CN112031973B - Diesel engine fuel injection quantity deviation intervention type diagnosis method and system - Google Patents
Diesel engine fuel injection quantity deviation intervention type diagnosis method and system Download PDFInfo
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- CN112031973B CN112031973B CN202010881652.6A CN202010881652A CN112031973B CN 112031973 B CN112031973 B CN 112031973B CN 202010881652 A CN202010881652 A CN 202010881652A CN 112031973 B CN112031973 B CN 112031973B
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- 238000002347 injection Methods 0.000 title claims abstract description 129
- 239000007924 injection Substances 0.000 title claims abstract description 129
- 239000000446 fuel Substances 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000003745 diagnosis Methods 0.000 title claims abstract description 24
- 230000002159 abnormal effect Effects 0.000 claims abstract description 28
- 239000003921 oil Substances 0.000 claims description 121
- 230000002441 reversible effect Effects 0.000 claims description 11
- 238000001514 detection method Methods 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000002283 diesel fuel Substances 0.000 claims description 4
- 239000010705 motor oil Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 8
- 238000004590 computer program Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 230000005856 abnormality Effects 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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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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- 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
- F02M65/003—Measuring variation of fuel pressure in high pressure line
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- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a diesel engine fuel injection quantity deviation intervention type diagnosis method and a system, relating to the field of engines. And (4) acquiring the rail pressure drop of each cylinder, comparing the rail pressure drop with a preset rail pressure drop value and the rail pressure drops of the cylinders, and determining whether the oil injection quantity of each cylinder of the engine is abnormal or not. The method can quickly and effectively judge whether each cylinder in the diesel engine has abnormal fuel injection quantity.
Description
Technical Field
The invention relates to the field of engines, in particular to a diesel engine fuel injection quantity deviation intervention type diagnosis method and system.
Background
The fuel injector in the conventional generator is not provided with a flow sensor, and therefore, when the fuel injector needs to be checked, the diagnosis of the fuel injection amount cannot be directly performed.
There are several current mainstream approaches, the first of which is an alternative that is tested by monitoring the long term effect of injector failure on the emission control system. The second method is to adopt special stable working conditions to see the fluctuation of the rotating speed and detect the abnormal oil injection quantity of a certain cylinder through regular rotating speed fluctuation. And the third method is to calculate the volume of the injected fuel by establishing a corresponding relation model of the rail pressure drop and the injected fuel.
In the method, the first method is to monitor the long-term influence of the failure of the oil sprayer on the emission control system, the method is to simulate the blocked oil sprayer, and the scheme can only monitor the data of the final oil sprayer when the oil sprayer is completely blocked; the second method is that the rotating speed fluctuation is observed under a special stable working condition, and the method has the fixed defect that if the two-stage speed regulation function is in effect, the deviation of the oil quantity adjusted after the intervention of the speed regulation function and the oil injection quantity generated by the abnormal oil injection of an actual single oil injector cannot be decoupled; the non-speed regulation section cannot effectively eliminate interference caused by the action of an intake throttle valve and EGR or the switching of combustion control related parameters and the like. Meanwhile, the condition that the oil injection of each cylinder is attenuated or blocked cannot be integrally monitored and identified. In the third scheme, the actual fuel injection amount is calculated through a model by establishing a relation model between a rail pressure drop model and the fuel injection amount, and meanwhile, the accuracy of the model established by the method is also limited by the influence of combustion parameters.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a diesel engine fuel injection quantity deviation intrusive diagnosis method and system, which can quickly and effectively detect whether the fuel injectors corresponding to all cylinders of an engine and the whole engine have deviation.
In order to achieve the above object, in a first aspect, an embodiment of the present invention provides a method for intervention diagnosis of fuel injection quantity deviation of a diesel engine:
when the selected parameter of the engine in the reverse dragging mode is within a preset threshold range, sequentially injecting oil with a preset oil quantity into cylinders in the working cycle of each cylinder of the engine;
and (4) acquiring the rail pressure drop of each cylinder, comparing the rail pressure drop with a preset rail pressure drop value and the rail pressure drops of the cylinders, and determining whether the oil injection quantity of each cylinder of the engine is abnormal or not.
As an optional implementation, the preset rail pressure drop value is confirmed by:
obtaining the flow cross-sectional area A of the high-pressure oil pipe1Flow coefficient CdTo obtain a presetThe oil injection quantity;
obtaining the pressure P before the injection of the common rail piperailAnd pressure P after common rail injectionrail2And inputting the fuel injection quantity and the preset fuel injection quantity into a Bernoulli equation of the flow of the outflow hydraulic cavity together, and calculating to obtain the preset rail pressure drop value qinj。
As an alternative embodiment, the preset rail pressure drop value q isinjThe calculation formula is as follows:
as an alternative embodiment, said selected parameter of the engine in reverse-drive mode being within a predetermined threshold range, which in turn injects a predetermined amount of oil into the cylinders of the engine over a working cycle of each cylinder, comprises:
presetting a rail pressure threshold range of an engine;
acquiring the rail pressure of the engine in real time, and detecting the running mode of the engine when the engine is in the range of the rail pressure threshold value;
if the engine is in the reverse-dragging mode, an oil injection instruction is sent out;
the engine receives an oil injection command and sequentially injects oil with preset oil quantity in the working cycle of each cylinder.
As an optional embodiment, the comparing the rail pressure drop of each cylinder with a preset rail pressure drop value to determine whether the fuel injection amount of each cylinder of the engine is abnormal includes:
comparing the rail pressure drop of each cylinder with a preset rail pressure drop value one by one, and comparing the rail pressure drops of the cylinders with each other:
if the deviation of only a single cylinder exceeds a preset value, determining that the oil injection quantity of the cylinder is abnormal;
and if the deviation of all the cylinders exceeds a preset value, determining that the fuel injection quantity of the engine is abnormal.
As an optional embodiment, the preset parameters include: the engine water temperature, the engine rail pressure, the engine oil pressure and the engine rotating speed.
In a second aspect, the present invention also provides a diesel engine fuel injection amount deviation intervention type diagnosis device, including:
the fuel injection module is used for injecting oil with preset oil quantity into cylinders in a working cycle of each cylinder of the engine in sequence when the selected parameter of the engine in the reverse dragging mode is within a preset threshold range;
and the detection module is used for detecting the rail pressure drop of each cylinder, comparing the rail pressure drop with a preset rail pressure drop value and the rail pressure drop of each cylinder, and determining whether the oil injection quantity of each cylinder of the engine is abnormal or not.
As an optional embodiment, it further comprises a calculation module for:
obtaining the flow cross-sectional area A of the high-pressure oil pipe1Flow coefficient CdObtaining a preset oil injection quantity;
obtaining the pressure P before the injection of the common rail piperailAnd pressure P after common rail injectionrail2And inputting the preset fuel injection quantity into a Bernoulli equation of the flow of the outflow hydraulic cavity, and calculating to obtain the preset rail pressure drop value qinj。
As an alternative embodiment, the fuel injection module is further configured to:
presetting a rail pressure threshold range of an engine;
acquiring the rail pressure of the engine in real time, and detecting the running mode of the engine when the engine is in the range of the rail pressure threshold value;
when the engine is in a reverse-dragging mode, an oil injection instruction is sent out;
the engine receives an oil injection command and sequentially injects oil with preset oil quantity in the working cycle of each cylinder.
As an optional embodiment, the detection module is further configured to:
comparing the rail pressure drop of each cylinder with a preset rail pressure drop value one by one, and comparing the rail pressure drops of the cylinders with each other:
if only a single cylinder has obvious deviation, determining that the oil injection quantity of the cylinder is abnormal;
and if all cylinders have obvious deviation, determining that the fuel injection quantity of the engine is abnormal.
Compared with the prior art, the invention has the advantages that:
the invention discloses a diesel engine fuel injection quantity deviation intervention type diagnosis method and a system thereof, which confirm the relation between rail pressure drop and fuel injection quantity when an engine is in a reverse-dragging mode. In the reverse-dragging mode, the engine can not actively spray oil, under the condition, the invention actively sprays oil to form a set oil spraying quantity, the rail pressure drop is directly related to the oil spraying, and the relationship between the rail pressure drop and the oil spraying can be very intuitively and effectively analyzed, so that whether the single oil spraying of any cylinder is normal or not can be confirmed.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings corresponding to the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart illustrating the steps of an embodiment of a method for intrusive diagnosis of fuel injection quantity deviation of a diesel engine according to the present invention;
FIG. 2 is a flow chart illustrating steps of another embodiment of a method for intrusive diesel fuel injection quantity deviation diagnosis in accordance with the present invention;
FIG. 3 is a flow chart illustrating steps of another embodiment of a method for intrusive diesel fuel injection quantity deviation diagnosis in accordance with the present invention;
fig. 4 is a flowchart illustrating steps of another embodiment of a method for intrusive diagnosis of fuel injection quantity deviation of a diesel engine according to the present invention.
Detailed Description
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
The embodiment of the invention provides a diesel engine fuel injection quantity deviation interventional diagnosis method and a system, which can effectively evaluate the fuel injection quantity of a certain fuel injector or the excessive deviation of the fuel injection quantity of a plurality of fuel injectors through the pressure drop deviation caused by each injection.
In order to achieve the technical effects, the general idea of the application is as follows:
when the selected parameter of the engine in the reverse dragging mode is within a preset threshold range, sequentially injecting oil with a preset oil quantity into cylinders in the working cycle of each cylinder of the engine;
and (4) acquiring the rail pressure drop of each cylinder, comparing the rail pressure drop with a preset rail pressure drop value and the rail pressure drops of the cylinders, and determining whether the oil injection quantity of each cylinder of the engine is abnormal or not.
In conclusion, the engine can be further diagnosed when the enabling condition of the engine is met. The specific enabling condition comprises that the engine is in a reverse-dragging mode, and the selected parameter is within a preset threshold range. In the reverse dragging mode, the engine can not actively inject oil, but actively inject oil in the reverse dragging mode and detect rail pressure drop, so that the rail pressure drop is influenced by only oil injection, the relation between oil injection and rail pressure drop can be analyzed, and whether the oil injection quantity is abnormal or not can be diagnosed.
Compared with the long-term influence on an emission control system by monitoring the failure of an oil sprayer in the prior art, the scheme is more direct and effective; compared with the method for checking the fluctuation of the rotating speed under the special stable working condition, the method has no influence of other additional factors and is more accurate.
It should be noted that the selected parameter is within a preset threshold range for checking to confirm that the engine is in a normal operating state, and the selected parameter may be engine water temperature, engine rail pressure, engine oil pressure, engine speed, or the like, or a combination of multiple parameters, as long as the engine is confirmed to be in a normal operating state.
In order to better understand the technical solution, the following detailed description is made with reference to specific embodiments.
Referring to fig. 1, an embodiment of the present invention provides a method for intervention diagnosis of a fuel injection quantity deviation of a diesel engine, including:
s1, when the selected parameter of the engine in the reverse-dragging mode is in the preset threshold range, sequentially injecting oil with preset oil quantity into the cylinders in the working cycle of each cylinder of the engine;
according to the scheme, the intervention type injection is carried out in the reverse-dragging mode of the engine, so that the interference of rail pressure fluctuation caused by combustion parameters or combustion state changes is greatly reduced. In other words, the influence factors of the rail pressure fluctuation are controlled within the minimum range by the set oil quantity and the set crank angle interval in the reverse dragging state of the engine, and the monitoring precision can be effectively improved.
For example, in a case where the engine water temperature is stable during a WHTC (world wide uniform transient cycle) cycle, that is, in a predetermined rail pressure range, when the engine enters the reverse-motoring mode, a smaller amount of oil is designated to allow the cylinders to sequentially inject the oil by issuing an intervening injection command. When the rail pressure is stable, the fuel is injected in a predetermined amount.
As a preferred embodiment, referring to fig. 2, step S1 includes the steps of:
s101, presetting a rail pressure threshold range of an engine;
s102, acquiring the rail pressure of the engine in real time, and detecting the running mode of the engine when the engine is in the rail pressure threshold range;
if the engine is in the reverse-dragging mode, an oil injection instruction is sent out;
the engine receives an oil injection command and sequentially injects oil with preset oil quantity in the working cycle of each cylinder.
It should be noted that, in order to ensure that the factors affecting the oil injection by different cylinders are as consistent as possible, the oil injection can be performed at a fixed rotation angle of the crankshaft, and preferably, the oil injection is performed at fixed intervals of 120 degrees of the crankshaft rotation angle for a 6-cylinder engine and at intervals of 180 degrees of the crankshaft rotation angle for a 4-cylinder engine.
And S2, acquiring the rail pressure drop of each cylinder, comparing the rail pressure drop with a preset rail pressure drop value and the rail pressure drop of each cylinder, and determining whether the oil injection quantity of each cylinder of the engine is abnormal or not.
For example, the rail pressure drop of each cylinder is obtained, and then the first one is compared with a preset rail pressure drop value according to two comparison modes; and the second comparison before the pressure drop of each cylinder rail can identify the abnormal oil injection quantity of a certain cylinder with higher precision.
It should be noted that, after the engine is configured to be in the anti-dragging mode and actively inject oil, the rail pressure drop of each cylinder needs to be actually detected after the only factor is the oil injection quantity.
Meanwhile, because the fuel injection quantity is established, static leakage is also considered, the rail pressure drop of the engine is a value within a set range, namely the rail pressure drop value is preset, and the actual rail pressure drop is compared with the preset rail pressure drop value, so that whether the fuel injection of a cylinder corresponding to the engine is normal or not can be analyzed through whether the actual rail pressure drop exceeds the range or not.
Furthermore, the rail pressure drop of the cylinders of the engine is compared one by one, whether the single cylinder of the engine has a problem or not can be determined, whether the single cylinder of the engine has an integral deviation or not can also be determined, and the method for comparing the rail pressure drop with the preset rail pressure drop value can ensure higher comparison precision.
As a preferred embodiment, the preset rail pressure drop value is confirmed by:
obtaining the flow cross-sectional area A of the high-pressure oil pipe1Flow coefficient CdObtaining a preset oil injection quantity;
obtaining the pressure P before the injection of the common rail piperailAnd pressure P after common rail injectionrail2And inputting the fuel injection quantity and the preset fuel injection quantity into a Bernoulli equation of the flow of the outflow hydraulic cavity together, and calculating to obtain the preset rail pressure drop value qinj。
The preset rail pressure drop value qinjThe calculation formula is as follows:
the common rail pipe is an interface for connecting the high-pressure oil pump and the oil injector, the pressure on the common rail pipe can change after the oil injector injects oil, but the change can be influenced by the oil inlet of the oil quantity metering unit, the rail pressure control stability, the oil return flow, the signal fluctuation of the rail pressure sensor and the like, so that the interference is eliminated as much as possible.
In the single injection process, the pressure drop of the oil injector end is transmitted to the common rail pipe, so that a pressure drop can be generated in the common rail pipe, the pressure drop can be understood as the Bernoulli equation of the flow out of the hydraulic cavity and is shown in a formula, and the pressure drop is in a set range under the condition of certain oil output.
Specifically, referring to fig. 3, step S2 includes the following steps:
s201, comparing the rail pressure drop of each cylinder with a preset rail pressure drop value one by one, and comparing the rail pressure drops of the cylinders with each other:
s202, if the deviation of only one cylinder exceeds a preset value, determining that the oil injection quantity of the cylinder is abnormal;
s203, if the deviation of all the cylinders exceeds a preset value, determining that the fuel injection quantity of the engine is abnormal.
By monitoring the running state of the engine, when the engine is in a reverse-dragging mode, in a proper range, an intervention type injection command is given to specify a smaller oil quantity command, each cylinder completes one injection in sequence at an equal crank angle in a complete working cycle, the rail pressure before and after the injection is recorded in each injection process, and the oil quantity metering unit supplements the oil quantity to maintain the rail pressure to the level before the injection after each injection.
Referring to fig. 4, an alternative embodiment of the present invention comprises the steps of:
t1, electrifying an engine ignition switch to ensure that no fuel oil system related current fault exists in the system, T2, the engine runs normally, after the standby oil pressure, the water temperature and the like reach the normal running conditions of the engine, the rotating speed of the engine reaches the limit range, and if the engine is monitored to be in the reverse dragging mode, turning to the step T3;
t3, keeping the rail pressure of the reverse-dragging mode unchanged, and specifying an oil injector of one cylinder of the engine to inject according to the set oil injection quantity at the set crank angle and recording the rail pressure drop caused by injection;
t4, immediately supplementing oil quantity through an oil quantity metering unit after injection is finished, so that rail pressure in the common rail pipe returns to pressure before injection, and if abnormality occurs in the oil injection process of an oil injector, the oil injection rail pressure drop judgment of the cylinder is invalid
T6, repeating the steps T3 and T4 to measure rail pressure drops corresponding to 1, 5, 3, 6, 2 and 4 cylinders in sequence;
and T7, comparing the recorded rail pressure drop of the corresponding oil injector of each cylinder, if a certain cylinder or multiple cylinders exceed a set limit value, judging that the oil injection quantity of the corresponding oil injector exceeding the limit is abnormal, if no abnormality exists, judging that the oil injection quantity of each cylinder is not abnormal, and if abnormality exists, reporting.
Based on the same inventive concept, the present application provides another embodiment of an intervention type diagnosis device for fuel injection quantity deviation of a diesel engine, comprising:
the fuel injection module is used for injecting oil with preset oil quantity into cylinders in a working cycle of each cylinder of the engine in sequence when the selected parameter of the engine in the reverse dragging mode is within a preset threshold range;
and the detection module is used for detecting the rail pressure drop of each cylinder, comparing the rail pressure drop with a preset rail pressure drop value and the rail pressure drop of each cylinder, and determining whether the oil injection quantity of each cylinder of the engine is abnormal or not.
Preferably, it further comprises a calculation module for:
obtaining the flow cross-sectional area A of the high-pressure oil pipe1Flow coefficient CdObtaining a preset oil injection quantity;
obtaining the pressure P before the injection of the common rail piperailAnd pressure P after common rail injectionrail2And inputting the preset fuel injection quantity into a Bernoulli equation of the flow of the outflow hydraulic cavity, and calculating to obtain the preset rail pressure drop value qinj。
Further, the fuel injection module is further configured to:
presetting a rail pressure threshold range of an engine;
acquiring the rail pressure of the engine in real time, and detecting the running mode of the engine when the engine is in the range of the rail pressure threshold value;
when the engine is in a reverse-dragging mode, an oil injection instruction is sent out;
the engine receives an oil injection command and sequentially injects oil with preset oil quantity in the working cycle of each cylinder.
Optionally, the detection module is further configured to:
comparing the rail pressure drop of each cylinder with a preset rail pressure drop value one by one, and comparing the rail pressure drops of the cylinders with each other:
if only a single cylinder has obvious deviation, determining that the oil injection quantity of the cylinder is abnormal;
and if all cylinders have obvious deviation, determining that the fuel injection quantity of the engine is abnormal.
Various modifications and specific examples in the foregoing method embodiments are also applicable to the system of the present embodiment, and the detailed description of the method is clear to those skilled in the art, so that the detailed description is omitted here for the sake of brevity.
Generally, compared with the conventional technology and the like, the fuel injection quantity deviation intrusive diagnosis method and the fuel injection quantity deviation intrusive diagnosis system for the diesel engine, provided by the embodiment of the invention, can quickly and effectively detect whether the deviation exists in the fuel injectors corresponding to the cylinders of the engine and the whole engine through more characteristics.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A diesel engine fuel injection quantity deviation intervention type diagnosis method is characterized by comprising the following steps:
when the selected parameter of the engine in the reverse dragging mode is within a preset threshold range, sequentially injecting oil with a preset oil quantity into cylinders in the working cycle of each cylinder of the engine;
acquiring the rail pressure drop of each cylinder, comparing the rail pressure drop with a preset rail pressure drop value and the rail pressure drops of the cylinders, and determining whether the oil injection quantity of each cylinder of the engine is abnormal or not;
compare the rail pressure drop of each jar with the rail pressure drop numerical value of predetermineeing, confirm whether each jar fuel injection quantity of engine is unusual, include:
comparing the rail pressure drop of each cylinder with a preset rail pressure drop value one by one, and comparing the rail pressure drops of the cylinders with each other:
if the deviation of only a single cylinder exceeds a preset value, determining that the oil injection quantity of the cylinder is abnormal;
and if the deviation of all the cylinders exceeds a preset value, determining that the fuel injection quantity of the engine is abnormal.
2. The method for the intrusive diagnosis of the deviation of the fuel injection quantity of the diesel engine as set forth in claim 1, wherein the preset rail pressure drop value is confirmed in a manner that:
obtaining the flow sectional area A1 and the flow coefficient Cd of the high-pressure oil pipe to obtain the preset oil injection quantity;
and acquiring pressure Prail before the injection of the common rail pipe and pressure Prail2 after the injection of the common rail pipe, inputting the pressure Prail and the preset oil injection quantity into a Bernoulli equation of the flow out of the hydraulic cavity together, and calculating to obtain the preset rail pressure drop value qinj.
3. The method for the intrusive diagnosis of the deviation of the fuel injection quantity of the diesel engine as set forth in claim 2, wherein the preset rail pressure drop value qinj is calculated by the formula:
4. the method of claim 1, wherein the step of injecting the predetermined amount of fuel into the cylinders during the operating cycle of the cylinders of the engine sequentially while the selected parameter of the engine in the reverse mode is within the predetermined threshold range comprises:
presetting a rail pressure threshold range of an engine;
acquiring the rail pressure of the engine in real time, and detecting the running mode of the engine when the engine is in the range of the rail pressure threshold value;
if the engine is in the reverse-dragging mode, an oil injection instruction is sent out;
the engine receives an oil injection command and sequentially injects oil with preset oil quantity in the working cycle of each cylinder.
5. The diesel engine fuel injection quantity deviation intrusive diagnosis method as recited in claim 1, characterized in that: the preset parameters include: the engine water temperature, the engine rail pressure, the engine oil pressure and the engine rotating speed.
6. A diesel engine fuel injection quantity deviation intervention type diagnostic device is characterized by comprising:
the fuel injection module is used for injecting oil with preset oil quantity into cylinders in a working cycle of each cylinder of the engine in sequence when the selected parameter of the engine in the reverse dragging mode is within a preset threshold range;
the detection module is used for detecting the rail pressure drop of each cylinder, comparing the rail pressure drop with a preset rail pressure drop value and the rail pressure drops of the cylinders with each other, and determining whether the oil injection quantity of each cylinder of the engine is abnormal or not;
the detection module is further configured to:
comparing the rail pressure drop of each cylinder with a preset rail pressure drop value one by one, and comparing the rail pressure drops of the cylinders with each other:
if only a single cylinder has obvious deviation, determining that the oil injection quantity of the cylinder is abnormal;
and if all cylinders have obvious deviation, determining that the fuel injection quantity of the engine is abnormal.
7. The diesel fuel injection quantity deviation interventional diagnosis device as set forth in claim 6, further comprising a calculation module for:
obtaining the flow sectional area A1 and the flow coefficient Cd of the high-pressure oil pipe to obtain the preset oil injection quantity;
and acquiring pressure Prail before the injection of the common rail pipe and pressure Prail2 after the injection of the common rail pipe, inputting the pressure Prail and the preset oil injection quantity into a Bernoulli equation of the flow out of the hydraulic cavity, and calculating to obtain the preset rail pressure drop value qinj.
8. The diesel fuel injection quantity deviation intervention-type diagnosis device as claimed in claim 6, wherein the fuel injection module is further configured to:
presetting a rail pressure threshold range of an engine;
acquiring the rail pressure of the engine in real time, and detecting the running mode of the engine when the engine is in the range of the rail pressure threshold value;
when the engine is in a reverse-dragging mode, an oil injection instruction is sent out;
the engine receives an oil injection command and sequentially injects oil with preset oil quantity in the working cycle of each cylinder.
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| CN113719368B (en) * | 2021-08-25 | 2023-05-12 | 东风商用车有限公司 | Method for diagnosing clamping stagnation fault of mechanical pressure release valve of fuel rail and fuel system |
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