Vehicle engine alcohol flexible fuel control method, device, equipment and medium

Abstract

The embodiment of the application provides a kind of vehicle engine alcohol flexible fuel control method, device, equipment and medium, the method comprises: obtaining the knock intensity of vehicle engine current time;Determine the alcohol content in alcohol flexible fuel in vehicle engine based on knock intensity;Determine the target operating parameter of vehicle engine based on alcohol content, target operating parameter at least includes target injection pulse width and target ignition advance angle;Adjust the operating parameter of vehicle engine current time based on target operating parameter.The embodiment of the application can quickly improve the identification efficiency and accuracy of alcohol content, and improve the combustion efficiency of vehicle engine.

Description

Technical Field

[0001] This application belongs to the field of vehicle control technology, and in particular relates to a control method, device, equipment and medium for alcohol-based flexible fuels in vehicle engines. Background Technology

[0002] Alcohol-fueled engines often employ a fixed-ratio adaptation scheme, such as supporting only single grades like E10 and E85, or relying on additional fuel component sensors (such as ethanol concentration sensors) for identification, and then controlling the engine based on the obtained alcohol content. However, this type of method is overly dependent on sensors, has high costs, and can only identify a single type of alcohol, making it impossible to adapt to various alcohol contents, resulting in low identification accuracy.

[0003] Therefore, it is necessary to provide a method for controlling alcohol-based flexible fuels in vehicle engines to solve the problems existing in the prior art. Summary of the Invention

[0004] The embodiments of this application provide a method, apparatus, device, and medium for controlling flexible alcohol fuels in vehicle engines, which solves the problems of excessive reliance on sensors in the prior art, high cost, and the inability to identify only a single alcohol, thus failing to adapt to various alcohol contents and resulting in low identification accuracy.

[0005] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0006] According to a first aspect of the embodiments of this application, a method for controlling alcohol-based flexible fuels in a vehicle engine is provided, the method comprising: Obtain the current knock intensity of the vehicle engine; Based on the knock intensity, determine the alcohol content in the alcohol flexible fuel in the vehicle engine; Based on the alcohol content, the target operating parameters of the vehicle engine are controlled. The target operating parameters include at least the target injection pulse width and the target ignition advance angle.

[0007] In some embodiments of this application, determining the alcohol content in a flexible alcohol fuel in a vehicle engine based on knock intensity includes: Obtain the current knock intensity of the vehicle engine; Based on the knock intensity, determine the alcohol content in the alcohol flexible fuel in the vehicle engine; Based on the alcohol content, the target operating parameters of the vehicle engine are determined. The target operating parameters include at least the target injection pulse width and the target ignition advance angle. Adjust the vehicle engine's operating parameters at the current moment based on the target operating parameters.

[0008] In some embodiments of this application, determining the alcohol content in a flexible alcohol fuel in a vehicle engine based on knock intensity includes: Based on the detonation intensity, the target octane number corresponding to the detonation intensity is determined from the detonation intensity-octane number mapping relationship. The detonation intensity-octane number mapping relationship includes multiple detonation intensities, and each detonation intensity corresponds to an octane number. Based on the target octane number, the alcohol content corresponding to the octane number is determined from the octane number-alcohol content mapping relationship. The octane number-alcohol content mapping relationship includes multiple octane numbers, with each octane number corresponding to one alcohol content.

[0009] In some embodiments of this application, controlling the target fuel injection pulse width of a vehicle engine includes: Determine the base fuel injection compensation coefficient based on alcohol content; The target injection pulse width is determined based on the base injection compensation coefficient and the base injection quantity.

[0010] In some embodiments of this application, the target injection pulse width is determined based on the base injection compensation coefficient and the base injection quantity, including: The first injection pulse width is determined based on the basic injection compensation coefficient and the basic injection quantity; Obtain the current battery voltage and coolant temperature; Determine the voltage compensation coefficient corresponding to the battery voltage and the temperature compensation coefficient corresponding to the coolant temperature; The target injection pulse width is determined based on the voltage compensation coefficient, temperature compensation coefficient, and the first injection pulse width.

[0011] In some embodiments of this application, the target injection pulse width is determined based on the voltage compensation coefficient, the temperature compensation coefficient, and the first injection pulse width, including: The second injection pulse width is determined based on the voltage compensation coefficient, temperature compensation coefficient, and the first injection pulse width. The theoretical air-fuel ratio is determined based on the alcohol content; Obtain the current actual air-fuel ratio of the vehicle's engine; Calculate the difference between the theoretical air-fuel ratio and the actual air-fuel ratio; Based on the difference, the second injection pulse width is adjusted to obtain the target injection pulse width.

[0012] In some embodiments of this application, controlling the target ignition advance angle of the vehicle engine includes: Based on the alcohol content, the target ignition advance angle corresponding to the alcohol content is determined from the mapping relationship between alcohol content and ignition advance angle. The mapping relationship between alcohol content and ignition advance angle includes multiple alcohol contents, and each alcohol content corresponds to an ignition advance angle.

[0013] In some embodiments of this application, the target ignition advance angle corresponding to the alcohol content is determined from the alcohol content-ignition advance angle mapping relationship based on the alcohol content, including: Based on the alcohol content, the first ignition advance angle corresponding to the alcohol content is determined from the mapping relationship between alcohol content and ignition advance angle. Obtain the vehicle engine's current throttle change rate, coolant temperature, and altitude; Determine the water temperature compensation amount corresponding to the coolant temperature, the altitude compensation amount corresponding to the altitude, and the transient load compensation amount corresponding to the throttle change rate. The target ignition advance angle is determined based on water temperature compensation, altitude compensation, transient load compensation, and the first ignition advance angle.

[0014] In some embodiments of this application, the target ignition advance angle is determined based on water temperature compensation, altitude compensation, transient load compensation, and the first ignition advance angle, including: The second ignition advance angle is determined based on the water temperature compensation, altitude compensation, transient load compensation, and the first ignition advance angle. Based on the detonation intensity, the detonation state is determined, which includes: no detonation, critical detonation, and slight detonation. The target ignition advance angle is determined based on the knock state and the second ignition advance angle.

[0015] According to a second aspect of the present application, a control device for alcohol-based flexible fuels in a vehicle engine is provided, the device comprising: The acquisition unit is used to acquire the knock intensity of the vehicle engine at the current moment; A determination unit is used to determine the alcohol content in a vehicle engine's alcohol-based flexible fuel based on knock intensity; The determination unit is used to determine the target operating parameters of the vehicle engine based on the alcohol content. The target operating parameters include at least the target injection pulse width and the target ignition advance angle. The adjustment unit is used to adjust the current operating parameters of the vehicle engine based on the target operating parameters.

[0016] According to a third aspect of the embodiments of this application, a computer-readable storage medium is provided storing computer program instructions, which, when loaded and executed by a processor, implement the steps of the vehicle engine alcohol flexible fuel control method as described in any of the first aspects.

[0017] According to a fourth aspect of the embodiments of this application, an electronic device is provided, including a processor and a memory, the memory storing computer program instructions executable by the processor, wherein when the processor executes the computer program instructions, it implements the steps of the vehicle engine alcohol flexible fuel control method as described in any of the first aspects.

[0018] According to a fifth aspect of the embodiments of this application, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps of a vehicle engine alcohol flexible fuel control method as described in any of the first aspects.

[0019] This application obtains the current knock intensity of a vehicle engine; based on the knock intensity, it determines the alcohol content in a flexible fuel mixture within the vehicle engine; and based on the alcohol content, it controls target operating parameters of the vehicle engine, including at least a target injection pulse width and a target ignition advance angle. This application can determine the alcohol content in the fuel by obtaining the knock intensity of the vehicle engine, eliminating the need for an additional fuel composition sensor, significantly reducing costs, and improving the accuracy of alcohol content identification.

[0020] Furthermore, by utilizing different alcohol contents, the operating parameters of the vehicle engine can be configured, resulting in better ignition advance angle and injection pulse width. This allows the vehicle engine to be adapted to various proportions of the matching scheme, achieving precise control of the engine. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings: Figure 1 A flowchart illustrating a method for controlling alcohol-based flexible fuels in a vehicle engine, as described in an embodiment of this application, is shown. Figure 2 A schematic diagram of the process for determining the alcohol content in a flexible alcohol fuel in a vehicle engine, as illustrated in an embodiment of this application, is shown. Figure 3 A flowchart illustrating a method for controlling the target injection pulse width of a vehicle engine, as shown in an embodiment of this application, is presented. Figure 4 A schematic diagram of a process for determining a target fuel injection pulse width is shown in an embodiment of this application; Figure 5 A schematic diagram of another process for determining the target injection pulse width is shown in an embodiment of this application; Figure 6 A flowchart illustrating a control method for determining the target ignition advance angle corresponding to the alcohol content in an embodiment of this application is shown. Figure 7A flowchart illustrating a control method for determining a target ignition advance angle according to an embodiment of this application is shown; Figure 8 A schematic diagram of a control device for a vehicle engine alcohol flexible fuel according to an embodiment of this application is shown; Figure 9 A schematic diagram of the structure of an electronic device in an embodiment of this application is shown. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0024] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0025] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0026] In one exemplary embodiment, reference may be made to Figure 1 The flowchart of a method for controlling alcohol-based flexible fuels in a vehicle engine according to an embodiment of this application is shown, and the following steps S101-S104 are described in detail: S101, obtain the knock intensity of the vehicle engine at the current moment.

[0027] S102, based on knock intensity, determines the alcohol content in flexible alcohol fuels in vehicle engines.

[0028] S103, based on alcohol content, determines the target operating parameters of the vehicle engine.

[0029] S104, adjust the current operating parameters of the vehicle engine based on the target operating parameters.

[0030] In this application, the knock intensity of a vehicle engine can be obtained, and the alcohol content in the fuel can be determined based on the knock intensity, eliminating the need for an additional fuel composition sensor, significantly reducing costs, and improving the accuracy of alcohol content identification. Furthermore, different alcohol contents can be used to configure the operating parameters of the vehicle engine, providing better ignition advance angle and injection pulse width, allowing the vehicle engine to adapt to various proportional control schemes and achieve precise engine control.

[0031] In some embodiments, the target operating parameters include at least the target injection pulse width and the target ignition advance angle.

[0032] In some embodiments, regarding the knock intensity in step S101 above, in actual vehicles, the knock intensity of the vehicle engine at the current moment can be directly obtained through a knock sensor.

[0033] Specifically, in actual vehicle engines, piezoelectric knock sensors can be used, with a measurement range of 0-20kHz and a sensitivity ≥10mV / g. The transmission line uses twisted-pair shielded cable (shield grounding resistance ≤1Ω). A TVS diode (response speed ≤1ns) and an RC filter circuit (cutoff frequency 1kHz) are added to the ECU signal port to suppress electromagnetic interference and voltage spikes. The specific model can be selected according to the actual situation and will not be elaborated here.

[0034] In this application, "alcohol-based flexible fuel" refers to a blend of alcohol and fuel oil. The alcohol can be ethanol or other alcohols, and no specific limitation is made here.

[0035] To better understand this solution, the following examples use ethanol as an example to illustrate the concept in detail.

[0036] In this application, the vehicle engine can use a mixture of ethanol and fuel in actual operation. In traditional technical solutions, the ethanol content covers E0-E100. However, in traditional control solutions, when the vehicle engine is working, a fixed adaptation scheme is mainly adopted, that is, any scheme in E0-E100 is fixed. In contrast, this application can complete various adaptations of the engine according to the actual ethanol content in the engine.

[0037] In some embodiments, the ethanol content in fuel can vary due to various influencing factors affecting the vehicle engine, necessitating control of the vehicle engine fuel based on ethanol content. Traditionally, ethanol content is identified using an ethanol concentration sensor. However, to improve the accuracy and efficiency of ethanol content identification, this application utilizes existing knock intensity technology to identify ethanol content. For details, please refer to... Figure 2 As shown, the alcohol content in the flexible alcohol fuel in the vehicle engine is determined based on the knock intensity, including steps S201-S202: S201, based on the detonation intensity, determines the target octane number corresponding to the detonation intensity from the detonation intensity-octane number mapping relationship.

[0038] The detonation intensity-octane number mapping relationship includes multiple detonation intensities, each corresponding to a specific octane number. Specifically, the detonation intensity-octane number mapping relationship can be in tabular or array form; the specific format can be set according to the actual situation, and will not be elaborated further here.

[0039] In some embodiments, during actual vehicle operation, the octane rating is negatively correlated with engine knock intensity; that is, the higher the octane rating, the lower the knock intensity at the same ignition advance angle. Therefore, by determining the relationship between octane rating and knock intensity, the octane rating can be deduced from the knock intensity. The specific determination process is as follows: Through experimental calibration, the octane rating of the vehicle was measured under different operating conditions and knock intensities. This established a mapping relationship between knock intensity and octane rating, clarifying the relationship between knock intensity and octane rating, so that the octane rating can be directly determined based on the obtained knock intensity.

[0040] In order to obtain a more accurate mapping relationship between detonation intensity and octane number, 500,000 sets of working condition samples can be used to complete the test, which greatly improves the accuracy of octane number identification.

[0041] S202, based on the target octane number, determines the alcohol content corresponding to the octane number from the octane number-alcohol content mapping relationship.

[0042] The octane number-alcohol content mapping relationship includes multiple octane numbers, with each octane number corresponding to a specific alcohol content. Specifically, the octane number-alcohol content mapping relationship can be in tabular or array form; the specific format can be set according to the actual situation, and will not be elaborated further here.

[0043] In some embodiments, during actual vehicle operation, there is a linear positive correlation between ethanol content and octane rating (for every 20% increase in ethanol content, the octane rating increases by 3-4 units). Therefore, once a clear relationship between ethanol content and octane rating is found, the ethanol content can be deduced from the octane rating. The specific determination process is as follows: Through experimental calibration, the ethanol content of the vehicle under different operating conditions and at different octane numbers was detected, thereby establishing a mapping relationship between octane number and alcohol content, clarifying the relationship between octane number and ethanol content, and enabling the ethanol content to be directly determined based on the obtained octane number.

[0044] In this way, the ethanol content can be quickly determined based on the octane number, greatly accelerating the efficiency of ethanol content identification.

[0045] In some embodiments, the process for determining the target injection pulse width in step S103 above can be referred to Figure 3 As shown, controlling the target fuel injection pulse width of the vehicle engine includes steps S301-S302: S301, based on alcohol content, determines the basic fuel injection compensation coefficient.

[0046] In some embodiments, conventional vehicle engines have calibration coefficients for six gears: E0, E20, E40, E60, E80, and E100. In conventional technologies, the calibration coefficient of one of the six gears is used and then not modified. However, this application determines the calibration coefficient from the six gears in real time based on the alcohol content, thereby achieving engine control.

[0047] Specifically, the calibration coefficient of the gear corresponding to the alcohol content that is the same as the determined alcohol content is used as the basic fuel injection compensation coefficient.

[0048] In other embodiments, because the alcohol content of the vehicle engine changes continuously during actual operation, its value is not the same as the content corresponding to the six gears. When the determined alcohol content is between two gears, the specific processing procedure is as follows: if the alcohol content is not among the contents corresponding to the six gears, then linear interpolation is performed on the two adjacent gears to obtain the basic fuel injection compensation coefficient.

[0049] Specifically, taking an ethanol content of 2 as an example, it is between content 1 and 3. Content 1 corresponds to gear 1, and content 3 corresponds to gear 2. The calibration coefficient corresponding to gear 1 is 2, and the calibration coefficient corresponding to gear 2 is 6. Therefore, linear interpolation is performed between (1, 2) and (3, 6), and the basic fuel injection compensation coefficient is finally calculated to be 4.

[0050] S302 determines the target injection pulse width based on the base injection compensation coefficient and the base injection quantity.

[0051] The base fuel injection quantity refers to the original base fuel injection quantity of gasoline.

[0052] In this embodiment, the product of the base injection compensation coefficient and the base injection quantity is used as the target injection pulse width.

[0053] Specifically, taking a base injection compensation coefficient of 2 and a base injection quantity of 3 as an example, the target injection pulse width is 6.

[0054] In some embodiments, various factors can affect the fuel injection quantity during the actual operation of a vehicle engine. In particular, battery voltage can cause injector delay, thus affecting the fuel injection quantity and pulse width. Even extremely low temperatures can affect the fuel injection quantity. Therefore, to eliminate these effects, compensation for the fuel injection pulse width must be implemented based on battery voltage and coolant temperature. For details, please refer to... Figure 4 As shown, the target injection pulse width is determined based on the base injection compensation coefficient and the base injection quantity, including steps S401-S404: S401, based on the basic injection compensation coefficient and the basic injection quantity, determine the first injection pulse width.

[0055] In this embodiment, the first injection pulse width is the product of the basic injection compensation coefficient and the basic injection quantity.

[0056] S402, obtain the current battery voltage and coolant temperature.

[0057] S403, determine the voltage compensation coefficient corresponding to the battery voltage and the temperature compensation coefficient corresponding to the coolant temperature.

[0058] In this embodiment, the voltage compensation coefficient corresponding to the battery voltage is determined from the voltage-compensation coefficient mapping relationship. The voltage-compensation coefficient mapping relationship stores multiple voltages, each corresponding to a voltage compensation coefficient.

[0059] The voltage-compensation coefficient mapping relationship described above can be presented as a table or an array. The specific representation can be set according to the actual situation, and will not be elaborated here.

[0060] In this embodiment, the water temperature compensation coefficient corresponding to the coolant temperature is determined from the water temperature-compensation coefficient mapping relationship. The water temperature-compensation coefficient mapping relationship stores multiple water temperatures, each corresponding to a water temperature compensation coefficient.

[0061] The above mapping relationship between electric water temperature and compensation coefficient can be presented as a table or an array. The specific form of the mapping can be set according to the actual situation, and will not be elaborated here.

[0062] The above-mentioned water temperature-compensation coefficient mapping relationship and voltage-compensation coefficient mapping relationship can be calibrated through experiments. The specific calibration process can be set according to the actual situation, and will not be elaborated here.

[0063] S404 determines the target injection pulse width based on the voltage compensation coefficient, temperature compensation coefficient, and the first injection pulse width.

[0064] In some embodiments, the specific process of determining the target injection pulse width includes: calculating the product of the temperature compensation coefficient and the first injection pulse width, and using the sum of the product and the voltage compensation coefficient as the target injection pulse width.

[0065] In this embodiment, the fuel injection pulse width is adjusted by using temperature compensation coefficient and voltage compensation coefficient, eliminating the influence of battery voltage and coolant temperature on the fuel injection pulse width and greatly improving control accuracy.

[0066] In some embodiments, reference may be made to Figure 5 As shown, the target injection pulse width is determined based on the voltage compensation coefficient, temperature compensation coefficient, and the first injection pulse width, including steps S501-S505: S501, based on the voltage compensation coefficient, temperature compensation coefficient and the first injection pulse width, determines the second injection pulse width.

[0067] In this embodiment, the product of the temperature compensation coefficient and the first injection pulse width is calculated, and the sum of the product and the voltage compensation coefficient is used as the second injection pulse width.

[0068] In some other embodiments, the first injection pulse width in step S501 can be the first injection pulse width determined in step SS01.

[0069] S502, based on alcohol content, determines the theoretical air-fuel ratio.

[0070] In this embodiment, the air-fuel ratio corresponding to the prime number of alcohols is obtained from the alcohol content-air-fuel ratio mapping relationship, and this air-fuel ratio is used as the theoretical air-fuel ratio. The alcohol content-air-fuel ratio mapping relationship includes multiple alcohol contents, with each alcohol content corresponding to a specific air-fuel ratio.

[0071] Specifically, the mapping relationship between alcohol content and air-fuel ratio can be in the form of a table or an array. The specific form of the representation can be set according to the actual situation, and will not be elaborated here.

[0072] In some embodiments, the mapping relationship between alcohol content and air-fuel ratio can be calibrated experimentally, and the specific calibration process will not be described in detail here.

[0073] S503 is the actual air-fuel ratio of the vehicle's engine at the current moment.

[0074] In this embodiment, the actual air-fuel ratio of the vehicle engine at the current moment can be obtained through an oxygen sensor.

[0075] S504 calculates the difference between the theoretical air-fuel ratio and the actual air-fuel ratio.

[0076] S505, based on the difference, adjust the second injection pulse width to obtain the target injection pulse width.

[0077] In this embodiment, if the actual air-fuel ratio is less than the theoretical air-fuel ratio, the second injection pulse width needs to be lowered; if the actual air-fuel ratio is greater than the theoretical air-fuel ratio, the second injection pulse width needs to be raised.

[0078] Specifically, the calculation process is as follows: the difference is processed by the PI controller (Proportional-Integral Controller) to obtain the correction parameter, and the product of the correction parameter and the second injection pulse width is used as the target injection pulse width.

[0079] In some embodiments, the variation range is ≤3% during each adjustment of the fuel injection pulse width.

[0080] In some embodiments, the process of determining the target ignition advance angle in step S103 above specifically controls the target ignition advance angle of the vehicle engine, including: determining the target ignition advance angle corresponding to the alcohol content from the alcohol content-ignition advance angle mapping relationship based on the alcohol content.

[0081] The mapping relationship between alcohol content and ignition advance angle includes multiple alcohol contents, with each alcohol content corresponding to an ignition advance angle.

[0082] Specifically, the mapping relationship between alcohol content and ignition advance angle can be a table or an array, which can be set according to the actual situation, and will not be elaborated here.

[0083] In the actual alcohol content-ignition advance angle mapping relationship, there are only six different ignition advance angles. That is, there are only two alcohol contents and their corresponding ignition advance angles in the alcohol content-ignition advance angle mapping relationship. If the currently obtained alcohol content is different from the alcohol contents of all six different positions, the target ignition advance angle is determined from the two closest positions through linear interpolation, as follows: If the alcohol content obtained at the current moment is 4, and the alcohol content of the two gears in the vector is 2 and 6, the corresponding ignition advance angles are 6 and 18 respectively. Therefore, the ignition advance angle corresponding to the alcohol content of 4 is found to be 12 by linear interpolation.

[0084] In some embodiments, during the actual operation of a vehicle engine, it may be affected by various factors, such as altitude and coolant temperature, which can all influence the ignition advance angle. Therefore, to eliminate the influence of these factors, further processing of the relevant ignition advance angle is required. (See reference...) Figure 6 As shown, based on the alcohol content, the target ignition advance angle corresponding to the alcohol content is determined from the mapping relationship between alcohol content and ignition advance angle, including steps S601-S604: S601, based on the alcohol content, determines the first ignition advance angle corresponding to the alcohol content from the mapping relationship between alcohol content and ignition advance angle.

[0085] In this embodiment, the ignition advance angle corresponding to the alcohol content is determined from the mapping relationship between alcohol content and ignition advance angle, which can be based on the above embodiment and will not be repeated here.

[0086] S602 obtains the current throttle change rate, coolant temperature, and altitude.

[0087] S603, determine the water temperature compensation amount corresponding to the coolant temperature, the altitude compensation amount corresponding to the altitude, and the transient load compensation amount corresponding to the throttle change rate.

[0088] The aforementioned water temperature compensation amount is determined from the coolant temperature-water temperature compensation amount mapping relationship. This mapping relationship includes multiple coolant temperatures, each corresponding to a water temperature compensation amount. Specifically, the corresponding water temperature compensation amount is obtained directly from the coolant temperature-water temperature compensation amount mapping relationship based on the acquired coolant temperature.

[0089] The aforementioned altitude compensation amount is determined from the altitude-altitude compensation amount mapping relationship, which includes multiple altitudes, each corresponding to an altitude compensation amount. Specifically, the corresponding altitude compensation amount is obtained directly from the altitude-altitude compensation amount mapping relationship based on the acquired altitude.

[0090] The aforementioned transient load compensation amount is determined from the throttle change rate-transient load compensation amount mapping relationship. This mapping relationship includes multiple throttle change rates, each corresponding to a transient load compensation amount. Specifically, the corresponding transient load compensation amount is obtained directly from the throttle change rate-transient load compensation amount mapping relationship based on the acquired throttle change rate.

[0091] In some embodiments, the mapping relationships of coolant temperature-water temperature compensation, throttle change rate-transient load compensation, and altitude-altitude compensation can be in tabular or array form, or in other forms. The specific settings can be determined according to the actual situation, and will not be elaborated here.

[0092] S604 determines the target ignition advance angle based on water temperature compensation, altitude compensation, transient load compensation, and the first ignition advance angle.

[0093] In this embodiment, the sum of water temperature compensation, altitude compensation, transient load compensation, and the first ignition advance angle is used as the target ignition advance angle.

[0094] In this embodiment of the disclosure, by eliminating the influence of altitude and coolant temperature, the accuracy of the determined ignition advance angle can be greatly improved, which also indirectly improves the combustion efficiency of the vehicle engine.

[0095] In some embodiments, the intensity of knocking during actual vehicle engine operation can also affect the ignition advance angle. Therefore, to eliminate the influence of different knocking intensities, further processing of the ignition advance angle is required. (Refer to...) Figure 7 As shown, the target ignition advance angle is determined based on the water temperature compensation, altitude compensation, transient load compensation, and the first ignition advance angle, including steps S701-S703: S701 determines the second ignition advance angle based on water temperature compensation, altitude compensation, transient load compensation, and the first ignition advance angle.

[0096] In this embodiment of the disclosure, the process of determining the ignition advance angle based on the water temperature compensation amount, altitude compensation amount, transient load compensation amount and the first ignition advance angle described in the above embodiments can be referred to, and will not be repeated here.

[0097] In this embodiment, the first ignition advance angle can be the first ignition advance angle determined in step S701 above.

[0098] S702, based on the detonation intensity, determines the detonation state.

[0099] In some embodiments, the knocking state includes: no knocking, critical knocking, and slight knocking.

[0100] Specifically, if the detonation intensity is less than the first safety threshold, the detonation state is determined to be no detonation; if the detonation intensity is greater than the second safety threshold, the detonation state is determined to be slight detonation; if the detonation intensity is not less than the first safety threshold and not greater than the second safety threshold, the detonation state is determined to be critical detonation.

[0101] S703 determines the target ignition advance angle based on the knock state and the second ignition advance angle.

[0102] In this embodiment, if the detonation state is non-detonation, the second ignition advance angle is advanced by the first preset threshold to obtain the target ignition advance angle; If the detonation state is critical detonation, then the second ignition advance angle is taken as the target ignition advance angle.

[0103] If the knocking condition is slight knocking, the second ignition advance angle is delayed by the second preset threshold to obtain the target ignition advance angle.

[0104] In some embodiments, the fluctuation range of each adjustment of the ignition advance angle meets a preset condition. This preset condition can be greater than or equal to -2 and less than or equal to 5. This preset condition can be modified according to actual conditions, and will not be elaborated further here.

[0105] In some embodiments, for step S104, after obtaining the target operating parameters through steps S101-S103, the engine is controlled to execute the operating parameters.

[0106] This application obtains the current knock intensity of a vehicle engine; based on the knock intensity, it determines the alcohol content in a flexible fuel mixture within the vehicle engine; and based on the alcohol content, it controls target operating parameters of the vehicle engine, including at least a target injection pulse width and a target ignition advance angle. This application can determine the alcohol content in the fuel by obtaining the knock intensity of the vehicle engine, eliminating the need for an additional fuel composition sensor, significantly reducing costs, and improving the accuracy of alcohol content identification.

[0107] Furthermore, by utilizing different alcohol contents, the fuel operation parameters of the vehicle engine can be configured, resulting in better ignition advance angle and injection pulse width. This allows the vehicle engine to adapt to various ratio adaptation schemes, achieving precise control of the engine.

[0108] The following describes an embodiment of the apparatus described in this application, which can be used to execute the vehicle engine alcohol flexible fuel control method described in the above embodiments of this application. For details not disclosed in the apparatus embodiments of this application, please refer to the embodiments of the vehicle engine alcohol flexible fuel control method described above in this application.

[0109] See Figure 8 This application shows a schematic diagram of a control device for a vehicle engine's flexible alcohol fuel according to an embodiment of the present application, specifically including: The acquisition unit 801 is used to acquire the knock intensity of the vehicle engine at the current moment; Determining unit 802 is used to determine the alcohol content in the alcohol flexible fuel in the vehicle engine based on the knock intensity; The determining unit 802 is used to determine the target operating parameters of the vehicle engine based on the alcohol content. The target operating parameters include at least the target injection pulse width and the target ignition advance angle. The adjustment unit 803 is used to adjust the current operating parameters of the vehicle engine based on the target operating parameters.

[0110] In an exemplary embodiment, based on the above embodiments, the vehicle engine alcohol flexible fuel control device 800 is used to determine the alcohol content in the vehicle engine alcohol flexible fuel based on knock intensity, specifically including: Based on the detonation intensity, the target octane number corresponding to the detonation intensity is determined from the detonation intensity-octane number mapping relationship. The detonation intensity-octane number mapping relationship includes multiple detonation intensities, and each detonation intensity corresponds to an octane number. Based on the target octane number, the alcohol content corresponding to the octane number is determined from the octane number-alcohol content mapping relationship. The octane number-alcohol content mapping relationship includes multiple octane numbers, with each octane number corresponding to one alcohol content.

[0111] In an exemplary embodiment, based on the above embodiments, the vehicle engine alcohol flexible fuel control device 800 is used to control the target injection pulse width of the vehicle engine, specifically for: Determine the base fuel injection compensation coefficient based on alcohol content; The target injection pulse width is determined based on the base injection compensation coefficient and the base injection quantity.

[0112] In an exemplary embodiment, based on the above embodiments, the vehicle engine alcohol flexible fuel control device 800 is used to determine the target injection pulse width based on the basic injection compensation coefficient and the basic injection quantity, specifically for: The first injection pulse width is determined based on the basic injection compensation coefficient and the basic injection quantity; Obtain the current battery voltage and coolant temperature; Determine the voltage compensation coefficient corresponding to the battery voltage and the temperature compensation coefficient corresponding to the coolant temperature; The target injection pulse width is determined based on the voltage compensation coefficient, temperature compensation coefficient, and the first injection pulse width.

[0113] In an exemplary embodiment, based on the above embodiments, the vehicle engine alcohol flexible fuel control device 800 is used to determine a target injection pulse width based on a voltage compensation coefficient, a temperature compensation coefficient, and a first injection pulse width, specifically for: The second injection pulse width is determined based on the voltage compensation coefficient, temperature compensation coefficient, and the first injection pulse width. The theoretical air-fuel ratio is determined based on the alcohol content; Obtain the current actual air-fuel ratio of the vehicle's engine; Calculate the difference between the theoretical air-fuel ratio and the actual air-fuel ratio; Based on the difference, the second injection pulse width is adjusted to obtain the target injection pulse width.

[0114] In an exemplary embodiment, based on the above embodiments, the vehicle engine alcohol flexible fuel control device 800 is used to control the target ignition advance angle of the vehicle engine, specifically for: Based on the alcohol content, the target ignition advance angle corresponding to the alcohol content is determined from the mapping relationship between alcohol content and ignition advance angle. The mapping relationship between alcohol content and ignition advance angle includes multiple alcohol contents, and each alcohol content corresponds to an ignition advance angle.

[0115] In an exemplary embodiment, based on the above embodiments, the vehicle engine alcohol flexible fuel control device 800 is used to determine the target ignition advance angle corresponding to the alcohol content from the alcohol content-ignition advance angle mapping relationship based on the alcohol content, specifically for: Based on the alcohol content, the first ignition advance angle corresponding to the alcohol content is determined from the mapping relationship between alcohol content and ignition advance angle. Obtain the vehicle engine's current throttle change rate, coolant temperature, and altitude; Determine the water temperature compensation amount corresponding to the coolant temperature, the altitude compensation amount corresponding to the altitude, and the transient load compensation amount corresponding to the throttle change rate. The target ignition advance angle is determined based on water temperature compensation, altitude compensation, transient load compensation, and the first ignition advance angle.

[0116] In an exemplary embodiment, based on the above embodiments, the vehicle engine alcohol flexible fuel control device 800 is used to determine a target ignition advance angle based on water temperature compensation, altitude compensation, transient load compensation, and a first ignition advance angle, specifically for: The second ignition advance angle is determined based on the water temperature compensation, altitude compensation, transient load compensation, and the first ignition advance angle. Based on the detonation intensity, the detonation state is determined, which includes: no detonation, critical detonation, and slight detonation. The target ignition advance angle is determined based on the knock state and the second ignition advance angle.

[0117] This application obtains the current knock intensity of a vehicle engine; based on the knock intensity, it determines the alcohol content in a flexible fuel mixture within the vehicle engine; and based on the alcohol content, it controls target operating parameters of the vehicle engine, including at least a target injection pulse width and a target ignition advance angle. This application can determine the alcohol content in the fuel by obtaining the knock intensity of the vehicle engine, eliminating the need for an additional fuel composition sensor, significantly reducing costs, and improving the accuracy of alcohol content identification.

[0118] Furthermore, by utilizing different alcohol contents, the fuel operation parameters of the vehicle engine can be configured, resulting in better ignition advance angle and injection pulse width. This allows the vehicle engine to adapt to various ratio adaptation schemes, achieving precise control of the engine.

[0119] The apparatus in this application embodiment can execute the method provided in this application embodiment. The implementation principle is similar. The actions performed by each module in the apparatus of each embodiment of this application correspond to the steps in the method of each embodiment of this application. For detailed functional descriptions of each module of the apparatus, please refer to the descriptions in the corresponding methods shown above, which will not be repeated here.

[0120] Based on the same inventive concept, embodiments of this application provide a computer-readable storage medium storing computer program instructions. When the computer program instructions are loaded and executed by a processor, they implement the steps of the above-described vehicle engine alcohol flexible fuel control method.

[0121] Based on the same inventive concept, this application provides an electronic device, see [link to relevant documentation]. Figure 9 The diagram shows a schematic of the structure of an electronic device in an embodiment of this application. The electronic device includes one or more memories 904, one or more processors 902, and at least one computer program stored in the memory 904 and executable on the processor 902. When the processor 902 executes the computer program, it implements the steps of the control method for flexible alcohol fuel in a vehicle engine as described above.

[0122] The bus architecture (represented by bus 900) includes any number of interconnected buses and bridges, linking various circuits including one or more processors represented by processor 902 and memory represented by memory 904. Bus 900 can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. Bus interface 905 provides an interface between bus 900 and receiver 901 and transmitter 903. Receiver 901 and transmitter 903 can be the same element, a transceiver, providing a unit for communicating with various other devices over a transmission medium. Processor 902 is responsible for managing bus 900 and general processing, while memory 904 can be used to store data used by processor 902 during operation.

[0123] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored as one or more instructions or codes on or transmitted via a computer-readable medium. Other examples and embodiments are within the scope and spirit of this application and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hardwired, or any combination thereof. Furthermore, the functional units may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit.

[0124] Based on the same inventive concept, embodiments of this application provide a computer program product, including a computer program that, when executed by a processor, implements the steps of the above-described method for controlling alcohol-based flexible fuels in vehicle engines.

[0125] Based on the same inventive concept, this application provides a vehicle including an on-board controller. The on-board controller stores computer program instructions, which, when loaded and executed by a processor, implement the steps of the vehicle engine alcohol flexible fuel control method described above.

[0126] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0127] The units described as separate components may or may not be physically separate. Similarly, the components of the control device may or may not be physical units; they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment, depending on actual needs.

[0128] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing computer program instructions, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0129] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A method for controlling alcohol-based flexible fuels in a vehicle engine, characterized in that the method comprises: Obtain the current knock intensity of the vehicle engine; Based on the aforementioned knock intensity, the alcohol content in the alcohol-based flexible fuel in the vehicle engine is determined; Based on the alcohol content, the target operating parameters of the vehicle engine are determined, and the target operating parameters include at least the target injection pulse width and the target ignition advance angle; The vehicle engine's operating parameters are adjusted based on the target operating parameters at the current moment.

2. The method according to claim 1, characterized in that, The determination of the alcohol content in the flexible alcohol fuel in the vehicle engine based on the knock intensity includes: Based on the detonation intensity, the target octane number corresponding to the detonation intensity is determined from the detonation intensity-octane number mapping relationship. The detonation intensity-octane number mapping relationship includes multiple detonation intensities, and each detonation intensity corresponds to an octane number. Based on the target octane number, the alcohol content corresponding to the octane number is determined from the octane number-alcohol content mapping relationship. The octane number-alcohol content mapping relationship includes multiple octane numbers, with each octane number corresponding to one alcohol content.

3. The method according to claim 1, characterized in that, Controlling the target injection pulse width of the vehicle engine includes: Based on the alcohol content, the base fuel injection compensation coefficient is determined; The target injection pulse width is determined based on the basic injection compensation coefficient and the basic injection quantity.

4. The method according to claim 3, characterized in that, Determining the target injection pulse width based on the base injection compensation coefficient and the base injection quantity includes: The first injection pulse width is determined based on the basic injection compensation coefficient and the basic injection quantity. Obtain the current battery voltage and coolant temperature; Determine the voltage compensation coefficient corresponding to the battery voltage and the temperature compensation coefficient corresponding to the coolant temperature; The target injection pulse width is determined based on the voltage compensation coefficient, the temperature compensation coefficient, and the first injection pulse width.

5. The method according to claim 4, characterized in that, Determining the target injection pulse width based on the voltage compensation coefficient, the temperature compensation coefficient, and the first injection pulse width includes: The second injection pulse width is determined based on the voltage compensation coefficient, the temperature compensation coefficient, and the first injection pulse width. The theoretical air-fuel ratio is determined based on the alcohol content. Obtain the actual air-fuel ratio of the vehicle engine at the current moment; Calculate the difference between the theoretical air-fuel ratio and the actual air-fuel ratio; Based on the difference, the second injection pulse width is adjusted to obtain the target injection pulse width.

6. The method according to claim 1, characterized in that, Controlling the target ignition advance angle of the vehicle engine includes: Based on the alcohol content, the target ignition advance angle corresponding to the alcohol content is determined from the alcohol content-ignition advance angle mapping relationship. The alcohol content-ignition advance angle mapping relationship includes multiple alcohol contents, and each alcohol content corresponds to an ignition advance angle.

7. The method according to claim 6, characterized in that, The step of determining the target ignition advance angle corresponding to the alcohol content from the alcohol content-ignition advance angle mapping relationship based on the alcohol content includes: Based on the alcohol content, the first ignition advance angle corresponding to the alcohol content is determined from the mapping relationship between alcohol content and ignition advance angle. Obtain the throttle change rate, coolant temperature, and altitude of the vehicle engine at the current moment; Determine the water temperature compensation amount corresponding to the coolant temperature, the altitude compensation amount corresponding to the altitude, and the transient load compensation amount corresponding to the throttle change rate; The target ignition advance angle is determined based on the water temperature compensation, the altitude compensation, the transient load compensation, and the first ignition advance angle.

8. The method according to claim 7, characterized in that, The step of determining the target ignition advance angle based on the water temperature compensation, the altitude compensation, the transient load compensation, and the first ignition advance angle includes: The second ignition advance angle is determined based on the water temperature compensation, the altitude compensation, the transient load compensation, and the first ignition advance angle. Based on the detonation intensity, the detonation state is determined, including: no detonation, critical detonation, and slight detonation; The target ignition advance angle is determined based on the knock state and the second ignition advance angle.

9. A control device for alcohol-based flexible fuels in a vehicle engine, characterized in that the device comprises: The acquisition unit is used to acquire the knock intensity of the vehicle engine at the current moment; A determining unit is used to determine the alcohol content in a flexible alcohol fuel in a vehicle engine based on the knock intensity. The determining unit is used to determine the target operating parameters of the vehicle engine based on the alcohol content, wherein the target operating parameters include at least the target injection pulse width and the target ignition advance angle; An adjustment unit is used to adjust the operating parameters of the vehicle engine at the current moment based on the target operating parameters.

10. An electronic device comprising a processor and a memory, characterized in that, The memory stores computer program instructions that can be executed by the processor, and when the processor executes the computer program instructions, it performs the operation as described in any one of claims 1 to 8.

11. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer program instructions that, when loaded and executed by a processor, implement the operations performed by the method as described in any one of claims 1 to 8.

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