CN112414717A - Test method for engine oil dilution by post-injection fuel oil of engine - Google Patents
Test method for engine oil dilution by post-injection fuel oil of engine Download PDFInfo
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- CN112414717A CN112414717A CN202011186254.9A CN202011186254A CN112414717A CN 112414717 A CN112414717 A CN 112414717A CN 202011186254 A CN202011186254 A CN 202011186254A CN 112414717 A CN112414717 A CN 112414717A
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Abstract
The invention discloses a test method for diluting engine oil by post-injection fuel oil of an engine, which comprises the following steps of S1, selecting fuel oil post-injection parameters of the engine, and selecting test conditions of the engine; s2, enabling the engine to run under the working condition; s3, after the sampling time length of each time the engine runs, collecting an oil sample from the engine, and supplementing engine oil with the same volume as the oil sample; s4, after the engine finishes running and the running time is preset, acquiring the physicochemical indexes of all oil samples; and S5, if the engine oil dilution rate of all the oil samples is outside the preset safety range, adjusting the fuel post-injection parameters of the engine, keeping the test conditions of the engine unchanged, and performing the step S2 again until the engine oil dilution rate of all the oil samples is within the preset safety range. The test method for diluting the engine oil by the post-injection fuel oil of the engine can guarantee the service life of the engine and reduce the actual use cost and the maintenance cost of the engine.
Description
Technical Field
The invention relates to the technical field of engine tests, in particular to a method for testing the dilution of engine oil by post-injection fuel oil of an engine.
Background
In the regeneration process of a Diesel Particulate Filter (DPF) of a national six Diesel engine, Diesel oil sprayed from an HC nozzle or a remote nozzle enters an engine oil lubricating system to easily dilute engine oil, so that the establishment of a friction pair oil film is damaged, and the engine is damaged. Therefore, a test method is needed to improve the development and evaluation process of the national six-engine, ensure the durable service life mileage of the engine and reduce the actual use cost of the engine.
Disclosure of Invention
The invention aims to provide a test method for diluting engine oil by post-injection fuel oil of an engine, which can ensure the service life of the engine and reduce the actual use cost and maintenance cost of the engine.
In order to realize the technical effects, the technical scheme of the test method for diluting the engine oil by the post-injection fuel oil of the engine is as follows:
a test method for dilution of engine oil by post-injection fuel oil of an engine comprises the following steps: s1, selecting a fuel post-injection parameter of the engine, and selecting the operation condition of the engine, the operation condition of a regeneration cycle, the operation condition of the engine and the preset operation time of the engine; s2, enabling the engine to operate the operating condition; s3, after the sampling time length of each time the engine runs, collecting an oil sample from the engine, and supplementing engine oil with the same volume as the oil sample; s4, acquiring physicochemical indexes of all oil samples after the engine finishes running for the preset running time, wherein the physicochemical indexes comprise engine oil dilution rate; s5, if the engine oil dilution rate of all the oil samples is outside a preset safety range, adjusting the fuel post-injection parameters of the engine, keeping the operation condition of the engine, the operation condition of the regeneration cycle, the preset operation duration of the engine and the operation condition of the engine unchanged, and performing the steps S2-S4 again until the engine oil dilution rate of the oil samples is within the preset safety range.
Further, the preset running time of the engine comprises a first running total time, the first running total time is (the oil change mileage of the engine/the regeneration mileage of the engine) multiplied by the duration of the regeneration cycle multiplied by the safety factor, the preset running time is the first running total time, and the running condition of the regeneration cycle is that the regeneration cycle is continuously carried out in the running process of the engine.
Further, when the preset operation time of the engine is the first total operation time, the engine continuously operates for multiple times under the operation condition, and the sampling time is the operation time of the operation condition of the first preset times.
Further, the engine comprises an engine oxidation catalyst, the operating condition of the engine comprises a limit operating condition, the limit operating condition comprises setting the rotating speed of the engine to be a lowest rotating speed and/or setting the ignition temperature of the engine oxidation catalyst to be a lowest temperature, when the operating condition of the engine is the limit operating condition, the preset operating time of the engine is the time required by the regeneration cycle to operate for a second preset number of times, and the operating condition of the regeneration cycle is that the regeneration cycle is continuously performed during the operation of the engine.
Further, when the operating condition of the engine is the limit operating condition, the engine continuously operates for a plurality of times under the operating condition, and the sampling duration is the operating duration of the regeneration cycle.
Further, the preset operation time period of the engine is a second total operation time period, and the second total operation time period is the total oil consumption amount in the oil change period of the engine/the oil consumption speed of the operation condition.
Further, the engine includes a diesel particulate filter, the preset operation duration of the engine is the second total operation duration, the operation condition of the regeneration cycle is that the regeneration cycle is performed once when the accumulated carbon amount of the diesel particulate filter reaches a preset value, and the regeneration cycle is closed in the operation process of the engine.
Further, the sampling period is a period of time required for the accumulated carbon amount of the dpf to reach the preset value from an initial value plus a period of time required for the regeneration cycle.
Furthermore, after the engine runs for the first time for the sampling time period, the engine runs for other sampling time periods, the sampling time period is divided into a plurality of sample supplementing time periods, and after the engine runs for each time for the sample supplementing time period, one oil sample is collected from the engine and is supplemented with the engine oil with the same volume as the oil sample.
Further, in step S5, if the engine oil dilution ratios of all the oil samples are within the preset safety range, the post-injection parameters of the fuel oil of the engine are kept unchanged, the operation condition of the engine, the operation condition of the regeneration cycle, the preset operation duration of the engine and the operation condition of the engine are adjusted, and step S2 is performed again.
The invention has the beneficial effects that: according to the test method for diluting the engine oil by the post-injection fuel oil of the engine, due to the fact that the test can be conducted for multiple times aiming at the running environments of different engines, the safest post-injection parameter of the fuel oil in the engine oil regeneration cycle is obtained, the service life of the engine in the actual use process is guaranteed, the possibility that the engine is damaged due to unqualified physicochemical indexes of the engine oil is reduced, and the actual use cost and the maintenance cost of the engine are reduced.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a flow chart of a method for testing engine oil dilution with post-injection fuel for an engine provided in example 1 of the present invention;
FIG. 2 is a flow chart of a method for testing engine oil dilution with post-injection fuel for an engine provided in embodiment 2 of the present invention;
FIG. 3 is a flow chart of a method of testing engine oil dilution with post-injection fuel for an engine provided in embodiment 3 of the present invention;
FIG. 4 is a flowchart of a method for testing engine oil dilution with post-injection fuel in an engine according to embodiment 4 of the present invention.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
It will be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in an orientation or positional relationship indicated in the drawings for convenience and simplicity of description only and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
Specific steps of a method for testing engine oil dilution with post-injection fuel for an engine according to an embodiment of the present invention will be described with reference to fig. 1 to 4.
As shown in fig. 1-4, fig. 1 discloses a method for testing the dilution of engine oil by post-injection fuel of an engine, which comprises the following steps: s1, selecting a fuel post-injection parameter of the engine, selecting the operation condition of the engine, the operation condition of a regeneration cycle, the operation condition of the engine and the preset operation duration of the engine; s2, enabling the engine to run under the working condition; s3, after the sampling time length of each time the engine runs, collecting an oil sample from the engine, and supplementing engine oil with the same volume as the oil sample; s4, after the engine runs for a preset running time, acquiring the physicochemical indexes of all oil samples, wherein the physicochemical indexes comprise engine oil dilution rate; s5, if the engine oil dilution rate of all the oil samples is outside the preset safety range, adjusting the fuel post-injection parameters of the engine, keeping the operation condition of the engine, the operation condition of the regeneration cycle, the preset operation duration of the engine and the operation condition of the engine unchanged, and performing the steps S2-S4 again until the engine oil dilution rate of the oil samples is within the preset safety range.
It can be understood that after the operation condition of the engine, the operation condition of the regeneration cycle, the operation condition of the engine and the preset operation duration of the engine are selected, the engine and the regeneration cycle can be operated under the condition higher than the actual operation intensity of the engine and after the operation environment of the engine is determined, the physical and chemical indexes of engine oil in the engine are mainly influenced by the post-injection parameters of the fuel oil of the engine, and the engine can be operated according to the preset condition after the post-injection parameters of the fuel oil of the engine are selected. In the running process of the engine, an oil sample is collected from the engine every other sampling time period, engine oil with the same volume as the oil sample is supplemented, the physicochemical indexes of the engine oil obtained after the engine oil in the engine is diluted in different time periods within the preset running time period of the engine can be obtained, the influence of fuel oil on the engine oil under the action of the engine oil of the engine in a regeneration cycle can be conveniently obtained, the influence of the fuel oil on the physicochemical indexes of the engine oil in different running time periods of the engine can be conveniently analyzed, and the safe running time of the regeneration cycle can be confirmed according to the accumulated running time of the regeneration cycle when the physicochemical indexes of the engine oil exceed the safety range. If physicochemical indexes such as the engine oil dilution rate of an oil sample are not in a safe range, the negative influence on the engine oil of the engine can be caused when the fuel oil is sprayed according to the selected fuel oil post-injection parameters to complete the regeneration cycle.
According to the test method for diluting the engine oil by the post-injection fuel oil of the engine, due to the fact that the test can be conducted for multiple times aiming at the running environments of different engines, the safest post-injection fuel oil parameter in the engine oil regeneration cycle is obtained, the service life of the engine in the actual use process is guaranteed, the possibility that the engine is damaged due to unqualified physical and chemical indexes of the engine oil is reduced, and the actual use cost and the maintenance cost of the engine are reduced.
In some specific embodiments, the operating condition of the engine is a transient test cycle condition (WHTC condition), and of course, in other embodiments of the present invention, the operating condition of the engine can be determined according to the actual application requirements, and does not need to be specifically limited.
In some embodiments, the post-injection fuel parameters include volume, direction and pressure of fuel injection.
In some specific embodiments, the physicochemical indices of the engine oil include fuel dilution rate, metal content, kinematic viscosity, flash point, total base number, total acid number, and soot content. It can be understood that by detecting the metal content of the engine oil, the proportion range of the metal abraded by the engine entering the engine oil can be estimated, and the abrasion condition of the engine can be obtained.
In some embodiments, as shown in fig. 1 and 4, the preset operation period of the engine includes a first total operation period, where the first total operation period is (mileage of the engine/mileage of the engine regenerated) × duration of the regeneration cycle × safety factor, and the preset operation period is the first total operation period, where the operation condition of the regeneration cycle is that the regeneration cycle is continuously performed during the operation of the engine.
It can be understood that, in the test process of this embodiment, because the preset operation duration is the first total operation duration, the engine oil continues to perform the regeneration cycle in the operation process of the engine, so that the regeneration cycle also continues to operate the preset operation duration of the engine, and after the first total operation duration is set to (the oil change mileage of the engine/the regeneration mileage of the engine) × the duration of the regeneration cycle × the safety factor, the operation duration of the regeneration cycle in the test is the same as the regeneration cycle of the engine within the oil change mileage, and the regeneration cycle in the actual operation process of the engine can be simulated under a severe limit condition, so as to determine the influence of the selected post-injection fuel parameter on the engine oil after the regeneration cycle is completed according to the physical and chemical indexes of the collected oil sample. The first total operation time of the embodiment is determined according to the mileage of the engine and the regeneration cycle, so that the first total operation time is short, the regeneration cycle is continuously performed in the operation process of the engine, compared with the actual regeneration cycle, the regeneration cycle of the embodiment has harsh operation conditions, and the possibility that fuel particles which are not combusted fully enter engine oil is higher, so that whether the fuel post-injection parameters can enable the engine oil which completes the regeneration cycle to have reliable physicochemical indexes or not can be quickly determined, and the adjustment efficiency of the fuel post-injection parameters and the operation conditions of the engine is improved.
In some specific embodiments, the safety factor is 1.5. Of course, in other embodiments of the present invention, the safety factor can be determined according to actual requirements, and is not particularly limited.
In some embodiments, as shown in fig. 1 and 4, the engine is continuously operated for a plurality of operating conditions for a first predetermined total operating time period, and the sampling period is the operating period for the first predetermined number of operating conditions.
It can be understood that through the above test arrangement, the number of times of stopping the engine can be reduced, the oil sample with reliable sample size quantity can also be obtained, and meanwhile, the stable operation of the engine under the operation condition can be better ensured by the sampling time which is the multiple of the operation time of the operation condition.
In some specific embodiments, the first predetermined number of times is two. Of course, in other embodiments of the present invention, the first preset number can be determined according to actual requirements, and is not particularly limited.
In some embodiments, as shown in fig. 2 and 4, the engine includes an engine oxidation catalyst, the operating condition of the engine includes a limit operating condition, the limit operating condition includes setting a speed of the engine to a minimum speed and/or setting a light-off temperature of the engine oxidation catalyst to a minimum temperature, the preset operating duration of the engine is a duration required for the regeneration cycle to operate for a second preset number of times when the operating condition of the engine is the limit operating condition, and the operating condition of the regeneration cycle is such that the regeneration cycle continues to be performed during operation of the engine.
It can be understood that, in the actual regeneration cycle of the engine oil, the ignition temperature of the oxidation catalyst of the engine and the self rotating speed of the engine can influence the regeneration cycle, generally, the lower the ignition temperature and the lower the self rotating speed of the engine are, the more insufficient the combustion of the particulate matters in the regeneration cycle process is, the more the particulate matters enter the engine oil, and the phenomenon that the physicochemical indexes of the engine oil are not in a safe range is easily caused.
In some embodiments, as shown in fig. 2 and 4, when the operating condition of the engine is a limit operating condition, the engine is continuously operated for a plurality of operating conditions, and the sampling period is the operating period of the regeneration cycle.
It can be understood that the sampling time is the influence of the regeneration cycle in the actual operation of the engine on the engine oil, and the sampling time can be conveniently simulated, so that the collection of the oil sample can be conveniently realized, and the test convenience is improved on the premise of ensuring the test accuracy.
In some embodiments, as shown in fig. 3 and 4, the preset operation duration of the engine is a second total operation duration, which is the total fuel consumption/the fuel consumption speed of the operating condition in the oil change period of the engine.
It can be understood that the second total operation time period is calculated according to the oil consumption during the actual operation of the engine and the oil consumption speed of the operation condition of the engine, so that the operation time of the engine during the test can better simulate the actual operation time of the engine. In the test process of the embodiment, the preset running time of the engine is the second running total time, so that the engine can be relatively close to the actual running scene of the engine in the test process, the similarity between the collected oil sample and the physical and chemical indexes of the engine oil in the actual running of the engine is improved, the test reliability is improved, and the fuel oil parameters can be conveniently adjusted.
In some specific embodiments, the total fuel consumption in the oil change period of the engine is equal to the oil change mileage of the engine/the gas consumption of the engine, and the fuel consumption rate of the operating condition is equal to the cycle fuel consumption of the WHTC.
In some embodiments, as shown in fig. 3 and 4, the engine includes a diesel particulate filter, the preset operating period of the engine is the second total operating period, the operating condition of the regeneration cycle is that the regeneration cycle is performed once when the accumulated carbon amount of the diesel particulate filter reaches the preset value, and the regeneration cycle is closed during the operation of the engine.
It can be understood that, because the regeneration cycle is the particulate matter that the engine oxidation catalyst converter burns the diesel particulate filter and collects in fact, the operating condition of the regeneration cycle is to carry out the regeneration cycle again when the accumulated carbon amount of the diesel particulate filter reaches the preset value, the regeneration cycle in the actual operation process of the simulation engine that can be better, and can prevent the damage of the diesel particulate filter, can also accomplish many times of operation and many times of regeneration cycle's service environment's many oil samples to the engine and carry out the physical and chemical index test, thereby the influence that the good confirmation fuel post-injection parameter caused to the physical and chemical index of engine oil in the engine actual use process, the reliability of the experiment has been improved.
In some embodiments, as shown in fig. 3 and 4, the sampling period is the period of time required for the accumulated carbon amount of the dpf to reach a preset value from an initial value plus the period of time required for the regeneration cycle.
It can be understood that the test operation of the engine can be better ensured through the arrangement.
In some specific embodiments, after the regeneration cycle is finished, the engine is idled for a preset time and then oil sample collection is performed, so that the idling of the engine can enable fuel oil entering the engine oil to be mixed with the engine oil more fully, and the reliability of physical and chemical index analysis of the oil sample is improved.
Illustratively, the preset time is 10 minutes.
In some specific embodiments, when the preset operation duration of the engine is the second total operation duration, in step S2, before the operation condition of the engine, the engine is idled for a preset time, an oil sample is taken out, and then engine oil with the same volume as the oil sample is added, so that the initial oil sample can be better collected and cleaned.
In some embodiments, as shown in fig. 3 and 4, after the first sampling period of the engine operation, the other sampling periods of the engine operation are divided into a plurality of sample supplementing periods, and after each sample supplementing period of the engine operation, one oil sample is collected from the engine and one engine oil with the same volume as the oil sample is supplemented.
It can be understood that when the engine runs at other sampling time intervals, multiple oil samples are sequentially taken out of the engine along with the running of the engine in each sampling time interval, and the change condition of the physical and chemical indexes of the engine oil after being diluted between two regeneration cycles can be observed, so that the reliability of the test is improved.
In some embodiments, as shown in fig. 4, in step S5, if the oil dilution ratio of all the oil samples is within the preset safety range, the fuel post-injection parameter of the engine is kept unchanged, the operation condition of the engine, the operation condition of the regeneration cycle, the preset operation duration of the engine and the operation condition of the engine are adjusted, and step S2 is performed again.
It can be understood that, when the operation condition of the engine, the operation condition of the regeneration cycle, the preset operation duration of the engine, and the operation condition of the engine simulate the actual operation condition of the engine, it is generally difficult to complete the simulation of the actual operation condition of the engine and the change of the physicochemical index of the engine oil of the engine in the limit operation state.
Example 1:
the method of testing engine oil dilution with post-injection fuel for an engine according to one embodiment of the present invention is described below with reference to fig. 1.
The method for testing the dilution of the engine oil by the post-injection fuel oil of the engine comprises the following steps:
s1, selecting a fuel post-injection parameter of the engine, selecting an operation condition of the engine, an operation condition of a regeneration cycle, an operation condition of the engine and a preset operation time length of the engine, wherein the operation condition of the engine is a WHTC (white good fuel economy) condition, the preset operation time length of the engine is a first total operation time length, the first total operation time length is (oil change mileage of the engine/regeneration mileage of the engine) multiplied by duration of the regeneration cycle multiplied by a safety factor, the operation condition of the regeneration cycle is that the regeneration cycle is continuously carried out in the operation process of the engine, the engine continuously operates for multiple times under the operation condition, and the sampling time length is the operation time length of the operation condition of the first preset times;
s2, enabling the engine to run under the working condition;
s3, after the sampling time length of each time the engine runs, collecting an oil sample from the engine, and supplementing engine oil with the same volume as the oil sample;
s4, after the engine runs for a preset running time, acquiring the physicochemical indexes of all oil samples, wherein the physicochemical indexes comprise engine oil dilution rate;
and S5, if the engine oil dilution rate of all the oil samples is outside the preset safety range, adjusting the fuel post-injection parameters of the engine, keeping the operation condition of the engine, the operation condition of the regeneration cycle, the preset operation time of the engine and the operation condition of the engine unchanged, and performing the step S2 again.
Example 2:
the method of testing the dilution of engine oil with post-injection fuel for an engine according to one embodiment of the present invention is described below with reference to fig. 2.
The method for testing the dilution of the engine oil by the post-injection fuel oil of the engine comprises the following steps:
s1, selecting a fuel post-injection parameter of the engine, selecting an operation condition of the engine, an operation condition of a regeneration cycle, an operation condition of the engine and a preset operation duration of the engine, wherein the operation condition of the engine is a WHTC (white good thermal coefficient) condition, the operation condition of the engine is that the rotation speed of the engine is set to be the lowest rotation speed and/or the ignition temperature of an oxidation catalyst of the engine is set to be the lowest temperature, when the operation condition of the engine is a limit operation condition, the preset operation duration of the engine is the duration required by the second preset number of times of regeneration cycle operation, the operation condition of the regeneration cycle is that the regeneration cycle is continuously performed in the operation process of the engine, and the sampling duration is the operation duration of the regeneration;
s2, enabling the engine to run under the working condition;
s3, after the sampling time length of each time the engine runs, collecting an oil sample from the engine, and supplementing engine oil with the same volume as the oil sample;
s4, after the engine runs for a preset running time, acquiring the physicochemical indexes of all oil samples, wherein the physicochemical indexes comprise engine oil dilution rate;
and S5, if the engine oil dilution rate of all the oil samples is outside the preset safety range, adjusting the fuel post-injection parameters of the engine, keeping the operation condition of the engine, the operation condition of the regeneration cycle, the preset operation time of the engine and the operation condition of the engine unchanged, and performing the step S2 again.
Example 3:
the method of testing the dilution of engine oil with post-injection fuel for an engine according to one embodiment of the present invention is described below with reference to fig. 3.
The method for testing the dilution of the engine oil by the post-injection fuel oil of the engine comprises the following steps:
s1, selecting a fuel post-injection parameter of the engine, selecting an operation condition of the engine, an operation condition of a regeneration cycle, an operation condition of the engine and a preset operation time length of the engine, wherein the operation condition of the engine is a WHTC (white good fuel temperature) condition, the preset operation time length of the engine is a second total operation time length, the second total operation time length is the total fuel consumption amount/the fuel consumption speed of the operation condition in a fuel change period of the engine, the operation condition of the regeneration cycle is that a regeneration cycle is carried out when the accumulated carbon quantity of the diesel particle filter reaches a preset value, the regeneration cycle is closed in the operation process of the engine, and the sampling time length is the sum of the required time length when the accumulated carbon quantity of the diesel particle filter reaches the preset value from an initial value and the required time;
s2, enabling the engine to run under the working condition;
s3, after the sampling time length of each running of the engine, collecting one oil sample from the engine, and supplementing one engine oil with the same volume as the oil sample, after the sampling time length of the first running of the engine and the other sampling time lengths of the running of the engine, dividing the sampling time length into a plurality of sample supplementing time lengths, after the sample supplementing time length of each running of the engine, collecting one oil sample from the engine, and supplementing one engine oil with the same volume as the oil sample;
s4, after the engine runs for a preset running time, acquiring the physicochemical indexes of all oil samples, wherein the physicochemical indexes comprise engine oil dilution rate;
and S5, if the engine oil dilution rate of all the oil samples is outside the preset safety range, adjusting the fuel post-injection parameters of the engine, keeping the operation condition of the engine, the operation condition of the regeneration cycle, the preset operation time of the engine and the operation condition of the engine unchanged, and performing the step S2 again.
Example 4:
the method of testing the dilution of engine oil with post-injection fuel for an engine according to one embodiment of the present invention is described below with reference to fig. 4.
The method for testing the dilution of the engine oil by the post-injection fuel oil of the engine comprises the following steps:
s1, selecting a fuel post-injection parameter of the engine, setting the operation condition of the engine as a WHTC (white gas temperature coefficient) condition, setting the preset operation duration of the engine as a first total operation duration, wherein the first total operation duration is (oil change mileage of the engine/regeneration mileage of the engine) multiplied by the duration of a regeneration cycle multiplied by a safety factor, the operation condition of the regeneration cycle is that the regeneration cycle is continuously carried out in the operation process of the engine, the engine continuously operates for a plurality of times of operation conditions, and the sampling duration is the operation duration of the operation conditions of the first preset times;
s2, enabling the engine to run under the working condition;
s3, after the sampling time length of each time the engine runs, collecting an oil sample from the engine, and supplementing engine oil with the same volume as the oil sample;
s4, after the engine runs for a preset running time, acquiring the physicochemical indexes of all oil samples, wherein the physicochemical indexes comprise engine oil dilution rate;
s5, if the engine oil dilution rate of all the oil samples is outside the preset safety range, adjusting the fuel post-injection parameters of the engine, keeping the operation condition of the engine, the operation condition of the regeneration cycle, the preset operation duration of the engine and the operation condition of the engine unchanged, and executing the steps S2-S4 again until the engine oil dilution rate of all the oil samples is within the preset safety range;
s6, keeping the fuel post-injection parameters of the engine unchanged, adjusting the operation condition of the engine to set the rotation speed of the engine to be the lowest rotation speed and/or set the ignition temperature of an oxidation catalyst of the engine to be the lowest temperature, when the operation condition of the engine is the limit operation condition, the preset operation time of the engine is the time required by the second preset number of times of the operation of the regeneration cycle, the operation condition of the regeneration cycle is that the regeneration cycle is continuously carried out in the operation process of the engine, the sampling time is the operation time of the regeneration cycle, and executing the steps S2-S5 until the engine oil dilution rate of all oil samples is within the preset safety range;
s7, keeping the fuel post-injection parameter of the engine unchanged, adjusting the preset operation duration of the engine to be a second total operation duration, wherein the second total operation duration is the total fuel consumption amount in the oil change period of the engine/the fuel consumption speed of the operation condition, the operation condition of the regeneration cycle is that a regeneration cycle is carried out when the accumulated carbon amount of the diesel particulate filter reaches a preset value, the regeneration cycle is closed in the operation process of the engine, the sampling duration is the sum of the required duration of the accumulated carbon amount of the diesel particulate filter from the initial value to the preset value and the required duration of the regeneration cycle, and the steps S2-S4 are executed.
According to the method for testing the dilution of the engine oil by the post-injection fuel of the engine, firstly, through the steps S1-S5, the most extreme working condition is tested in the step S1 to obtain more reliable fuel post-injection parameters; through the step S6, the fuel post-injection parameters obtained in the steps S1-S5 can be rapidly detected to ensure that the parameters are reliable, and the oil samples obtained by the parameters obtained in the steps S1-S5 can be analyzed and evaluated as a rapid test scheme of the step S7; and finally, through the step S7 which is closest to the actual working condition, the oil sample can be comprehensively evaluated, so that more detailed and reliable related data can be obtained.
In the description herein, references to the description of "some embodiments," "other embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.
Claims (10)
1. A test method for engine oil dilution by post-injection fuel oil of an engine is characterized by comprising the following steps:
s1, selecting a fuel post-injection parameter of the engine, and selecting the operation condition of the engine, the operation condition of a regeneration cycle, the operation condition of the engine and the preset operation time of the engine;
s2, enabling the engine to operate the operating condition;
s3, after the sampling time length of each time the engine runs, collecting an oil sample from the engine, and supplementing engine oil with the same volume as the oil sample;
s4, acquiring physicochemical indexes of all oil samples after the engine finishes running for the preset running time, wherein the physicochemical indexes comprise engine oil dilution rate;
s5, if the engine oil dilution rate of all the oil samples is outside a preset safety range, adjusting the fuel post-injection parameters of the engine, keeping the operation condition of the engine, the operation condition of the regeneration cycle, the preset operation duration of the engine and the operation condition of the engine unchanged, and performing the steps S2-S4 again until the engine oil dilution rate of the oil samples is within the preset safety range.
2. The method for testing the dilution of engine oil by post-injection fuel oil of an engine according to claim 1, wherein the preset operation duration of the engine comprises a first total operation duration (the oil change mileage of the engine/the regeneration mileage of the engine) x the duration of the regeneration cycle x a safety factor, and the operation condition of the regeneration cycle is that the regeneration cycle is continuously performed during the operation of the engine when the preset operation duration is the first total operation duration.
3. The method for testing dilution of engine oil with post-injection oil of an engine according to claim 2, wherein when the preset operation duration of the engine is the first total operation duration, the engine continuously operates for a plurality of times of the operation condition, and the sampling duration is the operation duration of the operation condition for the first preset number of times.
4. The method for testing dilution of engine oil with post-injection fuel oil of claim 1, wherein the engine comprises an engine oxidation catalyst, the operating condition of the engine comprises a limit operating condition, the limit operating condition comprises setting a rotating speed of the engine to a minimum rotating speed and/or setting a light-off temperature of the engine oxidation catalyst to a minimum temperature, the operating condition of the engine is the limit operating condition, a preset operating time period of the engine is a time period required by the regeneration cycle to operate for a second preset number of times, and the operating condition of the regeneration cycle is that the regeneration cycle is continuously performed during the operation of the engine.
5. The method for testing dilution of engine oil with post-injection oil of an engine according to claim 4, wherein when the operating condition of the engine is the limit operating condition, the engine is continuously operated for a plurality of times under the operating condition, and the sampling period is an operating period of the regeneration cycle.
6. The method for testing the dilution of engine oil by post-injection fuel oil of an engine according to claim 1, wherein the preset operation time period of the engine is a second total operation time period, and the second total operation time period is the total oil consumption in the oil change period of the engine/the oil consumption speed of the operation condition.
7. The method of claim 6, wherein the engine includes a diesel particulate filter, the predetermined operating duration of the engine is the second total operating duration, the operating condition of the regeneration cycle is that the regeneration cycle is performed once when the accumulated carbon amount of the diesel particulate filter reaches a predetermined value, and the regeneration cycle is closed during the operation of the engine.
8. The method of claim 7, wherein the sampling period is a period of time required for the accumulated carbon amount of the dpf to reach the preset value from an initial value plus a period of time required for the regeneration cycle.
9. The method of claim 8, wherein the sampling duration is divided into a plurality of sample supplementing durations after the first sampling duration of engine operation and other sampling durations of engine operation, and one sample of the oil is collected from the engine after each sampling duration of engine operation, and one volume of the engine oil equal to the volume of the oil sample is supplemented.
10. The method for testing dilution of engine oil with post-injection fuel according to any one of claims 1-9, wherein in step S5, if the oil dilution ratio of all the oil samples is within the preset safety range, the post-injection fuel parameters of the engine are kept unchanged, the operation condition of the engine is adjusted, the operation condition of the regeneration cycle is adjusted, the preset operation duration of the engine is adjusted, and the operation condition of the engine is adjusted, and step S2 is performed again.
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