Engine lubricating oil monitoring method, device, monitoring system and vehicle

Abstract

The present application provides an engine lubricating oil monitoring method, device, monitoring system and vehicle. In this solution, by obtaining first operating parameters such as the engine speed and the engine water outlet temperature, and then obtaining the second operating parameters of the engine's lubrication system when the engine is operating in a specified working condition. Among them, the second operating parameter includes a first pressure value of the lubricating oil near the oil pump end in the lubrication system and a second pressure value of the lubricating oil far from the oil pump end. Since the degradation rate of the lubricating oil is associated with the first pressure value and the second pressure value, the detection result of the lubricating oil can be determined according to the second operating parameter and the preset algorithm. The detection result includes the degradation rate of the lubricating oil. In this way, automatic detection of degradation can be achieved. The use of the first pressure value at the proximal end of the oil pump and the second pressure value at the distal end is conducive to improving the accuracy of detection.

Description

Technical Field

[0001] The present invention relates to the technical field of engine lubricating oil, and in particular to an engine lubricating oil monitoring method, device, monitoring system and vehicle. Background Art

[0002] Lubricating oil has the functions of lubrication, cleaning, cooling, sealing, and rust prevention. It can be used in engines to ensure that all engine parts can operate normally. During the operation of the engine, some unburned fuel, water produced by fuel combustion and other substances will mix into the lubricating oil and gradually accumulate. When the amount of the above substances accumulated in the lubricating oil reaches a certain level, it will cause the engine lubricating oil to increase. If the lubricating oil increases seriously, it will not only reduce the performance parameters of the lubricating oil such as viscosity, but also cause abnormal wear of the main moving parts of the engine, resulting in the engine being unable to operate normally. Moreover, because a large amount of unburned fuel is mixed in the lubricating oil, there is a risk of explosion in a high-temperature working environment. The speed at which the engine lubricating oil increases is related to the environment and road conditions in which the car is running. For example, in winter in the north, because the ambient temperature is very low and the temperature of the engine body is low, the water produced by fuel combustion and the unburned fuel are more likely to condense into the engine and mix with the lubricating oil. Therefore, car owners usually need to replace the engine lubricating oil regularly.

[0003] Depending on the environment and road conditions in which the car is operated for a long time, the following two situations may occur. One situation is that the amount of engine lubricant oil has increased too much before the maintenance time, and the performance parameters of the lubricant oil such as viscosity have seriously decreased. The main moving parts of the engine have already worn out, affecting the service life of the engine, and even the car has safety hazards. Although the engine is equipped with an oil dipstick to facilitate car users to observe the increase and decrease of lubricant oil, in fact, few users will take the initiative to use the oil dipstick to determine whether the lubricant oil needs to be replaced. The other situation is that the maintenance time has arrived, but the engine lubricant oil deterioration rate is very small, and it can actually continue to be used. In this case, replacing the engine lubricant oil will not only waste social resources, but also increase the cost of use for car users. Therefore, it is currently impossible to automatically detect the deterioration of engine lubricant oil. Summary of the invention

[0004] In view of this, an object of the embodiments of the present application is to provide an engine lubricating oil monitoring method, device, monitoring system and vehicle, which can realize automatic detection of engine lubricating oil deterioration.

[0005] In order to achieve the above technical objectives, the technical solutions adopted in this application are as follows:

[0006] In a first aspect, an embodiment of the present application provides an engine lubricating oil monitoring method, the method comprising:

[0007] Acquire a first operating parameter of the engine, the first operating parameter comprising a rotation speed of the engine and a water outlet temperature of the engine;

[0008] When the first operating parameter indicates that the engine is operating in a specified operating condition, obtaining a second operating parameter of a lubrication system of the engine, wherein the second operating parameter includes a first pressure value of lubrication oil near an oil pump end in the lubrication system and a second pressure value of the lubrication oil far from the oil pump end;

[0009] According to the second operating parameter and a preset algorithm, a detection result of the lubricating oil is determined, and the detection result includes a degradation rate of the lubricating oil.

[0010] In combination with the first aspect, in some optional implementations, determining the detection result of the lubricating oil according to the second operating parameter and a preset algorithm includes:

[0011] According to a pre-stored first correspondence between the pressure difference and the viscosity of the lubricating oil, determining the viscosity corresponding to the current pressure difference between the first pressure value and the second pressure value as the current viscosity of the lubricating oil;

[0012] The ratio of the current viscosity to the preset viscosity of the lubricating oil is used to determine the degradation rate of the lubricating oil and obtain the detection result.

[0013] In combination with the first aspect, in some optional implementations, determining, according to a first correspondence between a pre-stored pressure difference and the viscosity of the lubricating oil, a viscosity corresponding to a current pressure difference between the first pressure value and the second pressure value as the current viscosity of the lubricating oil includes:

[0014] According to a second correspondence between the pre-stored engine type, lubricant type, pressure difference and the viscosity of the lubricant, the viscosity corresponding to the current pressure difference between the engine type, the lubricant type, the first pressure value and the second pressure value is determined as the current viscosity of the lubricant.

[0015] In combination with the first aspect, in some optional implementations, before obtaining the first operating parameter of the engine, the method further includes:

[0016] Acquire multiple groups of test pressure difference values ​​when the engine reaches the specified working condition at different time periods, and the viscosity of the lubricating oil at each group of the test pressure difference values, wherein each group of the test pressure difference values ​​is the pressure difference value of the lubricating oil close to the oil pump end and far from the oil pump end;

[0017] The first corresponding relationship between the pressure difference and the viscosity of the lubricating oil is established based on the multiple groups of test pressure difference values ​​and the viscosity of the lubricating oil at each group of the test pressure difference values.

[0018] In combination with the first aspect, in some optional embodiments, the second operating parameter further includes a current pressure buildup duration of the lubrication system, and the current pressure buildup duration is a duration from when the lubrication oil in the lubrication system away from the oil pump end reaches a specified pressure when the engine is started;

[0019] Determining the detection result of the lubricating oil according to the second operating parameter and the preset algorithm includes:

[0020] According to a third correspondence between the pre-stored pressure building time difference and the viscosity of the lubricating oil, determining the viscosity corresponding to the time difference between the current pressure building time and the preset pressure building time as the current viscosity of the lubricating oil;

[0021] The ratio of the current viscosity to the preset viscosity of the lubricating oil is used to determine the degradation rate of the lubricating oil and obtain the detection result.

[0022] In combination with the first aspect, in some optional implementations, determining the viscosity corresponding to the time difference between the current pressure building time and the preset pressure building time as the current viscosity of the lubricating oil according to a third corresponding relationship between the pre-stored pressure building time difference and the viscosity of the lubricating oil includes:

[0023] According to the fourth correspondence between the pre-stored engine type, lubricant type, pressure buildup time difference and the viscosity of the lubricant, the viscosity corresponding to the engine type, the lubricant type, the time difference between the current pressure buildup time and the preset pressure buildup time is determined as the current viscosity of the lubricant.

[0024] In combination with the first aspect, in some optional implementations, before obtaining the first operating parameter of the engine, the method further includes:

[0025] Obtaining multiple groups of test pressure-building time differences when the engine reaches the specified working condition at different time periods, and the viscosity of the lubricating oil at each group of the test pressure-building time differences, wherein each group of the test pressure-building time differences is the time difference between the first time when the lubricating oil away from the oil pump end reaches the specified pressure when the engine is started and the preset pressure-building time;

[0026] According to the multiple groups of test pressure building time differences and the viscosity of the lubricating oil during each group of the test pressure building time differences, the third corresponding relationship between the pressure building time difference and the viscosity of the lubricating oil is established.

[0027] In combination with the first aspect, in some optional implementations, the method further includes:

[0028] When the degradation rate exceeds a preset threshold, and the duration of exceeding the preset threshold exceeds a specified duration, an alarm is issued.

[0029] In a second aspect, an embodiment of the present application further provides an engine lubricating oil monitoring device, the device comprising:

[0030] a first acquisition unit, configured to acquire a first operating parameter of the engine, wherein the first operating parameter includes a rotation speed of the engine and a water outlet temperature of the engine;

[0031] a second acquisition unit, configured to acquire a second operating parameter of a lubrication system of the engine when the first operating parameter indicates that the engine is operating in a specified operating condition, the second operating parameter comprising a first pressure value of the lubrication oil near an oil pump end in the lubrication system and a second pressure value of the lubrication oil far from the oil pump end;

[0032] A detection unit is used to determine a detection result of the lubricating oil according to the second operating parameter and a preset algorithm, wherein the detection result includes a degradation rate of the lubricating oil.

[0033] In a third aspect, an embodiment of the present application further provides a monitoring system, comprising: a processor and a memory coupled to each other, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the monitoring system executes the above method.

[0034] In combination with the third aspect, in some optional embodiments, the monitoring system also includes a first pressure sensor for being arranged near the oil pump end in the lubrication system and a second pressure sensor away from the oil pump end, and the first pressure sensor and the second pressure sensor are both electrically connected to the processor.

[0035] In a fourth aspect, an embodiment of the present application further provides a vehicle, comprising a vehicle body and the above-mentioned monitoring system, wherein the monitoring system is arranged on the vehicle body.

[0036] In a fifth aspect, an embodiment of the present application further provides a computer-readable storage medium, in which a computer program is stored. When the computer program runs on a computer, the computer executes the above method.

[0037] The invention adopting the above technical solution has the following advantages:

[0038] In the technical solution provided in the present application, the method obtains first operating parameters such as the engine speed and the engine outlet water temperature, and then obtains the second operating parameters of the engine's lubrication system when the engine is operating in a specified working condition. The second operating parameter includes a first pressure value of the lubricating oil near the oil pump end in the lubrication system and a second pressure value of the lubricating oil far from the oil pump end. Since the degradation rate of the lubricating oil is associated with the first pressure value and the second pressure value, the detection result of the lubricating oil can be determined according to the second operating parameter and the preset algorithm. The detection result includes the degradation rate of the lubricating oil. In this way, automatic detection of degradation can be achieved. The use of the first pressure value at the proximal end of the oil pump and the second pressure value at the distal end is conducive to improving the accuracy of detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The present application may be further described by the non-limiting embodiments given in the accompanying drawings. It should be understood that the following drawings only illustrate certain embodiments of the present application and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings may be obtained based on these drawings without creative effort.

[0040] Figure 1 A schematic diagram of the circuit modules of the monitoring system provided in an embodiment of the present application.

[0041] Figure 2 A schematic diagram of the structure of the lubrication system provided in an embodiment of the present application.

[0042] Figure 3 A flow chart of an engine lubricating oil monitoring method provided in an embodiment of the present application.

[0043] Figure 4 A block diagram of an engine lubricating oil monitoring device provided in an embodiment of the present application.

[0044] Icons: 10 - monitoring system; 11 - processing module; 12 - storage module; 13 - first pressure sensor; 14 - second pressure sensor; 200 - engine lubricating oil monitoring device; 210 - first acquisition unit; 220 - second acquisition unit; 230 - detection unit. DETAILED DESCRIPTION

[0045] The present application will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that in the drawings or descriptions, similar or identical parts use the same figure numbers, and the implementation methods not shown or described in the drawings are forms known to ordinary technicians in the relevant technical field. In the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0046] First embodiment

[0047] Please refer to Figure 1 The embodiment of the present application provides a monitoring system 10. The monitoring system 10 includes a processing module 11 and a storage module 12. The storage module 12 stores a computer program. When the computer program is executed by the processing module 11, the monitoring system 10 can perform the corresponding steps in the following engine lubricating oil monitoring method.

[0048] The monitoring system 10 may further include a first pressure sensor 13 and a second pressure sensor 14. Figure 2 The first pressure sensor 13 can be arranged at one end of the lubrication system close to the oil pump, and is used to detect the pressure value of the lubricating oil near the oil pump. The second pressure sensor 14 can be arranged at one end far from the oil pump, and is used to detect the pressure value of the lubricating oil far from the oil pump. The first pressure sensor 13 and the second pressure sensor 14 are both connected to the processing module 11, and are used to send the collected pressure data to the processing module 11 for analysis and processing.

[0049] In this embodiment, the lubricating oil can also be called engine oil. In the lubrication system, conventional structures such as an oil pan, an oil pump, an oil filter, a crankcase lubricating main oil passage, a cylinder head lubricating main oil passage, and a VVT (Variable Valve Timing) control oil passage can be included. The oil pump can pump the lubricating oil in the oil pan through the oil filter to the crankcase lubricating main oil passage and the cylinder head lubricating main oil passage to lubricate the corresponding structures on the vehicle. Among them, the oil filter can filter the pumped lubricating oil.

[0050] The lubricating oil in the crankcase lubrication main oil channel can lubricate the crankshaft shaft diameter, the connecting rod shaft diameter, the PCJ bearing, and the timing chain. The lubricating oil in the cylinder head lubrication main oil channel can lubricate the camshaft journal. Among them, the PCJ bearing is a type of bearing. The functions of the lubrication system are well known to those skilled in the art and will not be described here.

[0051] It should be noted that the first pressure sensor 13 can be set in the pipeline between the oil pump and the oil filter to detect the pressure value of the lubricating oil near the oil pump. The second pressure sensor 14 needs to be set as far away from the oil pump as possible. For example, the second pressure sensor 14 can be set in the pipeline between the cylinder head lubricating oil main oil channel and the VVT ​​control oil channel to detect the pressure value of the lubricating oil far from the oil pump.

[0052] Second embodiment

[0053] Please refer to Figure 3 The present application also provides an engine lubricating oil monitoring method, which can be applied to the above-mentioned monitoring system 10, and each step of the method is executed or implemented by the monitoring system 10. Among them, the engine lubricating oil monitoring method can include the following steps:

[0054] Step 110, obtaining a first operating parameter of the engine, wherein the first operating parameter includes a rotation speed of the engine and a water outlet temperature of the engine;

[0055] Step 120, when the first operating parameter indicates that the engine is operating in a specified operating condition, obtaining a second operating parameter of a lubrication system of the engine, wherein the second operating parameter includes a first pressure value of the lubrication oil near an oil pump end in the lubrication system and a second pressure value of the lubrication oil far from the oil pump end;

[0056] Step 130: Determine a detection result of the lubricating oil according to the second operating parameter and a preset algorithm, wherein the detection result includes a degradation rate of the lubricating oil.

[0057] The following will describe in detail the various steps of the engine lubricating oil monitoring method, as follows:

[0058] In step 110, the processing module can obtain the first operating parameter of the engine. The first operating parameter includes but is not limited to the engine speed and the engine water outlet temperature. The processing module obtains the first operating parameter in a conventional manner and will not be described in detail here.

[0059] In step 120, if the engine is running in a specified operating condition, the processing module can obtain a second operating parameter of the lubrication system. For example, the processing module can obtain corresponding pressure values ​​from the first pressure sensor and the second pressure sensor as the second operating parameter.

[0060] It should be noted that the lubrication system can lubricate the corresponding structure of the engine. The second operating parameter may include but is not limited to the pressure value collected by the first pressure sensor (i.e., the first pressure value) and the pressure value collected by the second pressure sensor (i.e., the second pressure value). The first pressure value is the pressure value of the lubricating oil near the oil pump end in the lubrication system, and the second pressure value is the pressure value far from the oil pump end.

[0061] The operating parameters of the engine corresponding to the specified working condition can be flexibly determined according to the actual situation. For example, the specified working condition may refer to the working condition when the engine speed is 2000r / min and the outlet water temperature is 98°C. The outlet water temperature refers to the water temperature at the outlet of the engine cooling circuit.

[0062] In step 130, the preset algorithm can be flexibly determined according to the actual situation. In the test results, the degradation rate can be used to characterize the performance of the current lubricant. The larger the degradation rate, the worse the performance of the lubricant. If the degradation rate exceeds the preset threshold, it means that the lubricant is abnormal. If the current lubricant is abnormal, it means that the current lubricant needs to be replaced. If the current lubricant is normal, it can continue to be used. Among them, the preset threshold can be flexibly set according to the actual situation, and is not specifically limited here.

[0063] In this embodiment, the processing module can calculate the degradation rate of the lubricating oil based on the pressure difference between the first pressure value and the second pressure value; or, the processing module can calculate the degradation rate of the lubricating oil based on the pressure building time of the second pressure sensor and the preset pressure building time.

[0064] As an optional implementation, step 130 may include:

[0065] According to a pre-stored first correspondence between the pressure difference and the viscosity of the lubricating oil, determining the viscosity corresponding to the current pressure difference between the first pressure value and the second pressure value as the current viscosity of the lubricating oil;

[0066] The ratio of the current viscosity to the preset viscosity of the lubricating oil is used to determine the degradation rate of the lubricating oil and obtain the detection result.

[0067] It is understandable that in the lubrication system, the difference between the first pressure value and the second pressure value has a mapping relationship with the viscosity of the lubricating oil, and different pressure differences usually correspond to different viscosities. The first corresponding relationship can be pre-stored in the storage module. In this way, the processing module can determine the current viscosity of the lubricating oil based on the current pressure difference and the first corresponding relationship. Among them, the first corresponding relationship can be regarded as a mapping function, that is, one pressure difference corresponds to one viscosity value, and the pressure difference and viscosity can be mapped one by one.

[0068] Then, the processing module can calculate the ratio of the previous viscosity to the preset viscosity of the lubricating oil, and the ratio is the degradation rate of the lubricating oil. The preset viscosity refers to the viscosity of the new lubricating oil just used in the lubricating system.

[0069] In this embodiment, according to a first correspondence between a pre-stored pressure difference and the viscosity of the lubricating oil, determining the viscosity corresponding to the current pressure difference between the first pressure value and the second pressure value as the current viscosity of the lubricating oil includes:

[0070] According to a second correspondence between the pre-stored engine type, lubricant type, pressure difference and the viscosity of the lubricant, the viscosity corresponding to the current pressure difference between the engine type, the lubricant type, the first pressure value and the second pressure value is determined as the current viscosity of the lubricant.

[0071] Understandably, the corresponding relationship between the pressure difference and the viscosity of the lubricating oil corresponding to different engine types and different lubricating oil types is usually different. In addition, the preset viscosity corresponding to different engine types and different lubricating oil types is also different.

[0072] In the storage module, the correspondence between the pressure difference and the viscosity of the lubricating oil in the case of various engine types and different lubricating oil types can be pre-stored. The processing module can index the second correspondence that matches the current engine type and the current lubricating oil type based on the current engine type and the current lubricating oil type as the correspondence between the current pressure difference and the viscosity of the lubricating oil. Then, the second correspondence, the current pressure difference between the first pressure value and the second pressure value, is used to determine the viscosity of the lubricating oil at this time as the current viscosity. Since the engine type and the type of lubricating oil are taken into consideration during the calculation process, the accuracy of the viscosity calculation can be improved, which is conducive to improving the accuracy of the degradation rate calculation.

[0073] As an optional implementation, before step 110, the method may further include:

[0074] Acquire multiple groups of test pressure difference values ​​when the engine reaches the specified working condition at different time periods, and the viscosity of the lubricating oil at each group of the test pressure difference values, wherein each group of the test pressure difference values ​​is the pressure difference value of the lubricating oil close to the oil pump end and far from the oil pump end;

[0075] The first corresponding relationship between the pressure difference and the viscosity of the lubricating oil is established based on the multiple groups of test pressure difference values ​​and the viscosity of the lubricating oil at each group of the test pressure difference values.

[0076] In this embodiment, during the research and development test phase, for the same type of lubricant and multiple engines of the same type, multiple groups of test pressure difference values ​​and corresponding lubricant viscosity can be collected when each engine reaches the specified working condition at different time periods. Then, a two-dimensional rectangular coordinate system can be constructed, in which the horizontal axis of the two-dimensional coordinate is the pressure difference and the vertical axis can be the viscosity. A pressure difference value corresponds to a viscosity value and can be used as a point in the two-dimensional coordinate. Multiple groups of pressure difference values ​​and viscosities can obtain multiple coordinate points in the two-dimensional coordinate. Then, curve fitting is performed on multiple points, and the fitted curve can be used as a mapping function, which is the first corresponding relationship. The first corresponding relationship can be stored in the storage module so that the processing module can determine the viscosity of the lubricant based on the first corresponding relationship.

[0077] In addition, according to the needs, the R&D personnel can fit the corresponding mapping functions for various permutations and combinations of commonly used engine models and commonly used lubricants. The mapping function can be used as the second corresponding relationship, and each mapping function is associated with the signal of the engine and the model of the lubricant. The second corresponding relationship can be stored in the storage module. Compared with the first corresponding relationship, the degradation rate can be calculated for differentiated engines and lubricants in the second corresponding relationship, which is conducive to improving the accuracy of the degradation rate detection for different models of engines and different models of lubricants.

[0078] As an optional implementation, the method may further include: when the degradation rate exceeds a preset threshold, and the duration of exceeding the preset threshold exceeds a specified duration, issuing an alarm.

[0079] Both the preset threshold and the specified duration can be flexibly determined according to actual conditions. When the degradation rate exceeds the preset threshold and the duration of exceeding the preset threshold exceeds the specified duration, an alarm prompt is issued, which can improve the effectiveness of the prompt and avoid false alarms due to a single inspection where the degradation rate exceeds the preset threshold. In addition, after the alarm prompt is issued, the owner can promptly find the cause of the alarm and replace the lubricant.

[0080] Third embodiment

[0081] In the third embodiment, the provided engine lubricating oil monitoring method is similar to that of the second embodiment, except that the second operating parameter in step 120 is different, and the implementation method of step 130 is different.

[0082] In a third embodiment, the second operating parameter also includes the current pressure buildup time of the lubrication system, and the current pressure buildup time is: the time from when the lubrication oil in the lubrication system away from the oil pump end reaches the specified pressure when the engine is started. Step 130 may include:

[0083] According to a third correspondence between the pre-stored pressure building time difference and the viscosity of the lubricating oil, determining the viscosity corresponding to the time difference between the current pressure building time and the preset pressure building time as the current viscosity of the lubricating oil;

[0084] The ratio of the current viscosity to the preset viscosity of the lubricating oil is used to determine the degradation rate of the lubricating oil and obtain the detection result.

[0085] The inventors have found that there is a mapping relationship between the time difference between the current pressure building time and the preset pressure building time, and the viscosity of the lubricating oil, and different time differences correspond to different viscosities. In a third embodiment, the storage module pre-stores the corresponding relationship between the pressure building time difference and the viscosity of the lubricating oil as a third corresponding relationship. In this way, in actual application, when calculating the viscosity of the lubricating oil, the viscosity corresponding to the time difference can be determined based on the third corresponding relationship. It can be understood that the third corresponding relationship is similar to the first corresponding relationship, except that the first corresponding relationship refers to the mapping relationship between the pressure difference and the viscosity, while the third corresponding relationship refers to the mapping relationship between the time difference and the viscosity.

[0086] The preset pressure build-up time can be flexibly determined according to actual conditions. The preset pressure build-up time refers to the time from when the engine is started to when the second pressure sensor far from the oil pump end detects that the pressure reaches the specified pressure when new lubricating oil is just replaced in the lubrication system.

[0087] In a third embodiment, according to a third corresponding relationship between the pre-stored pressure building time difference and the viscosity of the lubricating oil, determining the viscosity corresponding to the time difference between the current pressure building time and the preset pressure building time as the current viscosity of the lubricating oil includes:

[0088] According to the fourth correspondence between the pre-stored engine type, lubricant type, pressure buildup time difference and the viscosity of the lubricant, the viscosity corresponding to the engine type, the lubricant type, the time difference between the current pressure buildup time and the preset pressure buildup time is determined as the current viscosity of the lubricant.

[0089] Understandably, the corresponding relationship between the time difference (the difference between the current pressure build-up time and the preset pressure build-up time) and the viscosity of the lubricant is usually different for different engine types and different lubricant types. In addition, the preset viscosity and preset pressure build-up time are also different for different engine types and different lubricant types.

[0090] In the storage module, the correspondence between the pressure difference and the viscosity of the lubricating oil, as well as the corresponding preset viscosity and preset pressure building time under various engine types and different lubricating oil types can be pre-stored. The processing module can index the third correspondence that matches the current engine type and the current lubricating oil type based on the current engine type and the current lubricating oil type as the correspondence between the current time difference and the viscosity of the lubricating oil. Then, the third correspondence, the time difference between the current pressure building time and the preset pressure building time, is used to determine the viscosity of the lubricating oil at this time as the current viscosity. Since the engine type and the type of lubricating oil are taken into consideration during the calculation process, the accuracy of the viscosity calculation can be improved, which in turn helps to improve the accuracy of the degradation rate calculation.

[0091] In the third embodiment, before step 110, the method may further include:

[0092] Obtaining multiple groups of test pressure-building time differences when the engine reaches the specified working condition at different time periods, and the viscosity of the lubricating oil at each group of the test pressure-building time differences, wherein each group of the test pressure-building time differences is the time difference between the first time when the lubricating oil away from the oil pump end reaches the specified pressure when the engine is started and the preset pressure-building time;

[0093] According to the multiple groups of test pressure building time differences and the viscosity of the lubricating oil during each group of the test pressure building time differences, the third corresponding relationship between the pressure building time difference and the viscosity of the lubricating oil is established.

[0094] In a third embodiment, during the research and development test phase, for the same type of lubricant and multiple engines of the same type, multiple groups of test pressure build-up time differences and corresponding lubricant viscosity can be collected when each engine reaches the specified working condition at different time periods. Then, a two-dimensional rectangular coordinate system can be constructed, in which the horizontal axis of the two-dimensional coordinate is the test pressure build-up time difference, and the vertical axis can be the viscosity. A test pressure build-up time difference corresponds to a viscosity value, which can be used as a point in the two-dimensional coordinate. Multiple groups of test pressure build-up time differences and viscosities can obtain multiple coordinate points in the two-dimensional coordinate. Then, curve fitting is performed on multiple points, and the fitted curve can be used as a mapping function, which is the third corresponding relationship. The third corresponding relationship can be stored in the storage module so that the processing module can determine the viscosity of the lubricant based on the third corresponding relationship.

[0095] In addition, R&D personnel can, as needed, fit corresponding mapping functions to various permutations and combinations of commonly used engine models and commonly used lubricants based on the test pressure buildup time difference and viscosity, as the fourth corresponding relationship. In this way, differentiated viscosity detection can be performed on different engine models and different lubricants to improve the accuracy of degradation rate calculation.

[0096] The following is an example of how to implement engine lubricating oil monitoring:

[0097] Step 1, obtaining the operating parameters of the engine and the operating parameters of the lubrication system;

[0098] The operating parameters of the above engine include boundary parameters for determining and calculating the engine lubricating oil degradation rate, such as engine speed (n, r / min), engine outlet water temperature (T OUT , ℃). In order to monitor the deterioration rate of the current engine lubricant in real time, the engine speed and the outlet water temperature under the common engine working conditions can be selected as the boundary conditions for calculating the deterioration rate of the engine lubricant. For example, the boundary conditions can be: the engine speed is 2000r / min; the engine outlet water temperature is 98℃.

[0099] The operating parameters of the lubrication system include the main parameters used to calculate the engine lubricant deterioration rate, such as the oil pressure (P near , Bar), the oil pressure in the oil circuit away from the oil pump end (P far , Bar) and the oil pressure build-up time away from the oil pump end (T setup-now , s). That is, P near Refers to the first pressure value, P far Refers to the second pressure value.

[0100] Step 2, calculating the current engine lubricating oil viscosity according to the operating parameters of the engine and the operating parameters of the lubrication system;

[0101] When the engine runs to the specified working condition (for example, the engine speed is 2000r / min; the engine outlet water temperature is 98℃), the remote oil pressure build-up time (T setup-now , s), to calculate the current viscosity (V now , mm 2 / s). Among them, the remote oil pressure build-up time (T setup-now , s), relative to the preset pressure build-up time (T0, s) of the remote end of the engine after the new lubricant has just been replaced (ΔT, s), the calculation formula is: ΔT = T setup-now -T0.

[0102] The current viscosity of the above oil (V now , mm 2 / s) is calculated as: V now =f(ΔT). This calculation formula is obtained by fitting the difference between the measured engine remote oil pressure build-up time and the preset pressure build-up time under multiple groups of different engine lubricating oil viscosities, that is, the current viscosity V can be calculated through the third corresponding relationship mentioned above. now .

[0103] The preset pressure build-up time (T0, s) of the remote oil pressure of a new engine or an engine just after the lubricant has been replaced is calculated based on the specified lubricant grade through finite element analysis and actual measurement data. In order to accurately calculate the current viscosity (V now , mm 2 / s), a new engine or an engine that has just changed its lubricating oil will start to run for a period of time according to the near-end oil pressure (P near , Bar), remote oil pressure (P far , Bar) and remote oil pressure build-up time (T setup-now , s), and correct the preset pressure build-up time (T0, s) of the remote oil pressure.

[0104] Step 3: Calculate the lubricating oil degradation rate according to the calculated current viscosity of the engine lubricating oil;

[0105] The engine lubricant oil degradation rate (δ) is calculated by the current viscosity (V now , mm 2 / s) and the preset viscosity of the lubricating oil (V initial , mm 2 / s) is calculated, and the calculation formula is: δ=V now / V inital .

[0106] The above preset viscosity V initial , is the performance index provided by the specified brand of lubricant selected for the engine in this example. In order to avoid the influence of engine hardware differences and different brands of lubricants on the current engine lubricant viscosity, the current engine oil viscosity (V now , mm 2 / s), a new engine or an engine that has just changed its lubricating oil will start to run for a period of time according to the near-end oil pressure (P near , Bar), remote oil pressure (P far , Bar) and the remote oil pressure build-up time (T setup-now , s), for the preset viscosity V initial ) for correction.

[0107] Step 4: Based on the calculated current engine lubricant oil degradation rate, evaluate whether the engine lubricant oil viscosity and other performance parameters meet the anti-wear requirements of the main moving parts of the engine. That is, whether the degradation rate exceeds the preset threshold. If the degradation rate exceeds the preset threshold, it means that the lubricant oil cannot meet the requirements, and an alarm will be sounded to remind the owner to replace the engine lubricant oil.

[0108] Among them, step 2 can adopt another method to calculate the current viscosity of the lubricating oil.

[0109] For example, when the engine is running at a specified operating condition, the engine oil pressure near the engine (P near , Bar) and remote oil pressure (P far , Bar), calculate the current viscosity V of the engine lubricating oil now The specified operating condition may refer to the operating condition when the engine speed is 2000r / min and the engine outlet water temperature is 98°C.

[0110] Among them, the proximal oil pressure (P near , Bar) and remote oil pressure (P far The calculation formula of the difference (ΔP, Bar) is: ΔP = P near –P far .

[0111] Current viscosity V of the engine oil now The calculation formula is: V now =f(ΔP). This calculation formula is obtained by fitting the difference between the measured near-end oil pressure and the far-end oil pressure of the engine under multiple sets of different viscosities of the engine lubricating oil. That is, through the above-mentioned first corresponding relationship, the current viscosity V can be calculated. now .

[0112] Fourth embodiment

[0113] Please refer to Figure 4 The present application also provides an engine lubricating oil monitoring device 200, which includes at least one software function module that can be stored in a storage module or fixed in an operating system (OS) in the form of software or firmware. The processing module is used to execute the executable module stored in the storage module, such as the software function module and computer program included in the engine lubricating oil monitoring device 200.

[0114] The engine lubricating oil monitoring device 200 includes a first acquisition unit 210, a second acquisition unit 220 and a detection unit 230, and the functions of each unit may be as follows:

[0115] A first acquisition unit 210 is used to acquire a first operating parameter of the engine, wherein the first operating parameter includes a rotation speed of the engine and a water outlet temperature of the engine;

[0116] a second acquisition unit 220, configured to acquire a second operating parameter of a lubrication system of the engine when the first operating parameter indicates that the engine is operating in a specified operating condition, the second operating parameter comprising a first pressure value of the lubrication oil near an oil pump end in the lubrication system and a second pressure value of the lubrication oil far from the oil pump end;

[0117] The detection unit 230 is used to determine the detection result of the lubricating oil according to the second operating parameter and a preset algorithm, and the detection result includes the degradation rate of the lubricating oil.

[0118] Optionally, the detection unit 230 can also be used to: determine the viscosity corresponding to the current pressure difference between the first pressure value and the second pressure value as the current viscosity of the lubricating oil based on a first corresponding relationship between the pre-stored pressure difference and the viscosity of the lubricating oil; determine the degradation rate of the lubricating oil by the ratio of the current viscosity to the preset viscosity of the lubricating oil, and obtain the detection result.

[0119] Optionally, the detection unit 230 can also be used to determine the viscosity corresponding to the current pressure difference between the engine type, the lubricant type, the first pressure value and the second pressure value based on a second correspondence between the pre-stored engine type, the lubricant type, the pressure difference and the viscosity of the lubricant, as the current viscosity of the lubricant.

[0120] Optionally, the engine lubricating oil monitoring device 200 may also include a third acquisition unit and a creation unit. Before acquiring the first operating parameter of the engine, the third acquisition unit is used to acquire multiple groups of test pressure difference values ​​when the engine reaches the specified working condition at different time periods, and the viscosity of the lubricating oil at each group of the test pressure difference values, each group of the test pressure difference values ​​being the pressure difference value of the lubricating oil close to the oil pump end and away from the oil pump end; the creation unit is used to create the first corresponding relationship between the pressure difference value and the viscosity of the lubricating oil according to the multiple groups of test pressure difference values ​​and the viscosity of the lubricating oil at each group of the test pressure difference values.

[0121] Optionally, the second operating parameter also includes the current pressure building time of the lubrication system, and the current pressure building time is the time from when the engine starts and when the pressure of the lubricating oil in the lubrication system away from the oil pump end reaches a specified pressure; the detection unit 230 can also be used to: determine the viscosity corresponding to the time difference between the current pressure building time and the preset pressure building time according to a third corresponding relationship between the pre-stored pressure building time difference and the viscosity of the lubricating oil, as the current viscosity of the lubricating oil; determine the degradation rate of the lubricating oil by the ratio of the current viscosity to the preset viscosity of the lubricating oil, and obtain the detection result.

[0122] Optionally, the detection unit 230 can also be used to determine the viscosity corresponding to the type of the engine, the type of the lubricant, the time difference between the current pressure building time and the preset pressure building time as the current viscosity of the lubricant based on a fourth correspondence between the pre-stored engine type, the lubricant type, the pressure building time difference and the viscosity of the lubricant.

[0123] Optionally, the engine lubricating oil monitoring device 200 may also include a fourth acquisition unit and a creation unit. Before acquiring the first operating parameter of the engine, the fourth acquisition unit is used to acquire multiple groups of test pressure build-up time differences when the engine reaches the specified working condition at different time periods, and the viscosity of the lubricating oil at each group of the test pressure build-up time differences, each group of the test pressure build-up time differences being the time difference between the first time when the lubricating oil away from the oil pump end reaches the specified pressure when the engine is started and the preset pressure build-up time; the creation unit may be used to create the third corresponding relationship between the pressure build-up time difference and the viscosity of the lubricating oil according to the multiple groups of test pressure build-up time differences and the viscosity of the lubricating oil at each group of the test pressure build-up time differences.

[0124] Optionally, the engine lubricating oil monitoring device 200 may further include a prompting unit. The prompting unit is used to issue an alarm when the degradation rate exceeds a preset threshold and the duration of exceeding the preset threshold exceeds a specified duration.

[0125] In this embodiment, the processing module can be an integrated circuit chip with signal processing capabilities. The above-mentioned processing module can be a general-purpose processor or an electronic control unit (Electronic Control Unit, ECU). For example, the processor can be a central processing unit (CPU), a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, and can implement or execute the disclosed methods, steps and logic block diagrams in the embodiments of this application.

[0126] The storage module may be, but is not limited to, a random access memory, a read-only memory, a programmable read-only memory, an erasable programmable read-only memory, an electrically erasable programmable read-only memory, etc. In this embodiment, the storage module may be used to store the first operating parameter, the second operating parameter, the preset algorithm and the corresponding relationship, etc. Of course, the storage module may also be used to store a program, and the processing module executes the program after receiving the execution instruction.

[0127] Understandably, Figure 1 The monitoring system structure shown in FIG. is only a schematic diagram of the structure. The monitoring system may also include Figure 1 More components are shown. Figure 1 Each component shown in the figure can be implemented by hardware, software or a combination thereof.

[0128] It should be noted that technicians in the relevant field can clearly understand that for the convenience and simplicity of description, the specific working process of the monitoring system described above can refer to the corresponding process of each step in the aforementioned method, and will not be elaborated here.

[0129] The embodiment of the present application also provides a vehicle, including a vehicle body and the monitoring system in the above embodiment. The monitoring system is deployed on the vehicle body. The monitoring system can detect the lubricating oil in the lubrication system of the vehicle engine and can automatically determine the deterioration rate of the lubricating oil, thereby facilitating the vehicle owner to replace the lubricating oil in a timely manner.

[0130] The embodiment of the present application further provides a computer-readable storage medium. The computer-readable storage medium stores a computer program, and when the computer program is run on a computer, the computer executes the engine lubricating oil monitoring method described in the above embodiment.

[0131] Through the description of the above implementation methods, technical personnel in this field can clearly understand that the present application can be implemented through hardware, and can also be implemented by means of software plus a necessary general hardware platform. Based on such an understanding, the technical solution of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), including a number of instructions for enabling a computer device (which can be a personal computer, a monitoring system, or a network device, etc.) to execute the methods described in each implementation scenario of the present application.

[0132] In summary, the embodiments of the present application provide an engine lubricating oil monitoring method, device, monitoring system and vehicle. In this solution, by obtaining first operating parameters such as the engine speed and the engine water outlet temperature, and then obtaining the second operating parameters of the engine's lubrication system when the engine is operating in a specified working condition. Among them, the second operating parameter includes a first pressure value of the lubricating oil near the oil pump end in the lubrication system and a second pressure value of the lubricating oil far from the oil pump end. Since the degradation rate of the lubricating oil is associated with the first pressure value and the second pressure value, the detection result of the lubricating oil can be determined according to the second operating parameter and the preset algorithm. The detection result includes the degradation rate of the lubricating oil. In this way, automatic detection of degradation can be achieved. The use of the first pressure value at the proximal end of the oil pump and the second pressure value at the distal end is conducive to improving the accuracy of detection.

[0133] In the embodiments provided in the present application, it should be understood that the disclosed device, system and method can also be implemented in other ways. The above-described device, system and method embodiments are merely schematic, for example, the flowchart and block diagram in the accompanying drawings show the possible architecture, function and operation of the system, method and computer program product according to the multiple embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a part of a module, a program segment or a code, and a part of the module, program segment or code contains one or more executable instructions for implementing the specified logical function. It should also be noted that each box in the block diagram and / or the flowchart, and the combination of the boxes in the block diagram and / or the flowchart can be implemented by a dedicated hardware-based system that performs the specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions. In addition, each functional module in each embodiment of the present application can be integrated together to form an independent part, or each module can exist separately, or two or more modules can be integrated to form an independent part.

[0134] The above description is only an embodiment of the present application and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various modifications and variations. 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 for monitoring engine lubricating oil, characterized in that: The method comprises: Acquire a first operating parameter of the engine, the first operating parameter comprising a rotation speed of the engine and a water outlet temperature of the engine; When the first operating parameter indicates that the engine is operating in a specified operating condition, obtaining a second operating parameter of a lubrication system of the engine, the second operating parameter comprising a first pressure value of lubrication oil near an oil pump end in the lubrication system and a second pressure value of the lubrication oil far from the oil pump end; Determining a detection result of the lubricating oil according to the second operating parameter and a preset algorithm, wherein the detection result includes a deterioration rate of the lubricating oil; Wherein, determining the detection result of the lubricating oil according to the second operating parameter and a preset algorithm includes: According to a pre-stored first correspondence between the pressure difference and the viscosity of the lubricating oil, determining the viscosity corresponding to the current pressure difference between the first pressure value and the second pressure value as the current viscosity of the lubricating oil; Determine the degradation rate of the lubricating oil by taking the ratio of the current viscosity to the preset viscosity of the lubricating oil, and obtain the detection result; The determining, according to a first correspondence between a pre-stored pressure difference and the viscosity of the lubricating oil, a viscosity corresponding to a current pressure difference between the first pressure value and the second pressure value as a current viscosity of the lubricating oil, comprises: According to a pre-stored second correspondence between the engine type, the lubricating oil type, the pressure difference and the viscosity of the lubricating oil, determining the viscosity corresponding to the type of the engine, the type of the lubricating oil, the current pressure difference between the first pressure value and the second pressure value as the current viscosity of the lubricating oil; Alternatively, the second operating parameter also includes the current pressure buildup duration of the lubrication system, and the current pressure buildup duration is the duration from when the lubrication oil in the lubrication system away from the oil pump end reaches a specified pressure when the engine is started; Determining the detection result of the lubricating oil according to the second operating parameter and a preset algorithm includes: According to a third correspondence between the pre-stored pressure building time difference and the viscosity of the lubricating oil, determining the viscosity corresponding to the time difference between the current pressure building time and the preset pressure building time as the current viscosity of the lubricating oil; Determine the degradation rate of the lubricating oil by taking the ratio of the current viscosity to the preset viscosity of the lubricating oil, and obtain the detection result; The determining, based on the third correspondence between the pre-stored pressure building time difference and the viscosity of the lubricating oil, the viscosity corresponding to the time difference between the current pressure building time and the preset pressure building time as the current viscosity of the lubricating oil includes: According to the fourth correspondence between the pre-stored engine type, lubricant type, pressure buildup time difference and the viscosity of the lubricant, the viscosity corresponding to the engine type, the lubricant type, the time difference between the current pressure buildup time and the preset pressure buildup time is determined as the current viscosity of the lubricant.

2. The method according to claim 1, characterized in that Before obtaining the first operating parameter of the engine, the method further includes: Acquire multiple groups of test pressure difference values ​​when the engine reaches the specified working condition at different time periods, and the viscosity of the lubricating oil at each group of the test pressure difference values, wherein each group of the test pressure difference values ​​is the pressure difference value of the lubricating oil close to the oil pump end and far from the oil pump end; The first corresponding relationship between the pressure difference and the viscosity of the lubricating oil is established based on the multiple groups of test pressure difference values ​​and the viscosity of the lubricating oil at each group of the test pressure difference values.

3. The method according to claim 1, characterized in that Before obtaining the first operating parameter of the engine, the method further includes: Obtaining multiple groups of test pressure-building time differences when the engine reaches the specified working condition at different time periods, and the viscosity of the lubricating oil at each group of the test pressure-building time differences, wherein each group of the test pressure-building time differences is the time difference between the first time when the lubricating oil away from the oil pump end reaches the specified pressure when the engine is started and the preset pressure-building time; According to the multiple groups of test pressure building time differences and the viscosity of the lubricating oil during each group of the test pressure building time differences, the third corresponding relationship between the pressure building time difference and the viscosity of the lubricating oil is established.

4. The method according to claim 1, characterized in that: The method further comprises: When the degradation rate exceeds a preset threshold, and the duration of exceeding the preset threshold exceeds a specified duration, an alarm is issued.

5. An engine lubricating oil monitoring device, characterized in that: The device comprises: a first acquisition unit, configured to acquire a first operating parameter of the engine, wherein the first operating parameter includes a rotation speed of the engine and a water outlet temperature of the engine; a second acquisition unit, configured to acquire a second operating parameter of a lubrication system of the engine when the first operating parameter indicates that the engine is operating in a specified operating condition, the second operating parameter comprising a first pressure value of the lubrication oil near an oil pump end in the lubrication system and a second pressure value of the lubrication oil far from the oil pump end; a detection unit, configured to determine a detection result of the lubricating oil according to the second operating parameter and a preset algorithm, wherein the detection result includes a degradation rate of the lubricating oil; The detection unit is further used to: determine the viscosity corresponding to the current pressure difference between the first pressure value and the second pressure value as the current viscosity of the lubricating oil according to a first correspondence between the pre-stored pressure difference and the viscosity of the lubricating oil; determine the deterioration rate of the lubricating oil by the ratio of the current viscosity to the preset viscosity of the lubricating oil, and obtain the detection result; wherein, according to the first correspondence between the pre-stored pressure difference and the viscosity of the lubricating oil, determining the viscosity corresponding to the current pressure difference between the first pressure value and the second pressure value as the current viscosity of the lubricating oil includes: According to a pre-stored second correspondence between the engine type, the lubricating oil type, the pressure difference and the viscosity of the lubricating oil, determining the viscosity corresponding to the type of the engine, the type of the lubricating oil, the current pressure difference between the first pressure value and the second pressure value as the current viscosity of the lubricating oil; Alternatively, the second operating parameter also includes the current pressure buildup time of the lubricating system, the current pressure buildup time being the time from when the engine starts to when the lubricating oil in the lubricating system far from the oil pump end reaches a specified pressure; the detection unit is further used to: determine the viscosity corresponding to the time difference between the current pressure buildup time and the preset pressure buildup time according to a third correspondence between the pre-stored pressure buildup time difference and the viscosity of the lubricating oil, as the current viscosity of the lubricating oil; determine the deterioration rate of the lubricating oil by the ratio of the current viscosity to the preset viscosity of the lubricating oil, and obtain the detection result; wherein, determining the viscosity corresponding to the time difference between the current pressure buildup time and the preset pressure buildup time according to the third correspondence between the pre-stored pressure buildup time difference and the viscosity of the lubricating oil as the current viscosity of the lubricating oil includes: According to the fourth correspondence between the pre-stored engine type, lubricant type, pressure buildup time difference and the viscosity of the lubricant, the viscosity corresponding to the engine type, the lubricant type, the time difference between the current pressure buildup time and the preset pressure buildup time is determined as the current viscosity of the lubricant.

6. A monitoring system, characterized in that: include: The monitoring system comprises a processor and a memory coupled to each other, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the monitoring system executes the method according to any one of claims 1 to 4.

7. The monitoring system according to claim 6, characterized in that: The monitoring system further comprises a first pressure sensor arranged near an oil pump end in the lubrication system and a second pressure sensor far from the oil pump end, wherein the first pressure sensor and the second pressure sensor are both electrically connected to the processor.

8. A vehicle, characterized in that: It comprises a vehicle body and a monitoring system as claimed in claim 6 or 7, wherein the monitoring system is arranged on the vehicle body.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed on a computer, the computer is enabled to execute the method according to any one of claims 1 to 4.

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