CN110657038B - A fuel injection control method for a diesel engine - Google Patents

Abstract

The invention discloses an oil injection control method of a diesel engine, which comprises the following steps: after the diesel engine is started, judging whether a signal of a crankshaft position sensor is normal or not; if not, judging whether the conditions that the injection release condition is met and the oil injector has no fault are met or not when the diesel engine is synchronous; if yes, calculating an oil injection advance angle in real time, calculating an angle interval between an oil injection position and the current camshaft signal effective edge according to the oil injection advance angle, finding a working condition point according to the rotating speed of the diesel engine, the oil injection advance angle and the oil injection quantity interpolation value of the diesel engine, converting the angle interval into an accumulated value of a plurality of crankshaft tooth periods according to a crankshaft tooth period array corresponding to the working condition point, and executing one-time oil injection operation according to the accumulated value. The method of the invention realizes that the calculation of the time interval between the oil injection position and the current effective edge is converted into the accumulation of the crankshaft tooth period, and the influence of the rotation speed fluctuation and the acceleration/deceleration on the oil injection position is eliminated.

Description

A fuel injection control method for a diesel engine

technical field

The invention relates to the technical field of engines, in particular to a fuel injection control method of a diesel engine.

Background technique

The fuel injection position is of great significance to the operation of the diesel engine, and can have a great impact on noise and emissions, as well as fuel economy. It is of great significance to ensure that the engine works at the precise fuel injection position. The crankshaft position sensor can be used to determine the position of the crankshaft, that is, the rotation angle of the crankshaft, and it can also be used to detect the engine speed, so it is also called a speed sensor. When the crankshaft position sensor fails, the speed and engine phase information can be obtained from the collected camshaft position sensor signal. For a diesel engine with an "n+1" camshaft sprocket (n represents the number of uniform teeth on the camshaft sprocket, and 1 means synchronizing teeth), after the engine phase is determined, if the crankshaft signal is lost or there is interference, the The crankshaft signal cannot generate an angle clock, so the angle information cannot be obtained from the crankshaft signal. At this time, the calculation method of the fuel injection position is:

According to the previous segment cycle, the cumulative acceleration of the angle clock in the next segment is predicted (the crankshaft segment angle is obtained by dividing the entire working cycle into equal angles, and the segment cycle represents the time it takes for the crankshaft to rotate through the segment angle). The angular interval between the effective edge (hereinafter referred to as the effective edge) and the corresponding cylinder TDC (compression top dead center) is fixed, and the injection advance angle is the angle relative to TDC. The angular interval between valid edges, and then the angular interval is converted into a time interval proportional to the segment period.

Collection of six-cylinder machines (“60-2” type crankshaft gear plate (58 physical teeth, 2 missing), “6+1” type camshaft gear plate, crankshaft rotates 2 times as a working cycle, each working cycle camshaft 1 turn) the tooth cycle from the start of the speed at 0 to the low idle speed of about 700rpm, and the corresponding speed is shown in Figure 1. The segment cycle at a stable speed, that is, the sum of the 20 crankshaft tooth cycles corresponding to the crankshaft rotating through 120°C A, is basically stable, as shown in Figure 2.

However, the tooth periods of the 20 crankshaft teeth contained in two adjacent segments under low idle speed stable conditions are not equal. As shown in Figure 3, the peak of the curve is the maximum point of the tooth period, indicating that the engine phase reaches the At the compression top dead center of the current cylinder, the trough of the curve is the minimum point of the tooth period, indicating that the diesel combustion work in the cylinder produces acceleration.

The precondition for converting the angular interval into the time interval in the prior art solution is that the crankshaft moves at a constant speed between the segment angles, and the angle clock also accumulates at a constant speed. However, even under stable operating conditions, the rotational speed of the diesel engine fluctuates. The period of fluctuation is the same as that of the diesel engine cylinders doing work: when there is a cylinder doing work, the crankshaft accelerates, and when there is no cylinder doing work, the crankshaft decelerates. Using the existing technical solution in the single camshaft mode, the estimated fuel injection position will deviate from the actual position. The magnitude of the deviation is related to factors such as the current engine speed, the fuel injection advance angle and the fuel injection quantity. The greater the engine acceleration/deceleration, the greater this deviation.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a fuel injection control method of a diesel engine. In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended to be an extensive review, nor is it intended to identify key/critical elements or delineate the scope of protection of these embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the detailed description that follows.

According to an aspect of the embodiments of the present invention, a fuel injection control method for a diesel engine is provided, comprising:

After the diesel engine is started, determine whether the crankshaft position sensor signal is normal;

If the signal of the crankshaft position sensor is abnormal, when the diesel engine is synchronized, it is determined whether the injection release condition is satisfied and the injector has no fault conditions; The advance angle calculates the angular interval between the fuel injection position and the effective edge of the current camshaft signal, and then finds the operating point according to the rotational speed of the diesel engine, the fuel injection advance angle and the fuel injection quantity of the diesel engine. The angular interval is converted into an accumulated value of a plurality of crankshaft tooth periods by the crankshaft tooth cycle array corresponding to the operating point, and a fuel injection operation is performed according to the accumulated value.

Further, the method also includes:

If the crankshaft position sensor signal is normal, after the synchronization of the diesel engine is completed, it is judged whether the two conditions that the injection release condition is satisfied and the injector is fault-free are satisfied at the same time; if so, an injection operation is performed.

Further, the method further includes: according to the current diesel engine speed, fuel injection advance angle and fuel injection quantity, dividing the entire driving cycle into several operating points, and recording each operating point in a complete crankshaft segment at each operating point. Data on the tooth cycle.

Further, the method further includes: storing the data of each tooth cycle after the diesel engine is stopped.

Further, the method further includes: if the two conditions that the injection release condition is satisfied and the injector is fault-free are not satisfied at the same time, judging whether the diesel engine is stopped, if not, turning to the judgment to satisfy the injection release release. condition and whether the two conditions that the injector is not faulty are met at the same time.

Further, the formula for converting the angular interval into the cumulative value of multiple crankshaft tooth cycles according to the crankshaft tooth cycle array corresponding to the operating point is:

Among them, phiInj represents the injection advance angle, mod represents the remainder operation, t _n represents the tooth period, n∈{1,2,…,[phiInj/6]}.

Further, the method further includes: if the injection release condition is satisfied and the condition that the injector is fault-free is not established, judging whether the diesel engine is stopped; if not, turning to the judgment that the injection release condition is satisfied and the injection Whether the condition for the oiler to be fault-free is established.

Further, the method further includes: if the crankshaft position sensor signal is abnormal, when the diesel engine is out of synchronization, ending the process of the method.

According to another aspect of the embodiments of the present invention, an electronic device is provided, including a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor executing the program, In order to realize the fuel injection control method of the diesel engine.

According to another aspect of the embodiments of the present invention, a non-transitory computer-readable storage medium is provided, on which a computer program is stored, and the program is executed by a processor to implement the fuel injection control method for a diesel engine.

Compared with the prior art, the technical solutions provided by the embodiments of the present invention may include the following beneficial effects:

In the fuel injection control method for a diesel engine provided by the embodiment of the present invention, the fuel injection advance angle is calculated in real time based on conditions such as the rotational speed of the diesel engine, the circulating fuel supply amount, etc., and the fuel injection position calculated according to the fuel injection advance angle is valid with the current camshaft signal. The angle interval along the edge, and then interpolate according to the three factors of the speed of the diesel engine, the fuel injection advance angle and the fuel injection amount of the diesel engine to find the operating point, according to the crankshaft tooth cycle corresponding to the operating point The array converts the angle interval into the cumulative value of multiple crankshaft tooth cycles, and executes a fuel injection operation according to the cumulative value, thus realizing the conversion of the calculation of the time interval between the fuel injection position and the current valid edge into the cumulative value of the crankshaft tooth cycle, eliminating the need for The influence of speed fluctuation and acceleration/deceleration on the fuel injection position is analyzed.

Other features and advantages of the invention will be set forth in the description which follows, and, in part, will become apparent from the description, or may be inferred or unambiguously determined from the description, or may be practiced by practice of the invention. example to understand. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description, claims, and drawings.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments described in the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

Fig. 1 is a corresponding rotational speed curve diagram when a six-cylinder engine of the prior art starts up; the abscissa represents time, and the unit is second; the ordinate represents the rotational speed, and the unit is rpm;

Fig. 2 is the corresponding segment cycle graph when the six-cylinder engine of the prior art starts; the abscissa represents time, and the unit is second; the ordinate represents the cycle count value;

Fig. 3 is the corresponding graph of the tooth cycle count value within the segment when the six-cylinder engine of the prior art starts up; the abscissa represents the time, and the unit is second; the ordinate represents the tooth cycle count value;

4 is a flowchart of a fuel injection control method for a diesel engine provided by an embodiment of the application;

Fig. 5 is the tooth cycle change curve diagram of an embodiment of the application; the abscissa represents time, and the unit is second; the ordinate represents the tooth cycle count value;

FIG. 6 is a comparison diagram of technical effects between an embodiment of the application and the prior art; the abscissa represents time, in seconds; the ordinate represents the value of the time interval T divided by the actual segment period.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It should also be understood that terms, such as those defined in a general dictionary, should be understood to have meanings consistent with their meanings in the context of the prior art and, unless specifically defined as herein, should not be interpreted in idealistic or overly formal meaning to explain.

As shown in FIG. 4 , an embodiment of the present application provides a fuel injection control method for a diesel engine, including:

S1. Diesel engine starts;

S2. Determine whether the crankshaft sensor signal is normal; if it is normal, turn to S3; otherwise, turn to S4;

S3, complete diesel engine synchronization, turn to S9;

S4, determine whether the diesel engine is synchronized; if so, turn to S5; otherwise, turn to S8;

S5. Determine whether the injection release conditions are met and the injector is not faulty; if so, go to S6; otherwise, go to S8;

S6. Calculate the fuel injection advance angle in real time based on conditions such as the rotational speed of the diesel engine and the circulating fuel supply amount, calculate the angular interval between the fuel injection position and the valid edge of the current camshaft signal according to the fuel injection advance angle, and then calculate the angular interval between the fuel injection position and the effective edge of the current camshaft signal according to the fuel injection advance angle. The three factors of rotation speed, the fuel injection advance angle and the fuel injection amount of the diesel engine are interpolated to find the operating point, and the angle interval is converted into a plurality of crankshaft tooth periods according to the crankshaft tooth period array corresponding to the operating point. accumulated value;

S7. Perform a fuel injection operation according to the accumulated value;

S8, determine whether the engine is stopped; if so, turn to S14; otherwise, turn to S5;

S9, determine whether the injection release conditions are met and the injector is not faulty; if so, go to S10; otherwise, go to S12;

S10, perform a fuel injection operation;

S11. According to the current engine speed, fuel injection advance angle and fuel injection quantity, divide the entire driving cycle into several operating points, and record the data of each tooth cycle in a complete crankshaft segment at each operating point;

S12, determine whether the engine is stopped; if so, go to S13; otherwise, go to S9;

S13. Store the data of each tooth cycle in the non-volatile storage area;

S14. End.

Another embodiment of the present application provides a fuel injection control method for a diesel engine, including:

After the diesel engine is started, determine whether the crankshaft position sensor signal is normal;

If the signal of the crankshaft position sensor is abnormal, when the diesel engine is synchronized, it is judged whether the injection release condition is satisfied and the injector is not faulty. The fuel injection advance angle is calculated in real time according to the conditions, and the angular interval between the fuel injection position and the effective edge of the current camshaft signal is calculated according to the fuel injection advance angle, and then according to the speed of the diesel engine, the fuel injection advance angle and the diesel engine The three factors of the fuel injection amount are interpolated to find the operating point, and the angle interval is converted into the accumulated value of multiple crankshaft tooth periods according to the crankshaft tooth cycle array corresponding to the operating point, and a fuel injection operation is performed according to the accumulated value. .

In some embodiments, the fuel injection control method of the diesel engine further includes:

If the crankshaft position sensor signal is normal, after the synchronization of the diesel engine is completed, it is judged whether the two conditions that the injection release condition is satisfied and the injector is fault-free are satisfied at the same time; if so, an injection operation is performed.

In some embodiments, the fuel injection control method of the diesel engine further comprises: dividing the entire driving cycle into several operating points according to the current diesel engine speed, the fuel injection advance angle and the fuel injection amount, and recording each operating condition Data for each tooth cycle within a complete crankshaft segment at the point.

In some embodiments, the fuel injection control method of the diesel engine further comprises: storing the data of each tooth period after the diesel engine is stopped. After the data of each tooth cycle is stored, the data can be recalled at any time later.

In some embodiments, the fuel injection control method of the diesel engine further includes: if the two conditions of satisfying the injection release condition and the injector being fault-free are not met at the same time, judging whether the diesel engine is stopped, if If not, turn to the judgment whether the two conditions that the injection release condition is satisfied and the injector is not faulty are satisfied at the same time.

Further, the formula for converting the angular interval into the cumulative value of multiple crankshaft tooth cycles according to the crankshaft tooth cycle array corresponding to the operating point is:

Among them, phiInj represents the injection advance angle, mod represents the remainder operation, t _n represents the tooth period, n∈{1,2,…,[phiInj/6]}.

In some embodiments, the fuel injection control method of the diesel engine further includes: if the injection release condition is satisfied and the condition that the injector is not faulty is not satisfied, judging whether the diesel engine is stopped; if not, then Turn to the judging whether the injection release condition is satisfied and the injector is not faulty.

In some embodiments, the fuel injection control method of the diesel engine further includes: if the signal of the crankshaft position sensor is abnormal, when the diesel engine is out of synchronization, ending the flow of the method.

This embodiment also provides an electronic device, including a memory, a processor, and a computer program stored on the memory and running on the processor, where the processor executes the program to realize the diesel fuel The fuel injection control method of the engine.

This embodiment also provides a non-transitory computer-readable storage medium, on which a computer program is stored, and the program is executed by a processor to implement the fuel injection control method for a diesel engine.

Another embodiment of the present application provides a fuel injection control method for a diesel engine, comprising:

S10. After the diesel engine is started, the electronic control unit (ECU) determines whether the crankshaft position sensor signal is normal;

S20. If the signal of the crankshaft position sensor is normal, after the synchronization of the diesel engine is completed, a fuel injection operation is performed when the injection release conditions are met and the injector is not faulty, and then according to the information of the current engine speed, fuel injection advance angle and fuel injection quantity Data, divide the entire driving cycle into several operating points, record the data of each tooth cycle t _n (n: 1~20) in a complete crankshaft segment at each operating point, and store the data in the non-stop after the engine is stopped. In the volatile storage area; wherein, the segment represents the tooth period of the uniform teeth of the camshaft; the satisfaction of the injection release condition may include receiving a signal from an operating device that controls the engine power (thrust) to increase the engine power;

S30. If the crankshaft position sensor signal is abnormal, enter the single camshaft mode;

The electronic control unit (ECU) obtains the current speed data of the engine according to the camshaft signal collected by the camshaft position sensor;

When the diesel engine is synchronized, the injection release conditions are met, and the injector has no fault, the fuel injection advance angle is calculated in real time based on the speed of the diesel engine, the circulating fuel supply and other conditions, and the fuel injection position and the current cam are calculated according to the fuel injection advance angle. The angle interval of the effective edge of the shaft signal, and then interpolate to find the operating point according to the three factors of the rotational speed of the diesel engine, the fuel injection advance angle and the fuel injection amount of the diesel engine. The crankshaft tooth cycle array converts the angular interval into a cumulative value of multiple crankshaft tooth cycles, and then performs an injection operation.

In some embodiments, in the mode in which the signals of the crankshaft position sensor and the camshaft position sensor are normal, after the diesel engine synchronization is completed, the injection operation is performed when the injection release condition is satisfied and the injector is not faulty, according to the current engine speed. , fuel injection advance angle and fuel injection quantity, divide the whole driving cycle into several operating points, and record each tooth period t _n (n: 1～20) in a complete crankshaft segment at each operating point ) to save the data;

When the crankshaft position sensor signal is unavailable (such as signal loss or interference), enter the single camshaft mode, according to the current engine speed, fuel injection advance angle and fuel injection amount, find the corresponding operating point by interpolation, according to the operating conditions The crankshaft tooth period array corresponding to the point converts the angular interval to the accumulated value T of multiple crankshaft tooth periods:

Among them, mod represents the operation of taking the remainder; (phiInj mod 6) is the remainder after dividing the fuel injection advance angle phiInj by 6;

When the engine is accelerated from 200rpm to about 600rpm, the tooth cycle change curve is shown in Figure 5. Figure 5 contains 160 teeth, corresponding to 8 segments. It is assumed that the angle of the set injection position relative to the current effective edge is 1/2 of the segment angle, that is, the angular interval between the injection position and the current effective edge is 60°C A, which is also the angle corresponding to the crankshaft turning 10 teeth.

Using the existing technology, the time interval between the injection position and the current effective edge is 1/2 of the previous segment period; using the technical solution of this embodiment, after calculating the injection parameters, find the corresponding operating point, and the operating point The first 10 of the corresponding 20 crankshaft tooth cycles are added and summed as the time interval between the injection position and the current valid edge. The position of the injection angle in the current segment is expressed by dividing the calculated time interval by the actual segment period. The result obtained by using the technical solution of this embodiment is basically about 0.5, that is, the position of 1/2 of the segment angle, while the result obtained by using the existing technology is obviously biased, and the fuel injection position lags during the acceleration process, as shown in Figure 6. Show. It can be seen that the use of the technical solution of this embodiment can significantly improve the accuracy of the fuel injection position in the single camshaft mode, and improve the power and emission performance of the engine.

In the fuel injection control method for a diesel engine provided by the embodiment of the present invention, the fuel injection advance angle is calculated in real time based on conditions such as the rotational speed of the diesel engine, the circulating fuel supply amount, etc., and the fuel injection position calculated according to the fuel injection advance angle is valid with the current camshaft signal. The angle interval along the edge, and then interpolate according to the three factors of the speed of the diesel engine, the fuel injection advance angle and the fuel injection amount of the diesel engine to find the operating point, according to the crankshaft tooth cycle corresponding to the operating point The array converts the angle interval into the cumulative value of multiple crankshaft tooth cycles, and executes a fuel injection operation according to the cumulative value, thus realizing the conversion of the calculation of the time interval between the fuel injection position and the current valid edge into the cumulative value of the crankshaft tooth cycle, eliminating the need for The influence of speed fluctuation and acceleration/deceleration on the fuel injection position is analyzed.

It should be noted:

The term "module" is not intended to be limited to a particular physical form. Depending on the specific application, a module may be implemented in hardware, firmware, software, and/or a combination thereof. Furthermore, different modules can share common components or even be implemented by the same components. There may or may not be clear boundaries between different modules.

The algorithms and displays provided herein are not inherently related to any particular computer, virtual appliance, or other device. Various general-purpose devices can also be used with the teachings based on this. The structure required to construct such a device is apparent from the above description. Furthermore, the present invention is not directed to any particular programming language. It is to be understood that various programming languages may be used to implement the inventions described herein, and that the descriptions of specific languages above are intended to disclose the best mode for carrying out the invention.

In the description provided herein, numerous specific details are set forth. It will be understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

Similarly, it is to be understood that in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together into a single embodiment, figure, or its description. This disclosure, however, should not be construed as reflecting an intention that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the Detailed Description are hereby expressly incorporated into this Detailed Description, with each claim standing on its own as a separate embodiment of this invention.

Those skilled in the art will understand that the modules in the device in the embodiment can be adaptively changed and arranged in one or more devices different from the embodiment. The modules or units or components in the embodiments may be combined into one module or unit or component, and further they may be divided into multiple sub-modules or sub-units or sub-assemblies. All features disclosed in this specification (including accompanying claims, abstract and drawings) and any method so disclosed may be employed in any combination, unless at least some of such features and/or procedures or elements are mutually exclusive. All processes or units of equipment are combined. Each feature disclosed in this specification (including accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.

Furthermore, those skilled in the art will appreciate that although some of the embodiments described herein include certain features, but not others, included in other embodiments, that combinations of features of different embodiments are intended to be within the scope of the invention within and form different embodiments. For example, in the following claims, any of the claimed embodiments may be used in any combination.

Various component embodiments of the present invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art should understand that a microprocessor or a digital signal processor (DSP) may be used in practice to implement some or all functions of some or all components in the apparatus for creating a virtual machine according to the embodiment of the present invention. The present invention can also be implemented as apparatus or apparatus programs (eg, computer programs and computer program products) for performing part or all of the methods described herein. Such a program implementing the present invention may be stored on a computer-readable medium, or may be in the form of one or more signals. Such signals may be downloaded from Internet sites, or provided on carrier signals, or in any other form.

It should be noted that the above-described embodiments illustrate rather than limit the invention, and that alternative embodiments may be devised by those skilled in the art without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention can be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, and third, etc. do not denote any order. These words can be interpreted as names.

It should be understood that although the various steps in the flowchart of the accompanying drawings are sequentially shown in the order indicated by the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless explicitly stated herein, the execution of these steps is not strictly limited to the order and may be performed in other orders. Moreover, at least a part of the steps in the flowchart of the accompanying drawings may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but may be executed at different times, and the execution sequence is also It does not have to be performed sequentially, but may be performed alternately or alternately with other steps or at least a portion of sub-steps or stages of other steps.

The above-mentioned embodiments only represent the embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as limiting the scope of the patent of the present invention. It should be pointed out that for those skilled in the art, without departing from the concept of the present invention, several modifications and improvements can be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the appended claims.

Claims (9)

1. A fuel injection control method of a diesel engine, characterized by comprising:

after the diesel engine is started, judging whether a signal of a crankshaft position sensor is normal or not;

if the signal of the crankshaft position sensor is abnormal, judging whether the conditions of injection release are met and the condition that the oil injector has no fault is met or not when the diesel engine is synchronous; if yes, calculating an oil injection advance angle in real time, calculating an angle interval between an oil injection position and the current camshaft signal effective edge according to the oil injection advance angle, finding a working condition point according to the rotating speed of the diesel engine, the oil injection advance angle and the oil injection quantity interpolation value of the diesel engine, converting the angle interval between the oil injection position and the current camshaft signal effective edge into an accumulated value of a plurality of crankshaft tooth periods according to a crankshaft tooth period array corresponding to the working condition point, and executing one-time oil injection operation according to the accumulated value.

2. The method of claim 1, further comprising:

if the signals of the crankshaft position sensor are normal, after the diesel engine is synchronously finished, judging whether two conditions of meeting the injection release condition and having no fault of an oil injector are simultaneously met; if yes, one fuel injection operation is executed.

3. The method of claim 2, further comprising: dividing the whole driving cycle into a plurality of working condition points according to the current rotation speed, the fuel injection advance angle and the fuel injection quantity of the diesel engine, and recording the data of each tooth period in a complete crankshaft segment at each working condition point.

4. The method of claim 3, further comprising: the data for each tooth cycle is stored after the diesel engine is shut down.

5. The method of claim 2, further comprising: and if the two conditions of meeting the injection release condition and having no fault of the oil injector are not simultaneously met, judging whether the diesel engine is stopped, and if not, turning to the step of judging whether the two conditions of meeting the injection release condition and having no fault of the oil injector are simultaneously met.

6. The method of claim 1, further comprising: if the injection release condition is met and the condition that the oil injector has no fault is not met, judging whether the diesel engine is stopped; and if the engine is not stopped, turning to the condition whether the conditions for judging whether the injection release conditions are met and the oil injector has no fault are met.

7. The method of claim 1, further comprising: if the crankshaft position sensor signal is not normal, the process of the method is ended when the diesel engine is out of synchronization.

8. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor executing the program to implement the method of any one of claims 1-7.

9. A non-transitory computer readable storage medium having stored thereon a computer program, characterized in that the program is executed by a processor to implement the method according to any one of claims 1-7.

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