Air-fuel ratio control method and device, electronic equipment and vehicle

Abstract

The invention provides an air-fuel ratio control method and device, electronic equipment and a vehicle, and relates to the technical field of engines. The air-fuel ratio control method is applied to the engine, the engine uses fuel only containing gasoline, fuel only containing oxygen-containing fuel or mixed fuel of the gasoline and the oxygen-containing fuel in any proportion, and the air-fuel ratio control method comprises the steps that a corresponding target air-fuel ratio interval is determined according to the proportion of the oxygen-containing fuel in the fuel; an interpolation algorithm is adopted, and the target air-fuel ratio is determined according to the proportion of the oxygen-containing fuel and the target air-fuel ratio interval; and the engine is driven based on the target air-fuel ratio, and the target air-fuel ratio is corrected according to the current exhaust state of the engine so as to determine the corrected target air-fuel ratio. According to the method, the problem that the self-adaptive compensation deviation of the air-fuel ratio is large when the mixed fuel comprising different proportions of oxygen-containing fuel is used is solved, so that the air-fuel ratio control is more accurate, the combustion efficiency can be improved, and emission can be reduced.

Description

Technical Field

[0001] This invention relates to the field of engine technology, and more specifically, to an air-fuel ratio control method, device, electronic equipment, and vehicle. Background Technology

[0002] With the rapid development of the automotive industry and increasingly stringent global environmental protection requirements, engine emission control has become an important direction for modern vehicle technology research and development. The air-fuel ratio (i.e., the mixing ratio of air and fuel) during the operation of an internal combustion engine is a key parameter that affects engine combustion efficiency and pollutant emission levels. Therefore, how to achieve precise control of the air-fuel ratio is an important technical means to improve fuel economy, reduce emission levels, and meet emission regulations.

[0003] In related technologies, gasoline engines widely use closed-loop control combined with adaptive compensation algorithms to adjust the air-fuel ratio. However, with the promotion and application of alternative fuels (such as methanol-gasoline blends), traditional adaptive compensation algorithms based on gasoline combustion characteristics face the problem of insufficient accuracy. Inaccurate compensation leads to air-fuel ratio deviation, which in turn affects engine efficiency and emissions. Summary of the Invention

[0004] The problem addressed by this invention is how to reduce the air-fuel ratio deviation of mixed fuels.

[0005] To address the aforementioned problems, this invention provides an air-fuel ratio control method, apparatus, electronic device, and vehicle.

[0006] In a first aspect, the present invention provides an air-fuel ratio control method applied to an engine, wherein the engine uses a fuel containing only gasoline, a fuel containing only oxygen-containing fuel, or a mixture of gasoline and oxygen-containing fuel in any proportion, and the air-fuel ratio control method includes: The target air-fuel ratio range is determined based on the proportion of oxygenated fuel in the fuel. An interpolation algorithm is used to determine the target air-fuel ratio based on the proportion of oxygen-containing fuel and the target air-fuel ratio range. The engine is driven based on the target air-fuel ratio, and the target air-fuel ratio is corrected according to the current exhaust state of the engine to determine the corrected target air-fuel ratio.

[0007] Optionally, determining the corresponding target air-fuel ratio range based on the proportion of oxygenated fuel in the fuel includes: Multiple breakpoints are pre-marked, wherein each breakpoint represents a segment point corresponding to a different proportion of the oxygen-containing fuel, each breakpoint corresponds to a target air-fuel ratio, and two adjacent breakpoints constitute an air-fuel ratio range. The target air-fuel ratio range is determined based on the proportion of oxygenated fuel and the size of the multiple breakpoints.

[0008] Optionally, the step of using an interpolation algorithm to determine the target air-fuel ratio based on the proportion of oxygen-containing fuel and the target air-fuel ratio range includes: The target air-fuel ratio change is determined based on the proportion of oxygenated fuel, the two breakpoints corresponding to the target air-fuel ratio range, and the upper and lower limits of the target air-fuel ratio range. The target air-fuel ratio is determined based on the lower limit of the target air-fuel ratio range and the change in the target air-fuel ratio.

[0009] Optionally, correcting the target air-fuel ratio based on the current exhaust conditions of the engine includes: The actual air-fuel ratio is determined based on the current exhaust conditions of the engine. When the actual air-fuel ratio is greater than the target air-fuel ratio, the target air-fuel ratio is reduced according to the actual air-fuel ratio. When the actual air-fuel ratio is equal to the target air-fuel ratio, the target air-fuel ratio is not corrected. When the actual air-fuel ratio is less than the target air-fuel ratio, the target air-fuel ratio is increased according to the actual air-fuel ratio.

[0010] Optionally, determining the actual air-fuel ratio based on the current exhaust state of the engine includes: The oxygen concentration in the exhaust gas is detected by a rear oxygen sensor, wherein the rear oxygen sensor is installed at the exhaust port of the engine. The actual air-fuel ratio is determined based on the oxygen concentration.

[0011] Optionally, the step of correcting the target air-fuel ratio based on the current exhaust state of the engine further includes: The current compensation amount is calculated by multiplying the difference between the actual air-fuel ratio and the target air-fuel ratio by a preset learning coefficient. The current compensation amount is then added to the target air-fuel ratio to obtain the corrected target air-fuel ratio. Based on the corrected target air-fuel ratio, return to the step of driving the engine based on the target air-fuel ratio, and iterate until the current actual air-fuel ratio is equal to the corrected target air-fuel ratio.

[0012] Optionally, the oxygenated fuel includes at least one of methanol, ethanol, diethyl ether, and bio-alcohols.

[0013] Secondly, the present invention provides an air-fuel ratio control device applied to an engine, the engine using fuel containing only gasoline, fuel containing only oxygen-containing fuel, or a mixture of gasoline and oxygen-containing fuel in any proportion, the air-fuel ratio control device comprising: The first module is used to determine the corresponding target air-fuel ratio range based on the proportion of oxygenated fuel in the fuel; The second module is used to determine the target air-fuel ratio based on the proportion of oxygenated fuel and the target air-fuel ratio range using an interpolation algorithm. The third module is used to drive the engine based on the target air-fuel ratio, and to correct the target air-fuel ratio according to the current exhaust state of the engine, so as to determine the corrected target air-fuel ratio.

[0014] Thirdly, the present invention provides an electronic device, including a memory and a processor; The memory is used to store computer programs; The processor is configured to implement the air-fuel ratio control method as described in the first aspect when executing the computer program.

[0015] Fourthly, the present invention provides a vehicle including the electronic equipment described in the third aspect.

[0016] The beneficial effects of the air-fuel ratio control method of the present invention are as follows: the target air-fuel ratio range is determined according to the proportion of oxygen-containing fuel in the fuel, thereby determining the target air-fuel ratio. The target air-fuel ratio is then corrected in combination with the exhaust state. The air-fuel ratio target can be dynamically adjusted for different fuel compositions, which solves the problem of large adaptive compensation deviation of air-fuel ratio when using mixed fuels including different proportions of oxygen-containing fuel. This makes the air-fuel ratio control more precise, thereby improving combustion efficiency and reducing emissions. Attached Figure Description

[0017] Figure 1 This is a schematic flowchart of the air-fuel ratio control method according to an embodiment of the present invention; Figure 2 This is a schematic diagram illustrating the principle of the air-fuel ratio control method according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the process for determining the target air-fuel ratio range according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the process for determining the target air-fuel ratio according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the process for correcting the target air-fuel ratio according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the process for determining the actual air-fuel ratio according to an embodiment of the present invention; Figure 7 This is a system architecture diagram of the air-fuel ratio control device according to an embodiment of the present invention; Figure 8 This is a system architecture diagram of an electronic device according to an embodiment of the present invention. Detailed Implementation

[0018] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0019] It should be understood that the various steps described in the method embodiments of the present invention may be performed in different orders and / or in parallel. Furthermore, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present invention is not limited in this respect.

[0020] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this invention are used only to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0021] It should be noted that the terms "a" and "a plurality of" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0022] The names of the messages or information exchanged between the multiple devices in the embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of these messages or information.

[0023] like Figure 1 As shown in the embodiment of the present invention, an air-fuel ratio control method is applied to an engine, wherein the engine uses fuel containing only gasoline, fuel containing only oxygen-containing fuel, or a mixture of gasoline and oxygen-containing fuel in any proportion. The air-fuel ratio control method includes: S100: Determine the corresponding target air-fuel ratio range based on the proportion of oxygenated fuel in the fuel.

[0024] Specifically, taking methanol as the oxygenated fuel and gasoline and methanol as the mixed fuel as an example, an alcohol ratio sensor can be installed on the fuel line to detect the methanol ratio N in the current mixed fuel, and the corresponding target air-fuel ratio range can be determined based on the methanol ratio N.

[0025] For pure gasoline fuel, the methanol ratio N=0; for pure methanol fuel, the methanol ratio N=1; and for a mixture of gasoline and methanol, the methanol ratio N is between 0 and 1.

[0026] S200: The target air-fuel ratio is determined by using an interpolation algorithm based on the proportion of oxygen-containing fuel and the target air-fuel ratio range.

[0027] Specifically, when the methanol ratio N is between two adjacent breakpoints, a linear interpolation algorithm is used to calculate the target air-fuel ratio T corresponding to the current methanol ratio based on the target air-fuel ratio values ​​corresponding to the two adjacent breakpoints. N .

[0028] S300: Drive the engine based on the target air-fuel ratio, and correct the target air-fuel ratio according to the current exhaust state of the engine to determine the corrected target air-fuel ratio.

[0029] Specifically, the engine is driven by a target air-fuel ratio. By detecting the oxygen concentration in the exhaust, the lean or rich state of the exhaust mixture is determined, and the target air-fuel ratio is corrected to achieve real-time adaptive adjustment of the air-fuel ratio, thereby enabling stable combustion and optimized emission performance of the engine.

[0030] For pure gasoline fuel, under conditions of complete combustion, the adaptive compensation is relatively small and will not significantly correct the target air-fuel ratio. However, for pure methanol fuel, under ideal conditions (complete combustion), the adaptive compensation will tend to learn towards the rich end, and the higher the proportion of methanol in the fuel, the greater the adaptive compensation. The specific principle is as follows: The main component of gasoline is C8H. 18 The reaction formula for its complete combustion is: C8H 18 +12.5*O2=8*CO2+9*H2O; The main component of methanol is CH3OH, and its complete combustion reaction is as follows: CH3OH + 1.5 O2 = CO2 + 2 H2O; The molar mass of gasoline = (12*8) + (1*18) = 114, corresponding to 12.5*O2 of oxygen. The volume percentage of oxygen in air is 21%, and the mass percentage is 23.2%, so the corresponding molar mass of air = 12.5*32 / 23.2% = 1724; the molar mass of methanol = (12*1) + (1*4) + (16*1) = 32, corresponding to 1.5*O2 of oxygen, so the corresponding molar mass of air = 1.5*32 / 23.2% = 207.

[0031] Assuming the excess air coefficient lambda=X, then when 114g of gasoline and 1724*Xg of air are fully combusted, the mass percentage of oxygen in the exhaust is: 1724*(X-1) / (114+1724*X)*23.2%; when 32g of methanol and 207*Xg of air are fully combusted, the mass percentage of oxygen in the exhaust is: 207*(X-1) / (32+207*X)*23.2%.

[0032] Therefore, when lambda≠1, the mass percentage of excess oxygen produced by the complete combustion of gasoline is greater than that produced by the complete combustion of methanol. The formulas for the volume percentage of excess oxygen produced by the complete combustion of the two fuels are as follows: Gasoline: 21*(X-1) / (7.56+100*X); Methanol: 21*(X-1) / (21+100*X).

[0033] It can be seen that, under the same upstream mixture concentration, the oxygen content in the downstream exhaust is less when using methanol fuel than when using gasoline fuel. The downstream oxygen sensor generates voltage through the oxygen concentration at the exhaust and reference electrode. The sensor's original output is the volume percentage of oxygen corresponding to the voltage. By converting the final output voltage and the correspondence between lambda, the adaptive compensation control based on the downstream oxygen sensor will produce the following problems when using methanol fuel or a mixture containing methanol fuel: (1) the adaptive compensation value is richer than that of pure gasoline fuel; (2) the adaptive compensation value will also have corresponding deviations for fuels with different methanol mixing ratios.

[0034] In this embodiment, the target air-fuel ratio range is determined according to the proportion of oxygen-containing fuel in the fuel, thereby determining the target air-fuel ratio. The target air-fuel ratio is then corrected in conjunction with the exhaust state. This allows for dynamic adjustment of the air-fuel ratio target for different fuel compositions, solving the problem of large adaptive compensation deviation of the air-fuel ratio when using mixed fuels containing different proportions of oxygen-containing fuel. This makes the air-fuel ratio control more precise, thereby improving combustion efficiency and reducing emissions.

[0035] Optionally, determining the corresponding target air-fuel ratio range based on the proportion of oxygenated fuel in the fuel includes: S110: Multiple breakpoints are pre-calibrated, wherein the breakpoints represent the segment points corresponding to different proportions of the oxygen-containing fuel, each breakpoint corresponds to a target air-fuel ratio, and two adjacent breakpoints constitute an air-fuel ratio range.

[0036] Specifically, in combination Figure 3 As shown, taking five different breakpoints (0, 0.25, 0.5, 0.75, 1) as an example, each breakpoint corresponds to a different target air-fuel ratio (T1, T2, T3, T4, T5), dividing the adaptive compensation control into several intervals; T1 corresponds to the target air-fuel ratio when the methanol ratio N=0, T2 corresponds to the target air-fuel ratio when the methanol ratio N=0.25, T3 corresponds to the target air-fuel ratio when the methanol ratio N=0.5, T4 corresponds to the target air-fuel ratio when the methanol ratio N=0.75, and T5 corresponds to the target air-fuel ratio when the methanol ratio N=1.

[0037] S120: Determine the corresponding target air-fuel ratio range based on the proportion of oxygenated fuel and the size of the plurality of breakpoints.

[0038] Specifically, in combination Figure 3 As shown, taking a methanol ratio of N=0.3 as an example, 0.3 is between 0.25 and 0.5, so the target air-fuel ratio range is (T2, T3). The target air-fuel ratio ranges corresponding to other methanol ratios can be obtained in the same way.

[0039] In this optional embodiment, the air-fuel ratio range is constructed by breaking points, which facilitates calibration and interpolation calculation, and realizes the continuity and linearity of the air-fuel ratio as the fuel ratio changes, resulting in smoother control and more sensitive response.

[0040] Optionally, the step of using an interpolation algorithm to determine the target air-fuel ratio based on the proportion of oxygen-containing fuel and the target air-fuel ratio range includes: S210: Determine the target air-fuel ratio change based on the proportion of oxygenated fuel, the two breakpoints corresponding to the target air-fuel ratio range, and the upper and lower limits of the target air-fuel ratio range.

[0041] Specifically, in combination Figure 4 As shown, taking a methanol ratio of N=0.3 as an example, the exemplary interpolation formula is: T N =T2+(0.3-0.25)*(T3-T2) / (0.5-0.25); Among them, T N The target air-fuel ratio is represented by the second term on the right, which represents the change in the target air-fuel ratio.

[0042] S220: Determine the target air-fuel ratio based on the lower limit of the target air-fuel ratio range and the change in the target air-fuel ratio.

[0043] Specifically, in combination Figure 4 As shown, the target air-fuel ratio T can be determined using the above interpolation formula. N Subsequently, it can be used in conjunction with the exhaust rich / lean status output by the after-oxygen sensor to dynamically adjust the compensation amount, thereby achieving more accurate and stable air-fuel ratio control.

[0044] In this optional embodiment, an interpolation algorithm is used to smoothly transition the target air-fuel ratio between breakpoints, thereby achieving accurate dynamic calculation of the air-fuel ratio and improving the consistency of the control system response and the smoothness of the drive.

[0045] Optionally, correcting the target air-fuel ratio based on the current exhaust conditions of the engine includes: S310: Determine the actual air-fuel ratio based on the current exhaust state of the engine.

[0046] Specifically, in combination Figure 2 As shown, the oxygen concentration in the exhaust can be detected by the downstream oxygen sensor installed at the engine's exhaust port to determine whether the air-fuel mixture is too lean or too rich, thereby determining the engine's current exhaust state, and then determining the actual air-fuel ratio based on the engine's current exhaust state.

[0047] The rear oxygen sensor is installed downstream of the exhaust pipe to detect the oxygen concentration in the exhaust in real time and output a voltage signal corresponding to the current air-fuel ratio.

[0048] S320: When the actual air-fuel ratio is greater than the target air-fuel ratio, the target air-fuel ratio is reduced according to the actual air-fuel ratio.

[0049] Specifically, in combination Figure 5 As shown, when the actual air-fuel ratio is greater than the target air-fuel ratio, it indicates that the exhaust is too lean. The adaptive compensation calculation unit outputs a negative compensation amount to reduce the target air-fuel ratio.

[0050] S330: When the actual air-fuel ratio is equal to the target air-fuel ratio, the target air-fuel ratio is not corrected.

[0051] Specifically, in combination Figure 5 As shown, when the actual air-fuel ratio is equal to the target air-fuel ratio, the adaptive compensation calculation unit does not correct the target air-fuel ratio.

[0052] S340: When the actual air-fuel ratio is less than the target air-fuel ratio, increase the target air-fuel ratio according to the actual air-fuel ratio.

[0053] Specifically, in combination Figure 5As shown, when the actual air-fuel ratio is less than the target air-fuel ratio, it indicates that the exhaust is too rich. The adaptive compensation calculation unit outputs a positive compensation amount to increase the target air-fuel ratio, thereby realizing the dynamic correction of the target air-fuel ratio. Then, the fuel injection quantity can be controlled based on the compensated target air-fuel ratio to achieve adaptive control of the air-fuel ratio.

[0054] In this optional embodiment, a feedback correction mechanism is introduced to dynamically adjust the air-fuel ratio target based on the real-time exhaust status, thereby improving system robustness and achieving stable combustion and closed-loop optimization.

[0055] Optionally, determining the actual air-fuel ratio based on the current exhaust state of the engine includes: S311: The oxygen concentration in the exhaust gas is detected by a rear oxygen sensor, wherein the rear oxygen sensor is installed at the exhaust port of the engine.

[0056] Specifically, in combination Figure 6 As shown, the oxygen concentration in the exhaust gas is detected by a rear oxygen sensor installed at the engine's exhaust port. The sensor outputs a corresponding voltage signal based on changes in the oxygen concentration in the exhaust gas.

[0057] S312: Determine the actual air-fuel ratio based on the oxygen concentration.

[0058] Specifically, in combination Figure 6 As shown, taking a wide-range oxygen sensor as an example, the wide-range oxygen sensor can directly output the actual air-fuel ratio based on the oxygen concentration; alternatively, a functional relationship between the voltage signal and the actual air-fuel ratio can be established in advance (factory calibration or table lookup), and the sensor voltage can be converted into the actual air-fuel ratio by using a table lookup or fitting formula, such as using an interpolation method.

[0059] In this optional embodiment, the oxygen concentration is obtained in real time using a post-oxygen sensor, which can effectively deduce the current air-fuel ratio state and improve the real-time performance and accuracy of the air-fuel ratio closed-loop control system.

[0060] Optionally, the step of correcting the target air-fuel ratio based on the current exhaust state of the engine further includes: The current compensation amount is calculated by multiplying the difference between the actual air-fuel ratio and the target air-fuel ratio by a preset learning coefficient. The current compensation amount is then added to the target air-fuel ratio to obtain the corrected target air-fuel ratio. Based on the corrected target air-fuel ratio, return to the step of driving the engine based on the target air-fuel ratio, and iterate until the current actual air-fuel ratio is equal to the corrected target air-fuel ratio.

[0061] Specifically, a preset learning coefficient K is set, and the current compensation amount (timely compensation amount) is determined by multiplying the difference between the actual air-fuel ratio and the target air-fuel ratio with the preset learning coefficient K. The current compensation amount is added to the target air-fuel ratio to obtain the corrected target air-fuel ratio. Based on the corrected target air-fuel ratio, the steps of driving the engine based on the target air-fuel ratio are returned. The process is iterated until the current actual air-fuel ratio equals the corrected target air-fuel ratio. This is equivalent to iteratively accumulating the compensation amount according to the preset learning coefficient, thereby correcting the target air-fuel ratio. Through continuous correction, stable control of the air-fuel ratio is achieved, so that the engine always maintains efficient combustion under different fuel conditions.

[0062] In this optional embodiment, a gradual adjustment is achieved through an iterative correction mechanism, which enhances the system's adaptability and long-term stability, avoids over-adjustment, and improves fuel adaptation efficiency.

[0063] Optionally, the oxygenated fuel includes at least one of methanol, ethanol, diethyl ether, and bio-alcohols.

[0064] Specifically, similar to methanol, if another blended fuel differs significantly from gasoline in the following aspects: (1) oxygen content (e.g., ethanol, ether, biodiesel); (2) different oxygen requirements in the combustion reaction; (3) different oxygen concentration in the exhaust gas after complete combustion; then the voltage signal (i.e. oxygen concentration) detected by the oxygen sensor will be misled, thereby causing the traditional gasoline-type adaptive control system to misjudge the richness or leanness of the mixture. Therefore, this embodiment can be applied to the air-fuel ratio control of blended fuels containing oxygenated fuels such as methanol, ethanol, ether, and bio-alcohols.

[0065] In this optional embodiment, by controlling the air-fuel ratio of a mixture of oxygen-containing fuels such as methanol, ethanol, diethyl ether, and bio-alcohols, the system's adaptability to various alternative fuels can be improved, and its application scope can be expanded.

[0066] like Figure 7 As shown in the figure, an air-fuel ratio control device 700 provided in this embodiment of the invention is applied to an engine, the engine using fuel containing only gasoline, fuel containing only oxygen-containing fuel, or a mixture of gasoline and oxygen-containing fuel in any proportion, the air-fuel ratio control device 700 includes: The first module 710 is used to determine the corresponding target air-fuel ratio range based on the proportion of oxygenated fuel in the fuel; The second module 720 is used to determine the target air-fuel ratio based on the proportion of oxygenated fuel and the target air-fuel ratio range using an interpolation algorithm; The third module 730 is used to drive the engine based on the target air-fuel ratio, and to correct the target air-fuel ratio according to the current exhaust state of the engine, so as to determine the corrected target air-fuel ratio.

[0067] like Figure 8 As shown, an electronic device 800 provided in this embodiment of the invention includes a memory 820 and a processor 810; the memory 820 is used to store a computer program; the processor 810 is used to implement the air-fuel ratio control method as described above when the computer program is executed.

[0068] Alternatively, an electronic device 800 includes a memory 820 and a processor 810 coupled to the memory 820; the memory 820 is configured to store a computer program; and the processor 810 is configured to perform the following operations when the computer program is executed: The target air-fuel ratio range is determined based on the proportion of oxygenated fuel in the fuel. An interpolation algorithm is used to determine the target air-fuel ratio based on the proportion of oxygen-containing fuel and the target air-fuel ratio range. The engine is driven based on the target air-fuel ratio, and the target air-fuel ratio is corrected according to the current exhaust state of the engine to determine the corrected target air-fuel ratio.

[0069] This invention provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, it implements the air-fuel ratio control method described above.

[0070] Alternatively, a non-volatile computer-readable storage medium storing a computer program that, when executed by a processor, causes the processor to perform the following operations: The target air-fuel ratio range is determined based on the proportion of oxygenated fuel in the fuel. An interpolation algorithm is used to determine the target air-fuel ratio based on the proportion of oxygen-containing fuel and the target air-fuel ratio range. The engine is driven based on the target air-fuel ratio, and the target air-fuel ratio is corrected according to the current exhaust state of the engine to determine the corrected target air-fuel ratio.

[0071] The present invention will now be described an electronic device 800 that can serve as a server or client of the present invention, which is an example of a hardware device that can be applied to various aspects of the present invention. Electronic device 800 is intended to represent various forms of digital electronic computer devices, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. Electronic device 800 can also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0072] Electronic device 800 includes a computing unit that can perform various appropriate actions and processes based on a computer program stored in read-only memory (ROM) or a computer program loaded from a storage unit into random access memory (RAM). The RAM may also store various programs and data required for device operation. The computing unit, ROM, and RAM are interconnected via a bus. Input / output (I / O) interfaces are also connected to the bus.

[0073] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), or random access memory (RAM), etc. In this application, the units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of the embodiments of the present invention according to actual needs. Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated units can be implemented in hardware or as software functional units.

[0074] An embodiment of the present invention provides a vehicle including the aforementioned electronic equipment.

[0075] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. An air-fuel ratio control method, characterized in that, Applied to an engine that uses fuel containing only gasoline, fuel containing only oxygen-containing fuel, or a mixture of gasoline and oxygen-containing fuel in any proportion, the air-fuel ratio control method includes: The target air-fuel ratio range is determined based on the proportion of oxygenated fuel in the fuel. An interpolation algorithm is used to determine the target air-fuel ratio based on the proportion of oxygen-containing fuel and the target air-fuel ratio range. The engine is driven based on the target air-fuel ratio, and the target air-fuel ratio is corrected according to the current exhaust state of the engine to determine the corrected target air-fuel ratio.

2. The air-fuel ratio control method according to claim 1, characterized in that, The step of determining the target air-fuel ratio range based on the proportion of oxygenated fuel in the fuel includes: Multiple breakpoints are pre-marked, wherein each breakpoint represents a segment point corresponding to a different proportion of the oxygen-containing fuel, each breakpoint corresponds to a target air-fuel ratio, and two adjacent breakpoints constitute an air-fuel ratio range. The target air-fuel ratio range is determined based on the proportion of oxygenated fuel and the size of the multiple breakpoints.

3. The air-fuel ratio control method according to claim 2, characterized in that, The step of using an interpolation algorithm to determine the target air-fuel ratio based on the proportion of oxygenated fuel and the target air-fuel ratio range includes: The target air-fuel ratio change is determined based on the proportion of oxygenated fuel, the two breakpoints corresponding to the target air-fuel ratio range, and the upper and lower limits of the target air-fuel ratio range. The target air-fuel ratio is determined based on the lower limit of the target air-fuel ratio range and the change in the target air-fuel ratio.

4. The air-fuel ratio control method according to claim 1, characterized in that, The step of correcting the target air-fuel ratio based on the current exhaust state of the engine includes: The actual air-fuel ratio is determined based on the current exhaust conditions of the engine. When the actual air-fuel ratio is greater than the target air-fuel ratio, the target air-fuel ratio is reduced according to the actual air-fuel ratio. When the actual air-fuel ratio is equal to the target air-fuel ratio, the target air-fuel ratio is not corrected. When the actual air-fuel ratio is less than the target air-fuel ratio, the target air-fuel ratio is increased according to the actual air-fuel ratio.

5. The air-fuel ratio control method according to claim 4, characterized in that, Determining the actual air-fuel ratio based on the current exhaust state of the engine includes: The oxygen concentration in the exhaust gas is detected by a rear oxygen sensor, wherein the rear oxygen sensor is installed at the exhaust port of the engine. The actual air-fuel ratio is determined based on the oxygen concentration.

6. The air-fuel ratio control method according to claim 4, characterized in that, The step of correcting the target air-fuel ratio based on the current exhaust state of the engine further includes: The current compensation amount is calculated by multiplying the difference between the actual air-fuel ratio and the target air-fuel ratio by a preset learning coefficient. The current compensation amount is then added to the target air-fuel ratio to obtain the corrected target air-fuel ratio. Based on the corrected target air-fuel ratio, return to the step of driving the engine based on the target air-fuel ratio, and iterate until the current actual air-fuel ratio is equal to the corrected target air-fuel ratio.

7. The air-fuel ratio control method according to any one of claims 1 to 6, characterized in that, The oxygenated fuel includes at least one of methanol, ethanol, diethyl ether, and bio-alcohols.

8. An air-fuel ratio control device, characterized in that, An air-fuel ratio control device is applied to an engine that uses fuel containing only gasoline, fuel containing only oxygenated fuel, or a mixture of gasoline and oxygenated fuel in any proportion. The first module is used to determine the corresponding target air-fuel ratio range based on the proportion of oxygenated fuel in the fuel; The second module is used to determine the target air-fuel ratio based on the proportion of oxygenated fuel and the target air-fuel ratio range using an interpolation algorithm. The third module is used to drive the engine based on the target air-fuel ratio, and to correct the target air-fuel ratio according to the current exhaust state of the engine, so as to determine the corrected target air-fuel ratio.

9. An electronic device, characterized in that, Including memory and processor; The memory is used to store computer programs; The processor is configured to implement the air-fuel ratio control method as described in any one of claims 1 to 7 when executing the computer program.

10. A vehicle, characterized in that, Includes the electronic device as described in claim 9.

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