A method and device for determining the ignition angle of alcohol fuel

Abstract

The present application provides a method and device for determining the ignition angle of alcohol fuel. The method comprises: obtaining an air-fuel ratio self-learning value and a jitter value collected by a knock sensor of an engine; obtaining an ideal compensation value of the ignition angle based on the air-fuel ratio self-learning value, and obtaining a knock tendency coefficient based on the jitter value; and obtaining a target compensation value of the ignition angle based on the ideal compensation value of the ignition angle and the knock tendency coefficient. The target compensation value of the ignition angle is obtained by obtaining the air-fuel ratio self-learning value and the jitter value collected by the knock sensor of the engine, thereby realizing automatic adjustment of the ignition angle to the vicinity of the optimal ignition angle, i.e., the ignition angle at the knock boundary, under different proportions of alcohol fuel. The optimal power output and the optimal in-cylinder combustion can be achieved under different proportions of alcohol fuel, and calibration tests of different proportions of alcohol fuel on a test bench are not required.

Description

Technical Field

[0001] The present application relates to the field of engine technology, and in particular to a method, device, medium and electronic equipment for determining an ignition angle of an alcohol fuel. Background Art

[0002] Alcohol fuels are being vigorously promoted in countries such as Brazil and India, and the required alcohol fuel ratio range is different. For cars exported to the above countries, corresponding engines need to be configured. Since the anti-knock properties of different alcohol fuels are different (for example, the higher the ethanol content, the better the anti-knock properties), the ignition angle control part in the engine control software needs to adjust the ignition angle according to the ethanol content.

[0003] At present, for engines without alcohol fuel content sensors in the oil pipeline, since the system cannot quickly identify the alcohol fuel content in the fuel, the ignition angle calibration strategy uses gasoline with the lowest alcohol fuel content on the market (such as Brazilian E22 ethanol gasoline and Indian E15 ethanol gasoline) to test and obtain the ignition angle knock critical point under various working conditions, that is, the maximum limit of the ignition angle. In actual use scenarios, even if the user uses high-grade alcohol fuel (such as E85 ethanol gasoline), the system also uses the ignition angle limit of the alcohol fuel used for bench calibration. When the user applies high-grade alcohol fuel, the system has a lower ignition angle limit, and the vehicle cannot exert normal power. And when high-grade alcohol fuel is used in actual use scenarios, the corresponding ignition angle cannot continue to increase the ignition angle because it is limited to a lower fuel, which will cause the combustion condition to deteriorate and have a negative impact on emissions. This solution has the problem that the ignition angle cannot be flexibly applied to alcohol fuels of different proportions.

[0004] Therefore, the present application provides a method for determining the ignition angle of alcohol fuel to solve the above technical problems. Summary of the invention

[0005] The purpose of this application is to provide a method, device, medium and electronic device for determining the ignition angle of alcohol fuel, which can solve at least one of the technical problems mentioned above. The specific solution is as follows:

[0006] According to a specific embodiment of the present application, in a first aspect, the present application provides a method for determining an ignition angle of an alcohol fuel, comprising:

[0007] Obtain the air-fuel ratio self-learning value and the jitter value collected by the engine knock sensor;

[0008] obtaining an ideal compensation value of the ignition angle based on the air-fuel ratio self-learning value, and

[0009] Obtaining a knock tendency coefficient based on the jitter value;

[0010] The target compensation value of the ignition angle is obtained based on the ideal compensation value of the ignition angle and the knock tendency coefficient.

[0011] Optionally, the step of obtaining an ideal compensation value of an ignition angle based on the air-fuel ratio self-learning value includes:

[0012] Applying the air-fuel ratio self-learning value to a preset alcohol content fuzzy membership model to obtain an alcohol content value;

[0013] Obtaining an alcohol content difference value based on a difference between the alcohol content value and a preset minimum alcohol content value;

[0014] The ideal compensation value of the ignition angle is obtained based at least on the product of the alcohol content difference and a preset ignition coefficient.

[0015] Optionally, obtaining the ideal compensation value of the ignition angle based at least on the product of the alcohol content difference and a preset ignition coefficient includes:

[0016] Acquiring operating condition information of the engine;

[0017] Determining a preset ideal compensation model corresponding to the operating condition information of the engine;

[0018] The product of the alcohol content difference and the preset ignition coefficient is applied to the preset ideal compensation model to obtain the ideal compensation value of the ignition angle.

[0019] Optionally, before acquiring the ideal compensation value of the ignition angle based on the air-fuel ratio self-learning value, the method further includes:

[0020] performing low-pass filtering on the air-fuel ratio self-learning value;

[0021] The air-fuel ratio self-learning value after low-pass filtering is averaged and filtered.

[0022] Optionally, obtaining the air-fuel ratio self-learning value includes:

[0023] Obtain the air-fuel ratio self-learning value under steady-state conditions.

[0024] Optionally, acquiring a knock tendency coefficient based on the jitter value includes:

[0025] The jitter value is applied to a preset knock tendency coefficient model to obtain the knock tendency coefficient.

[0026] Optionally, before acquiring the knock tendency coefficient based on the jitter value, the method further includes:

[0027] A high-pass filter is performed on the jitter value.

[0028] Optionally, the obtaining of the air-fuel ratio self-learning value and the jitter value collected by the knock sensor of the engine includes:

[0029] When the gradient value of the oil amount change in the fuel tank is detected, the air-fuel ratio self-learning value and the jitter value collected by the engine knock sensor are obtained.

[0030] Optionally, the method further includes:

[0031] When the target compensation value of the ignition angle is greater than or equal to the reference ignition angle stored in the preset ignition angle reference table, the ignition angle dynamic table is initialized based on the preset ignition angle reference table.

[0032] According to a specific embodiment of the present application, in a second aspect, the present application provides a device for determining an ignition angle of an alcohol fuel, comprising:

[0033] A first acquisition unit, used to acquire an air-fuel ratio self-learning value and a jitter value collected by a knock sensor of the engine;

[0034] a second acquisition unit, configured to acquire an ideal compensation value of an ignition angle based on the air-fuel ratio self-learning value, and to acquire a knock tendency coefficient based on the jitter value;

[0035] The obtaining unit is configured to obtain a target compensation value of the ignition angle based on the ideal compensation value of the ignition angle and the knock tendency coefficient.

[0036] Optionally, the step of obtaining an ideal compensation value of an ignition angle based on the air-fuel ratio self-learning value includes:

[0037] Applying the air-fuel ratio self-learning value to a preset alcohol content fuzzy membership model to obtain an alcohol content value;

[0038] Obtaining an alcohol content difference value based on a difference between the alcohol content value and a preset minimum alcohol content value;

[0039] The ideal compensation value of the ignition angle is obtained based at least on the product of the alcohol content difference and a preset ignition coefficient.

[0040] Optionally, obtaining the ideal compensation value of the ignition angle based at least on the product of the alcohol content difference and a preset ignition coefficient includes:

[0041] Acquiring operating condition information of the engine;

[0042] Determining a preset ideal compensation model corresponding to the operating condition information of the engine;

[0043] The product of the alcohol content difference and the preset ignition coefficient is applied to the preset ideal compensation model to obtain the ideal compensation value of the ignition angle.

[0044] Optionally, the device further includes:

[0045] A low-pass filtering unit, configured to perform low-pass filtering on the air-fuel ratio self-learning value before obtaining an ideal compensation value of an ignition angle based on the air-fuel ratio self-learning value;

[0046] The mean filter unit is used to perform mean filtering on the air-fuel ratio self-learning value after low-pass filtering.

[0047] Optionally, obtaining the air-fuel ratio self-learning value includes:

[0048] Obtain the air-fuel ratio self-learning value under steady-state conditions.

[0049] Optionally, acquiring a knock tendency coefficient based on the jitter value includes:

[0050] The jitter value is applied to a preset knock tendency coefficient model to obtain the knock tendency coefficient.

[0051] Optionally, the device further comprises:

[0052] A high-pass filtering unit is used to perform high-pass filtering on the jitter value before obtaining the knock tendency coefficient based on the jitter value.

[0053] Optionally, the obtaining of the air-fuel ratio self-learning value and the jitter value collected by the knock sensor of the engine includes:

[0054] When the gradient value of the oil amount change in the fuel tank is detected, the air-fuel ratio self-learning value and the jitter value collected by the engine knock sensor are obtained.

[0055] Optionally, the device further comprises:

[0056] The initialization unit is used to initialize the ignition angle dynamic table based on the preset ignition angle reference table when the target compensation value of the ignition angle is greater than or equal to the reference ignition angle stored in the preset ignition angle reference table.

[0057] According to a specific embodiment of the present application, in a third aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, and when the program is executed by a processor, the method for determining the ignition angle of the alcohol fuel as described in any one of the above items is implemented.

[0058] According to the specific implementation of the present application, in a fourth aspect, the present application provides an electronic device, comprising: one or more processors; a storage device for storing one or more programs, when the one or more programs are executed by the one or more processors, the one or more processors implement the method for determining the ignition angle of alcohol fuel as described in any of the above items.

[0059] Compared with the prior art, the above solution of the embodiment of the present application has at least the following beneficial effects:

[0060] The present application provides a method, device, medium and electronic device for determining the ignition angle of alcohol fuel. The method comprises: obtaining an air-fuel ratio self-learning value and a jitter value collected by a knock sensor of an engine; obtaining an ideal compensation value of the ignition angle based on the air-fuel ratio self-learning value, and obtaining a knock tendency coefficient based on the jitter value; and obtaining a target compensation value of the ignition angle based on the ideal compensation value of the ignition angle and the knock tendency coefficient. The target compensation value of the ignition angle is obtained by obtaining the air-fuel ratio self-learning value and the jitter value collected by the knock sensor of the engine, thereby realizing automatic adjustment of the ignition angle to the vicinity of the optimal ignition angle, i.e., the ignition angle at the knock boundary, under different proportions of alcohol fuel. The optimal power output and the optimal in-cylinder combustion can be achieved under different proportions of alcohol fuel, and calibration tests of different proportions of alcohol fuel on a test bench are not required. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 A flow chart showing a method for determining an ignition angle of an alcohol fuel according to an embodiment of the present application is shown;

[0062] Figure 2 A schematic diagram showing a preset alcohol content fuzzy membership model of a method for determining an ignition angle of an alcohol fuel according to an embodiment of the present application;

[0063] Figure 3 A schematic diagram showing a preset knock tendency coefficient model of a method for determining an ignition angle of an alcohol fuel according to an embodiment of the present application;

[0064] Figure 4 A unit block diagram of a device for determining an ignition angle of alcohol fuel according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0065] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0066] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two.

[0067] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0068] It should be understood that although the terms first, second, third, etc. may be used to describe in the embodiments of the present application, these descriptions should not be limited to these terms. These terms are only used to distinguish the descriptions. For example, without departing from the scope of the embodiments of the present application, the first may also be referred to as the second, and similarly, the second may also be referred to as the first.

[0069] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0070] It should also be noted that the term "includes", "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, so that a commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the commodity or device including the elements.

[0071] It should be particularly noted that any symbols and / or numbers in the specification that are not marked in the accompanying drawings are not drawing marks.

[0072] The optional embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0073] The embodiment provided in the present application is an embodiment of a method for determining the ignition angle of alcohol fuel.

[0074] Combine the following Figure 1 The embodiments of the present application are described in detail.

[0075] Step S101, obtaining the air-fuel ratio self-learning value and the jitter value collected by the engine knock sensor.

[0076] The air-fuel ratio is the mass ratio of air to fuel in the mixture. It is usually expressed in grams of air consumed when each gram of fuel is burned.

[0077] The air-fuel ratio self-learning value refers to the air-fuel ratio obtained after ignition angle compensation.

[0078] When the engine (gasoline engine) is working, the ignition timing has a great influence on the engine's working performance. Ignition is the spark plug jumping before the piston reaches the compression top dead center, igniting the combustible mixture in the combustion chamber. From the ignition moment to the piston reaching the compression top dead center, the angle that the crankshaft rotates during this period is called the ignition angle. The ignition angle that enables the engine to achieve the best power, economy and best emissions is called the optimal ignition angle.

[0079] Engine knock means that under certain conditions (such as too high compression ratio), the combustion of gasoline engines becomes abnormal, the pressure curve shows high frequency and large fluctuations, and the dp / dt value near the top dead center fluctuates sharply to (dp / dt)max=0.2Mpa / us. At this time, the flame propagation speed and the shape of the flame front change sharply. This phenomenon is called deflagration, and knock is the external reaction of deflagration.

[0080] The knock sensor is installed in the middle of the engine cylinder. For example, if the engine is a four-cylinder engine, it is installed between cylinders 2 and 3, or one between cylinders 1 and 2, and one between cylinders 3 and 4. Its function is to measure the vibration value of the engine and to adjust the ignition angle when the engine knocks.

[0081] In some specific embodiments, the step of obtaining the air-fuel ratio self-learning value includes:

[0082] Step S101a, obtaining the air-fuel ratio self-learning value under steady-state conditions.

[0083] Steady-state operating conditions refer to operating conditions in which the engine speed is between 1000rpm-2500rpm, the load is between 10%-40%, and the speed change gradient and the load change gradient are both within the preset change gradient range.

[0084] In this specific implementation, the target compensation value of the ignition angle is obtained only under steady-state conditions, and the ignition angle is adjusted to ensure that the engine effectively obtains the best power, economy and emissions. It is avoided to adjust the ignition angle when the operating conditions fluctuate violently, causing unnecessary fuel loss and increasing emission pollution.

[0085] In some other specific embodiments, the obtaining of the air-fuel ratio self-learning value and the jitter value collected by the knock sensor of the engine includes:

[0086] Step S101b, when the gradient value of the oil amount change in the fuel tank is detected, the air-fuel ratio self-learning value and the jitter value collected by the knock sensor of the engine are obtained.

[0087] In this specific implementation, a start condition is set for the scheme to determine whether the driver has stepped on the gas pedal. When the driver steps on the gas pedal, the fuel supply signal can be obtained by calculating the gradient value of the oil volume in the fuel tank, and the method can be used. This reduces the impact of frequent adjustment of the ignition angle on vehicle driving.

[0088] Step S103, obtaining an ideal compensation value of the ignition angle based on the air-fuel ratio self-learning value, and obtaining a knock tendency coefficient based on the jitter value.

[0089] The ideal compensation value obtained is only a theoretical compensation value and does not fully meet the optimal power, economy and optimal emissions.

[0090] A high amplitude jitter value indicates a high tendency to knock, and a low amplitude jitter value indicates a low tendency to knock.

[0091] The knock tendency coefficient is represented by 0 to 1. When the knock tendency is the highest, the knock tendency coefficient is 0; when the knock tendency is the lowest, the knock tendency coefficient is 1.

[0092] In some specific embodiments, the step of obtaining an ideal compensation value of an ignition angle based on the air-fuel ratio self-learning value comprises the following steps:

[0093] Step S103a-1, applying the air-fuel ratio self-learning value to a preset alcohol content fuzzy membership model to obtain an alcohol content value.

[0094] Since the calculation of alcohol content using the air-fuel ratio self-learning value will be affected by the system oil circuit deviation and transient conditions, if the calculated alcohol content is directly used for ignition angle control, the system will have large overshoot or fluctuation. Therefore, this specific embodiment provides a preset alcohol content fuzzy membership model obtained through testing.

[0095] like Figure 2 As shown, the preset alcohol content fuzzy membership model includes the correspondence between the air-fuel ratio self-learning value and the alcohol content value. The preset alcohol content fuzzy membership model establishes a correspondence between the air-fuel ratio self-learning value and the alcohol content value. This avoids the error caused by the air-fuel ratio self-learning value calculating the alcohol content, which leads to the misadjustment of the ignition angle. The step curve in the preset alcohol content fuzzy membership model reduces the frequency of ignition angle adjustment and improves system stability.

[0096] Step S103a-2, obtaining an alcohol content difference value based on the difference between the alcohol content value and a preset minimum alcohol content value.

[0097] For example, ΔY=Y1-Y0; wherein ΔY represents the alcohol content difference, Y1 represents the alcohol content value, and Y0 represents the preset minimum alcohol content value.

[0098] Step S103a-3, obtaining the ideal compensation value of the ignition angle based at least on the product of the alcohol content difference and the preset ignition coefficient.

[0099] For example, B=ΔYxe; B represents the ideal compensation value, ΔY represents the alcohol content difference, and e represents the preset ignition coefficient.

[0100] In some specific embodiments, obtaining the ideal compensation value of the ignition angle based at least on the product of the alcohol content difference and a preset ignition coefficient comprises the following steps:

[0101] Step S103a-31, obtaining the operating condition information of the engine.

[0102] The engine operating condition information refers to the engine's working status information.

[0103] Step S103a-32, determining a preset ideal compensation model corresponding to the operating condition information of the engine.

[0104] Step S103a-33, applying the product of the alcohol content difference and the preset ignition coefficient to the preset ideal compensation model to obtain the ideal compensation value of the ignition angle.

[0105] In this specific embodiment, a corresponding preset ideal compensation model is provided for different working condition information of the engine. The preset ideal compensation model obtained through testing includes the corresponding relationship between the product value of the alcohol content difference and the preset ignition coefficient and the ideal compensation value. Thus, different preset ideal compensation models are provided for different working conditions of the engine, and then the target compensation value of the ignition angle suitable for the working condition is provided, thereby improving the accuracy of the target compensation value.

[0106] In some specific embodiments, before obtaining the ideal compensation value of the ignition angle based on the air-fuel ratio self-learning value, the following steps are also included:

[0107] Step S102a-1, low-pass filtering the air-fuel ratio self-learning value.

[0108] In this specific embodiment, the air-fuel ratio self-learning value is low-pass filtered to prevent the air-fuel ratio fluctuation caused by uneven alcohol content in the fuel tank or other interference from affecting the calculation of the alcohol content, thereby reducing high-frequency fluctuations caused by interference.

[0109] Step S102a-2, performing mean filtering on the air-fuel ratio self-learning value after low-pass filtering.

[0110] In this specific embodiment, the air-fuel ratio self-learning value after low-pass filtering is mean filtered, and the air-fuel ratio self-learning value under steady-state conditions is selected to ensure that a reliable air-fuel ratio self-learning value can be obtained, and then a reliable target compensation value of the ignition angle can be obtained to avoid fuel loss caused by drastic fluctuations.

[0111] In some specific embodiments, obtaining the knock tendency coefficient based on the jitter value includes:

[0112] Step S103b: applying the jitter value to a preset knock tendency coefficient model to obtain the knock tendency coefficient.

[0113] This specific embodiment provides a preset knock tendency coefficient model obtained through testing.

[0114] like Figure 3 As shown, the preset knock tendency coefficient model includes the corresponding relationship between the jitter value and the knock tendency coefficient. Thus, the knock tendency coefficient is closer to reality. The step curve in the preset knock tendency coefficient model can ensure the stability of the target compensation value of the ignition angle and reduce the fuel loss caused by violent fluctuations.

[0115] In some specific embodiments, before acquiring the knock tendency coefficient based on the jitter value, the method further includes:

[0116] Step S102b: high-pass filter the jitter value.

[0117] In this specific embodiment, the jitter value is filtered by high-pass filtering to ensure that the valid jitter value can be retained.

[0118] Step S105 , obtaining a target compensation value of the ignition angle based on the ideal compensation value of the ignition angle and the knock tendency coefficient.

[0119] When the alcohol content is high, the target compensation value of the ignition angle will be increased; when the degree of knock is high, the target compensation value of the ignition angle will be reduced. When the knock boundary is reached, the knock tendency coefficient is 0, and the target compensation value of the ignition angle will no longer be increased.

[0120] The embodiment of the present application obtains the target compensation value of the ignition angle through the air-fuel ratio self-learning value and the jitter value collected by the engine knock sensor, and realizes the automatic adjustment of the ignition angle to the vicinity of the optimal ignition angle, that is, the ignition angle at the knock boundary under different proportions of alcohol fuel. It can achieve the best power output and the best in-cylinder combustion under different proportions of alcohol fuel, and there is no need to calibrate and test different proportions of alcohol fuel on the test bench.

[0121] In some specific embodiments, the method further comprises:

[0122] Step S111 : when the target compensation value of the ignition angle is greater than or equal to the reference ignition angle stored in the preset ignition angle reference table, initializing the ignition angle dynamic table based on the preset ignition angle reference table.

[0123] The preset ignition angle reference table and the ignition angle dynamic table are stored in the memory of the vehicle computer system. The ignition angle dynamic table stores the target compensation value of the dynamically obtained ignition angle, while the preset ignition angle reference table stores the reference ignition angle. The preset ignition angle reference table stores the reference data, which will not change. When the ignition angle dynamic table is abnormal, the data in the preset ignition angle reference table can be initialized through the data in the ignition angle dynamic table. This eliminates the impact of abnormal data on the vehicle.

[0124] The present application also provides a device embodiment that is based on the above embodiment, which is used to implement the method steps described in the above embodiment. The explanation based on the same name meaning is the same as the above embodiment, and has the same technical effect as the above embodiment, which will not be repeated here.

[0125] like Figure 4 As shown, the present application provides a device 400 for determining an ignition angle of an alcohol fuel, comprising:

[0126] The first acquisition unit 401 is used to acquire the air-fuel ratio self-learning value and the jitter value collected by the knock sensor of the engine;

[0127] A second acquisition unit 403 is used to acquire an ideal compensation value of an ignition angle based on the air-fuel ratio self-learning value, and to acquire a knock tendency coefficient based on the jitter value;

[0128] The obtaining unit 405 is configured to obtain the target compensation value of the ignition angle based on the ideal compensation value of the ignition angle and the knock tendency coefficient.

[0129] Optionally, the step of obtaining an ideal compensation value of an ignition angle based on the air-fuel ratio self-learning value includes:

[0130] Applying the air-fuel ratio self-learning value to a preset alcohol content fuzzy membership model to obtain an alcohol content value;

[0131] Obtaining an alcohol content difference value based on a difference between the alcohol content value and a preset minimum alcohol content value;

[0132] The ideal compensation value of the ignition angle is obtained based at least on the product of the alcohol content difference and a preset ignition coefficient.

[0133] Optionally, obtaining the ideal compensation value of the ignition angle based at least on the product of the alcohol content difference and a preset ignition coefficient includes:

[0134] Acquiring operating condition information of the engine;

[0135] Determining a preset ideal compensation model corresponding to the operating condition information of the engine;

[0136] The product of the alcohol content difference and the preset ignition coefficient is applied to the preset ideal compensation model to obtain the ideal compensation value of the ignition angle.

[0137] Optionally, the device further includes:

[0138] A low-pass filtering unit, configured to perform low-pass filtering on the air-fuel ratio self-learning value before obtaining an ideal compensation value of an ignition angle based on the air-fuel ratio self-learning value;

[0139] The mean filter unit is used to perform mean filtering on the air-fuel ratio self-learning value after low-pass filtering.

[0140] Optionally, obtaining the air-fuel ratio self-learning value includes:

[0141] Obtain the air-fuel ratio self-learning value under steady-state conditions.

[0142] Optionally, acquiring a knock tendency coefficient based on the jitter value includes:

[0143] The jitter value is applied to a preset knock tendency coefficient model to obtain the knock tendency coefficient.

[0144] Optionally, the device further comprises:

[0145] A high-pass filtering unit is used to perform high-pass filtering on the jitter value before obtaining the knock tendency coefficient based on the jitter value.

[0146] Optionally, the obtaining of the air-fuel ratio self-learning value and the jitter value collected by the knock sensor of the engine includes:

[0147] When the gradient value of the oil amount change in the fuel tank is detected, the air-fuel ratio self-learning value and the jitter value collected by the engine knock sensor are obtained.

[0148] Optionally, the device further comprises:

[0149] The initialization unit is used to initialize the ignition angle dynamic table based on the preset ignition angle reference table when the target compensation value of the ignition angle is greater than or equal to the reference ignition angle stored in the preset ignition angle reference table.

[0150] The embodiment of the present application obtains the target compensation value of the ignition angle through the air-fuel ratio self-learning value and the jitter value collected by the engine knock sensor, and realizes the automatic adjustment of the ignition angle to the vicinity of the optimal ignition angle, that is, the ignition angle at the knock boundary under different proportions of alcohol fuel. It can achieve the best power output and the best in-cylinder combustion under different proportions of alcohol fuel, and there is no need to calibrate and test different proportions of alcohol fuel on the test bench.

[0151] This embodiment provides an electronic device, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the method steps described in the above embodiment.

[0152] An embodiment of the present application provides a non-volatile computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions can execute the method steps described in the above embodiment.

[0153] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other. For the system or device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description.

[0154] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for determining the ignition angle of alcohol fuel, characterized in that: include: Obtain the air-fuel ratio self-learning value and the jitter value collected by the engine knock sensor; obtaining an ideal compensation value of the ignition angle based on the air-fuel ratio self-learning value, and Obtaining a knock tendency coefficient based on the jitter value; The target compensation value of the ignition angle is obtained based on the ideal compensation value of the ignition angle and the knock tendency coefficient.

2. The method according to claim 1, characterized in that The step of obtaining an ideal compensation value of an ignition angle based on the air-fuel ratio self-learning value comprises: Applying the air-fuel ratio self-learning value to a preset alcohol content fuzzy membership model to obtain an alcohol content value; Obtaining an alcohol content difference value based on a difference between the alcohol content value and a preset minimum alcohol content value; The ideal compensation value of the ignition angle is obtained based at least on the product of the alcohol content difference and a preset ignition coefficient.

3. The method according to claim 2, characterized in that The step of obtaining the ideal compensation value of the ignition angle based at least on the product of the alcohol content difference and a preset ignition coefficient comprises: Acquiring operating condition information of the engine; Determining a preset ideal compensation model corresponding to the operating condition information of the engine; The product of the alcohol content difference and the preset ignition coefficient is applied to the preset ideal compensation model to obtain the ideal compensation value of the ignition angle.

4. The method according to claim 1, characterized in that Before obtaining the ideal compensation value of the ignition angle based on the air-fuel ratio self-learning value, the method further includes: performing low-pass filtering on the air-fuel ratio self-learning value; The air-fuel ratio self-learning value after low-pass filtering is averaged and filtered.

5. The method according to claim 1, characterized in that The obtaining of the air-fuel ratio self-learning value comprises: Obtain the air-fuel ratio self-learning value under steady-state conditions.

6. The method according to claim 1, characterized in that The acquiring the knock tendency coefficient based on the jitter value includes: The jitter value is applied to a preset knock tendency coefficient model to obtain the knock tendency coefficient.

7. The method according to claim 1, characterized in that Before acquiring the knock tendency coefficient based on the jitter value, the method further includes: A high-pass filter is performed on the jitter value.

8. The method according to claim 1, characterized in that The obtaining of the air-fuel ratio self-learning value and the jitter value collected by the knock sensor of the engine includes: When the gradient value of the oil amount change in the fuel tank is detected, the air-fuel ratio self-learning value and the jitter value collected by the engine knock sensor are obtained.

9. The method according to claim 1, characterized in that: The method further comprises: When the target compensation value of the ignition angle is greater than or equal to the reference ignition angle stored in the preset ignition angle reference table, the ignition angle dynamic table is initialized based on the preset ignition angle reference table.

10. A device for determining the ignition angle of alcohol fuel, characterized in that: include: A first acquisition unit, used to acquire an air-fuel ratio self-learning value and a jitter value collected by a knock sensor of the engine; a second acquisition unit, configured to acquire an ideal compensation value of an ignition angle based on the air-fuel ratio self-learning value, and to acquire a knock tendency coefficient based on the jitter value; The obtaining unit is configured to obtain a target compensation value of the ignition angle based on the ideal compensation value of the ignition angle and the knock tendency coefficient.

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