CN117189399A - Rail pressure-based oil sprayer fault diagnosis method and device, storage medium and processor - Google Patents
Rail pressure-based oil sprayer fault diagnosis method and device, storage medium and processor Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 58
- 238000003745 diagnosis Methods 0.000 title claims abstract description 40
- 238000003860 storage Methods 0.000 title claims abstract description 24
- 239000000446 fuel Substances 0.000 claims abstract description 142
- 230000008859 change Effects 0.000 claims abstract description 100
- 238000002347 injection Methods 0.000 claims abstract description 89
- 239000007924 injection Substances 0.000 claims abstract description 89
- 238000004364 calculation method Methods 0.000 claims description 26
- 230000009467 reduction Effects 0.000 claims description 19
- 230000000630 rising effect Effects 0.000 claims description 7
- 230000003111 delayed effect Effects 0.000 claims description 3
- 230000002159 abnormal effect Effects 0.000 abstract description 11
- 230000008569 process Effects 0.000 abstract description 11
- 238000009825 accumulation Methods 0.000 abstract description 10
- 239000008188 pellet Substances 0.000 abstract description 5
- 230000000903 blocking effect Effects 0.000 abstract description 4
- 239000003921 oil Substances 0.000 description 114
- 238000010586 diagram Methods 0.000 description 13
- 238000004590 computer program Methods 0.000 description 9
- 230000006870 function Effects 0.000 description 5
- 230000001052 transient effect Effects 0.000 description 4
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- 238000005259 measurement Methods 0.000 description 3
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- 230000005540 biological transmission Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000010727 cylinder oil Substances 0.000 description 2
- 239000002283 diesel fuel Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 241001529739 Prunella <angiosperm> Species 0.000 description 1
- 239000010724 circulating oil Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 235000008113 selfheal Nutrition 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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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
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Abstract
The application discloses a rail pressure-based oil sprayer fault diagnosis method, a rail pressure-based oil sprayer fault diagnosis device, a storage medium and a processor, wherein the rail pressure-based oil sprayer fault diagnosis method comprises the following steps of: collecting real-time rail pressure data and oil injection quantity of each oil injector of a current diesel engine in a working cycle; acquiring the cylinder number of a current diesel engine, and calculating a rail pressure change coefficient of the current fuel injector aiming at the current fuel injector based on the cylinder number, real-time rail pressure data and fuel injection quantity; and comparing the rail pressure change coefficient with a preset rail pressure change threshold value, and judging that the current fuel injector has faults under the condition that the rail pressure change coefficient is larger than the preset rail pressure change threshold value. According to the process, whether the oil sprayer has faults or not is determined based on the rail pressure change coefficient, and the problems that when the oil sprayer is blocked at the closed position due to the blocking protection of the oil sprayer by adopting hardware, the protection cannot be realized, the oil sprayer is cut off due to large oil injection quantity, self-reset cannot be realized, the oil injection quantity is changed quickly, the pressure of an accumulation cavity is changed quickly, abnormal seating of pellets is caused, and abnormal closing of injection is caused are avoided.
Description
Technical Field
The application relates to the technical field of fault diagnosis, in particular to a rail pressure-based oil sprayer fault diagnosis method, a rail pressure-based oil sprayer fault diagnosis device, a storage medium and a processor.
Background
The injector may be stuck in a certain position due to foreign matters, faults of an electromagnetic switch in the injector, and the like; if the clamping is in the closed position, the fuel injector is normally closed, and the fuel supply of a single cylinder is stopped, so that the problems of uneven combustion, fluctuation of rotating speed and the like of each cylinder can be caused; if the clamping is in the 'open' position, the fuel injector is normally open, the single cylinder continuously supplies fuel, so that the problems of black smoke, rise in single cylinder exhaust temperature, fluctuation in rotating speed and the like can be caused, and serious consequences such as runaway, galloping and the like of the diesel engine can be caused;
in the prior art, the hardware-based oil sprayer is adopted for clamping stagnation protection, as shown in fig. 1, when the oil injection quantity is too large or the oil injection is too long, the pressure of the pressure accumulation cavity is greatly reduced, the inlet pressure of the oil sprayer is larger than the pressure of the pressure accumulation cavity, the pressure of the small ball customer service spring can be pushed to descend to the ball seat, the oil supply of the oil sprayer is cut off, and finally the protection of the diesel engine is realized.
However, the structure can only realize the protection of the diesel engine when the fuel injector is blocked at the opening position, and can not realize the protection when the fuel injector is blocked at the closing position; secondly, this structure is because the oil spout volume is big leads to the sprayer to cut off, can't reset by oneself, need carry out the pressure release to the oil feed end of sprayer and just can reset, moreover, under transient state operating mode such as diesel engine sudden loading, because the oil spout volume change is very fast, can lead to the pressure in pressure accumulation chamber to change rapidly, leads to the ball to be abnormally seated, sprays unusual closing, and the diesel engine can't detect the trouble this moment, also can't reset by oneself self-healing, leads to causing the puzzlement to the user.
Disclosure of Invention
In view of the above, the application provides a rail pressure-based fault diagnosis method, a rail pressure-based fault diagnosis device, a storage medium and a rail pressure-based fault diagnosis processor for solving the problems that in the prior art, the protection of a diesel engine can only be realized when the oil injector is stuck in an 'open' position, and the protection can not be realized when the oil injector is stuck in an 'closed' position; secondly, this structure is because the oil spout volume is big leads to the sprayer to cut off, can't reset by oneself, need carry out the pressure release to the oil feed end of sprayer and just can reset, moreover, under transient state operating mode such as diesel engine suddenly loaded, because the oil spout volume change is very fast, can lead to the pressure in pressure accumulation chamber to change rapidly, leads to the ball to be abnormally seated, sprays unusual closing, and the diesel engine can't detect the trouble this moment, also can't reset by oneself self-healing, leads to the problem that causes the puzzlement to the user. The specific scheme is as follows:
a fault diagnosis method of an oil injector based on rail pressure comprises the following steps:
collecting real-time rail pressure data and oil injection quantity of each oil injector of a current diesel engine in a working cycle;
acquiring the cylinder number of the current diesel engine, and calculating a rail pressure change coefficient of the current fuel injector aiming at the current fuel injector based on the cylinder number, the real-time rail pressure data and the fuel injection quantity;
comparing the rail pressure change coefficient with a preset rail pressure change threshold value;
and under the condition that the rail pressure change coefficient is larger than the preset rail pressure change threshold value, judging that the current fuel injector has faults.
In the above method for diagnosing a fault of an injector based on rail pressure, optionally, for a current injector, calculating a rail pressure change coefficient of the current injector based on the cylinder number, the real-time rail pressure data and the injection quantity includes:
calculating a rail pressure reduction coefficient based on the cylinder number, the fuel injection amount, and the real-time rail pressure data;
calculating a rail pressure elevation coefficient based on the cylinder number and the real-time rail pressure data;
and respectively calculating absolute values of the rail pressure reduction coefficient and the difference value between the rail pressure increase coefficient and 1 to obtain a first coefficient and a second coefficient, and selecting the maximum value of the first coefficient and the second coefficient as a rail pressure change coefficient.
In the above method for diagnosing a fault of an injector based on rail pressure, optionally, calculating a rail pressure reduction coefficient based on the cylinder number, the injection quantity, and the real-time rail pressure data includes:
obtaining target rail pressure data and target oil injection quantity of the current rail pressure device, wherein the target rail pressure data comprises: the method comprises the steps of enabling a first common rail pressure at the opening moment of a current oil injector, a second common rail pressure at the closing moment of the current oil injector and a third common rail pressure of the current oil injector after closing delay;
calculating a pressure difference value between the first common rail pressure and the second common rail pressure, and taking a ratio of the pressure difference value to the target fuel injection quantity as a first parameter;
for each fuel injector, calculating the ratio of the difference value of the common rail pressure at the opening time of the fuel injector and the common rail pressure at the closing time of the fuel injector to the corresponding fuel injection quantity based on the real-time rail pressure data and the fuel injection quantity respectively to obtain each second parameter, and taking the ratio of the sum of each second parameter to the cylinder number as a third parameter;
and taking the ratio of the first parameter to the third parameter as a rail pressure reduction coefficient.
The above-mentioned fuel injector fault diagnosis method based on rail pressure, optionally, calculates a rail pressure increase coefficient based on the cylinder number and the real-time rail pressure data, including:
calculating a first pressure difference between the third rail pressure and the second rail pressure;
for each fuel injector, respectively calculating each second pressure difference value of the common rail pressure of the fuel injector after closing delay and the common rail pressure of the fuel injector at the closing moment based on the real-time rail pressure data, and taking the ratio of each second pressure difference value to the cylinder number as a third pressure difference value;
and taking the ratio of the first pressure difference value to the third pressure difference value as a rail pressure drop rising coefficient.
The above oil sprayer fault diagnosis method based on rail pressure, optionally, further comprises:
counting the occurrence times of the condition that the rail pressure change coefficient is larger than the preset rail pressure change threshold value continuously;
and under the condition that the occurrence frequency is larger than a preset occurrence frequency threshold value, performing active oil control operation.
The above oil sprayer fault diagnosis method based on rail pressure, optionally, further comprises: and under the condition that the rail pressure change coefficient is larger than the preset rail pressure change threshold value, judging that the current fuel injector has faults, wherein the method comprises the following steps:
if the first coefficient is the rail pressure change coefficient, judging that the current fuel injector has a normally open fault;
and if the second coefficient is the rail pressure change coefficient, judging that the normally closed fault exists in the current fuel injector.
A rail pressure based fuel injector fault diagnostic apparatus comprising:
the acquisition module is used for acquiring real-time rail pressure data and oil injection quantity of each oil injector of the current diesel engine in one working cycle;
the acquisition and calculation module is used for acquiring the cylinder number of the current diesel engine, and calculating a rail pressure change coefficient of the current fuel injector aiming at the current fuel injector based on the cylinder number, the real-time rail pressure data and the fuel injection quantity;
the comparison module is used for comparing the rail pressure change coefficient with a preset rail pressure change threshold value;
and the judging module is used for judging that the current fuel injector has faults under the condition that the rail pressure change coefficient is larger than the preset rail pressure change threshold value.
In the above fuel injector fault diagnosis device based on rail pressure, optionally, the obtaining and calculating module includes:
a first calculation unit configured to calculate a rail pressure reduction coefficient based on the cylinder number, the injection amount, and the real-time rail pressure data;
a second calculation unit configured to calculate a rail pressure increase coefficient based on the cylinder number and the real-time rail pressure data;
and the calculating and selecting unit is used for respectively calculating absolute values of the rail pressure reduction coefficient and the difference value between the rail pressure increase coefficient and 1 to obtain a first coefficient and a second coefficient, and selecting the maximum value of the first coefficient and the second coefficient as a rail pressure change coefficient.
In the above-mentioned rail pressure-based fuel injector fault diagnosis device, optionally, the first calculation unit includes:
the acquisition subunit is used for acquiring target rail pressure data and target oil injection quantity of the current rail pressure device, wherein the target rail pressure data comprises: the method comprises the steps of enabling a first common rail pressure at the opening moment of a current oil injector, a second common rail pressure at the closing moment of the current oil injector and a third common rail pressure of the current oil injector after closing delay;
a first calculation subunit, configured to calculate a pressure difference between the first common rail pressure and the second common rail pressure, and take a ratio of the pressure difference to the target fuel injection amount as a first parameter;
the second calculating subunit is used for respectively calculating the ratio of the difference value of the common rail pressure at the opening time of the oil injector and the common rail pressure at the closing time of the oil injector to the corresponding oil injection quantity based on the real-time rail pressure data and the oil injection quantity for each oil injector to obtain each second parameter, and taking the ratio of the sum of each second parameter to the cylinder number as a third parameter;
and the first determination subunit is used for taking the ratio of the first parameter to the third parameter as a rail pressure reduction coefficient.
In the above-mentioned rail pressure-based fuel injector fault diagnosis device, optionally, the second calculation unit includes:
a third calculation subunit, configured to calculate a first pressure difference value between the third common rail pressure and the second common rail pressure;
a fourth calculation subunit, configured to calculate, for each fuel injector, respective second pressure differences of the fuel injector with respect to the rail pressure of the fuel injector delayed by closing and the rail pressure of the fuel injector at the closing time based on the real-time rail pressure data, and take a ratio of the respective second differences to the cylinder number as a third pressure difference;
a second determination subunit, configured to take a ratio of the first pressure difference value and the third pressure difference value as a rail pressure drop rising coefficient.
A storage medium comprising a stored program, wherein the program performs the rail pressure-based fuel injector fault diagnosis method described above.
The processor is used for running a program, wherein the program runs to execute the rail pressure-based oil sprayer fault diagnosis method.
Compared with the prior art, the application has the following advantages:
the application discloses a rail pressure-based oil sprayer fault diagnosis method, a rail pressure-based oil sprayer fault diagnosis device, a storage medium and a processor, wherein the rail pressure-based oil sprayer fault diagnosis method comprises the following steps of: collecting real-time rail pressure data and oil injection quantity of each oil injector of a current diesel engine in a working cycle; acquiring the cylinder number of a current diesel engine, and calculating a rail pressure change coefficient of the current fuel injector aiming at the current fuel injector based on the cylinder number, real-time rail pressure data and fuel injection quantity; and comparing the rail pressure change coefficient with a preset rail pressure change threshold value, and judging that the current fuel injector has faults under the condition that the rail pressure change coefficient is larger than the preset rail pressure change threshold value. According to the process, whether the oil sprayer has faults or not is determined based on the rail pressure change coefficient, and the problems that in the prior art, when the oil sprayer is blocked at the closed position due to the blocking protection of the oil sprayer by adopting hardware, the protection cannot be realized, the oil sprayer is cut off due to large oil injection quantity, self-reset cannot be realized, the oil injection quantity is changed quickly, the pressure of an accumulation cavity is changed quickly, abnormal seating of pellets is caused, and abnormal closing of injection is caused are avoided.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a hardware injector stuck protection device in the prior art;
FIG. 2 is a flow chart of a fault diagnosis method for an injector based on rail pressure according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a real-time rail pressure measured value and a power-on signal of an injector according to an embodiment of the present application;
FIG. 4 is a schematic diagram of rail pressure fluctuation of a single cylinder according to an embodiment of the present application;
FIG. 5 is a block diagram of a fault diagnosis device for a fuel injector based on rail pressure according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of an apparatus according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The application discloses a rail pressure-based fault diagnosis method and device for an oil sprayer, a storage medium and a processor, which are applied to judging the fault of the oil sprayer according to the rail pressure change of a high-pressure common rail diesel engine, triggering protection measures such as alarming and stopping and the like so as to realize the protection of the diesel engine. The rail pressure refers to the pressure on a common oil supply pipe in a high-pressure common rail system, the high-pressure common rail refers to the pressure on the common oil supply pipe, the high-pressure common rail refers to the high-pressure oil pump for conveying diesel oil to the common oil supply pipe, and each cylinder oil sprayer is connected with the common oil supply pipe; the generation of 'injection pressure' and 'injection action' of each cylinder are realized by controlling the oil pressure in the common oil pipe and the on-off of the injector of each cylinder, and a diesel oil supply mode which is completely separated from each other is realized.
In the embodiment of the application, the problem that the protection of the injector clamping stagnation based on hardware in the prior art can only realize the protection of the diesel engine when the injector clamping stagnation is at the 'open' position, and cannot realize the protection when the injector clamping stagnation is at the 'close' position is solved; secondly, if the structure is cut off because the oil injection quantity is large, the structure cannot reset by itself and needs to carry out pressure relief on the oil supply end of the oil injector to reset, and under transient working conditions such as sudden loading of a diesel engine, the pressure of an accumulation cavity can be quickly changed due to rapid change of the oil injection quantity, so that a ball is abnormally seated, the injection is abnormally closed, at the moment, the diesel engine cannot detect faults, and cannot reset by itself and self-heals, so that the trouble is caused to a user, the method for diagnosing the faults of the oil injector based on rail pressure is provided, and the execution flow of the method is as shown in figure 2, and comprises the following steps:
s101, collecting real-time rail pressure data and oil injection quantity of each oil injector of a current diesel engine in a working cycle;
in the embodiment of the application, the current diesel engine comprises a fixed number of cylinders, wherein each cylinder corresponds to an oil injector, one working cycle is completed by four processes of air intake, compression, combustion expansion and exhaust, the real-time rail pressure data can be acquired based on a pressure sensor, the oil injection quantity can be acquired based on a flow sensor, and in the embodiment of the application, the rail pressure data and the oil injection quantity acquisition mode are not limited.
S102, acquiring the cylinder number of the current diesel engine, and calculating a rail pressure change coefficient of the current fuel injector aiming at the current fuel injector based on the cylinder number, the real-time rail pressure data and the fuel injection quantity;
in the embodiment of the application, the cylinder number of the diesel engine is a fixed value and can be acquired at a designated position, and the embodiment of the application is not limited to a specific acquisition mode.
Firstly, calculating a rail pressure reduction coefficient based on the cylinder number, the fuel injection quantity and the real-time rail pressure data, wherein the specific calculation process is as follows:
obtaining target rail pressure data and target oil injection quantity of the current rail pressure device, wherein the target rail pressure data comprises: the first common rail pressure at the current fuel injector opening time, the second common rail pressure at the current fuel injector closing time and the third common rail pressure of the current fuel injector after closing delay, wherein the closing delay of the fuel injector refers to the time from closing of a fuel injector driving signal (power-on time) to termination of fuel injection by seating of a fuel injector needle valve; because of the physical actuation delay and the drive signal, the injectors have a closing delay time, which is typically a fixed value only in relation to the injector hardware, wherein the target rail pressure number is based on the real-time rail pressure data acquisition, and the target injection quantity is known.
In the embodiment of the application, a certain relation exists between the real-time rail pressure actual measurement value and the power-on signal of the oil sprayer, the rail (common rail pipe) is integral, and the oil sprayers of all cylinders are arranged on the rail (common rail pipe); the ECU is used for powering up the fuel injector to drive the fuel injector to be opened and closed, and rail pressure is continuously reduced when the fuel injector is opened; when the injector is closed, rail pressure continuously rises: after the "injector off time + injector off delay time", the rail pressure reaches a higher level. The real-time rail pressure actual measurement and the injector power-on signal are shown in fig. 3.
In the embodiment of the present application, if the current injector is the a-th cylinder injector, the real-time rail pressure actual measurement value, the injector closing delay, the injector power-up signal, the first common rail pressure pa1, the second common rail pressure pa2 and the third common rail pressure pa3 under the single cylinder injection action are taken, and details are shown in fig. 4.
Wherein:
pa1: a first common rail pressure at a start time of the first cylinder injector;
pa2: second common rail pressure at a closing time of the a-th cylinder injector;
pa3: a third common rail pressure delayed by closing after closing the first cylinder injector;
in the embodiment of the application, because the rail pressure drop before injection after injection is influenced by single injection quantity, the single-cylinder circulating oil quantity is considered when the rail pressure drop coefficient of single injection is calculated; in the transient process, the influence of different oil injection amounts of each cylinder on the calculation of the rail pressure deviation coefficient is avoided.
Firstly, calculating a pressure difference value between the first common rail pressure pa1 and the second common rail pressure pa2, and taking a ratio of the pressure difference value to the target fuel injection quantity as a first parameter; for each fuel injector, calculating the ratio of the difference value between the common rail pressure at the moment of opening the fuel injector and the common rail pressure at the moment of closing the fuel injector to the corresponding fuel injection quantity based on the real-time rail pressure data and the fuel injection quantity respectively to obtain each second parameter, taking the ratio of the sum of each second parameter to the number of cylinders as a third parameter, and taking the ratio of the first parameter to the third parameter as a rail pressure reduction coefficient, as shown in a formula (1);
wherein:
m is the number of cylinders of the diesel engine;
q a setting an oil injection quantity for the a cylinder;
δ a drop The rail pressure drop coefficient after the injection of the rail pressure cylinder a is set.
Then, the specific processing procedure for calculating the rail pressure elevation coefficient based on the cylinder number and the real-time rail pressure data is as follows:
the rail pressure rise is not influenced by the single-cylinder oil quantity and is only influenced by the closing delay of the oil injector, so that first pressure difference values of the third common rail pressure and the second common rail pressure are calculated firstly, for each oil injector, second pressure difference values of the common rail pressure of the oil injector after the closing delay and the common rail pressure of the oil injector at the closing moment are calculated respectively based on the real-time rail pressure data, the ratio of the second pressure difference values to the cylinder number is used as a third pressure difference value, and the ratio of the first pressure difference value to the third pressure difference value is used as a rail pressure drop rise coefficient. As shown in the formula (2),
and respectively calculating absolute values of the rail pressure reduction coefficient and the difference value between the rail pressure increase coefficient and 1 to obtain a first coefficient and a second coefficient, and selecting the maximum value of the first coefficient and the second coefficient as a rail pressure change coefficient.
As shown in the formula (3),
wherein:
δ a : rail pressure change coefficient of the a-th cylinder;
q a : setting oil injection quantity of a first cylinder;
m: the number of cylinders of the current engine;
in the embodiment of the application, aiming at the rail pressure rising coefficient and the rail pressure reducing coefficient, when the oil injector is stuck at the normally open position, the rail pressure rising coefficient is more sensitive, and when the oil injector is stuck at the normally closed position, the rail pressure reducing coefficient is more sensitive. Under normal conditions, the rail pressure decrease coefficient/rail pressure increase coefficient should=1, and when an abnormality occurs, the rail pressure decrease coefficient/rail pressure increase coefficient should be much greater than 1 or much less than 1, where 1 is subtracted and the absolute value is taken and finally taken to be greater, in order to find out what is the maximum difference between the rail pressure coefficient and 1. The closer to 1, the more normal the system operation is represented.
S103, comparing the rail pressure change coefficient with a preset rail pressure change threshold value;
in the embodiment of the present application, the rail pressure change coefficient is compared with the preset rail pressure change threshold, where the preset rail pressure change threshold may be set based on experience or specific situations, and in the embodiment of the present application, the specific value of the preset rail pressure change threshold is not limited, and preferably, the preset rail pressure change threshold in the embodiment of the present application is 0.25. I.e. a rail pressure change factor exceeding 0.25 represents an abnormality.
And S104, judging that the current fuel injector has faults under the condition that the rail pressure change coefficient is larger than the preset rail pressure change threshold value.
In the embodiment of the application, under the condition that the rail pressure change coefficient is larger than the preset rail pressure change threshold value, the current fuel injector is judged to have faults, otherwise, the current fuel injector is judged to operate normally.
Further, on the premise that the current oil sprayer has a fault, acquiring the rail pressure change coefficient, and if the first coefficient is the rail pressure change coefficient, judging that the current oil sprayer has a normally open fault; and if the second coefficient is the rail pressure change coefficient, judging that the normally closed fault exists in the current fuel injector.
Further, under the premise that the current fuel injector has a fault, counting the occurrence times of the condition that the rail pressure change coefficient is larger than the preset rail pressure change threshold value continuously, and under the condition that the occurrence times are larger than the preset occurrence times threshold value, performing active fuel control operation, wherein the active fuel control operation comprises: the preset occurrence frequency threshold can be set based on experience or specific conditions, the embodiment of the application is not particularly limited, and preferably, in the embodiment of the application, the actions such as active oil limiting and oil stopping can be performed by continuously judging (4-8) abnormal working cycles when judging the rail pressure change coefficient.
The application discloses a rail pressure-based fault diagnosis method for an oil sprayer, which comprises the following steps: collecting real-time rail pressure data and oil injection quantity of each oil injector of a current diesel engine in a working cycle; acquiring the cylinder number of a current diesel engine, and calculating a rail pressure change coefficient of the current fuel injector aiming at the current fuel injector based on the cylinder number, real-time rail pressure data and fuel injection quantity; and comparing the rail pressure change coefficient with a preset rail pressure change threshold value, and judging that the current fuel injector has faults under the condition that the rail pressure change coefficient is larger than the preset rail pressure change threshold value. According to the process, whether the oil sprayer has faults or not is determined based on the rail pressure change coefficient, and the problems that when the oil sprayer is blocked at the closed position due to the blocking protection of the oil sprayer by adopting hardware, the protection cannot be realized, the oil sprayer is cut off due to large oil injection quantity, self-reset cannot be realized, the oil injection quantity is changed quickly, the pressure of an accumulation cavity is changed quickly, abnormal seating of pellets is caused, and abnormal closing of injection is caused are avoided.
Based on the above-mentioned method for diagnosing faults of an injector based on rail pressure, in an embodiment of the present application, a fault diagnosing device for an injector based on rail pressure is provided, and a structural block diagram of the device is shown in fig. 5, including:
an acquisition module 201, an acquisition and calculation module 202, a comparison module 203 and a decision module 204.
Wherein,
the acquisition module 201 is used for acquiring real-time rail pressure data and oil injection quantity of each oil injector of the current diesel engine in one working cycle;
the acquiring and calculating module 202 is configured to acquire a cylinder number of the current diesel engine, and calculate, for a current fuel injector, a rail pressure change coefficient of the current fuel injector based on the cylinder number, the real-time rail pressure data, and the fuel injection amount;
the comparison module 203 is configured to compare the rail pressure change coefficient with a preset rail pressure change threshold;
the determining module 204 is configured to determine that the current injector has a fault if the rail pressure change coefficient is greater than the preset rail pressure change threshold.
The application discloses a fault diagnosis device of an oil sprayer based on rail pressure, which comprises the following components: collecting real-time rail pressure data and oil injection quantity of each oil injector of a current diesel engine in a working cycle; acquiring the cylinder number of a current diesel engine, and calculating a rail pressure change coefficient of the current fuel injector aiming at the current fuel injector based on the cylinder number, real-time rail pressure data and fuel injection quantity; and comparing the rail pressure change coefficient with a preset rail pressure change threshold value, and judging that the current fuel injector has faults under the condition that the rail pressure change coefficient is larger than the preset rail pressure change threshold value. According to the process, whether the oil sprayer has faults or not is determined based on the rail pressure change coefficient, and the problems that when the oil sprayer is blocked at the closed position due to the blocking protection of the oil sprayer by adopting hardware, the protection cannot be realized, the oil sprayer is cut off due to large oil injection quantity, self-reset cannot be realized, the oil injection quantity is changed quickly, the pressure of an accumulation cavity is changed quickly, abnormal seating of pellets is caused, and abnormal closing of injection is caused are avoided.
In an embodiment of the present application, the obtaining and calculating module 204 includes:
the device comprises a first computing unit, a second computing unit and a computing and selecting unit.
Wherein,
the first calculation unit is used for calculating a rail pressure reduction coefficient based on the cylinder number, the fuel injection quantity and the real-time rail pressure data;
the second calculation unit is used for calculating a rail pressure rising coefficient based on the cylinder number and the real-time rail pressure data;
the calculating and selecting unit is used for respectively calculating absolute values of the rail pressure reducing coefficient and the difference value between the rail pressure increasing coefficient and 1 to obtain a first coefficient and a second coefficient, and selecting the maximum value of the first coefficient and the second coefficient as a rail pressure change coefficient.
In an embodiment of the present application, the first computing unit includes:
the system comprises an acquisition subunit, a first calculation subunit, a second calculation subunit and a first determination subunit.
Wherein,
the acquisition subunit is configured to acquire target rail pressure data and a target fuel injection amount of the current rail pressure device, where the target rail pressure data includes: the method comprises the steps of enabling a first common rail pressure at the opening moment of a current oil injector, a second common rail pressure at the closing moment of the current oil injector and a third common rail pressure of the current oil injector after closing delay;
the first calculating subunit is used for calculating a pressure difference value between the first common rail pressure and the second common rail pressure, and taking a ratio of the pressure difference value to the target fuel injection quantity as a first parameter;
the second calculating subunit is configured to calculate, for each fuel injector, a ratio of a difference value between a common rail pressure at an injector opening time and a common rail pressure at an injector closing time to a corresponding fuel injection amount based on the real-time rail pressure data and the fuel injection amount, to obtain each second parameter, and take a ratio of a sum of each second parameter to the cylinder number as a third parameter;
the first determination subunit is configured to take a ratio of the first parameter to the third parameter as a rail pressure reduction coefficient.
In an embodiment of the present application, the second calculating unit includes:
the third computing subunit, the fourth computing subunit and the second determining subunit.
Wherein,
the third calculation subunit is used for calculating a first pressure difference value between the third common rail pressure and the second common rail pressure;
the fourth calculating subunit is configured to calculate, for each fuel injector, each second pressure difference value of the rail pressure of the fuel injector after the fuel injector is turned off and the rail pressure of the fuel injector at the time of turning off based on the real-time rail pressure data, and take a ratio of each second pressure difference value to the cylinder number as a third pressure difference value;
the second determination subunit is configured to take a ratio of the first pressure difference value to the third pressure difference value as a rail pressure drop increase coefficient.
The distribution device comprises a processor and a memory, wherein the acquisition module, the acquisition and calculation module, the comparison module, the judgment module and the like are all stored in the memory as program units, and the processor executes the program units stored in the memory to realize corresponding functions.
The processor includes a kernel, and the kernel fetches the corresponding program unit from the memory. The inner core can be provided with one or more than one, and the problems that protection cannot be realized, the oil sprayer is cut off because the oil spraying quantity is large, self-reset cannot be realized, the oil spraying quantity is changed quickly, the pressure of an accumulation cavity is changed quickly, abnormal seating of pellets is caused, and abnormal closing of injection is caused by the fact that the clamping protection of the oil sprayer adopting hardware is avoided by adjusting the inner core parameters.
The memory may include volatile memory, random Access Memory (RAM), and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM), among other forms in computer readable media, the memory including at least one memory chip.
The embodiment of the application provides a computer storage medium, and a program is stored on the computer storage medium, and the program is executed by a processor to realize the fault diagnosis method of the fuel injector based on rail pressure.
The embodiment of the application provides a processor which is used for running a program, wherein the fault diagnosis method of the fuel injector based on rail pressure is executed when the program runs.
An embodiment of the present application provides an apparatus, where a structural block diagram of the apparatus is shown in fig. 6, and the apparatus includes: a processor 301, a storage medium 302, and a program stored on the storage medium 302 and executable on the processor 302, the processor 301 implementing the following steps when executing the program:
collecting real-time rail pressure data and oil injection quantity of each oil injector of a current diesel engine in a working cycle;
acquiring the cylinder number of the current diesel engine, and calculating a rail pressure change coefficient of the current fuel injector aiming at the current fuel injector based on the cylinder number, the real-time rail pressure data and the fuel injection quantity;
comparing the rail pressure change coefficient with a preset rail pressure change threshold value;
and under the condition that the rail pressure change coefficient is larger than the preset rail pressure change threshold value, judging that the current fuel injector has faults.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, etc., such as Read Only Memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.
Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises an element.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and variations of the present application will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the application are to be included in the scope of the claims of the present application.
Claims (12)
1. A fault diagnosis method of an oil injector based on rail pressure is characterized by comprising the following steps:
collecting real-time rail pressure data and oil injection quantity of each oil injector of a current diesel engine in a working cycle;
acquiring the cylinder number of the current diesel engine, and calculating a rail pressure change coefficient of the current fuel injector aiming at the current fuel injector based on the cylinder number, the real-time rail pressure data and the fuel injection quantity;
comparing the rail pressure change coefficient with a preset rail pressure change threshold value;
and under the condition that the rail pressure change coefficient is larger than the preset rail pressure change threshold value, judging that the current fuel injector has faults.
2. The rail pressure-based fuel injector failure diagnosis method according to claim 1, wherein calculating, for a current fuel injector, a rail pressure variation coefficient of the current fuel injector based on the number of cylinders, the real-time rail pressure data, and the fuel injection amount, includes:
calculating a rail pressure reduction coefficient based on the cylinder number, the fuel injection amount, and the real-time rail pressure data;
calculating a rail pressure elevation coefficient based on the cylinder number and the real-time rail pressure data;
and respectively calculating absolute values of the rail pressure reduction coefficient and the difference value between the rail pressure increase coefficient and 1 to obtain a first coefficient and a second coefficient, and selecting the maximum value of the first coefficient and the second coefficient as a rail pressure change coefficient.
3. The rail pressure-based fuel injector failure diagnosis method according to claim 2, wherein calculating a rail pressure reduction coefficient based on the cylinder number, the fuel injection amount, and the real-time rail pressure data, comprises:
obtaining target rail pressure data and target oil injection quantity of the current rail pressure device, wherein the target rail pressure data comprises: the method comprises the steps of enabling a first common rail pressure at the opening moment of a current oil injector, a second common rail pressure at the closing moment of the current oil injector and a third common rail pressure of the current oil injector after closing delay;
calculating a pressure difference value between the first common rail pressure and the second common rail pressure, and taking a ratio of the pressure difference value to the target fuel injection quantity as a first parameter;
for each fuel injector, calculating the ratio of the difference value of the common rail pressure at the opening time of the fuel injector and the common rail pressure at the closing time of the fuel injector to the corresponding fuel injection quantity based on the real-time rail pressure data and the fuel injection quantity respectively to obtain each second parameter, and taking the ratio of the sum of each second parameter to the cylinder number as a third parameter;
and taking the ratio of the first parameter to the third parameter as a rail pressure reduction coefficient.
4. The rail pressure-based fuel injector fault diagnosis method according to claim 3, characterized in that calculating a rail pressure increase coefficient based on the cylinder number and the real-time rail pressure data includes:
calculating a first pressure difference between the third rail pressure and the second rail pressure;
for each fuel injector, respectively calculating each second pressure difference value of the common rail pressure of the fuel injector after closing delay and the common rail pressure of the fuel injector at the closing moment based on the real-time rail pressure data, and taking the ratio of each second pressure difference value to the cylinder number as a third pressure difference value;
and taking the ratio of the first pressure difference value to the third pressure difference value as a rail pressure drop rising coefficient.
5. The rail pressure based fuel injector fault diagnosis method according to claim 1, further comprising:
counting the occurrence times of the condition that the rail pressure change coefficient is larger than the preset rail pressure change threshold value continuously;
and under the condition that the occurrence frequency is larger than a preset occurrence frequency threshold value, performing active oil control operation.
6. The rail pressure based fuel injector fault diagnosis method according to claim 2, further comprising: and under the condition that the rail pressure change coefficient is larger than the preset rail pressure change threshold value, judging that the current fuel injector has faults, wherein the method comprises the following steps:
if the first coefficient is the rail pressure change coefficient, judging that the current fuel injector has a normally open fault;
and if the second coefficient is the rail pressure change coefficient, judging that the normally closed fault exists in the current fuel injector.
7. A rail pressure-based fuel injector fault diagnostic apparatus, comprising:
the acquisition module is used for acquiring real-time rail pressure data and oil injection quantity of each oil injector of the current diesel engine in one working cycle;
the acquisition and calculation module is used for acquiring the cylinder number of the current diesel engine, and calculating a rail pressure change coefficient of the current fuel injector aiming at the current fuel injector based on the cylinder number, the real-time rail pressure data and the fuel injection quantity;
the comparison module is used for comparing the rail pressure change coefficient with a preset rail pressure change threshold value;
and the judging module is used for judging that the current fuel injector has faults under the condition that the rail pressure change coefficient is larger than the preset rail pressure change threshold value.
8. The rail pressure based fuel injector fault diagnostic apparatus of claim 7, wherein the acquisition and calculation module comprises:
a first calculation unit configured to calculate a rail pressure reduction coefficient based on the cylinder number, the injection amount, and the real-time rail pressure data;
a second calculation unit configured to calculate a rail pressure increase coefficient based on the cylinder number and the real-time rail pressure data;
and the calculating and selecting unit is used for respectively calculating absolute values of the rail pressure reduction coefficient and the difference value between the rail pressure increase coefficient and 1 to obtain a first coefficient and a second coefficient, and selecting the maximum value of the first coefficient and the second coefficient as a rail pressure change coefficient.
9. The rail pressure based fuel injector fault diagnosis device according to claim 8, wherein said first calculation unit includes:
the acquisition subunit is used for acquiring target rail pressure data and target oil injection quantity of the current rail pressure device, wherein the target rail pressure data comprises: the method comprises the steps of enabling a first common rail pressure at the opening moment of a current oil injector, a second common rail pressure at the closing moment of the current oil injector and a third common rail pressure of the current oil injector after closing delay;
a first calculation subunit, configured to calculate a pressure difference between the first common rail pressure and the second common rail pressure, and take a ratio of the pressure difference to the target fuel injection amount as a first parameter;
the second calculating subunit is used for respectively calculating the ratio of the difference value of the common rail pressure at the opening time of the oil injector and the common rail pressure at the closing time of the oil injector to the corresponding oil injection quantity based on the real-time rail pressure data and the oil injection quantity for each oil injector to obtain each second parameter, and taking the ratio of the sum of each second parameter to the cylinder number as a third parameter;
and the first determination subunit is used for taking the ratio of the first parameter to the third parameter as a rail pressure reduction coefficient.
10. The rail pressure-based fuel injector failure diagnosis apparatus according to claim 9, wherein said second calculation unit includes:
a third calculation subunit, configured to calculate a first pressure difference value between the third common rail pressure and the second common rail pressure;
a fourth calculation subunit, configured to calculate, for each fuel injector, respective second pressure differences of the fuel injector with respect to the rail pressure of the fuel injector delayed by closing and the rail pressure of the fuel injector at the closing time based on the real-time rail pressure data, and take a ratio of the respective second differences to the cylinder number as a third pressure difference;
a second determination subunit, configured to take a ratio of the first pressure difference value and the third pressure difference value as a rail pressure drop rising coefficient.
11. A storage medium comprising a stored program, wherein the program performs the rail pressure-based fuel injector fault diagnosis method of claims 1-5.
12. A processor for running a program, wherein the program is operative to perform the rail pressure-based fuel injector fault diagnosis method of claims 1-5.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311290304.1A CN117189399A (en) | 2023-10-07 | 2023-10-07 | Rail pressure-based oil sprayer fault diagnosis method and device, storage medium and processor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311290304.1A CN117189399A (en) | 2023-10-07 | 2023-10-07 | Rail pressure-based oil sprayer fault diagnosis method and device, storage medium and processor |
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| CN117189399A true CN117189399A (en) | 2023-12-08 |
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| CN202311290304.1A Pending CN117189399A (en) | 2023-10-07 | 2023-10-07 | Rail pressure-based oil sprayer fault diagnosis method and device, storage medium and processor |
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