Method, device and system for confirming ignition advance angle

Abstract

The present invention relates to the field of engine technology, and in particular, provides a method, device and system for confirming an ignition advance angle, wherein the method for confirming an ignition advance angle comprises: obtaining a knock voltage preset value V1 when the engine has a minimum knock index and a knock voltage preset value V2 when the engine has a maximum knock index; selecting multiple knock indexes based on the minimum knock index and the maximum knock index; obtaining multiple knock voltage variances; calculating the knock voltage preset value variance; obtaining the engine's knock voltage actual value and the knock voltage actual value variance, and confirming the ignition advance angle according to the relationship between the knock voltage actual value and the knock voltage preset value V1 and the knock voltage preset value V2 and the relationship between the knock voltage actual value variance and the knock voltage preset value variance. The method, device and system for confirming an ignition advance angle provided by the present invention well solve the problem of how to confirm the optimal ignition advance angle so that the engine can achieve the optimal combustion efficiency.

Description

Technical Field

[0001] The present invention relates to the field of engine technology, and in particular to a method, device and system for confirming an ignition advance angle. Background Art

[0002] This section merely provides background information related to the present disclosure and is not necessarily prior art.

[0003] Optimizing the control parameters of the engine and striving to make it run in the best state is an important part of engine control. For high-power engines, running at the edge of slight detonation can ensure that it obtains the best economy.

[0004] In the existing engine control, the knock sensor mainly collects knock signals, which are mainly used to avoid excessive knock and damage to the gas engine. The existing engine control method is to postpone the ignition advance angle when it finds that the knock signal exceeds the limit value to ensure that the gas engine is away from the knock state. This will result in the inability to achieve optimal control of the engine economy. Therefore, determining the optimal ignition advance angle to enable the engine to achieve the optimal combustion efficiency and improve economy has become an urgent problem to be solved.

[0005] Supplementary explanation: Before the flame of normal ignition is reached, the end of combustion spontaneously ignites, forming a deflagration state with the flame of normal ignition. Detonation, also known as deflagration, is an abnormal combustion phenomenon. Weak detonation can improve fuel economy, but long-term detonation can easily damage the engine. The ignition advance angle is the most direct and effective means to control engine knock. Generally, the larger the ignition advance angle, the easier it is to have knock or the stronger the knock, the better the engine economy. The smaller the ignition advance angle, the less likely it is to have knock or the weaker the knock, the worse the engine economy. Summary of the invention

[0006] The purpose of the present invention is to at least solve the problem of how to determine the optimal ignition advance angle so that the engine can achieve the optimal combustion efficiency. This purpose is achieved through the following technical solutions:

[0007] A first aspect of the present invention provides a method for confirming an ignition advance angle, comprising:

[0008] Obtaining a knock voltage preset value V1 when the engine reaches a minimum knock index of slight knock and a knock voltage preset value V2 when the engine reaches a maximum knock index of slight knock;

[0009] Selecting a plurality of knock indices based on a minimum knock index and a maximum knock index;

[0010] Acquire a plurality of knock voltage variances corresponding to the plurality of knock indices;

[0011] Calculating an average value of the plurality of knock voltage variances to obtain a knock voltage preset value variance;

[0012] The actual knock voltage value and the actual knock voltage value variance of the engine in actual operating conditions are obtained, and the ignition advance angle of the engine is confirmed according to the relationship between the actual knock voltage value and the knock voltage preset value V1 and the knock voltage preset value V2, and the relationship between the actual knock voltage value variance and the knock voltage preset value variance.

[0013] According to the method for confirming the ignition advance angle of the present invention, the knock voltage preset value V1 and the knock voltage preset value V2 are used to determine the knock stable operation boundary, and the knock voltage preset value variance is obtained as the knock stable operation line. The knock voltage actual value and the knock voltage actual value variance obtained by testing the engine to be tested are compared with the knock stable operation boundary and the knock stable operation line respectively, and the ignition advance angle is adjusted according to the comparison result, ultimately ensuring that the engine is controlled within the knock stable operation boundary and can run stably; the problem of how to confirm the optimal ignition advance angle so that the engine can achieve the optimal combustion efficiency is well solved.

[0014] In addition, the method for confirming the ignition advance angle according to the present invention may also have the following additional technical features:

[0015] In some embodiments of the present invention, the step of determining the ignition advance angle of the engine according to the relationship between the actual knock voltage value and the preset knock voltage value V1 and the preset knock voltage value V2 and the relationship between the actual knock voltage value variance and the preset knock voltage value variance includes:

[0016] Based on the fact that the actual value of the knock voltage is greater than the preset value V1 of the knock voltage and less than the preset value V2 of the knock voltage, obtaining a variance of the actual value of the knock voltage;

[0017] Based on the fact that the actual knock voltage variance is smaller than the preset knock voltage variance, the ignition advance angle meets the requirement.

[0018] In some embodiments of the present invention, the step of obtaining a plurality of knock voltage variances corresponding to the plurality of knock indices includes:

[0019] Based on the minimum knock index, the maximum knock index and the multiple knock indexes, and based on the same time interval of engine operation, respectively obtaining corresponding multiple groups of knock voltage preset values;

[0020] The corresponding plurality of knock voltage variances are acquired based on the plurality of groups of knock voltage preset values.

[0021] In some embodiments of the present invention, the step of obtaining the actual value of the knock voltage and the variance of the actual value of the knock voltage when the engine is in an actual operating condition includes:

[0022] Based on the engine running multiple working cycles in actual operating conditions, multiple knock voltage values ​​of the engine are obtained respectively;

[0023] A knock voltage actual value is obtained based on an average value of the plurality of knock voltage values.

[0024] In some embodiments of the present invention, the step of obtaining the variance of the actual knock voltage value based on the actual knock voltage value being greater than the preset knock voltage value V1 and less than the preset knock voltage value V2 further includes:

[0025] Based on the fact that the actual knock voltage value is greater than the preset knock voltage value V1 and less than the preset knock voltage value V2, and based on the plurality of knock voltage values ​​of the engine, the actual knock voltage value variance is acquired.

[0026] In some embodiments of the present invention, the step of obtaining the variance of the actual knock voltage value based on the actual knock voltage value being greater than the preset knock voltage value V1 and less than the preset knock voltage value V2 further includes:

[0027] Based on the fact that the actual knock voltage value is less than the preset knock voltage value V1, the ignition advance angle is increased until the actual knock voltage value is greater than the preset knock voltage value V1 and less than the preset knock voltage value V2, and the variance of the actual knock voltage value is obtained.

[0028] In some embodiments of the present invention, the step of obtaining the variance of the actual knock voltage value based on the actual knock voltage value being greater than the preset knock voltage value V1 and less than the preset knock voltage value V2 further includes:

[0029] Based on the fact that the actual knock voltage value is greater than the preset knock voltage value V2, the ignition advance angle is reduced until the actual knock voltage value is greater than the preset knock voltage value V1 and less than the preset knock voltage value V2, and the variance of the actual knock voltage value is obtained.

[0030] In some embodiments of the present invention, the step of determining that the actual knock voltage variance is less than the preset knock voltage variance and the ignition advance angle meets the requirement further includes:

[0031] Based on the fact that the actual knock voltage variance is greater than the preset knock voltage variance, the ignition advance angle is reduced until the actual knock voltage variance is less than the preset knock voltage variance, and the ignition advance angle meets the requirement.

[0032] A second aspect of the present invention further provides a device for confirming an ignition advance angle, the device being used to execute the method for confirming an ignition advance angle as described above, comprising:

[0033] An acquisition unit, a control unit, a calculation unit, and a comparison unit;

[0034] The acquisition unit is used to collect the engine knock signal and acquire the knock voltage preset value V1 and the knock voltage preset value V2;

[0035] The control unit is used to store a knock voltage preset value V1, a knock voltage preset value V2 and a knock voltage preset value variance;

[0036] The calculation unit is used to calculate an average value of a plurality of knock voltage variances;

[0037] The comparison unit is used for comparing the actual knock voltage value with the preset knock voltage value V1, the actual knock voltage value with the preset knock voltage value V2, and the actual knock voltage value variance with the preset knock voltage value variance.

[0038] The device for confirming the ignition advance angle according to the embodiment of the present invention has the same advantages as the method for confirming the ignition advance angle described above, which will not be described in detail herein.

[0039] The third aspect of the present invention also provides a system for confirming an ignition advance angle, the system comprising the device for confirming an ignition advance angle as described above, and also comprising a memory, wherein a program in the memory stores the method for confirming an ignition advance angle as described above.

[0040] The system for confirming the ignition advance angle according to the embodiment of the present invention has the same advantages as the method for confirming the ignition advance angle described above, which will not be described in detail herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0042] Figure 1 A schematic diagram of a flow chart of a method for confirming an ignition advance angle according to a first embodiment of the present invention is shown;

[0043] Figure 2 The flowchart of the method for confirming the ignition advance angle according to the second embodiment of the present invention is schematically shown. DETAILED DESCRIPTION

[0044] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0045] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0046] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0047] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

[0048] See also Figure 1 As shown, the first aspect of the present invention provides a method for confirming an ignition advance angle, comprising:

[0049] Obtaining a knock voltage preset value V1 when the engine reaches a minimum knock index of slight knock and a knock voltage preset value V2 when the engine reaches a maximum knock index of slight knock;

[0050] Selecting a plurality of knock indices based on a minimum knock index and a maximum knock index;

[0051] Acquire a plurality of knock voltage variances corresponding to the plurality of knock indices;

[0052] Calculating an average value of the plurality of knock voltage variances to obtain a knock voltage preset value variance;

[0053] The actual knock voltage value and the actual knock voltage value variance of the engine in actual operating conditions are obtained, and the ignition advance angle of the engine is confirmed according to the relationship between the actual knock voltage value and the knock voltage preset value V1 and the knock voltage preset value V2, and the relationship between the actual knock voltage value variance and the knock voltage preset value variance.

[0054] According to the method for confirming the ignition advance angle of the present invention, the knock voltage preset value V1 and the knock voltage preset value V2 are used to determine the knock stable operation boundary, and the knock voltage preset value variance is obtained as the knock stable operation line. The knock voltage actual value and the knock voltage actual value variance obtained by testing the engine to be tested are compared with the knock stable operation boundary and the knock stable operation line respectively, and the ignition advance angle is adjusted according to the comparison result, ultimately ensuring that the engine is controlled within the knock stable operation boundary and can run stably; the problem of how to confirm the optimal ignition advance angle so that the engine can achieve the optimal combustion efficiency is well solved.

[0055] More specifically, in some embodiments of the present invention, the step of confirming the ignition advance angle of the engine according to the relationship between the actual value of the knock voltage and the preset value of the knock voltage V1 and the preset value of the knock voltage V2 and the relationship between the variance of the actual value of the knock voltage and the variance of the preset value of the knock voltage includes: based on the actual value of the knock voltage being greater than the preset value of the knock voltage V1 and less than the preset value of the knock voltage V2, obtaining the variance of the actual value of the knock voltage; based on the variance of the actual value of the knock voltage being less than the variance of the preset value of the knock voltage, the ignition advance angle meets the requirements. In other words, as long as the above requirements are met, it indicates that the ignition advance angle meets the requirements.

[0056] Specifically, in traditional high-power engine control, the knock voltage value is often detected and a preset knock voltage value is set as a limit. When the limit is exceeded, the ignition advance angle is reduced to prevent the engine from running into the knock area.

[0057] In some embodiments of the present invention, the engine can use a combustion analyzer to define a stable operation boundary with slight knock. The so-called stable operation boundary with slight knock means that there is slight knock but it is not strong. It is generally determined subjectively by the testing staff. At this time, the fuel economy of the engine is better and it is not easy to damage the engine. By selecting two different knock indexes of the combustion analyzer, the knock voltage preset value of the knock sensor is read accordingly. More specifically, when the knock index of the combustion analyzer is a% (the minimum knock index of slight knock), the knock voltage preset value V1 is obtained. When the knock index of the combustion analyzer is (a+b)% (the maximum knock index of slight knock), the knock voltage preset value V2 is obtained. The knock stable operation boundary is determined using the knock voltage preset value V1 and the knock voltage preset value V2. When the ignition advance angle is within the knock stable operation boundary, it indicates that the fuel economy of the engine is better at this time.

[0058] Of course, in some embodiments of the present invention, it is necessary to select multiple knock indices between the minimum knock index and the maximum knock index, and then obtain multiple knock voltage variances corresponding to the multiple knock indices. The specific process is:

[0059] Based on the knock index of the combustion analyzer being within a range of a% of the minimum knock index and (a+b)% of the maximum knock index, a plurality of knock indices are selected;

[0060] Based on the minimum knock index a%, the maximum knock index (a+b)% and multiple knock indexes, and based on the same time interval of engine operation, corresponding multiple groups of knock voltage preset values ​​are respectively obtained.

[0061] It is worth noting that multiple knock indexes can be set to 1, 2, 3 and above, etc.; more specifically, when the intermediate knock index is 3, the engine is run for the same time interval (the time interval is not restricted) under each knock index of [a%, (a+b1)%, (a+b2)%, (a+b3)%, (a+b)%] in sequence, and multiple groups of knock voltage preset values ​​are obtained through the knock sensor (5 groups here, including 2 groups of knock voltage preset values ​​corresponding to the minimum knock index a% and the maximum knock index (a+b)%).

[0062] In addition, a knock index of the combustion analyzer corresponds to a knock voltage value. When the knock index of the combustion analyzer reaches the preset index, the combustion analyzer sends a knock signal to the ECU control system. The knock sensor collects the engine's knock signal and converts it into a knock voltage value.

[0063] In some embodiments of the present invention, the step of obtaining a plurality of knock voltage variances corresponding to the plurality of knock indices and calculating an average value of the plurality of knock voltage variances to obtain a knock voltage preset value variance includes:

[0064] Based on the multiple groups of knock voltage preset values, respectively calculating the corresponding multiple knock voltage variances;

[0065] The average value of the plurality of knock voltage variances is calculated to obtain a final knock voltage preset value variance.

[0066] Combined with the above discussion, when the intermediate knock index is 3, there are 5 groups of knock voltage preset values, and the knock voltage variances S1, S2, S3, S4, and S5 are calculated under each knock index respectively, and the average value of multiple knock voltage variances is obtained to obtain the knock voltage preset value variance S0, and finally the knock voltage preset value V1, the knock voltage preset value V2, and the knock voltage preset value variance S0 are written into the ECU control system for subsequent comparison; of course, by detecting the knock voltage preset value variance S0, the stability of the engine can be determined, and ultimately it is guaranteed that the engine is controlled within the knock stable operation boundary and can operate stably, with higher control accuracy and better stability.

[0067] Specifically, the next step is to detect the engine stability. At this time, the engine is running in actual operating conditions, and the knock sensor can continuously collect the engine knock signal and convert it into a knock voltage value. In this step, it should be noted that the engine needs to run multiple working cycles so that the knock sensor can obtain multiple knock voltage values ​​of the engine respectively. The reason for this setting is that multiple sets of data can avoid the errors that may be caused by a single set of data, so that the detection results are more accurate.

[0068] Based on the fact that the engine needs to run multiple working cycles, where one working cycle refers to the four major strokes of the engine (intake, compression, power, and exhaust), the engine can obtain a knock voltage value in one working cycle; finally, the average of multiple knock voltage values ​​is taken to obtain the actual value of the knock voltage.

[0069] It is worth noting that the need for the engine to run multiple working cycles is essentially the same as the need for the engine to run one end of the time interval when obtaining multiple sets of knock voltage change values ​​mentioned above. Both are for the purpose of obtaining multiple sets of data. This is because the time interval at one end of the engine running is equivalent to the engine running multiple working cycles.

[0070] See also Figure 2 As shown, specifically, the relationship between the actual value of the knock voltage and the knock voltage preset value V1 and the knock voltage preset value V2 determines whether the ignition advance angle of the engine at this time meets the first requirement. When the ignition advance angle meets the first requirement, it is necessary to further obtain the variance of the actual value of the knock voltage calculated by the multiple knock voltage values, and compare the variance of the actual value of the knock voltage with the variance of the preset value of the knock voltage to determine whether the ignition advance angle finally meets the requirement.

[0071] Among them, when the actual value of the knock voltage is greater than the knock voltage preset value V1 and less than the knock voltage preset value V2, the ignition advance angle meets the first requirement, indicating that the engine working efficiency is good at this time and no change is required. At this time, it is necessary to obtain the variance of the actual value of the knock voltage; and when the actual value of the knock voltage is less than the knock voltage preset value V1, it is necessary to increase the ignition advance angle so that the ignition advance angle is within the stable operation boundary of slight knock, until the actual value of the knock voltage is greater than the knock voltage preset value V1 and less than the knock voltage preset value V2, and the variance of the actual value of the knock voltage is obtained; of course, when the actual value of the knock voltage is greater than the knock voltage preset value V2, it is necessary to reduce the ignition advance angle so that the ignition advance angle is within the stable operation boundary of slight knock, until the actual value of the knock voltage is greater than the knock voltage preset value V1 and less than the knock voltage preset value V2, and the variance of the actual value of the knock voltage is obtained.

[0072] Since the relationship between the variance of the actual knock voltage value and the variance of the preset knock voltage value is determined, the stability of the engine can be detected, and the variance of the actual knock voltage value is calculated by obtaining multiple knock voltage values ​​obtained by running the engine for multiple working cycles. Specifically, when the variance of the actual knock voltage value is smaller than the variance of the preset knock voltage value, the ignition advance angle meets the requirements, indicating that the engine stability is good at this time; and when the variance of the actual knock voltage value is larger than the variance of the preset knock voltage value, it is necessary to reduce the ignition advance angle until the variance of the actual knock voltage value is smaller than the variance of the preset knock voltage value, and the ignition advance angle meets the requirements, so as to make the engine run stably.

[0073] A second aspect of the present invention further provides a device for confirming an ignition advance angle, the device being used to execute the method for confirming an ignition advance angle as described above, comprising:

[0074] An acquisition unit, a control unit, a calculation unit, and a comparison unit;

[0075] The acquisition unit is used to collect the engine knock signal and acquire the knock voltage preset value V1 and the knock voltage preset value V2;

[0076] The control unit is used to store a knock voltage preset value V1, a knock voltage preset value V2 and a knock voltage preset value variance;

[0077] The calculation unit is used to calculate an average value of a plurality of knock voltage variances;

[0078] The comparison unit is used for comparing the actual knock voltage value with the preset knock voltage value V1, the actual knock voltage value with the preset knock voltage value V2, and the actual knock voltage value variance with the preset knock voltage value variance.

[0079] The device for confirming the ignition advance angle according to the embodiment of the present invention has the same advantages as the method for confirming the ignition advance angle described above, which will not be described in detail herein.

[0080] The present invention also provides a system for confirming an ignition advance angle, the system comprising the device for confirming an ignition advance angle as described above, and also comprising a memory, wherein a program in the memory stores the method for confirming an ignition advance angle as described above.

[0081] The system for confirming the ignition advance angle according to the embodiment of the present invention has the same advantages as the method for confirming the ignition advance angle described above, which will not be described in detail herein.

[0082] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method for confirming an ignition advance angle, characterized in that: include: Obtaining a knock voltage preset value V1 when the engine reaches a minimum knock index of slight knock and a knock voltage preset value V2 when the engine reaches a maximum knock index of slight knock; Selecting a plurality of knock indices based on a minimum knock index and a maximum knock index; Acquire a plurality of knock voltage variances corresponding to the plurality of knock indices; Calculating an average value of the plurality of knock voltage variances to obtain a knock voltage preset value variance; Acquire the actual knock voltage value and the actual knock voltage value variance of the engine in actual operating conditions, and confirm the ignition advance angle of the engine according to the relationship between the actual knock voltage value and the knock voltage preset value V1 and the knock voltage preset value V2 and the relationship between the actual knock voltage value variance and the knock voltage preset value variance; Wherein, the step of determining the ignition advance angle of the engine according to the relationship between the actual knock voltage value and the knock voltage preset value V1 and the knock voltage preset value V2 and the relationship between the actual knock voltage value variance and the knock voltage preset value variance includes: Based on the fact that the actual value of the knock voltage is greater than the preset value V1 of the knock voltage and less than the preset value V2 of the knock voltage, obtaining a variance of the actual value of the knock voltage; Based on the fact that the actual knock voltage variance is smaller than the preset knock voltage variance, the ignition advance angle meets the requirement.

2. The method for confirming the ignition advance angle according to claim 1, characterized in that: The step of obtaining a plurality of knock voltage variances corresponding to the plurality of knock indices includes: Based on the minimum knock index, the maximum knock index and the multiple knock indexes, and based on the same time interval of engine operation, respectively obtaining corresponding multiple groups of knock voltage preset values; The corresponding plurality of knock voltage variances are acquired based on the plurality of groups of knock voltage preset values.

3. The method for confirming the ignition advance angle according to claim 1, characterized in that: The step of obtaining the actual knock voltage value and the actual knock voltage value variance of the engine in the actual operating condition includes: Based on the engine running multiple working cycles in actual operating conditions, multiple knock voltage values ​​of the engine are obtained respectively; A knock voltage actual value is obtained based on an average value of the plurality of knock voltage values.

4. The method for confirming the ignition advance angle according to claim 3, characterized in that: The step of obtaining the variance of the actual knock voltage value based on the fact that the actual knock voltage value is greater than the preset knock voltage value V1 and less than the preset knock voltage value V2 further includes: Based on the fact that the actual knock voltage value is greater than the preset knock voltage value V1 and less than the preset knock voltage value V2, and based on the plurality of knock voltage values ​​of the engine, the actual knock voltage value variance is acquired.

5. The method for confirming the ignition advance angle according to claim 3, characterized in that: The step of obtaining the variance of the actual knock voltage value based on the fact that the actual knock voltage value is greater than the preset knock voltage value V1 and less than the preset knock voltage value V2 further includes: Based on the fact that the actual knock voltage value is less than the preset knock voltage value V1, the ignition advance angle is increased until the actual knock voltage value is greater than the preset knock voltage value V1 and less than the preset knock voltage value V2, and the variance of the actual knock voltage value is obtained.

6. The method for confirming the ignition advance angle according to claim 3, characterized in that: The step of obtaining the variance of the actual knock voltage value based on the fact that the actual knock voltage value is greater than the preset knock voltage value V1 and less than the preset knock voltage value V2 further includes: Based on the fact that the actual knock voltage value is greater than the preset knock voltage value V2, the ignition advance angle is reduced until the actual knock voltage value is greater than the preset knock voltage value V1 and less than the preset knock voltage value V2, and the variance of the actual knock voltage value is obtained.

7. The method for confirming the ignition advance angle according to claim 1, characterized in that: The step of the actual knock voltage variance being smaller than the preset knock voltage variance and the ignition advance angle meeting the requirement further includes: Based on the fact that the actual knock voltage variance is greater than the preset knock voltage variance, the ignition advance angle is reduced until the actual knock voltage variance is less than the preset knock voltage variance, and the ignition advance angle meets the requirement.

8. A device for confirming ignition advance angle, characterized in that: The device is used to execute the method for confirming the ignition advance angle described in claim 1, comprising: An acquisition unit, a control unit, a calculation unit, and a comparison unit; The acquisition unit is used to collect the engine knock signal and acquire the knock voltage preset value V1 and the knock voltage preset value V2; The control unit is used to store a knock voltage preset value V1, a knock voltage preset value V2 and a knock voltage preset value variance; The calculation unit is used to calculate an average value of a plurality of knock voltage variances; The comparison unit is used for comparing the actual knock voltage value with the preset knock voltage value V1, the actual knock voltage value with the preset knock voltage value V2, and the actual knock voltage value variance with the preset knock voltage value variance.

9. A system for confirming an ignition advance angle, characterized in that: The system comprises the device for confirming the ignition advance angle as claimed in claim 8 , and also comprises a memory, wherein the program in the memory stores the method for confirming the ignition advance angle as claimed in claim 1 .

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