Engine oil consumption monitoring method, system and vehicle based on machine vision

Abstract

The present invention relates to the technical field of oil consumption monitoring, and in particular to a device, method and vehicle for monitoring engine oil consumption based on machine vision. The method comprises: obtaining a liquid level image of the engine oil flowing back in the engine; determining the liquid level height and the liquid level inclination angle according to the liquid level image, determining the amount of the engine oil flowing back in the engine according to the liquid level height and the liquid level inclination angle of the engine oil flowing back in the engine, and determining the total amount of the engine oil remaining in the engine in combination with the engine speed. The system comprises: an image acquisition device obtains a liquid level image of the engine oil; a processor determines the liquid level height and the liquid level inclination angle of the engine oil according to the liquid level image, determining the amount of the engine oil flowing back in the engine according to the liquid level height and the liquid level inclination angle, and determining the total amount of the engine oil remaining in the engine in combination with the engine speed. The method can solve the problem of inaccurate monitoring data caused by the presence of splashing and wall-mounted engine oil, and some bubbles in some cases, in the liquid level measurement method used in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of oil consumption monitoring, and in particular to a method, system and vehicle for monitoring engine oil consumption based on machine vision. Background Art

[0002] As the high power density of automotive diesel engines increases, the cylinder pressure and piston linear speed also increase significantly, making it difficult for the lubricating oil film to form. When the friction pair in the diesel engine cylinder is severely worn, it will increase the oil consumption of the diesel engine, affect the power of the diesel engine, and increase its emissions and energy consumption. Therefore, the change in diesel engine oil consumption is related to the wear of the friction pair in the cylinder. At present, the judgment of the wear state of the friction pair in the diesel engine cylinder by the commercial vehicle service station is based on the consumption state of the diesel engine oil, that is, the wear state of the diesel engine cylinder is judged by the change of the oil dipstick level within a certain period of time.

[0003] At present, the monitoring of engine oil consumption is mostly based on liquid level measurement, including capacitance method and resistance method. The relationship between liquid level height and oil volume is established, so that the change of oil volume can be identified by identifying the change of liquid level, and then the engine oil consumption can be calculated.

[0004] The oil flow path and its distribution are very complex during engine operation. The capacitance method and the resistance method can identify the oil consumption and liquid level in a laboratory environment. The oil level can be identified through the relationship between the liquid level height of the resistance wire and the voltage signal. However, due to the fluctuation of the oil level and the presence of bubbles during engine operation, the measurement error is large, making it difficult to achieve engineering application. In addition, oil splashing will also affect the monitoring accuracy. Summary of the invention

[0005] In view of the defects existing in the prior art, the purpose of the present invention is to provide an engine oil consumption monitoring method, system and vehicle based on machine vision, which can solve the problem of inaccurate monitoring data due to the presence of splashing and wall oil, and some bubbles in the resistance method liquid level measurement used in the prior art.

[0006] In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0007] In a first aspect, the present invention provides a method for monitoring engine oil consumption based on machine vision, comprising the following steps:

[0008] Acquire a liquid level image of the returning oil in the engine;

[0009] Based on the liquid level image of the returning oil in the engine, the liquid level height and the liquid level inclination angle of the returning oil in the engine are determined. Based on the liquid level height and the liquid level inclination angle of the returning oil in the engine, the amount of oil returning in the engine is determined. Combined with the engine speed, the total remaining oil amount in the engine is determined.

[0010] In some optional solutions, a connecting vessel is connected to the engine oil pan to display the liquid level of the engine return oil.

[0011] In some optional solutions, the method of determining the amount of oil refluxed in the engine based on the liquid level height and liquid level inclination angle of the refluxed oil in the engine and determining the total amount of oil remaining in the engine in combination with the engine speed includes:

[0012] According to the liquid level height and liquid level inclination angle of the engine oil, combined with the shape of the engine oil pan, determine the cross-sectional area of ​​the engine oil return flow;

[0013] Determine the amount of engine oil returning from the engine based on the cross-sectional area of ​​the engine oil returning from the engine and the shape of the engine oil pan;

[0014] According to the engine speed, determine the amount of wall splash oil corresponding to the engine speed.

[0015] The total amount of oil remaining in the engine is determined by combining the amount of oil splashing on the wall and the amount of oil returning from the engine.

[0016] In some optional solutions, if the cross-section of the engine oil pan consists of a rectangle and a trapezoid, when the liquid surface inclination angle is 0:

[0017]

[0018] Among them, y is the liquid level height, L is the length of the oil pan rectangular parallelepiped, and h is the height of the oil pan rectangular parallelepiped. a is the angle between the trapezoidal surface and the horizontal plane when the liquid surface inclination angle is 0;

[0019] When the liquid surface is inclined at angle b on the trapezoidal extension:

[0020]

[0021] Among them, L1 is L / cosb, h1 is y- ;

[0022] When the liquid surface is inclined at an angle b in the opposite direction of the trapezoidal extension:

[0023]

[0024] Among them, L1 is L / cosb, h1 is y- , It is the cross-sectional area of ​​the oil returning to the engine.

[0025] In some optional schemes, the engine oil consumption monitoring method based on machine vision also includes calculating the oil consumption rate by obtaining the total remaining oil amount in the engine twice and the interval time between the two obtaining the total remaining oil amount in the engine.

[0026] In some optional solutions, determining the liquid level height and liquid level inclination angle of the engine return oil according to the liquid level image of the engine return oil includes:

[0027] Convert the RGB space of the liquid surface image into the HSV color space;

[0028] An improved bilateral filter function is used to replace the Gaussian filter function in the multi-scale Retinex algorithm as the center surround function, the V brightness component in the HSV color space is enhanced, and the reflection component is corrected by a nonlinear function.

[0029] The S component is corrected by the enhanced V brightness component, the image color is restored by the color restoration function, and finally the HSV image is converted to an RGB image to obtain the enhanced liquid surface image;

[0030] According to the enhanced liquid level image, the liquid level height and liquid level inclination angle of the engine oil are identified.

[0031] In a second aspect, the present invention further provides an engine oil consumption monitoring system based on machine vision, comprising:

[0032] An image acquisition device, which is used to obtain a liquid level image of the engine oil in the engine oil pan;

[0033] The processor is used to determine the liquid level and liquid level inclination angle of the returning oil in the engine according to the liquid level image of the returning oil in the engine, determine the amount of oil returning in the engine according to the liquid level and liquid level inclination angle of the returning oil in the engine, and determine the total remaining amount of oil in the engine in combination with the engine speed.

[0034] In some optional schemes, the machine vision-based engine oil consumption monitoring system also includes a communicating device connected to the engine oil pan for displaying the liquid level of the engine return oil.

[0035] In some optional solutions, a valve block is provided at the connection between the communicating vessel and the engine oil pan.

[0036] In a third aspect, the present invention further provides a vehicle, comprising any one of the above-mentioned engine oil consumption monitoring systems based on machine vision.

[0037] Compared with the prior art, the advantages of the present invention are: the liquid level image of the refluxed oil in the engine is obtained by the image acquisition device 3, the liquid level height and liquid level inclination angle of the refluxed oil in the engine are determined by using the obtained liquid level image of the refluxed oil in the engine, the amount of oil refluxed in the engine is determined according to the liquid level height and liquid level inclination angle of the refluxed oil in the engine, and the total amount of oil remaining in the engine is determined in combination with the engine speed. This scheme can avoid the problem of inaccurate monitoring data caused by splashing and wall-hanging oil in the resistance method of liquid level measurement. This scheme not only takes into account the inaccurate monitoring liquid level data caused by splashing and wall-hanging oil, but also takes into account the influence of splashing and wall-hanging oil on the longitudinal beam, and takes into account the influence of engine speed on the amount of splashing and wall-hanging oil, which can improve the accuracy of monitoring the amount of oil in the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 is a flow chart of a method for monitoring engine oil consumption based on machine vision in an embodiment of the present invention;

[0040] Figure 2 is a flowchart of image processing in an embodiment of the present invention;

[0041] Figure 3 A flow chart of liquid level recognition in an embodiment of the present invention;

[0042] Figure 4 Schematic diagram of the case where the liquid surface inclination angle is 0 in an embodiment of the present invention;

[0043] Figure 5 Schematic diagram of the liquid level when the vehicle goes uphill in an embodiment of the present invention;

[0044] Figure 6 Schematic diagram of the liquid level when the vehicle is going downhill in an embodiment of the present invention;

[0045] Figure 7 Schematic diagram of an engine oil consumption monitoring system based on machine vision in an embodiment of the present invention.

[0046] In the figure: 1. Connecting vessel; 2. Engine oil pan; 3. Image acquisition device; 4. Valve block; 5. Bracket. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0048] The embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

[0049] Figure 1 FIG. 1 is a flow chart of a method for monitoring engine oil consumption based on machine vision in an embodiment of the present invention. Figure 1 As shown, the present invention provides an engine oil consumption monitoring method based on machine vision, comprising the following steps:

[0050] S1: Acquire a liquid level image of the engine oil returning from the engine.

[0051] After the engine has been stationary for a period of time, the oil that flows back into the engine is the total remaining amount of oil in the engine; when the engine is running, the total remaining amount in the engine includes the oil that flows back into the engine oil pan 2, the splashing oil and the oil hanging on the wall. The splashing oil refers to the oil that is being thrown into the air, and the oil hanging on the wall is the oil hanging on the gears and the inner wall of the engine cylinder.

[0052] An image acquisition device is used to acquire a liquid level image of the engine oil returning in the engine. In this example, an industrial camera is used to acquire a liquid level image of the engine oil returning in the engine.

[0053] In order to obtain the liquid level image of the engine oil returning, in some optional embodiments, the liquid level of the engine oil returning is displayed by connecting the connecting vessel 1 to the engine oil pan 2. Generally, the liquid level of the engine oil returning cannot be directly obtained. In this solution, the connecting vessel principle is used to display the oil level in the engine outside the engine. The connecting vessel is made of transparent material so that the camera can obtain the liquid level image in the connecting vessel 1.

[0054] In other embodiments, the oil tank may be designed to have a transparent window so that the camera can directly obtain the oil level in the engine.

[0055] S2: Determine the liquid level and liquid level inclination angle of the returning oil in the engine according to the liquid level image of the returning oil in the engine, determine the amount of returning oil in the engine according to the liquid level and liquid level inclination angle of the returning oil in the engine, and determine the total remaining amount of oil in the engine in combination with the engine speed.

[0056] In this example, the liquid level height is identified by improving the Retinex algorithm, and the test images of the engine in different states (tilt angles) are used to identify the oil level in different states using a supervised learning method based on a support vector machine.

[0057] Figure 2 is a flowchart of image processing in an embodiment of the present invention; Figure 3 Flow chart of liquid level recognition in an embodiment of the present invention; Figure 2 and Figure 3 As shown, in some optional embodiments, determining the liquid level height and liquid level inclination angle of the return oil in the engine according to the liquid level image of the return oil in the engine includes:

[0058] S21A: Convert the RGB space of the liquid surface image to the HSV color space.

[0059] S22A: An improved bilateral filter function is used to replace the Gaussian filter function in the multi-scale Retinex algorithm as the center-surround function, the V brightness component in the HSV color space is enhanced, and the reflection component is corrected by a nonlinear function.

[0060] S23A: The S component is corrected by the enhanced V brightness component, the image color is restored by the color restoration function, and finally the HSV image is converted to an RGB image to obtain the enhanced liquid surface image.

[0061] S24A: Liquid level height and liquid level inclination angle of the engine oil according to the enhanced liquid level image.

[0062] After obtaining the enhanced image, the Canny edge algorithm is used to detect the liquid level line, and then the liquid level height and inclination angle are extracted by the geometric parameter method.

[0063] Of course, in other embodiments, a gyroscope based on the engine may be installed on the vehicle, and the gyroscope may be used to directly reflect the liquid level inclination angle of the reflux oil in the engine.

[0064] In some optional embodiments, the method of determining the amount of oil refluxed in the engine based on the liquid level height and liquid level inclination angle of the refluxed oil in the engine and determining the total amount of oil remaining in the engine in combination with the engine speed includes:

[0065] S21B: Determine the cross-sectional area of ​​the engine oil return flow based on the engine oil level height and the liquid level inclination angle and the shape of the engine oil pan.

[0066] Generally, the part of the engine oil pan used to accommodate the return machine is an irregular shape. For example, in this example, if the cross section of the engine oil pan is composed of a rectangle and a trapezoid, the lower half of the engine oil pan is a rectangular parallelepiped, and the cross section of the upper half is a trapezoid. The cross section of the engine oil pan is a cross section from the side of the engine where the connecting vessel 1 is provided, and the connecting vessel 1 is provided in the middle of the rectangular parallelepiped.

[0067] Figure 4 Schematic diagram of the case where the liquid surface inclination angle is 0 in an embodiment of the present invention. Figure 1 As shown, when the liquid surface inclination angle is 0:

[0068]

[0069] Among them, y is the liquid level height, L is the length of the oil pan rectangular parallelepiped, and h is the height of the oil pan rectangular parallelepiped. a It is the angle between the trapezoidal surface and the horizontal plane when the liquid surface inclination angle is 0.

[0070] Figure 5 Schematic diagram of the liquid level when the vehicle is going uphill in the embodiment of the present invention. Figure 5 As shown in the figure, when the car goes uphill, the liquid surface tilts toward the trapezoidal extension at an angle b:

[0071]

[0072] Among them, L1 is L / cosb, h1 is y- .

[0073] Figure 6 Schematic diagram of the liquid level when the vehicle is going downhill in the embodiment of the present invention. Figure 6 As shown in the figure, when the car goes downhill, the liquid surface tilts in the opposite direction of the trapezoidal extension at an angle b:

[0074]

[0075] Among them, L1 is L / cosb, h1 is y- , is the cross-sectional area of ​​the reflux oil in the engine, and the cross-sectional area is also the cross-sectional area viewed from the side of the engine where the connecting vessel 1 is provided.

[0076] S22B: Determine the amount of oil returning from the engine based on the cross-sectional area of ​​the oil returning from the engine and the shape of the engine oil pan.

[0077] In this example, the amount of oil returned from the engine V = ,in, is the width of the oil pan rectangle.

[0078] In other embodiments, the shape of the engine oil pan is different, and the cross-sectional area of ​​the return oil in the engine is also different. The overall calculation method is based on the shape and inclination angle of the engine oil pan. The cross-sectional area of ​​the return oil in the engine is first calculated, and then the amount of oil returning to the engine is determined based on the shape of the engine oil pan.

[0079] If an engine-based gyroscope is installed on the vehicle, the gyroscope can directly reflect the liquid level inclination angle of the engine oil returning. The height of the engine oil returning can be obtained by combining the connecting vessel 1 and the camera, thereby determining the amount of the engine oil returning, which can improve the accuracy of recognition and the calculation speed.

[0080] S23B: According to the engine speed, the amount of wall splashing oil corresponding to the engine speed is determined.

[0081] When the engine is running, the oil pump pumps the oil in the oil pan into the oil channel, and then transports it to each friction pair through the oil channel, and then drips into the oil pan, which causes the liquid level to fluctuate. In the prior art, the electronic oil dipstick is installed in the oil pan. Due to the fluctuation of the oil pan liquid level, it has a large measurement error. In addition, the different inclination angles of the engine affect the liquid level height, resulting in the electronic oil dipstick can only be used as a switch value for alarm, and it is impossible to achieve real-time oil quantity monitoring. In addition, when the engine is running, the total remaining amount in the engine includes the oil refluxed into the engine oil pan 2, the splashed oil and the wall oil. The splashed oil refers to the oil that is being thrown in the air, and the wall oil is the oil hanging on the gear and the inner wall of the engine cylinder. In the prior art, the resistance method liquid level measurement used, due to the presence of splashed and wall oil, some of which also have bubbles, will cause inaccurate monitoring data.

[0082] In this embodiment, the oil pan solid model and liquid level model are first used in CAE software, and the oil in the engine oil passage under different working conditions is considered. To monitor the oil consumption in real time, it is necessary to consider the identification of the oil pan oil level under the stationary state and the monitoring of the oil level under the moving state. According to the liquid level dynamic change curve under the fixed cycle working condition, the cycle working condition liquid level fitting analysis is performed to calibrate the relationship between the oil pan liquid level, engine working condition and oil level.

[0083] During calibration, different oil pan liquid levels are calibrated, that is, the oil returned to the engine oil pan 2 corresponds to the amount of oil splashing and hanging on the wall when the engine speed is different.

[0084] Then, during actual monitoring, the corresponding amount of oil splashing and hanging on the wall can be obtained through the engine speed and the amount of oil flowing back into the engine oil pan.

[0085] The oil pan liquid level can be obtained after being left still for a certain period of time, that is, the oil that has completely returned to the engine oil pan 2. Then the engine is started to obtain the amount of oil that has returned to the engine oil pan at different speeds. By calibrating different oil pan liquid levels, that is, the oil that has completely returned to the engine oil pan 2, different oil pan liquid levels that have completely returned to the oil pan, that is, different total oil amounts, can be obtained, corresponding to the amount of oil splashing and hanging on the wall at different engine speeds.

[0086] In other embodiments, during calibration, a calibration table can be established by calibrating a set number of different total oil volumes, corresponding to the splashing and wall oil volumes at different engine speeds, and combining the difference method to obtain the entire calibration data, or calculating by the difference method during calculation.

[0087] S24B: Determine the total amount of oil remaining in the engine by combining the amount of oil splashing off the wall and the amount of oil returning from the engine.

[0088] In this example, the total amount of oil in the engine is obtained by adding the amount of oil splashing on the wall and the amount of oil returning from the engine.

[0089] In some optional embodiments, the machine vision-based engine oil consumption monitoring method further includes: calculating the oil consumption rate by obtaining the total remaining oil amount in the engine twice and the interval time between the two obtaining the total remaining oil amount in the engine.

[0090] In addition, the total amount of oil remaining in the engine can be obtained through the interval time, as well as the interval time, to calculate the oil consumption rate. In addition, the relationship between the oil consumption rate and the mileage can be obtained in combination with the vehicle's mileage. This design can predict when the vehicle needs to add oil, allowing the driver to better plan his trip and avoid the dilemma of needing to add oil midway during long-distance driving.

[0091] Figure 7 FIG. 1 is a schematic diagram of an engine oil consumption monitoring system based on machine vision in an embodiment of the present invention. Figure 7 As shown, on the other hand, the present invention also provides an engine oil consumption monitoring system based on machine vision, including: an image acquisition device 3 and a processor.

[0092] Among them, the image acquisition device 3 is used to obtain the liquid level image of the oil in the engine oil pan 2; the processor is used to determine the liquid level height and liquid level inclination angle of the returning oil in the engine according to the liquid level image of the returning oil in the engine, and determine the amount of oil returning in the engine according to the liquid level height and liquid level inclination angle of the returning oil in the engine, and determine the total remaining amount of oil in the engine in combination with the engine speed.

[0093] In this solution, the liquid level image of the refluxed oil in the engine is obtained by the image acquisition device 3, and the liquid level height and liquid level inclination angle of the refluxed oil in the engine are determined by using the obtained liquid level image of the refluxed oil in the engine. The amount of oil refluxed in the engine is determined based on the liquid level height and liquid level inclination angle of the refluxed oil in the engine, and the total amount of oil remaining in the engine is determined in combination with the engine speed. This solution can avoid the problem of inaccurate monitoring data caused by splashing and wall-hanging oil in the resistance method of liquid level measurement. This solution not only takes into account the inaccurate monitoring liquid level data caused by splashing and wall-hanging oil, but also takes into account the influence of splashing and wall-hanging oil on the longitudinal beam, and takes into account the influence of engine speed on the amount of splashing and wall-hanging oil, which can improve the accuracy of monitoring the amount of oil in the engine.

[0094] In this example, an image acquisition device 3 is used to acquire a liquid level image of the refluxed oil in the engine. The image acquisition device 3 used is an industrial camera.

[0095] In order to obtain a liquid level image of the return oil in the engine, in some optional embodiments, the engine oil consumption monitoring system based on machine vision also includes a connecting vessel 1, which is connected to the engine oil pan 2 and is used to display the liquid level of the return oil in the engine.

[0096] In this example, the liquid level of the engine return oil is displayed by connecting the connecting vessel 1 to the engine oil pan 2. Generally, it is impossible to directly obtain the liquid level of the engine return oil. In this solution, the connecting vessel principle is used to display the oil level in the engine outside the engine. The connecting vessel is made of transparent materials so that the camera can obtain the liquid level image in the connecting vessel 1.

[0097] In other embodiments, the oil tank may be designed to have a transparent window so that the camera can directly obtain the oil level in the engine.

[0098] In addition, in this example, the industrial camera is fixed by the bracket 5, and the industrial camera is focused on the communicating vessel 1. The industrial camera is fixed on the vehicle frame by the bracket 5, which can avoid the influence of the high-frequency vibration of the engine on the system. In other embodiments, the industrial camera can also be set in other places according to different on-site structures, as long as the industrial camera is focused on the communicating vessel 1.

[0099] In some optional embodiments, a valve block 4 is provided at the connection between the communicating vessel 1 and the engine oil sump 2 .

[0100] In this example, the communicating vessel needs to be relatively clean for taking photos. The long-term use of engine oil will cause the surface of the communicating vessel to be very dirty, and the communicating vessel 1 needs to be replaced regularly. When replacing the communicating vessel 1, close the valve block 4 to prevent the oil in the engine oil pan 2 from flowing out. A valve block 4 is provided at the connection between the communicating vessel 1 and the engine oil pan 2, which can control the connection between the engine oil in the engine oil pan 2 and the communicating vessel 1, making the device relatively independent from the engine lubrication system, and facilitating the installation and replacement of equipment.

[0101] In a third aspect, the present invention further provides a vehicle, comprising any one of the above-mentioned engine oil consumption monitoring systems based on machine vision.

[0102] The engine oil consumption monitoring system based on machine vision includes: an image acquisition device 3 and a processor. The image acquisition device 3 is used to obtain the liquid level image of the oil in the engine oil pan 2; the processor is used to determine the liquid level height and liquid level inclination angle of the engine return oil according to the liquid level image of the engine return oil, determine the amount of the engine return oil according to the liquid level height and liquid level inclination angle of the engine return oil, and determine the total amount of the engine oil remaining in the engine in combination with the engine speed.

[0103] Furthermore, the engine oil consumption monitoring system based on machine vision can execute any of the above-mentioned engine oil consumption monitoring methods based on machine vision.

[0104] The method obtains a liquid level image of the returning oil in the engine; determines the liquid level height and liquid level inclination angle of the returning oil in the engine according to the liquid level image of the returning oil in the engine; determines the amount of oil returning in the engine according to the liquid level height and liquid level inclination angle of the returning oil in the engine; and determines the total amount of oil remaining in the engine in combination with the engine speed.

[0105] In order to obtain the liquid level image of the engine oil returning, in some optional embodiments, the liquid level of the engine oil returning is displayed by connecting the connecting vessel 1 to the engine oil pan 2. Generally, the liquid level of the engine oil returning cannot be directly obtained. In this solution, the connecting vessel principle is used to display the oil level in the engine outside the engine. The connecting vessel is made of transparent material so that the camera can obtain the liquid level image in the connecting vessel 1.

[0106] The total amount of oil remaining in the engine obtained through the interval time and the interval time are used to calculate the oil consumption rate. In addition, the relationship between the oil consumption rate and the mileage can be obtained by combining the vehicle's mileage. This design can predict when the vehicle needs to add oil, allowing the driver to better plan his trip and avoid the dilemma of needing to add oil midway during long-distance driving.

[0107] This solution can avoid the problem of inaccurate monitoring data caused by splashing and hanging oil, and some bubbles in the liquid level measurement by the resistance method. This solution not only takes into account the inaccurate monitoring liquid level data caused by splashing and hanging oil, but also takes into account the impact of splashing and hanging oil on the longitudinal beam, and the impact of engine speed on the amount of splashing and hanging oil, which can improve the accuracy of monitoring the amount of oil in the engine.

[0108] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application 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 cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0109] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0110] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A method for monitoring engine oil consumption based on machine vision, characterized in that: The following steps are involved: Acquire a liquid level image of the returning oil in the engine; According to the liquid level image of the engine oil returning in the engine, the liquid level height and liquid level inclination angle of the engine oil returning in the engine are determined; according to the liquid level height and liquid level inclination angle of the engine oil returning in the engine, the amount of the engine oil returning in the engine is determined; and in combination with the engine speed, the total amount of the engine oil remaining in the engine is determined, including: According to the liquid level height and liquid level inclination angle of the engine oil, combined with the shape of the engine oil pan, determine the cross-sectional area of ​​the engine oil return flow; Determine the amount of engine oil returning from the engine based on the cross-sectional area of ​​the engine oil returning from the engine and the shape of the engine oil pan; According to the engine speed, determine the amount of wall splash oil corresponding to the engine speed. The total amount of oil remaining in the engine is determined by combining the amount of oil splashing on the wall and the amount of oil returning from the engine.

2. The method for monitoring engine oil consumption based on machine vision according to claim 1, characterized in that: The liquid level of the engine return oil is displayed by connecting the connecting tube (1) to the engine oil pan (2).

3. The method for monitoring engine oil consumption based on machine vision according to claim 1, characterized in that: If the cross section of the engine oil pan consists of a rectangle and a trapezoid, when the liquid level inclination is 0: Among them, y is the liquid level height, L is the length of the oil pan rectangular parallelepiped, and h is the height of the oil pan rectangular parallelepiped. a is the angle between the trapezoidal surface and the horizontal plane when the liquid surface inclination angle is 0; When the liquid surface is inclined at angle b on the trapezoidal extension: Among them, L1 is L / cosb, h1 is y- ; When the liquid surface is inclined at an angle b in the opposite direction of the trapezoidal extension: Among them, L1 is L / cosb, h1 is y- , It is the cross-sectional area of ​​the oil returning to the engine.

4. The method for monitoring engine oil consumption based on machine vision according to claim 1, further comprising: The oil consumption rate is calculated by obtaining the total amount of oil remaining in the engine twice and the interval between the two times of obtaining the total amount of oil remaining in the engine.

5. The method for monitoring engine oil consumption based on machine vision according to claim 2, characterized in that: Determining the liquid level height and liquid level inclination angle of the engine return oil according to the liquid level image of the engine return oil comprises: Convert the RGB space of the liquid surface image into the HSV color space; An improved bilateral filter function is used to replace the Gaussian filter function in the multi-scale Retinex algorithm as the center surround function, the V brightness component in the HSV color space is enhanced, and the reflection component is corrected by a nonlinear function. The S component is corrected by the enhanced V brightness component, the image color is restored by the color restoration function, and finally the HSV image is converted to an RGB image to obtain the enhanced liquid surface image; According to the enhanced liquid level image, the liquid level height and liquid level inclination angle of the engine oil.

6. An engine oil consumption monitoring system based on machine vision, characterized in that: include: An image acquisition device (3) for acquiring an image of the liquid level of the engine oil in the engine oil pan (2); The processor is used to determine the liquid level and liquid level inclination angle of the engine return oil according to the liquid level image of the engine return oil, determine the amount of the engine return oil according to the liquid level and liquid level inclination angle of the engine return oil, and determine the total amount of engine oil remaining in the engine in combination with the engine speed, including: According to the liquid level height and liquid level inclination angle of the engine oil, combined with the shape of the engine oil pan, determine the cross-sectional area of ​​the engine oil return flow; Determine the amount of engine oil returning from the engine based on the cross-sectional area of ​​the engine oil returning from the engine and the shape of the engine oil pan; According to the engine speed, determine the amount of wall splash oil corresponding to the engine speed. The total amount of oil remaining in the engine is determined by combining the amount of oil splashing on the wall and the amount of oil returning from the engine.

7. The engine oil consumption monitoring system based on machine vision according to claim 6, characterized in that: It also includes a connecting vessel (1) which is connected to the engine oil pan (2) and is used to display the liquid level of the engine return oil.

8. The engine oil consumption monitoring system based on machine vision according to claim 7, characterized in that: A valve block (4) is provided at the connection between the communicating vessel (1) and the engine oil sump (2).

9. A vehicle, characterized in that: It includes the engine oil consumption monitoring system based on machine vision as described in claim 6.

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