An engine control method, device, vehicle and computer readable storage medium

Abstract

The application discloses an engine control method, device, vehicle and computer readable storage medium, and relates to the technical field of engine control. The engine control method comprises the following steps: acquiring pressure values of symmetrical positions on two sides of an engine intake system respectively; judging whether the engine intake system leaks according to a difference between the pressure values of the symmetrical positions on the two sides of the engine intake system; determining a leakage position of the engine intake system according to a relationship between the pressure values of the symmetrical positions on the two sides of the engine intake system and atmospheric pressure; and adjusting an injection amount of a side of the engine intake system that leaks when the engine intake system leaks according to a deviation of the pressure values of the symmetrical positions on the two sides of the engine intake system.

Description

Technical Field

[0001] This invention relates to the field of automotive engine control, and more particularly to an engine control method, device, vehicle, and computer-readable storage medium. Background Technology

[0002] In a vehicle, the engine is a very important and complex assembly component, the heart of the car. Once the engine fails, it will have serious consequences, even endangering the lives of the driver and passengers. Therefore, engine failure should not be underestimated in daily use. All factors must be considered to minimize engine failure, detect failure in time, and take safe and effective control measures to ensure the safety, comfort, and economy of the vehicle.

[0003] During use, turbocharged engines inevitably experience air leaks in the intake system or pipe ruptures. In such cases, the air-fuel mixture ratio in the engine cylinder becomes unbalanced, failing to achieve the normal mixture concentration. This leads to abnormal combustion of the air-fuel mixture in the engine cylinder, resulting in increased fuel consumption, worsened exhaust pollutants, abnormal engine power output, and even engine malfunctions, shaking, or stalling. Summary of the Invention

[0004] This invention provides an engine control method, device, vehicle, and computer-readable storage medium to solve the problem of abnormal combustion of the air-fuel mixture in the engine cylinder when the intake system leaks.

[0005] According to one aspect of the present invention, an engine control method is provided, the method comprising:

[0006] Obtain the pressure values ​​at symmetrical positions on both sides of the engine intake system;

[0007] The difference in pressure values ​​at symmetrical positions on both sides of the engine intake system is used to determine whether the intake system is leaking, and the location of the leak is determined based on the relationship between the pressure values ​​at symmetrical positions on both sides of the engine intake system and atmospheric pressure.

[0008] When the intake system leaks air, the fuel injection volume on the leaking side of the engine intake system is adjusted according to the pressure value deviation at symmetrical positions on both sides of the engine intake system.

[0009] Optionally, determining whether the intake system is leaking based on the pressure difference at symmetrical positions on both sides of the engine intake system includes:

[0010] Calculate the absolute value of the pressure difference at symmetrical positions on both sides of the engine intake system;

[0011] Determine whether the absolute value of the pressure difference between symmetrical positions on both sides of the engine intake system is greater than a first threshold. If it is, then the intake system is leaking air; if not, then the intake system is not leaking air.

[0012] Optionally, determining the location of the air leak in the intake system based on the relationship between the pressure values ​​at symmetrical positions on both sides of the engine intake system and atmospheric pressure includes:

[0013] Obtain the minimum pressure value at symmetrical positions on both sides of the engine intake system;

[0014] Determine whether the minimum pressure value at symmetrical positions on both sides of the engine intake system is greater than atmospheric pressure. If so, the air leakage location of the intake system is the side with the smaller pressure value at the symmetrical positions on both sides of the engine intake system. If not, the air leakage location of the intake system is the side with the larger pressure value at the symmetrical positions on both sides of the engine intake system.

[0015] Optionally, adjusting the fuel injection quantity on the leaking side of the engine intake system based on the pressure deviation at symmetrical positions on both sides of the engine intake system when the intake system leaks includes:

[0016] When the intake system leaks air, and the minimum pressure value at symmetrical positions on both sides of the engine intake system is greater than the atmospheric pressure, calculate the absolute value of the difference between the pressure values ​​at symmetrical positions on both sides of the engine intake system.

[0017] If the absolute value of the pressure difference between the two symmetrical positions of the engine intake system is greater than a second threshold, and the absolute value of the pressure difference between the two symmetrical positions of the engine intake system is less than or equal to the second threshold, then the fuel injection amount on the side with the smaller pressure value at the symmetrical position of the engine intake system is reduced according to the first fuel injection correction amount. If the absolute value of the pressure difference between the two symmetrical positions of the engine intake system is greater than the second threshold, then the absolute value of the pressure difference between the two symmetrical positions of the engine intake system is greater than a third threshold. If the absolute value of the pressure difference between the two symmetrical positions of the engine intake system is less than or equal to the third threshold, then the fuel injection amount on the side with the smaller pressure value at the symmetrical position of the engine intake system is reduced according to the second fuel injection correction amount.

[0018] The first injection correction amount is proportional to the absolute value of the difference between the pressure values ​​at symmetrical positions on both sides of the engine intake system, the second injection correction amount is a constant value, and the second injection correction amount is greater than or equal to the first injection correction amount.

[0019] Optionally, adjusting the fuel injection quantity on the leaking side of the engine intake system based on the pressure deviation at symmetrical positions on both sides of the engine intake system when the intake system leaks includes:

[0020] When the intake system leaks air, and the minimum pressure value at symmetrical positions on both sides of the engine intake system is less than the atmospheric pressure, calculate the absolute value of the difference between the pressure values ​​at symmetrical positions on both sides of the engine intake system.

[0021] If the absolute value of the pressure difference between the two symmetrical positions on both sides of the engine intake system is greater than a second threshold, and the absolute value of the pressure difference between the two symmetrical positions on both sides of the engine intake system is less than or equal to the second threshold, then the fuel injection quantity on the side with the larger pressure value at the symmetrical position of the engine intake system is increased according to the first fuel injection correction amount. If the absolute value of the pressure difference between the two symmetrical positions on both sides of the engine intake system is greater than the second threshold, then the absolute value of the pressure difference between the two symmetrical positions on both sides of the engine intake system is greater than a third threshold. If the absolute value of the pressure difference between the two symmetrical positions on both sides of the engine intake system is less than or equal to the third threshold, then the fuel injection quantity on the side with the larger pressure value at the symmetrical position of the engine intake system is increased according to the second fuel injection correction amount.

[0022] The first injection correction amount is proportional to the absolute value of the difference between the pressure values ​​at symmetrical positions on both sides of the engine intake system, the second injection correction amount is a constant value, and the second injection correction amount is greater than or equal to the first injection correction amount.

[0023] Optionally, after determining whether the intake system is leaking based on the pressure difference at symmetrical positions on both sides of the engine intake system, and determining the location of the leak based on the relationship between the pressure values ​​at symmetrical positions on both sides of the engine intake system and atmospheric pressure, the method further includes:

[0024] When the absolute value of the pressure difference between the two symmetrical positions on both sides of the engine intake system is greater than the third threshold, the torque and speed of the engine are reduced to bring the engine down to a safe operating condition.

[0025] Optionally, after determining whether the intake system is leaking based on the pressure difference at symmetrical positions on both sides of the engine intake system, and determining the location of the leak based on the relationship between the pressure values ​​at symmetrical positions on both sides of the engine intake system and atmospheric pressure, the method further includes:

[0026] When an air leak occurs in the intake system, an air leak alarm signal is issued.

[0027] According to another aspect of the present invention, an engine control device is provided, the device comprising:

[0028] The pressure value acquisition module is used to acquire the pressure values ​​at symmetrical positions on both sides of the engine intake system.

[0029] The air leakage detection module is used to determine whether the air intake system is leaking based on the pressure values ​​at symmetrical positions on both sides of the engine air intake system, and to determine the location of the air leakage based on the relationship between the pressure values ​​at symmetrical positions on both sides of the engine air intake system and atmospheric pressure.

[0030] The fuel injection quantity adjustment module is used to adjust the fuel injection quantity on the leaking side of the engine based on the pressure value deviation at symmetrical positions on both sides of the engine intake system when the intake system leaks.

[0031] According to another aspect of the present invention, a vehicle is provided, the vehicle comprising:

[0032] At least one processor;

[0033] and a memory communicatively connected to the 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 any of the engine control methods 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 any of the above-described engine control methods.

[0036] The technical solution of this invention adjusts the air-fuel mixture ratio in the engine cylinder when there is air leakage in the engine intake system, so that the concentration of the air-fuel mixture reaches the normal ratio, thereby ensuring normal combustion of the air-fuel mixture in the engine cylinder and avoiding increased engine fuel consumption, deterioration of exhaust pollutants, abnormal engine power output, engine malfunction, shaking, or stalling.

[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 of an engine control method provided in Embodiment 1 of the present invention;

[0040] Figure 2 This is a schematic diagram of the structure of an engine provided in Embodiment 1 of the present invention;

[0041] Figure 3 A flowchart of another engine control method provided in Embodiment 2 of the present invention;

[0042] Figure 4 A flowchart of another engine control method provided in Embodiment 3 of the present invention;

[0043] Figure 5 This is a schematic diagram of the structure of an engine control device provided in Embodiment 4 of the present invention;

[0044] Figure 6 This is a structural schematic diagram of a vehicle provided in Embodiment 5 of the present invention. Detailed Implementation

[0045] 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.

[0046] 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.

[0047] Example 1

[0048] Figure 1 This is a flowchart of an engine control method provided in Embodiment 1 of the present invention. This method can be executed by an engine control device, which can be implemented in hardware and / or software, and can be configured in a vehicle. Figure 1 As shown, the method includes:

[0049] S110: Obtain the pressure values ​​at symmetrical positions on both sides of the engine intake system.

[0050] Specifically, refer to Figure 2 , Figure 2 This is a schematic diagram of the structure of an engine provided in Embodiment 1 of the present invention, as shown below. Figure 2 As shown, the engine intake system includes two symmetrical banks, bank 1 and bank 2. An intake flow meter 1-1 (2-1), an intercooler pressure sensor 1-2 (2-2), a manifold pressure sensor 1-3 (2-3), and an oxygen sensor 1-4 (2-4) are respectively installed at symmetrical positions on banks 1 and 2. In this embodiment, the intercooler pressure value at the symmetrical positions on banks 1 and 2 can be obtained through the intercooler pressure sensor 1-2 (2-2) on the symmetrical positions on banks 1 and 2, or the manifold pressure value at the symmetrical positions on banks 1 and 2 can be obtained through the manifold pressure sensor 1-3 (2-3) on the symmetrical positions on banks 1 and 2.

[0051] S120. Determine whether the intake system is leaking by the pressure difference between the two symmetrical positions on both sides of the engine intake system, and determine the location of the leak by the relationship between the pressure values ​​at the two symmetrical positions on both sides of the engine intake system and atmospheric pressure.

[0052] Specifically, when an engine intake system leaks, the pressure at symmetrical locations on both sides of the system will deviate. Therefore, the difference in pressure at these locations can be used to determine if there is a leak. If the difference is greater than normal, a leak is confirmed. Once a leak is identified, the location is determined based on the relationship between the pressure at these symmetrical locations and atmospheric pressure. For example, an atmospheric pressure sensor located inside the engine's electronic control unit can obtain the current atmospheric pressure. If the pressure at these locations is greater than atmospheric pressure (meaning the intake system is under positive pressure relative to the outside), a leak will cause gas to leak from the leaking side, resulting in lower pressure on the leaking side compared to the non-leaking side. If the pressure values ​​at symmetrical positions on both sides of the engine intake system are less than atmospheric pressure, meaning that the inside of the engine intake system is under negative pressure relative to the outside of the vehicle, when an air leak occurs in the intake system, the gas outside the vehicle will diffuse into the engine intake system on the leaking side under the influence of the external atmospheric pressure. In other words, the pressure of the intake system on the leaking side will be greater than the pressure of the intake system on the non-leaking side.

[0053] S130. When the intake system leaks, adjust the fuel injection amount on the leaking side of the engine intake system according to the pressure value deviation at symmetrical positions on both sides of the engine intake system.

[0054] Specifically, under normal conditions, the engine's electronic control unit calculates the relative fuel injection quantity based on the intake air volume measured by the intake flow meter 1-1 (2-1) and the target air-fuel ratio to precisely control the engine's air-fuel ratio, ensuring normal combustion of the air-fuel mixture in the engine cylinder. When there is a leak in the engine's intake system, the intake air volume measured by the intake flow meter 1-1 (2-1) is inconsistent with the intake air volume entering the engine cylinder, resulting in a certain deviation. Therefore, fuel injection according to the fuel injection quantity calculated by the engine's electronic control unit will lead to an imbalance in the air-fuel mixture ratio in the engine cylinder, making it impossible to achieve a normal mixture concentration. This will cause abnormal combustion in the engine, resulting in increased fuel consumption, worsened exhaust pollutants, abnormal engine power output, and even engine malfunctions, shaking, or stalling. Therefore, when the intake system leaks, the technical solution of this invention can adjust the fuel injection quantity on the leaking side of the engine intake system, thereby avoiding the problem of imbalance in the air-fuel mixture ratio in the engine cylinder. It is easy to understand that the greater the pressure deviation at symmetrical positions on both sides of the engine intake system, the more severe the leak on the leaking side, and thus the greater the adjustment of the fuel injection quantity on the leaking side. The technical solution of this invention can adjust the fuel injection quantity on the leaking side of the engine intake system according to the pressure deviation at symmetrical positions on both sides. The greater the pressure deviation, the greater the adjustment of the fuel injection quantity on the leaking side, enabling the adjustment of the air-fuel mixture ratio in the engine cylinder when the engine intake system leaks, ensuring the air-fuel mixture concentration reaches a normal ratio, guaranteeing normal combustion of the air-fuel mixture in the engine cylinder, and preventing increased fuel consumption, worsened exhaust pollutants, abnormal engine power output, engine malfunction, vibration, or stalling.

[0055] The engine control method provided in this embodiment of the invention includes acquiring pressure values ​​at symmetrical positions on both sides of the engine intake system, determining whether the intake system is leaking based on the difference in pressure values ​​at the symmetrical positions on both sides of the engine intake system, determining the location of the leak based on the relationship between the pressure values ​​at the symmetrical positions on both sides of the engine intake system and atmospheric pressure, and adjusting the fuel injection quantity on the leaking side of the engine intake system according to the deviation in pressure values ​​at the symmetrical positions on both sides of the engine intake system when the engine intake system is leaking. This method can adjust the air-fuel mixture ratio in the engine cylinder when the engine intake system is leaking, so that the concentration of the air-fuel mixture reaches a normal ratio, thereby ensuring normal combustion of the air-fuel mixture in the engine cylinder.

[0056] Example 2

[0057] Figure 3 A flowchart of another engine control method provided in Embodiment 2 of the present invention is shown below. Figure 3 As shown, the method includes:

[0058] S210: Obtain the pressure values ​​at symmetrical positions on both sides of the engine intake system.

[0059] S221. Calculate the absolute value of the pressure difference between symmetrical positions on both sides of the engine intake system.

[0060] S222. Determine whether the absolute value of the pressure difference between the two symmetrical positions on both sides of the engine intake system is greater than the first threshold. If yes, the intake system is leaking, and execute S223. If no, the intake system is not leaking, and return to execute S210.

[0061] Specifically, due to slight differences in manufacturing processes or measurement errors, even when there is no air leakage in the engine intake system, there may be slight deviations in pressure at symmetrical positions on both sides of the system. Therefore, if the absolute value of the pressure difference between the symmetrical positions on both sides of the intake system is less than a first threshold, the deviation can be considered within the normal range, and the intake system is deemed to be leak-free. In this embodiment, the first threshold can be obtained through multiple measurements and statistical analysis or set based on experience.

[0062] S223. Obtain the minimum pressure value at symmetrical positions on both sides of the engine intake system.

[0063] S2241. Determine whether the minimum pressure value at the symmetrical positions on both sides of the engine intake system is greater than atmospheric pressure. If yes, execute S2242; otherwise, execute S2243.

[0064] S2242. The air leak location in the intake system is the side with the lower pressure value at a symmetrical location on both sides of the engine intake system.

[0065] S2243. The air leak location in the intake system is the side with the higher pressure value at a symmetrical location on both sides of the engine intake system.

[0066] Specifically, when the absolute value of the pressure difference between the two symmetrical positions on both sides of the engine intake system is greater than the first threshold, it is determined that the intake system is leaking. At this time, the location of the leak can be determined by comparing the minimum pressure value at the two symmetrical positions on both sides of the engine intake system with atmospheric pressure. Specifically, the atmospheric pressure value can be obtained by an atmospheric pressure sensor located inside the engine electronic control unit. When the minimum pressure value at the two symmetrical positions on both sides of the engine intake system is greater than atmospheric pressure, that is, the internal pressure of the engine intake system is positive relative to the outside of the vehicle. If there is a leak in the intake system on one side, the gas inside the intake system on the leaking side will leak to the outside of the vehicle. That is, the pressure of the intake system on the leaking side will be lower than the pressure of the intake system on the non-leaking side. Therefore, the location of the leak in the intake system is determined to be the side with the smaller pressure value at the two symmetrical positions on both sides of the engine intake system. When the minimum pressure value at symmetrical positions on both sides of the engine intake system is less than atmospheric pressure, the inside of the engine intake system is under negative pressure compared to the outside of the vehicle. If there is a leak in the intake system on one side, the gas outside the vehicle will diffuse into the engine intake system on the leaking side under the action of atmospheric pressure. In other words, the pressure of the intake system on the leaking side will be greater than the pressure of the intake system on the non-leaking side. Therefore, it can be determined that the leaking position of the intake system is the side with the larger pressure value at symmetrical positions on both sides of the engine intake system.

[0067] S225. Issue a leak alarm signal when an air leak occurs in the intake system.

[0068] Specifically, when an air leak occurs in the intake system, the engine electronic control unit can send a leak warning signal to the driver to remind them of the leak and its location. This prompts the driver to promptly inspect and repair the leak in the engine intake system, ensuring vehicle safety and the safety of the driver and passengers.

[0069] S230. When the intake system leaks, adjust the fuel injection amount on the leaking side of the engine intake system according to the pressure value deviation at symmetrical positions on both sides of the engine intake system.

[0070] The engine control method provided in this embodiment of the invention determines whether the engine intake system is leaking by judging whether the absolute value of the pressure difference between the two symmetrical positions on both sides of the engine intake system is greater than a first threshold. When the intake system is leaking, the method determines the location of the leak by judging whether the minimum pressure value at the two symmetrical positions on both sides of the engine intake system is greater than atmospheric pressure. The method adjusts the fuel injection quantity on the leaking side of the engine intake system according to the pressure deviation at the two symmetrical positions on both sides of the engine intake system. This allows the method to adjust the air-fuel mixture ratio in the engine cylinder when the engine intake system is leaking, so that the concentration of the air-fuel mixture reaches a normal ratio, thereby ensuring normal combustion of the air-fuel mixture in the engine cylinder.

[0071] Example 3

[0072] Figure 4 A flowchart of another engine control method provided in Embodiment 3 of the present invention is shown below. Figure 4 As shown, the method includes:

[0073] S310: Obtain the pressure values ​​at symmetrical positions on both sides of the engine intake system.

[0074] S321. Calculate the absolute value of the pressure difference between symmetrical positions on both sides of the engine intake system.

[0075] S322. Determine whether the absolute value of the pressure difference between the two symmetrical positions on both sides of the engine intake system is greater than the first threshold. If yes, the intake system is leaking, and execute S223. If no, the intake system is not leaking, and return to execute S210.

[0076] S323, Obtain the minimum pressure value at symmetrical positions on both sides of the engine intake system.

[0077] S3241. Determine whether the minimum pressure value at the symmetrical positions on both sides of the engine intake system is greater than atmospheric pressure. If yes, execute S3242; otherwise, execute S3243.

[0078] S3242, The air leak location in the intake system is the side with the lower pressure value at a symmetrical location on both sides of the engine intake system.

[0079] S3243, The air leak location in the intake system is the side with the higher pressure value at a symmetrical location on both sides of the engine intake system.

[0080] Optional, continue to refer to Figure 4 When an air leak occurs in the intake system and the minimum pressure value at symmetrical positions on both sides of the engine intake system is greater than atmospheric pressure, S3311 is executed.

[0081] S3311. Calculate the absolute value of the pressure difference between symmetrical positions on both sides of the engine intake system.

[0082] S3312. Determine whether the absolute value of the pressure difference between the two symmetrical positions on both sides of the engine intake system is greater than the second threshold. If not, execute S3313. If not, execute S3314.

[0083] S3313. Reduce the fuel injection amount on the side with the smaller pressure value at the symmetrical position of the engine intake system according to the first fuel injection correction amount.

[0084] S3314. Determine whether the absolute value of the pressure difference between the two symmetrical positions on both sides of the engine intake system is greater than the third threshold. If not, execute S3315; if yes, execute S340.

[0085] S3315. Reduce the fuel injection amount on the side with the smaller pressure value at the symmetrical position of the engine intake system according to the second fuel injection correction amount.

[0086] S340, reduces engine torque and speed.

[0087] The first injection correction amount is proportional to the absolute value of the difference between the pressure values ​​at symmetrical positions on both sides of the engine intake system, and the second injection correction amount is a constant value, which is greater than or equal to the first injection correction amount.

[0088] Specifically, when an air leak occurs in the intake system, if the absolute value of the pressure difference between symmetrical positions on both sides of the engine's intake system is greater than a first threshold and less than or equal to a second threshold, it can be considered that the air leak in the engine's intake system is not serious and will not affect the normal operation of the engine, but it will affect the control accuracy of the engine's various controllers. In this case, the fuel injection quantity on the leaking side of the intake system can be corrected to adjust the air-fuel mixture ratio in the engine cylinders, so that the concentration of the air-fuel mixture reaches the normal ratio, allowing the engine to resume normal operation. When the absolute value of the pressure difference between symmetrical positions on both sides of the engine's intake system is greater than a second threshold and less than or equal to a third threshold, it can be considered that the air leak in the engine's intake system is serious. In this case, it is necessary to correct the fuel injection quantity on the leaking side of the intake system to the maximum extent to reduce the degree of abnormal engine operation. When the absolute value of the pressure difference between the two symmetrical positions on both sides of the engine intake system exceeds the third threshold, it can be determined that the engine intake system may be experiencing a serious accident such as a pipe rupture. The engine and even the entire vehicle are in an unsafe state. At this time, the engine electronic control unit reduces the engine torque and speed to bring the engine down to a safe operating condition, thereby reducing the vehicle speed and providing the driver with valuable time for safe emergency response, avoiding more serious accidents, and ensuring the safety of the vehicle and the lives and property of the driver and passengers.

[0089] In this embodiment, when an air leak occurs in the intake system, and the minimum pressure value at symmetrical positions on both sides of the engine intake system is greater than atmospheric pressure, as mentioned above, this indicates that the leak occurs on the side with the smaller pressure value at the symmetrical position of the engine intake system. The gas inside the intake system on the leaking side will leak to the outside of the vehicle. That is, the pressure inside the intake system on the leaking side is lower than the pressure on the non-leaking side, resulting in less gas entering the engine cylinder and an increase in the air-fuel ratio in the engine cylinder. At this time, the fuel injection amount on the side with the smaller pressure value at the symmetrical position of the engine intake system is reduced according to the first fuel injection correction amount, so that the air-fuel ratio in the engine cylinder returns to the normal value. It's easy to understand that the greater the pressure difference between the two symmetrical positions of the engine intake system (the absolute value of the pressure difference between the two symmetrical positions of the engine intake system is greater than the first threshold and less than or equal to the second threshold), the more severe the air leakage. The less gas enters the engine cylinder from the leaking side of the intake system, and the greater the air-fuel ratio in the engine cylinder. At this time, the amount of fuel injection adjustment required on the side with the smaller pressure value of the symmetrical position of the engine intake system is also greater. Therefore, when the absolute value of the pressure difference between the two symmetrical positions of the engine intake system is greater than the first threshold and less than or equal to the second threshold, the amount of correction (reduction) of the fuel injection on the side with the smaller pressure value of the symmetrical position of the engine intake system is proportional to the absolute value of the pressure difference between the two symmetrical positions of the engine intake system. This allows for the adjustment of the fuel injection on the leaking side of the engine intake system as needed, so that the concentration of the air-fuel mixture reaches the normal ratio, ensuring normal combustion of the air-fuel mixture in the engine cylinder. When the pressure difference between the two symmetrical positions of the engine intake system increases further (the absolute value of the pressure difference between the two symmetrical positions of the engine intake system is greater than the second threshold and less than or equal to the third threshold), the fuel injection quantity on the side with the smaller pressure value at the symmetrical position of the engine intake system can be corrected to the maximum extent according to the second fuel injection correction amount, so as to reduce the degree of abnormal engine operation. In this embodiment, the second fuel injection correction amount is a fixed value that is greater than or equal to the first fuel injection correction amount.

[0090] Optional, continue to refer to Figure 4 When an air leak occurs in the intake system and the minimum pressure value at the symmetrical positions on both sides of the engine intake system is less than atmospheric pressure, S3321 is executed.

[0091] S3321. Calculate the absolute value of the pressure difference between symmetrical positions on both sides of the engine intake system.

[0092] S3322. Determine whether the absolute value of the pressure difference between the two symmetrical positions on both sides of the engine intake system is greater than the second threshold. If not, execute S3323. If not, execute S3324.

[0093] S3323. Increase the fuel injection quantity on the side with the larger pressure value at the symmetrical position of the engine intake system according to the first fuel injection correction amount.

[0094] S3324. Determine whether the absolute value of the pressure difference between the two symmetrical positions on both sides of the engine intake system is greater than the third threshold. If not, execute S3325; if yes, execute S340.

[0095] S3325. Increase the fuel injection quantity on the side with the larger pressure value at the symmetrical position of the engine intake system according to the second fuel injection correction amount.

[0096] S340, reduces engine torque and speed.

[0097] The first injection correction amount is proportional to the absolute value of the difference between the pressure values ​​at symmetrical positions on both sides of the engine intake system, and the second injection correction amount is a constant value, which is greater than or equal to the first injection correction amount.

[0098] In this embodiment, when an air leak occurs in the intake system, and the minimum pressure value at the symmetrical positions on both sides of the engine intake system is less than atmospheric pressure, as mentioned above, the leak occurs on the side with the higher pressure value at the symmetrical position of the engine intake system. Under the influence of external atmospheric pressure, external gas will diffuse into the engine intake system on the leaking side. That is, the pressure inside the intake system on the leaking side is higher than the pressure on the non-leaking side, resulting in more gas entering the engine cylinder. The air-fuel ratio in the engine cylinder will decrease. At this time, the fuel injection quantity on the side with the higher pressure value at the symmetrical position of the engine intake system is increased according to the first fuel injection correction amount, thereby bringing the air-fuel ratio in the engine cylinder back to the normal value. It's easy to understand that the greater the pressure difference between the two symmetrical positions of the engine intake system (the absolute value of the pressure difference between the two symmetrical positions of the engine intake system is greater than the first threshold and less than or equal to the second threshold), the more severe the air leakage. More gas enters the engine cylinder from the leaking side of the intake system, resulting in a lower air-fuel ratio in the engine cylinder. Therefore, the adjustment amount of fuel injection on the side with the larger pressure value in the symmetrical position of the engine intake system needs to be greater. Thus, when the absolute value of the pressure difference between the two symmetrical positions of the engine intake system is greater than the first threshold and less than or equal to the second threshold, the correction amount (increase) of the fuel injection amount on the side with the larger pressure value in the symmetrical position of the engine intake system is proportional to the absolute value of the pressure difference between the two symmetrical positions. This allows for the adjustment of the fuel injection amount on the leaking side of the engine intake system as needed, ensuring that the air-fuel mixture concentration reaches a normal ratio and guaranteeing normal combustion of the air-fuel mixture in the engine cylinder. When the pressure difference between the two symmetrical positions of the engine intake system further increases (the absolute value of the pressure difference between the two symmetrical positions of the engine intake system is greater than the second threshold and less than or equal to the third threshold), the fuel injection quantity on the side with the larger pressure value at the symmetrical position of the engine intake system can be corrected to the maximum extent according to the second fuel injection correction amount, so as to reduce the degree of abnormal engine operation. In this embodiment, the second fuel injection correction amount is a fixed value that is greater than or equal to the first fuel injection correction amount. When the absolute value of the pressure difference between the two symmetrical positions of the engine intake system is greater than the third threshold, it can be determined that the engine intake system may have a serious accident such as a pipe rupture. The engine and even the entire vehicle are in an unsafe state. At this time, the engine electronic control unit reduces the engine torque and speed to bring the engine down to a safe operating condition, thereby reducing the vehicle speed and providing valuable time for the driver to take safe emergency measures, avoiding more serious accidents, and ensuring the safety of the vehicle and the lives and property of the driver and passengers.

[0099] Example 4

[0100] Figure 5 This is a schematic diagram of the structure of an engine control device provided in Embodiment 4 of the present invention, as shown below. Figure 5 As shown, the device includes:

[0101] The pressure value acquisition module 10 is used to acquire the pressure values ​​at symmetrical positions on both sides of the engine intake system.

[0102] The air leakage detection module 20 is used to determine whether the air intake system is leaking based on the pressure values ​​at symmetrical positions on both sides of the engine air intake system, and to determine the location of the air leakage based on the relationship between the pressure values ​​at symmetrical positions on both sides of the engine air intake system and atmospheric pressure.

[0103] The fuel injection quantity adjustment module 30 is used to adjust the fuel injection quantity on the leaking side of the engine according to the pressure value deviation at symmetrical positions on both sides of the engine intake system when there is air leakage in the intake system.

[0104] The engine control device provided in this embodiment of the invention includes a pressure value acquisition module for acquiring pressure values ​​at symmetrical positions on both sides of the engine intake system; a leakage detection module for determining whether the intake system is leaking based on the pressure values ​​at the symmetrical positions on both sides of the engine intake system, and determining the location of the leak based on the relationship between the pressure values ​​at the symmetrical positions on both sides of the engine intake system and atmospheric pressure; and a fuel injection quantity adjustment module for adjusting the fuel injection quantity on the leaking side of the engine based on the deviation of the pressure values ​​at the symmetrical positions on both sides of the engine intake system when there is a leak. This allows for adjusting the air-fuel mixture ratio in the engine cylinders when there is a leak in the engine intake system, ensuring that the concentration of the air-fuel mixture reaches a normal ratio to guarantee normal combustion of the air-fuel mixture in the engine cylinders.

[0105] Example 5

[0106] Figure 6 This is a structural schematic diagram of a vehicle provided in Embodiment 5 of the present invention. Figure 6 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 6 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 6 Taking the example of a connection between China and Israel via a bus.

[0107] The memory 41 serves as a storage medium and can be used to store software programs, computer-executable programs, and modules, such as the program module corresponding to the engine control method in this embodiment of the invention. The processor 40 executes various functional applications and data processing of the system by running the software programs, instructions, and modules stored in the memory 41, thereby realizing the aforementioned engine control method.

[0108] 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.

[0109] Example 6

[0110] Embodiment 6 of the present invention also provides a computer-readable storage medium containing computer instructions for causing a processor to execute any of the engine control methods described in the above embodiments.

[0111] 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 no limitation is imposed herein.

[0112] 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. An engine control method, characterized in that, include: Obtain the pressure values ​​at symmetrical positions on both sides of the engine intake system; The difference in pressure values ​​at symmetrical positions on both sides of the engine intake system is used to determine whether the intake system is leaking, and the location of the leak is determined based on the relationship between the pressure values ​​at symmetrical positions on both sides of the engine intake system and atmospheric pressure. When the intake system leaks air, the fuel injection amount on the leaking side of the engine intake system is adjusted according to the pressure value deviation at symmetrical positions on both sides of the engine intake system. Determining the location of air leakage in the intake system based on the relationship between the pressure values ​​at symmetrical positions on both sides of the engine intake system and atmospheric pressure includes: Obtain the minimum pressure value at symmetrical positions on both sides of the engine intake system; Determine whether the minimum pressure value at symmetrical positions on both sides of the engine intake system is greater than atmospheric pressure. If so, the air leakage location of the intake system is the side with the smaller pressure value at the symmetrical positions on both sides of the engine intake system. If not, the air leakage location of the intake system is the side with the larger pressure value at the symmetrical positions on both sides of the engine intake system.

2. The engine control method according to claim 1, characterized in that, The step of determining whether the intake system is leaking based on the pressure difference at symmetrical positions on both sides of the engine intake system includes: Calculate the absolute value of the pressure difference at symmetrical positions on both sides of the engine intake system; Determine whether the absolute value of the pressure difference between symmetrical positions on both sides of the engine intake system is greater than a first threshold. If it is, then the intake system is leaking air; if not, then the intake system is not leaking air.

3. The engine control method according to claim 1, characterized in that, The adjustment of the fuel injection quantity on the leaking side of the engine intake system based on the pressure deviation at symmetrical positions on both sides of the engine intake system when the intake system leaks includes: When the intake system leaks air, and the minimum pressure value at symmetrical positions on both sides of the engine intake system is greater than the atmospheric pressure, calculate the absolute value of the difference between the pressure values ​​at symmetrical positions on both sides of the engine intake system. If the absolute value of the pressure difference between the two symmetrical positions of the engine intake system is greater than a second threshold, and the absolute value of the pressure difference between the two symmetrical positions of the engine intake system is less than or equal to the second threshold, then the fuel injection amount on the side with the smaller pressure value at the symmetrical position of the engine intake system is reduced according to the first fuel injection correction amount. If the absolute value of the pressure difference between the two symmetrical positions of the engine intake system is greater than the second threshold, then the absolute value of the pressure difference between the two symmetrical positions of the engine intake system is greater than a third threshold. If the absolute value of the pressure difference between the two symmetrical positions of the engine intake system is less than or equal to the third threshold, then the fuel injection amount on the side with the smaller pressure value at the symmetrical position of the engine intake system is reduced according to the second fuel injection correction amount. The first injection correction amount is proportional to the absolute value of the difference between the pressure values ​​at symmetrical positions on both sides of the engine intake system, the second injection correction amount is a constant value, and the second injection correction amount is greater than or equal to the first injection correction amount.

4. The engine control method according to claim 1, characterized in that, The adjustment of the fuel injection quantity on the leaking side of the engine intake system based on the pressure deviation at symmetrical positions on both sides of the engine intake system when the intake system leaks includes: When the intake system leaks air, and the minimum pressure value at symmetrical positions on both sides of the engine intake system is less than the atmospheric pressure, calculate the absolute value of the difference between the pressure values ​​at symmetrical positions on both sides of the engine intake system. If the absolute value of the pressure difference between the two symmetrical positions on both sides of the engine intake system is greater than a second threshold, and the absolute value of the pressure difference between the two symmetrical positions on both sides of the engine intake system is less than or equal to the second threshold, then the fuel injection quantity on the side with the larger pressure value at the symmetrical position of the engine intake system is increased according to the first fuel injection correction amount. If the absolute value of the pressure difference between the two symmetrical positions on both sides of the engine intake system is greater than the second threshold, then the absolute value of the pressure difference between the two symmetrical positions on both sides of the engine intake system is greater than a third threshold. If the absolute value of the pressure difference between the two symmetrical positions on both sides of the engine intake system is less than or equal to the third threshold, then the fuel injection quantity on the side with the larger pressure value at the symmetrical position of the engine intake system is increased according to the second fuel injection correction amount. The first injection correction amount is proportional to the absolute value of the difference between the pressure values ​​at symmetrical positions on both sides of the engine intake system, the second injection correction amount is a constant value, and the second injection correction amount is greater than or equal to the first injection correction amount.

5. The engine control method according to claim 1, characterized in that, After determining whether the intake system is leaking based on the pressure difference at symmetrical positions on both sides of the engine intake system, and determining the location of the leak based on the relationship between the pressure values ​​at symmetrical positions on both sides of the engine intake system and atmospheric pressure, the method further includes: When the absolute value of the pressure difference between the two symmetrical positions on both sides of the engine intake system is greater than the third threshold, the torque and speed of the engine are reduced to bring the engine down to a safe operating condition.

6. The engine control method according to claim 1, characterized in that, After determining whether the intake system is leaking based on the pressure difference at symmetrical locations on both sides of the engine intake system, and determining the location of the leak based on the relationship between the pressure values ​​at symmetrical locations on both sides of the engine intake system and atmospheric pressure, the method further includes: When an air leak occurs in the intake system, an air leak alarm signal is issued.

7. An engine control device capable of executing the engine control method according to any one of claims 1-6, characterized in that, include: The pressure value acquisition module is used to acquire the pressure values ​​at symmetrical positions on both sides of the engine intake system. The air leakage detection module is used to determine whether the air intake system is leaking based on the pressure values ​​at symmetrical positions on both sides of the engine air intake system, and to determine the location of the air leakage based on the relationship between the pressure values ​​at symmetrical positions on both sides of the engine air intake system and atmospheric pressure. The fuel injection quantity adjustment module is used to adjust the fuel injection quantity on the leaking side of the engine based on the pressure value deviation at symmetrical positions on both sides of the engine intake system when the intake system leaks.

8. A vehicle, characterized in that, The vehicles include: At least one processor; and a memory communicatively connected to the 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 engine control method according to any one of claims 1-6.

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

Images