CN111237072B - Electronic control diesel engine nozzle fault identification method and system and electronic control unit - Google Patents
Electronic control diesel engine nozzle fault identification method and system and electronic control unit Download PDFInfo
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- CN111237072B CN111237072B CN202010230849.3A CN202010230849A CN111237072B CN 111237072 B CN111237072 B CN 111237072B CN 202010230849 A CN202010230849 A CN 202010230849A CN 111237072 B CN111237072 B CN 111237072B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating or supervising devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D2041/224—Diagnosis of the fuel system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D2041/228—Warning displays
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The invention provides a method, a system and an electronic control unit for identifying the nozzle fault of an electric control diesel engine, wherein the method comprises the following steps: when the electronic control diesel engine meets the nozzle detection condition, acquiring nozzle detection parameters; judging whether the difference value between the first instantaneous rail pressure value and the second instantaneous rail pressure value corresponding to each cylinder is smaller than a preset rail pressure lower limit value or not; if yes, judging whether the tooth period corresponding to each of the N crankshaft teeth is larger than a preset average value or not; if yes, accumulating 1 for the abnormal times, and judging whether the cycle times reach the total cycle number or not; if yes, judging whether the abnormal times are larger than or equal to a limit value or not; if yes, outputting a nozzle fault signal; if the difference is greater than or equal to a preset rail lower limit value, or if the tooth period is less than or equal to a preset average value, or the cycle number does not reach the total cycle number, and the cycle number is accumulated to 1, the nozzle detection parameters are obtained again. The loss of engine performance caused by nozzle failure can be avoided, and the engine is ensured not to be damaged.
Description
Technical Field
The invention relates to the technical field of electric control diesel engines, in particular to a method and a system for identifying a nozzle fault of an electric control diesel engine and an electronic control unit.
Background
With the development of science and technology, the electric control diesel engine is widely applied in daily life. In the structure of the electric control diesel engine, a nozzle is an important part for realizing fuel injection in a fuel supply system of the electric control diesel engine, and the nozzle has the function of atomizing fuel into fine oil drops according to the characteristics of the formation of mixed gas of the electric control diesel engine and injecting the fine oil drops into a cylinder for combustion.
The inventor researches and discovers that after an oil injector nozzle of an electric Control diesel engine is blocked in the prior art, a fault code cannot be directly reported through an Electronic Control Unit (ECU), the fault position cannot be rapidly positioned, and even if the abnormal operation of the engine is found, the fault reason can be finally confirmed through manual maintenance. Because the fault position cannot be positioned in time, the continuous blockage of the nozzle of the oil injector can cause unsmooth oil injection, further the power of the engine is insufficient, and the performance of the engine is influenced.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method, a system, and an electronic control unit for identifying a nozzle fault of an electronically controlled diesel engine, which solve the problem that the engine performance is affected due to insufficient engine power caused by the inability to quickly locate a blockage fault position of the electronically controlled diesel engine nozzle in time.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
a method of electronically controlled diesel engine nozzle fault identification, the method comprising:
under the condition that an electronic control diesel engine meets nozzle detection conditions, nozzle detection parameters are obtained, wherein the nozzle detection parameters at least comprise a first instant rail pressure value of each cylinder of the electronic control diesel engine at a first moment before oil injection and a second instant rail pressure value of each cylinder at a second moment after oil injection, and tooth periods corresponding to N crankshaft teeth after the top dead center of each cylinder are obtained, and the value of N is determined based on the total number of cylinders of the electronic control diesel engine and the instant acceleration of the cylinders after normal ignition;
judging whether the difference value between the first instantaneous rail pressure value and the second instantaneous rail pressure value corresponding to each cylinder is smaller than a preset rail pressure lower limit value or not;
if the number of the crankshaft teeth is smaller than the preset rail reduction limit value, judging whether the tooth period corresponding to each of the N crankshaft teeth is larger than a preset average value or not;
if the number of the abnormal times is larger than the preset average value, accumulating 1 for the abnormal times, and judging whether the number of the circulating times reaches the total number of the circulating times;
if the number of the total cycles is reached, judging whether the abnormal times is larger than or equal to a limit value;
if the value is larger than or equal to the limit value, outputting a nozzle fault signal;
if the difference is greater than or equal to a preset rail pressure limit value, or if the tooth period corresponding to each of the N crankshaft teeth is less than or equal to a preset average value, or the cycle number does not reach the total cycle number, accumulating the cycle number by 1, and returning to the step of acquiring the nozzle detection parameter.
Optionally, the method further includes:
if the abnormal times are smaller than a limit value, clearing the cycle times and the abnormal times;
confirming whether the electrically-controlled diesel engine meets the nozzle detection condition or not;
if yes, the step of acquiring the nozzle detection parameters is executed in a returning mode.
Optionally, the nozzle detection condition includes:
the engine speed of the electric control diesel engine is in a stable state, the engine phase is synchronous, the intake flow variation value of the electric control diesel engine is within a preset range, the release state of the fuel injector of each cylinder of the electric control diesel engine is in a released state, and the fuel injector has no electric appliance fault signal output.
Optionally, the setting process of the preset rail lower limit value includes:
acquiring a rail pressure drop value under a normal state based on power-on time and a rail pressure value, wherein the power-on time refers to the time for driving a fuel injector, and the rail pressure drop value refers to the difference value of instantaneous rail pressure values of the cylinder in a first time period before fuel injection and in a second time period after fuel injection;
and taking the minimum value of the obtained rail pressure reduction values as a preset rail pressure reduction limit value.
Optionally, the setting process of the preset average value includes:
acquiring tooth periods corresponding to N crankshaft teeth after the top dead center of each cylinder in a normal state;
and calculating the average value of the tooth periods corresponding to the N crankshaft teeth respectively, and taking the average value as a preset average value.
An electronically controlled diesel engine nozzle failure identification system, the system comprising:
the detection unit is used for detecting whether the electronic control diesel engine meets the nozzle detection condition or not and executing the acquisition unit when the electronic control diesel engine meets the nozzle detection condition;
the acquisition unit is used for acquiring nozzle detection parameters, the nozzle detection parameters at least comprise a first instant rail pressure value of each cylinder of the electric control diesel engine at a first moment before oil injection and a second instant rail pressure value of each cylinder at a second moment after oil injection, and tooth periods corresponding to N crankshaft teeth after the top dead center of each cylinder are acquired, and the value of N is determined based on the total number of cylinders of the electric control diesel engine and the instant acceleration of the cylinders after normal ignition;
a judging unit, configured to judge whether a difference between the first instantaneous rail pressure value and the second instantaneous rail pressure value corresponding to each of the cylinders is smaller than a preset rail pressure reduction limit, judge whether a tooth period corresponding to each of the N crankshaft teeth is larger than a preset average value if the difference is smaller than the preset rail pressure reduction limit, and call an abnormal number counting unit if the difference is larger than the preset average value, and judging whether the cycle number reaches the total cycle number, if so, judging whether the abnormal number is more than or equal to the limit value, if so, executing a fault reminding unit, wherein, if the difference is greater than or equal to a preset rail reduction limit value, or if the tooth period corresponding to each of the N crankshaft teeth is less than or equal to a preset average value, or, if the cycle number does not reach the total cycle number, calling a cycle number counting unit and continuously executing the obtaining unit;
the abnormal frequency counting unit is used for performing accumulation operation on the abnormal frequency, and the abnormal frequency is accumulated by 1 every time the abnormal frequency is called;
the cycle number counting unit is used for performing accumulation operation on the cycle number, and the cycle number is accumulated by 1 every time the cycle number is called;
and the fault reminding unit is used for outputting a nozzle fault signal.
Optionally, the determining unit is further configured to execute a zero clearing unit if the number of times of the abnormality is smaller than a limit value;
and the zero clearing unit is used for clearing the cycle times and the abnormal times and continuously executing the detection unit.
Optionally, the method further includes:
the first setting unit is used for acquiring a rail pressure reduction value in a normal state based on power-on time and the rail pressure value, the power-on time refers to the time for driving the oil injector, the rail pressure reduction value refers to the difference value of instantaneous rail pressure values of the cylinder in a first time period before oil injection and a second time period after oil injection, and the minimum value of the acquired rail pressure reduction values is used as a preset rail pressure reduction limit value.
Optionally, the method further includes:
and the second setting unit is used for acquiring the tooth periods corresponding to the N crankshaft teeth after the top dead center of each cylinder in a normal state, calculating the average value of the tooth periods corresponding to the N crankshaft teeth, and taking the average value as a preset average value.
An Electronic Control Unit (ECU) comprises a processor and a memory, wherein a computer program is stored in the memory, and the processor is used for calling the computer program in the memory to execute the electronic control diesel engine nozzle fault identification method.
Compared with the prior art, the invention has the following beneficial effects:
the embodiment of the invention provides a method for identifying the nozzle fault of an electric control diesel engine, which comprises the steps of acquiring nozzle detection parameters under the condition that the electric control diesel engine meets nozzle detection conditions, wherein the nozzle detection parameters at least comprise a first instant rail pressure value of each cylinder of the electric control diesel engine at a first moment before oil injection and an instant rail pressure value of each cylinder at a second moment after the oil injection, and acquiring tooth periods corresponding to N crankshaft teeth after the top dead center of each cylinder, wherein the value of N is determined based on the total number of cylinders of the electric control diesel engine and the instant acceleration of the cylinders after normal ignition; judging whether the difference value between the first instantaneous rail pressure value and the second instantaneous rail pressure value corresponding to each cylinder is smaller than a preset rail pressure lower limit value or not; if the number of the crankshaft teeth is smaller than the preset rail reduction limit value, judging whether the tooth period corresponding to each of the N crankshaft teeth is larger than a preset average value or not; if the number of the abnormal times is larger than the preset average value, accumulating 1 for the abnormal times, and judging whether the number of the circulating times reaches the total number of the circulating times; if the total number of cycles is reached, judging whether the abnormal times are more than or equal to a limit value; if the value is larger than or equal to the limit value, outputting a nozzle fault signal; if the difference is greater than or equal to a preset rail pressure limit value, or if the tooth period corresponding to each of the N crankshaft teeth is less than or equal to a preset average value, or the cycle number does not reach the total cycle number, accumulating the cycle number by 1, and returning to the step of acquiring the nozzle detection parameter. By applying the method provided by the embodiment of the invention, when the nozzle of the oil sprayer is found to be blocked according to the rail pressure change before and after oil injection of each cylinder and the instantaneous acceleration after normal ignition, the fault is reported in time, and related personnel are reminded to troubleshoot the nozzle of the oil sprayer, so that the performance loss and potential safety hazard of an engine caused by the fault are avoided, and the engine is prevented from being damaged.
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 identifying a nozzle fault of an electronically controlled diesel engine according to an embodiment of the present invention;
FIG. 2 is a flow chart of another method for identifying a nozzle fault of an electronically controlled diesel engine according to an embodiment of the present invention;
FIG. 3 is a flowchart of another method for identifying a nozzle fault of an electronically controlled diesel engine according to an embodiment of the present invention;
FIG. 4 is a block diagram of a nozzle failure recognition system for an electronically controlled diesel engine according to an embodiment of the present invention;
fig. 5 is a block diagram of an electronic control unit ECU 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 a process, method, article, or apparatus that comprises the element.
As shown in fig. 1, an embodiment of the present invention provides a method for identifying a nozzle fault of an electronically controlled diesel engine, which may include the following steps:
s101: and detecting whether the electronically controlled diesel engine meets the nozzle detection condition, if not, continuing to return to the step S101, and if so, executing the step S102.
In S101, the nozzle detection condition may include: the engine speed of the electric control diesel engine is in a stable state, the engine phase is synchronous, the intake flow change value of the electric control diesel engine is in a preset range, the release state of the fuel injector of each cylinder of the electric control diesel engine is in a released state, and no electric appliance fault signal of the fuel injector is output.
If the electronic control diesel engine meets the nozzle detection condition, acquiring nozzle detection parameters; and if the electronically controlled diesel engine does not meet the nozzle detection condition, continuously returning to S101 to detect whether the electronically controlled diesel engine meets the nozzle detection condition.
Specifically, the nozzle detection condition may also include that various components of the engine are operating well, and the nozzle detection condition may be determined as the case may be, and the present application is not further limited herein.
S102: and acquiring nozzle detection parameters.
In S102, the nozzle detection parameter at least includes a first instantaneous rail pressure value of each cylinder of the electronically controlled diesel engine at a first time before fuel injection and a second instantaneous rail pressure value of each cylinder at a second time after fuel injection, and a tooth period corresponding to each of N crankshaft teeth after a top dead center of each cylinder is obtained, and a value of N is determined based on a total number of cylinders of the electronically controlled diesel engine and an instantaneous acceleration of the cylinders after normal ignition. And aiming at the value of N, the value of N is different according to different structures of different electric control diesel engines.
Specifically, the rail pressure value of each cylinder before and after oil injection can be changed, the rail pressure value at the first moment before oil injection can be used as a first instantaneous rail pressure value, and the rail pressure value at the second moment after oil injection can be used as a second instantaneous rail pressure value.
The tooth period corresponding to each of the N crankshaft teeth after the top dead center of each cylinder refers to the time corresponding to each of the rotating angles of the N crankshaft teeth after the cylinder is normally ignited.
S103: and judging whether the difference value between the first instantaneous rail pressure value and the second instantaneous rail pressure value corresponding to each cylinder is smaller than a preset rail reduction limit value or not, if so, executing S104, and if not, executing S101.
In S103, a difference between the first instantaneous rail pressure value and the second instantaneous rail pressure value corresponding to each cylinder is obtained by subtracting the first instantaneous rail pressure value and the second rail pressure value corresponding to each cylinder, and the obtained differences are compared with a preset rail pressure lower limit value to determine whether the difference is smaller than the preset rail pressure lower limit value.
If the difference value is smaller than the preset rail reduction limit value, further judging whether the tooth period corresponding to each of the N crankshaft teeth is larger than a preset average value or not; if the difference is larger than or equal to the preset rail lower limit value, returning to S101 to detect whether the electronically controlled diesel engine meets the nozzle detection condition.
S104: and judging whether the tooth period corresponding to each of the N crankshaft teeth is larger than a preset average value or not, if so, executing S105, and if not, executing S101.
In S104, if the difference between the first instantaneous rail pressure value and the second instantaneous rail pressure value in S103 is smaller than the preset rail pressure reduction limit, it is further determined whether the tooth period corresponding to each of the N crankshaft teeth is greater than the preset average value.
If the tooth period corresponding to each of the N crankshaft teeth is larger than the preset average value, the abnormal times are accumulated by 1, namely 1 abnormal time record is added on the basis of the original abnormal times; and if the tooth period corresponding to each of the N crankshaft teeth is less than or equal to the preset average value, returning to S101 to detect whether the electronically controlled diesel engine meets the nozzle detection condition.
S105: adding 1 to the abnormal times, judging whether the cycle times reach the total cycle number, and if so, executing S106; if not, S101 is executed.
In S105, if the tooth period corresponding to each of the N crank teeth in S104 is larger than the preset average value, the abnormality is recorded in a storage device associated with the engine electronic control unit ECU in an accumulation manner.
For example, when the tooth period corresponding to each of the N crank teeth is greater than the preset average value, 1 is added on the basis of the original abnormal number. Then, whether the circulation frequency reaches the total circulation number or not is further judged, and if the circulation frequency reaches the total circulation number, whether the abnormal frequency is larger than or equal to a limit value or not is further judged; and if the cycle times do not reach the total cycle number, returning to S101 to detect whether the electronically controlled diesel engine meets the nozzle detection condition. When setting total cycle number, can set for according to the field test effect, this application does not do further limit here.
S106: and judging whether the abnormal times are larger than or equal to the limit value, if so, executing S107, and if not, executing S108.
In S106, when the number of cycles reaches the total number of cycles, it is further determined whether or not the number of abnormal cycles is equal to or greater than a limit value, which may be set by a technician before the engine is shipped from a factory, or may be set by a person using the engine according to the aging condition of the engine. For example, before the engine leaves a factory, a technician may set the limit value to 2 because the nozzle of the engine is less blocked, and at the later stage, the technician may set the limit value to 4 because the engine is aged and has more faults.
And when the cycle number does not reach the total cycle number, accumulating 1 on the basis of the originally recorded cycle number, and then returning to S101 to detect whether the electronically controlled diesel engine meets the nozzle detection condition.
S107: and outputting a nozzle failure signal.
In S107, when the abnormal times is larger than or equal to the limit value, a nozzle fault signal is output and used for reminding relevant personnel to check the fault of the injector nozzle, so that the performance loss and potential safety hazard of the engine caused by the fault are avoided, and the engine is prevented from being damaged.
It should be noted that, one engine nozzle failure detection may involve a plurality of cycles, and the engine electronic control unit ECU ends 1 cycle from S101 to S107, and 1 cycle may be 2 revolutions of the crankshaft and 1 revolution of the camshaft, and each cylinder is operated once per cycle.
S108: and clearing the cycle times and the abnormal times.
In S108, if the number of abnormal times is smaller than the limit value, the number of cycles and the number of abnormal times are cleared. And after the cycle number and the abnormal number are cleared, ending the fault detection of the engine nozzle at this time. When the next time the nozzle fault of the engine is detected, the cycle number and the abnormal number can be recorded again so as to avoid counting disorder and cause the engine to generate nozzle fault misinformation.
And when the next time of the fault detection of the nozzle of the engine, determining whether the electronically controlled diesel engine meets the nozzle detection condition, and if the electronically controlled diesel engine meets the nozzle fault detection condition of the engine, acquiring the nozzle detection parameters again. The execution of S101, S102, S103, S104, S105, S106, and S108 may be completed in the order of one cycle.
In the method for identifying the nozzle fault of the electric control diesel engine, provided by the embodiment of the invention, under the condition that the electric control diesel engine meets the nozzle detection condition, a nozzle detection parameter is obtained, and whether the difference value between the first instantaneous rail pressure value and the second instantaneous rail pressure value corresponding to each cylinder is smaller than a preset rail pressure lower limit value or not is judged; if the number of the crankshaft teeth is smaller than the preset rail reduction limit value, judging whether the tooth period corresponding to each of the N crankshaft teeth is larger than a preset average value or not; if the number of the abnormal times is larger than the preset average value, accumulating 1 for the abnormal times, and judging whether the number of the circulating times reaches the total number of the circulating times; if the number of the total cycles is reached, judging whether the abnormal times is larger than or equal to a limit value; if the value is larger than or equal to the limit value, outputting a nozzle fault signal; if the difference is greater than or equal to a preset rail pressure limit value, or if the tooth period corresponding to each of the N crankshaft teeth is less than or equal to a preset average value, or the cycle number does not reach the total cycle number, accumulating the cycle number by 1, and returning to the step of acquiring the nozzle detection parameter. By applying the method for identifying the nozzle fault of the electric control diesel engine provided by the embodiment of the invention, when the nozzle of the oil injector is found to be blocked according to the rail pressure change before and after oil injection of each cylinder and the instantaneous acceleration after normal ignition, the fault is reported in time, related personnel are reminded to troubleshoot the nozzle of the oil injector, and the performance loss and potential safety hazard of the engine caused by the fault are avoided, so that the engine is prevented from being damaged.
As shown in fig. 2, in the method for identifying a nozzle fault of an electronically controlled diesel engine according to an embodiment of the present invention, based on the implementation process of S103, specifically, the process for setting the lower limit value of the preset rail pressure may include:
s201: and acquiring a rail voltage reduction value in a normal state based on the power-on time and the rail voltage value.
In S201, in the engine normal state, the rail pressure drop value is correlated with the energization time and the rail pressure value. Executing S201, a plurality of rail voltage drop values based on different power-up times and rail voltage values may be obtained.
Wherein, the power-on time refers to the time for driving the fuel injector, and the rail pressure reduction value refers to the difference value of the instantaneous rail pressure value of the cylinder in the first time before fuel injection and the second time after fuel injection.
It should be noted that, under normal conditions, the rail pressure will decrease instantaneously every time the injector injects oil, and under the same rail pressure, the longer the power-up time is, the more the oil is injected externally, the more the rail pressure decreases instantaneously, and if the rail pressure does not decrease or the rail pressure decreases too little, it indicates that no oil is actually injected or the oil injection amount is not matched with the power-up time. S202: and taking the minimum value of the obtained rail pressure reduction values as a preset rail pressure reduction limit value.
In S202, the minimum rail voltage drop value is determined according to the acquired rail voltage drop values under different power-up time conditions, and is used as the rail voltage drop limit value.
By applying the method for identifying the nozzle fault of the electronic control diesel engine, provided by the embodiment of the invention, the rail pressure reduction limit value under the normal condition of the engine can be set so as to be compared with the difference value between the first instantaneous rail pressure value and the second instantaneous rail pressure value before the oil injector injects oil, and thus whether the rail pressure change before and after the oil injector injects oil is normal or not can be determined.
As shown in fig. 3, in the method for identifying a nozzle fault of an electronically controlled diesel engine according to an embodiment of the present invention, in the implementation process of S104, specifically, the setting process of the preset average value may include:
s301: and acquiring the tooth period corresponding to each of the N crankshaft teeth after the top dead center of each cylinder in the normal state.
In S301, in the engine normal state, the tooth periods corresponding to each of the N crank teeth after the top dead center of each cylinder are acquired.
Wherein, the value of N is determined by the total number of cylinders of the electric control diesel engine and the instantaneous acceleration of the cylinders after normal ignition.
It should be noted that, for the value of N, the value of N is different according to different structures of different electrically controlled diesel engines. N can be considered to be fixed by a single engine model, and values of different engine models are different. Such as: the engine model is 4 cylinders, the number of the crankshaft teeth is 4, the angle of each crankshaft tooth is 6 degrees, and then the 4 crankshaft teeth correspond to 24 degrees. For a 4-cylinder engine, after any cylinder is normally ignited, the acceleration of the cylinder can be accelerated instantly within a section of angle, and the value of N is determined based on the section of angle and the angle of a crankshaft tooth. For example, if the angle is 12 degrees, then N may take on the value of 2.
Such as: the engine model is 6 cylinders, the number of the crankshaft teeth is 6, the angle of each crankshaft tooth is 6 degrees, and 6 crankshaft teeth correspond to 36 degrees. For a 6-cylinder engine, after any cylinder is normally ignited, the acceleration of the cylinder in a section of angle can be accelerated instantly, and the value of N is determined based on the section of angle and the angle of the crankshaft teeth. For example, if the angle is 24 degrees, then N may take on a value of 4.
S302: and calculating the average value of the tooth periods corresponding to the N crankshaft teeth respectively, and taking the average value as a preset average value.
In S302, the average value of the tooth periods corresponding to the N crank teeth is calculated, and the average value is set as a preset average value. Such as: respectively recording the time required by N crank teeth with the most obvious acceleration after the top dead center of each cylinder as Ti, wherein i represents the number of the cylinder, Ti can reflect the single-cylinder acceleration of each cylinder, and the smaller Ti is, the faster the single-cylinder acceleration is.
Specifically, the time average Ta of all cylinders can be obtained by dividing the sum of Ti of all cylinders by the number of cylinders.
By applying the method for identifying the nozzle fault of the electronic control diesel engine provided by the embodiment of the invention, the preset average value in the normal state of the engine is set so as to be convenient for comparing with the tooth period corresponding to each of the N crankshaft teeth after the top dead center of each cylinder, thereby determining whether the tooth period corresponding to each of the N crankshaft teeth after the top dead center of each cylinder is normal.
Corresponding to the above method embodiment, an embodiment of the present invention provides an electronically controlled diesel engine nozzle fault recognition system, which has a structure shown in fig. 4, where the electronically controlled diesel engine nozzle fault recognition system 400 may include:
the detection unit 401 is configured to detect whether the electronically controlled diesel engine meets the nozzle detection condition, and execute the obtaining unit when the electronically controlled diesel engine meets the nozzle detection condition;
the acquiring unit 402 is configured to acquire nozzle detection parameters, where the nozzle detection parameters at least include a first instantaneous rail pressure value of each cylinder of the electronically controlled diesel engine at a first time before oil injection and an instantaneous rail pressure value of each cylinder at a second time after oil injection, and acquire a tooth period corresponding to each of N crankshaft teeth after a top dead center of each cylinder, where a value of N is determined based on a total number of cylinders of the electronically controlled diesel engine and an instantaneous acceleration of each cylinder after normal ignition;
a determining unit 403, configured to determine whether a difference between the first instantaneous rail pressure value and the second instantaneous rail pressure value corresponding to each of the cylinders is smaller than a preset rail pressure limit, determine whether a tooth period corresponding to each of the N crankshaft teeth is greater than a preset average value if the difference is smaller than the preset rail pressure limit, and call an abnormal number counting unit if the difference is greater than the preset average value, and judging whether the cycle number reaches the total cycle number, if so, judging whether the abnormal number is more than or equal to the limit value, if so, executing a fault reminding unit, wherein, if the difference is greater than or equal to a preset rail reduction limit value, or if the tooth period corresponding to each of the N crankshaft teeth is less than or equal to a preset average value, or, if the cycle number does not reach the total cycle number, calling a cycle number counting unit and continuously executing the obtaining unit;
an abnormal number counting unit 404, configured to perform an accumulation operation on the abnormal number, where the abnormal number is accumulated by 1 every time the abnormal number is called;
a cycle count unit 405, configured to perform an accumulation operation on the cycle count, where the cycle count is accumulated by 1 every time the cycle count is called;
the failure reminding unit 406 is configured to output a nozzle failure signal.
In the system for identifying the nozzle fault of the electric control diesel engine provided by the embodiment of the invention, under the condition that the electric control diesel engine meets the nozzle detection condition, a nozzle detection parameter is obtained, and whether the difference value between the first instantaneous rail pressure value and the second instantaneous rail pressure value corresponding to each cylinder is smaller than a preset rail pressure lower limit value or not is judged; if the number of the crankshaft teeth is smaller than the preset rail reduction limit value, judging whether the tooth period corresponding to each of the N crankshaft teeth is larger than a preset average value or not; if the number of the abnormal times is larger than the preset average value, accumulating 1 for the abnormal times, and judging whether the number of the circulating times reaches the total number of the circulating times; if the number of the total cycles is reached, judging whether the abnormal times is larger than or equal to a limit value; if the value is larger than or equal to the limit value, outputting a nozzle fault signal; if the difference is greater than or equal to a preset rail pressure limit value, or if the tooth period corresponding to each of the N crankshaft teeth is less than or equal to a preset average value, or the cycle number does not reach the total cycle number, accumulating the cycle number by 1, and returning to the step of acquiring the nozzle detection parameter. By applying the electronic control diesel engine nozzle fault recognition system provided by the embodiment of the invention, when the fuel injector nozzle is found to be blocked according to the rail pressure change before and after fuel injection of each cylinder and the instantaneous acceleration after normal ignition, the fault is reported in time, related personnel are reminded to troubleshoot the fuel injector nozzle fault, and the performance loss and potential safety hazard of an engine caused by the fault are avoided, so that the engine is prevented from being damaged.
In the above system for identifying a nozzle fault of an electronically controlled diesel engine, the determining unit 403 is further configured to execute a zero clearing unit 407 if the number of abnormal times is less than a limit value;
the clearing unit 407 is configured to clear the cycle count and the abnormal count, and continue to execute the detection unit.
In the above-mentioned electronic control diesel engine nozzle fault recognition system, still include:
the first setting unit 408 is configured to obtain rail pressure drop values under different power-up time conditions in a normal state based on power-up time and the rail pressure values, where the power-up time refers to time for driving an injector, the rail pressure drop value refers to a difference between instantaneous rail pressure values of the cylinder in a first time period before injection and in a second time period after injection, and a minimum value of the obtained rail pressure drop values is used as a preset rail pressure drop limit value.
In the above-mentioned electronic control diesel engine nozzle fault recognition system, still include:
the second setting unit 409 is configured to obtain tooth periods corresponding to N crankshaft teeth after the top dead center of each cylinder in a normal state, calculate an average value of the tooth periods corresponding to the N crankshaft teeth, and use the average value as a preset average value.
By applying the electric control diesel engine fault recognition system provided by the embodiment of the invention, whether the nozzle of the oil injector is blocked or not can be recognized by acquiring the rail pressure change before and after oil injection of each cylinder and the tooth period corresponding to each of the N crankshaft teeth, faults are reported timely, related personnel are reminded to check the faults of the nozzle of the oil injector, and the performance loss and potential safety hazard of an engine caused by the faults are avoided, so that the engine is prevented from being damaged.
Referring to fig. 5, a block diagram of an ECU for controlling an electronically controlled diesel engine fault recognition system to perform detection according to an embodiment of the present invention, where the ECU is applied in a detection device of the electronically controlled diesel engine fault recognition system, and the ECU includes: a processor 501 and a memory 502.
The memory stores a computer program, and the processor is used for executing the computer program stored in the memory 502 to realize the detection of the electric control diesel engine fault identification system, and the realization process is as follows:
specifically, the processor executes the computer program stored in the memory to realize the detection process of the electric control diesel engine fault identification system as follows: under the condition that an electronic control diesel engine meets nozzle detection conditions, nozzle detection parameters are obtained, wherein the nozzle detection parameters at least comprise a first instant rail pressure value of each cylinder of the electronic control diesel engine at a first moment before oil injection and a second instant rail pressure value of each cylinder at a second moment after oil injection, and tooth periods corresponding to N crankshaft teeth after the top dead center of each cylinder are obtained, and the value of N is determined based on the total number of cylinders of the electronic control diesel engine and the instant acceleration of the cylinders after normal ignition; judging whether the difference value between the first instantaneous rail pressure value and the second instantaneous rail pressure value corresponding to each cylinder is smaller than a preset rail pressure lower limit value or not; if the number of the crankshaft teeth is smaller than the preset rail reduction limit value, judging whether the tooth period corresponding to each of the N crankshaft teeth is larger than a preset average value or not; if the number of the abnormal times is larger than the preset average value, accumulating 1 for the abnormal times, and judging whether the number of the circulating times reaches the total number of the circulating times; if the number of the total cycles is reached, judging whether the abnormal times is larger than or equal to a limit value; if the value is larger than or equal to the limit value, outputting a nozzle fault signal; if the difference is greater than or equal to a preset rail pressure limit value, or if the tooth period corresponding to each of the N crankshaft teeth is less than or equal to a preset average value, or the cycle number does not reach the total cycle number, accumulating the cycle number by 1, and returning to obtain the nozzle detection parameters.
By applying the electronic control unit ECU of the engine provided by the embodiment of the invention, when the nozzle of the oil injector is found to be blocked according to the rail pressure change before and after oil injection of each cylinder and the instantaneous acceleration after normal ignition, a fault is reported in time, related personnel are reminded to troubleshoot the nozzle of the oil injector, and the performance loss and the potential safety hazard of the engine caused by the fault are avoided, so that the engine is prevented from being damaged.
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. An electronically controlled diesel engine nozzle fault identification method, characterized in that the method comprises:
under the condition that an electronic control diesel engine meets nozzle detection conditions, nozzle detection parameters are obtained, wherein the nozzle detection parameters at least comprise a first instant rail pressure value of each cylinder of the electronic control diesel engine at a first moment before oil injection and a second instant rail pressure value of each cylinder at a second moment after oil injection, and tooth periods corresponding to N crankshaft teeth after the top dead center of each cylinder are obtained, and the value of N is determined based on the total number of cylinders of the electronic control diesel engine and the instant acceleration of the cylinders after normal ignition; the crankshaft teeth are the total time required for N crankshaft teeth to rotate through an angle after the cylinder is normally fired;
judging whether the difference value between the first instantaneous rail pressure value and the second instantaneous rail pressure value corresponding to each cylinder is smaller than a preset rail pressure lower limit value or not;
if the number of the crank shaft teeth is smaller than the preset rail lower limit value, judging whether the tooth periods corresponding to the N crank shaft teeth are larger than a preset average value or not;
if the number of the abnormal times is larger than the preset average value, accumulating 1 for the abnormal times, and judging whether the number of the circulating times reaches the total number of the circulating times;
if the number of the total cycles is reached, judging whether the abnormal times is larger than or equal to a limit value;
if the value is larger than or equal to the limit value, outputting a nozzle fault signal;
if the difference is greater than or equal to a preset rail pressure limit value, or if the tooth period corresponding to each of the N crankshaft teeth is less than or equal to a preset average value, or the cycle number does not reach the total cycle number, accumulating the cycle number by 1, and returning to the step of acquiring the nozzle detection parameter.
2. The method of claim 1, further comprising:
if the abnormal times are smaller than a limit value, clearing the cycle times and the abnormal times;
confirming whether the electrically-controlled diesel engine meets the nozzle detection condition or not;
if yes, the step of acquiring the nozzle detection parameters is executed in a returning mode.
3. The method of claim 1, wherein the nozzle detection condition comprises:
the engine speed of the electric control diesel engine is in a stable state, the engine phase is synchronous, the intake flow variation value of the electric control diesel engine is within a preset range, the release state of the fuel injector of each cylinder of the electric control diesel engine is in a released state, and the fuel injector has no electric appliance fault signal output.
4. The method according to claim 1, wherein the setting process of the preset rail lower limit value comprises:
acquiring a rail pressure drop value under a normal state based on power-on time and a rail pressure value, wherein the power-on time refers to the time for driving a fuel injector, and the rail pressure drop value refers to the difference value of instantaneous rail pressure values of the cylinder in a first time period before fuel injection and in a second time period after fuel injection;
and taking the minimum value of the obtained rail pressure reduction values as a preset rail pressure reduction limit value.
5. The method according to claim 1, wherein the setting process of the preset average value comprises:
acquiring tooth periods corresponding to N crankshaft teeth after the top dead center of each cylinder in a normal state;
and calculating the sum of the tooth periods of all the cylinders divided by the cylinders to obtain an average value, and taking the average value as a preset average value.
6. An electronically controlled diesel engine nozzle failure identification system, the system comprising:
the detection unit is used for detecting whether the electronic control diesel engine meets the nozzle detection condition or not and executing the acquisition unit when the electronic control diesel engine meets the nozzle detection condition;
the acquisition unit is used for acquiring nozzle detection parameters, the nozzle detection parameters at least comprise a first instant rail pressure value of each cylinder of the electric control diesel engine at a first moment before oil injection and a second instant rail pressure value of each cylinder at a second moment after oil injection, and tooth periods corresponding to N crankshaft teeth after the top dead center of each cylinder are acquired, and the value of N is determined based on the total number of cylinders of the electric control diesel engine and the instant acceleration of the cylinders after normal ignition; the crankshaft teeth are the total time required for N crankshaft teeth to rotate through an angle after the cylinder is normally fired;
a judging unit, configured to judge whether a difference between the first instantaneous rail pressure value and the second instantaneous rail pressure value corresponding to each of the cylinders is smaller than a preset rail pressure reduction limit, judge whether a tooth period corresponding to each of the N crankshaft teeth is larger than a preset average value if the difference is smaller than the preset rail pressure reduction limit, and call an abnormal number counting unit if the difference is larger than the preset average value, and judging whether the cycle number reaches the total cycle number, if so, judging whether the abnormal number is more than or equal to the limit value, if so, executing a fault reminding unit, wherein, if the difference is greater than or equal to a preset rail reduction limit value, or if the tooth period corresponding to each of the N crankshaft teeth is less than or equal to a preset average value, or, if the cycle number does not reach the total cycle number, calling a cycle number counting unit and continuously executing the obtaining unit;
the abnormal frequency counting unit is used for performing accumulation operation on the abnormal frequency, and the abnormal frequency is accumulated by 1 every time the abnormal frequency is called;
the cycle number counting unit is used for performing accumulation operation on the cycle number, and the cycle number is accumulated by 1 every time the cycle number is called;
and the fault reminding unit is used for outputting a nozzle fault signal.
7. The system according to claim 6, wherein the determining unit is further configured to execute a zero clearing unit if the number of times of abnormality is smaller than a limit value;
and the zero clearing unit is used for clearing the cycle times and the abnormal times and continuously executing the detection unit.
8. The system of claim 6, further comprising:
the first setting unit is used for acquiring a rail pressure reduction value in a normal state based on power-on time and the rail pressure value, the power-on time refers to the time for driving the oil injector, the rail pressure reduction value refers to the difference value of instantaneous rail pressure values of the cylinder in a first time period before oil injection and a second time period after oil injection, and the minimum value of the acquired rail pressure reduction values is used as a preset rail pressure reduction limit value.
9. The system of claim 6, further comprising:
and the second setting unit is used for acquiring the tooth periods corresponding to the N crankshaft teeth after the top dead center of each cylinder in a normal state, calculating the sum of the tooth periods of all the cylinders divided by the number of cylinders to obtain an average value, and taking the average value as a preset average value.
10. An Electronic Control Unit (ECU), characterized in that the ECU comprises a processor and a memory, wherein the memory stores a computer program, and the processor is used for calling the computer program in the memory to execute the method for identifying the nozzle fault of the electric control diesel engine according to any one of claims 1 to 5.
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