Engine oil change period equivalent evaluation method based on engine reliability test

Abstract

The invention discloses an engine oil change period equivalent evaluation method based on an engine reliability test, and the method comprises the steps: collecting a whole vehicle driving working condition road spectrum, and recording working condition road spectrum parameters; performing an engine reliability test within the reliability test time T, recording reliability test parameters, and regularly selecting engine oil samples for inspecting various engine oil indexes in the process; according to the working condition road spectrum parameters and the reliability test parameters, calculating an equivalent whole vehicle driving mileage E within the engine pedestal reliability test time T; according to the engine oil change standard indexes, performing curve fitting on engine oil indexes of an engine oil sample in the reliability test process, and establishing a linear regression equation as an engine oil performance degradation model; and calculating the equivalent mileage F of the oil change period according to an engine oil performance degradation model. According to the method, the engine pedestal reliability test hours are equivalently calculated into the actual running mileage under the use of the whole vehicle, so that the oil change period of the engine oil can be more accurately evaluated, and the scientificity of engine oil change decision is improved.

Description

Technical Field

[0001] The invention relates to the technical field of engines, and in particular to an equivalent evaluation method for an oil change cycle based on an engine reliability test. Background Art

[0002] During the operation of the engine, lubricating oil (engine oil) plays a vital role, and its performance directly affects the operating reliability and life of the engine. The traditional oil change cycle method mainly determines the usable mileage of the engine oil based on vehicle road tests and experience. This method often ignores the actual operating conditions of the engine and the performance changes of the engine oil under different conditions. Although the engine bench test can simulate a variety of operating conditions, how to effectively convert the bench test data into the oil change cycle evaluation under the actual vehicle use conditions is still a major challenge. Therefore, the development of an accurate oil change cycle evaluation method is of great significance to improving the operating reliability and life of the engine and reducing maintenance costs.

[0003] The information disclosed in the above background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as admitting or suggesting in any form that the information constitutes the prior art already known to ordinary technicians in this field. Summary of the invention

[0004] In view of the above-mentioned existing defects, the purpose of the present invention is to provide an oil change cycle evaluation method based on engine reliability test, by calculating the engine reliability test time equivalent to the actual mileage of the vehicle, combined with the changes in oil performance, to comprehensively evaluate its oil change cycle.

[0005] The technical solution of the present invention is as follows:

[0006] An oil change cycle equivalence evaluation method based on engine reliability test, comprising:

[0007] S1: Collect the vehicle driving condition road spectrum and record the driving condition road spectrum parameters;

[0008] S2: Conduct the engine reliability test within the reliability test time T and record the reliability test parameters. During the process, regularly select engine oil samples for inspection of various engine oil indicators;

[0009] S3: Calculate the equivalent vehicle mileage E within the engine bench reliability test time T according to the operating road spectrum parameters and reliability test parameters;

[0010] S4: According to the oil change standard index, the oil index of the oil sample during the reliability test is fitted with a curve, and a linear regression equation is established as the oil performance degradation model;

[0011] S5: Calculate the oil change cycle equivalent mileage F based on the engine oil performance degradation model.

[0012] Specifically, the operating condition road spectrum parameters in S1 include: the fuel consumption per 100 kilometers of the vehicle A1, the hourly fuel consumption of the road spectrum operating condition A2, the average speed of the road spectrum operating condition A3, and the average oil temperature of the road spectrum operating condition A4.

[0013] Specifically, the reliability test parameters in S2 include: the reliability test average speed B1 within the engine reliability time T, and the reliability test average oil temperature B2.

[0014] Specifically, in S3, the equivalent vehicle mileage E within the engine bench reliability test time T is calculated according to the operating road spectrum parameters and the reliability test parameters, which specifically includes:

[0015] S301: Calculate the average vehicle speed C1, which is calculated from the hourly fuel consumption A2 of the road spectrum and the fuel consumption per 100 kilometers A1, that is, C1 = A2 / (A1 / 100*ρ), where ρ is the density of diesel;

[0016] S302: Calculate the speed enhancement factor D1, which is the ratio of the average speed B1 of the reliability test to the average speed A3 of the road spectrum condition, that is, D1 = B1 / A3;

[0017] S303: Calculate the temperature enhancement factor D2 by comparing the average oil temperature B2 of the reliability test and the average oil temperature A4 of the road spectrum condition, that is, D2 = B2 / A4;

[0018] S304: Calculate the equivalent mileage E of the engine reliability test, which is the product of the reliability test time T and the speed enhancement factor D1, the temperature enhancement factor D2, and the average vehicle speed C1: E=T*C1*D1*D2.

[0019] Specifically, in S5, the oil change cycle equivalent mileage F is calculated according to the oil performance degradation model, which is:

[0020] S501: Estimate the oil change time T2 required to reach the oil change index according to the linear regression equation in the model;

[0021] S502: The ratio of the oil change time T2 to the engine bench reliability test time T is used as the potential factor D3, that is, D3 = T2 / T;

[0022] S503: Calculate the oil change cycle equivalent mileage F according to the product of the engine reliability test equivalent mileage E and the potential factor D3, that is, F=E*D3.

[0023] Specifically, the engine oil indicators tested in S2 include: kinematic viscosity, pH value, and content of metal elements such as iron.

[0024] Specifically, in S5, the time when the upper limit of the oil change index is reached first according to the various oil indexes is used as the oil change time T2.

[0025] Beneficial effects of the present invention:

[0026] The present invention can more accurately evaluate the oil change cycle of the engine oil by calculating the equivalent of the engine bench reliability test hours to the actual running mileage of the whole vehicle, improve the scientific nature of the oil change decision, avoid premature or delayed replacement, reduce maintenance costs, and improve the reliability and service life of the engine. At the same time, the method of the present invention is simple and easy to implement, does not require additional test equipment and costs, and has high practicality and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The present invention is a flow chart of an oil change cycle equivalent evaluation method based on an engine reliability test.

[0028] Figure 2 Detailed flowchart of step S3 of the present invention.

[0029] Figure 3 Detailed flowchart of step S5 of the present invention.

[0030] Figure 4 It is a fitting curve diagram of the kinematic viscosity change rate index of the present invention.

[0031] Figure 5 It is a fitting curve diagram of the pH value index of the present invention.

[0032] Figure 6 It is the fitting curve diagram of the iron content index of the present invention. DETAILED DESCRIPTION

[0033] In order to explain the technical content, purpose and effect of the present invention in detail, the following is an explanation in combination with embodiments and accompanying drawings. In the description of the embodiments, it should be understood that the terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present embodiment and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0034] Example 1

[0035] like Figure 1As shown, according to the specific implementation of this scheme, an equivalent evaluation method for oil change cycle based on engine reliability test can be applied to determine the oil change cycle in various market scenarios. It mainly collects the engine speed and oil temperature data under various scenarios, calculates the average speed and average oil temperature by weight, compares the average speed and average oil temperature of the engine reliability test, calculates the speed enhancement factor and the oil temperature enhancement factor, and then calculates the oil change cycle in the corresponding scenario.

[0036] The specific steps include:

[0037] S1: Collect the vehicle driving condition road spectrum and record the driving condition road spectrum parameters.

[0038] In this embodiment, the collected vehicle driving condition road spectrum mainly includes the vehicle's driving speed and fuel consumption. Then, by analyzing the vehicle's road spectrum data, A1: fuel consumption per 100 kilometers L / 100km, A2: road spectrum condition hourly fuel consumption kg / h, A3: road spectrum condition average speed r / min, A4: road spectrum condition average oil temperature ℃ are calculated.

[0039] S2: Conduct the engine reliability test within the reliability test time T and record the reliability test parameters. During the process, regularly select engine oil samples for inspection of various engine oil indicators.

[0040] This step mainly includes two procedures:

[0041] The first procedure is to conduct engine reliability tests by designing an engine bench to verify the duration and operating conditions of the reliability test. During the process, oil samples are taken regularly for inspection of various oil indicators. The corresponding reliability time for each sampling is recorded as t1, t2, t3...tn, and the final cumulative reliability time is recorded as T, tn≤T; the oil sample testing items mainly include kinematic viscosity, pH value, and the content of metal elements such as iron.

[0042] The second procedure is to calculate B1: the average speed r / min within the engine reliability time T, B2: the average oil temperature ℃ of the reliability test.

[0043] S3: Calculate the equivalent vehicle mileage E within the engine bench reliability test time T based on the operating road spectrum parameters and reliability test parameters.

[0044] In this embodiment, specifically, Figure 2 As shown, the calculation method of equivalent vehicle mileage E is as follows:

[0045] S301: Calculate the average vehicle speed C1, which is calculated from the hourly fuel consumption A2 of the road spectrum and the fuel consumption per 100 kilometers A1, that is, C1 = A2 / (A1 / 100*ρ), where ρ is the density of diesel;

[0046] S302: Calculate the speed enhancement factor D1, which is the ratio of the average speed B1 of the reliability test to the average speed A3 of the road spectrum condition, that is, D1 = B1 / A3;

[0047] S303: Calculate the temperature enhancement factor D2 by comparing the average oil temperature B2 of the reliability test and the average oil temperature A4 of the road spectrum condition, that is, D2 = B2 / A4;

[0048] S304: Calculate the equivalent mileage E of the engine reliability test, which is the product of the reliability test time T and the speed enhancement factor D1, the temperature enhancement factor D2, and the average vehicle speed C1: E=T*C1*D1*D2.

[0049] S4: According to the oil change standard index, a fitting curve is performed on the oil index of the oil sample during the reliability test, and a linear regression equation is established as the oil performance degradation model.

[0050] According to the various indicators of the engine oil, the engine oil indicator data is fitted, a trend line is drawn, and the reliability time T2 required to reach the oil change indicator is calculated and predicted as the reliability test end point. The oil change indicator in this embodiment is in accordance with "GB / T 7607-2010 Diesel Engine Oil Oil Change Indicator", and the test results of various indicators of the engine oil sampled during the reliability process, such as the kinematic viscosity change rate, base value decrease, acid value increase, iron element, etc., are fitted with a curve, see Figure 4 , Figure 5 , Figure 6 , and establish the oil performance degradation model respectively.

[0051] S5: Calculate the oil change cycle equivalent mileage F based on the engine oil performance degradation model.

[0052] S501: Analyze the trend of the rising elements, wherein the time when each index first reaches the upper limit of the oil change index is used as the oil change time T2;

[0053] S502: The ratio of the oil change time T2 to the current engine bench reliability test time T is used as the potential factor D3, that is, D3 = T2 / T;

[0054] S503: Calculate the equivalent oil change period in combination with the engine oil index. The product of the engine reliability test equivalent mileage and the potential factor is used as the oil change period equivalent mileage km, and the oil change period equivalent mileage F, that is, F=E*D3.

[0055] This solution can more accurately evaluate the oil change cycle of the engine oil by calculating the equivalent of the engine bench reliability test hours to the actual running mileage of the whole vehicle, improve the scientific nature of the oil change decision, avoid premature or delayed replacement, reduce maintenance costs, and improve the reliability and service life of the engine. At the same time, the method of the present invention is simple and easy to implement, does not require additional test equipment and costs, and has high practicality and promotion value.

[0056] Although the present invention has been described in detail above with specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A method for evaluating the equivalent oil change cycle based on engine reliability test, characterized in that: include: S1: Collect the vehicle driving condition road spectrum and record the driving condition road spectrum parameters; S2: Conduct the engine reliability test within the reliability test time T and record the reliability test parameters. During the process, regularly select engine oil samples for inspection of various engine oil indicators; S3: Calculate the equivalent vehicle mileage E within the engine bench reliability test time T according to the operating road spectrum parameters and reliability test parameters; S4: According to the oil change standard index, the oil index of the oil sample during the reliability test is fitted with a curve, and a linear regression equation is established as the oil performance degradation model; S5: Calculate the oil change cycle equivalent mileage F based on the engine oil performance degradation model.

2. The method for evaluating the oil change cycle equivalence based on the engine reliability test according to claim 1, characterized in that: The operating road spectrum parameters in S1 include: the vehicle's fuel consumption per 100 kilometers A1, the hourly fuel consumption under the road spectrum operating conditions A2, the average speed under the road spectrum operating conditions A3, and the average oil temperature under the road spectrum operating conditions A4.

3. The method for evaluating the oil change cycle equivalence based on the engine reliability test according to claim 2, characterized in that: The reliability test parameters in S2 include: the reliability test average speed B1 within the engine reliability time T, and the reliability test average oil temperature B2.

4. The method for evaluating the oil change cycle equivalence based on the engine reliability test according to claim 3, characterized in that: In S3, the equivalent vehicle mileage E within the engine bench reliability test time T is calculated according to the operating road spectrum parameters and the reliability test parameters, which specifically includes: S301: Calculate the average vehicle speed C1, which is calculated from the hourly fuel consumption A2 of the road spectrum and the fuel consumption per 100 kilometers A1, that is, C1 = A2 / (A1 / 100*ρ), where ρ is the density of diesel; S302: Calculate the speed enhancement factor D1, which is the ratio of the average speed B1 of the reliability test to the average speed A3 of the road spectrum condition, that is, D1 = B1 / A3; S303: Calculate the temperature enhancement factor D2 by comparing the average oil temperature B2 of the reliability test and the average oil temperature A4 of the road spectrum condition, that is, D2 = B2 / A4; S304: Calculate the equivalent mileage E of the engine reliability test, which is the product of the reliability test time T and the speed enhancement factor D1, the temperature enhancement factor D2, and the average vehicle speed C1: E=T*C1*D1*D2.

5. The method for evaluating the oil change cycle equivalence based on the engine reliability test according to claim 1, characterized in that: In S5, the equivalent mileage F of the oil change cycle is calculated based on the oil performance degradation model, which is specifically: S501: Estimate the oil change time T2 required to reach the oil change index according to the linear regression equation in the model; S502: The ratio of the oil change time T2 to the engine bench reliability test time T is used as the potential factor D3, that is, D3 = T2 / T; S503: Calculate the oil change cycle equivalent mileage F according to the product of the engine reliability test equivalent mileage E and the potential factor D3, that is, F=E*D3.

6. The method for evaluating the oil change cycle equivalence based on the engine reliability test according to claim 5, characterized in that: The engine oil indicators tested in S2 include: kinematic viscosity, pH value, and content of metal elements such as iron.

7. The method for evaluating the oil change cycle equivalence based on the engine reliability test according to claim 6, characterized in that: In S5, the time when the upper limit of the oil change index is reached first according to the various oil indexes detected is used as the oil change time T2.

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