Engine oil quality on-line monitoring method

Abstract

The invention relates to the technical field of automobiles, in particular to an engine oil quality online monitoring method which comprises a first oil storage shell, a servo motor is mounted on the surface of one end of the first oil storage shell, turbine blades are mounted in the first oil storage shell, a first one-way valve is mounted at an oil outlet of the first oil storage shell, and a second liquid storage shell is mounted at an oil outlet of the first one-way valve. An electrode plate I is mounted on the surface of one end in the liquid storage shell II, and an electrode plate II is mounted on the surface of the other end in the liquid storage shell II; the device further comprises a capacitance measuring chip, and a microcontroller is electrically connected to an electrode of the capacitance measuring chip. The engine oil circulation can be accelerated through the turbine blades, and the servo motor drives the turbine blades to stir the engine oil while circularly flowing the engine oil, so that impurities in the engine oil and parts with non-uniform viscosity in the engine oil are uniformly mixed, and data are more accurate during detection.

Description

Technical Field

[0001] The invention relates to the technical field of automobiles, in particular to an online monitoring method for engine oil quality. Background Art

[0002] A car is a means of transportation that is driven by an internal combustion engine and is used to carry people or goods. The engine oil in the car is essential to keep the engine running normally. The quality of the engine oil will change due to concentration, wear and other conditions during long-term use of the car. An engine oil quality monitor is needed for real-time online monitoring. The existing monitoring of engine oil quality is done manually through color, smell and touch. A small number of detectors use dielectric constant pH and viscosity for testing. The above engine oil tests require professional personnel to perform the tests and cannot be performed in real time.

[0003] Some oil quality sensors install the sensor head inside the oil tank and use the oil as the medium to form a capacitor. The oil quality is detected according to the change in the capacitance of the capacitor. However, the sensor head is installed in the oil tank, and the oil in the oil tank is not in a uniform state, which can easily cause data errors. In addition, the oil sensor is in a complex electromagnetic environment, and there may be various interference sources around it, which can easily cause data errors.

[0004] Therefore, those skilled in the art provide an online monitoring method for engine oil quality to solve the problems raised in the above background technology. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides an online monitoring method for engine oil quality, which solves the following problems: the sensor head is installed in the engine oil tank, the engine oil in the engine oil tank is not in a uniform state, which easily causes data errors, and the engine oil sensor is in a complex electromagnetic environment, and there may be various interference sources around it, which easily causes data errors; To achieve the above objectives, the present invention is implemented through the following technical solutions: The technical solution adopted by the present invention to solve the technical problem is: an online monitoring method for engine oil quality, comprising an oil storage shell 1, a servo motor is installed on one end surface of the oil storage shell 1, a turbine blade is installed inside the oil storage shell 1, a one-way valve 1 is installed at the oil outlet of the oil storage shell 1, a liquid storage shell 2 is installed at the oil outlet of the one-way valve 1, an electrode sheet 1 is installed on one end surface of the inside of the liquid storage shell 2, and an electrode sheet 2 is installed on the other end surface of the inside of the liquid storage shell 2; It also includes a capacitance measurement chip, which is electrically connected to the first electrode sheet and the second electrode sheet. The electrodes of the capacitance measurement chip are electrically connected to a microcontroller, and the electrodes of the microcontroller are electrically connected to a display module.

[0006] Preferably, a one-way valve three is welded and installed on the oil inlet of the oil storage shell one, a threaded head one is fixedly installed on the oil inlet of the one-way valve three, a rubber pad one is glued to the outer surface of the threaded head one, a one-way valve two is fixedly installed on the oil outlet of the liquid storage shell two, the oil outlet sleeve of the one-way valve two is provided with a hose, a sealing rotating shaft is fixedly installed on the oil outlet end of the hose, a threaded head two is fixedly installed on the oil outlet end of the sealing rotating shaft, and a rubber pad two is glued to the outer surface of the threaded head two.

[0007] Preferably, the turbine blades are rotatably connected inside the oil storage shell one, and the working end of the servo motor is arranged inside the oil storage shell one and fixedly connected to the turbine blades.

[0008] Preferably, the oil inlet of the one-way valve 1 is fixedly mounted on the oil outlet of the one-way valve 1, and the oil outlet of the one-way valve 1 is fixedly mounted on the oil inlet of the one-way valve 2.

[0009] Preferably, the electrode sheet 1 and the electrode sheet 2 are made of stainless steel thin plates, and the length, width and thickness of the electrode sheet 1 and the electrode sheet 2 are 5 cm, 3 cm and 2 mm respectively.

[0010] Preferably, the model of the capacitance measurement chip is AD7746, the model of the microcontroller is STM32F103, and the microcontroller is electrically connected to the servo motor.

[0011] Preferably, the method comprises the following steps: Step 1: collecting the oil, driving the turbine blades to rotate through the servo motor, and delivering the oil in the engine to the second liquid storage shell; Step 2: Capacitor formation: through step 1, the space between the electrode sheet 1 and the electrode sheet 2 in the liquid storage shell 2 is filled with oil, thereby forming a capacitor; Step 3: conversion and transmission, the capacitance measurement chip converts the change of the capacitance formed in step 2 into a signal circuit for transmission; Step 4: Data processing, the microcontroller receives the signal circuit converted in step 3 and performs data processing on the signal circuit; Step 5: Data display: The display module digitally displays the signal processed in step 4.

[0012] Preferably, in step 1 to step 2, after completing an engine oil quality test, the engine oil last tested inside the liquid storage shell 2 re-enters the engine oil tank.

[0013] Preferably, in step 2 and step 3, the connection between the electrode sheet 1 and the electrode sheet 2 and the capacitance measurement chip is a differential input mode.

[0014] Beneficial effects of the present invention: 1. The oil quality online monitoring method of the present invention can accelerate the circulation of the oil through the turbine blades, and the servo motor drives the turbine blades to stir the oil while circulating the oil, so that the impurities in the oil and the parts with uneven viscosity of the oil are evenly mixed, so that the detection data is more accurate; 2. The online monitoring method for engine oil quality described in the present invention increases the accuracy of capacitance detection by the capacitance measuring chip by fixing electrode sheet 1 and electrode sheet 2 in liquid storage shell 2 and utilizing the closedness of liquid storage shell 2 and the fixation between electrode sheet 1 and electrode sheet 2.

[0015] 3. The online monitoring method for engine oil quality described in the present invention connects electrode sheet 1 and electrode sheet 2 to the capacitance measurement chip in differential input mode. This connection mode has strong anti-interference ability. The engine oil sensor is in a complex electromagnetic environment and there may be various interference sources around it. The differential mode can effectively suppress common-mode interference because the impact of common-mode interference on the two input pins is basically the same and can be offset in the process of calculating the difference. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0017] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 It is a schematic cross-sectional structure diagram of an oil storage shell of the present invention; Figure 3 It is a schematic diagram of the cross-sectional structure of the liquid storage shell of the present invention; Figure 4 It is a schematic diagram of the step structure of the present invention; Figure 5 The figure is a schematic diagram of the connection structure between the electrode sheet 1 and the electrode sheet 2 and the capacitance measurement chip circuit of the present invention.

[0018] In the figure: 1. Oil storage shell 1; 2. servo motor; 3. turbine blade; 4. threaded head 1; 5. rubber pad 1; 6. one-way valve 1; 7. liquid storage shell 2; 8. electrode sheet 1; 9. electrode sheet 2; 10. one-way valve 2; 11. hose; 12. sealed rotating shaft; 13. threaded head 2; 14. rubber pad 2; 15. capacitance measurement chip; 16. microcontroller; 17. display module; 18. one-way valve 3. DETAILED DESCRIPTION

[0019] The embodiment of the present invention provides an online monitoring method for engine oil quality, which solves the following problems: the sensor head is installed in the engine oil tank, the engine oil in the engine oil tank is not in a uniform state, which easily causes data errors, and the engine oil sensor is in a complex electromagnetic environment, and there may be various interference sources around it, which easily causes data errors; In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0020] like Figure 1 - Figure 5 As shown, the oil quality online monitoring method of the present invention comprises an oil storage shell 1, a servo motor 2 is mounted on one end surface of the oil storage shell 1, a turbine blade 3 is mounted inside the oil storage shell 1, a check valve 6 is mounted on the oil outlet of the oil storage shell 1, a liquid storage shell 2 7 is mounted on the oil outlet of the check valve 6, an electrode sheet 1 8 is mounted on one end surface of the inside of the liquid storage shell 2 7, and an electrode sheet 2 9 is mounted on the other end surface of the inside of the liquid storage shell 2 7; It also includes a capacitance measurement chip 15, which is electrically connected to the electrode sheet 1 8 and the electrode sheet 2 9. The electrodes of the capacitance measurement chip 15 are electrically connected to a microcontroller 16, and the electrodes of the microcontroller 16 are electrically connected to a display module 17.

[0021] Through the above technical scheme, the microcontroller 16 will control the servo motor 2 to drive the turbine blades 3 to transport the oil in the oil storage shell 1 to the liquid storage shell 2 7 through the one-way valve 1 6, wherein the one-way valve 1 6 allows the oil to flow from the oil storage shell 1 to the liquid storage shell 2 7, but not from the liquid storage shell 2 7 to the oil storage shell 1, and then the liquid storage shell 2 7 is filled with oil, and the oil filled in the liquid storage shell 2 7 is between the two electrode sheets 1 8 and the electrode sheet 2 9. The liquid storage shell 2 7, the electrode sheet 1 8 and the electrode sheet 2 9 form a capacitor, and the capacitance measurement chip 15 can detect the capacitance value of this capacitor, convert the capacitance value into a digital circuit and transmit it to the microcontroller 16 for analysis, and then the display module 17 displays it.

[0022] A further technical solution is that a one-way valve 3 18 is welded and installed on the oil inlet of the oil storage shell 1, a threaded head 4 is fixedly installed on the oil inlet of the one-way valve 3 18, and a rubber pad 5 is glued to the outer surface of the threaded head 4, and a one-way valve 2 10 is fixedly installed on the oil outlet of the liquid storage shell 2 7, and the oil outlet sleeve of the one-way valve 2 10 is provided with a hose 11, and a sealing rotating shaft 12 is fixedly installed on the oil outlet end of the hose 11, and a threaded head 2 13 is fixedly installed on the oil outlet end of the sealing rotating shaft 12, and a rubber pad 2 14 is glued to the outer surface of the threaded head 2 13.

[0023] Through the above technical scheme, the threaded head 14 is threadedly installed with the engine oil tank, wherein the rubber pad 15 can prevent the leakage of the engine oil during connection, the threaded head 2 13 is threadedly installed with the engine oil tank, wherein the sealing rotating shaft 12 allows the threaded head 2 13 to rotate indirectly with the hose 11 without affecting the installation of the threaded head 2 13, and the rubber pad 2 14 can prevent the leakage of the engine oil during connection, the threaded head 14 and the threaded head 2 13 are both installed in the engine oil tank, so that a closed loop is formed between the entire device and the engine oil tank, and the engine oil can only flow from the threaded head 14 to the oil storage shell 1 through the one-way valve 3 18, and cannot flow back, and the engine oil can only flow from the liquid storage shell 2 7 to the threaded head 2 13 through the one-way valve 2 10, and cannot flow back.

[0024] According to a further technical solution, the turbine blades 3 are rotatably connected inside the oil storage shell 1 , and the working end of the servo motor 2 is arranged inside the oil storage shell 1 and fixedly connected to the turbine blades 3 .

[0025] Through the above technical solution, the servo motor 2 drives the turbine blade 3 to rotate, so that the threaded head 4 draws oil from the engine oil tank, and the oil flows to the oil storage shell 1, the liquid storage shell 2 7, and the hose 11 respectively, and then flows into the engine oil tank through the threaded head 2 13, forming a reflux.

[0026] A further technical solution is that the oil inlet of the one-way valve 6 is fixedly mounted on the oil outlet of the oil storage shell 1, and the oil outlet of the oil storage shell 1 is fixedly mounted on the oil inlet of the one-way valve 10.

[0027] Through the above technical solution, the one-way valve 1 6 and the one-way valve 2 10 can only allow the engine oil to flow in one direction.

[0028] According to a further technical solution, the electrode sheet 1 8 and the electrode sheet 2 9 are made of stainless steel thin plates, and the length, width and thickness of the electrode sheet 1 8 and the electrode sheet 2 9 are 5 cm, 3 cm and 2 mm respectively.

[0029] Through the above technical solution, the electrode sheet 1 8 and the electrode sheet 2 9 are made of stainless steel thin plates, which can increase the service life and provide accurate measurement results. If copper is used, the surface of the copper material will be oxidized, affecting the measurement results.

[0030] According to a further technical solution, the capacitance measuring chip 15 is of model AD7746, the microcontroller 16 is of model STM32F103, and the microcontroller 16 is electrically connected to the servo motor 2 .

[0031] Through the above technical solution, the capacitance measurement chip 15 adopts AD7746, has high-precision capacitance measurement capability, and integrates a capacitance-digital conversion circuit internally. The microcontroller 16 adopts STM32F103, has rich peripheral resources and strong processing capability.

[0032] Further technical solution, step 1: oil collection, the servo motor 2 drives the turbine blade 3 to rotate, and the oil in the engine is transported to the liquid storage shell 2 7; Step 2: Capacitor formation: through step 1, the space between electrode sheet 1 8 and electrode sheet 2 9 in liquid storage shell 2 7 is filled with oil, thereby forming a capacitor; Step 3: conversion and transmission, the capacitance measurement chip 15 converts the change of the capacitance formed in step 2 into a signal circuit for transmission; Step 4: Data processing, the microcontroller 16 receives the signal circuit converted in step 3 and performs data processing on the signal circuit; Step 5: Data display The display module 17 digitally displays the signal processed in step 4.

[0033] According to the above technical solution, in step 1, the microcontroller 16 controls the servo motor 2 to drive the turbine blade 3 to extract the oil inside the oil tank of the automobile engine into the liquid storage shell 2 7. This extraction is not extraction and storage, but circulation storage, and the oil inside 7 is in a flowing form; In step 3, the capacitance value between electrode sheet 1 8 and electrode sheet 2 9 when not filled with engine oil is zero, and the value when filled with qualified engine oil is a normal value. When the quality of the engine oil changes, the capacitance value will change, and the capacitance measurement chip 15 will convert the changed signal into an electrical signal. According to the calculation formula of capacitance: (where C is the capacitance, ε is the dielectric constant of the dielectric, S is the plate area, and d is the plate spacing). When the oil quality changes, its dielectric constant changes, which causes the capacitance to change. The dielectric constant will increase, causing the capacitance value to increase. In addition, the two ends of the electrode sheet 1 8 and the electrode sheet 2 9 are respectively connected to the EXCA pin and CIN1 (+) pin, EXCB pin and CIN1 (-) pin of the capacitance measurement chip 15, wherein CIN1 (-) is used as the negative capacitance input pin of the CDC in the differential mode to form a differential input mode. In the differential mode, common-mode interference can be effectively suppressed because the impact of common-mode interference on the two input pins is basically the same and can be offset in the process of calculating the difference.

[0034] In step 4, the microcontroller 16 can analyze and process the electrical signal of the capacitance measurement chip 15; In step five, the microcontroller 16 converts the processed data into numbers that can be understood by humans through the display module 17 .

[0035] According to a further technical solution, in steps 1 to 4, after completing an oil quality test, the oil last tested inside the liquid storage shell 2 7 will re-enter the oil tank.

[0036] According to a further technical solution, in step 2 and step 3, the connection between the electrode sheet 1 8 and the electrode sheet 2 9 and the capacitance measurement chip 15 is in a differential input mode.

[0037] The embodiment of the present invention also provides an online monitoring method for engine oil quality, and the specific working principle includes the following steps: mechanical part, thread head 14 is threadedly installed in the engine oil tank, thread head 2 13 is also threadedly installed in the engine oil tank, microcontroller 16 controls to start servo motor 2, servo motor 2 works to drive turbine blade 3 to rotate, turbine blade 3 is in the sealed space of oil storage shell 1, and the engine oil in the engine oil tank can be pumped into liquid storage shell 2 7, wherein the engine oil fills between electrode sheet 1 8 and electrode sheet 2 9 inside liquid storage shell 2 7, forming a capacitor to detect the engine oil quality, and then the engine oil will flow to the engine oil tank through hose 11 and rubber pad 2 14, so that the engine oil in the device forms a cycle, and the engine oil quality mechanical real-time detection can be performed when the engine is working; In the circuit part, the capacitance measuring chip 15 can detect the permittivity of the capacitance formed by the electrode piece 1 8 and the electrode piece 2 9 inside the liquid storage shell 2 7 and the engine oil. The electrode piece 1 8 and the electrode piece 2 9 are connected to the capacitance measuring chip 15 in a differential input mode, which makes the detection more accurate. The value detected by the capacitance measuring chip 15 is transmitted to the microcontroller 16 for data analysis, and then displayed by the display module 17.

[0038] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. The method for online monitoring of engine oil quality is characterized by: It comprises an oil storage shell (1), a servo motor (2) is mounted on one end surface of the oil storage shell (1), a turbine blade (3) is mounted inside the oil storage shell (1), a one-way valve (6) is mounted on the oil outlet of the oil storage shell (1), a liquid storage shell (7) is mounted on the oil outlet of the one-way valve (6), an electrode sheet (8) is mounted on one end surface of the liquid storage shell (7), and an electrode sheet (9) is mounted on the other end surface of the liquid storage shell (7); It also includes a capacitance measurement chip (15), the capacitance measurement chip (15) being electrically connected to the first electrode sheet (8) and the second electrode sheet (9), the electrodes of the capacitance measurement chip (15) being electrically connected to a microcontroller (16), and the electrodes of the microcontroller (16) being electrically connected to a display module (17).

2. The method for online monitoring of engine oil quality according to claim 1, characterized in that: A check valve 3 (18) is welded to the oil inlet of the oil storage shell 1 (1), a threaded head 1 (4) is fixedly mounted to the oil inlet of the check valve 3 (18), and a rubber pad 1 (5) is glued to the outer surface of the threaded head 1 (4), a check valve 2 (10) is fixedly mounted to the oil outlet of the liquid storage shell 2 (7), a hose (11) is sleeved on the oil outlet of the check valve 2 (10), a sealing rotating shaft (12) is fixedly mounted to the oil outlet end of the hose (11), a threaded head 2 (13) is fixedly mounted to the oil outlet end of the sealing rotating shaft (12), and a rubber pad 2 (14) is glued to the outer surface of the threaded head 2 (13).

3. The method for online monitoring of engine oil quality according to claim 1, characterized in that: The turbine blade (3) is rotatably connected inside the oil storage shell (1), and the working end of the servo motor (2) is arranged inside the oil storage shell (1) and fixedly connected to the turbine blade (3).

4. The method for online monitoring of engine oil quality according to claim 1, characterized in that: The oil inlet of the one-way valve (6) is fixedly mounted on the oil outlet of the oil storage shell (1), and the oil outlet of the oil storage shell (1) is fixedly mounted on the oil inlet of the one-way valve (10).

5. The method for online monitoring of engine oil quality according to claim 1, characterized in that: The electrode sheet 1 (8) and the electrode sheet 2 (9) are made of stainless steel thin plates, and the length, width and thickness of the electrode sheet 1 (8) and the electrode sheet 2 (9) are 5 cm, 3 cm and 2 mm respectively.

6. The method for online monitoring of engine oil quality according to claim 1, characterized in that: The model of the capacitance measurement chip (15) is AD7746, the model of the microcontroller (16) is STM32F103, and the microcontroller (16) is electrically connected to the servo motor (2).

7. The method for online monitoring of engine oil quality according to claims 1-6, characterized in that: The following steps are involved: Step 1: collecting the engine oil, driving the turbine blades (3) to rotate via the servo motor (2), and transferring the engine oil in the engine to the second liquid storage housing (7); Step 2: Capacitor formation: through step 1, the space between the electrode sheet 1 (8) and the electrode sheet 2 (9) in the liquid storage shell 2 (7) is filled with engine oil, thereby forming a capacitor; Step 3: conversion and transmission, the capacitance measurement chip (15) converts the change of the capacitance formed in step 2 into a signal circuit for transmission; Step 4: Data processing, the microcontroller (16) receives the signal circuit converted in step 3 and performs data processing on the signal circuit; Step 5: Data display: The display module (17) digitally displays the signal processed in step 4.

8. The method for online monitoring of engine oil quality according to claim 7, characterized in that: In step 1 to step 2, after completing a test of the engine oil quality, the engine oil in the liquid storage housing 2 (7) that was tested last time will re-enter the engine oil tank.

9. The method for online monitoring of engine oil quality according to claim 7, characterized in that: In step 2 and step 3, the connection between the electrode sheet 1 (8) and the electrode sheet 2 (9) and the capacitance measurement chip (15) is a differential input mode.

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