CN111966079A - Method for detecting waveform of saturated switch type oil injector based on key point identification - Google Patents

Method for detecting waveform of saturated switch type oil injector based on key point identification Download PDF

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CN111966079A
CN111966079A CN202010869792.1A CN202010869792A CN111966079A CN 111966079 A CN111966079 A CN 111966079A CN 202010869792 A CN202010869792 A CN 202010869792A CN 111966079 A CN111966079 A CN 111966079A
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oil injection
switch type
waveform data
type oil
pulse waveform
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CN111966079B (en
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葛永琪
郑兴建
樊星
董蕊
苗星宇
李骐元
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Ningxia University
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B23/00—Testing or monitoring of control systems or parts thereof
    • G05B23/02—Electric testing or monitoring
    • G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
    • G05B23/0208—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterized by the configuration of the monitoring system
    • G05B23/0213—Modular or universal configuration of the monitoring system, e.g. monitoring system having modules that may be combined to build monitoring program; monitoring system that can be applied to legacy systems; adaptable monitoring system; using different communication protocols
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/20—Pc systems
    • G05B2219/24—Pc safety
    • G05B2219/24065—Real time diagnostics
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Abstract

A method for detecting waveforms of a saturated switch type oil sprayer based on key point identification relates to the technical field of fault detection of an automobile engine ECU, and comprises five steps, wherein according to the five steps, saturated switch type oil spraying pulse waveform data are obtained firstly, then a key point difference value calculation formula and a total difference value calculation formula are used for calculating key point difference values and total difference values of standard saturated switch type oil spraying pulse waveform data and saturated switch type oil spraying pulse waveform data, whether faults exist in an ECU oil spraying driving chip or not is judged according to the two difference values, whether faults exist in corresponding positions of key points or not is judged, manual judgment is not needed through a direct observation method, and even if the waveforms to be detected are similar to the standard saturated switch type oil spraying pulse waveforms and different in amplitude, the waveform data of the two are also different. The invention converts the waveform judgment into the waveform data judgment, so that the relative error of the detected fault is smaller.

Description

Method for detecting waveform of saturated switch type oil injector based on key point identification
Technical Field
The invention relates to the technical field of fault detection of an automobile engine ECU (electronic control unit), in particular to a waveform detection method of a saturated switch type oil sprayer based on key point identification.
Background
Along with the development of high integration of the ECU of the automobile engine, the difficulty of fault diagnosis of the ECU oil injection driving chip is higher and higher. How to simply, conveniently and accurately identify the fault of the ECU oil injection driving chip is a troublesome problem to be solved by automobile ECU manufacturers. The traditional detection technology measures the voltage of an ECU pin to be detected in real time by means of a voltmeter so as to find out a fault part, but when the voltage of each ECU pin is normal but the ECU oil injection driving chip is not fault-free, the method cannot completely confirm that the ECU oil injection driving chip is fault-free.
The saturation switch type oil injection pulse is an important output signal of an engine ECU oil injection driving chip, the problem can be effectively solved by combining the saturation switch type oil injection pulse and adopting a waveform detection method, namely, after acquiring the waveform data of the saturation switch type oil injection pulse, the time-voltage waveform of the corresponding saturation switch type oil injection pulse is displayed through an oscilloscope, and whether the waveform is normal or not is checked through a method of manually and directly observing the waveform.
Disclosure of Invention
In view of the above, it is desirable to provide a method for detecting a saturated switching injector waveform based on key point identification that replaces direct observation to determine faults.
A method for detecting a waveform of a saturated switch type oil sprayer based on key point identification comprises the following steps:
(1) selecting an ECU to be detected, collecting real vehicle saturation switch type oil injection pulse waveform data, and carrying out filtering processing on the waveform data, wherein the real vehicle saturation switch type oil injection pulse waveform data are voltage data;
(2) extracting complete waveform data from the actual vehicle saturation switch type oil injection pulse waveform data to serve as saturation switch type oil injection pulse waveform data;
(3) three key voltage points of the saturated switch type oil injection pulse waveform data are extracted: the voltage point is a voltage point a for starting oil injection, a peak voltage point b for stopping oil injection and a voltage point c for recovering to the voltage of a storage battery of the oil injector;
(4) obtaining standard saturation switch type oil injection pulse waveform data, and extracting three key voltage points of the standard saturation switch type oil injection pulse waveform data, wherein the three key voltage points are respectively as follows: the voltage point a ' for starting oil injection, the peak voltage point b ' for stopping oil injection and the voltage point c ' for recovering to the voltage of the storage battery of the oil injector;
(5) calculating three key points a, b and c of the saturated switch type oil injection pulse waveform data and three key points a ', b ' and c ' of the standard saturated switch type oil injection pulse waveform data through a key point difference value calculation formula to obtain three key point difference values;
if the difference values of the three key points are within the preset difference value range, the corresponding positions of the three key points have no fault, then the saturated switch type oil injection pulse waveform data and the standard saturated switch type oil injection pulse waveform data are calculated through a total difference value calculation formula to obtain a total difference value, and if the total difference value is within the preset difference value range, the ECU oil injection driving chip has no fault; if the total difference value is not within the preset difference value range, the ECU oil injection driving chip has a fault;
if any one of the difference values of the three key points is not in the preset difference value range, the corresponding position of the key point has a fault.
Preferably, the step (3) is specifically:
the first step is as follows: arranging the saturated switch type oil injection pulse waveform data into a group of one-dimensional arrays h [ i ], and arranging two adjacent data into a group of data;
the second step is that: calculating the difference value from the 1 st group of data h 0 and h 1, i.e. | h 0-h 1 | and so on;
the third step: calculating and finding h [ j ] and h [ j +1], satisfying that | h [ j ] -h [ j +1] | is less than or equal to 1, continuously calculating each subsequent group of data until h [ j + n ] and h [ j + n +1] are found, satisfying that | h [ j + n ] -h [ j + n +1] | is more than 1, and then comparing the sizes of h [ j + n ] and h [ j + n +1 ]:
if h [ j + n ] is larger than h [ j + n +1], then h [ j + n +1] is a voltage point a for starting oil injection; again: continuing to calculate each subsequent group of data until h [ x ] and h [ x +1] are found, satisfying that | h [ x ] -h [ x +1] is less than or equal to 1, continuing to calculate each subsequent group of data until h [ x + n ] and h [ x + n +1] are found, satisfying that | h [ x + n ] -h [ x + n +1] is greater than 1, then comparing the sizes of h [ x + n ] and h [ x + n +1], if h [ x + n ] is less than h [ x + n +1] and h [ x + n +1] is greater than 30, then h [ x + n +1] is a peak voltage point b generated by stopping oil injection, and continuing to compare and calculate each subsequent group of data; if h [ x + n ] > h [ x + n +1] or h [ x + n +1] is not more than 30, then restart from Again;
if h [ j + n ] < h [ j + n +1], restarting from the second step;
the fourth step: until h [ z ] and h [ z +1] are found, h [ z ] is larger than h [ z +1], and | h [ z ] -h [ z +1] | is larger than 1, each subsequent group of data is continuously calculated until h [ z + n ] and h [ z + n +1] are found, | h [ z + n ] -h [ z + n +1] | is smaller than or equal to 1, and then h [ z + n +1] is taken as a voltage point c for recovering to the voltage of the storage battery of the fuel injector;
wherein j, n, x and z are natural numbers, x is larger than j + n +1, and z is larger than x + n + 1.
Preferably, the standard saturation on-off type injection pulse waveform data in step (4) is obtained by:
the first step is as follows: collecting standard real vehicle saturation switch type oil injection pulse waveform data under the fault-free state of an ECU oil injection driving chip;
the second step is that: and extracting a complete waveform data from the standard real vehicle saturation switch type oil injection pulse waveform data to be used as the standard saturation switch type oil injection pulse waveform data.
Preferably, after the standard saturation on-off type oil injection pulse waveform data is obtained in the step (4), the method further comprises the following steps: the standard saturated switch type oil injection pulse waveform data are arranged into a group of one-dimensional arrays s [ i ], and the s [ i ] and the h [ i ] are aligned pairwise in sequence.
Preferably, three key voltage points of the standard saturation switch type oil injection pulse waveform data in the step (4) are determined values, that is, a voltage point a ' corresponding to start oil injection in the standard saturation switch type oil injection pulse waveform data generated in the ECU oil injection driving chip in the fault-free state, a peak voltage point b ' corresponding to stop oil injection in the standard saturation switch type oil injection pulse waveform data generated in the ECU oil injection driving chip in the fault-free state, and a voltage point c ' corresponding to recover to the voltage of the accumulator of the oil injector in the standard saturation switch type oil injection pulse waveform data generated in the fault-free state of the ECU oil injection driving chip.
Preferably, the key point difference value calculation formula in step (5) is:
|x-y|
wherein x is a or b or c; y is a ' or b ' or c '; the difference values of the three key points are respectively: the value obtained by calculation when x is a and y is a ', the value obtained by calculation when x is b and y is b ', and the value obtained by calculation when x is c and y is c '.
Preferably, the total difference calculation formula in step (5) is a pearson correlation coefficient calculation formula:
Figure BDA0002650710520000041
wherein n is the number of the saturated switch type oil injection pulse waveform data or the standard saturated switch type oil injection pulse waveform data, and the two are the same; x is the number ofiIs h [ i ]]The ith data;
Figure BDA0002650710520000042
is h [ i ]]Average value of (d); y isiIs s [ i ]]The ith data;
Figure BDA0002650710520000043
is s [ i ]]Average value of (a).
Preferably, the difference in step (5) is not greater than 1 within a predetermined range of difference, and is not greater than 1 within the predetermined range of difference.
By adopting the technical scheme, the invention has the beneficial effects that: according to the processing of the steps (1) to (5), firstly, saturated switch type oil injection pulse waveform data are obtained, then a key point difference value calculation formula and a total difference value calculation formula are used for calculating a key point difference value and a total difference value of the standard saturated switch type oil injection pulse waveform data and the saturated switch type oil injection pulse waveform data, whether a fault exists in an ECU oil injection driving chip or not is judged according to the two difference values, whether a fault exists in a corresponding position of a key point or not is judged, the waveform does not need to be manually measured through a direct observation method for judgment, and even if the waveform to be detected is similar to the standard saturated switch type oil injection pulse waveform and different in amplitude, the waveform data of the two are also different. The invention converts the waveform judgment into the waveform data judgment, so that the relative error of the detected fault is smaller.
Drawings
FIG. 1 is a flow chart of a saturated switching mode fuel injector waveform detection method based on keypoint identification.
Fig. 2 is a flow chart of a three key voltage point extraction method.
FIG. 3 is a waveform diagram of the acquired and filtered waveform data of the real-vehicle saturation switch type oil injection pulse displayed by an oscilloscope;
fig. 4 is a waveform diagram of a complete waveform data extracted from fig. 1 and displayed by an oscilloscope, that is, a waveform diagram of a saturation switch type oil injection pulse waveform data displayed by an oscilloscope, and indicates corresponding positions of three key voltage points a, b and c.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Referring to fig. 1, an embodiment of the present invention provides a method including the following steps:
and step S01, selecting the ECU to be detected, connecting the ECU by using a data acquisition card, acquiring the actual vehicle saturation switch type oil injection pulse waveform data, and performing five-point three-time smoothing method filtering processing on the waveform data, wherein the actual vehicle saturation switch type oil injection pulse waveform data is voltage data.
Step S02, extracting a complete waveform data from the actual vehicle saturation on-off type injection pulse waveform data as the saturation on-off type injection pulse waveform data, the actual vehicle saturation on-off type injection pulse waveform data being composed of a predetermined number of the saturation on-off type injection pulse waveform data in series.
Step S03, three key voltage points of the saturation switch-type injection pulse waveform data are extracted:
the first step is as follows: arranging the saturated switch type oil injection pulse waveform data into a group of one-dimensional arrays h [ i ], and arranging two adjacent data into a group of data;
the second step is that: calculating the difference value from the 1 st group of data h 0 and h 1, i.e. | h 0-h 1 | and so on;
the third step: calculating and finding h [ j ] and h [ j +1], satisfying that | h [ j ] -h [ j +1] | is less than or equal to 1, continuously calculating each subsequent group of data until h [ j + n ] and h [ j + n +1] are found, satisfying that | h [ j + n ] -h [ j + n +1] | is more than 1, and then comparing the sizes of h [ j + n ] and h [ j + n +1 ]:
if h [ j + n ] is larger than h [ j + n +1], then h [ j + n +1] is a voltage point a for starting oil injection; again: continuing to calculate each subsequent group of data until h [ x ] and h [ x +1] are found, satisfying that | h [ x ] -h [ x +1] is less than or equal to 1, continuing to calculate each subsequent group of data until h [ x + n ] and h [ x + n +1] are found, satisfying that | h [ x + n ] -h [ x + n +1] is greater than 1, then comparing the sizes of h [ x + n ] and h [ x + n +1], if h [ x + n ] is less than h [ x + n +1] and h [ x + n +1] is greater than 30, then h [ x + n +1] is a peak voltage point b generated by stopping oil injection, and continuing to compare and calculate each subsequent group of data; if h [ x + n ] > h [ x + n +1] or h [ x + n +1] is not more than 30, then restart from Again;
if h [ j + n ] < h [ j + n +1], restarting from the second step;
the fourth step: until h [ z ] and h [ z +1] are found, h [ z ] is larger than h [ z +1], and | h [ z ] -h [ z +1] | is larger than 1, each subsequent group of data is continuously calculated until h [ z + n ] and h [ z + n +1] are found, | h [ z + n ] -h [ z + n +1] | is smaller than or equal to 1, and then h [ z + n +1] is taken as a voltage point c for recovering to the voltage of the storage battery of the fuel injector;
wherein j, n, x and z are natural numbers, x is larger than j + n +1, and z is larger than x + n + 1.
Step S04, obtaining standard saturated on-off injection pulse waveform data:
the first step is as follows: collecting standard real vehicle saturation switch type oil injection pulse waveform data under the fault-free state of an ECU oil injection driving chip;
the second step is that: and extracting a complete waveform data from the standard real vehicle saturation switch type oil injection pulse waveform data as the standard saturation switch type oil injection pulse waveform data, wherein the standard real vehicle saturation switch type oil injection pulse waveform data is formed by continuously forming a preset number of standard saturation switch type oil injection pulse waveform data.
The third step: and after the standard saturation switch type oil injection pulse waveform data are obtained, arranging the standard saturation switch type oil injection pulse waveform data into a group of one-dimensional arrays s [ i ], aligning the s [ i ] and the h [ i ] pairwise in sequence, wherein the data quantity of the s [ i ] and the h [ i ] is the same.
Step S05, three key voltage points of the standard saturation switch type oil injection pulse waveform data are extracted and are determined values which are respectively: the voltage point a ' of starting oil injection corresponding to the standard saturation switch type oil injection pulse waveform data generated by the ECU oil injection driving chip in a fault-free state, the peak voltage point b ' of stopping oil injection corresponding to the standard saturation switch type oil injection pulse waveform data generated by the ECU oil injection driving chip in a fault-free state, and the voltage point c ' of recovering to the voltage of the oil injector storage battery corresponding to the standard saturation switch type oil injection pulse waveform data generated by the ECU oil injection driving chip in a fault-free state.
Step S06, calculating three key points a, b and c of the saturated switch type oil injection pulse waveform data and three key points a ', b ' and c ' of the standard saturated switch type oil injection pulse waveform data through a key point difference value calculation formula to obtain three key point difference values;
if the difference value of the three key points is not more than 1, the corresponding positions of the three key points have no fault, then the saturated switch type oil injection pulse waveform data and the standard saturated switch type oil injection pulse waveform data are calculated through a total difference value calculation formula to obtain a total difference value, and if the total difference value is not more than 1, the ECU oil injection driving chip has no fault; if the total difference is greater than 1, the ECU oil injection driving chip has a fault;
if any one of the difference values of the three key points is greater than 1, a fault exists at the corresponding position of the key point.
The key point difference value calculation formula is as follows:
|x-y|
wherein x is a or b or c; y is a ' or b ' or c '; the difference values of the three key points are respectively: the value obtained by calculation when x is a and y is a ', the value obtained by calculation when x is b and y is b ', and the value obtained by calculation when x is c and y is c '.
The corresponding failure of the calculation result of the key point difference value calculation formula is shown in table 1:
TABLE 1
Figure BDA0002650710520000071
The total difference value calculation formula is a Pearson correlation coefficient calculation formula:
Figure BDA0002650710520000072
wherein n is the number of the saturated switch type oil injection pulse waveform data or the standard saturated switch type oil injection pulse waveform data, and the two are the same; x is the number ofiIs h [ i ]]The ith data;
Figure BDA0002650710520000073
is h [ i ]]Average value of (d); y isiIs s [ i ]]The ith data;
Figure BDA0002650710520000074
is s [ i ]]Average value of (a).
Further, another alternative of step S02 is:
the first step is as follows: selecting a standard oil injection pulse template, wherein the standard oil injection pulse template is used for collecting complete waveform data in oil injection pulse waveform data of an ECU oil injection driving chip in a non-fault state, and the oil injection pulse waveform data of the ECU oil injection driving chip in the non-fault state is continuously composed of a preset number of standard oil injection pulse templates;
the second step is that: arranging the filtered real vehicle saturated switch type oil injection pulse waveform data into a group of one-dimensional arrays mj]Spraying the standardThe oil pulse template is arranged as a group of one-dimensional arrays n [ i ]]Determining mj]Has a data quantity of lmDetermining n [ i ]]Has a data quantity of lnWhen j is less than or equal to lm-l n1, carrying out subsequent step processing;
the third step: m 0]And n [0]]Calculating the difference value by the square calculation formula of the difference, and then calculating m 1]And n 1]Calculating the difference value by the square calculation formula of the difference, and calculating to m [ l ] by analogyn]And n [ ln]Accumulating and summing all the difference values obtained by the calculation;
the fourth step, make m 1]And n [0]]Calculating the difference value by the square calculation formula of the difference, and then calculating m 2]And n 1]Calculating the difference value by the square calculation formula of the difference, and calculating to m [ l ] by analogyn+1]And n [ ln]Accumulating and summing all the difference values obtained by the calculation;
the fifth step: analogizing according to the sequence of the first step and the second step, and listing the accumulated sum obtained by calculation as a group of one-dimensional arrays sum [ j ];
and a sixth step: finding the minimum value in sum [ j ], and satisfying the minimum value not more than 1;
the seventh step: minimum value of sum j]The subscript of the corresponding element in (1) is extracted m [ j ]]Subscript k of initial point element of middle saturation switch type oil injection pulse waveform data at mj]In m [ k ]]Taking l backward in sequence as the starting elementnAnd (4) as saturation on-off type oil injection pulse waveform data.
Wherein, the square calculation formula of the difference is as follows:
(x-y)2
while the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.

Claims (8)

1. A method for detecting the waveform of a saturated switch type oil sprayer based on key point identification is characterized by comprising the following steps: the method comprises the following steps:
(1) selecting an ECU to be detected, collecting real vehicle saturation switch type oil injection pulse waveform data, and carrying out filtering processing on the waveform data, wherein the real vehicle saturation switch type oil injection pulse waveform data are voltage data;
(2) extracting complete waveform data from the actual vehicle saturation switch type oil injection pulse waveform data to serve as saturation switch type oil injection pulse waveform data;
(3) three key voltage points of the saturated switch type oil injection pulse waveform data are extracted: the voltage point is a voltage point a for starting oil injection, a peak voltage point b for stopping oil injection and a voltage point c for recovering to the voltage of a storage battery of the oil injector;
(4) obtaining standard saturation switch type oil injection pulse waveform data, and extracting three key voltage points of the standard saturation switch type oil injection pulse waveform data, wherein the three key voltage points are respectively as follows: the voltage point a ' for starting oil injection, the peak voltage point b ' for stopping oil injection and the voltage point c ' for recovering to the voltage of the storage battery of the oil injector;
(5) calculating three key points a, b and c of the saturated switch type oil injection pulse waveform data and three key points a ', b ' and c ' of the standard saturated switch type oil injection pulse waveform data through a key point difference value calculation formula to obtain three key point difference values;
if the difference values of the three key points are within the preset difference value range, the corresponding positions of the three key points have no fault, then the saturated switch type oil injection pulse waveform data and the standard saturated switch type oil injection pulse waveform data are calculated through a total difference value calculation formula to obtain a total difference value, and if the total difference value is within the preset difference value range, the ECU oil injection driving chip has no fault; if the total difference value is not within the preset difference value range, the ECU oil injection driving chip has a fault;
if any one of the difference values of the three key points is not in the preset difference value range, the corresponding position of the key point has a fault.
2. A method of detecting a saturated switched mode fuel injector waveform based on keypoint identification as claimed in claim 1 wherein: the step (3) is specifically as follows:
the first step is as follows: arranging the saturated switch type oil injection pulse waveform data into a group of one-dimensional arrays h [ i ], and arranging two adjacent data into a group of data;
the second step is that: calculating the difference value from the 1 st group of data h 0 and h 1, i.e. | h 0-h 1 | and so on;
the third step: calculating and finding h [ j ] and h [ j +1], satisfying that | h [ j ] -h [ j +1] | is less than or equal to 1, continuously calculating each subsequent group of data until h [ j + n ] and h [ j + n +1] are found, satisfying that | h [ j + n ] -h [ j + n +1] | is more than 1, and then comparing the sizes of h [ j + n ] and h [ j + n +1 ]:
if h [ j + n ] is larger than h [ j + n +1], then h [ j + n +1] is a voltage point a for starting oil injection; again: continuing to calculate each subsequent group of data until h [ x ] and h [ x +1] are found, satisfying that | h [ x ] -h [ x +1] is less than or equal to 1, continuing to calculate each subsequent group of data until h [ x + n ] and h [ x + n +1] are found, satisfying that | h [ x + n ] -h [ x + n +1] is greater than 1, then comparing the sizes of h [ x + n ] and h [ x + n +1], if h [ x + n ] is less than h [ x + n +1] and h [ x + n +1] is greater than 30, then h [ x + n +1] is a peak voltage point b generated by stopping oil injection, and continuing to compare and calculate each subsequent group of data; if h [ x + n ] > h [ x + n +1] or h [ x + n +1] is not more than 30, then restart from Again;
if h [ j + n ] < h [ j + n +1], restarting from the second step;
the fourth step: until h [ z ] and h [ z +1] are found, h [ z ] is larger than h [ z +1], and | h [ z ] -h [ z +1] | is larger than 1, each subsequent group of data is continuously calculated until h [ z + n ] and h [ z + n +1] are found, | h [ z + n ] -h [ z + n +1] | is smaller than or equal to 1, and then h [ z + n +1] is taken as a voltage point c for recovering to the voltage of the storage battery of the fuel injector;
wherein j, n, x and z are natural numbers, x is larger than j + n +1, and z is larger than x + n + 1.
3. A method of detecting a saturated switched mode fuel injector waveform based on keypoint identification as claimed in claim 2 wherein: the standard saturated switch type oil injection pulse waveform data in the step (4) are obtained in the following mode:
the first step is as follows: collecting standard real vehicle saturation switch type oil injection pulse waveform data under the fault-free state of an ECU oil injection driving chip;
the second step is that: and extracting a complete waveform data from the standard real vehicle saturation switch type oil injection pulse waveform data to be used as the standard saturation switch type oil injection pulse waveform data.
4. A method of detecting a saturated switched mode fuel injector waveform based on keypoint identification as claimed in claim 3 wherein: after the standard saturated switch type oil injection pulse waveform data is obtained in the step (4), the method further comprises the following steps: the standard saturated switch type oil injection pulse waveform data are arranged into a group of one-dimensional arrays s [ i ], and the s [ i ] and the h [ i ] are aligned pairwise in sequence.
5. The method of key point identification based saturated switched mode fuel injector waveform detection according to claim 4, characterized by: and (4) determining three key voltage points of the standard saturation switch type oil injection pulse waveform data in the step (4), namely, respectively determining a voltage point a ' corresponding to oil injection starting in the standard saturation switch type oil injection pulse waveform data generated in the fault-free state of the ECU oil injection driving chip, a peak voltage point b ' corresponding to oil injection stopping in the standard saturation switch type oil injection pulse waveform data generated in the fault-free state of the ECU oil injection driving chip, and a voltage point c ' corresponding to voltage recovered to the oil injector storage battery in the standard saturation switch type oil injection pulse waveform data generated in the fault-free state of the ECU oil injection driving chip.
6. The method for detecting a saturated switched mode fuel injector waveform based on keypoint identification according to claim 5, characterized in that: the key point difference value calculation formula in the step (5) is as follows:
|x-y|
wherein x is a or b or c; y is a ' or b ' or c '; the difference values of the three key points are respectively: the value obtained by calculation when x is a and y is a ', the value obtained by calculation when x is b and y is b ', and the value obtained by calculation when x is c and y is c '.
7. The method of key point identification based saturated switched mode fuel injector waveform detection according to claim 6, characterized by: the total difference value calculation formula in the step (5) is a Pearson correlation coefficient calculation formula:
Figure FDA0002650710510000031
wherein n is the number of the saturated switch type oil injection pulse data or the standard saturated switch type oil injection pulse data, and the two are the same; x is the number ofiIs h [ i ]]The ith data;
Figure FDA0002650710510000032
is h [ i ]]Average value of (d); y isiIs s [ i ]]The ith data;
Figure FDA0002650710510000033
is s [ i ]]Average value of (a).
8. A method of detecting a saturated switched mode fuel injector waveform based on keypoint identification as claimed in claim 7 wherein: in the step (5), the difference value is not more than 1 within a preset difference value range, and is not more than 1 within the preset difference value range.
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