WO2022142937A1 - Method and apparatus for positioning leaking cylinder in engine, and oscilloscope - Google Patents

Abstract

A method and apparatus (300) for positioning a leaking cylinder in an engine (60), and an oscilloscope (40). The method comprises: determining a calibration cylinder and a physical location of the calibration cylinder; acquiring a waveform of an output voltage of the engine power supply (70) and a waveform of a firing signal of the calibration cylinder; identifying a first preset waveband in the waveform of the firing signal, and determining a waveband time corresponding to the first preset waveband; identifying second preset wavebands in the waveform of the output voltage, classifying the second preset wavebands, and determining a cylinder identifier corresponding to each type of the second preset wavebands; sorting the cylinder identifiers to generate a cylinder identifier sequence, and determining a first sequence position and a second sequence position in the cylinder identifier sequence; and determining a physical location of the leaking cylinder in the engine (60) according to a preset firing sequence of multiple cylinders (1, 2, 3, 4), the first sequence position, the second sequence position, and the physical location of the calibration cylinder in the engine (60).

Description

Locating method, device and oscilloscope for leaking cylinder of engine

This application claims the priority of the Chinese patent application filed on December 30, 2020 with the application number 202011619913.3 and the application title "Method, Apparatus and Oscilloscope for Locating Leaky Cylinders of Engines", the entire contents of which are incorporated by reference in in this application.

technical field

The application relates to the technical field of engine cylinders, and in particular to a method, device and oscilloscope for locating a leaking cylinder of an engine.

Background technique

The engine is the component that provides power during the driving of the car, and generally includes multiple cylinders. Leakage occurs when the engine cylinder is worn, which affects the cylinder work.

During the maintenance of the engine, it is necessary to overhaul the leaking cylinder to avoid the leaking cylinder from affecting the normal operation of the engine. In the related art, the cylinder pressure is measured by a cylinder pressure gauge to determine whether there is leakage in the cylinder. When measuring cylinder pressure with a cylinder pressure gauge, each cylinder of the engine is generally measured in turn to determine which cylinder in the engine is leaking. However, in the process of implementing the present invention, the inventor found that when the cylinder pressure was measured by using a cylinder pressure gauge, the leaking cylinder could not be quickly located, and the efficiency of the locating process of the leaking cylinder was low.

SUMMARY OF THE INVENTION

In view of the above problems, embodiments of the present invention provide a method, device and oscilloscope for locating a leaking cylinder of an engine, which are used to solve the problem of low efficiency in the process of locating a leaking cylinder in the prior art.

According to an aspect of the embodiments of the present invention, a method for locating a leaking cylinder of an engine is provided, the engine includes a plurality of cylinders, and the method includes:

determining a calibration cylinder of the plurality of cylinders and a physical location of the calibration cylinder in the engine;

collecting the waveform of the output voltage of the power supply of the engine and the waveform of the ignition signal of the calibration cylinder;

Identifying a first preset band in the waveform of the ignition signal, and determining a band time corresponding to the first preset band;

Identifying a second preset waveband in the waveform of the output voltage, classifying the second preset waveband, and determining a cylinder identifier corresponding to each type of the second preset waveband;

Sort the cylinder identifiers according to the firing order of the cylinders corresponding to the cylinder identifiers to generate a cylinder identifier sequence, and determine the position of the cylinder identifier corresponding to the band time in the cylinder identifier sequence as the first sequence position ;

Determine the cylinder identification corresponding to the leaking cylinder, and determine the position of the cylinder identification corresponding to the leaking cylinder in the cylinder identification sequence as the second sequence position;

The physical location of the leaking cylinder in the engine is determined based on the preset firing order of the plurality of cylinders, the first sequence position, the second sequence position, and the physical position of the calibration cylinder in the engine position, wherein the preset firing order is a firing order identified by the physical positions of the plurality of cylinders.

In an optional manner, the first preset band is a peak in the waveform of the ignition signal, and the second preset band is a peak in the waveform of the output voltage;

The determining the position of the cylinder identifier corresponding to the band time in the cylinder identifier sequence as the first sequence position includes:

In the waveform of the output voltage, the second preset band corresponding to the peak coordinate with the smallest time difference with the band time is determined as a matching band;

determining the cylinder identifier corresponding to the matching band as the cylinder identifier corresponding to the band time;

The position of the cylinder identification corresponding to the band time in the cylinder identification sequence is determined as the first sequence position.

In an optional manner, the determining the cylinder identifier corresponding to the leaking cylinder includes:

Calculate the relative pressure of the cylinder corresponding to each type of the second preset band by using a preset relative pressure algorithm;

determining the second preset band category corresponding to the minimum value of the relative pressure as the leakage band category;

The cylinder identifier corresponding to the leakage band category is determined as the cylinder identifier corresponding to the leaking cylinder.

In an optional manner, the determination is based on a preset firing sequence of the plurality of cylinders, the first sequence position, the second sequence position, and the physical position of the calibration cylinder in the engine The physical location of the leaking cylinder in the engine includes:

A possible ignition sequence is determined according to the preset ignition sequence of the plurality of cylinders, the possible ignition sequence is a cylinder ignition sequence based on the preset ignition sequence, and the possible ignition sequence includes multiple types;

filtering out an actual firing sequence from the possible firing sequences according to the first sequence position and the physical position of the calibration cylinder in the engine;

Based on the second sequence position and the actual firing sequence, the physical position of the leaking cylinder in the engine is determined.

In an optional manner, the classifying the second preset frequency band and determining the cylinder identifier corresponding to each type of the second preset frequency band includes:

determining the ignition cycle of the engine according to the number of cylinders of the engine;

classifying the second preset frequency bands according to the ignition period and the number of cylinders, wherein each type of the second preset frequency bands corresponds to different cylinders of the engine;

Determine the cylinder identifier corresponding to each type of the second preset frequency band.

In an optional manner, before identifying the first preset waveband in the waveform of the ignition signal, the method includes:

extracting a preset area of the waveform of the ignition signal;

The first preset frequency band in the waveform of the identified ignition signal includes:

In the preset area, a first preset band in the waveform of the ignition signal is identified.

In an optional manner, before the extraction of the preset region of the waveform of the ignition signal, the method includes:

Starting from the starting position of the waveform of the ignition signal, remove the waveform within the preset time range;

A low-pass filtering process is performed on the waveform of the ignition signal after eliminating the waveform within the preset time range.

According to another aspect of the embodiments of the present invention, a device for locating a leaking cylinder of an engine is provided, the engine includes a plurality of cylinders, and the device includes:

a first determination module, configured to determine a calibration cylinder in the plurality of cylinders and a physical position of the calibration cylinder in the engine;

an acquisition module for acquiring the waveform of the output voltage of the power supply of the engine and the waveform of the ignition signal of the calibration cylinder;

a second determining module, configured to identify a first preset band in the waveform of the ignition signal, and determine a band time corresponding to the first preset band;

A third determination module, configured to identify a second preset band in the waveform of the output voltage, classify the second preset band, and determine the cylinder identifier corresponding to each type of the second preset band ;

The fourth determination module is used to sort the cylinder identifiers according to the firing order of the cylinders corresponding to the cylinder identifiers to generate a cylinder identifier sequence, and identify the cylinder corresponding to the band time in the cylinder identifier sequence. The position is determined to be the first sequence position;

a fifth determination module, configured to determine the cylinder identifier corresponding to the leaking cylinder, and determine the position of the cylinder identifier corresponding to the leaking cylinder in the cylinder identifier sequence as the second sequence position;

a sixth determination module, configured to determine the leaking cylinder according to the preset firing order of the plurality of cylinders, the first sequence position, the second sequence position, and the physical position of the calibration cylinder in the engine A physical location in the engine, wherein the preset firing order is a firing order identified by the physical locations of the plurality of cylinders.

According to another aspect of the embodiments of the present invention, an oscilloscope is provided, including: a processor, a memory, a communication interface, and a communication bus, and the processor, the memory, and the communication interface communicate with each other through the communication bus. Communication;

The memory is used for storing at least one executable instruction, and the executable instruction enables the processor to execute the operations of the above-mentioned method for locating a leaking cylinder of an engine.

According to yet another aspect of the embodiments of the present invention, a computer-readable storage medium is provided, where at least one executable instruction is stored in the storage medium, and when the executable instruction is executed on a computing device, the computing device executes the above Operation of the leaking cylinder locating method of the engine.

The embodiment of the present invention can identify the first preset band and the second preset band by collecting the waveform of the output voltage of the power supply of the engine and the waveform of the ignition signal of the calibration cylinder; the band time can be determined according to the first preset band, Classifying the second preset frequency bands can determine the cylinder identifiers corresponding to each type of second preset frequency bands; sorting the cylinder identifiers according to the firing order of the cylinders corresponding to the cylinder identifiers can generate a cylinder identifier sequence, and further can determine the first Sequence position and second sequence position; the physical position of the leaking cylinder in the engine can be determined according to the preset firing order of the plurality of cylinders, the first sequence position, the second sequence position and the physical position of the calibration cylinder in the engine. In the above manner, rapid positioning of the leaking cylinder of the engine can be achieved.

The above description is only an overview of the technical solutions of the embodiments of the present invention. In order to understand the technical means of the embodiments of the present invention more clearly, it can be implemented according to the contents of the description, and in order to make the above and other purposes, features and The advantages can be more clearly understood, and the following specific embodiments of the present invention are given.

Description of drawings

The drawings are only used to illustrate the embodiments and are not considered to be limiting of the present invention. Also, the same components are denoted by the same reference numerals throughout the drawings. In the attached image:

FIG. 1 shows a schematic structural diagram of an automobile diagnostic device provided by an embodiment of the present invention;

2 shows a schematic structural diagram of an oscilloscope provided by an embodiment of the present invention;

3 shows a schematic flowchart of a method for locating a leaking cylinder of an engine provided by an embodiment of the present invention;

FIG. 4(a) and FIG. 4(b) are schematic diagrams showing the waveform of the output voltage and the waveform of the ignition signal provided by the embodiment of the present invention;

FIG. 5 shows a schematic structural diagram of a leaking cylinder positioning device of an engine provided by an embodiment of the present invention.

Detailed ways

Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein.

1 shows a schematic structural diagram of an automobile diagnostic apparatus according to an embodiment of the present invention. The automobile diagnostic apparatus is used for diagnosing leaking cylinders in an engine, and a leaking cylinder in an engine is a cylinder in the engine that produces air pressure leakage due to wear. The specific embodiments of the present invention do not limit the specific implementation of the vehicle diagnostic equipment.

As shown in FIG. 1 , the automotive diagnostic equipment includes an oscilloscope 40 and a mobile terminal 50 , and the oscilloscope 40 and the mobile terminal 50 communicate via wifi or USB. The oscilloscope 40 includes an A channel, a B channel, a C channel and a D channel, and the A channel, the B channel, the C channel and the D channel are channels for the oscilloscope 40 to acquire signals. The mobile terminal 50 may be, for example, an android terminal, and a user can issue a collection command on the android terminal. After the android terminal establishes communication with the oscilloscope 40 , the oscilloscope 40 performs signal collection and signal analysis. As shown in FIG. 1 , the engine power supply 70 is the power supply when the engine 60 performs power. The engine power supply 70 includes a positive terminal 71 and a negative terminal 72 . The engine 60 includes cylinder 1, cylinder 2, cylinder 3 and cylinder 4, and cylinder 1, cylinder 2, cylinder 3 and cylinder 4 perform work in turn.

The working principle of the vehicle diagnostic apparatus of the embodiment of the present invention is to locate the position of the leaking cylinder of the engine 60 in the engine according to the waveform of the output voltage of the engine power supply 70 and the waveform of the ignition signal of any cylinder of the engine 60 . When the automotive diagnostic equipment is working, the A channel of the oscilloscope 40 is connected to the positive terminal 71 and the negative terminal 72 of the engine power supply 70 respectively through the test lead, so as to collect the waveform of the output voltage of the engine power supply 70. Further, the test lead One end is connected to the A channel, and the other end includes a red alligator clip and a black alligator clip, the red alligator clip is connected to the positive terminal 71 , and the black alligator clip is connected to the negative terminal 72 . The B channel of the oscilloscope 40 is connected to the No. 2 cylinder of the engine 60 through a test lead, which is used to collect the waveform of the ignition signal of the No. 2 cylinder. Further, one end of the test lead is connected to the B channel, and the other end is inserted into the No. 2 through a probe. At the ignition wire of the No. cylinder, the waveform of the ignition signal of the No. 2 cylinder is collected.

The following describes the implementation process of locating the faulty cylinder by the automobile diagnostic apparatus according to the embodiment of the present invention. Connect the A channel of the oscilloscope 40 to the positive and negative poles of the engine power supply 70, and connect the B channel to the ignition wire of any cylinder of the engine 60; select the number of cylinders included in the engine 60 on the operation interface of the mobile terminal 50, and further select the current The preset ignition sequence corresponding to the model. The preset ignition sequence is the ignition sequence of the cylinders of the current model. For example, if the current model contains 4 cylinders, the preset ignition sequence is 1/3/4/2. 5 cylinders, the preset ignition sequence is 1/2/4/5/3. If the current model contains 6 cylinders, the preset ignition sequence is 1/5/3/6/2/4. 2, 3, 4, 5 and 6 respectively represent the No. 1 cylinder, No. 2 cylinder, No. 3 cylinder, No. 4 cylinder, No. 5 cylinder and No. 6 cylinder of the engine; if the preset ignition sequence corresponding to the current model is not selected, Then the mobile terminal 50 will determine the common ignition sequence according to the number of cylinders included in the engine 60, and select the common ignition sequence as the preset ignition sequence corresponding to the current vehicle model; on the operation interface of the mobile terminal 50, select whether to use the ignition signal, if If you choose to use the ignition signal, the automotive diagnostic equipment will perform the function of locating the position of the leaking cylinder. If you choose not to use the ignition signal, the automotive diagnostic equipment will perform the function of testing the relative pressure of each cylinder of the engine and determine the minimum leakage. The percentage of the relative pressure of the cylinder and the cylinders other than the cylinder with the smallest leakage to the relative pressure of the cylinder with the smallest leakage; click on the operation interface of the mobile terminal 50 to start the test, and then press the accelerator pedal to the bottom to ensure that the throttle valve is fully The oscilloscope 40 collects data from 6 to 9 seconds during the operation of the engine 60. After the data collection is completed, the oscilloscope 40 processes the collected data and transmits the processed data to the mobile terminal 50, and the mobile terminal 50 displays the data. Test results from automotive diagnostic equipment.

FIG. 2 shows a schematic structural diagram of an oscilloscope according to an embodiment of the present invention. The specific embodiment of the present invention does not limit the specific implementation of the oscilloscope.

As shown in FIG. 2 , the oscilloscope may include: a processor (processor) 402 , a communication interface (Communications Interface) 404 , a memory (memory) 406 , and a communication bus 408 .

The processor 402 , the communication interface 404 , and the memory 406 communicate with each other through the communication bus 408 . The communication interface 404 is used for communicating with network elements of other devices such as clients or other servers. The processor 402 is used for executing the program 410 .

Specifically, program 410 may include program code, which includes computer-executable instructions.

The processor 402 may be a central processing unit CPU, or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present invention. The one or more processors included in the oscilloscope may be the same type of processors, such as one or more CPUs; or may be different types of processors, such as one or more CPUs and one or more ASICs.

The memory 406 is used to store the program 410 . Memory 406 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk memory.

The oscilloscope of the embodiment of the present invention can make the processor execute the operation of the method for locating the leaking cylinder of the engine by invoking the program. The process of executing the leaking cylinder locating method of the engine by the processor of the oscilloscope will be described in detail below.

FIG. 3 shows a flowchart of a method for locating a leaking cylinder of an engine according to an embodiment of the present invention, where the engine includes a plurality of cylinders, and the method is executed by an oscilloscope. Stored in the memory of the oscilloscope is a program that causes the oscilloscope's processor to perform the operations of the engine's leaking cylinder location method. As shown in Figure 3, the method includes the following steps:

Step 110: Determine a calibration cylinder among the plurality of cylinders and a physical location of the calibration cylinder in the engine.

Wherein, the calibration cylinder is a cylinder in the engine, and any one cylinder can be selected as the calibration cylinder among the multiple cylinders of the engine. After the calibration cylinder among the plurality of cylinders of the engine is determined, the physical location of the calibration cylinder in the engine can be further determined. The multiple cylinders of the engine are generally distributed in different physical positions in the engine. The physical positions of different cylinders in the engine can be numbered, and the physical position number of the calibration cylinder can be determined. According to the physical position number of the calibration cylinder, the calibration cylinder can be determined. Physical location in the engine. For example, the engine includes 4 cylinders, and the physical position numbers of the 4 cylinders are 1, 2, 3, and 4, respectively. Further, the cylinder corresponding to the physical position number 2 may be determined as the calibration cylinder.

Step 120: Collect the waveform of the output voltage of the power supply of the engine and the waveform of the ignition signal of the calibration cylinder.

Among them, the power supply of the engine is generally a DC power supply, which is used to supply power to the engine during the operation of the engine. During the working process of the engine, multiple cylinders of the engine take turns to do work, which causes the output voltage of the power supply to fluctuate. Therefore, according to the waveform of the output voltage of the power supply of the engine, the work of multiple cylinders of the engine can be analyzed to identify the leaking cylinder of the engine. When the calibration cylinder does work, the waveform of the ignition signal of the calibration cylinder will fluctuate. When the cylinders other than the calibration cylinder do work, the waveform of the ignition signal of the calibration cylinder will not fluctuate. Therefore, according to the waveform of the ignition signal of the calibration cylinder, the work of the calibration cylinder can be analyzed to identify the time when the calibration cylinder does work. For example, as shown in Fig. 4(a) and Fig. 4(b), Fig. 4(a) is a partial waveform diagram of the output voltage of the power supply of the engine, and Fig. 4(b) is a partial waveform diagram of the ignition signal of the calibration cylinder . Among them, in the partial waveform shown in Fig. 4(a), the time periods during which the waveform of the output voltage of the power supply fluctuates are respectively in the t1 time period, the t2 time period, the t3 time period, the t4 time period, the t5 time period, and the t6 time period. time period, t7 time period and t8 time period. In the partial waveform shown in FIG. 4( b ), the time periods during which the waveform of the ignition signal of the calibration cylinder fluctuates are respectively in the T1 time period and the T2 time period.

Step 130: Identify a first preset band in the waveform of the ignition signal, and determine a band time corresponding to the first preset band.

Wherein, the first preset waveband in the waveform of the ignition signal can be identified according to the first preset identification algorithm, and the waveband time corresponding to the first preset waveband can be determined. The first preset waveband may be, for example, a wave crest, and the waveband time corresponding to the first predetermined waveband is the wave crest time corresponding to the wave crest coordinate of the wave crest. The first preset identification algorithm may, for example, identify the peaks in the waveform of the ignition signal, and further identify the peak coordinates of the peaks, and determine the time coordinate value of the peak coordinates as the band time.

For example, the first preset waveband may also be a trough, which is not limited in the present invention. In FIG. 4( b ), the first preset band is, for example, the band corresponding to the T1 time period, and the first preset band can also be determined to be the band corresponding to the T2 time period. In the embodiment of the present invention, determining the first preset band as the band corresponding to the T1 time period has the same technical effect as determining the first preset band as the band corresponding to the T2 time period.

In the initial stage of engine startup, the waveform of the ignition signal of the calibration cylinder cannot well reflect the work of the calibration cylinder. Therefore, the waveform corresponding to the initial stage of engine startup can be excluded from the waveform of the ignition signal. Then, low-pass filtering is performed on the waveform of the ignition signal to filter out the interference of the high-frequency noise on the waveform of the ignition signal. In an optional manner, starting from the starting position of the waveform of the ignition signal, the waveform within the preset time range can be eliminated, so as to prevent the waveform within the preset time range from interfering with the identification of the first preset frequency band, and then Low-pass filtering is performed on the waveform of the ignition signal after eliminating the waveform within the preset time range, and then the step of identifying the first preset band in the waveform of the ignition signal is performed. The preset time range can be set according to the starting condition of the engine, and further, the time range between when the engine starts to start to when the cylinder starts to work can be determined as the preset time range. If the time between the start of the engine and the start of the cylinders is 0.25s, the waveform of the first 0.25s in the waveform of the ignition signal can be eliminated to prevent the waveform of the first 0.25s in the waveform of the ignition signal from being used to identify the first preset band. interference.

In order to prevent the waveform data of the ignition signal from being unstable on both sides of the head and tail, and interfering with the identification of the first preset band, a part of the waveform of the ignition signal can be extracted, and the first preset can be identified on the part of the waveform. band. In an optional manner, a preset area of the waveform of the ignition signal may be extracted, for example, the middle area of the waveform of the ignition signal may be used as the preset area, and the middle area may, for example, account for 80% of the total area of the waveform of the ignition signal ; After extracting the preset area, in the preset area, identify the first preset waveband in the waveform of the ignition signal, and then perform the step of determining the waveband time corresponding to the first preset waveband.

Step 140 : Identify the second preset waveband in the waveform of the output voltage, classify the second preset waveband, and determine the cylinder identifier corresponding to each type of the second preset waveband.

Wherein, the second preset waveband in the waveform of the output voltage can be identified according to the second preset identification algorithm, and the waveform of the output voltage includes a plurality of second preset wavebands. The second preset band may be, for example, a peak, and the waveform of the output voltage includes a plurality of peaks. Correspondingly, the second preset identification algorithm may, for example, identify peaks in the waveform of the output voltage. During the working process of the engine, multiple cylinders of the engine perform work in turn, so that multiple peaks appear on the waveform of the output voltage of the power supply. In one ignition cycle of the engine, each cylinder of the engine performs work once, which corresponds to a plurality of adjacent peaks on the waveform of the ignition signal.

For example, the second preset band may also be a trough, which is not limited in the present invention. In Figure 4(a), the time periods corresponding to the second preset band are respectively t1 time period, t2 time period, t3 time period, t4 time period, t5 time period, t6 time period, t7 time period and t8 time period .

Wherein, the second preset wavebands may be classified to generate multiple categories of second preset wavebands, and each category of second preset wavebands corresponds to different cylinders of the engine. After classifying the second preset frequency bands, the cylinder identifier corresponding to each type of the second preset frequency bands can be further determined.

In an optional manner, the ignition cycle of the engine may be determined according to the number of cylinders of the engine, the second preset frequency bands may be classified according to the ignition cycle and the number of cylinders, and the cylinder identifier corresponding to each type of the second preset frequency band may be determined . The number of categories of the second preset bands is equal to the number of cylinders, and the number of the second preset bands included in the second preset bands of each category is equal to the ignition period.

For example, if the number of cylinders of the engine is 4, the waveform of the output voltage and the waveform of the ignition signal in Fig. 4(a) and Fig. 4(b) correspond to two complete ignition cycles of the engine, and the second preset band can be performed on the second preset band. The following classifications are as follows: the band in the t1 time period corresponds to cylinder a, the band in the t2 time period corresponds to the cylinder b, the band in the t3 time period corresponds to the cylinder c, the band in the t4 time period corresponds to the cylinder d, the band in the t5 time period corresponds to the cylinder a, and the time period t6 The wave band of the period corresponds to cylinder b, the wave band of the t7 period corresponds to the cylinder c, and the wave band of the t8 period corresponds to the cylinder d. a, b, c and d are the cylinder identifiers of the four cylinders of the engine, respectively. Further, the bands in the t1 time period and the bands in the t5 time period can be classified into one category, the bands in the t2 time period and the bands in the t6 time period can be classified into one category, and the bands in the t3 time period and the t7 time period are classified into one category. The bands are grouped together, and the bands in the t4 time period are grouped together with the bands in the t8 time period. Therefore, four categories of second preset bands can be generated, and the cylinder identifiers corresponding to the second preset bands of each category are a, b, c, and d, respectively.

Step 150: Sort the cylinder identifiers according to the firing order of the cylinders corresponding to the cylinder identifiers to generate a cylinder identifier sequence, and determine the position of the cylinder identifier corresponding to the band time in the cylinder identifier sequence as the first cylinder identifier. a sequence of positions.

The cylinder identifiers may be sorted according to the firing order of the cylinders corresponding to the cylinder identifiers to generate a cylinder identifier sequence. Further, the second preset waveband with the earliest acquisition time corresponding to each cylinder identification may be determined as the initial waveband of the cylinder identification. The corresponding cylinder identifiers are sorted according to the sequence of the acquisition time of the initial waveband to generate a cylinder identifier sequence, which is used to indicate the firing sequence of the cylinders of the engine through the cylinder identifiers. For example, the second preset band with the earliest acquisition time corresponding to the cylinder identifier a is the band in the t1 time period, the second preset band with the earliest acquisition time corresponding to the cylinder identifier b is the band in the t2 time period, and the cylinder identifier c The corresponding second preset band with the earliest acquisition time is the band in the time period t3, and the band with the earliest acquisition time corresponding to the cylinder identifier d is the second preset band in the time period t4. Therefore, the initial band of the cylinder identifier a is the band of the time period t1, the initial band of the cylinder identifier b is the band of the time period t2, the initial band of the cylinder identifier c is the band of the time period t3, and the initial band of the cylinder identifier d is the time period of t4. the band of the segment. Since the initial wavebands are sorted in the order of acquisition time as the waveband in the t1 time period, the waveband in the t2 period, the waveband in the t3 period and the waveband in the t4 period, the generated cylinder identification sequence is a-b-c-d.

The cylinder identifier corresponding to the band time is the cylinder identifier of the calibration cylinder. The cylinder identifier corresponding to the band time can be determined first, and then the position of the cylinder identifier corresponding to the band time in the cylinder identifier sequence is determined as the first sequence position.

In an optional manner, the first preset band is a peak in the waveform of the ignition signal, and the second preset band is a peak in the waveform of the output voltage. When performing the step of determining the position of the cylinder identification corresponding to the band time in the cylinder identification sequence as the first sequence position, the waveform of the output voltage corresponding to the peak coordinate with the smallest time difference between the band time and the band time may be first determined. The second preset band is determined as the matching band, the cylinder identifier corresponding to the matching band is determined as the cylinder identifier corresponding to the band time, and then the position of the cylinder identifier corresponding to the band time in the cylinder identifier sequence is determined as the first sequence position .

For example, in the waveform of the ignition signal shown in FIG. 4(b), the first preset waveband is the waveband of the T1 time period, the waveband of the T1 period of time is the peak, and the waveband time corresponding to the first preset waveband is the T1 period of time peak time. In the waveform of the output voltage shown in FIG. 4( a ), the second preset waveband corresponding to the peak coordinate with the minimum time difference with the waveband time is the waveband of the t2 time period. Therefore, the t2 time period can be The band is determined to be the matching band. Since the cylinder identifier corresponding to the band of the t2 time period is b, the position of the cylinder identifier b in the cylinder identifier sequence is the first sequence position. Since the cylinder identification sequence is a-b-c-d, the first sequence position is the second position from the left.

Step 160: Determine the cylinder identifier corresponding to the leaking cylinder, and determine the position of the cylinder identifier corresponding to the leaking cylinder in the cylinder identifier sequence as the second sequence position.

Among them, the leaking cylinder is a cylinder in which leakage occurs among multiple cylinders of the engine. When the leaking cylinder performs work, the internal air pressure is reduced, so the work of the leaking cylinder is reduced. After the cylinder identifier corresponding to the leaking cylinder is determined, the position of the cylinder identifier corresponding to the leaking cylinder in the cylinder identifier sequence may be further determined as the second sequence position. For example, if it is determined that the cylinder identification corresponding to the leaking cylinder is c, and if the cylinder identification sequence is a-b-c-d, the second sequence position is the third position from the left.

In an optional manner, when the step of determining the cylinder identifier corresponding to the leaking cylinder is performed, a preset relative pressure algorithm may be used to calculate the relative pressure of the cylinder corresponding to the second preset frequency band of each type, and the relative pressure The second preset band category corresponding to the minimum value is determined as the leakage band category, and the cylinder identifier corresponding to the leakage band category is determined as the cylinder identifier corresponding to the leaking cylinder.

The second preset waveband is, for example, a wave crest, and the crest coordinates of the wave crest include a time coordinate and a volt value coordinate. The preset relative pressure algorithm can be based on the volt value difference corresponding to the second preset band, and the volt value difference is used to identify the fluctuation of the output voltage of the power supply of the engine before and after the cylinder performs power, and each second preset band corresponds to a volt value difference, Each cylinder identification corresponds to a number of volt differences. For example, the calculation formula of the volt difference can be:

Volt value difference = Volt value coordinate corresponding to the sum of time coordinate and time offset - Volt value coordinate corresponding to the difference between time coordinate and time offset; wherein, the time offset is a time constant.

Further, a plurality of volt value differences of each cylinder identifier can be generated, and the volt value difference of each cylinder identifier can be sorted according to the sequence of acquisition time to generate a volt value difference sequence of each cylinder identifier. The relative pressure of each cylinder of the engine is calculated according to the volt value difference sequence, and the cylinder identifier corresponding to the minimum value of the relative pressure is determined as the cylinder identifier of the leaking cylinder. For example, the calculation formula of relative pressure can be:

Relative pressure=first preset coefficient*median of volt value difference sequence+second preset coefficient*average value of volt value difference sequence.

Step 170: Determine the leakage cylinder in the engine according to the preset firing order of the plurality of cylinders, the first sequence position, the second sequence position, and the physical position of the calibration cylinder in the engine The physical position in , wherein the preset firing order is the firing order identified by the physical positions of the plurality of cylinders.

Wherein, the physical position of the leaking cylinder in the engine is determined according to the preset firing sequence of the plurality of cylinders, the first sequence position, the second sequence position and the physical position of the calibration cylinder in the engine.

In an optional manner, the possible firing order is determined according to the preset firing order of the plurality of cylinders. The possible firing order is the firing order of the cylinders based on the preset firing order, and the possible firing order includes multiple types. For example, as shown in Figure 3, the engine includes 4 cylinders, and 1, 2, 3, and 4 are used to denote the cylinder at physical position 1, the cylinder at physical position 2, the cylinder at physical position 3, and the cylinder at physical position 4, respectively. The preset ignition sequence of the engine is 1/4/3/2. Since the final stop position of the crankshaft will be different at the end of each engine work, the cylinder that will be ignited first by the engine next time will also be different, so the ignition sequence may be different. This includes 1/4/3/2, 4/3/2/1, 3/2/1/4 and 2/1/4/3. Based on the first sequence position and the physical position of the calibrated cylinders in the engine, the actual firing sequence is filtered from the possible firing sequences. For example, if the first sequence position is the third position from the left, and the calibrated cylinder is the cylinder at physical position 2, the actual firing sequence selected from the possible firing sequences is 4/3/2/1. Based on the second sequence position and the actual firing sequence, the physical location of the leaking cylinder in the engine is determined. For example, if the second sequence position is the fourth position from the left, the physical position of the leaking cylinder in the engine is physical position 1 .

The embodiment of the present invention can identify the first preset band and the second preset band by collecting the waveform of the output voltage of the power supply of the engine and the waveform of the ignition signal of the calibration cylinder; the band time can be determined according to the first preset band, Classifying the second preset frequency bands can determine the cylinder identifiers corresponding to each type of second preset frequency bands; sorting the cylinder identifiers according to the firing order of the cylinders corresponding to the cylinder identifiers can generate a cylinder identifier sequence, and further can determine the first Sequence position and second sequence position; the physical position of the leaking cylinder in the engine can be determined according to the preset firing order of the plurality of cylinders, the first sequence position, the second sequence position and the physical position of the calibration cylinder in the engine. In the above manner, rapid positioning of the leaking cylinder of the engine can be achieved.

FIG. 5 shows a schematic structural diagram of a leaking cylinder locating device for an engine according to an embodiment of the present invention, where the engine includes a plurality of cylinders. As shown in FIG. 5 , the apparatus 300 includes: a first determination module 310 , a collection module 320 , a second determination module 330 , a third determination module 340 , a fourth determination module 350 , a fifth determination module 360 and a sixth determination module 370 .

a first determination module 310, configured to determine a calibration cylinder in the plurality of cylinders and a physical position of the calibration cylinder in the engine;

a collection module 320, configured to collect the waveform of the output voltage of the power supply of the engine and the waveform of the ignition signal of the calibration cylinder;

A second determination module 330, configured to identify a first preset band in the waveform of the ignition signal, and determine a band time corresponding to the first preset band;

The third determination module 340 is configured to identify the second preset waveband in the waveform of the output voltage, classify the second preset waveband, and determine the cylinder corresponding to each type of the second preset waveband identification;

The fourth determination module 350 is configured to sort the cylinder identifiers according to the firing order of the cylinders corresponding to the cylinder identifiers to generate a cylinder identifier sequence, and include the cylinder identifiers corresponding to the band time in the cylinder identifier sequence The position of is determined as the first sequence position;

The fifth determination module 360 is configured to determine the cylinder identifier corresponding to the leaking cylinder, and determine the position of the cylinder identifier corresponding to the leaking cylinder in the cylinder identifier sequence as the second sequence position;

A sixth determination module 370 for determining the leakage based on a preset firing order of the plurality of cylinders, the first sequence position, the second sequence position, and the physical position of the calibration cylinder in the engine Physical positions of cylinders in the engine, wherein the preset firing order is a firing order identified by the physical positions of the plurality of cylinders.

In an optional manner, the first preset band is a peak in the waveform of the ignition signal, the second preset band is a peak in the waveform of the output voltage, and the fourth determination module 350 Used for:

In the waveform of the output voltage, the second preset band corresponding to the peak coordinate with the smallest time difference with the band time is determined as a matching band;

determining the cylinder identifier corresponding to the matching band as the cylinder identifier corresponding to the band time;

The position of the cylinder identification corresponding to the band time in the cylinder identification sequence is determined as the first sequence position.

In an optional manner, the fifth determination module 360 is used for:

Calculate the relative pressure of the cylinder corresponding to each type of the second preset band by using a preset relative pressure algorithm;

determining the second preset band category corresponding to the minimum value of the relative pressure as the leakage band category;

The cylinder identifier corresponding to the leakage band category is determined as the cylinder identifier corresponding to the leaking cylinder.

In an optional manner, the sixth determination module 370 is configured to:

A possible ignition sequence is determined according to the preset ignition sequence of the plurality of cylinders, the possible ignition sequence is a cylinder ignition sequence based on the preset ignition sequence, and the possible ignition sequence includes multiple types;

filtering out an actual firing sequence from the possible firing sequences according to the first sequence position and the physical position of the calibration cylinder in the engine;

Based on the second sequence position and the actual firing sequence, the physical position of the leaking cylinder in the engine is determined.

In an optional manner, the third determining module 340 is used for:

determining the ignition cycle of the engine according to the number of cylinders of the engine;

classifying the second preset frequency bands according to the ignition period and the number of cylinders, wherein each type of the second preset frequency bands corresponds to different cylinders of the engine;

Determine the cylinder identifier corresponding to each type of the second preset frequency band.

In an optional manner, the second determining module 330 is configured to:

extracting a preset area of the waveform of the ignition signal;

In the preset area, a first preset band in the waveform of the ignition signal is identified.

In an optional manner, the second determining module 330 is configured to:

Starting from the starting position of the waveform of the ignition signal, remove the waveform within the preset time range;

A low-pass filtering process is performed on the waveform of the ignition signal after eliminating the waveform within the preset time range.

The leaking cylinder locating device of the engine according to the embodiment of the present invention can identify the first preset band and the second preset band by collecting the waveform of the output voltage of the power supply of the engine and the waveform of the ignition signal of the calibration cylinder; Set the band to determine the band time, classify the second preset bands, and determine the cylinder identifiers corresponding to each type of the second preset bands; the cylinder identifiers can be generated by sorting the cylinder identifiers according to the firing order of the cylinders corresponding to the cylinder identifiers. sequence, the first sequence position and the second sequence position can be further determined; according to the preset firing sequence of the plurality of cylinders, the first sequence position, the second sequence position and the physical position of the calibration cylinder in the engine, it can be determined that the leaking cylinder is in the engine physical location. It can be seen that the device for locating the leaking cylinder of the engine according to the embodiment of the present invention can quickly locate the leaking cylinder of the engine.

An embodiment of the present invention provides a computer-readable storage medium, where the storage medium stores at least one executable instruction, and when the executable instruction is run on an oscilloscope, the oscilloscope causes the oscilloscope to execute the operation of the engine in any of the foregoing method embodiments. Leaky cylinder location method.

An embodiment of the present invention provides a device for locating a leaking cylinder of an engine, which is used to execute the above-mentioned method for locating a leaking cylinder of an engine.

Embodiments of the present invention provide a computer program, which can be invoked by a processor to cause an oscilloscope to execute the method for locating a leaky cylinder of an engine in any of the above method embodiments.

An embodiment of the present invention provides a computer program product. The computer program product includes a computer program stored on a computer-readable storage medium, and the computer program includes program instructions. When the program instructions are run on a computer, the computer is made to execute any of the above. A method of locating a leaking cylinder of an engine in a method embodiment.

The algorithms or displays provided herein are not inherently related to any particular computer, virtual system, or other device. Various general-purpose systems can also be used with teaching based on this. The structure required to construct such a system is apparent from the above description. Furthermore, embodiments of the present invention are 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 embodiments of the invention are sometimes grouped together into a single implementation in order to simplify the invention and to aid in the understanding of one or more of the various aspects of the invention. examples, figures, or descriptions thereof. 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.

Those skilled in the art can 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 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.

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. The steps in the above embodiments should not be construed as limitations on the execution order unless otherwise specified.

Claims (10)

1. A method for locating a leaking cylinder of an engine, wherein the engine includes a plurality of cylinders, and the method includes:

   determining a calibration cylinder of the plurality of cylinders and a physical location of the calibration cylinder in the engine;

   collecting the waveform of the output voltage of the power supply of the engine and the waveform of the ignition signal of the calibration cylinder;

   Identifying a first preset band in the waveform of the ignition signal, and determining a band time corresponding to the first preset band;

   Identifying a second preset waveband in the waveform of the output voltage, classifying the second preset waveband, and determining a cylinder identifier corresponding to each type of the second preset waveband;

   Sort the cylinder identifiers according to the firing order of the cylinders corresponding to the cylinder identifiers to generate a cylinder identifier sequence, and determine the position of the cylinder identifier corresponding to the band time in the cylinder identifier sequence as the first sequence position ;

   determining the cylinder identification corresponding to the leaking cylinder, and determining the position of the cylinder identification corresponding to the leaking cylinder in the cylinder identification sequence as the second sequence position;

   The physical location of the leaking cylinder in the engine is determined from the preset firing order of the plurality of cylinders, the first sequence position, the second sequence position, and the physical position of the calibration cylinder in the engine position, wherein the preset firing order is a firing order identified by the physical positions of the plurality of cylinders.
2. The method according to claim 1, wherein the first preset band is a peak in the waveform of the ignition signal, and the second preset band is a peak in the waveform of the output voltage;

   The determining the position of the cylinder identifier corresponding to the band time in the cylinder identifier sequence as the first sequence position includes:

   In the waveform of the output voltage, the second preset band corresponding to the peak coordinate with the smallest time difference with the band time is determined as a matching band;

   determining the cylinder identifier corresponding to the matching band as the cylinder identifier corresponding to the band time;

   The position of the cylinder identification corresponding to the band time in the cylinder identification sequence is determined as the first sequence position.
3. The method according to claim 1 or 2, wherein the determining the cylinder identifier corresponding to the leaking cylinder comprises:

   Calculate the relative pressure of the cylinder corresponding to each type of the second preset band by using a preset relative pressure algorithm;

   determining the second preset band category corresponding to the minimum value of the relative pressure as the leakage band category;

   The cylinder identifier corresponding to the leakage band category is determined as the cylinder identifier corresponding to the leaking cylinder.
4. 2. The method of claim 1, wherein the predetermined firing order according to the plurality of cylinders, the first sequence position, the second sequence position, and the calibration cylinder are in the engine The physical location of the leaking cylinder in the engine is determined by:

   A possible ignition sequence is determined according to the preset ignition sequence of the plurality of cylinders, the possible ignition sequence is a cylinder ignition sequence based on the preset ignition sequence, and the possible ignition sequence includes multiple types;

   filtering out an actual firing sequence from the possible firing sequences according to the first sequence position and the physical position of the calibration cylinder in the engine;

   Based on the second sequence position and the actual firing sequence, the physical position of the leaking cylinder in the engine is determined.
5. The method according to claim 1, wherein the classifying the second preset frequency band and determining the cylinder identifier corresponding to each type of the second preset frequency band comprises:

   determining the ignition cycle of the engine according to the number of cylinders of the engine;

   classifying the second preset frequency bands according to the ignition period and the number of cylinders, wherein each type of the second preset frequency bands corresponds to different cylinders of the engine;

   Determine the cylinder identifier corresponding to each type of the second preset frequency band.
6. The method according to claim 1, characterized in that before identifying the first preset band in the waveform of the ignition signal, the method comprises:

   extracting a preset area of the waveform of the ignition signal;

   The first preset frequency band in the waveform of the identified ignition signal includes:

   In the preset area, a first preset band in the waveform of the ignition signal is identified.
7. The method according to claim 6, wherein before extracting a preset region of the waveform of the ignition signal, the method comprises:

   Starting from the starting position of the waveform of the ignition signal, remove the waveform within the preset time range;

   A low-pass filtering process is performed on the waveform of the ignition signal after eliminating the waveform within the preset time range.
8. A device for locating a leaking cylinder of an engine, characterized in that the engine includes a plurality of cylinders, and the device includes:

   a first determination module, configured to determine a calibration cylinder in the plurality of cylinders and a physical position of the calibration cylinder in the engine;

   an acquisition module for acquiring the waveform of the output voltage of the power supply of the engine and the waveform of the ignition signal of the calibration cylinder;

   a second determining module, configured to identify a first preset band in the waveform of the ignition signal, and determine a band time corresponding to the first preset band;

   A third determination module, configured to identify a second preset band in the waveform of the output voltage, classify the second preset band, and determine the cylinder identifier corresponding to each type of the second preset band ;

   The fourth determination module is used to sort the cylinder identifiers according to the firing order of the cylinders corresponding to the cylinder identifiers to generate a cylinder identifier sequence, and identify the cylinder corresponding to the band time in the cylinder identifier sequence. The position is determined to be the first sequence position;

   a fifth determination module, configured to determine the cylinder identifier corresponding to the leaking cylinder, and determine the position of the cylinder identifier corresponding to the leaking cylinder in the cylinder identifier sequence as the second sequence position;

   a sixth determination module, configured to determine the leaking cylinder according to the preset firing order of the plurality of cylinders, the first sequence position, the second sequence position, and the physical position of the calibration cylinder in the engine A physical location in the engine, wherein the preset firing order is a firing order identified by the physical locations of the plurality of cylinders.
9. An oscilloscope, characterized in that it comprises: a processor, a memory, a communication interface and a communication bus, and the processor, the memory and the communication interface communicate with each other through the communication bus;

   The memory is used to store at least one executable instruction, and the executable instruction causes the processor to execute the operation of the method for locating a leaking cylinder of an engine according to any one of claims 1-7.
10. A computer-readable storage medium, characterized in that the storage medium stores at least one executable instruction, and when the executable instruction is executed on a computing device, the computing device executes any one of claims 1-7. The operation of the leaking cylinder locating method of the engine.

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