Maintenance warning method and system for engine oil filter and motor vehicle

Abstract

The present application relates to a method and system for maintenance warning of an engine oil filter, and a motor vehicle, comprising the following steps: obtaining data of engine speed n and oil filter differential pressure Pd according to a set engine working period, obtaining a function relationship curve between differential pressure Pd and speed n by fitting, denoted as Pd-n curve; obtaining the oil filter differential pressure Pd at a set speed according to the Pd-n curve, the obtained Pd-n curve is corrected to obtain an exponential function relationship between the oil filter differential pressure Pd and the service time t under the same oil flow and uniform speed blockage; the maximum differential pressure Pd allowed for use of the oil filter is obtained max The obtained exponential function relationship is substituted to obtain the predicted maximum service time of the oil filter, and the remaining available time of the oil filter is obtained according to the current service time of the oil filter, the remaining available time of the oil filter is predicted at the highest speed of the engine, and the remaining available time of the oil filter is predicted at the set speed of the engine, and a reminder is sent to the user.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of engine maintenance, in particular to a maintenance warning method and system for an engine oil filter and a motor vehicle. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute the prior art.

[0003] The oil filter is installed in the oil circuit of the engine and is a component for removing impurities such as dust, metal particles, carbon deposits, and soot particles in the oil, thereby protecting the engine and prolonging its service life.

[0004] In order to ensure that the quality of the oil is maintained at a certain level, the oil filter needs to be maintained. The common maintenance method is to replace the filter element. Generally, regular replacement or differential pressure alarm replacement is adopted. Regular replacement is to set a time period, and the filter element of the oil filter is replaced after each time period to ensure that the oil filter has a relatively good oil passing capacity. Differential pressure alarm replacement is to use the pressure difference before and after the oil filter in the oil circuit. When the pressure difference exceeds a certain value, it indicates that the filter element of the oil filter is beginning to be blocked, thereby affecting the passing of the oil.

[0005] The regular replacement or differential pressure alarm replacement method may cause the filter element to be replaced prematurely and wasted when the engine is used lightly, and may cause the filter element to be replaced not in time and affect the oil quality when the engine is used heavily.

[0006] At the same time, the differential pressure of the oil filter is different when the engine works at different speeds, which may cause normal differential pressure at low speed and differential pressure alarm at high speed. The regular replacement or differential pressure alarm replacement method may affect the user's judgment of whether the filter element should be replaced. SUMMARY

[0007] To solve the technical problems in the background art, the present application provides a maintenance warning method and system for an engine oil filter and a motor vehicle. The differential pressure Pb of the oil filter under a set working condition and the corresponding engine speed n are used to fit a Pb-n curve reflecting the relationship between the two, and the Pb-n curve is converted into a Pd-t curve of the differential pressure Pb of the oil filter and the use time t under the corresponding working condition by using a set speed. The maximum differential pressure Pd allowed for use of the oil filter is brought into the Pd-t curve to obtain the predicted remaining available time of the oil filter at the highest speed of the engine and the predicted remaining available time at the set speed of the engine. max

[0008] To achieve the above purpose, the present application adopts the following technical solutions:​

[0009] The first aspect of the present application provides a method for maintenance warning of engine oil filter, comprising the following steps:

[0010] According to the set engine working period, the data of engine speed n and oil filter differential pressure Pd are obtained, and the function relationship curve between the differential pressure Pd and the speed n is obtained by fitting, which is denoted as Pd-n curve;

[0011] The obtained Pd-n curve is corrected to obtain the exponential function relationship between the differential pressure Pd of the oil filter blocked at a uniform speed and the use time t under the same oil flow, which is denoted as Pd-t curve;

[0012] The maximum differential pressure Pd allowed for use of the oil filter is substituted into the obtained exponential function relationship to obtain the predicted maximum use time of the oil filter, and according to the current use time of the oil filter, the predicted remaining available time of the oil filter at the highest speed of the engine and the predicted remaining available time of the oil filter at the set speed of the engine are obtained, and a reminder is sent to the user. max

[0013] Further, according to the set engine working period, the data of engine speed n and oil filter differential pressure Pd are obtained, specifically: during the engine operation, when the engine speed n is in the set working range, the cumulative operation time t of the engine since the last replacement of the oil filter, and when the oil temperature T reaches the set working range at the same time, the data of engine speed n and oil filter differential pressure Pd in the corresponding period are obtained.

[0014] Further, the obtained Pd-n curve is corrected, including: recording the differential pressure Pd of the oil filter at at least 3 speeds n within a period of engine operation without affecting the differential pressure of the oil filter under the same flow, and fitting to obtain the Pd-n curve closest to the actual situation.

[0015] Further, the obtained Pd-n curve is corrected, including: recording the differential pressure Pd of the oil filter at at least 3 speeds n within a period of engine operation without affecting the differential pressure of the oil filter under the same flow, and fitting to obtain the Pd-n curve closest to the actual situation. i i i

[0016] When the operation time t of the engine since the last replacement of the oil filter is greater than t1, the differential pressure Pd of the oil filter at different operation times of the engine at the highest speed is obtained according to f i (n), the corresponding data is substituted into and fitted to obtain the Pd-t curve closest to the actual situation of the engine at the highest speed, which is denoted as g n_max (t).

[0017] ​​​​Furthermore, the exponential function relationship between the oil filter pressure difference Pd and the service time t is the Pd-t curve, that is, Pd = d·e f·t Denoted as g(t), where d and f are function coefficients and e is the natural base.

[0018] Furthermore, the maximum oil filter pressure difference Pd allowed by the oil filter is max Substitute g n_max (t), get the estimated maximum usage time t max , the difference t from the current usage time t r max =t max -t is the estimated remaining available time of the engine at maximum speed.

[0019] Furthermore, when the engine is working at any speed, according to the Pd-t curve of the engine at the corresponding speed, it is recorded as g n_cur (t), substitute Pd max Get the estimated maximum service life of the oil filter t max , the difference t from the current usage time t r_cur =t max -t is the estimated remaining available time of the engine at the current speed.

[0020] Furthermore, a reminder is issued to the user, specifically:

[0021] When t r_max and t r_cur When both are greater than 0, the user is prompted to pay attention to the remaining usable time of the oil filter at the maximum engine speed and the current engine speed respectively;

[0022] When t r_max <0 and t r_cur When the value is >0, the user is prompted to pay attention to the remaining usable time of the oil filter at the current engine speed, and a warning is issued: "The oil filter no longer supports the engine operating at the highest speed. It is recommended that the user replace the oil filter in time."

[0023] When t r_max and t r_cur When both are less than 0, an alert to "replace the oil filter immediately" is issued to the user.

[0024] A second aspect of the present invention provides a system for implementing the above-mentioned engine oil filter maintenance warning method, comprising:

[0025] Speed ​​sensor, used to obtain engine speed n;

[0026] Differential pressure sensor, used to obtain the oil filter differential pressure Pd;

[0027] The processing unit is configured to: according to a set engine working period, obtain data of an engine speed n and an oil filter differential pressure Pd, and obtain a function relation curve between the differential pressure Pd and the speed n through fitting, which is denoted as a Pd-n curve;

[0028] The processing unit is further configured to: obtain the oil filter differential pressure Pd at a set speed according to the Pd-n curve, and obtain an exponential function relation between the oil filter differential pressure Pd and the use time t under the same oil flow and uniform speed blockage through correction processing of the obtained Pd-n curve;

[0029] The processing unit is further configured to: obtain the maximum differential pressure Pd allowed by the oil filter for use m ax The obtained exponential function relation is substituted into the obtained exponential function relation, the predicted maximum use time of the oil filter is obtained, and the predicted remaining available time of the oil filter under the highest speed of the engine and the predicted remaining available time of the oil filter under the set speed of the engine are obtained according to the current use time of the oil filter, and a prompt is sent to the user.

[0030] The third aspect of the present application provides a motor vehicle, which is equipped with the above-mentioned engine oil filter maintenance warning system.

[0031] Compared with the prior art, the above one or more technical solutions have the following beneficial effects:

[0032] By using the obtained data, the relation between the oil filter differential pressure and the engine speed is represented by a quadratic polynomial function, the relation between the oil filter differential pressure and the engine running time is represented by an exponential function, the function curve closest to the theoretical curve is obtained through fitting, the accuracy is higher than that of the Lagrange interpolation method or the Newton interpolation method, the oil filter life of the engine under the highest speed and the set target speed can be more accurately predicted, and the user can be prompted in advance when the engine works at a low speed. BRIEF DESCRIPTION OF DRAWINGS

[0033] The drawings accompanying the specification of the present application form a part of the present application and serve to provide a further understanding of the present application, the exemplary embodiments of the present application and the explanations thereof serve to explain the present application and do not constitute an improper limitation of the present application.

[0034] Figure 1 is a maintenance warning flowchart of an oil filter provided by one or more embodiments of the present application;

[0035] Figure 2 is a schematic diagram of the differential pressure-speed curve used during the maintenance warning of the oil filter provided by one or more embodiments of the present application;

[0036] Figure 3is a schematic diagram of the pressure difference-time curve used during the maintenance warning period of the oil filter provided by one or more embodiments of the present application. DETAILED DESCRIPTION

[0037] The present application is further described below in conjunction with the accompanying drawings and examples.

[0038] It should be noted that the following detailed description is exemplary in nature and is intended to provide further description of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0039] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0040] As described in the background, the way of periodically replacing or replacing the filter element of the oil filter when the pressure difference alarm occurs, when the engine is used lightly, the filter element may be replaced too early and wasted, and when the engine is used heavily, the filter element may not be replaced in time and the quality of the engine oil is affected. At the same time, the pressure difference of the oil filter of the engine is different when the engine works at different speeds, which may cause the pressure difference to be normal at low speed and to alarm at high speed, and the way of periodic replacement or replacement when the pressure difference alarm occurs may affect the user's judgment of whether the filter element should be replaced.

[0041] Some prior arts try to use mathematical methods to help people find the relationship and rules between the engine operation and the filter operation.

[0042] For example, the prior art CN112145291 records the pressure difference data, and then uses the Lagrange interpolation formula or the Newton interpolation formula to predict the available time length to reach the target pressure difference, so as to remind the user of the filter element maintenance opportunity in advance.

[0043] However, this method is only suitable for pressure difference analysis under constant flow of the filter. In actual situations, when the engine speed or oil consumption changes, the oil flow changes, and the pressure difference data will disturb the analysis results.

[0044] At the same time, the Lagrange interpolation formula or the Newton interpolation formula is suitable for predicting the function value corresponding to the target independent variable within the range of the existing independent variable based on the existing data, and is not suitable for predicting the function value corresponding to the target independent variable outside the range of the existing independent variable, and the error is large.

[0045] Therefore, the following embodiments give a maintenance warning method, system and motor vehicle of engine oil filter, using the oil filter differential pressure Pb and the corresponding engine speed n under the set working condition, the Pb-n curve reflecting the relationship between the two is fitted, and the Pb-n curve is converted into the relationship curve of the oil filter differential pressure Pb and the use time t under the corresponding working condition, i.e. Pd-t curve, using the maximum differential pressure Pd allowed to be used by the oil filter max into the Pd-t curve, the remaining available time of the oil filter under the highest engine speed is obtained, and the remaining available time under the set engine speed is obtained.

[0046] Embodiment one:

[0047] As shown in the figure, the maintenance warning method of the engine oil filter comprises the following steps: Figure 1

[0048] Under the selected engine working time, the engine speed n and the oil filter differential pressure Pd data are obtained, and the quadratic polynomial function curve closest to the Pd (differential pressure)-n (speed) relationship is fitted by the least square method;

[0049] According to the differential pressure-speed curve of the engine under the working time t, the oil filter differential pressure Pd under the selected speed is obtained, and the exponential function curve closest to the Pd-t relationship is fitted by the least square method;

[0050] The maximum allowable differential pressure Pd max is substituted into the function to obtain the maximum use time of the oil filter, and the remaining use time is estimated for the user in combination with the current use time. Especially when the differential pressure is not over limited at low speed in work, but does not meet the engine working at the highest speed, the user is timely warned.

[0051] In this embodiment, the engine configuration can be used to obtain, store and calculate sensor data, identify engine running state, record engine working time, and connect with instrument to display engine state value and alarm information for user; the electronic control unit is prior art, and the embodiment will not be described in detail.

[0052] The differential pressure sensor is arranged on the engine oil filter, or the pressure sensors are arranged before and after the filter, the differential pressure before and after the filter can be calculated by the difference, and the value is Pd. The differential pressure sensor and the pressure sensors before and after the filter are prior art, and the embodiment does not limit the way of obtaining differential pressure Pd, as long as the differential pressure Pd of the oil filter can be obtained.

[0053] ​The engine oil filter is provided with a temperature sensor, which can obtain the current temperature of the oil passing through the filter, and the value is T. The temperature sensor is also conventional technology, and this embodiment does not limit the type of temperature sensor, as long as it can obtain the temperature of the oil filter.

[0054] The engine is provided with a speed sensor, which can obtain the engine's operating speed, with a value of n. The speed sensor is a prior art and will not be described in detail in this embodiment.

[0055] like Figure 1 As shown, after the engine is running, when the engine speed n reaches the normal operating range, the engine operating time t since the last oil filter replacement is accumulated. At the same time, when the oil temperature T reaches the set operating range, the oil filter differential pressure Pd is recorded and analyzed to avoid the influence of large pressure differential caused by excessive viscosity of low-temperature oil on judgment. If it is not within the set operating range, the oil filter differential pressure Pd is recorded and analyzed again after the temperature T reaches the set operating range.

[0056] Without considering the gradual clogging of the filter element, the oil filter pressure difference Pd is proportional to the square of the oil flow Q 2 , and the oil pump flow Q is proportional to the engine speed n, then the oil filter pressure difference Pd is proportional to the square of the engine speed n 2 , the functional relationship Pd=a·n 2 +b·n+c is recorded as f(n). The coefficients a, b, and c are related to the design flow rates of the oil filter and the oil pump.

[0057] During a period of engine operation that does not affect the filter element pressure differential at the same flow rate, record the oil filter pressure differential Pd at at least three speeds n. The Pd-n curve closest to the actual situation can be calculated or fitted using the least squares method, and the curve a, b, and c values ​​when the engine runs to t0 can be obtained, recorded as f0(n). Based on this curve, the oil filter pressure differential Pd at any speed n can be calculated.

[0058] When the engine has been running for a preset time period up to t1, the pressure difference Pd-speed n curve at t1 is obtained by the above method and is recorded as f1(n).

[0059] Every time the engine runs for the preset time to t i When the Pd-n curve f is obtained i (n).

[0060] According to the test records, under the same flow rate, the pressure difference Pd of the oil filter with uniform clogging is exponentially related to the service time t. The functional relationship Pd=d·e f·t Denoted as g(t), where d and f are function coefficients, and e is the natural base.

[0061] When the engine has been running for a time t > t1 since the last oil filter replacement, the value of f i (n) The Pd-t curve of the engine at the highest engine speed is obtained. The data is substituted into g n_max (t) to obtain the predicted maximum service time t

[0062] The maximum allowable oil filter pressure difference Pd max is substituted into g n_max (t) to obtain the predicted maximum service time t max , and the difference t r_max =t max -t is the predicted remaining service time of the engine at the highest engine speed.

[0063] Similarly, when the engine is running at any speed, the Pd-t curve of the engine at the current speed is obtained, denoted as g n_cur (t), and the value of Pd max is substituted into g max (t) to obtain the predicted maximum service time t r_cur , and the difference t max =t r_max -t is the predicted remaining service time of the engine at the current speed.

[0064] When t r_cur and t r_max are both greater than 0, the instrument displays a reminder to the user that the engine has a remaining service time for the oil filter at the maximum speed and the current speed, respectively;

[0065] When t r_cur > 0, the instrument displays a reminder to the user that the engine has a remaining service time for the oil filter at the current speed, and warns that the oil filter cannot support the engine at the highest speed, and suggests that the user replace the oil filter in a timely manner;

[0066] When t r_max and t r_cur are both less than 0, the instrument displays a warning to the user to replace the oil filter immediately.

[0067] The instrument is provided with an oil filter life reset function. When the user replaces a new oil filter, the function resets the cumulative running time t of the engine since the last oil filter replacement in the electronic control unit, and re-records and predicts the remaining service time of the oil filter.

[0068] An example is given.

[0069] Assume that the Pd-n relationship at t0, t1 is shown in Table 1.

[0070] Table 1: Pd-n relationship

[0071]

[0072]

[0073] The following formula and function relationship shown in Figure 2

[0074] f0(n) = 5.33e-6·n 2 -3.6e-3·n+2.47

[0075] f1(n) = 8.33e-6·n 2 -4.17e-3·n+3

[0076] Assume that the current rotating speed is 1200 rpm, the maximum rotating speed is 1500 rpm, and the pressure difference Pd corresponding to each rotating speed at t0, t1 is shown in Table 2.

[0077] Table 2: Pressure difference Pd corresponding to selected rotating speed n

[0078] n (rpm) 1200 1500 [t0] Pd (kPa) 5.8267 9.0667 ​ Pd (kPa) 10 15.5

[0079] The above parameters are brought into the curve shown in Figure 2 Figure 3 and the curve shown in the following formula:

[0080] g n_cur (t) = 5.8267e 0.0054t

[0081] g n_max (t) = 9.0667e 0.0054t

[0082] Assume that Pd max = 80 kPa, and it is respectively brought into g n_cur (t) and g n_max (t), and the maximum use time length t max of the oil filter is respectively 406 h and 485 h, the remaining available time length t r_cur of the engine at the current rotating speed 1200 rpm after running for 100 h is predicted to be 385 h, and the remaining available time length t r_max of the engine at the maximum rotating speed 1500 rpm is predicted to be 306 h.

[0083] ​​The above method can predict the oil filter life of the engine at the highest speed and the target speed respectively according to the running data of the engine at different working time and different speed, and give a warning prompt to the user in advance when the engine works at low speed.

[0084] Based on the test data, the relationship between the oil filter pressure difference and the engine speed is represented by a quadratic polynomial function, and the relationship between the oil filter pressure difference and the engine running time is represented by an exponential function. The two parts are analyzed and predicted together. The function curve closest to the theoretical curve is fitted using the least square method, which has higher accuracy than the Lagrange interpolation method or the Newton interpolation method.

[0085] Embodiment two:

[0086] The system for implementing the maintenance warning method of the engine oil filter in embodiment one comprises:

[0087] A speed sensor is used to obtain the engine speed n.

[0088] A pressure difference sensor is used to obtain the oil filter pressure difference Pd.

[0089] The processing unit is configured to obtain the data of the engine speed n and the oil filter pressure difference Pd according to the set engine working time, and to obtain the function relationship curve between the pressure difference Pd and the speed n, denoted as Pd-n curve, through fitting.

[0090] The processing unit is further configured to obtain the oil filter pressure difference Pd at the set speed according to the Pd-n curve, and to obtain the exponential function relationship between the oil filter pressure difference Pd and the use time t under the same oil flow and uniform speed blockage by correcting the obtained Pd-n curve.

[0091] The processing unit is further configured to obtain the maximum pressure difference Pd allowed for use of the oil filter, and to obtain the maximum use time of the oil filter by substituting the obtained exponential function relationship. m ax The obtained maximum use time of the oil filter is substituted into the obtained exponential function relationship to obtain the predicted maximum use time of the oil filter, and the remaining available time of the oil filter at the highest speed of the engine and the remaining available time at the set speed of the engine are obtained according to the current use time of the oil filter, and a prompt is given to the user.

[0092] The engine running data at different working time and different speed can be used to predict the oil filter life of the engine at the highest speed and the target speed respectively, and a warning prompt can be given to the user in advance when the engine works at low speed.

[0093] Embodiment three:

[0094] A motor vehicle is equipped with the above-mentioned maintenance warning system for the engine oil filter.

[0095] The above description is only the preferred embodiment of the present application, and is not intended to limit the present application. The present application can have various changes and modifications for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method of maintenance warning for an engine oil filter, characterized in that, The method comprises the following steps: According to the set engine working period, the engine speed n and the oil filter pressure difference Pd data are obtained, and the function relationship curve between the pressure difference Pd and the speed n is fitted, which is recorded as the Pd-n curve; According to the Pd-n curve, the oil filter pressure difference Pd at the set speed is obtained, and the obtained Pd-n curve is corrected to obtain the exponential function relationship between the oil filter pressure difference Pd and the use time t under the same oil flow and uniform speed blockage. The maximum pressure difference Pd allowed for use by the oil filter max The predicted maximum service life of the oil filter is obtained by substituting the exponential function relationship, and according to the current service life of the oil filter, the predicted remaining available life of the oil filter at the highest engine speed and the predicted remaining available life of the oil filter at the set engine speed are obtained, and a reminder is sent to the user.

2. The engine oil filter maintenance warning method of claim 1 wherein: According to the set engine working period, the engine speed n and the oil filter pressure difference Pd data are obtained, and the function relationship curve between the pressure difference Pd and the speed n is fitted, which is recorded as the Pd-n curve; 3. The engine oil filter maintenance warning method of claim 1 wherein: The obtained Pd-n curve is corrected, including: recording the oil filter pressure difference Pd at at least three speeds n within a period of engine operation without affecting the oil filter pressure difference under the same flow, and fitting the Pd-n curve closest to the actual situation.

4. The engine oil filter maintenance warning method of claim 1 wherein: The obtained Pd-n curve is modified and also includes: when the engine runs through a preset service time t i , a differential pressure Pd-rotation speed n curve at t i is obtained, denoted as f i (n). When the engine has been running for a time t > t1 since the last oil filter replacement, according to f i (n) Obtain the oil filter differential pressure Pd of the engine at different running times at the highest speed, and substitute the corresponding data into and fit the Pd-t curve of the engine at the highest speed closest to the actual situation, denoted as g n_max (t).

5. The engine oil filter maintenance warning method of claim 1 wherein: The exponential function relationship between the differential pressure Pd of the oil filter and the service time t is a Pd-t curve, i.e. Pd=d·e f·t denoted as g(t), wherein d, f are function coefficients, and e is the natural base.

6. The engine oil filter maintenance warning method of claim 4 wherein: The maximum oil filter differential pressure Pd allowed for use by the oil filter max Substitute g n_max (t), to obtain the predicted maximum usage duration t max The difference t of the current usage duration t r_max = t max The predicted remaining available duration of the engine at the maximum speed is t - t.

7. The engine oil filter maintenance warning method of claim 6 wherein: When the engine is working at any speed, according to the Pd-t curve of the engine at the corresponding speed, denoted as g n_cur (t), substitute Pd max to get the predicted maximum service life t of the oil filter max , and the difference t between the current service life t r_cur = t max -t is the predicted remaining available time of the engine at the current speed.

8. The engine oil filter maintenance warning method of claim 7 wherein: The user is reminded, specifically: When t r_max and t r_cur are both greater than 0, the user is prompted to pay attention to the remaining available duration of the oil filter at the maximum speed and the current speed of the engine, respectively. When t r_max <0 and t r_cur >0, the user is prompted to pay attention to the remaining available duration of the oil filter at the current engine speed, and a pre-warning is issued that "the oil filter has not supported the engine working at the highest speed, and the user is suggested to replace the oil filter in time". When t r_max and t r_cur are both less than 0, an alert is issued to the user to "change oil filter immediately." 9. A maintenance warning system for an engine oil filter, characterized by It comprises: A speed sensor for obtaining the engine speed n; A differential pressure sensor for obtaining the oil filter pressure difference Pd; The processing unit is configured to obtain the engine speed n and the oil filter pressure difference Pd data according to the set engine working period, and to fit the function relationship curve between the pressure difference Pd and the speed n, which is recorded as the Pd-n curve; The processing unit is also configured to obtain the oil filter pressure difference Pd at the set speed according to the Pd-n curve, and to correct the obtained Pd-n curve to obtain the exponential function relationship between the oil filter pressure difference Pd and the use time t under the same oil flow and uniform speed blockage. The processing unit is further configured to: obtain a maximum pressure difference Pd allowed to be used by the oil filter max The exponential function relationship obtained by substituting the obtained maximum pressure difference Pd allowed to be used by the oil filter, the current pressure difference Pd of the oil filter, and the current temperature T of the oil filter into the obtained exponential function relationship, the predicted maximum use time of the oil filter is obtained, and the predicted remaining available time of the oil filter at the highest engine speed and the predicted remaining available time of the oil filter at the set engine speed are obtained according to the current use time of the oil filter, and a reminder is sent to the user.

10. A motor vehicle characterised in that, The engine oil filter maintenance warning system according to claim 9 is mounted.

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