CN113624503B - Method for evaluating low-speed pre-ignition generation and inhibition of gasoline engine oil - Google Patents
Method for evaluating low-speed pre-ignition generation and inhibition of gasoline engine oil Download PDFInfo
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- CN113624503B CN113624503B CN202110933192.1A CN202110933192A CN113624503B CN 113624503 B CN113624503 B CN 113624503B CN 202110933192 A CN202110933192 A CN 202110933192A CN 113624503 B CN113624503 B CN 113624503B
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
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- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/05—Testing internal-combustion engines by combined monitoring of two or more different engine parameters
Abstract
The invention discloses a method for evaluating low-speed pre-ignition generation and inhibition of gasoline engine oil, which comprises the following steps: replacing engine oil in an engine with engine oil to be evaluated, and assembling equipment for evaluating the generation and inhibition of pre-ignition on the engine; operating a carbon deposit removing working condition; operating an engine oil flushing working condition; running a pre-running working condition; increasing blow-by gas in the engine to create conditions for engine oil to enter the combustion chamber; running a low-speed pre-ignition test working condition; and under the low-speed pre-ignition test working condition, evaluating the generation and inhibition of low-speed pre-ignition of the gasoline engine oil. The method for evaluating the low-speed pre-ignition generation and inhibition of the gasoline engine oil can realize the accurate evaluation of the inhibition of the engine oil pre-ignition, effectively confirm the low-speed pre-ignition caused by the gasoline engine oil, avoid invalid tests, avoid the inaccurate evaluation of the engine oil with different specifications, be beneficial to the matching development of the engine oil in the engine development and avoid the damage of parts caused by the application of the engine oil with the unsuitable specification to the engine.
Description
Technical Field
The invention relates to the technical field of low-speed pre-ignition, in particular to a method for evaluating the generation and inhibition of low-speed pre-ignition of gasoline engine oil.
Background
In the engine, especially the direct injection gasoline engine, under the working condition of low speed and large load, the advanced combustion caused by the self-ignition of the mixed gas before the ignition of the spark plug is called low speed pre-ignition. Low speed pre-ignition may cause super knock, causing engine damage. The influencing factors of low-speed pre-ignition comprise factors such as engine design, carbon deposition in a combustion chamber, fuel oil, engine oil, in-cylinder heat point distribution and the like, and the engine oil is one of the influencing factors of the pre-ignition. The low-speed pre-ignition problem of the supercharged direct-injection engine can be inhibited to a certain extent through the formula improvement of the engine oil, such as the adjustment of the grade of the base oil, the adjustment of the content and proportion of elements such as calcium, magnesium and the like in the formula of the additive and the like, and the formation of spontaneous combustion hot spots in a combustion chamber is avoided.
At present, with the continuous upgrading of emission regulations, a series of new technologies of engines are continuously used, higher requirements are put forward on gasoline engine oil, and the international standard of the engine oil and the independent standards of various main engine plants are continuously upgraded. The requirements on the pre-ignition inhibition, energy conservation, service cycle and the like of the gasoline engine oil are increased, wherein the evaluation of the pre-ignition inhibition of the gasoline engine oil is an index of the latest specification engine oil.
The research and development of formula and blending are carried out by oil agent companies of engine oil, SN + standard engine oil is produced and applied, the index requirement on low-speed pre-ignition (pre-ignition times under a certain combustion cycle) is increased, and some automobile companies use autonomous engines to evaluate the low-speed pre-ignition. Generally, a cylinder pressure sensor is adopted to measure the combustion pressure under a certain combustion cycle, and the frequency of super detonation is recorded and is lower than the frequency required by engine oil of a corresponding specification. The international universal standards API, ACEA and various host factories generally define engine assembly, test working conditions and test circulation, and due to the fact that the factors of pre-ignition triggering are more and accidental, the problem of evaluating the pre-ignition inhibition of gasoline and engine oil is solved if the combustion pressure is ultrahigh and super-knock is caused by the engine oil.
Therefore, a method for evaluating the generation and inhibition of low-speed pre-ignition of gasoline engine oil is needed.
Disclosure of Invention
The invention aims to provide a method for evaluating the generation and inhibition of low-speed pre-ignition of gasoline engine oil, which solves the problems in the prior art and can effectively confirm the low-speed pre-ignition caused by the gasoline engine oil.
The invention provides a method for evaluating low-speed pre-ignition generation and inhibition of gasoline engine oil, which comprises the following steps:
replacing engine oil in an engine with engine oil to be evaluated, and assembling equipment for evaluating the generation and inhibition of pre-ignition on the engine;
operating a carbon cleaning working condition;
operating an engine oil flushing working condition;
running a pre-running working condition;
increasing blow-by gas in the engine to create conditions for engine oil to enter the combustion chamber;
running a low-speed pre-ignition test working condition;
and under the low-speed pre-ignition test working condition, evaluating the generation and inhibition of low-speed pre-ignition of the gasoline engine oil.
The method for evaluating the low-speed pre-ignition generation and inhibition of the gasoline engine oil preferably comprises the following steps of replacing the engine oil in the engine with the engine oil to be evaluated, and assembling equipment for evaluating the pre-ignition generation and inhibition on the engine, wherein the equipment comprises the following specific components:
selecting a new engine assembled according to a normal design standard or an old engine meeting the design standard;
completing running-in of the selected new engine according to a conventional running-in specification, or confirming the performance of the selected old engine;
replacing the engine oil in the selected new engine or old engine with the engine oil to be evaluated;
an apparatus for evaluating the generation and inhibition of pre-ignition, which includes a combustion analyzer, a cylinder pressure sensor, and a data collector, is assembled on a new engine or an old engine to be replaced with engine oil to be evaluated.
The method for evaluating the low-speed pre-ignition generation and inhibition of the gasoline engine oil, wherein preferably, the operating carbon deposit clearing working condition specifically comprises the following steps:
and (4) running the carbon cleaning working condition at full speed and full load through the test bench, wherein the running time is 1-3 hours.
The method for evaluating the low-speed pre-ignition generation and inhibition of the gasoline engine oil preferably includes:
and running the engine oil flushing working condition through the test bench, replacing the engine oil to be evaluated, idling for 3-7 minutes, and discharging the oil for 10-20 minutes.
The method for evaluating the low-speed pre-ignition generation and inhibition of the gasoline engine oil preferably includes:
and adding the engine oil to be evaluated through the test bench, and operating the pre-running working condition at full load for 1-3 hours at the rotating speed of 1400-1600 r/min.
The method for evaluating the low-speed pre-ignition generation and inhibition of the gasoline engine oil as described above, wherein preferably, the blow-by gas is increased in the engine to create the condition that the engine oil enters the combustion chamber, specifically comprising:
continuously adding compressed air with the flow rate of not less than 20L/min into an engine crankcase from an engine oil level gauge guide pipe of the engine, and enabling the compressed air to enter an engine combustion chamber along with an engine breathing system and an engine running process to create a condition that engine oil enters the combustion chamber, wherein the flow rate of the engine oil entering the combustion chamber is not less than 2 g/h.
The method for evaluating the generation and inhibition of the low-speed pre-ignition of the gasoline engine oil, wherein preferably, the operating low-speed pre-ignition test working condition specifically comprises the following steps:
through the test bench, according to the selected technical index of the engine, a preset rotating speed with the rotating speed within the range of 1200r/min-1600r/min is selected, a low-speed pre-ignition test working condition is operated under a full-load working condition, and the operating time is the duration corresponding to 10 ten thousand ignition cycles.
The method for evaluating the generation and the inhibition of the low-speed pre-ignition of the gasoline engine oil preferably comprises the following steps of:
in the low-speed pre-ignition test process, the evaluation indexes of the low-speed pre-ignition generation and inhibition of the gasoline engine oil are recorded, the evaluation indexes of the low-speed pre-ignition generation and inhibition of the gasoline engine oil comprise at least one of engine power, torque and explosion pressure, and the pre-ignition times in 10 ten thousand ignition cycles are confirmed according to the evaluation standard of the explosion pressure corresponding to the pre-ignition and the super-detonation.
The invention provides a method for evaluating low-speed pre-ignition generation and inhibition of gasoline engine oil, which effectively eliminates the possibility of low-speed pre-ignition generated by carbon deposition in a combustion chamber through a carbon deposition cleaning working condition; test errors or risks caused by foreign matters in the engine oil are effectively eliminated through the engine oil flushing working condition; the condition that the engine oil induces low-speed pre-ignition is manufactured by increasing blow-by gas to an engine crankcase, realizing that a certain amount of engine oil is carried into a combustion chamber and artificially simulating the engine oil to enter the combustion chamber for combustion, so that the comparison of the low-speed pre-ignition occurrence frequencies of different engine oil is effectively realized, and further the evaluation of the low-speed pre-ignition inhibition of the gasoline engine oil is realized; therefore, the method can realize accurate evaluation of the inhibition of the precombustion of the engine oil, effectively confirm the low-speed precombustion caused by the gasoline engine oil, has better guiding significance for engineering development, can avoid invalid tests, avoid inaccurate evaluation of the engine oil with different specifications, is favorable for matching development of the engine oil in engine development, and avoids component damage caused by application of the engine oil with improper specifications to the engine.
Drawings
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described with reference to the accompanying drawings, in which:
FIG. 1 is a flow chart of an embodiment of a method for evaluating the generation and inhibition of low-speed pre-ignition of gasoline engine oil according to the present invention;
FIG. 2 is a schematic illustration of the increased blow-by gas and oil carry-over provided by the present invention.
Detailed Description
Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the disclosure, its application, or uses. The present disclosure may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that: the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values set forth in these embodiments are to be construed as merely illustrative, and not restrictive, unless specifically stated otherwise.
As used in this disclosure, "first", "second": and the like, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element preceding the word covers the element listed after the word, and does not exclude the possibility that other elements are also covered. "upper", "lower", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
In the present disclosure, when a specific component is described as being located between a first component and a second component, there may or may not be intervening components between the specific component and the first component or the second component. When it is described that a specific component is connected to other components, the specific component may be directly connected to the other components without having an intervening component, or may be directly connected to the other components without having an intervening component.
All terms (including technical or scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.
As shown in fig. 1, the method for evaluating the generation and inhibition of low-speed pre-ignition of gasoline engine oil provided by this embodiment specifically includes the following steps in an actual implementation process:
and step S1, replacing the engine oil in the engine with the engine oil to be evaluated, and assembling equipment for evaluating the generation and inhibition of the pre-ignition on the engine.
In an embodiment of the method for evaluating the generation and inhibition of low-speed pre-ignition of gasoline engine oil of the present invention, the step S1 may specifically include:
and step S11, selecting a new engine assembled by normal design standards or an old engine meeting the design standards.
The condition of meeting the design standard means that the compression ratio of the combustion chamber, the hardware state of each group of parts and the like meet the design standard.
And step S12, completing running-in of the selected new engine according to a conventional running-in specification, or confirming the performance of the selected old engine.
And step S13, replacing the oil in the selected new engine or old engine with the oil to be evaluated.
Step S14, assembling a device for evaluating the generation and inhibition of pre-ignition on the new engine or the old engine to be replaced with the engine oil to be evaluated, wherein the device for evaluating the generation and inhibition of pre-ignition comprises a combustion analyzer, a cylinder pressure sensor and a data acquisition instrument.
And step S2, operating a carbon cleaning working condition.
Specifically, the carbon cleaning conditions are run through the test rig at full speed and full load for a period of time in the range of 1 hour to 3 hours, for example 2 hours. The invention can effectively eliminate the possibility of low-speed pre-combustion caused by carbon deposition in the combustion chamber by designing the working condition of carbon deposition removal.
And step S3, operating the engine oil flushing working condition.
Specifically, the engine oil flushing condition is operated through the test bench, the engine oil to be evaluated is replaced, and the test bench is idled for 3 minutes to 7 minutes, such as 5 minutes, and drained for 10 minutes to 20 minutes, such as 15 minutes. The invention changes the engine oil to be evaluated by designing the engine oil flushing working condition, and can effectively eliminate the test error or risk caused by foreign matters in the engine oil.
And step S4, running the pre-running working condition.
Specifically, the engine oil to be evaluated is added through the test bench, and the full-load running pre-running working condition is carried out at the rotating speed of 1400r/min-1600r/min (for example, 1500r/min), wherein the running time is 1 hour-3 hours, for example 2 hours. The torque at this time is the maximum torque at a selected rotational speed (e.g., 1500 r/min).
Step S5, blow-by gas is added to the engine to create conditions for oil to enter the combustion chamber.
Designing blow-by gas adding, engine oil carrying and low-speed pre-ignition creating conditions through the step S4. specifically, continuously adding compressed air with the flow rate of not less than 20L/min to an engine crankcase from an engine oil level guide pipe, and enabling the compressed air to enter an engine combustion chamber along with an engine breathing system and an engine running process, so as to create the condition that the engine oil enters the combustion chamber, wherein the flow rate of the engine oil entering the combustion chamber is not less than 2 g/h.
Fig. 2 shows a schematic diagram of increasing blow-by gas and engine oil carrying, in which an engine oil gauge pipe, a cylinder head shield, a crankcase, and a ventilation system (PCV valve, etc.) of a gasoline engine are standard configuration components, the present invention directly uses the existing structure, utilizes a compressed air source standardized by a bench test room, and connects a hose to an engine oil gauge pipe opening of the engine, so that gas enters the crankcase to carry engine oil, and enters an air intake manifold and an engine combustion chamber together with engine combustion blow-by gas through an engine breathing system pipeline, and engine oil droplets exist in fuel oil and gas mixture, if the inhibition of the engine oil pre-ignition is not good, pre-ignition is caused, and the test is characterized by high explosion pressure.
The scheme that blow-by gas is added to the crankcase of the engine, a certain amount of engine oil is carried into the combustion chamber, and the engine oil is artificially simulated to enter the combustion chamber for combustion is designed, so that the condition that the engine oil induces low-speed pre-ignition is manufactured, the comparison of the low-speed pre-ignition occurrence frequencies of different engine oil is effectively realized, and the low-speed pre-ignition inhibition evaluation of the gasoline engine oil is further realized.
And step S6, operating a low-speed pre-ignition test working condition.
Specifically, through the test bench, according to the selected technical index of the engine, a preset rotating speed (for example, 1400r/min) with the rotating speed within the interval of 1200r/min-1600r/min is selected, the low-speed pre-ignition test working condition is operated under the full-load working condition, and the operating time is the duration corresponding to 10 ten thousand ignition cycles. The torque at this time is the maximum torque at a selected rotational speed (e.g., 1400 r/min). The technical indexes of the engine comprise rated rotating speed, maximum torque and the like.
And step S7, evaluating the low-speed pre-ignition generation and inhibition of the gasoline engine oil under the low-speed pre-ignition test working condition.
Specifically, in the low-speed pre-ignition test process, the evaluation indexes of the low-speed pre-ignition generation and inhibition of the gasoline engine oil are recorded, the evaluation indexes of the low-speed pre-ignition generation and inhibition of the gasoline engine oil comprise at least one of engine power, torque and explosion pressure, and the pre-ignition times in 10 ten thousand ignition cycles are confirmed according to the evaluation standard of the explosion pressure corresponding to the pre-ignition and the super-detonation. In specific implementation, the combustion pressure is measured by adopting a cylinder pressure sensor so as to accurately collect and evaluate the pre-ignition times.
According to the evaluation method for the low-speed pre-ignition generation and inhibition of the gasoline engine oil, the possibility of low-speed pre-ignition generated by carbon deposition in a combustion chamber is effectively eliminated through the working condition of carbon deposition removal; test errors or risks caused by foreign matters in the engine oil are effectively eliminated through the engine oil flushing working condition; by adding blow-by gas to an engine crankcase, a certain amount of engine oil is carried into a combustion chamber, and the condition that the engine oil induces low-speed pre-ignition is manufactured by artificially simulating the engine oil to enter the combustion chamber for combustion, the comparison of the low-speed pre-ignition occurrence frequencies of different engine oil is effectively realized, and further the low-speed pre-ignition inhibition evaluation of the gasoline engine oil is realized; therefore, the method can realize accurate evaluation of the inhibition of the precombustion of the engine oil, effectively confirm the low-speed precombustion caused by the gasoline engine oil, has better guiding significance for engineering development, can avoid invalid tests, avoid inaccurate evaluation of the engine oil with different specifications, is favorable for matching development of the engine oil in engine development, and avoids component damage caused by application of the engine oil with improper specifications to the engine.
Thus far, various embodiments of the present disclosure have been described in detail. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.
Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. It will be understood by those skilled in the art that various changes may be made in the above embodiments or equivalents may be substituted for elements thereof without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.
Claims (4)
1. A method for evaluating the generation and inhibition of low-speed pre-ignition of gasoline engine oil is characterized by comprising the following steps:
replacing engine oil in the engine with engine oil to be evaluated, and assembling equipment for evaluating the generation and inhibition of pre-ignition on the engine;
running the carbon cleaning working condition at full speed and full load through the test bench, wherein the running time is 1-3 hours;
running an engine oil flushing working condition through a test bench, replacing the engine oil to be evaluated, idling for 3-7 minutes, and discharging the oil for 10-20 minutes;
adding engine oil to be evaluated through a test bench, and operating the pre-running working condition at full load when the rotating speed is 1400-1600 r/min, wherein the operating time is 1-3 hours;
increasing blow-by gas in the engine to create conditions for engine oil to enter the combustion chamber;
running a low-speed pre-ignition test working condition;
under the low-speed pre-ignition test working condition, the low-speed pre-ignition generation and inhibition of the gasoline engine oil are evaluated,
the method for increasing the blow-by gas in the engine to create the condition that the engine oil enters the combustion chamber specifically comprises the following steps:
continuously adding compressed air with the flow rate of not less than 20L/min into an engine crankcase from an engine oil gauge guide pipe of the engine, and enabling the compressed air to enter an engine combustion chamber along with an engine breathing system and the operation process of the engine to create the condition that engine oil enters the combustion chamber, wherein the flow rate of the engine oil entering the combustion chamber is not less than 2 g/h.
2. The method for evaluating the generation and inhibition of the low-speed pre-ignition of the gasoline engine oil according to claim 1, wherein the engine oil in the engine is replaced by the engine oil to be evaluated, and equipment for evaluating the generation and inhibition of the pre-ignition is assembled on the engine, and the method specifically comprises the following steps:
selecting a new engine assembled according to a normal design standard or an old engine meeting the design standard;
completing running-in of the selected new engine according to a conventional running-in specification, or confirming the performance of the selected old engine;
replacing the engine oil in the selected new engine or old engine with the engine oil to be evaluated;
an apparatus for evaluating the generation and inhibition of pre-ignition, which includes a combustion analyzer, a cylinder pressure sensor, and a data collector, is assembled on a new engine or an old engine to be replaced with engine oil to be evaluated.
3. The method for evaluating the generation and the inhibition of the low-speed pre-ignition of the gasoline engine oil according to claim 1, wherein the running low-speed pre-ignition test condition specifically comprises:
through the test bench, according to the selected technical index of the engine, a preset rotating speed with the rotating speed within the range of 1200r/min-1600r/min is selected, the low-speed pre-ignition test working condition is operated under the full-load working condition, and the operating time is the time length corresponding to 10 ten thousand ignition cycles.
4. The method for evaluating the generation and the inhibition of the low-speed pre-ignition of the gasoline engine oil according to claim 3, wherein the evaluating the generation and the inhibition of the low-speed pre-ignition of the gasoline engine oil under the low-speed pre-ignition test condition specifically comprises the following steps:
in the low-speed pre-ignition test process, the evaluation indexes of the low-speed pre-ignition generation and inhibition of the gasoline engine oil are recorded, the evaluation indexes of the low-speed pre-ignition generation and inhibition of the gasoline engine oil comprise at least one of engine power, torque and explosion pressure, and the pre-ignition times in 10 ten thousand ignition cycles are confirmed according to the evaluation standard of the explosion pressure corresponding to the pre-ignition and the super-detonation.
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| CN107001978A (en) * | 2014-12-02 | 2017-08-01 | 国际壳牌研究有限公司 | The method for reducing low speed early combustion |
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