CN110907626B - Method for evaluating quality of engine oil - Google Patents
Method for evaluating quality of engine oil Download PDFInfo
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- CN110907626B CN110907626B CN202010095238.2A CN202010095238A CN110907626B CN 110907626 B CN110907626 B CN 110907626B CN 202010095238 A CN202010095238 A CN 202010095238A CN 110907626 B CN110907626 B CN 110907626B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/26—Oils; viscous liquids; paints; inks
- G01N33/28—Oils, i.e. hydrocarbon liquids
- G01N33/2888—Lubricating oil characteristics, e.g. deterioration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
Abstract
The invention relates to an evaluation method of the quality of engine oil, which comprises the following steps: acquiring a differential pressure value of a DPF installed in an engine exhaust system in real time; calculating a differential pressure change rate according to the differential pressure value; comparing the differential pressure change rate with a preset differential pressure change rate threshold value; and judging that the quality of the engine oil is poor according to the result that the differential pressure change rate is greater than the preset differential pressure change rate threshold value. In a DPF system, DPF ash accumulation is mainly from engine oil, and engine oil quality can be evaluated by utilizing ash accumulation in the DPF, which can be further reflected by the pressure difference change rate of the DPF. According to the embodiment of the invention, the pressure difference of the DPF is obtained in real time to calculate the pressure difference change rate, the pressure difference change rate is compared with the preset pressure difference change rate threshold, and if the pressure difference change rate is larger than the preset pressure difference change rate threshold, the engine oil quality is poor.
Description
Technical Field
The invention belongs to the technical field of engines, and particularly relates to an evaluation method for the quality of engine oil of an engine.
Background
The quality of the engine oil affects the lubrication performance of the engine, the oil consumption of the engine, and the service life of the engine. For example, poor quality oil can lead to poor engine lubrication and cooling, carbon deposits can occur which can lead to engine damage, and poor quality oil can even cause clogging and poisoning of after-treatment. Therefore, acceptable quality engine oil is critical to the engine. However, there is no effective method for directly detecting the quality of engine oil in the engine.
Disclosure of Invention
The invention aims to at least solve the problem that the prior art cannot directly detect the quality of engine oil of an engine. The purpose is realized by the following technical scheme:
the embodiment of the invention provides an evaluation method of the quality of engine oil, which comprises the following steps:
acquiring a differential pressure value of a DPF installed in an engine exhaust system in real time;
calculating a differential pressure change rate according to the differential pressure value;
comparing the differential pressure change rate with a preset differential pressure change rate threshold value;
and judging that the quality of the engine oil is poor according to the result that the differential pressure change rate is greater than the preset differential pressure change rate threshold value.
Since in a DPF system, DPF ash accumulation is mainly from engine oil, different quality engine oil will use different additives, and the ratio of engine oil additive to ash is about 80%, the engine oil quality can be evaluated by using the ash accumulation in the DPF, which can be further reflected by the pressure difference change rate of the DPF. According to the embodiment of the invention, the pressure difference of the DPF is obtained in real time to calculate the pressure difference change rate, the pressure difference change rate is compared with the preset pressure difference change rate threshold, if the pressure difference change rate is smaller than or equal to the preset pressure difference change rate threshold, the engine oil quality can meet the use requirement, otherwise, if the pressure difference change rate is larger than the preset pressure difference change rate threshold, the engine oil quality is poor.
In some embodiments of the present invention, before the step of obtaining the differential pressure value of the DPF installed in the engine exhaust system in real time, the method further comprises:
and issuing a primary regeneration command to the DPF to perform primary regeneration on the DPF.
In some embodiments of the present invention, after the step of issuing a regeneration command to the DPF to perform a regeneration of the DPF, the method further comprises:
acquiring the temperature of the DPF in real time, and calculating the temperature change rate according to the temperature;
and under the condition that the temperature change rate is less than or equal to a preset temperature change rate threshold value, executing the step of acquiring the differential pressure value of the DPF installed in the engine exhaust system in real time.
In some embodiments of the present invention, after the step of issuing a regeneration command to the DPF to perform a regeneration of the DPF, the method further comprises:
acquiring the volume flow of the DPF in real time, and calculating the volume flow change rate according to the volume flow;
the step of acquiring in real time a differential pressure value of a DPF installed in an engine exhaust system is performed in a case where the volume flow rate change rate is equal to or less than a preset volume flow rate change rate threshold value.
In some embodiments of the present invention, after the step of issuing a regeneration command to the DPF to perform a regeneration of the DPF, the method further comprises:
acquiring the carbon loading of the DPF in real time;
the step of acquiring a differential pressure value of the DPF installed in the engine exhaust system in real time is performed in a case where the carbon loading is equal to or less than a preset carbon loading.
In some embodiments of the present invention, after the step of issuing a regeneration command to the DPF to perform a regeneration of the DPF, the method further comprises:
acquiring the rotating speed and the load of an engine in real time;
and under the condition that the rotating speed is greater than or equal to a first preset rotating speed and less than or equal to a second preset rotating speed, and the load is greater than or equal to a first preset load and less than or equal to a second preset load, executing the step of acquiring the differential pressure value of the DPF installed in the engine exhaust system in real time.
In some embodiments of the present invention, before the step of commanding a regeneration of the DPF to perform a regeneration of the DPF, the method further comprises:
after confirming that the new engine oil is replaced, starting timing to record the time length from the time when the new engine oil is replaced to the current time;
and executing the step of issuing a primary regeneration instruction to the DPF according to the result that the time length is more than or equal to the preset time length so as to perform primary regeneration on the DPF.
In some embodiments of the invention, the method of evaluating further comprises:
and recording the time length from the time of the engine oil replacement to the current time by using a delay timer.
In some embodiments of the invention, the method of evaluating further comprises:
counting the frequency of the result that the differential pressure change rate is greater than the preset differential pressure change rate threshold value;
and sending an alarm for prompting the abnormal quality of the engine oil according to the result that the frequency reaches the preset frequency.
In some embodiments of the invention, the method of evaluating further comprises:
and acquiring a pressure difference value of the DPF by using a pressure difference sensor.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like parts are designated by like reference numerals throughout the drawings. In the drawings:
fig. 1 is a schematic flow chart of a method for evaluating the quality of engine oil according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, 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 is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" can include both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
As shown in fig. 1, the present invention provides an evaluation method of quality of engine oil, the evaluation method comprising:
s110: acquiring a differential pressure value of a DPF (Particulate Filter) installed in an engine exhaust system in real time;
s120: calculating a differential pressure change rate according to the differential pressure value;
s130: comparing the differential pressure change rate with a preset differential pressure change rate threshold value;
s140: and judging that the quality of the engine oil is poor according to the result that the differential pressure change rate is greater than the preset differential pressure change rate threshold value.
In the DPF system, the ash accumulation of the DPF is mainly from engine oil, the engine oil with different qualities can use different additives, the proportion of the converted engine oil additive to the ash is about 80%, therefore, the engine oil quality can be evaluated by utilizing the ash accumulation in the DPF, and the ash accumulation can be further reflected by the pressure difference change rate of the DPF.
Further, before the step of acquiring a differential pressure value of the DPF installed in an engine exhaust system in real time, the method further includes:
and issuing a primary regeneration command to the DPF to perform primary regeneration on the DPF.
The DPF is mainly used for capturing particulate matters in engine exhaust so as to reduce the dust amount discharged to the atmosphere, the particulate matters in the DPF are mainly divided into two parts, namely combustible matter root and non-combustible matter ash, wherein the root can be combusted through active regeneration or passive regeneration of the DPF, and the ash is required to be accumulated to a certain amount and then is sent to a service station for ash removal. In this embodiment, before the step of acquiring the differential pressure value of the DPF installed in the engine exhaust system in real time, a regeneration instruction is issued to the DPF to perform a regeneration of the DPF, so that the soot inside the DPF can be removed, thereby eliminating the influence of the dry soot on the differential pressure of the DPF.
Further, after the step of issuing a regeneration command to the DPF for performing a regeneration of the DPF once, it is preferable to ensure that a certain condition is satisfied, and then the step of acquiring a differential pressure value of the DPF installed in an engine exhaust system in real time is performed, whereby a certain disturbance can be eliminated, thereby improving the accuracy of the evaluation method. The above conditions include the temperature of the DPF, the volume flow rate of the DPF, the carbon loading of the DPF, the rotation speed and load of the engine, and the like. Each of which is further described below.
In a specific embodiment, after the step of issuing a regeneration command to the DPF, the method further includes:
acquiring the temperature of the DPF in real time, and calculating the temperature change rate according to the temperature;
and under the condition that the temperature change rate is less than or equal to a preset temperature change rate threshold value, executing the step of acquiring the differential pressure value of the DPF installed in the engine exhaust system in real time.
In the present embodiment, it is ensured that the step of acquiring the differential pressure value of the DPF installed in the engine exhaust system in real time is performed in a case where the temperature change rate of the DPF is less than the preset temperature change rate threshold, mainly to avoid a situation where the differential pressure value cannot accurately reflect the ash content due to the non-uniform temperature inside the DPF.
In a specific embodiment, after the step of issuing a regeneration command to the DPF, the method further includes:
acquiring the volume flow of the DPF in real time, and calculating the volume flow change rate according to the volume flow;
the step of acquiring in real time a differential pressure value of a DPF installed in an engine exhaust system is performed in a case where the volume flow rate change rate is equal to or less than a preset volume flow rate change rate threshold value.
In the embodiment, the step of acquiring the differential pressure value of the DPF installed in the engine exhaust system in real time is performed under the condition that the volume flow rate change rate of the DPF is smaller than the preset volume flow rate change rate threshold value, so that the problem that the differential pressure measurement is inaccurate due to the overlarge volume flow rate change of the DPF can be avoided.
In a specific embodiment, after the step of issuing a regeneration command to the DPF, the method further includes:
acquiring the carbon loading of the DPF in real time;
the step of acquiring a differential pressure value of the DPF installed in the engine exhaust system in real time is performed in a case where the carbon loading is equal to or less than a preset carbon loading.
In the present embodiment, it is ensured that the step of acquiring the differential pressure value of the DPF installed in the engine exhaust system in real time is performed in the case where the carbon loading is equal to or less than the preset carbon loading, whereby the carbon loading calculated based on the differential pressure value can be stabilized, thereby improving the evaluation accuracy of the evaluation method.
In a specific embodiment, after the step of issuing a regeneration command to the DPF, the method further includes:
acquiring the rotating speed and the load of an engine in real time;
and under the condition that the rotating speed is greater than or equal to a first preset rotating speed and less than or equal to a second preset rotating speed, and the load is greater than or equal to a first preset load and less than or equal to a second preset load, executing the step of acquiring the differential pressure value of the DPF installed in the engine exhaust system in real time.
In the embodiment, the step of acquiring the differential pressure value of the DPF installed in the engine exhaust system in real time is performed under the condition that the rotating speed of the engine is greater than or equal to a first preset rotating speed and less than or equal to a second preset rotating speed and the load is greater than or equal to a first preset load and less than or equal to a second preset load, so that the operating condition of the engine is ensured to be within a certain range, and the effectiveness and the accuracy of the evaluation method are ensured.
Further, before the step of issuing a regeneration command to the DPF to perform a regeneration of the DPF, the method further includes:
after confirming that the new engine oil is replaced, starting timing to record the time length from the time when the new engine oil is replaced to the current time;
and executing the step of issuing a primary regeneration instruction to the DPF according to the result that the time length is more than or equal to the preset time length so as to perform primary regeneration on the DPF.
Generally, after the engine oil is replaced with new one, the quality of the engine oil needs to be evaluated. Preferably, after the engine oil is replaced with new engine oil, the step of issuing a regeneration command to the DPF to regenerate the DPF once is performed after a delay of a certain time. That is, the relevant steps for evaluating the quality of the engine oil are started after the new engine oil has sufficiently lubricated the engine.
Further, the evaluation method further comprises:
and recording the time length from the time of the engine oil replacement to the current time by using a delay timer.
That is, the duration of the delay may be determined by a delay timer to ensure that sufficient soak time is given to the new oil. In addition, related steps can be started in a timing mode through the delay timer, and therefore execution efficiency of the evaluation method is improved.
Further, the evaluation method further comprises:
counting the frequency of the result that the differential pressure change rate is greater than the preset differential pressure change rate threshold value;
and sending an alarm for prompting the abnormal quality of the engine oil according to the result that the frequency reaches the preset frequency.
In this embodiment, the frequency of the result that the differential pressure change rate is greater than the preset differential pressure change rate threshold is counted, and an alarm for prompting the quality abnormality of the engine oil is sent according to the result that the frequency reaches the preset frequency, so as to remind a user of replacing the engine oil. The effect of preventing misjudgment can be achieved by setting the preset times.
Further, the evaluation method further comprises:
and acquiring a pressure difference value of the DPF by using a pressure difference sensor.
In the embodiment, the pressure difference value of the DPF is obtained through the pressure difference sensor, so that the measurement precision of the pressure difference with high value can be ensured, and the evaluation accuracy of the evaluation method is further improved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (7)
1. A method for evaluating the quality of engine oil, comprising:
acquiring a differential pressure value of a DPF installed in an engine exhaust system in real time;
calculating a differential pressure change rate according to the differential pressure value;
comparing the differential pressure change rate with a preset differential pressure change rate threshold value;
judging that the quality of the engine oil is poor according to the result that the differential pressure change rate is greater than the preset differential pressure change rate threshold value;
before the step of acquiring a differential pressure value of the DPF installed in an engine exhaust system in real time, further comprising:
issuing a primary regeneration command to the DPF to perform primary regeneration on the DPF;
after the step of issuing a regeneration command to the DPF to perform a regeneration of the DPF, the method further includes:
acquiring the volume flow of the DPF in real time, and calculating the volume flow change rate according to the volume flow;
executing the step of acquiring a differential pressure value of a DPF installed in an engine exhaust system in real time, in a case where the volume flow rate change is equal to or less than a preset volume flow rate change threshold;
the evaluation method further comprises:
counting the frequency of the result that the differential pressure change rate is greater than the preset differential pressure change rate threshold value;
and sending an alarm for prompting the abnormal quality of the engine oil according to the result that the frequency reaches the preset frequency.
2. The method of evaluating the quality of engine oil according to claim 1, further comprising, after said step of issuing a regeneration command to said DPF to regenerate said DPF, the step of:
acquiring the temperature of the DPF in real time, and calculating the temperature change rate according to the temperature;
and under the condition that the temperature change rate is less than or equal to a preset temperature change rate threshold value, executing the step of acquiring the differential pressure value of the DPF installed in the engine exhaust system in real time.
3. The method of evaluating the quality of engine oil according to claim 1, further comprising, after said step of issuing a regeneration command to said DPF to regenerate said DPF, the step of:
acquiring the carbon loading of the DPF in real time;
the step of acquiring a differential pressure value of the DPF installed in the engine exhaust system in real time is performed in a case where the carbon loading is equal to or less than a preset carbon loading.
4. The method of evaluating the quality of engine oil according to claim 1, further comprising, after said step of issuing a regeneration command to said DPF to regenerate said DPF, the step of:
acquiring the rotating speed and the load of an engine in real time;
and under the condition that the rotating speed is greater than or equal to a first preset rotating speed and less than or equal to a second preset rotating speed, and the load is greater than or equal to a first preset load and less than or equal to a second preset load, executing the step of acquiring the differential pressure value of the DPF installed in the engine exhaust system in real time.
5. The method of evaluating the quality of engine oil according to claim 1, further comprising, before said step of issuing a regeneration command to said DPF to regenerate said DPF, the step of:
after confirming that the new engine oil is replaced, starting timing to record the time length from the time when the new engine oil is replaced to the current time;
and executing the step of issuing a primary regeneration instruction to the DPF according to the result that the time length is more than or equal to the preset time length so as to perform primary regeneration on the DPF.
6. The method of evaluating the quality of an engine oil according to claim 5, characterized by further comprising:
and recording the time length from the time of the engine oil replacement to the current time by using a delay timer.
7. The evaluation method of the quality of the engine oil according to any one of claims 1 to 6, characterized in that the evaluation method further comprises:
and acquiring a pressure difference value of the DPF by using a pressure difference sensor.
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| US11499454B2 (en) * | 2020-02-14 | 2022-11-15 | Cummins Inc. | Systems and methods for reliably detecting wear metal particles in lubrication systems to avoid progressive damage |
| CN111636952B (en) * | 2020-06-02 | 2021-09-28 | 潍柴动力股份有限公司 | Ash removal control device and method for vehicle |
| CN112145291B (en) * | 2020-09-08 | 2021-08-20 | 潍柴重机股份有限公司 | Filter element maintenance prompting method based on front-back pressure difference trend of filter |
| CN112360601B (en) * | 2020-11-13 | 2022-01-25 | 潍柴动力股份有限公司 | Engine and PN emission control system and PN emission control method thereof |
| CN113776998B (en) * | 2021-09-08 | 2022-06-24 | 安徽江淮汽车集团股份有限公司 | Supercharger deposit evaluation method |
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| CN107605574A (en) * | 2017-09-21 | 2018-01-19 | 中国汽车技术研究中心 | The on-line automatic warning system of grain catcher failure and control method |
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| CN110657009B (en) * | 2019-12-02 | 2020-03-20 | 潍柴动力股份有限公司 | Method and device for generating ash removal processing request of particle catcher |
| CN110725738B (en) * | 2019-12-17 | 2020-03-17 | 潍柴动力股份有限公司 | Method and device for detecting filtering capacity of DPF |
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| WO2008050014A1 (en) * | 2006-10-27 | 2008-05-02 | Renault S.A.S | Method of evaluating the anti-wear properties of a lubricant using a four-ball machine |
| EP2535708A1 (en) * | 2011-06-14 | 2012-12-19 | Fiat Powertrain Technologies S.p.A. | Method for detecting the quality of the engine oil in a diesel engine and corresponding detection system |
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