Early warning method for engine oil emulsification, vehicle controller and vehicle

Abstract

The present invention provides a warning method for engine oil emulsification, a vehicle control unit, and a vehicle. The method includes: obtaining the oil pressure and starting torque when the engine is first started in each stage of the current maintenance cycle; obtaining the current oil pressure and current starting torque in the current stage, as well as the ambient temperature at the location where the engine is located, and determining the current oil pressure limit value and current starting torque limit value according to the ambient temperature, the standard limit value of the oil pressure, and the standard limit value of the starting torque respectively, and determining whether the deviation between the current oil pressure and the current oil pressure limit value is within the first deviation range and whether the deviation between the current starting torque and the current starting torque limit value is within the second deviation range; determining the number of warning events whose judgment result is negative, and generating and sending a reminder message for oil maintenance when the number of warning events is not zero. This solution takes into account the influence of oil pressure and starting torque when performing oil emulsification warning, and has a higher accuracy rate.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and particularly relates to a warning method for engine oil emulsification, a vehicle controller and a vehicle. Background Art

[0002] Engine oil has functions such as lubrication, cooling, washing, sealing, rust prevention and shock absorption, which can avoid dry friction, power loss, thermal deformation and damage between moving pairs, so as not to affect the normal operation of the engine. During the operation of the engine, the oil circulates continuously, and it is inevitable that fuel, water, metal impurities and combustion products enter the oil. At the same time, it is also affected by the shear of moving pairs and the combustion of the engine, which will cause a series of performance changes such as fuel dilution, viscosity attenuation and aging, affecting the normal use of the oil. Among them, the mixing of water into the oil will cause the oil to emulsify, accelerate the aging of the oil, and affect the fluidity of the oil when the temperature drops.

[0003] With the promotion of the national energy conservation and emission reduction policy, the hybrid vehicle market has gradually increased. Due to the characteristics of the engine of hybrid vehicles, such as relatively short running time, low power requirements for the engine working conditions, frequent start and stop of the engine, and uncertain running time, it is easier to have emulsification problems, which will shorten the oil life and even affect the vehicle safety. Therefore, it is extremely important to timely check the emulsification situation of the oil and replace the oil in time after the oil emulsifies during the oil maintenance process.

[0004] In the prior art, the method for warning oil maintenance is to compare the oil pressure of the target working condition with that of the test working condition to evaluate whether the oil is diluted as disclosed in the patent document CN113006900B. Although this method can determine whether the engine oil is diluted, this method only uses the oil pressure to evaluate whether the oil is diluted, and there is a problem of low accuracy of the evaluation result. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem of low accuracy of the evaluation result of abnormal oil warning in the prior art.

[0006] To solve the above problems, an embodiment of the present invention discloses a warning method for engine oil emulsification, including:

[0007] S1: Enter the current maintenance cycle, where the current maintenance cycle is divided into multiple stages at a preset first time interval, and the oil pressure and starting torque when the engine is first started in each stage are obtained in each stage;

[0008] S2: Obtain the current oil pressure, current starting torque when the engine is first started in the current stage, and the ambient temperature at the location where the engine is located. Determine the current oil pressure limit according to the ambient temperature and the preset standard limit value of the oil pressure, determine the current starting torque limit according to the ambient temperature and the preset standard limit value of the starting torque, and judge whether the deviation between the current oil pressure and the current oil pressure limit is within the preset first deviation range, and whether the deviation between the current starting torque and the current starting torque limit is within the preset second deviation range;

[0009] S3: Determine the number of warning events with a negative judgment result according to the judgment result of step S2, and judge whether the number of warning events is 0;

[0010] If so, obtain the oil pressure and starting torque of the next stage, and re-determine the number of warning events;

[0011] If not, generate and send a reminder message for oil maintenance.

[0012] Adopting the above solution, since oil emulsification can directly affect the fluidity of the oil, and then change the oil pressure and starting torque when the engine starts, this solution determines the situation of engine oil emulsification based on the oil pressure and starting torque together, and can accurately evaluate the situation of engine oil emulsification. Moreover, when it is determined that the oil has emulsified, this embodiment will generate a reminder message in time to remind the driver to change the oil, ensuring the use safety of the vehicle.

[0013] According to another specific embodiment of the present invention, in the warning method for engine oil emulsification disclosed in the embodiment of the present invention, step S2 further includes: obtaining the historical oil pressure and historical starting torque corresponding to each historical stage in a preset number of historical stages before the current stage, and calculating the average oil pressure according to the multiple historical oil pressures, calculating the average starting torque according to the multiple historical starting torques; and judging whether the deviation between the current oil pressure and the average oil pressure is within the preset third deviation range, and whether the deviation between the current starting torque and the average starting torque is within the preset fourth deviation range.

[0014] Adopting the above solution, since the average oil pressure and the average starting torque are both calculated from historical data, they can well reflect the state of the engine during a period of time before the current stage. If the oil pressure or starting torque changes significantly compared with the historical data, the possibility of abnormal oil increases. Therefore, by comprehensively considering the comparison result between the current oil pressure and the average oil pressure, and the comparison result between the current starting torque and the average starting torque, the accuracy of the evaluation of oil emulsification can be further improved.

[0015] According to another specific embodiment of the present invention, in the early warning method for engine oil emulsification disclosed in the embodiment of the present invention, in step S2, the current oil pressure limit value is determined according to the following formula:

[0016]

[0017] Wherein, Ps is the current oil pressure limit value, t is the ambient temperature, Pmax is the standard oil pressure limit value, and the standard oil pressure limit value is 370 when the ambient temperature is less than or equal to 0, and 368 when the ambient temperature is greater than 0.

[0018] And, the current starting torque limit value is determined according to the following formula:

[0019] Ts = -0.003t2 - 0.729t + Tmax

[0020] Wherein, Ts is the current starting torque limit value, t is the ambient temperature, Tmax is the standard starting torque limit value, and the standard starting torque limit value is proportional to the ambient temperature. The range of the ambient temperature is -30°C to 30°C, and the range of the standard starting torque limit value is 55 to 65.

[0021] Adopting the above solution, since the influence of the ambient temperature is considered when calculating the current oil pressure limit value and the previous starting torque limit value, the accuracy of the calculation result is further improved.

[0022] According to another specific embodiment of the present invention, in the early warning method for engine oil emulsification disclosed in the embodiment of the present invention, in step S3, if the number of warning events is not 0, the early warning method further includes:

[0023] Judging whether the number of warning events is greater than 1;

[0024] If so, generating and sending a reminder message for oil maintenance and a control instruction to prohibit the engine from starting again;

[0025] If not, only generating and sending a reminder message for oil maintenance; and after generating and sending the reminder message for oil maintenance, it further includes:

[0026] Obtaining the oil property information of the engine oil in the oil pan of the engine at a preset second time interval, and judging whether an oil change operation has been performed according to the oil property information;

[0027] If so, clearing the ambient temperature and oil property information obtained during the current maintenance cycle, and entering the next maintenance cycle;

[0028] If not, continuing to generate and send a reminder message for oil maintenance.

[0029] With the above solution, when the number of warnings is 2 or more, it indicates that the engine oil emulsification is relatively serious at this time, which may pose a threat to safe driving and the engine oil needs to be replaced as soon as possible. At this time, in addition to generating and sending reminder messages for engine oil maintenance, control instructions also need to be sent to engine control components such as the engine controller, and the engine is prohibited from starting again to reduce driving risks. When the number of warnings is only 1, it means that the engine oil emulsification is not very serious, and not replacing it this time will not pose a great threat to safe driving. At this time, only reminder messages can be sent to prompt the driver to replace the engine oil in time, and instructions such as prohibiting the engine from starting again will not be generated and sent, thus not having too much impact on the normal driving of the passengers and improving the driving experience of the passengers.

[0030] According to another specific embodiment of the present invention, in the early warning method for engine oil emulsification disclosed in the embodiment of the present invention, in step S1, the range of the preset first time interval is from 1 day to 3 days; in step S2, the range of the preset quantity is from 8 to 12; the first deviation range is 0.15 to 0.25 times the engine oil pressure limit value; the second deviation range is 0.05 times to 0.15 times the starting torque limit value; the third deviation range is 0.15 to 0.25 times the average engine oil pressure; the fourth deviation range is 0.05 times to 0.15 times the average starting torque; and, the range of the preset second time interval is from 2 days to 10 days; the engine oil attribute information includes the water content of the engine oil and the engine oil level; wherein, if the water content of the engine oil ≤ 0.1% and the engine oil level is flush with or higher than the preset highest level, it is determined that an engine oil replacement operation has been performed.

[0031] With the above solution, jointly judging whether an engine oil replacement operation has been performed by using the water content of the engine oil and the engine oil level can improve the judgment accuracy.

[0032] According to another specific embodiment of the present invention, in the early warning method for engine oil emulsification disclosed in the embodiment of the present invention, before performing the engine oil replacement operation, it further includes:

[0033] Obtain the emulsification risk assessment result of the current engine oil to be replaced;

[0034] If the emulsification risk assessment result shows that there is an emulsification risk, replace the current engine oil to be replaced;

[0035] If the emulsification risk assessment result shows that there is no emulsification risk, perform the engine oil replacement operation with the current engine oil to be replaced; wherein, the emulsification risk assessment result is obtained by the following steps:

[0036] Build a test bench by simulating the working conditions of high cold in winter;

[0037] Perform pre-running tests, emulsification tests, and cleaning tests on the current engine oil to be replaced in sequence based on a test bench, and obtain boundary parameter data representing the emulsification situation of the current engine oil to be replaced in real time;

[0038] Obtain an emulsification risk assessment result based on the boundary parameter data and preset boundary conditions.

[0039] Adopting the above solution, before replacing the engine oil, the emulsification risk assessment result of the current engine oil to be replaced will also be obtained, and when there is an emulsification risk in the current engine oil to be replaced, the current engine oil to be replaced will be replaced. In this way, the quality of the replaced engine oil can be better, the time cycle of engine oil replacement can be further extended, the driving experience can be improved, and the driving safety of the vehicle can be ensured.

[0040] According to another specific embodiment of the present invention, the warning method for engine oil emulsification disclosed in the embodiment of the present invention, the winter alpine working condition is a working condition that simultaneously satisfies the following conditions:

[0041] The vehicle usage frequency is less than once every 2 days, the single driving mileage is less than 20 km, the average vehicle speed is less than 60 km / h, the average parking time is greater than 6 h, and the test temperature is less than 0°C; and the pre-running test includes:

[0042] The engine operates at idle speed for 1 min, at a speed of 1500 rpm and a torque of 15 Nm for 10 s, at a speed of 2000 rpm and a torque of 15 Nm for 10 s, and at a speed of 1800 rpm and a torque of 30 Nm for 1 min and then stops for cooling, and data information of the engine's oil temperature sensor, water temperature sensor, gas temperature sensor, oil pressure sensor, and oil level sensor is obtained respectively; the data information of each sensor is compared with the preset data threshold respectively, and whether the measurement of each sensor is accurate is judged according to the comparison result;

[0043] If it is accurate, continue with the emulsification test;

[0044] If it is not accurate, replace the sensor with inaccurate measurement, and repeat the steps of the engine operating at idle speed for 1 min to stopping for cooling until the measurement of each sensor is accurate; and the emulsification test includes:

[0045] The engine operates at idle speed for 5 min, at a speed of 1500 rpm and a torque of 15 Nm for 10 s, at a speed of 2000 rpm and a torque of 15 Nm for 10 s, and at a speed of 1800 rpm and a torque of 30 Nm until the water temperature of the engine rises to 50°C and then stops for cooling, until the engine oil temperature in the oil pan of the engine is consistent with the test temperature, and the steps of the engine operating at idle speed for 5 min to stopping for cooling are cycled a predetermined number of times, and boundary parameter data when the engine is in the starting state during the emulsification test is obtained in real time;

[0046] The purge test includes:

[0047] The engine idles for 1 minute, operates at a speed of 2000 rpm and a torque of 15 Nm for 10 seconds, operates at a speed of 2000 rpm, a torque of 150 Nm and an engine water temperature of 90 °C for 10 minutes, operates at a speed of 2000 rpm and a torque of 15 Nm until the engine water temperature reaches 50 °C and then stops for cooling, and the water content of the oil to be replaced is obtained;

[0048] Determine whether the water content of the oil to be replaced is less than or equal to a preset water content threshold;

[0049] If so, repeat the steps of the engine idling for 1 minute until it stops until the water content of the oil to be replaced is less than or equal to the preset water content threshold;

[0050] If not, perform the step of judging whether there is an emulsification risk of the oil to be replaced according to the boundary parameter data and the preset boundary conditions.

[0051] According to another specific embodiment of the present invention, for the early warning method of engine oil emulsification disclosed in the embodiment of the present invention, the predetermined number of times is 4 to 6 times; the boundary parameter data includes oil level data and oil water content data; the preset boundary conditions include the position of the lowest point of the crank of the engine crankshaft and the oil water content of 3%; and, an emulsification risk assessment result is obtained according to the boundary parameter data and the preset boundary conditions, including: obtaining a liquid level curve according to the oil level data, and obtaining a water content curve according to the oil water content data; if the liquid level curve is always lower than the straight line representing the position of the lowest point of the crank and the water content curve is always lower than the straight line representing the water content of 3%, then there is no emulsification risk for the oil to be replaced; if the liquid level curve intersects with the straight line representing the position of the lowest point of the crank or the water content curve intersects with the straight line representing the water content of 3%, then there is an emulsification risk for the oil to be replaced; and, the data thresholds corresponding to each sensor are determined according to the industry average value; the preset water content threshold is 0.1%.

[0052] An embodiment of the present invention discloses a vehicle controller, including a memory for storing a control program; a processor, when processing the control program, executes the steps of the early warning method of engine oil emulsification described in any of the above embodiments.

[0053] An embodiment of the present invention discloses a vehicle, including the vehicle controller described in the above embodiment.

[0054] The beneficial effects of the present invention are:

[0055] The early warning method for engine oil emulsification provided by this solution determines the condition of engine oil emulsification based on the oil pressure and starting torque, and can accurately evaluate the condition of engine oil emulsification. Moreover, when it is determined that the oil has emulsified, this embodiment will promptly generate a reminder message to remind the driver to change the oil, ensuring the safety of vehicle use.

[0056] The vehicle provided by this embodiment, due to having a vehicle control unit that executes the early warning method for engine oil emulsification, can accurately identify the condition of oil emulsification and promptly remind the driver to replace it, improving the safety of vehicle use. Brief Description of the Drawings

[0057] Figure 1 is a flowchart of the early warning method for engine oil emulsification provided by an embodiment of the present invention;

[0058] Figure 2 is a standard oil pressure comparison deviation curve provided by an embodiment of the present invention;

[0059] Figure 3 is a standard starting torque comparison deviation curve provided by an embodiment of the present invention;

[0060] Figure 4 is a standard deviation curve of the comparison of historical oil pressure data provided by an embodiment of the present invention;

[0061] Figure 5 is a standard deviation curve of the comparison of historical starting torque data provided by an embodiment of the present invention. Detailed Description of the Embodiment

[0062] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Although the description of the present invention will be introduced in conjunction with preferred embodiments, this does not mean that the features of this invention are limited to this implementation manner. On the contrary, the purpose of introducing the invention in conjunction with the implementation manner is to cover other alternatives or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, many specific details will be included in the following description. The present invention can also be implemented without using these details. In addition, in order to avoid confusing or obscuring the key points of the present invention, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0063] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0064] In the description of this embodiment, it should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is customarily placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0065] Terms such as "first", "second", etc. are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0066] In the description of this embodiment, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0067] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the drawings.

[0068] Embodiment 1:

[0069] To solve the problem of low accuracy of the evaluation results for abnormal engine oil warning in the prior art, this embodiment provides a warning method for engine oil emulsification. Specifically, refer to Figure 1 . The warning method for engine oil emulsification provided in this embodiment includes the following steps:

[0070] S1: Enter the current maintenance cycle. Among them, the current maintenance cycle is divided into multiple stages at a preset first time interval, and the engine oil pressure and starting torque when the engine is first started in each stage are obtained.

[0071] S2: Obtain the current engine oil pressure and current starting torque when the engine is first started in the current stage, as well as the ambient temperature at the location where the engine is located. Determine the current engine oil pressure limit according to the ambient temperature and the preset engine oil pressure standard limit value, determine the current starting torque limit according to the ambient temperature and the preset starting torque standard limit value, and judge whether the deviation between the current engine oil pressure and the current engine oil pressure limit is within the preset first deviation range, and whether the deviation between the current starting torque and the current starting torque limit is within the preset second deviation range.

[0072] S3: Determine the number of warning events with a negative judgment result according to the judgment result in step S2, and determine whether the number of warning events is 0;

[0073] If so, obtain the oil pressure and starting torque in the next stage, and re-determine the number of warning events;

[0074] If not, generate and send a reminder message for oil maintenance.

[0075] Specifically, in step S1, the preset range of the first time interval is from 1 day to 3 days. It can be 1 day, 1.5 days, 2.5 days, 3 days, or other values within this range. The specific first time interval can be adjusted according to seasonal changes. For example, in autumn and winter, the vehicle usage frequency is relatively low, and the first time interval can be set longer; in spring and summer, the vehicle usage frequency is relatively high, and the first time interval can be set shorter. In this embodiment, the range of the first time interval is taken as 1 day for illustration. That is, the current maintenance cycle is divided into multiple stages at an interval of 1 day, and in this embodiment, it is necessary to obtain the oil pressure and starting torque of the engine when the engine is started for the first time every day. It should be noted that the current maintenance cycle starts from the time when the oil is changed until the oil is changed again. For this embodiment, the current maintenance cycle is not fixed and is related to the situation of oil emulsification. And the oil pressure can be obtained through an oil pressure sensor, and the starting torque can be obtained through a torque sensor.

[0076] In step S2, the first deviation range is 0.15 to 0.25 times the oil pressure limit value. For example, it can be 0.15 times, 0.2 times, 0.25 times, or other values within this range. In this embodiment, as Figure 2 shown, the first deviation range is taken as 0.2 times the oil pressure limit value for illustration. The second deviation range is 0.05 to 0.15 times the starting torque limit value. For example, it can be 0.05 times, 0.1 times, 0.15 times, or other values within this range. In this embodiment, as Figure 3 shown, the second deviation range is taken as 0.1 times the starting torque limit value for illustration.

[0077] In step S3, the warning event is the event whose judgment result in step S2 is negative. Specifically, it means that the current engine oil pressure exceeds ±0.2 times of the current engine oil pressure limit value, and the current starting torque exceeds ±0.2 times of the current starting torque limit value. When only the current engine oil pressure or the current starting torque exceeds the preset range, the number of warning events is 1; if both the current engine oil pressure and the current starting torque exceed the preset range, the number of warning events is 2; if neither the current engine oil pressure nor the current starting torque exceeds the preset range, the number of warning events is 0. Moreover, when the number of warning events is 0, it indicates that the engine oil does not emulsify in the current stage, and the corresponding data of the next stage can be obtained, and the number of warning events can be re-determined, and it continues to judge whether the engine oil emulsifies in the next stage. When the number of warning events is greater than 0, a reminder message for engine oil maintenance needs to be generated and sent to prompt the driver to change the engine oil in time.

[0078] It should be noted that the data acquisition process in this embodiment is actually measured by sensors arranged everywhere on the vehicle body. After the sensors acquire the data, they directly send it to the vehicle controller, and the vehicle controller performs corresponding operations, generates a reminder message according to the operation result, and sends text reminders, sound reminders, light reminders, etc. to the in-vehicle screen or in-vehicle instrument to indicate that the engine oil needs to be changed in time.

[0079] With such steps, since engine oil emulsification can directly affect the fluidity of the engine oil, and then change the engine oil pressure and starting torque when the engine starts, this solution can accurately evaluate the engine oil emulsification situation by jointly determining the engine oil emulsification situation based on the engine oil pressure and starting torque. Moreover, when it is determined that the engine oil emulsifies, this embodiment will timely generate a reminder message to remind the driver to change the engine oil, ensuring the safety of vehicle use.

[0080] Further, in the early warning method for engine oil emulsification according to the present invention, step S2 further includes: obtaining the historical oil pressure and historical starting torque corresponding to each of a preset number of historical stages before the current stage, and calculating the average oil pressure based on the multiple historical oil pressures and calculating the average starting torque based on the multiple historical starting torques. Specifically, the preset number should not be too large, otherwise the data acquisition time will be relatively long and the execution efficiency of the early warning method will be low; the preset number should not be too small either, otherwise it will affect the accuracy of the calculated average oil pressure and starting torque. In this embodiment, in order to achieve a good balance between calculation efficiency and calculation accuracy, the range of the preset number is set to 8 to 12, for example, it can be 8, 10, 12, or other values within this range. In the subsequent description, 10 is taken as an example for illustration. It should be understood that if the current stage is the first stage of the current maintenance cycle, the historical stages can be the last 10 stages of the previous maintenance cycle. That is to say, the historical stages in this embodiment are not necessarily all within the current maintenance cycle, and may also include several stages of the previous maintenance cycle.

[0081] Further, in the early warning method for engine oil emulsification according to the present invention, step S2 further includes: determining whether the deviation between the current oil pressure and the average oil pressure is within a preset third deviation range, and whether the deviation between the current starting torque and the average starting torque is within a preset fourth deviation range.

[0082] Specifically, the third deviation range is 0.15 to 0.25 times the average oil pressure, for example, it can be 0.15 times, 0.2 times, 0.25 times, or other values within this range. In this embodiment, as Figure 4 shown, taking the third deviation range as 0.2 times the average oil pressure as an example for illustration. The fourth deviation range is 0.05 times to 0.15 times the average starting torque, for example, it can be 0.05 times, 0.1 times, 0.15 times, or other values within this range. In this embodiment, as Figure 5 shown, taking the fourth deviation range as 0.1 times the average starting torque as an example for illustration.

[0083] That is to say, in this embodiment, the number of early warning events can also be comprehensively determined based on the comparison result between the current oil pressure and the average oil pressure, and the comparison result between the current starting torque and the average starting torque. The early warning events include that the current oil pressure exceeds ±0.2 times the average oil pressure, and the current starting torque exceeds ±0.2 times the average starting torque.

[0084] In this embodiment, if the number of warning events is comprehensively determined by the comparison results of the current oil pressure and the current oil pressure limit value, the current starting torque and the current starting torque limit value, the comparison result of the current oil pressure and the average oil pressure, and the comparison result of the current starting torque and the average starting torque, there may be five cases for the number of warning events: 0, 1, 2, 3, and 4. Among them, when the number of warning events is 0, it indicates that the oil does not emulsify in the current stage. The corresponding data for the next stage can be obtained, the number of warning events can be re-determined, and it can continue to be judged whether the oil emulsifies in the next stage. When the number of warning events is greater than 0, a reminder message for oil maintenance needs to be generated and sent to prompt the driver to change the oil in time.

[0085] More specifically, there is such a method. Since the average oil pressure and the average starting torque are both calculated from historical data, they can well reflect the state of the engine during a period of time before the current stage. If the oil pressure or the starting torque changes significantly compared with the historical data, the possibility of abnormal oil increases. Therefore, by comprehensively considering the comparison result of the current oil pressure and the average oil pressure, and the comparison result of the current starting torque and the average starting torque, the accuracy of the evaluation of oil emulsification can be further improved.

[0086] Further, in the warning method for engine oil emulsification according to the present invention, in step S2, the current oil pressure limit value is determined according to the following formula:

[0087]

[0088] Where Ps is the current oil pressure limit value, t is the ambient temperature, Pmax is the standard oil pressure limit value, and the standard oil pressure limit value takes 370 when the ambient temperature is less than or equal to 0, and takes 368 when the ambient temperature is greater than 0. Specifically, Table 1 shows the specific values of the current oil pressure limit value calculated according to the above formula at different temperatures.

[0089] Further, in the warning method for engine oil emulsification according to the present invention, in step S2, the current starting torque limit value is determined according to the following formula:

[0090] Ts = -0.003t2 - 0.729t + Tmax

[0091] Where Ts is the current starting torque limit value, t is the ambient temperature, Tmax is the standard starting torque limit value, and the standard starting torque limit value is proportional to the ambient temperature. The range of the ambient temperature is -30°C to 30°C, and the range of the standard starting torque limit value is 55 to 65. Specifically, Table 2 shows the specific values of the current starting torque limit value calculated according to the above formula at different temperatures.

[0092] More specifically, in this embodiment, since the influence of the ambient temperature is considered when calculating the current engine oil pressure limit value and the starting torque limit value, the accuracy of the calculation result is further improved.

[0093] Table 1

[0094] Engine oil temperature / °C -30 -20 -10 0 10 20 30 Engine oil pressure / kPa 370 370 370 370 300 250 180

[0095] Table 2

[0096] Engine oil temperature / °C -30 -25 -20 -15 -10 -5 0 Starting torque / Nm 79.50 75.00 72.38 69.98 67.73 63.53 60.68 Engine oil temperature / °C 5 10 15 20 25 30 Starting torque / Nm 55.05 51.45 49.50 45.00 39.75 36.00

[0097] Further, in the early warning method for engine oil emulsification according to the present invention, in step S3, if the number of early warning events is not 0, the early warning method further includes:

[0098] Determine whether the number of early warning events is greater than 1;

[0099] If so, generate and send a reminder message for engine oil maintenance and a control instruction to prohibit the engine from starting again;

[0100] If not, only generate and send a reminder message for engine oil maintenance.

[0101] That is to say, when the number of early warnings is 2 or more, it indicates that the engine oil emulsification is relatively serious at this time, which may pose a threat to safe driving and the engine oil needs to be replaced as soon as possible. At this time, in addition to generating and sending a reminder message for engine oil maintenance, a control instruction also needs to be sent to an engine control component such as an engine controller to prohibit the engine from starting again to reduce the driving risk. When the number of early warnings is only 1, it means that the engine oil emulsification is not very serious, and not replacing it this time will not pose a great threat to safe driving. At this time, only a reminder message can be sent to prompt the driver to replace the engine oil in time, and an instruction to prohibit the engine from starting again will not be generated and sent, so as not to have too much impact on the normal driving of the occupants and improve the driving experience of the occupants. It should be noted that prohibiting the engine from starting again can be achieved by making the output torque or speed of the engine 0.

[0102] Furthermore, in the early warning method for engine oil emulsification according to the present invention, after generating and sending a reminder message for engine oil maintenance, it further includes:

[0103] Obtain the engine oil property information of the engine oil in the oil pan of the engine at a preset second time interval, and determine whether an engine oil replacement operation has been performed according to the engine oil property information;

[0104] If so, clear the ambient temperature and engine oil property information obtained during the current maintenance cycle, and enter the next maintenance cycle;

[0105] If not, continue to generate and send reminder information for engine oil maintenance.

[0106] Specifically, the range of the preset second time interval is from 2 days to 10 days. For example, it can be 2 days, 5 days, 8 days or 10 days. The time length of the second time interval can be determined according to the time length of the first time interval. If the first time interval is short, the second time interval should not be too long, otherwise problems may occur after information acquisition and judgment operations. And, the engine oil attribute information includes the water content of the engine oil and the oil level. Among them, if the water content of the engine oil ≤ 0.1% and the oil level is flush with or higher than the preset highest oil level, it is determined that an engine oil replacement operation has been performed. And, the water content of the engine oil can be detected not only by a water content detection instrument, but also by common water content detection methods such as visual inspection method, combustion method, heating precipitation method, water discharge method or oil film method. The oil level can be measured by a level sensor.

[0107] Further, in the early warning method for engine oil emulsification according to the present invention, before performing the engine oil replacement operation, the following steps are further included:

[0108] Obtain the emulsification risk assessment result of the current engine oil to be replaced;

[0109] If the emulsification risk assessment result is that there is an emulsification risk, replace the current engine oil to be replaced;

[0110] If the emulsification risk assessment result is that there is no emulsification risk, use the current engine oil to be replaced for the engine oil replacement operation.

[0111] And, the emulsification risk assessment result is obtained by the following steps:

[0112] First, build a test bench by simulating the working conditions of high cold in winter;

[0113] Secondly, based on the test bench, perform a pre-run test, an emulsification test and a cleaning test on the current engine oil to be replaced in sequence, and obtain boundary parameter data representing the emulsification situation of the current engine oil to be replaced in real time;

[0114] After that, obtain the emulsification risk assessment result according to the boundary parameter data and the preset boundary conditions.

[0115] That is to say, in this embodiment, before changing the engine oil, the emulsification risk assessment result of the engine oil to be changed currently will be obtained, and when there is an emulsification risk in the currently to-be-changed engine oil, the currently to-be-changed engine oil will be changed. By adopting such a method, the quality of the changed engine oil can be better, the time period for changing the engine oil can be further extended, the driving experience can be improved, and the driving safety of the vehicle can be ensured. It should be noted that the emulsification risk assessment result of the engine oil is measured through a bench test before mass production of the engine oil. The emulsification risk assessment result of the engine oil can be obtained through the instruction manual of the engine oil. For engine oil production enterprises, obtaining the emulsification risk assessment result of the engine oil through a bench test before mass production of a certain type of engine oil can, during subsequent production, appropriately increase the production volume of the engine oil with a better emulsification risk assessment result and reduce the production volume of the engine oil with a poor emulsification risk assessment result, thereby improving the overall quality of engine oil production of the enterprise.

[0116] Specifically, the working conditions in cold winter are the working conditions that simultaneously meet the following conditions: the vehicle usage frequency is less than once every two days, the single driving mileage is less than 20 km, the average vehicle speed is less than 60 km / h, the average parking time is greater than 6 h, and the test temperature is less than 0 °C.

[0117] Furthermore, in the early running experiment of the early warning method for engine oil emulsification according to the present invention, the early running experiment includes the following steps:

[0118] First, the engine operates at idle speed for 1 min, at a speed of 1500 rpm and a torque of 15 Nm for 10 s, at a speed of 2000 rpm and a torque of 15 Nm for 10 s, and at a speed of 1800 rpm and a torque of 30 Nm for 1 min and then stops for cooling. Specifically, it can refer to Table 3 below, and the data information of the engine oil temperature sensor, water temperature sensor, gas temperature sensor, oil pressure sensor, and engine oil level sensor is obtained respectively. Among them, the engine oil temperature sensor is used to obtain the engine oil temperature in the oil pan and the main oil passage, and includes multiple engine oil temperature sensors arranged at each required position. The water temperature sensor is used to obtain the engine water temperature. The gas temperature sensor is used to obtain the gas temperature in the pre-separation chamber of the breathing system, the gas temperature at the inlet of the oil-gas separator, the temperature of the full breathing pipe (make-up air pipe), and the temperature of the camshaft cover, and includes multiple temperature sensors arranged at each required position. The oil pressure sensor is used to obtain the engine oil pressure in the main oil passage and the crankcase pressure. The engine oil level sensor is used to obtain the engine oil level. Of course, in this embodiment, a humidity sensor can also be set to detect the atmospheric humidity, a water content measuring instrument can be set to detect the water content in the engine oil, and a voltage and current measuring instrument can be set to detect the starting voltage and current corresponding to engine starting.

[0119] Table 3

[0120]

[0121] Secondly, compare the data information of each sensor with the preset data threshold respectively, and judge whether the measurement of each sensor is accurate according to the comparison result;

[0122] If it is accurate, continue with the emulsification test;

[0123] If it is not accurate, replace the sensor with inaccurate measurement, and repeat the steps of the engine working at idle speed for 1 min until it stops cooling until the measurement of each sensor is accurate.

[0124] It should be noted that the data threshold corresponding to each sensor is determined according to the industry average.

[0125] Furthermore, in the early warning method for engine oil emulsification according to the present invention, the emulsification test includes the following steps:

[0126] The engine works at idle speed for 5 min, works at a speed of 1500 rpm and a torque of 15 Nm for 10 s, works at a speed of 2000 rpm and a torque of 15 Nm for 10 s, works at a speed of 1800 rpm and a torque of 30 Nm until the water temperature of the engine rises to 50 °C and then stops cooling, until the oil temperature in the oil pan of the engine is consistent with the test temperature, and the steps of the engine working at idle speed for 5 min until it stops cooling are cycled a predetermined number of times, and the boundary parameter data when the engine is in the starting state during the emulsification test are obtained in real time. Specifically, reference can be made to Table 4 below.

[0127] Table 4

[0128]

[0129]

[0130] Specifically, the predetermined number of times is 4 to 6 times. In this embodiment, 5 times is taken as an example for illustration. The boundary parameter data includes oil level data and oil water content data.

[0131] Furthermore, in the early warning method for engine oil emulsification according to the present invention, the cleaning test includes the following steps:

[0132] First, the engine works at idle speed for 1 min, works at a speed of 2000 rpm and a torque of 15 Nm for 10 s, works at a speed of 2000 rpm, a torque of 150 Nm and a water temperature of 90 °C of the engine for 10 min, works at a speed of 2000 rpm and a torque of 15 Nm until the water temperature of the engine reaches 50 °C and then stops cooling, and the water content of the oil to be replaced is obtained. Specifically, reference can be made to Table 5 below.

[0133] Table 5

[0134]

[0135] Secondly, determine whether the water content of the oil to be replaced is less than or equal to a preset water content threshold;

[0136] If so, repeat the steps of the engine idling for 1 min until it stops, until the water content of the oil to be replaced is less than or equal to the preset water content threshold;

[0137] If not, perform the step of judging whether there is an emulsification risk of the oil to be replaced according to the boundary parameter data and the preset boundary conditions.

[0138] Specifically, the preset boundary conditions include the lowest position of the crank throw of the engine crankshaft and the water content of the oil being 3%. The preset water content threshold is 0.1%.

[0139] Furthermore, in the early warning method for engine oil emulsification according to the present invention, obtaining an emulsification risk assessment result according to the boundary parameter data and the preset boundary conditions includes the following steps:

[0140] Obtain a liquid level curve according to the oil level data, and obtain a water content curve according to the water content data of the oil; if the liquid level curve is always lower than the straight line representing the lowest position of the crank throw and the water content curve is always lower than the straight line representing the water content of 3%, then there is no emulsification risk for the oil to be replaced; if the liquid level curve intersects the straight line representing the lowest position of the crank throw or the water content curve intersects the straight line representing the water content of 3%, then there is an emulsification risk for the oil to be replaced.

[0141] Embodiment 2:

[0142] Based on the above early warning method for engine oil emulsification, this embodiment provides a specific early warning method for engine oil emulsification.

[0143] First, enter the current maintenance cycle. Detect the oil pressure and starting torque when the engine is first started every day through the oil pressure sensor and torque sensor of the engine. And, the oil pressure sensor and torque sensor send the detected oil pressure and starting torque to the vehicle controller.

[0144] Secondly, the oil pressure sensor and torque sensor of the engine obtain the current oil pressure and current starting torque when the engine is first started today. And, obtain the ambient temperature at the location where the engine is located through the temperature sensor. The above data are also sent to the vehicle controller.

[0145] After that, the vehicle controller calculates the current engine oil pressure limit value according to the environmental temperature and the standard limit value of the engine oil pressure, and uses the current engine oil pressure limit value determination formula; calculates the current starting torque limit value according to the environmental temperature and the standard limit value of the starting torque, and uses the current starting torque limit value determination formula; calculates the average engine oil pressure by averaging the historical engine oil pressures of the ten stages before the current stage; calculates the average starting torque by averaging the historical starting torques of the ten stages of the current stage. Then it determines whether the deviation between the current engine oil pressure and the current engine oil pressure limit value is within the deviation range of ±0.2 times of the current engine oil pressure limit value, whether the deviation between the current starting torque and the current starting torque limit value is within the deviation range of ±0.1 times of the starting torque limit value, whether the deviation between the current engine oil pressure and the average engine oil pressure is within the deviation range of ±0.2 times of the average engine oil pressure, and whether the deviation between the current starting torque and the average starting torque is within the deviation range of ±0.1 times of the average starting torque.

[0146] Next, according to the judgment results of the above four judgment events, the number of warning events with the judgment result of "no" is determined. When the number of warning events is 0, it waits to obtain the engine oil pressure and starting torque at the first start of the engine tomorrow, and continues to determine the number of warning events. When the number of warning events is 1, the vehicle controller sends a reminder message for engine oil maintenance to the in-vehicle central control screen. When the number of warning events is 2, 3, or 4, the vehicle controller sends a reminder message for engine oil maintenance to the in-vehicle central control screen, and at the same time sends a control message to the engine controller to set the torque output when the engine starts next time to 0, so as to achieve the goal of prohibiting the engine from starting again.

[0147] Assume that the warning number in this embodiment is 1, then only a reminder message for engine oil maintenance is sent to the central control screen. And after sending the reminder message for engine oil maintenance, the water content and oil level of the engine oil in the engine oil sump are obtained every 3 days. When the water content of the engine oil ≤ 0.1% and the oil level is flush with or higher than the preset highest level, it indicates that the engine oil replacement operation has been performed. After the vehicle controller clears the temperature information, engine oil water content information, and oil level information from the temperature sensor, it enters the next maintenance cycle.

[0148] Embodiment 3:

[0149] Based on the above warning method for engine oil emulsification, this embodiment provides a vehicle controller, including a memory and a processor.

[0150] Among them, the memory is used to store the control program. When processing the control program, the processor executes the steps of the early warning method for engine oil emulsification described in any of the above embodiments. Specifically, the memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of, for example, read-only memory (ROM) or flash RAM. The processor is a hardware circuit with data processing functions, such as a CPU, etc.

[0151] Embodiment 4:

[0152] Based on the above vehicle controller, this embodiment provides a vehicle including the vehicle controller described in the above embodiments.

[0153] The vehicle described in this embodiment includes, but is not limited to, traditional fuel vehicles and may also be a hybrid vehicle. The hybrid system of the hybrid vehicle may be a gasoline-electric hybrid system (HEV), a plug-in hybrid system (PHEV), an extended-range electric vehicle (REEV), and a 48V hybrid system.

[0154] Although the present invention has been illustrated and described by referring to some preferred embodiments of the present invention, those of ordinary skill in the art should understand that the above content is a further detailed description of the present invention in combination with specific embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to these descriptions. Those skilled in the art can make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A warning method for engine oil emulsification, characterized in that, Including: S1: Enter the current maintenance cycle. The current maintenance cycle is divided into multiple stages at a preset first time interval, and the oil pressure and starting torque when the engine is first started within each stage are obtained; S2: Obtain the current oil pressure and current starting torque when the engine is first started within the current stage, and the ambient temperature at the location where the engine is located. Determine the current oil pressure limit according to the ambient temperature and the preset oil pressure standard limit value, determine the current starting torque limit according to the ambient temperature and the preset starting torque standard limit value, and judge whether the deviation between the current oil pressure and the current oil pressure limit is within the preset first deviation range, and whether the deviation between the current starting torque and the current starting torque limit is within the preset second deviation range; S3: Determine the number of warning events with a negative judgment result according to the judgment result of step S2, and judge whether the number of warning events is 0; If so, obtain the oil pressure and starting torque of the next stage, and re-determine the number of warning events; If not, generate and send a reminder message for oil maintenance.

2. The warning method for engine oil emulsification according to claim 1, characterized in that, Step S2 further includes: obtaining the historical oil pressure and historical starting torque corresponding to each historical stage in a preset number of historical stages before the current stage, calculating the average oil pressure according to the multiple historical oil pressures, and calculating the average starting torque according to the multiple historical starting torques; and Judge whether the deviation between the current oil pressure and the average oil pressure is within the preset third deviation range, and whether the deviation between the current starting torque and the average starting torque is within the preset fourth deviation range.

3. The early warning method for engine oil emulsification according to claim 2, characterized in that, In step S2, the current oil pressure limit is determined according to the following formula: where Ps is the current oil pressure limit, t is the ambient temperature, Pmax is the oil pressure standard limit value, and the oil pressure standard limit value takes 370 kpa when the ambient temperature is less than or equal to 0 °C, and takes 368 kpa when the ambient temperature is greater than 0 °C; and The current starting torque limit is determined according to the following formula: Ts = -0.003t 2 -0.729t + Tmax where Ts is the current starting torque limit, t is the ambient temperature, Tmax is the starting torque standard limit value, and the starting torque standard limit value is proportional to the ambient temperature. The range of the ambient temperature is -30 °C to 30 °C, and the range of the starting torque standard limit value is 55 Nm to 65 Nm.

4. The early warning method for engine oil emulsification according to claim 3, wherein In step S3, if the number of warning events is not 0, the warning method further includes: Judge whether the number of warning events is greater than 1; If so, generate and send a reminder message for oil maintenance and a control instruction to prohibit the engine from starting again; If not, only generate and send a reminder message for oil maintenance; and After generating and sending the reminder message for oil maintenance, it further includes: Obtain the oil property information of the oil in the oil pan of the engine at a preset second time interval, and judge whether an oil change operation has been performed according to the oil property information; If so, clear the environmental temperature and the engine oil property information obtained during the current maintenance cycle, and enter the next maintenance cycle; If not, continue to generate and send reminder information for engine oil maintenance.

5. The warning method for engine oil emulsification according to claim 4, characterized in that, In the step S1, the range of the preset first time interval is from 1 day to 3 days; In the step S2, the range of the preset quantity is from 8 to 12; The first deviation range is 0.15 to 0.25 times the engine oil pressure limit value; The second deviation range is 0.05 to 0.15 times the starting torque limit value; The third deviation range is 0.15 to 0.25 times the average engine oil pressure; The fourth deviation range is 0.05 to 0.15 times the average starting torque; and The range of the preset second time interval is from 2 days to 10 days; The engine oil property information includes the water content of the engine oil and the engine oil level; where If the water content of the engine oil ≤ 0.1% and the engine oil level is flush with or higher than the preset maximum level, it is determined that an engine oil replacement operation has been performed.

6. The warning method for engine oil emulsification according to claim 5, wherein, Before performing the engine oil replacement operation, it further includes: Obtaining the emulsification risk assessment result of the current engine oil to be replaced; If the emulsification risk assessment result is that there is an emulsification risk, replace the current engine oil to be replaced; If the emulsification risk assessment result is that there is no emulsification risk, use the current engine oil to be replaced for the engine oil replacement operation; where The emulsification risk assessment result is obtained by the following steps: Build a test bench by simulating the working conditions of high cold in winter; Based on the test bench, perform a pre-run test, an emulsification test, and a cleaning test on the current engine oil to be replaced in sequence, and obtain the boundary parameter data representing the emulsification situation of the current engine oil to be replaced in real time; Obtain the emulsification risk assessment result according to the boundary parameter data and the preset boundary conditions.

7. The warning method for engine oil emulsification according to claim 6, wherein The working conditions of high cold in winter are the working conditions that simultaneously meet the following conditions: The vehicle usage frequency is less than once every 2 days, the single driving mileage is less than 20 km, the average vehicle speed is less than 60 km / h, the average parking time is greater than 6 h, and the test temperature is less than 0°C; and The pre-run experiment includes: The engine works at idle speed for 1 min, works at a speed of 1500 rpm and a torque of 15 Nm for 10 s, works at a speed of 2000 rpm and a torque of 15 Nm for 10 s, works at a speed of 1800 rpm and a torque of 30 Nm for 1 min and then stops for cooling, and respectively obtain the data information of the engine oil temperature sensor, the water temperature sensor, the gas temperature sensor, the oil pressure sensor, and the engine oil level sensor; Compare the data information of each sensor with the preset data threshold respectively, and judge whether the measurement of each sensor is accurate according to the comparison result; If it is accurate, continue with the emulsification test; If it is not accurate, replace the sensor with inaccurate measurement, and repeat the steps of the engine working at idle speed for 1 min to stopping for cooling until the measurement of each sensor is accurate; and The emulsification test includes: The engine operates at idle speed for 5 minutes, then operates at a speed of 1500 rpm and a torque of 15 Nm for 10 seconds, then operates at a speed of 2000 rpm and a torque of 15 Nm for 10 seconds, and then operates at a speed of 1800 rpm and a torque of 30 Nm until the water temperature of the engine rises to 50 °C, after which it stops for cooling until the oil temperature in the oil pan of the engine is consistent with the test temperature. The steps of the engine operating at idle speed for 5 minutes until stopping for cooling are cycled a predetermined number of times, and the boundary parameter data of the engine in the starting state during the emulsification test is obtained in real time; The cleaning test includes: The engine operates at idle speed for 1 minute, then operates at a speed of 2000 rpm and a torque of 15 Nm for 10 seconds, then operates at a speed of 2000 rpm, a torque of 150 Nm, and the water temperature of the engine at 90 °C for 10 minutes, and then operates at a speed of 2000 rpm and a torque of 15 Nm until the water temperature of the engine reaches 50 °C, after which it stops for cooling, and the water content of the oil to be replaced is obtained; Judge whether the water content of the oil to be replaced is less than or equal to a preset water content threshold; If so, repeat the steps of the engine operating at idle speed for 1 minute until stopping until the water content of the oil to be replaced is less than or equal to the preset water content threshold; If not, execute the step of judging whether the oil to be replaced has an emulsification risk according to the boundary parameter data and the preset boundary conditions.

8. The early warning method for engine oil emulsification according to claim 7, characterized in that, The predetermined number of times is 4 to 6 times; The boundary parameter data includes oil level data and oil water content data; The preset boundary conditions include the lowest position of the crank throw of the engine crankshaft and the oil water content of 3%; And Obtaining the emulsification risk assessment result according to the boundary parameter data and the preset boundary conditions includes: Obtaining a liquid level curve according to the oil level data and obtaining a water content curve according to the oil water content data; If the liquid level curve is always below the straight line representing the lowest position of the crank throw and the water content curve is always below the straight line representing the water content of 3%, then the oil to be replaced has no emulsification risk; If the liquid level curve intersects with the straight line representing the lowest position of the crank throw or the water content curve intersects with the straight line representing the water content of 3%, then the oil to be replaced has an emulsification risk; and The data threshold corresponding to each sensor is determined according to the industry average value; The preset water content threshold is 0.1%.

9. A vehicle controller, characterized in that, Includes: A memory for storing a control program; A processor that, when processing the control program, executes the steps of the early warning method for engine oil emulsification according to any one of claims 1-8.

10. A vehicle, characterized in that, Includes the vehicle controller according to claim 9.

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