Engine speed drop analysis and evaluation method and device

Abstract

The present invention provides an engine speed drop analysis and evaluation method and device. The evaluation method includes: obtaining historical operating condition data of the engine; analyzing and processing the historical operating condition data within a preset time interval to determine a corresponding engine speed drop severity index; and determining the engine speed drop evaluation result based on the engine speed drop severity index. The engine speed drop analysis and evaluation method provided by the present invention can effectively quantify the engine speed drop severity by selecting historical operating condition data within a preset time interval to determine the corresponding engine speed drop severity index, improve the accuracy of the speed drop severity evaluation, facilitate the speed drop severity judgment, and improve the speed drop judgment efficiency, thereby achieving precise guidance processing.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical fault detection, and to a method and device for analyzing and evaluating engine speed drop, and also to an electronic device and a processor-readable storage medium. Background Art

[0002] In recent years, with the rapid development of science and technology, the application of mechanical equipment in various construction operations has become more and more common, and engine speed drop often occurs during the operation of mechanical equipment. The main reason for engine speed drop is that external factors cause insufficient engine power output or excessive workload, such as insufficient fuel supply due to oil circuit failure, air leakage or blockage in the intake system leading to incomplete fuel combustion, etc. The speed drop phenomenon that occurs during mechanical operation is divided into mild and severe levels. In fact, during mechanical operation, the engine load changes dynamically, and occasional excessive load may cause speed drop, but in general, if the speed drop is slight, the engine may recover on its own, while severe speed drop may cause the engine to stall, affecting the safe operation of mechanical equipment.

[0003] At present, the existing technology for real-time detection of engine speed drop has high limitations, cannot quantify the severity of speed drop, is not conducive to the analysis and comparison of the severity of speed drop of different mechanical equipment, is difficult to guide maintenance, and the accuracy and efficiency of engine speed drop severity evaluation are relatively low. Therefore, how to design an accurate and effective engine speed drop severity evaluation scheme has become a technical problem that needs to be solved urgently. Summary of the invention

[0004] To this end, the present invention provides an engine speed drop analysis and evaluation method and device to solve the defects of the prior art that the engine speed drop analysis and evaluation scheme has high limitations, resulting in poor accuracy and efficiency in evaluating the severity of the engine speed drop.

[0005] The present invention provides an engine speed drop analysis and evaluation method, comprising:

[0006] Obtain historical operating data of the engine;

[0007] Analyzing and processing the historical operating condition data within a preset time interval to determine a corresponding engine speed drop severity index;

[0008] Based on the engine speed drop severity index, an engine speed drop evaluation result is determined.

[0009] Furthermore, the analyzing and processing of the historical operating condition data within a preset time interval to determine the corresponding engine speed drop severity index includes:

[0010] Analyze and process the historical operating condition data within a preset time interval to determine the engine's speed drop duration, target speed, speed drop amplitude, speed drop load pressure and standard operating condition operation duration; wherein the speed drop duration is the cumulative duration corresponding to the engine speed drop; the target speed is the theoretical speed corresponding to the engine speed drop; the speed drop amplitude is the speed difference between the actual speed and the theoretical speed when the engine speed drops; the speed drop load pressure is the load pressure during the operation when the engine speed drops; the standard operating condition operation duration is the length of time the engine normally operates;

[0011] Determine a corresponding speed drop frequency index based on the speed drop duration and the standard working condition operation duration;

[0012] Determining a speed drop amplitude indicator based on the speed drop amplitude and a preset maximum speed drop amplitude;

[0013] The engine speed drop severity index is determined based on the speed drop frequency index, the speed drop amplitude index, the target speed, and the speed drop load pressure.

[0014] Further, based on the speed drop frequency index, the speed drop amplitude index, the target speed and the speed drop load pressure, determining the engine speed drop severity index specifically includes:

[0015] Determine a target correlation factor corresponding to the engine speed drop severity index based on the negative correlation between the target speed and the speed drop frequency index and the speed drop amplitude index, and the positive correlation between the speed drop load pressure and the speed drop frequency index and the speed drop amplitude index, respectively;

[0016] The engine speed drop severity index is determined according to the target related factors corresponding to the speed drop frequency index, the speed drop amplitude index and the engine speed drop severity index.

[0017] Furthermore, the historical operating condition data within a preset time interval is analyzed and processed to determine the engine's speed drop duration, target speed, speed drop amplitude, speed drop load pressure, and standard operating condition operation duration, specifically including:

[0018] Screen the collected original operation status data to determine the standard working condition operation data;

[0019] Based on the timestamp difference corresponding to the standard working condition operation data, the standard working condition operation duration is obtained;

[0020] The actual speed corresponding to the standard working condition operation data is compared with the theoretical speed. When the actual speed is lower than the threshold set by the theoretical speed, the current actual speed state is calibrated to determine the speed drop mark, and the corresponding speed difference is recorded;

[0021] The speed drop duration is obtained by accumulating the timestamp difference corresponding to the speed drop flag;

[0022] Determine the target speed based on the theoretical speed corresponding to the speed drop flag;

[0023] Determine the speed drop amplitude based on the speed difference corresponding to the speed drop sign;

[0024] The speed drop load pressure is determined based on the load pressure corresponding to the speed drop flag.

[0025] Furthermore, determining the engine speed drop evaluation result based on the engine speed drop severity index specifically includes: performing trend feature matching and threshold comparison analysis based on the engine speed drop severity index and a preset engine speed drop severity index sequence, and determining the engine speed drop evaluation result according to the trend feature matching and threshold comparison analysis results.

[0026] Further, the determining of the engine speed drop evaluation result based on the engine speed drop severity index specifically includes:

[0027] Obtaining an engine speed drop severity index of a single device within two preset time periods, and respectively determining the average values ​​of the engine speed drop severity index within the two preset time periods;

[0028] The mean values ​​of the engine speed drop severity indexes within the two preset time periods are compared to quantitatively analyze the speed drop characteristics and output corresponding speed drop evaluation results.

[0029] Further, the determining of the engine speed drop evaluation result based on the engine speed drop severity index specifically includes:

[0030] The engine speed drop severity index of at least two devices in the same time period is obtained, and the mean value of the speed drop severity index corresponding to each device of the at least two devices is determined respectively, and the target device that meets the preset speed drop severity condition is screened out based on the size of the mean value of the speed drop severity index, and the speed drop evaluation result of the engine corresponding to the target device is determined.

[0031] The present invention also provides an engine speed drop analysis and evaluation device, comprising:

[0032] A historical operating condition data acquisition unit, used to acquire historical operating condition data of the engine;

[0033] A speed drop index determination unit, used to analyze and process the historical operating condition data within a preset time interval to determine a corresponding engine speed drop severity index;

[0034] The speed drop analysis and evaluation unit is used to determine the engine speed drop evaluation result based on the engine speed drop severity index.

[0035] Furthermore, the speed drop index determination unit is specifically used to:

[0036] Analyze and process the historical operating condition data within a preset time interval to determine the engine's speed drop duration, target speed, speed drop amplitude, speed drop load pressure and standard operating condition operation duration; wherein the speed drop duration is the cumulative duration corresponding to the engine speed drop; the target speed is the theoretical speed corresponding to the engine speed drop; the speed drop amplitude is the speed difference between the actual speed and the theoretical speed when the engine speed drops; the speed drop load pressure is the load pressure during the operation when the engine speed drops; the standard operating condition operation duration is the length of time the engine normally operates;

[0037] Determine a corresponding speed drop frequency index based on the speed drop duration and the standard working condition operation duration;

[0038] Determining a speed drop amplitude indicator based on the speed drop amplitude and a preset maximum speed drop amplitude;

[0039] The engine speed drop severity index is determined based on the speed drop frequency index, the speed drop amplitude index, the target speed, and the speed drop load pressure.

[0040] Further, based on the speed drop frequency index, the speed drop amplitude index, the target speed and the speed drop load pressure, determining the engine speed drop severity index specifically includes:

[0041] Determine a target correlation factor corresponding to the engine speed drop severity index based on the negative correlation between the target speed and the speed drop frequency index and the speed drop amplitude index, and the positive correlation between the speed drop load pressure and the speed drop frequency index and the speed drop amplitude index, respectively;

[0042] The engine speed drop severity index is determined according to the target related factors corresponding to the speed drop frequency index, the speed drop amplitude index and the engine speed drop severity index.

[0043] Furthermore, the historical operating condition data within a preset time interval is analyzed and processed to determine the engine's speed drop duration, target speed, speed drop amplitude, speed drop load pressure, and standard operating condition operation duration, specifically including:

[0044] Screen the collected original operation status data to determine the standard working condition operation data;

[0045] Based on the timestamp difference corresponding to the standard working condition operation data, the standard working condition operation duration is obtained;

[0046] The actual speed corresponding to the standard working condition operation data is compared with the theoretical speed. When the actual speed is lower than the threshold set by the theoretical speed, the current actual speed state is calibrated to determine the speed drop mark, and the corresponding speed difference is recorded;

[0047] The speed drop duration is obtained by accumulating the timestamp difference corresponding to the speed drop flag;

[0048] Determine the target speed based on the theoretical speed corresponding to the speed drop flag;

[0049] Determine the speed drop amplitude based on the speed difference corresponding to the speed drop sign;

[0050] The speed drop load pressure is determined based on the load pressure corresponding to the speed drop flag.

[0051] Furthermore, the speed drop analysis and evaluation unit is specifically used to: perform trend feature matching and threshold comparison analysis based on the engine speed drop severity index and a preset engine speed drop severity index sequence, and determine the engine speed drop evaluation result according to the trend feature matching and threshold comparison analysis results.

[0052] Furthermore, the speed drop analysis and evaluation unit is specifically used for:

[0053] Obtaining an engine speed drop severity index of a single device within two preset time periods, and respectively determining the average values ​​of the engine speed drop severity index within the two preset time periods;

[0054] The mean values ​​of the engine speed drop severity indexes within the two preset time periods are compared to quantitatively analyze the speed drop characteristics and output corresponding speed drop evaluation results.

[0055] Furthermore, the speed drop analysis and evaluation unit is specifically used for:

[0056] The engine speed drop severity index of at least two devices in the same time period is obtained, and the mean value of the speed drop severity index corresponding to each device of the at least two devices is determined respectively, and the target device that meets the preset speed drop severity condition is screened out based on the size of the mean value of the speed drop severity index, and the speed drop evaluation result of the engine corresponding to the target device is determined.

[0057] The present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of any of the above-mentioned engine speed drop analysis and evaluation methods are implemented.

[0058] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of any of the above-mentioned engine speed drop analysis and evaluation methods are implemented.

[0059] The engine speed drop analysis and evaluation method provided by the present invention can effectively quantify the engine speed drop severity by selecting historical operating condition data at a preset time interval to determine the corresponding engine speed drop severity index, thereby improving the accuracy of the speed drop severity evaluation, facilitating the completion of the speed drop severity judgment, and improving the speed drop judgment efficiency, thereby achieving precise guidance and processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0061] Figure 1 It is a flow chart of the engine speed drop analysis and evaluation method provided by the present invention;

[0062] Figure 2 It is a complete flow chart of the engine speed drop analysis and evaluation method provided by the present invention;

[0063] Figure 3 It is a schematic diagram of a specific implementation process of the engine speed drop analysis and evaluation method provided by the present invention;

[0064] Figure 4 It is a schematic diagram of the change of the trend characteristics provided by the present invention;

[0065] Figure 5 is a schematic diagram comparing the severity of speed drops of different devices provided by the present invention;

[0066] Figure 6It is a structural schematic diagram of the engine speed drop analysis and evaluation device provided by the present invention;

[0067] Figure 7 It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0068] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0069] Based on the engine speed drop analysis and evaluation method of the present invention, the following embodiments are described in detail. Figure 1 As shown, it is a flow chart of the engine speed drop analysis and evaluation method provided by an embodiment of the present invention, and the specific implementation process includes the following steps:

[0070] Step 101: Obtain historical operating data of the engine.

[0071] In the embodiment of the present invention, it is first necessary to obtain the historical operating data of the engine, which includes the actual speed, theoretical speed, load pressure, original operating state and corresponding timestamp of the engine.

[0072] Step 102: Analyze and process the historical operating condition data within a preset time interval to determine a corresponding engine speed drop severity index.

[0073] like Figure 2 As shown, in an embodiment of the present invention, the engine speed drop severity index is calculated according to a fixed time interval by selecting historical operating condition data within a preset time interval and stored in a database. The engine speed drop severity evaluation index can be used for horizontal comparison of the speed drop degree of different mechanical equipment, and can also be used for comparison of different operating time periods of the same pump truck. For example, the engine speed drop severity index sequence of different equipment in the same time period is obtained from the database, and the speed drop severity of some equipment is determined by comparing the distribution of index values ​​of multiple equipment; or, the engine speed drop severity index sequence of a single equipment in two time periods is obtained, and the mean values ​​of the engine speed drop severity index in the two time periods are compared to analyze whether the equipment speed drop has improved; or, the current time and historical index sequence of a single equipment are obtained for comprehensive decision-making, and a decision result is given, and the subsequent processing operation is guided according to the decision result.

[0074] During the specific implementation of this step, the historical operating condition data within the preset time interval can be first analyzed and processed to determine the engine's speed drop duration, target speed, speed drop amplitude, speed drop load pressure and standard operating condition operation duration; wherein the speed drop duration is the cumulative time corresponding to the engine speed drop; the target speed is the theoretical speed corresponding to the engine speed drop; the speed drop amplitude is the speed difference between the actual speed and the theoretical speed when the engine speed drops; the speed drop load pressure is the load pressure during the operation process when the engine speed drops; the standard operating condition operation duration is the length of time the engine operates normally; based on the speed drop duration and the standard operating condition operation duration, the corresponding speed drop frequency index is determined; based on the speed drop amplitude and the preset maximum speed drop amplitude, the speed drop amplitude index is determined; based on the speed drop frequency index, the speed drop amplitude index, the target speed and the speed drop load pressure, the engine speed drop severity index is determined. Wherein, the engine speed drop severity index is determined based on the speed drop frequency index, the speed drop amplitude index, the target speed and the speed drop load pressure, and the corresponding specific implementation process includes: determining the target related factor corresponding to the engine speed drop severity index based on the negative correlation between the target speed and the speed drop frequency index and the speed drop amplitude index, and the positive correlation between the speed drop load pressure and the speed drop frequency index and the speed drop amplitude index; determining the engine speed drop severity index according to the speed drop frequency index, the speed drop amplitude index and the target related factor. It should be noted that in actual operation, pressure is a way to describe the load size, and the speed drop load pressure described in the present invention is the load pressure size during the operation process when the engine drops. For example, in a pump truck, the operation process is that the engine drives the hydraulics and the hydraulics drive the concrete pumping, so the load pressure size of the engine can be described by the hydraulic cylinder pressure. The standard working condition operation time can be obtained by normalizing the speed drop time, so the normal operation time length of the engine can be used, or the total operation time length of the engine can be used, such as the idle time length plus the operation time length. The target-related factors refer to influencing factors other than the speed drop frequency and the speed drop amplitude, including theoretical speed and load pressure, and are used to characterize the process in which the lower the theoretical speed, the higher the speed drop possibility, and the greater the load, the higher the speed drop possibility.

[0075] Among them, the historical operating condition data within the preset time interval is analyzed and processed to determine the engine's speed drop duration, target speed, speed drop amplitude, speed drop load pressure and standard operating condition operation duration. The corresponding specific implementation process includes: screening the collected original operating status data to determine the standard operating condition operation data; obtaining the standard operating condition operation duration based on the timestamp difference corresponding to the standard operating condition operation data; comparing the actual speed and the theoretical speed corresponding to the standard operating condition operation data, and when the actual speed is lower than the threshold set by the theoretical speed, performing speed drop calibration on the current actual speed state to determine the speed drop flag, and recording the corresponding speed difference; obtaining the speed drop duration based on the accumulation of the timestamp difference corresponding to the speed drop flag; determining the target speed based on the theoretical speed corresponding to the speed drop flag; determining the speed drop amplitude based on the speed difference corresponding to the speed drop flag; and determining the speed drop load pressure based on the load pressure corresponding to the speed drop flag. For example, in a specific implementation process, the target speed can be obtained by taking an average based on the theoretical speed; the target speed can be obtained by taking an average based on the speed difference between the actual speed and the theoretical speed; the speed drop load pressure can be obtained by taking an average based on the load pressure; the speed drop duration can be obtained by accumulating the time when the actual speed is lower than the theoretical speed; of course, the target speed, target speed, speed drop load pressure and speed drop duration can also be calculated by other methods, which are not specifically limited here.

[0076] like Figure 3 As shown, in the embodiment of the present invention, the complete implementation process of determining the engine speed drop severity index is as follows (1)-(5):

[0077] (1) The engine speed drop severity index is calculated using the historical operating condition data collected during the mechanical operation process. The historical operating condition data includes the actual speed (ra), theoretical speed (rt), operating load pressure (p), original operating state (s) and its corresponding timestamp (t) data:

[0078] Table 1 Example of historical operating data

[0079]

[0080] During the mechanical operation process, the theoretical speed has an upper limit, which is called the maximum theoretical speed (rtm). For example, the target chassis pump truck rtm is set to 1750r / min. Assume the set RT = [0, rtm], then rt∈RT; during the mechanical operation process, the load pressure has an upper limit, which is called the maximum load pressure (pm). For example, the chassis pump truck pm is set to 42MPa. Assume the set PM = [0, pm], then p∈PM.

[0081] (2) The engine speed drop severity index can be calculated according to a preset time interval. For example, historical operating data of a mechanical equipment operating for 1 hour, 1 day, 1 week, etc. is selected to calculate an index value corresponding to an engine speed drop severity index.

[0082] (3) Calculate the speed drop duration, target speed (i.e., speed drop amplitude), speed drop load pressure, and standard operating time (i.e., normal operating time): 3.1) Calculate the timestamp difference (dt) between the current timestamp and the previous timestamp based on the timestamp, and add the historical operating data; 3.2) Filter the data based on the operating status data, and only retain the corresponding operating data during the formal operation (i.e., standard operating data). Among them, the operating status data records the actions generated during the mechanical operation process, such as the operation process of the pump truck, including: no action, pumping, main cylinder jog, piston retraction, preheating, boom action, outrigger action, etc. Among them, the state of pumping represents the pumping operation of the pump truck, that is, the operating condition data obtained during pumping is used as the standard operating data. 3.3) The timestamp difference dt corresponding to the standard working condition operation data is accumulated to obtain the standard working condition operation time (tw); 3.4) The actual speed and theoretical speed corresponding to the standard working condition operation data are compared. When the actual speed is lower than the threshold set for the theoretical speed (the threshold setting is based on the actual application experience of different operating machinery and different types of engines, for example, the threshold corresponding to the target chassis pump truck is set to not less than 50r / min), it is calibrated as a speed drop (that is, the current actual speed state is calibrated for a speed drop to determine the speed drop sign), and the speed difference between the theoretical speed and the actual speed corresponding to the speed drop time point is recorded. 3.5) The speed drop duration (td) is obtained by accumulating the timestamp difference dt corresponding to the speed drop mark; 3.6) The target speed (rd) is obtained by taking the average value based on the theoretical speed corresponding to the speed drop mark; 3.7) The speed drop amplitude (ad) is obtained by taking the average value based on the speed difference corresponding to the speed drop mark; 3.8) The speed drop load pressure (pd) is obtained by taking the average value based on the load pressure corresponding to the speed drop mark; 3.9) The mean value (rta) of the theoretical speed corresponding to the speed drop mark and the mean value (pa) of the load pressure are calculated at the same time; obviously rta∈(0, rtm], pa∈(0, pm].

[0083] (4) Calculate the speed drop frequency index and the speed drop amplitude index: 4.1) The speed drop frequency index (fi) is the ratio of the speed drop duration to the standard working condition operation duration, that is, fi = td / tw; it should be noted that the speed drop frequency index is a normalized result and dimensionless, so as to facilitate the comparison between different mechanical equipment. 4.2) The speed drop amplitude index (ai) is the ratio of the speed drop amplitude and the maximum speed drop amplitude (am), that is, when ad<=am, ai=ad / am, when ad>am, ai=1; the setting of the maximum speed drop amplitude is based on the actual application experience of different operating machinery and different types of engines. For example, the threshold value corresponding to the chassis pump truck is set to 500r / min. In addition, it should be noted that the speed drop amplitude index is also a normalized result and dimensionless, so as to facilitate the comparison between different mechanical equipment.

[0084] (5) Calculate the speed drop severity index. 5.1) According to the application experience of different mechanical equipment and different types of engines, formulate the index weight [α, β], requiring α∈[0, 1], β∈[0, 1], and α+β=1; for example, the chassis pump truck pays more attention to the speed drop amplitude index, and the corresponding index weight is set to [0.3, 0.7]; 5.2) Calculate the target correlation factor (γ) corresponding to the engine speed drop severity index. Under the engine operating state (i.e., the original operating state), the lower the speed and the smaller the output power, the higher the speed drop possibility (speed drop frequency) and the larger the speed drop amplitude; the greater the load pressure, the higher the speed drop possibility (speed drop frequency) and the larger the speed drop amplitude; that is, the engine speed and the speed drop frequency index and the speed drop amplitude index are negatively correlated, while the load pressure and the speed drop frequency index and the speed drop amplitude index are positively correlated. Therefore, based on the negative correlation between the target speed and the speed drop frequency index and the speed drop amplitude index, and the positive correlation between the speed drop load pressure and the speed drop frequency index and the speed drop amplitude index, the target correlation factor γ corresponding to the engine speed drop severity index can be determined.

[0085] The target related factor corresponding to the engine speed drop severity index is characterized as follows:

[0086]

[0087] Among them, f(·) and g(·) represent continuous positive correlation functions; max(·) means taking the maximum value of the set, and the goals of f(rta) / max(f(RT)) and g(pa) / max(f(PM)) are dimensionless and normalized results with a value range of [0, 1]; N(·) represents the mapping relationship that converts the value in the value range [0, +∞) into a finite value range.

[0088] An example of the target correlation factor γ corresponding to the engine speed drop severity index is as follows:

[0089]

[0090] That is, f(x)=x, g(x)=x, N(x)=arctan(x)*2 / π+1, where N(·) maps [0, +∞) to [1, 2).

[0091] 5.3) Determine the engine speed drop severity index according to the target related factors corresponding to the speed drop frequency index, the speed drop amplitude index and the engine speed drop severity index. The engine speed drop severity index (si) is: si = (α×fi+β×ai)×γ.

[0092] Step 103: Based on the engine speed drop severity index, determine the engine speed drop evaluation result.

[0093] In the specific implementation process, trend feature matching and threshold comparison analysis can be performed based on the engine speed drop severity index and a preset engine speed drop severity index sequence, and the engine speed drop evaluation result is determined according to the trend feature matching and threshold comparison analysis results.

[0094] In the comprehensive decision-making process of the engine speed drop severity, historical operating condition data is used to calculate a sequence of engine speed drop severity indicators (si sequence) at a preset time interval. The comprehensive decision-making is completed by combining the trend feature analysis method and the threshold comparison method, so as to guide the subsequent processing operations based on the comprehensive decision-making speed drop evaluation result. Among them, the comprehensive decision-making process is as follows: 1) Let the si sequence be SI, and its length be n. First, perform a moving average with a window length of m1 on SI to obtain the sequence SIL (example: SIL(n) = (SI(n) + SI(n - 1) + … + SI(n - m1 + 1)) / m1, the same below); then perform a moving average with a window length of m2 on SIL to obtain the sequence SIS, where 0 < m2 < m1 < n; 2) If for k1 (k1 ≥ 2) consecutive points in the reverse order of the sequence, that is, i ∈ {n, n - 1, …, n - k1 + 1}, all have SIL(i) exceeding SIS(i), then it is considered that there is an upward trend; 3) In the reverse order of the sequence, if SI has an upward trend and SI(n) is not lower than the threshold, or SI has k2 (k2 ≥ 2) consecutive points not lower than the threshold, that is, i ∈ {n, n - 1, …, n - k2 + 1}, all have SI(i) not lower than the threshold, then it is determined that there is a serious speed drop phenomenon in the comprehensive decision-making speed drop evaluation result and needs to be processed. The formulation of the threshold is related to the aforementioned N(·) mapping relationship. Usually, this value is taken as not less than 0.5 times the supremum of the set mapped by N(·). For example, in the above 5.2, N(·) maps [0, +∞) to [1, 2), then the threshold here can be taken as not less than 1. For example, SI = {0.19, 0.16, 0.17, …} with a total of 49 data. First, perform a moving average with a window length of 10 on SI to obtain SIL, and then perform a moving average with a window length of 4 on SIL to obtain SIS, and the results are as Figure 4 shown. The SI sequence has an obvious upward trend, and the data at the back end of the SIL sequence is significantly larger than the corresponding points of the SIS sequence.

[0095] In addition, the engine speed drop evaluation result is determined based on the engine speed drop severity index, and the corresponding specific implementation process may also include: obtaining the engine speed drop severity index of a single device within two preset time periods, and determining the mean of the engine speed drop severity index within the two preset time periods; comparing the mean of the engine speed drop severity index within the two preset time periods to achieve quantitative analysis of the speed drop characteristics, and outputting the corresponding speed drop evaluation result. For example, in the process of analyzing and evaluating the impact of the modification of the parts of a certain equipment on the speed drop situation, the pump truck increases the transmission ratio of the transfer case driving gear and the driven gear, which generally increases the probability of speed drop. Then, the severity index in the same time period before and after the modification time point can be calculated, and the mean can be taken respectively, and the speed drop situation can be quantitatively analyzed by comparing the mean size. In addition, the specific implementation process of determining the engine speed drop evaluation result based on the engine speed drop severity index may also include: obtaining the engine speed drop severity index of at least two devices in the same time period, and respectively determining the mean speed drop severity index corresponding to each device in the at least two devices, and selecting the target device that meets the preset speed drop severity condition based on the mean speed drop severity index, and determining the engine speed drop evaluation result. Figure 5 As shown, the same time period is selected for different devices to calculate the severity index respectively, the average of the severity index of each device is calculated, and the devices with relatively serious speed drop are screened out according to the size of the average.

[0096] The engine speed drop analysis and evaluation method described in the embodiment of the present invention can effectively quantify the engine speed drop severity by selecting historical operating condition data at a preset time interval to determine the corresponding engine speed drop severity index. By quantifying the engine speed drop severity, it is convenient to realize the speed drop comparison analysis of different mechanical equipment and different models of engines; the speed and load pressure influencing factors are applied to the engine speed drop severity index, thereby improving the accuracy of the speed drop severity evaluation; at the same time, combined with the historical operating condition data, the trend feature analysis and threshold comparison method are introduced to complete the speed drop severity judgment, thereby improving the speed drop judgment efficiency and realizing accurate guidance processing.

[0097] Corresponding to the above-mentioned engine speed drop analysis and evaluation method, the present invention also provides an engine speed drop analysis and evaluation device. Since the embodiment of the device is similar to the above-mentioned method embodiment, the description is relatively simple. For relevant parts, please refer to the description of the above-mentioned method embodiment. The embodiment of the engine speed drop analysis and evaluation device described below is only illustrative. Please refer to Figure 6 As shown, it is a structural schematic diagram of an engine speed drop analysis and evaluation device provided by an embodiment of the present invention.

[0098] The engine speed drop analysis and evaluation device of the present invention specifically comprises:

[0099] A historical operating condition data acquisition unit 601 is used to acquire historical operating condition data of the engine;

[0100] A speed drop index determination unit 602 is used to analyze and process the historical operating condition data within a preset time interval to determine a corresponding engine speed drop severity index;

[0101] The speed drop analysis and evaluation unit 603 is used to determine the engine speed drop evaluation result based on the engine speed drop severity index.

[0102] Furthermore, the speed drop index determination unit is specifically used to:

[0103] Analyze and process the historical operating condition data within a preset time interval to determine the engine's speed drop duration, target speed, speed drop amplitude, speed drop load pressure, and standard operating condition operation duration; wherein the historical operating condition data includes the engine's actual speed, theoretical speed, load pressure, original operating state, and corresponding timestamp;

[0104] Determine a corresponding speed drop frequency index based on the speed drop duration and the standard working condition operation duration;

[0105] Determining a speed drop amplitude indicator based on the speed drop amplitude and a preset maximum speed drop amplitude;

[0106] The engine speed drop severity index is determined based on the speed drop frequency index, the speed drop amplitude index, the target speed, and the speed drop load pressure.

[0107] Further, based on the speed drop frequency index, the speed drop amplitude index, the target speed and the speed drop load pressure, determining the engine speed drop severity index specifically includes:

[0108] Determine a target correlation factor corresponding to the engine speed drop severity index based on the negative correlation between the target speed and the speed drop frequency index and the speed drop amplitude index, and the positive correlation between the speed drop load pressure and the speed drop frequency index and the speed drop amplitude index, respectively;

[0109] The engine speed drop severity index is determined according to the target related factors corresponding to the speed drop frequency index, the speed drop amplitude index and the engine speed drop severity index.

[0110] Furthermore, the historical operating condition data within a preset time interval is analyzed and processed to determine the engine's speed drop duration, target speed, speed drop amplitude, speed drop load pressure, and standard operating condition operation duration, specifically including:

[0111] Screen the collected original operation status data to determine the standard working condition operation data;

[0112] Based on the timestamp difference corresponding to the standard working condition operation data, the standard working condition operation duration is obtained;

[0113] The actual speed corresponding to the standard working condition operation data is compared with the theoretical speed. When the actual speed is lower than the threshold set by the theoretical speed, the current actual speed state is calibrated to determine the speed drop mark, and the corresponding speed difference is recorded;

[0114] The speed drop duration is obtained by accumulating the timestamp difference corresponding to the speed drop flag;

[0115] Determine the target speed based on the theoretical speed corresponding to the speed drop flag;

[0116] Determine the speed drop amplitude based on the speed difference corresponding to the speed drop sign;

[0117] The speed drop load pressure is determined based on the load pressure corresponding to the speed drop flag.

[0118] Furthermore, the speed drop analysis and evaluation unit is specifically used to: perform trend feature matching and threshold comparison analysis based on the engine speed drop severity index and a preset engine speed drop severity index sequence, and determine the engine speed drop evaluation result according to the trend feature matching and threshold comparison analysis results.

[0119] Furthermore, the speed drop analysis and evaluation unit is specifically used for:

[0120] Obtaining an engine speed drop severity index of a single device within two preset time periods, and respectively determining the average values ​​of the engine speed drop severity index within the two preset time periods;

[0121] The mean values ​​of the engine speed drop severity indexes within the two preset time periods are compared to quantitatively analyze the speed drop characteristics and output corresponding speed drop evaluation results.

[0122] Furthermore, the speed drop analysis and evaluation unit is specifically used for:

[0123] The engine speed drop severity index of at least two devices in the same time period is obtained, and the mean value of the speed drop severity index corresponding to each device in the at least two devices is determined respectively, and the target device that meets the preset speed drop severity condition is screened out based on the size of the mean value of the speed drop severity index to determine the engine speed drop evaluation result.

[0124] The engine speed drop analysis and evaluation device described in the embodiment of the present invention can effectively quantify the engine speed drop severity by selecting historical operating condition data at a preset time interval to determine the corresponding engine speed drop severity index, thereby improving the accuracy of the speed drop severity evaluation, facilitating the completion of the speed drop severity judgment, and improving the speed drop judgment efficiency, thereby achieving precise guidance and processing.

[0125] Corresponding to the engine speed drop analysis and evaluation method provided above, the present invention also provides an electronic device. Since the embodiment of the electronic device is similar to the embodiment of the method described above, the description is relatively simple. For the relevant parts, please refer to the description of the embodiment of the method described above. The electronic device described below is only for illustration. Figure 7 As shown, it is a schematic diagram of the physical structure of an electronic device disclosed in an embodiment of the present invention. The electronic device may include: a processor 701, a memory 702 and a communication bus 703, wherein the processor 701 and the memory 702 communicate with each other through the communication bus 703 and communicate with the outside through a communication interface 704. The processor 701 can call the logic instructions in the memory 702 to execute the engine speed drop analysis and evaluation method, which includes: obtaining historical operating condition data of the engine; analyzing and processing the historical operating condition data within a preset time interval to determine the corresponding engine speed drop severity index; based on the engine speed drop severity index, determining the engine speed drop evaluation result.

[0126] In addition, the logic instructions in the above-mentioned memory 702 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk.

[0127] On the other hand, the present invention also provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions. When the program instructions are executed by a computer, the computer can execute the engine speed drop analysis and evaluation method provided by the above-mentioned methods, and the method includes: obtaining historical operating condition data of the engine; analyzing and processing the historical operating condition data within a preset time interval to determine a corresponding engine speed drop severity index; and determining an engine speed drop evaluation result based on the engine speed drop severity index.

[0128] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, it is implemented to perform the above-mentioned engine speed drop analysis and evaluation methods, the method comprising: obtaining historical operating condition data of the engine; analyzing and processing the historical operating condition data within a preset time interval to determine a corresponding engine speed drop severity index; and determining an engine speed drop evaluation result based on the engine speed drop severity index.

[0129] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0130] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0131] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention 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 invention.

Claims

1. An engine speed drop analysis and evaluation method, characterized in that: include: Obtain historical operating data of the engine; Analyzing and processing the historical operating condition data within a preset time interval to determine a corresponding engine speed drop severity index; Determining an engine speed drop evaluation result based on the engine speed drop severity index; The analyzing and processing of the historical operating condition data within a preset time interval to determine the corresponding engine speed drop severity index includes: Analyze and process the historical operating condition data within a preset time interval to determine the engine's speed drop duration, target speed, speed drop amplitude, speed drop load pressure and standard operating condition operation duration; wherein the speed drop duration is the cumulative duration corresponding to the engine speed drop; the target speed is the theoretical speed corresponding to the engine speed drop; the speed drop amplitude is the speed difference between the actual speed and the theoretical speed when the engine speed drops; the speed drop load pressure is the load pressure during the operation when the engine speed drops; the standard operating condition operation duration is the length of time the engine normally operates; Determine a corresponding speed drop frequency index based on the speed drop duration and the standard working condition operation duration; Determining a speed drop amplitude indicator based on the speed drop amplitude and a preset maximum speed drop amplitude; Determining the engine speed drop severity index based on the speed drop frequency index, the speed drop amplitude index, the target speed, and the speed drop load pressure; Determining the engine speed drop severity index based on the speed drop frequency index, the speed drop amplitude index, the target speed, and the speed drop load pressure specifically includes: Determine a target correlation factor corresponding to the engine speed drop severity index based on the negative correlation between the target speed and the speed drop frequency index and the speed drop amplitude index, and the positive correlation between the speed drop load pressure and the speed drop frequency index and the speed drop amplitude index, respectively; The engine speed drop severity index is determined according to the speed drop frequency index, the speed drop amplitude index and the target related factor.

2. The engine speed drop analysis and evaluation method according to claim 1, characterized in that: The analyzing and processing of the historical operating condition data within a preset time interval to determine the engine's speed drop duration, target speed, speed drop amplitude, speed drop load pressure, and standard operating condition operation duration specifically includes: Screen the collected original operation status data to determine the standard working condition operation data; Based on the timestamp difference corresponding to the standard working condition operation data, the standard working condition operation duration is obtained; The actual speed corresponding to the standard working condition operation data is compared with the theoretical speed. When the actual speed is lower than the threshold set by the theoretical speed, the current actual speed state is calibrated to determine the speed drop mark, and the corresponding speed difference is recorded; The speed drop duration is obtained by accumulating the timestamp difference corresponding to the speed drop flag; Determine the target speed based on the theoretical speed corresponding to the speed drop flag; Determine the speed drop amplitude based on the speed difference corresponding to the speed drop sign; The speed drop load pressure is determined based on the load pressure corresponding to the speed drop flag.

3. The engine speed drop analysis and evaluation method according to claim 1, characterized in that: The determining of the engine speed drop evaluation result based on the engine speed drop severity index specifically includes: Based on the engine speed drop severity index and a preset engine speed drop severity index sequence, trend feature matching and threshold comparison analysis are performed, and the engine speed drop evaluation result is determined according to the trend feature matching and threshold comparison analysis results.

4. The engine speed drop analysis and evaluation method according to claim 1, characterized in that: The determining of the engine speed drop evaluation result based on the engine speed drop severity index specifically includes: Obtaining an engine speed drop severity index of a single device within two preset time periods, and respectively determining the average values ​​of the engine speed drop severity index within the two preset time periods; The mean values ​​of the engine speed drop severity indexes within the two preset time periods are compared to quantitatively analyze the speed drop characteristics and output corresponding speed drop evaluation results.

5. The engine speed drop analysis and evaluation method according to claim 1, characterized in that: The determining of the engine speed drop evaluation result based on the engine speed drop severity index specifically includes: The engine speed drop severity index of at least two devices in the same time period is obtained, and the mean value of the speed drop severity index corresponding to each device of the at least two devices is determined respectively, and the target device that meets the preset speed drop severity condition is screened out based on the size of the mean value of the speed drop severity index, and the speed drop evaluation result of the engine corresponding to the target device is determined.

6. An engine speed drop analysis and evaluation device, characterized in that: include: A historical operating condition data acquisition unit, used to acquire historical operating condition data of the engine; The speed drop index determination unit is used to analyze and process the historical operating condition data within a preset time interval to determine the corresponding engine speed drop severity index; specifically, the historical operating condition data within the preset time interval is analyzed and processed to determine the engine speed drop duration, target speed, speed drop amplitude, speed drop load pressure and standard operating condition operation duration; wherein the speed drop duration is the cumulative duration corresponding to the engine speed drop; the target speed is the theoretical speed corresponding to the engine speed drop; the speed drop amplitude is the speed difference between the actual speed and the theoretical speed when the engine speed drops; the speed drop load pressure is the load pressure during the operation process when the engine speed drops; the standard operating condition operation duration is the length of time the engine operates normally; Determine a corresponding speed drop frequency index based on the speed drop duration and the standard working condition operation duration; Determining a speed drop amplitude indicator based on the speed drop amplitude and a preset maximum speed drop amplitude; Determining the engine speed drop severity index based on the speed drop frequency index, the speed drop amplitude index, the target speed, and the speed drop load pressure; Determining the engine speed drop severity index based on the speed drop frequency index, the speed drop amplitude index, the target speed, and the speed drop load pressure specifically includes: Determine a target correlation factor corresponding to the engine speed drop severity index based on the negative correlation between the target speed and the speed drop frequency index and the speed drop amplitude index, and the positive correlation between the speed drop load pressure and the speed drop frequency index and the speed drop amplitude index, respectively; Determining the engine speed drop severity index according to the speed drop frequency index, the speed drop amplitude index and the target related factor; The speed drop analysis and evaluation unit is used to determine the engine speed drop evaluation result based on the engine speed drop severity index.

7. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the steps of the engine speed drop analysis and evaluation method as described in any one of claims 1 to 5 are implemented.

8. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the engine speed drop analysis and evaluation method as claimed in any one of claims 1 to 5 are implemented.

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