold is less than the second set threshold. The lean-burn engine is fuel injection controlled according to the first or the second required fuel injection quantity. When the air volume compliance factor is less than a first set threshold or greater than a second set threshold, determining the first required fuel injection quantity based on the actual air intake volume and the corrected required output torque includes: When the air volume compliance factor is less than the first set threshold or greater than the second set threshold, the required air-fuel ratio is determined based on the corrected required output torque and the actual intake air volume. The first required fuel injection quantity is determined based on the required air-fuel ratio and the actual intake air volume. When the air volume compliance factor is greater than or equal to a first set threshold and less than or equal to a second set threshold, determining the second required fuel injection quantity based on the actual air-fuel ratio and the target air-fuel ratio includes: When the air volume compliance factor is greater than or equal to the first set threshold and less than or equal to the second set threshold, the second required fuel injection quantity is determined by proportional-integral-derivative control based on the actual air-fuel ratio and the target air-fuel ratio. The step of correcting the current required output torque according to a preset rule to obtain the corrected required output torque includes: The required output torque is adjusted based on the ignition angle efficiency; The corrected required output torque satisfies the following formula: m2 = m1 / η; Where m1 is the current required output torque, m2 is the corrected required output torque, and η is the ignition angle efficiency.

2. The control method for a lean-burn engine according to claim 1, characterized in that, The method includes: The ignition angle offset is determined based on the engine speed, and the ignition angle efficiency is determined based on the ignition angle offset.

3. The control method for a lean-burn engine according to claim 2, characterized in that, After obtaining the current required output torque, the method further includes: Based on the current required output torque and engine speed, determine the optimal ignition angle, and then determine the actual ignition angle based on the ignition angle offset and the optimal ignition angle.

4. A control device for a lean-burn engine, capable of executing the control method for a lean-burn engine as described in any one of claims 1-3, characterized in that, The device includes: The torque determination module is used to obtain the current required output torque and correct the current required output torque according to a preset rule to obtain the corrected required output torque. The intake control module is used to determine the corresponding required intake volume based on the corrected required output torque, and to control the intake of the lean-burn engine based on the required intake volume. The air volume compliance factor determination module is used to obtain the actual air intake volume and determine the air volume compliance factor based on the actual air intake volume and the required air intake volume; wherein, the air volume compliance factor is the ratio of the actual air intake volume to the required air intake volume. The fuel injection quantity determination module is used to determine a first required fuel injection quantity based on the actual intake air volume and the corrected required output torque when the air volume compliance factor is less than a first set threshold or greater than a second set threshold; and to determine a second required fuel injection quantity based on the actual air-fuel ratio and the target air-fuel ratio when the air volume compliance factor is greater than or equal to the first set threshold and less than or equal to the second set threshold; wherein the first set threshold is less than the second set threshold. The fuel injection control module is used to control the fuel injection of the lean-burn engine according to the first required fuel injection quantity or the second required fuel injection quantity.

5. A vehicle, characterized in that, The vehicles include: At least one processor; and a memory communicatively connected to said at least one processor; The memory stores a computer program that can be executed by the at least one processor, which is then executed by the at least one processor to enable the at least one processor to perform the control method for the lean-burn engine according to any one of claims 1-3.

6. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that, when executed by a processor, implement the control method for the lean-burn engine as described in any one of claims 1-3.

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