CN111966079B - Saturated switch type oil sprayer waveform detection method based on key point identification - Google Patents
Saturated switch type oil sprayer waveform detection method based on key point identification Download PDFInfo
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- 229920006395 saturated elastomer Polymers 0.000 title claims abstract description 101
- 238000001514 detection method Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 18
- 238000002347 injection Methods 0.000 claims description 142
- 239000007924 injection Substances 0.000 claims description 142
- 239000000446 fuel Substances 0.000 claims description 36
- 238000003491 array Methods 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 2
- 238000005507 spraying Methods 0.000 abstract 5
- 238000010586 diagram Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
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Classifications
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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
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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
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24065—Real time diagnostics
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- 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 saturated switch type oil sprayer waveform detection method based on key point identification relates to the technical field of fault detection of an ECU of an automobile engine and comprises five steps, processing is carried out according to the five steps, firstly saturated switch type oil spraying pulse waveform data is obtained, then a key point difference value calculation formula and a total difference value calculation formula are used, 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 are calculated, whether an ECU oil spraying driving chip has faults or not is judged according to the two difference values, whether the corresponding position of the key point has faults or not is judged, judgment by a direct observation method is not needed, and even if the condition that the waveform to be detected is similar to the standard saturated switch type oil spraying pulse waveform and the waveform of the amplitude is different, the waveform data of the two are different. The invention converts waveform judgment into waveform data judgment, so that the relative error of fault detection is smaller.
Description
Technical Field
The invention relates to the technical field of fault detection of an ECU (electronic control unit) of an automobile engine, in particular to a saturated switch type oil sprayer waveform detection method based on key point identification.
Background
With the development of high integration of an ECU of an automobile engine, the difficulty of fault diagnosis of an ECU oil injection driving chip is higher and higher. How to simply, conveniently and accurately identify the faults of an ECU oil injection driving chip is a troublesome problem which needs to be solved by automobile ECU manufacturers. The traditional detection technology relies on a voltmeter to measure the voltage of the ECU pins to be detected in real time so as to find out the fault position, 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 saturated switch type oil injection pulse is an important output signal of an engine ECU oil injection driving chip, the problems can be effectively solved by combining the saturated switch type oil injection pulse and adopting a waveform detection method, namely, the time-voltage waveform of the corresponding saturated switch type oil injection pulse is displayed through an oscilloscope after the saturated switch type oil injection pulse waveform data are acquired, whether the waveform is normal or not is checked by adopting a method of directly observing the waveform manually, however, the method requires maintenance personnel to know the key characteristics and the shape of the standard saturated switch type oil injection pulse waveform, and the method is difficult to detect under the conditions that the waveform to be detected is similar to the standard saturated switch type oil injection pulse waveform and the amplitude is different, so that the error generated by the method of judging the fault by measuring the waveform through the direct observation method is relatively large.
Disclosure of Invention
In view of the above, it is necessary to provide a waveform detection method of a saturated switch type fuel injector based on key point identification instead of judging a failure by a direct observation method.
A saturated switch type oil sprayer waveform detection method based on key point identification comprises the following steps:
(1) Selecting an ECU to be detected, collecting actual vehicle saturated switch type oil injection pulse waveform data, filtering the waveform data, wherein the actual vehicle saturated switch type oil injection pulse waveform data is voltage data;
(2) Extracting complete waveform data from the actual vehicle saturated switch type oil injection pulse waveform data as saturated switch type oil injection pulse waveform data;
(3) Three key voltage points of saturated switch type oil injection pulse waveform data are extracted: a voltage point a for starting fuel injection, a peak voltage point b for stopping fuel injection and a voltage point c for recovering the voltage of a storage battery of the fuel injector;
(4) The method comprises the steps of obtaining standard saturated switch type oil injection pulse waveform data, and extracting three key voltage points of the standard saturated switch type oil injection pulse waveform data, wherein the three key voltage points are respectively as follows: a voltage point a ' for starting fuel injection, a peak voltage point b ' for stopping fuel injection, and a voltage point c ' for recovering the voltage of the storage battery of the fuel 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 respectively 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 in the preset difference value range, the corresponding positions of the three key points have no faults, 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 in the preset difference value range, the ECU oil injection driving chip has no faults; if the total difference value is not in the preset difference value range, the ECU fuel injection driving chip has faults;
if any one of the three key point differences is not in the preset difference range, the corresponding position of the key point has a fault.
Preferably, the step (3) specifically comprises:
the first step: the saturated switch type oil injection pulse waveform data are listed as a group of one-dimensional arrays h [ i ], and two adjacent data are taken as a group of data;
and a second step of: performing a difference calculation starting from the 1 st set of data h 0 and h 1, i.e., |h0-h 1|, and so on;
and a third step of: calculating and finding h [ j ] and h [ j+1], meeting the condition that |h [ j ] -h [ j+1] | is less than or equal to 1, continuing calculating each subsequent group of data until h [ j+n ] and h [ j+n+1] are found, meeting the condition that |h [ j+n ] -h [ j+n+1] | > 1, and comparing the sizes of h [ j+n ] and h [ j+n+1 ]:
if hj+n > hj+n+1, h j+n+1 is the voltage point a for starting oil injection; again: continuing to calculate each subsequent set of data until hx and hx+1 are found, meeting the condition that |hx-hx+1| is less than or equal to 1, continuing to calculate each subsequent set of data until hx+n and hx+n+1 are found, meeting the condition that |hx+n-hx+n+1| > 1, then comparing the magnitudes of hx+n and hx+n+1, and if hx+n is less than hx+n+1 and hx+n+1 is greater than 30, h x+n+1 is a peak voltage point b generated by stopping oil injection, and continuing to compare and calculate each subsequent set of data; if hx+n > hx+n+1 or hx+n+1 is no more than 30, restarting from Again;
if hj+n is less than hj+n+1, restarting from the second step;
fourth step: until h [ z ] and h [ z+1] are found, satisfying h [ z ] > h [ z+1], and |hz ] -h [ z+1] | > 1, continuing to calculate each subsequent set of data until h [ z+n ] and h [ z+n+1] are found, satisfying |hz+n ] -h [ z+n+1] | is less than or equal to 1, and taking h [ z+n+1] as a voltage point c recovered to the fuel injector storage battery voltage;
wherein j, n, x, z is a natural number, x > j+n+1, and z > x+n+1.
Preferably, the standard saturated switch type fuel injection pulse waveform data in the step (4) is obtained by the following steps:
the first step: collecting standard real-vehicle saturated switch type oil injection pulse waveform data in a fault-free state of an ECU oil injection driving chip;
and a second step of: and extracting complete waveform data from the standard actual vehicle saturated switch type oil injection pulse waveform data to serve as standard saturated switch type oil injection pulse waveform data.
Preferably, after the standard saturated switch type fuel injection pulse waveform data is obtained in the step (4), the method further comprises the steps of: the standard saturated switch type oil injection pulse waveform data are listed as a group of one-dimensional arrays s [ i ], and s [ i ] and h [ i ] are aligned pairwise in sequence.
Preferably, three key voltage points of the standard saturated switch type fuel injection pulse waveform data in the step (4) are determined values, namely, a voltage point a ' corresponding to start fuel injection in the standard saturated switch type fuel injection pulse waveform data generated in the non-fault state of the ECU fuel injection driving chip, a peak voltage point b ' corresponding to stop fuel injection in the standard saturated switch type fuel injection pulse waveform data generated in the non-fault state of the ECU fuel injection driving chip, and a voltage point c ' corresponding to return to the voltage of the fuel injector storage battery in the standard saturated switch type fuel injection pulse waveform data generated in the non-fault state of the ECU fuel injection driving chip.
Preferably, the calculation formula of the key point difference value 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 three key point differences are respectively: calculating the obtained numerical value when x is a and y is a ', calculating the obtained numerical value when x is b and y is b ', and calculating the obtained numerical value when x is c and y is c '.
Preferably, the total difference calculation formula in the step (5) is a pearson correlation coefficient calculation formula:
wherein n is the number of saturated switch type oil injection pulse waveform data or standard saturated switch type oil injection pulse waveform data, and the two are the same; x is x i Is h [ i ]]I data of (a);is h [ i ]]Average value of (2); y is i Is s [ i ]]I data of (a); />Is s [ i ]]Average value of (2).
Preferably, in step (5), the value is not greater than 1 within the predetermined difference range, and is not greater than 1 within the predetermined difference range.
The invention adopts the technical proposal and has the beneficial effects that: according to the processing of the steps (1) - (5), saturated switch type oil injection pulse waveform data are firstly obtained, then a key point difference value calculation formula and a total difference value calculation formula are used, the key point difference value and the total difference value of standard saturated switch type oil injection pulse waveform data and saturated switch type oil injection pulse waveform data are calculated, whether an ECU oil injection driving chip has faults or not is judged according to the two difference values, whether the corresponding position of the key point has faults or not is judged, the waveform is not required to be measured manually through a direct observation method for judgment, and even if the condition that the waveform to be detected is similar to the standard saturated switch type oil injection pulse waveform and the waveform is different in amplitude value, the waveform data of the two are different. The invention converts waveform judgment into waveform data judgment, so that the relative error of fault detection is smaller.
Drawings
FIG. 1 is a flow chart of a method of waveform detection for a saturated switch mode fuel injector based on key point identification.
Fig. 2 is a flow chart of three key voltage point extraction methods.
FIG. 3 is a waveform chart of the waveform data of the fuel injection pulse of the real-vehicle saturated switch type after being collected and filtered and displayed by an oscilloscope;
fig. 4 is a waveform diagram of extracting one complete waveform data in fig. 1 and displaying the waveform data through an oscilloscope, namely, a waveform diagram of saturated switch type oil injection pulse waveform data and displaying the waveform data through the oscilloscope, and indicates the 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 that are needed 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 other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Referring to fig. 1, an embodiment of the present invention provides a method comprising the steps of:
and S01, selecting an ECU to be detected, connecting the ECU by using a data acquisition card, acquiring actual vehicle saturated switch type oil injection pulse waveform data, and performing five-point three-time smoothing filter processing on the waveform data, wherein the actual vehicle saturated switch type oil injection pulse waveform data is voltage data.
And step S02, extracting complete waveform data from the actual saturated switch type oil injection pulse waveform data as saturated switch type oil injection pulse waveform data, wherein the actual saturated switch type oil injection pulse waveform data is formed by continuously forming a predetermined number of saturated switch type oil injection pulse waveform data.
Step S03, extracting three key voltage points of saturated switch type oil injection pulse waveform data:
the first step: the saturated switch type oil injection pulse waveform data are listed as a group of one-dimensional arrays h [ i ], and two adjacent data are taken as a group of data;
and a second step of: performing a difference calculation starting from the 1 st set of data h 0 and h 1, i.e., |h0-h 1|, and so on;
and a third step of: calculating and finding h [ j ] and h [ j+1], meeting the condition that |h [ j ] -h [ j+1] | is less than or equal to 1, continuing calculating each subsequent group of data until h [ j+n ] and h [ j+n+1] are found, meeting the condition that |h [ j+n ] -h [ j+n+1] | > 1, and comparing the sizes of h [ j+n ] and h [ j+n+1 ]:
if hj+n > hj+n+1, h j+n+1 is the voltage point a for starting oil injection; again: continuing to calculate each subsequent set of data until hx and hx+1 are found, meeting the condition that |hx-hx+1| is less than or equal to 1, continuing to calculate each subsequent set of data until hx+n and hx+n+1 are found, meeting the condition that |hx+n-hx+n+1| > 1, then comparing the magnitudes of hx+n and hx+n+1, and if hx+n is less than hx+n+1 and hx+n+1 is greater than 30, h x+n+1 is a peak voltage point b generated by stopping oil injection, and continuing to compare and calculate each subsequent set of data; if hx+n > hx+n+1 or hx+n+1 is no more than 30, restarting from Again;
if hj+n is less than hj+n+1, restarting from the second step;
fourth step: until h [ z ] and h [ z+1] are found, satisfying h [ z ] > h [ z+1], and |hz ] -h [ z+1] | > 1, continuing to calculate each subsequent set of data until h [ z+n ] and h [ z+n+1] are found, satisfying |hz+n ] -h [ z+n+1] | is less than or equal to 1, and taking h [ z+n+1] as a voltage point c recovered to the fuel injector storage battery voltage;
wherein j, n, x, z is a natural number, x > j+n+1, and z > x+n+1.
Step S04, obtaining standard saturated switch type oil injection pulse waveform data:
the first step: collecting standard real-vehicle saturated switch type oil injection pulse waveform data in a fault-free state of an ECU oil injection driving chip;
and a second step of: and extracting complete waveform data from the standard actual vehicle saturated switch type oil injection pulse waveform data to serve as standard saturated switch type oil injection pulse waveform data, wherein the standard actual vehicle saturated switch type oil injection pulse waveform data is formed by continuously forming a preset number of standard saturated switch type oil injection pulse waveform data.
And a third step of: after the standard saturated switch type oil injection pulse waveform data is obtained, the standard saturated switch type oil injection pulse waveform data is listed as a group of one-dimensional arrays s [ i ], s [ i ] and h [ i ] are aligned in pairs according to the sequence, and the data quantity of s [ i ] and h [ i ] is the same.
Step S05, extracting three key voltage points of standard saturated switch type oil injection pulse waveform data, wherein the three key voltage points are determined values respectively as follows: voltage point a ' of starting oil injection corresponding to the standard saturated switch type oil injection pulse waveform data generated in the non-fault state of the ECU oil injection driving chip, peak voltage point b ' of stopping oil injection corresponding to the standard saturated switch type oil injection pulse waveform data generated in the non-fault state of the ECU oil injection driving chip, and voltage point c ' of recovering to the accumulator voltage of the oil injector corresponding to the standard saturated switch type oil injection pulse waveform data generated in the non-fault state of the ECU oil injection driving chip.
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 respectively 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, no fault exists at the corresponding positions of the three key points, 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, no fault exists in the ECU oil injection driving chip; if the total difference is greater than 1, the ECU oil injection driving chip has faults;
if any one of the three key point differences is larger than 1, the corresponding position of the key point has a fault.
The calculation formula of the key point difference value is as follows:
|x-y|
wherein x is a or b or c; y is a ' or b ' or c '; the three key point differences are respectively: calculating the obtained numerical value when x is a and y is a ', calculating the obtained numerical value when x is b and y is b ', and calculating the obtained numerical value when x is c and y is c '.
The calculation result of the key point difference calculation formula corresponds to the fault and is shown in table 1:
TABLE 1
The total difference value calculation formula is a pearson correlation coefficient calculation formula:
wherein n is the number of saturated switch type oil injection pulse waveform data or standard saturated switch type oil injection pulse waveform data, and the two are the same; x is x i Is h [ i ]]I data of (a);is h [ i ]]Average value of (2); y is i Is s [ i ]]I data of (a); />Is s [ i ]]Average value of (2).
Further, another alternative of step S02 is:
the first step: selecting a standard oil injection pulse template, wherein the standard oil injection pulse template is one complete waveform data in oil injection pulse waveform data of an ECU oil injection driving chip in a fault-free state, and the oil injection pulse waveform data of the ECU oil injection driving chip in the fault-free state is continuously formed by a preset number of standard oil injection pulse templates;
and a second step of: the filtered data of the saturated switch type oil injection pulse waveform of the real vehicle is listed as a group of one-dimensional arrays m [ j ]]The standard oil injection pulse die plate is arranged into a one-dimensional array n [ i ]]Determining m [ j ]]The number of data of (1) m Determining n [ i ]]The number of data of (1) n Where j is less than or equal to l m -l n -1, carrying out subsequent step treatment on the premise of carrying out the subsequent step treatment;
and a third step of: will m 0]And n < 0]]Calculating difference value by means of square calculation formula of difference, and making m 1]And n 1]Calculating the difference by a square calculation formula of the difference, and the like, calculating to m [ l ] n ]And n [ l ] n ]Accumulating and summing all the calculated difference values;
fourth, m 1]And n < 0]]Calculating difference value by means of square calculation formula of difference, and making m 2]And n 1]Calculating the difference by a square calculation formula of the difference, and the like, calculating to m [ l ] n +1]And n [ l ] n ]Accumulating and summing all the calculated difference values;
fifth step: according to the sequence of the first step and the second step, the accumulated sums obtained by all the calculation are listed as a group of one-dimensional arrays sum [ j ];
sixth step: finding the minimum value in sum [ j ] and satisfying the minimum value not more than 1;
seventh step: the minimum value is sum [ j ]]The corresponding element subscript of the element is m [ j ] after extraction]Starting point element subscript k of medium saturation switch type oil injection pulse waveform data is m [ j ]]In m [ k ]]Taking l backward in order as starting point element n And (3) taking the element as saturated switch type oil injection pulse waveform data.
Wherein, the square calculation formula of the difference is:
(x-y) 2
the foregoing disclosure is illustrative of the preferred embodiments of the present invention, and is not to be construed as limiting the scope of the invention, as it is understood by those skilled in the art that all or part of the above-described embodiments may be practiced with equivalents thereof, which fall within the scope of the invention as defined by the appended claims.
Claims (6)
1. A saturated switch type oil sprayer waveform detection method based on key point identification is characterized in that: the method comprises the following steps:
(1) Selecting an ECU to be detected, collecting actual vehicle saturated switch type oil injection pulse waveform data, filtering the waveform data, wherein the actual vehicle saturated switch type oil injection pulse waveform data is voltage data;
(2) Extracting complete waveform data from the actual vehicle saturated switch type oil injection pulse waveform data as saturated switch type oil injection pulse waveform data;
(3) Three key voltage points of saturated switch type oil injection pulse waveform data are extracted: a voltage point a for starting fuel injection, a peak voltage point b for stopping fuel injection and a voltage point c for recovering the voltage of a storage battery of the fuel injector;
(4) The method comprises the steps of obtaining standard saturated switch type oil injection pulse waveform data, and extracting three key voltage points of the standard saturated switch type oil injection pulse waveform data, wherein the three key voltage points are respectively as follows: a voltage point a ' for starting fuel injection, a peak voltage point b ' for stopping fuel injection, and a voltage point c ' for recovering the voltage of the storage battery of the fuel 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 respectively through a key point difference value calculation formula to obtain three key point difference values;
the calculation formula of the key point difference value is as follows:
|x-y|
wherein x is a or b or c; y is a ' or b ' or c '; the three key point differences are respectively: calculating the obtained numerical value when x is a and y is a ', calculating the obtained numerical value when x is b and y is b ', and calculating the obtained numerical value when x is c and y is c '; if the difference value of the three key points is in the preset difference value range, the corresponding positions of the three key points have no faults, 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 in the preset difference value range, the ECU oil injection driving chip has no faults; if the total difference value is not in the preset difference value range, the ECU fuel injection driving chip has faults; the total difference value calculation formula is a pearson correlation coefficient calculation formula:
wherein n is the number of saturated switch type oil injection pulse data or standard saturated switch type oil injection pulse data, and the two are the same; x is x i Is h [ i ]]I data of (a);is h [ i ]]Average value of (2); y is i Is s [ i ]]I data of (a); />Is s [ i ]]Average value of (2);
if any one of the three key point differences is not in the preset difference range, the corresponding position of the key point has a fault.
2. The saturation switch mode fuel injector waveform detection method based on key point identification as set forth in claim 1, wherein: the step (3) specifically comprises the following steps:
the first step: the saturated switch type oil injection pulse waveform data are listed as a group of one-dimensional arrays h [ i ], and two adjacent data are taken as a group of data;
and a second step of: performing a difference calculation starting from the 1 st set of data h 0 and h 1, i.e., |h0-h 1|, and so on;
and a third step of: calculating and finding h [ j ] and h [ j+1], meeting the condition that |h [ j ] -h [ j+1] | is less than or equal to 1, continuing calculating each subsequent group of data until h [ j+n ] and h [ j+n+1] are found, meeting the condition that |h [ j+n ] -h [ j+n+1] | > 1, and comparing the sizes of h [ j+n ] and h [ j+n+1 ]:
if hj+n > hj+n+1, h j+n+1 is the voltage point a for starting oil injection;
continuing to calculate each subsequent set of data until hx and hx+1 are found, meeting the condition that |hx-hx+1| is less than or equal to 1, continuing to calculate each subsequent set of data until hx+n and hx+n+1 are found, meeting the condition that |hx+n-hx+n+1| > 1, then comparing the magnitudes of hx+n and hx+n+1, and if hx+n is less than hx+n+1 and hx+n+1 is greater than 30, h x+n+1 is a peak voltage point b generated by stopping oil injection, and continuing to compare and calculate each subsequent set of data;
if hx+n > hx+n+1 or hx+n+1 is no more than 30, then executing "continue to calculate subsequent data of each group until hx and hx+1 are found, satisfying |hx-hx+1| less than or equal to 1, continue to calculate subsequent data of each group until hx+n and hx+n+1 are found, satisfying |hx+n-hx+n+1| more than 1, then comparing magnitudes of hx+n and hx+n+1, if hx+n is less than hx+n+1, and hx+n+1 is greater than 30, h x+n+1 is peak voltage point b generated by stopping oil injection, and continuing to compare and calculate subsequent data of each group; a step;
if hj+n is less than hj+n+1, restarting from the second step;
fourth step: until h [ z ] and h [ z+1] are found, satisfying h [ z ] > h [ z+1], and |hz ] -h [ z+1] | > 1, continuing to calculate each subsequent set of data until h [ z+n ] and h [ z+n+1] are found, satisfying |hz+n ] -h [ z+n+1] | is less than or equal to 1, and taking h [ z+n+1] as a voltage point c recovered to the fuel injector storage battery voltage;
wherein j, n, x, z is a natural number, x > j+n+1, and z > x+n+1.
3. The saturation switch mode fuel injector waveform detection method based on key point identification as set forth in claim 2, wherein: the standard saturated switch type oil injection pulse waveform data in the step (4) are obtained in the following way:
the first step: collecting standard real-vehicle saturated switch type oil injection pulse waveform data in a fault-free state of an ECU oil injection driving chip;
and a second step of: and extracting complete waveform data from the standard actual vehicle saturated switch type oil injection pulse waveform data to serve as standard saturated switch type oil injection pulse waveform data.
4. The saturation switch mode fuel injector waveform detection method based on key point identification of 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 steps of: the standard saturated switch type oil injection pulse waveform data are listed as a group of one-dimensional arrays s [ i ], and s [ i ] and h [ i ] are aligned pairwise in sequence.
5. The method for detecting the waveform of the saturated switch mode oil sprayer based on the key point identification as defined in claim 4, wherein the method comprises the following steps: and (3) the three key voltage points of the standard saturated switch type oil injection pulse waveform data in the step (4) are determined values, namely, the voltage point a ' of starting oil injection corresponding to the standard saturated switch type oil injection pulse waveform data generated in the non-fault state of the ECU oil injection driving chip, the peak voltage point b ' of stopping oil injection corresponding to the standard saturated switch type oil injection pulse waveform data generated in the non-fault state of the ECU oil injection driving chip and the voltage point c ' of recovering to the voltage of the storage battery of the oil injector corresponding to the standard saturated switch type oil injection pulse waveform data generated in the non-fault state of the ECU oil injection driving chip.
6. The saturation switch mode fuel injector waveform detection method based on key point identification as set forth in claim 1, wherein: and (3) in the step (5), the value is not more than 1 in the preset difference range, and is not more than 1 in the preset difference range.
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