CN113482824B - Detection method and device for oil sprayer - Google Patents
Detection method and device for oil sprayer Download PDFInfo
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- CN113482824B CN113482824B CN202110857280.8A CN202110857280A CN113482824B CN 113482824 B CN113482824 B CN 113482824B CN 202110857280 A CN202110857280 A CN 202110857280A CN 113482824 B CN113482824 B CN 113482824B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
- F02M65/001—Measuring fuel delivery of a fuel injector
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Abstract
The invention provides a method and a device for detecting a fuel injector, wherein the method comprises the following steps: under the condition that an engine electronic control unit sends a driving instruction to an oil sprayer to instruct the oil sprayer to spray fuel oil, determining the spraying time when the oil sprayer receives the driving instruction; acquiring a first voltage value of an engine electronic control unit in a first time period before the injection time and a second voltage value of the engine electronic control unit in a second time period after the injection time; comparing the voltage difference value between the first voltage value and the second voltage value with a differential pressure threshold value, and judging whether the voltage difference value is greater than the differential pressure threshold value; if the fuel quantity is larger than the preset value, determining that the fuel oil is normally sprayed by the fuel injector; and if not, determining that the fuel is abnormally injected by the fuel injector. Determining whether fuel oil sprayed by the oil sprayer is normal or not based on a voltage difference value of a first voltage value of an engine electronic control unit before the spraying time and a second voltage value after the spraying time; and when the oil injector has no electrical fault, determining whether the oil injector has the fault or not through the voltage change of the engine electronic control unit.
Description
Technical Field
The invention relates to the technical field of diesel engines, in particular to a method and a device for detecting an oil sprayer.
Background
The fuel injector is one of important core parts of the diesel engine, and the fuel injector accurately controls the fuel injection quantity by receiving a fuel injection pulse command sent by an electronic control unit of the engine. When the fuel injector injects fuel normally, the diesel engine can be ensured to work normally, and when the fuel injector injects fuel abnormally, the diesel engine can be caused to generate faults.
At present, whether the fuel injector has a fault is usually detected by diagnosing whether the fuel injector has an electrical fault, that is, whether the fuel injector has a fault is judged according to whether the drive chip and the fuel injector have electrical faults such as short circuit, open circuit and the like. However, in the current detection mode, whether the fuel injector releases fuel normally or not cannot be known under the condition that hardware devices such as the fuel injector and the driving chip are good, and whether the fuel injector breaks down or not cannot be accurately determined.
Disclosure of Invention
In view of this, the invention provides a method and a device for detecting an injector, and by applying the method and the device, whether the fuel injected by the injector is normal or not can be determined under the condition that hardware equipment such as the injector and a driving chip and the like have no electrical fault.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
a method of testing a fuel injector comprising:
under the condition that an engine electronic control unit sends a driving instruction to an oil sprayer to instruct the oil sprayer to spray fuel oil, determining the spraying time when the oil sprayer receives the driving instruction;
determining a first time period before the injection time and determining a second time period after the injection time, wherein the end time of the first time period is the injection time, and the start time of the second time period is the injection time;
acquiring a first voltage value of the engine electronic control unit in the first time period and a second voltage value of the engine electronic control unit in the second time period;
acquiring a voltage difference value between the first voltage value and the second voltage value, comparing the voltage difference value with a preset differential pressure threshold value, and judging whether the voltage difference value is greater than the differential pressure threshold value;
if the voltage difference value is larger than the pressure difference threshold value, determining that the fuel oil is normally injected by the fuel injector;
and if the voltage difference value is not larger than the pressure difference threshold value, determining that the fuel oil is abnormally injected by the fuel injector.
The above method, optionally, the acquiring a first voltage value of the engine electronic control unit in the first time period and a second voltage value of the engine electronic control unit in the second time period includes:
acquiring each first acquisition voltage value of the engine electronic control unit in the first time period and each second acquisition voltage value of the engine electronic control unit in the second time period based on a preset sampling frequency;
and performing median average filtering processing on each first collected voltage value and each second collected voltage value to obtain the first voltage value and the second voltage value.
Optionally, the above method, performing median average filtering on each of the first collected voltage values and each of the second collected voltage values to obtain the first voltage value and the second voltage value, includes:
for each first acquisition voltage value, after the first acquisition voltage value with the largest numerical value and the first acquisition voltage value with the smallest numerical value are screened out, performing arithmetic mean operation on each remaining first acquisition voltage value, and taking the numerical value obtained through the arithmetic mean operation as the first voltage value;
and for each second acquisition voltage value, after the second acquisition voltage value with the largest numerical value and the second acquisition voltage value with the smallest numerical value are screened out, performing arithmetic mean operation on the remaining second acquisition voltage values, and taking the numerical value obtained through the arithmetic mean operation as the second voltage value.
The method described above, optionally, further includes:
when the fuel oil sprayed by the fuel oil sprayer is determined to be abnormal, an alarm instruction is generated and sent to a preset alarm module so as to trigger the alarm module to alarm for abnormity.
The above method, optionally, wherein the determining a first time period before the injection time and determining a second time period after the injection time includes:
determining a first acquisition time before the injection time and determining a second acquisition time after the injection time, wherein the first acquisition time is separated from the injection time by a preset time step, and the second acquisition time is separated from the injection time by the time step;
determining a length of time from the first acquisition time to the injection time as the first period of time and determining a length of time from the injection time to the second acquisition time as the second period of time.
A fuel injector testing apparatus comprising:
the first determining unit is used for determining the injection time when the oil injector receives a driving instruction under the condition that the engine electronic control unit sends the driving instruction to the oil injector to indicate the oil injector to inject the fuel oil;
A second determining unit, configured to determine a first time period before the injection time and a second time period after the injection time, where an end time of the first time period is the injection time, and a start time of the second time period is the injection time;
the acquisition unit is used for acquiring a first voltage value of the engine electronic control unit in the first time period and a second voltage value of the engine electronic control unit in the second time period;
the acquisition unit is used for acquiring a voltage difference value between the first voltage value and the second voltage value, comparing the voltage difference value with a preset differential pressure threshold value and judging whether the voltage difference value is larger than the differential pressure threshold value or not;
the third determining unit is used for determining that the fuel oil sprayed by the fuel oil sprayer is normal if the voltage difference value is larger than the pressure difference threshold value;
and the fourth determining unit is used for determining that the fuel oil is abnormally injected by the fuel injector if the voltage difference value is not larger than the pressure difference threshold value.
The above apparatus, optionally, the collecting unit includes:
the acquisition subunit is used for acquiring each first acquisition voltage value of the engine electric control unit in the first time period and each second acquisition voltage value of the engine electric control unit in the second time period based on a preset sampling frequency;
And the processing subunit is used for performing median average filtering processing on each first collected voltage value and each second collected voltage value to obtain the first voltage value and the second voltage value.
The above apparatus, optionally, the processing subunit includes:
the first operation module is used for screening out the first acquisition voltage value with the largest numerical value and the first acquisition voltage value with the smallest numerical value for each first acquisition voltage value, then carrying out arithmetic mean operation on the rest first acquisition voltage values, and taking the numerical value obtained by the operation as the first voltage value;
and the second operation module is used for screening out the second acquisition voltage value with the largest numerical value and the second acquisition voltage value with the smallest numerical value for each second acquisition voltage value, then performing arithmetic mean operation on the rest second acquisition voltage values, and taking the numerical value obtained through the arithmetic mean operation as the second voltage value.
The above apparatus, optionally, further comprises:
and the generating unit is used for generating an alarm instruction when the fuel oil sprayed by the fuel oil sprayer is abnormal, and sending the alarm instruction to a preset alarm module so as to trigger the alarm module to alarm for abnormity.
The above apparatus, optionally, the second determining unit includes:
the first determining submodule is used for determining a first acquisition time before the injection time and determining a second acquisition time after the injection time, wherein the first acquisition time is separated from the injection time by a preset time step, and the second acquisition time is separated from the injection time by the time step;
a second determination submodule configured to determine a time length from the first collection time to the injection time as the first period and determine a time length from the injection time to the second collection time as the second period.
Compared with the prior art, the invention has the following advantages:
the invention provides a method and a device for detecting a fuel injector, wherein the method comprises the following steps: under the condition that an engine electronic control unit sends a driving instruction to an oil sprayer to instruct the oil sprayer to spray fuel oil, determining the spraying time when the oil sprayer receives the driving instruction; determining a first time period before the injection time and determining a second time period after the injection time, wherein the ending time of the first time period is the injection time, and the starting time of the second time period is the injection time; acquiring a first voltage value of the engine electronic control unit in the first time period and a second voltage value of the engine electronic control unit in the second time period; acquiring a voltage difference value between the first voltage value and the second voltage value, comparing the voltage difference value with a preset differential pressure threshold value, and judging whether the voltage difference value is greater than the differential pressure threshold value or not; if the voltage difference value is larger than the pressure difference threshold value, determining that the fuel oil is normally injected by the fuel oil injector; and if the voltage difference value is not larger than the pressure difference threshold value, determining that the fuel oil is abnormally injected by the fuel injector. According to the invention, the first voltage value of the engine electronic control unit before the injection time of the oil injector and the second voltage value after the injection time of the oil injector are obtained, and whether the oil fuel injected by the oil injector is normal or not is determined based on the voltage difference value between the first voltage value and the second voltage value, so that whether the oil fuel injected by the oil injector is normal or not can be determined under the condition that the oil injector has no electrical fault, and whether the oil injector has the fault or not can be determined.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flow chart of a method for testing a fuel injector according to an embodiment of the present disclosure;
FIG. 2 is another method flow diagram of a method for testing a fuel injector provided in accordance with an embodiment of the present invention;
FIG. 3 is a flow chart of yet another method of a method for testing a fuel injector provided in accordance with an embodiment of the present invention;
FIG. 4 is a flow chart of another method of a fuel injector testing method according to an embodiment of the present disclosure;
FIG. 5 is a schematic structural diagram of a fuel injector detection device according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In this application, 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 an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
The invention is applied to an automobile engine control system, wherein an execution subject of the invention can be a controller in the automobile engine control system, and the method and the flow chart of the detection method of the fuel injector provided by the embodiment of the invention are shown in fig. 1, and the method and the flow chart are specifically described as follows:
s101, determining the injection time of the fuel injector when the fuel injector receives a driving instruction under the condition that the engine electric control unit sends the driving instruction to the fuel injector to instruct the fuel injector to inject fuel.
The engine electric control unit is a comprehensive control device of the engine, and has the functions of calculating, processing, judging and outputting instructions according to programs stored by the engine electric control unit, and controlling the action of relevant actuators to achieve the aim of quickly, accurately and automatically controlling the work of the engine.
In the method provided by the embodiment of the invention, under the condition that the engine electronic control unit sends a driving instruction to the oil injector and the oil injector is instructed to inject the fuel through the driving instruction, the execution main body determines the injection time when the oil injector receives the driving instruction, wherein the injection time is the theoretical time for injecting the fuel after the oil injector receives the driving instruction, the time is specifically a time point, and the time unit can be specifically accurate to seconds or milliseconds.
In the method provided by the embodiment of the invention, the driving instruction sent by the engine electronic control unit can be specifically an oil injection pulse signal, and the oil injector controls the opening and closing of the electromagnetic valve according to the driving instruction after receiving the driving instruction so as to realize the injection of the fuel oil.
S102, determining a first time period before the injection time, and determining a second time period after the injection time, wherein the ending time of the first time period is the injection time, and the starting time of the second time period is the injection time.
After the injection time is determined, a first time period before the injection time and a second time period after the injection time need to be determined, and a specific determination process is shown in fig. 2 and specifically described as follows:
S201, determining a first acquisition time before the injection time and determining a second acquisition time after the injection time, wherein the first acquisition time is separated from the injection time by a preset time step, and the second acquisition time is separated from the injection time by the time step.
The first acquisition time and the second acquisition time are both specific time points; the time step is a time length which can be set according to actual requirements, and specifically, if the time step is set to be 5 minutes, the first acquisition time is a time point 5 minutes before the injection time, and the second acquisition time is a time point 5 minutes after the injection time.
S202, determining the time length from the first collection time to the injection time as the first time period, and determining the time length from the injection time to the second collection time as the second time period.
In the invention, the starting time of the first time period is first acquisition time, and the ending time is injection time; the start time of the second period is the injection time and the end time is the second acquisition time. Preferably, the second period of time and the first period of time are the same in duration.
The invention determines a first time period before the injection time and a second time period after the injection time based on the injection time after determining the injection time so as to obtain the voltage data of the engine electronic control unit in the first time period and the voltage data in the second time period. According to the invention, the first time period and the second time period which are equal in time length can be accurately obtained by determining the first acquisition time and the second acquisition time and then determining the first time period and the second time period, so that the progress of subsequent voltage data acquisition is improved.
S103, collecting a first voltage value of the engine electronic control unit in the first time period and a second voltage value of the engine electronic control unit in the second time period.
Referring to fig. 3, a specific process for acquiring a first voltage value of an engine electronic control unit in a first time period and a second voltage value of the engine electronic control unit in a second time period provided in the embodiment of the present invention is specifically described as follows:
s301, collecting each first collected voltage value of the engine electronic control unit in the first time period and each second collected voltage value of the engine electronic control unit in the second time period based on a preset sampling frequency.
The specific value of the sampling frequency in the present invention can be set according to actual requirements, specifically, the sampling frequency can be set to 10 times/minute. And acquiring the voltage of the engine electronic control unit in the first time period and the voltage of the engine electronic control unit in the second time period according to the sampling frequency, so as to obtain each first acquired voltage value of the engine electronic control unit in the first time period and each second acquired voltage value of the engine electronic control unit in the second time period.
S302, median average filtering processing is carried out on each first collected voltage value and each second collected voltage value, and the first voltage value and the second voltage value are obtained.
In the present invention, a specific process of obtaining the first voltage value and the second voltage value is shown in fig. 4, and the specific description is as follows:
s401, for each first collection voltage value, after the first collection voltage value with the largest numerical value and the first collection voltage value with the smallest numerical value are screened out, arithmetic mean operation is carried out on the rest first collection voltage values, and the numerical value obtained through operation is used as the first voltage value.
S402, for each second acquisition voltage value, after the second acquisition voltage value with the largest numerical value and the second acquisition voltage value with the smallest numerical value are screened out, arithmetic mean operation is carried out on the rest second acquisition voltage values, and the numerical value obtained through operation is used as the second voltage value.
In the method provided by the embodiment of the present invention, the execution sequence of S401 and S402 may be replaced, and further, S401 and S402 may be executed in parallel, so that the first voltage value and the second voltage value may be obtained at the same time.
According to the invention, through carrying out median average filtering processing on each first acquisition voltage value and each second acquisition voltage value, the interference of accidental pulses can be effectively filtered out, and the deviation value of sampling data is reduced, so that the first voltage value and the second voltage value with high accuracy and high reliability can be obtained.
S104, obtaining a voltage difference value between the first voltage value and the second voltage value, comparing the voltage difference value with a preset differential pressure threshold value, and judging whether the voltage difference value is larger than the differential pressure threshold value or not; if the voltage difference value is larger than the voltage difference threshold value, executing S105; if the voltage difference is not greater than the voltage difference threshold, S106 is executed.
The differential pressure threshold value can be the average value of the difference value when the fuel injector is normally driven for multiple times to inject fuel; and comparing the voltage difference value with a preset pressure measurement threshold value, and further indirectly judging whether the fuel oil sprayed by the fuel injector is normal or not.
In the method provided by the embodiment of the invention, when the voltage difference value is greater than the pressure measurement threshold value, the voltage of the engine electronic control unit is shown to fluctuate, so that the operation that the fuel injector is opened and closed by driving the electromagnetic valve can be indirectly known, the fuel is injected, and the condition that the fuel injector injects the fuel is normal can be determined; when the voltage difference is not larger than the pressure measurement threshold, the voltage of the engine electronic control unit is not fluctuated, so that the condition that the fuel injector does not drive the electromagnetic valve to open and close can be indirectly known, no fuel is injected, and the condition that the fuel injector injects fuel is determined.
It should be noted that the electromagnetic valve of the fuel injector is an energy consumption element, and the fuel injector drives the electromagnetic valve through current when the electromagnetic valve is driven to open and close to inject fuel, so that the fuel injector can cause voltage fluctuation of the engine electronic control unit when the electromagnetic valve is driven, and whether the fuel injector drives the electromagnetic valve to inject fuel can be indirectly determined according to voltage change of the engine electronic control unit.
And S105, determining that the fuel oil sprayed by the fuel injector is normal.
According to the method provided by the embodiment of the invention, when the fuel oil injected by the fuel injector is determined to be normal, the fuel injector can be determined not to have a fault.
After the fuel injector is determined to inject the fuel normally, the injection data of the fuel injector during fuel injection can be obtained, the performance of the fuel injector is analyzed based on the preset theoretical injection quantity of the fuel and the actual injection quantity of the fuel in the injection data, and the working state of the fuel injector can be determined from the side; the kinetic energy converted by the injected fuel can be calculated according to the actual injection quantity of the fuel in the injection data, and the fuel injection quantity of the fuel injector can be further adjusted according to the kinetic energy and the driving state of the automobile.
And S106, determining that the fuel oil is abnormally injected by the fuel injector.
When the fuel oil injection of the fuel oil injector is determined to be abnormal, an alarm instruction is generated and sent to a preset alarm module to trigger the alarm module to alarm the abnormality, so that related personnel can be reminded of abnormal injection of the fuel oil injector. Further, when the fuel injection of the fuel injector is determined to be abnormal, the fault of the fuel injector can be determined.
The invention judges whether the fuel oil sprayed by the fuel injector is normal or not through the voltage fluctuation of the engine electronic control unit, thereby accurately detecting the real fuel oil spraying state of the fuel oil sprayed by the fuel injector, and giving an alarm when the fuel oil sprayed by the fuel injector is abnormal, which is beneficial to the analysis of engine faults.
In the method provided by the embodiment of the invention, under the condition that an engine electronic control unit sends a driving instruction to an oil injector to instruct the oil injector to inject fuel, the injection time when the oil injector receives the driving instruction is determined, a first time period before the injection time and a second time period after the injection time are determined, and a first voltage value of the engine electronic control unit in the first time period and a second voltage value of the engine electronic control unit in the second time period are collected; acquiring a voltage difference value between the first voltage value and the second voltage value, comparing the voltage difference value with a preset differential pressure threshold value, and further judging whether the voltage difference value is greater than the differential pressure threshold value or not; if the voltage difference value is larger than the pressure difference threshold value, determining that the fuel oil sprayed by the fuel injector is normal; and if the voltage difference value is not larger than the pressure difference threshold value, determining that the fuel oil sprayed by the fuel oil sprayer is abnormal. According to the invention, whether the fuel oil sprayed by the fuel oil sprayer is normal is judged through the voltage value of the engine electronic control unit before the spraying time and the voltage value after the spraying time, so that whether the fuel oil sprayed by the fuel oil sprayer is normal can be determined under the condition that the driving circuit of the engine and the fuel oil sprayer have no electrical fault, and the non-electrical fault of the fuel oil sprayer can be effectively detected; the method provided by the invention does not need to add a hardware circuit in the process of detecting whether the oil sprayer is abnormal, so that the detection cost is saved, and the method provided by the invention can be applied to various scenes and has strong universality.
In correspondence with the method shown in fig. 1, the invention provides a device for detecting an injector, which is used for supporting the application of the method shown in fig. 1 in practice, and the device can be applied to a control system of an automobile engine, and the structural schematic diagram of the device is shown in fig. 5, and is specifically described as follows:
the first determining unit 501 is configured to determine the injection time when the injector receives a driving instruction when the engine electronic control unit sends the driving instruction to the injector to instruct the injector to inject fuel;
a second determining unit 502, configured to determine a first time period before the injection time and a second time period after the injection time, where an ending time of the first time period is the injection time, and a starting time of the second time period is the injection time;
the acquisition unit 503 is used for acquiring a first voltage value of the engine electronic control unit in the first time period and a second voltage value of the engine electronic control unit in the second time period;
an obtaining unit 504, configured to obtain a voltage difference between the first voltage value and the second voltage value, compare the voltage difference with a preset differential threshold, and determine whether the voltage difference is greater than the differential threshold;
A third determining unit 505, configured to determine that the fuel oil injected by the fuel injector is normal if the voltage difference is greater than the pressure difference threshold;
a fourth determining unit 506, configured to determine that the fuel injector injects fuel abnormally if the voltage difference is not greater than the pressure difference threshold.
In the device provided by the embodiment of the invention, under the condition that an engine electronic control unit sends a driving instruction to an oil injector to instruct the oil injector to inject fuel, the injection time of the oil injector when receiving the driving instruction is determined, a first time period before the injection time and a second time period after the injection time are determined, and a first voltage value of the engine electronic control unit in the first time period and a second voltage value of the engine electronic control unit in the second time period are acquired; acquiring a voltage difference value between the first voltage value and the second voltage value, comparing the voltage difference value with a preset differential pressure threshold value, and further judging whether the voltage difference value is greater than the differential pressure threshold value; if the voltage difference value is larger than the pressure difference threshold value, determining that the fuel oil sprayed by the fuel injector is normal; and if the voltage difference value is not greater than the pressure difference threshold value, determining that the fuel oil is abnormally injected by the fuel injector. According to the invention, whether the fuel oil sprayed by the fuel injector is normal is judged through the voltage value of the engine electric control unit before the spraying time and the voltage fluctuation after the spraying time, so that whether the fuel injector works normally can be accurately determined under the condition that the fuel injector has no electrical fault, the problem that whether the fuel injector has a fault can not be determined under the condition that the fuel injector has no electrical fault in the prior art can be solved, no additional hardware circuit is required in the process, the detection cost is saved, and the method can be applied to various scenes.
Based on the apparatus provided in the foregoing embodiment, the acquisition unit 503 of the apparatus may be configured to:
the acquisition subunit is used for acquiring each first acquisition voltage value of the engine electronic control unit in the first time period and each second acquisition voltage value of the engine electronic control unit in the second time period based on a preset sampling frequency;
and the processing subunit is configured to perform median average filtering processing on each of the first collected voltage values and each of the second collected voltage values to obtain the first voltage value and the second voltage value.
Based on the apparatus provided in the foregoing embodiment, the processing subunit of the apparatus may be configured to:
the first operation module is used for screening out the first acquisition voltage value with the largest numerical value and the first acquisition voltage value with the smallest numerical value for each first acquisition voltage value, then carrying out arithmetic mean operation on each remaining first acquisition voltage value, and taking the numerical value obtained by the operation as the first voltage value;
and the second operation module is used for screening out the second acquisition voltage value with the largest numerical value and the second acquisition voltage value with the smallest numerical value for each second acquisition voltage value, then carrying out arithmetic mean operation on each remaining second acquisition voltage value, and taking the numerical value obtained by the operation as the second voltage value.
Based on the apparatus provided in the foregoing embodiment, the apparatus may be further configured to:
and the generating unit is used for generating an alarm instruction when the fuel oil sprayed by the fuel oil sprayer is abnormal, and sending the alarm instruction to a preset alarm module so as to trigger the alarm module to alarm for abnormity.
Based on the apparatus provided in the foregoing embodiment, the second determining unit 502 of the apparatus may be configured to:
the first determining submodule is used for determining a first acquisition time before the injection time and determining a second acquisition time after the injection time, wherein the first acquisition time is separated from the injection time by a preset time step, and the second acquisition time is separated from the injection time by the time step;
a second determination submodule configured to determine a time length from the first collection time to the injection time as the first period and determine a time length from the injection time to the second collection time as the second period.
An embodiment of the present invention further provides a storage medium, where the storage medium includes a stored instruction, and when the instruction runs, a device where the storage medium is located is controlled to perform the following operations:
Under the condition that an engine electronic control unit sends a driving instruction to an oil sprayer to instruct the oil sprayer to spray fuel oil, determining the spraying time when the oil sprayer receives the driving instruction;
determining a first time period before the injection time and determining a second time period after the injection time, wherein the end time of the first time period is the injection time, and the start time of the second time period is the injection time;
acquiring a first voltage value of the engine electronic control unit in the first time period and a second voltage value of the engine electronic control unit in the second time period;
acquiring a voltage difference value between the first voltage value and the second voltage value, comparing the voltage difference value with a preset differential pressure threshold value, and judging whether the voltage difference value is greater than the differential pressure threshold value;
if the voltage difference value is larger than the pressure difference threshold value, determining that the fuel oil is normally injected by the fuel injector;
and if the voltage difference value is not larger than the pressure difference threshold value, determining that the fuel oil is abnormally injected by the fuel injector.
An electronic device is provided in an embodiment of the present invention, and the structural diagram of the electronic device is shown in fig. 6, which specifically includes a memory 601 and one or more instructions 602, where the one or more instructions 602 are stored in the memory 601 and configured to be executed by one or more processors 603 to perform the following operations on the one or more instructions 602:
Under the condition that an engine electronic control unit sends a driving instruction to an oil sprayer to instruct the oil sprayer to spray fuel oil, determining the spraying time when the oil sprayer receives the driving instruction;
determining a first time period before the injection time and determining a second time period after the injection time, wherein the ending time of the first time period is the injection time, and the starting time of the second time period is the injection time;
acquiring a first voltage value of the engine electronic control unit in the first time period and a second voltage value of the engine electronic control unit in the second time period;
acquiring a voltage difference value between the first voltage value and the second voltage value, comparing the voltage difference value with a preset differential pressure threshold value, and judging whether the voltage difference value is greater than the differential pressure threshold value or not;
if the voltage difference value is larger than the pressure difference threshold value, determining that the fuel oil is normally injected by the fuel oil injector;
and if the voltage difference value is not larger than the pressure difference threshold value, determining that the fuel oil is abnormally injected by the fuel injector.
The specific implementation procedures and derivatives thereof of the above embodiments are within the scope of the present invention.
All the embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, the system or system embodiments, which are substantially similar to the method embodiments, are described in a relatively simple manner, and reference may be made to some descriptions of the method embodiments for relevant points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. One of ordinary skill in the art can understand and implement without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method of testing a fuel injector, comprising:
under the condition that an engine electronic control unit sends a driving instruction to an oil sprayer to instruct the oil sprayer to spray fuel oil, determining the spraying time when the oil sprayer receives the driving instruction;
determining a first time period before the injection time and determining a second time period after the injection time, wherein the ending time of the first time period is the injection time, and the starting time of the second time period is the injection time;
acquiring a first voltage value of the engine electronic control unit in the first time period and a second voltage value of the engine electronic control unit in the second time period;
Acquiring a voltage difference value between the first voltage value and the second voltage value, comparing the voltage difference value with a preset differential pressure threshold value, and judging whether the voltage difference value is greater than the differential pressure threshold value;
if the voltage difference value is larger than the pressure difference threshold value, determining that the fuel oil is normally injected by the fuel injector;
and if the voltage difference value is not larger than the pressure difference threshold value, determining that the fuel oil is abnormally injected by the fuel injector.
2. The method of claim 1, wherein said collecting a first voltage value of said engine ecu over said first time period and a second voltage value over said second time period comprises:
acquiring each first acquisition voltage value of the engine electronic control unit in the first time period and each second acquisition voltage value of the engine electronic control unit in the second time period based on a preset sampling frequency;
and carrying out median average filtering processing on each first collected voltage value and each second collected voltage value to obtain the first voltage value and the second voltage value.
3. The method of claim 2, wherein the performing median average filtering on each of the first collected voltage values and each of the second collected voltage values to obtain the first voltage values and the second voltage values comprises:
For each first acquisition voltage value, screening out the first acquisition voltage value with the largest numerical value and the first acquisition voltage value with the smallest numerical value, then performing arithmetic mean operation on the rest first acquisition voltage values, and taking the numerical value obtained through the arithmetic mean operation as the first voltage value;
and for each second acquisition voltage value, screening out the second acquisition voltage value with the largest numerical value and the second acquisition voltage value with the smallest numerical value, then performing arithmetic mean operation on the rest second acquisition voltage values, and taking the numerical value obtained through the arithmetic mean operation as the second voltage value.
4. The method of claim 1, further comprising:
when the fuel oil sprayed by the fuel oil sprayer is determined to be abnormal, an alarm instruction is generated and sent to a preset alarm module so as to trigger the alarm module to alarm for abnormity.
5. The method of claim 1, wherein said determining a first time period prior to said on-time and determining a second time period after said on-time comprises:
determining a first acquisition time before the injection time and determining a second acquisition time after the injection time, wherein the first acquisition time is separated from the injection time by a preset time step, and the second acquisition time is separated from the injection time by the time step;
Determining a time length of the first collection time to the injection time as the first time period, and determining a time length of the injection time to the second collection time as the second time period.
6. A fuel injector detecting apparatus, characterized by comprising:
the first determining unit is used for determining the injection time when the oil injector receives a driving instruction under the condition that the engine electronic control unit sends the driving instruction to the oil injector to indicate the oil injector to inject the fuel oil;
a second determination unit configured to determine a first time period before the injection time and a second time period after the injection time, wherein an end time of the first time period is the injection time, and a start time of the second time period is the injection time;
the acquisition unit is used for acquiring a first voltage value of the engine electronic control unit in the first time period and a second voltage value of the engine electronic control unit in the second time period;
the acquisition unit is used for acquiring a voltage difference value between the first voltage value and the second voltage value, comparing the voltage difference value with a preset differential pressure threshold value and judging whether the voltage difference value is larger than the differential pressure threshold value or not;
The third determining unit is used for determining that the fuel oil sprayed by the fuel oil sprayer is normal if the voltage difference value is larger than the pressure difference threshold value;
and the fourth determining unit is used for determining that the fuel oil is abnormally injected by the fuel oil injector if the voltage difference value is not larger than the pressure difference threshold value.
7. The apparatus of claim 6, wherein the acquisition unit comprises:
the acquisition subunit is used for acquiring each first acquisition voltage value of the engine electric control unit in the first time period and each second acquisition voltage value of the engine electric control unit in the second time period based on a preset sampling frequency;
and the processing subunit is used for performing median average filtering processing on each first collected voltage value and each second collected voltage value to obtain the first voltage value and the second voltage value.
8. The apparatus of claim 7, wherein the processing subunit comprises:
the first operation module is used for screening out the first acquisition voltage value with the largest numerical value and the first acquisition voltage value with the smallest numerical value for each first acquisition voltage value, then carrying out arithmetic mean operation on each remaining first acquisition voltage value, and taking the numerical value obtained by the operation as the first voltage value;
And the second operation module is used for screening out the second acquisition voltage value with the largest numerical value and the second acquisition voltage value with the smallest numerical value for each second acquisition voltage value, then performing arithmetic mean operation on the rest second acquisition voltage values, and taking the numerical value obtained through the arithmetic mean operation as the second voltage value.
9. The apparatus of claim 6, further comprising:
and the generating unit is used for generating an alarm instruction when the fuel oil sprayed by the fuel oil sprayer is abnormal, and sending the alarm instruction to a preset alarm module so as to trigger the alarm module to alarm for abnormity.
10. The apparatus of claim 6, wherein the second determining unit comprises:
the first determining submodule is used for determining a first acquisition time before the injection time and determining a second acquisition time after the injection time, wherein the first acquisition time is separated from the injection time by a preset time step, and the second acquisition time is separated from the injection time by the time step;
a second determination submodule configured to determine a time length from the first collection time to the injection time as the first period and determine a time length from the injection time to the second collection time as the second period.
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| CN114151257B (en) * | 2021-11-30 | 2023-03-03 | 东风商用车有限公司 | Method, device and equipment for diagnosing fuel injection quantity of fuel injector and readable storage medium |
| CN115199429B (en) * | 2022-06-08 | 2024-01-09 | 广西玉柴机器股份有限公司 | Fuel injection closed-loop monitoring method of fuel injector and related equipment |
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