A method, device and monitoring equipment for monitoring cleanliness of hydraulic oil

Abstract

The present invention provides a method, device and monitoring equipment for monitoring the cleanliness of hydraulic oil, the method comprising: obtaining the current cleanliness detection result collected by the cleanliness sensor and the current pressure and / or current temperature of the hydraulic oil circuit; based on the relationship between the current pressure and the preset pressure and the detection result and / or the relationship between the current temperature and the preset temperature and the detection result, correcting the current cleanliness detection result; and determining the current cleanliness level of the hydraulic oil in the hydraulic oil system based on the corrected current cleanliness detection result. Thus, the current cleanliness detection result of the cleanliness sensor is corrected by real-time monitoring of the pressure and temperature of the hydraulic oil circuit, avoiding the problem that the cleanliness sensor is affected by external environmental interference and the detection result, improving the accuracy of the monitoring result, and obtaining the precise cleanliness level of the hydraulic oil, making it easy to grasp the real state of the hydraulic oil, and realizing accurate monitoring of the cleanliness of the hydraulic oil.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering machinery, and in particular to a method, a device and a monitoring equipment for the cleanliness of hydraulic oil. Background Art

[0002] With the improvement of my country's economic strength and the rapid growth of national construction needs, construction machinery has developed rapidly and is widely used in many industries such as construction, transportation, mining and water conservancy projects. Many construction machinery use hydraulic oil systems. Take hydraulic excavators as an example. As an important construction and mining equipment, it plays a very important role in the fields of engineering construction and ore mining. During the operation of the hydraulic oil system of the excavator, the particles generated by the wear of the components and the pollutants from the external environment will cause the hydraulic oil to be continuously contaminated, and the contaminated hydraulic oil will aggravate the wear of the hydraulic components, and even cause the components to be blocked and various hydraulic failures. Therefore, how to monitor the cleanliness of the hydraulic oil is particularly important.

[0003] In the prior art, the cleanliness of hydraulic oil is usually monitored by a cleanliness sensor, and a reminder to replace the hydraulic oil is given when the cleanliness reaches a certain cleanliness threshold. Although this method can monitor the hydraulic oil, since the detection accuracy of the cleanliness sensor itself is easily affected by environmental factors, it can only achieve rough monitoring, with limited monitoring accuracy, and it is difficult to reflect the true state of the hydraulic oil. Therefore, how to achieve accurate monitoring of the cleanliness of hydraulic oil has become an urgent problem to be solved. Summary of the invention

[0004] In view of this, the embodiments of the present invention provide a hydraulic oil cleanliness monitoring method, device and monitoring equipment to overcome the problem in the prior art that the hydraulic oil cleanliness monitoring accuracy is low and it is difficult to reflect the real state of the hydraulic oil.

[0005] According to a first aspect, an embodiment of the present invention provides a method for monitoring the cleanliness of hydraulic oil, which is applied to a hydraulic oil system, wherein a cleanliness sensor is provided in a hydraulic oil circuit of the hydraulic oil system, and the method comprises:

[0006] Acquire the current cleanliness detection result collected by the cleanliness sensor and the current pressure and / or current temperature of the hydraulic oil circuit;

[0007] Based on the relationship between the current pressure, the preset pressure and the test result and / or the relationship between the current temperature, the preset temperature and the test result, the current cleanliness test result is corrected;

[0008] A current cleanliness level of the hydraulic oil in the hydraulic oil system is determined based on the corrected current cleanliness detection result.

[0009] Optionally, determining the current cleanliness level of the hydraulic oil in the hydraulic oil system based on the corrected current cleanliness detection result includes:

[0010] Obtain the relationship between the preset test results and the cleanliness level;

[0011] Based on the relationship between the preset detection result and the cleanliness level, the current cleanliness level corresponding to the corrected current cleanliness detection result is determined.

[0012] Optionally, the method further comprises:

[0013] The hydraulic oil system is controlled based on the current cleanliness level.

[0014] Optionally, controlling the hydraulic oil system based on the current cleanliness level includes:

[0015] Determining whether the current cleanliness level reaches a first preset level;

[0016] When the current cleanliness level reaches the first preset level, the hydraulic oil system is controlled to stop working.

[0017] Optionally, when the current cleanliness level does not reach the first preset level, it is determined whether the current cleanliness level reaches a second preset level, and the cleanliness corresponding to the second preset level is better than the cleanliness corresponding to the first preset level;

[0018] When the current cleanliness level reaches the second preset level, the operating power of the hydraulic oil system is limited.

[0019] According to a second aspect, an embodiment of the present invention provides a hydraulic oil cleanliness monitoring device, which is applied to a hydraulic oil system, wherein a cleanliness sensor is provided in a hydraulic oil circuit of the hydraulic oil system, and the device comprises:

[0020] An acquisition module, used to acquire the current cleanliness detection result collected by the cleanliness sensor and the current pressure and / or current temperature of the hydraulic oil circuit;

[0021] A first processing module, configured to correct the current cleanliness test result based on a relationship between a current pressure, a preset pressure and a test result and / or a relationship between a current temperature, a preset temperature and a test result;

[0022] The second processing module is used to determine the current cleanliness level of the hydraulic oil in the hydraulic oil system based on the corrected current cleanliness detection result.

[0023] According to a third aspect, an embodiment of the present invention provides a hydraulic oil cleanliness monitoring device, which is applied to a hydraulic oil system. The hydraulic oil cleanliness monitoring device comprises: a controller and a cleanliness sensor, a pressure sensor and / or a temperature sensor arranged in a hydraulic oil circuit of the hydraulic oil system, wherein:

[0024] The controller is respectively connected to the cleanliness sensor, the pressure sensor and the temperature sensor;

[0025] The cleanliness sensor is used to collect the current cleanliness detection result of the hydraulic oil circuit, the pressure sensor is used to collect the current pressure of the hydraulic oil circuit, and the temperature sensor is used to collect the current temperature of the hydraulic oil circuit;

[0026] The controller includes: a memory and a processor, the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the method described in the first aspect and any optional implementation manner of the first aspect by executing the computer instructions.

[0027] Optionally, the hydraulic oil cleanliness monitoring device further includes: a result output device connected to the controller, wherein the result output device is used to output the current cleanliness level.

[0028] Optionally, the hydraulic oil cleanliness monitoring device further includes:

[0029] an alarm connected to the controller, the controller being used to drive the alarm to sound an alarm according to the current cleanliness level; and / or

[0030] A display screen connected to the controller, wherein the display screen is used to output the current cleanliness level.

[0031] Optionally, the alarm is a plurality of indicator lights, each indicator light is set in one-to-one correspondence with a cleanliness level, and the controller is used to drive the indicator light corresponding to the current cleanliness level to light up.

[0032] Optionally, the hydraulic oil cleanliness monitoring device further includes:

[0033] A server and a mobile terminal, wherein the server is in communication with the controller and is used to receive a current cleanliness level sent by the controller and send the current cleanliness level to the mobile terminal.

[0034] Optionally, the engineering machinery is an excavator.

[0035] According to a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, wherein the computer instructions are used to enable the computer to execute the method described in the first aspect or any optional implementation manner of the first aspect.

[0036] The technical solution of the present invention has the following advantages:

[0037] The hydraulic oil cleanliness monitoring method, device and monitoring equipment provided by the embodiment of the present invention obtain the current cleanliness detection result collected by the cleanliness sensor and the current pressure and current temperature of the hydraulic oil circuit; based on the relationship between the current pressure and the preset pressure and the detection result, and the relationship between the current temperature and the preset temperature and the detection result, the current cleanliness detection result is corrected; based on the corrected current cleanliness detection result, the current cleanliness level of the hydraulic oil in the hydraulic oil system is determined. Thus, the current cleanliness detection result of the cleanliness sensor is corrected by real-time monitoring of the pressure and temperature of the hydraulic oil circuit, avoiding the problem that the cleanliness sensor is affected by external environmental interference and the detection result, improving the accuracy of the monitoring result, and obtaining the precise cleanliness level of the hydraulic oil, which is convenient for grasping the true state of the hydraulic oil and realizing accurate monitoring of the cleanliness of the hydraulic oil. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0039] Figure 1 It is a structural schematic diagram of a hydraulic oil cleanliness monitoring device according to an embodiment of the present invention;

[0040] Figure 2 A flow chart of a method for monitoring the cleanliness of hydraulic oil according to an embodiment of the present invention;

[0041] Figure 3 This is a schematic diagram of an experiment on the influence of temperature and pressure on the detection results of a cleanliness sensor according to an embodiment of the present invention;

[0042] Figure 4 It is a schematic diagram of a fitting curve of temperature versus NAS level according to an embodiment of the present invention;

[0043] Figure 5 It is a schematic diagram of a fitting curve of pressure corresponding to NAS level in an embodiment of the present invention;

[0044] Figure 6It is a structural schematic diagram of a hydraulic oil cleanliness monitoring device according to an embodiment of the present invention;

[0045] Figure 7 It is a schematic diagram of the structure of a controller in a hydraulic oil cleanliness monitoring device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0047] The technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0048] At present, many construction machinery use hydraulic oil systems. Take hydraulic excavators as an example. As an important construction and mining equipment, they play a very important role in the fields of engineering construction and ore mining. During the operation of the hydraulic oil system of the excavator, the particles generated by the wear of the components and the pollutants from the external environment will cause the hydraulic oil to be continuously contaminated. The contaminated hydraulic oil will aggravate the wear of the hydraulic components and even cause the components to be blocked and various hydraulic failures. Therefore, it is particularly important to monitor the cleanliness of the hydraulic oil.

[0049] In the prior art, the cleanliness of hydraulic oil is usually monitored through a cleanliness sensor, and a prompt to replace the hydraulic oil is issued when the cleanliness reaches a certain cleanliness threshold. Although this method can realize the monitoring of hydraulic oil, since the detection accuracy of the cleanliness sensor itself is easily affected by environmental factors, it can only realize rough monitoring, and the monitoring accuracy is limited, and it is difficult to reflect the true state of the hydraulic oil. In actual working conditions, since the true state of the current hydraulic oil cannot be obtained, it is only when it is prompted that the hydraulic oil needs to be replaced that it is known that the hydraulic oil no longer meets the operating requirements of the engineering machinery, which often affects the operation progress and operation arrangement of the engineering machinery. If the state of the hydraulic oil can be understood in real time during the operation of the engineering machinery, the engineering machinery can be flexibly arranged in advance to perform engineering operations, and it is also conducive to the maintenance and maintenance of the engineering machinery. Therefore, how to achieve accurate monitoring of the cleanliness of hydraulic oil has become a problem that needs to be solved urgently.

[0050] Based on the above problems, an embodiment of the present invention provides a hydraulic oil cleanliness monitoring device, which is applied to engineering machinery with a hydraulic oil system, such as Figure 1As shown, the hydraulic oil cleanliness monitoring device includes: a controller 4 and a cleanliness sensor 1, a pressure sensor 3 and a temperature sensor 2 arranged in the hydraulic oil circuit of the hydraulic oil system. In order to obtain more accurate monitoring results, in an embodiment of the present invention, the cleanliness sensor 1, the pressure sensor 3 and the temperature sensor 2 are arranged in the return tank pipeline in the hydraulic oil circuit.

[0051] The controller 4 is connected to the cleanliness sensor 1, the pressure sensor 3 and the temperature sensor 2 respectively; the cleanliness sensor 1 is used to collect the current cleanliness detection result of the return tank pipeline, the pressure sensor 3 is used to collect the current pressure of the return tank pipeline, and the temperature sensor 2 is used to collect the current temperature of the return tank pipeline; the controller 4 includes: a memory and a processor, the memory and the processor are connected to each other in communication, the memory stores computer instructions, and the processor executes the computer instructions to execute the hydraulic oil cleanliness monitoring method provided by another embodiment of the present invention. Specifically, the controller 4 is used to obtain the current cleanliness detection result collected by the cleanliness sensor 1 and the current pressure and current temperature of the return tank pipeline; based on the relationship between the current pressure and the preset pressure and the detection result and the relationship between the current temperature and the preset temperature and the detection result, the current cleanliness detection result is corrected; based on the corrected current cleanliness detection result, the current cleanliness level of the hydraulic oil in the hydraulic oil system is determined. In the embodiment of the present invention, the engineering machinery is described by taking an excavator as an example, and other specific structures of the excavator can refer to the relevant mechanical design of the excavator in the prior art, which will not be repeated here. It should be noted that in the embodiment of the present invention, the hydraulic oil cleanliness monitoring device includes: temperature sensor 2 and pressure sensor 3 as an example. Accordingly, the controller 4 simultaneously corrects the current cleanliness detection result according to the current pressure and the current temperature to achieve the best correction effect. In actual applications, the hydraulic oil cleanliness monitoring device may only include the temperature sensor 2. In this case, the controller 4 corrects the current cleanliness detection result according to the current temperature. Similarly, the hydraulic oil cleanliness monitoring device may only include the pressure sensor 3. In this case, the controller 4 corrects the current cleanliness detection result according to the current pressure. The above two technical solutions can also improve the accuracy of the current cleanliness detection result.

[0052] Among them, in the embodiment of the present invention, the cleanliness level is divided into cleanliness levels according to the pollution level classification standard of the NAS1638 standard. The cleanliness level is divided into 12 levels in total. The higher the level, the more serious the contamination of the surface hydraulic oil and the lower the cleanliness. In the embodiment of the present invention, a cleanliness sensor 1 is used to monitor the particulate contaminants of the hydraulic oil in real time, and to perform optical perspective on the particles, and then detect the shadow of the impurities passing in front of the light receiving part as a detection signal. Then the area of ​​the detected signal waveform is integrated. The value of the integral processing (voltage) is uploaded to the controller 4 through the sensor output. The principle of using it to detect the cleanliness level is to detect the number of 5-15μm impurities through a photoresistor, and use the calibration curve to convert it into the impurity concentration calculated by the limit value of the NAS level, and then determine the NAS cleanliness level based on the impurity concentration and the output voltage of the photosensitive sensor. The specific cleanliness level conversion process is a prior art, see the relevant description in the prior art for details, and will not be repeated here.

[0053] Specifically, in one embodiment, the above-mentioned memory is also used to store various data processed by the processor, so as to facilitate future troubleshooting and tracing of faults.

[0054] Through the coordinated cooperation of the above-mentioned components, the hydraulic oil cleanliness monitoring device provided in the embodiment of the present invention corrects the current cleanliness detection result of the cleanliness sensor by real-time monitoring of the pressure and temperature of the hydraulic oil circuit, thereby avoiding the problem that the cleanliness sensor is affected by external environmental interference and affects the detection result, improves the accuracy of the monitoring result, and can obtain an accurate cleanliness level of the hydraulic oil, making it easy to grasp the true state of the hydraulic oil, thereby realizing accurate monitoring of the cleanliness of the hydraulic oil.

[0055] Specifically, in one embodiment, the controller 4 controls the hydraulic oil system based on the current cleanliness level. The controller 4 determines whether the current cleanliness level reaches the first preset level; when the current cleanliness level reaches the first preset level, the hydraulic oil system is controlled to stop working. For example, the first preset level is level 12 of the NAS level. When the current cleanliness level received by the controller 4 is level 12, the hydraulic oil system is controlled to stop working, such as: the engineering machinery is prohibited from continuing to work by controlling the engine to stop, thereby protecting the hydraulic components from being damaged.

[0056] When the current cleanliness level does not reach the first preset level, it is determined whether the current cleanliness level reaches the second preset level. When the current cleanliness level reaches the second preset level, the operating power of the hydraulic oil system is limited. The cleanliness corresponding to the second preset level is better than the cleanliness corresponding to the first preset level. For example, the second preset level is NAS level 10 and 11. When the current cleanliness level received by the controller 4 is 10 or 11, the engine speed is limited by controlling the throttle actuator, and the main pump electric proportional valve is adjusted to ultimately limit the main pump power of the hydraulic system, thereby achieving the purpose of limiting the operating power of the hydraulic oil system, thereby delaying the downward trend of the cleanliness of the hydraulic oil and avoiding damage to hydraulic components due to excessive operating power.

[0057] In addition, if the current cleanliness level does not reach the second preset level, that is, the current cleanliness level of the hydraulic oil is at or below level 9 of the NAS level, it means that the hydraulic oil is in a normal and healthy state, and there is no need to replace the hydraulic oil, and the hydraulic system can operate normally. It should be noted that in the embodiment of the present invention, two preset levels are used as an example for explanation. In actual applications, multiple different preset levels can also be set according to the optimal working state of the hydraulic system under different hydraulic oil cleanliness conditions, and the hydraulic system can be controlled accordingly through the controller 4, and the present invention is not limited to this.

[0058] Specifically, in one embodiment, the above-mentioned hydraulic oil cleanliness monitoring device further includes: a result output device 8 connected to the controller 4, illustratively, such as Figure 1 As shown, in an embodiment of the present invention, the result output device 8 includes: a display screen 5 connected to the controller 4, and the display screen 5 is used to display the current cleanliness level. Specifically, the controller 4 and the display screen 5 are connected via a CAN bus. Exemplarily, when the NAS level is level 9 or below, the display screen 5 displays that the hydraulic oil is in a green healthy state; if the NAS level reaches level 10, the display screen 5 displays that the hydraulic oil is in a yellow state; if the NAS level reaches level 11, the display screen 5 displays that the hydraulic oil is in an orange state; if the NAS level reaches level 12, the display screen 5 displays that the hydraulic oil is in a red state. By displaying the current cleanliness level of the hydraulic oil on the display screen 5, it is convenient to prompt timely replacement of the hydraulic oil to avoid damage to the hydraulic components.

[0059] Specifically, in one embodiment, the above-mentioned result output device 8 also includes: an alarm connected to the controller 4 ( Figure 1(not shown), the controller 4 is used to drive the alarm to sound an alarm according to the current cleanliness level. Specifically, the alarm is a plurality of indicator lights, each indicator light is set in a one-to-one correspondence with the cleanliness level, and the controller 4 is used to drive the indicator light corresponding to the current cleanliness level to light up. In practical applications, the number of indicator lights can be set according to the actual alarm requirements. For example, when the alarm requires precision, an indicator light can be set for each cleanliness level, and when the alarm requirement is not high, multiple cleanliness levels can correspond to one indicator light. For example: NAS level 1-9 hydraulic oil has good cleanliness and does not need to be replaced. Therefore, these 9 levels can correspond to one indicator light. The cleanliness of 10-11 hydraulic oil is average and may need to be replaced after a period of use. Therefore, 10-11 corresponds to an indicator light to remind that the hydraulic oil will need to be replaced soon. Level 12 indicates that the hydraulic oil must be replaced, and corresponds to an indicator light to remind you to replace the hydraulic oil immediately to avoid damage to the hydraulic system. In addition, different hydraulic oil states can be indicated by using indicator lights of different colors. For example, when the NAS level is 9 or below, the indicator light is green, when the NAS level is 10-11, the indicator light is yellow, and when the NAS level is 12, the indicator light is red. The alarm levels are distinguished by colors for easy identification; and different alarm levels correspond to different alarm measures, which can ensure that the operator is urged to replace the hydraulic oil in time without damaging the hydraulic components. In addition, the above-mentioned alarm can also be a sound alarm such as a speaker, and the present invention is not limited to this.

[0060] Specifically, in one embodiment, if Figure 1 As shown, the above-mentioned result output device 8 also includes:

[0061] The server 6 and the mobile terminal 7 are connected in communication with the controller 4, and are used to receive the current cleanliness level sent by the controller 4, and send the current cleanliness level to the mobile terminal 7. Specifically, the mobile terminal 7 can be a terminal device corresponding to the operator of the engineering machinery and / or a terminal device corresponding to the maintenance personnel of the engineering machinery, such as a mobile phone, so that the operator or maintenance personnel can timely understand the state of the hydraulic oil, so as to better control the engineering machinery to perform engineering work or timely maintain and repair the engineering machinery, and finally realize remote operation and monitoring.

[0062] The present invention also provides a method for monitoring the cleanliness of hydraulic oil, which is applied to Figure 1 The controller 4 of the hydraulic oil cleanliness monitoring device shown in FIG. Figure 2 As shown, the hydraulic oil cleanliness monitoring method specifically includes the following steps:

[0063] Step S101: obtaining the current cleanliness detection result collected by the cleanliness sensor and the current pressure and current temperature of the hydraulic oil circuit.

[0064] Among them, the current pressure can be obtained by Figure 1 The current temperature can be acquired by the pressure sensor 3 shown, and the current temperature can be acquired by the temperature sensor 2. It should be noted that, in the embodiment of the present invention, the current cleanliness detection result is the voltage signal output by the cleanliness sensor 1.

[0065] Step S102: based on the relationship between the current pressure, the preset pressure and the detection result, and the relationship between the current temperature, the preset temperature and the detection result, the current cleanliness detection result is corrected.

[0066] Among them, the relationship between the preset pressure and the test result, as well as the relationship between the preset temperature and the test result, are fitting curves obtained in advance through experiments. Since the voltage output by the cleanliness sensor when detecting the hydraulic oil will fluctuate to a certain extent, it has been verified through experiments that the pressure and temperature of the hydraulic oil will have a certain degree of influence on the detection accuracy. Therefore, through laboratory bench tests, the influence curve of pressure and temperature on the test results is tested, and then the test results are corrected to eliminate the fluctuations in the test results.

[0067] It should be noted that in the embodiment of the present invention, in order to achieve the best correction effect and make the corrected current cleanliness detection result closer to the actual result, the current cleanliness detection result is corrected by using the current pressure and the current temperature as an example. In actual applications, only the current pressure or the current temperature can be used for correction, which can also achieve the purpose of improving the accuracy of the detection result. The present invention is not limited to this.

[0068] Step S103: Determine the current cleanliness level of the hydraulic oil in the hydraulic oil system based on the corrected current cleanliness detection result.

[0069] Among them, the current cleanliness level is the modified voltage signal converted into the corresponding NAS level.

[0070] By executing the above steps, the hydraulic oil cleanliness monitoring method provided by the embodiment of the present invention corrects the current cleanliness detection result of the cleanliness sensor by real-time monitoring of the pressure and temperature of the hydraulic oil circuit, thereby avoiding the problem that the cleanliness sensor is affected by external environmental interference and affects the detection result, improving the accuracy of the monitoring result, and obtaining an accurate cleanliness level of the hydraulic oil, which is convenient for grasping the true state of the hydraulic oil and realizing accurate monitoring of the cleanliness of the hydraulic oil.

[0071] Specifically, the influence of the above temperature and pressure on the output voltage value of the cleanliness sensor can be described as follows: Figure 3 The test bench is built according to the test principle diagram shown. Through the test, it can be seen that with the increase of temperature or pressure, the output voltage value of the cleanliness sensor increases accordingly, and the final converted NAS level is higher than the actual NAS level.

[0072] Among them, the fitting curve of temperature and NAS level is as follows Figure 4 As shown, the fitting curve can be expressed by the following formula: X = k × T + b, where X is the NAS level, k is a coefficient, T is the temperature, and b is a constant. Through correction, the influence of temperature on the NAS level needs to be eliminated, that is, X = C (C is a constant). The parameter values ​​of the fitting curve are, for example: at 30°C, the voltage value output by the cleanliness sensor (the voltage value can be converted into the NAS level) is 1500mv, and at 40°C, the voltage value output by the cleanliness sensor (the voltage value can be converted into the NAS level) is 1530mv, so that the fitting curve can be obtained.

[0073] Among them, the fitting curve of pressure and NAS level is as follows Figure 5 As shown, the fitting curve can be expressed by the following formula: Y = k × P + b, where Y is the NAS level, k is the coefficient, P is the pressure, and b is a constant. Through correction, the influence of pressure on the NAS level needs to be eliminated, that is, Y = C (C is a constant). The parameter values ​​of the fitting curve are, for example: at 30MPa, the voltage value output by the cleanliness sensor (the voltage value can be converted into the NAS level) is 1000mv, and at 31MPa, the voltage value output by the cleanliness sensor (the voltage value can be converted into the NAS level) is 1100mv, so that the fitting curve can be obtained.

[0074] Specifically, in one embodiment, the above step S103 specifically includes the following steps:

[0075] Step S201: Obtain the relationship between the preset detection result and the cleanliness level.

[0076] The relationship between the preset detection result and the cleanliness level is the corresponding relationship between the output voltage signal of the cleanliness sensor and the NAS level.

[0077] Step S202: Based on the relationship between the preset detection result and the cleanliness level, determine the current cleanliness level corresponding to the corrected current cleanliness detection result.

[0078] By correcting the output voltage value of the cleanliness sensor, the influence of temperature and pressure on the detection accuracy of the cleanliness sensor is eliminated, thereby ensuring the accuracy of the current cleanliness level and accurately indicating the current cleanliness status of the hydraulic oil.

[0079] Specifically, in one embodiment, the above-mentioned hydraulic oil cleanliness monitoring method further includes the following steps:

[0080] Step S104: Control the hydraulic oil system based on the current cleanliness level.

[0081] Specifically, by judging whether the current cleanliness level reaches the first preset level; when the current cleanliness level reaches the first preset level, the hydraulic oil system is controlled to stop working; when the current cleanliness level does not reach the first preset level, it is judged whether the current cleanliness level reaches the second preset level, and the cleanliness corresponding to the second preset level is better than the cleanliness corresponding to the first preset level; when the current cleanliness level reaches the second preset level, the operating power of the hydraulic oil system is limited. Specific content parameters The relevant description of the above hydraulic oil cleanliness detection device is not repeated here.

[0082] The hydraulic oil cleanliness monitoring method provided by the embodiment of the present invention will be described in detail below in conjunction with specific application examples.

[0083] The above hydraulic oil cleanliness monitoring method can be directly applied to existing hydraulic excavators, such as Figure 1 As shown, during the operation of the excavator, the cleanliness sensor 1 monitors the particle-shaped pollutants in the hydraulic oil in real time and converts them into voltage values ​​corresponding to the NAS level. The controller 4 corrects the voltage value for temperature and pressure according to the correction function.

[0084] If this correction value is less than the voltage value corresponding to NAS level 9, a signal indicating that the cleanliness level is within the standard is transmitted to display screen 5 via the CAN bus, and the level color is green;

[0085] If this correction value is greater than the voltage value corresponding to NAS level 10, an alarm prompt indicating that the cleanliness exceeds the standard is transmitted to the display screen 5 via the CAN bus, the level color is yellow and the engine speed is reduced;

[0086] If this correction value is greater than the voltage value corresponding to NAS level 11, an alarm prompt indicating that the cleanliness exceeds the standard is transmitted to the display screen 5 through the CAN bus, the level color is orange and the main pump power is reduced;

[0087] If this correction value is greater than the voltage value corresponding to NAS level 12, the alarm prompt of excessive cleanliness will be transmitted to the display screen 5 through the CAN bus, the level color will be red and the machine will be prohibited from continuing to work to protect the hydraulic components.

[0088] Therefore, the cleanliness of the hydraulic oil can be accurately monitored by real-time correction of the voltage value output by the hydraulic oil sensor. Different alarm levels are used to correspond to different alarm measures to ensure that the operator is urged to replace the hydraulic oil without damaging the hydraulic components.

[0089] By executing the above steps, the hydraulic oil cleanliness monitoring method provided by the embodiment of the present invention corrects the current cleanliness detection result of the cleanliness sensor by real-time monitoring of the pressure and temperature of the hydraulic oil circuit, thereby avoiding the problem that the cleanliness sensor is affected by external environmental interference and affects the detection result, improving the accuracy of the monitoring result, and obtaining an accurate cleanliness level of the hydraulic oil, which is convenient for grasping the true state of the hydraulic oil and realizing accurate monitoring of the cleanliness of the hydraulic oil.

[0090] The present invention also provides a hydraulic oil cleanliness monitoring device, which is used in Figure 1 The controller of the hydraulic oil cleanliness monitoring device shown in FIG. Figure 6 As shown, the hydraulic oil cleanliness monitoring device specifically includes:

[0091] The acquisition module 101 is used to acquire the current cleanliness detection result collected by the cleanliness sensor and the current pressure and current temperature of the hydraulic oil circuit. For details, please refer to the relevant description of step S101 in the above method embodiment, which will not be repeated here.

[0092] The first processing module 102 is used to correct the current cleanliness test result based on the relationship between the current pressure, the preset pressure and the test result, and the relationship between the current temperature, the preset temperature and the test result. For details, please refer to the relevant description of step S102 in the above method embodiment, which will not be repeated here.

[0093] The second processing module 103 is used to determine the current cleanliness level of the hydraulic oil in the hydraulic oil system based on the corrected current cleanliness detection result. For details, please refer to the relevant description of step S103 in the above method embodiment, which will not be repeated here.

[0094] The hydraulic oil cleanliness monitoring device provided in the embodiment of the present invention is used to execute the hydraulic oil cleanliness monitoring method provided in the above embodiment. Its implementation method and principle are the same. For details, please refer to the relevant description of the above method embodiment and will not be repeated here.

[0095] Through the coordinated cooperation of the above-mentioned components, the hydraulic oil cleanliness monitoring device provided in the embodiment of the present invention corrects the current cleanliness detection result of the cleanliness sensor by real-time monitoring of the pressure and temperature of the hydraulic oil circuit, thereby avoiding the problem that the cleanliness sensor is affected by external environmental interference and affects the detection result, improving the accuracy of the monitoring result, and obtaining an accurate cleanliness level of the hydraulic oil, which is convenient for grasping the true state of the hydraulic oil and realizing accurate monitoring of the cleanliness of the hydraulic oil.

[0096] The embodiment of the present invention also provides a hydraulic oil cleanliness monitoring device, which can be specifically referred to as Figure 1 Hydraulic oil cleanliness monitoring equipment such as Figure 7As shown, the controller in the hydraulic oil cleanliness monitoring device includes: a processor 901 and a memory 902, wherein the processor 901 and the memory 902 can be connected via a bus or other means. Figure 7 The example of connecting through bus is taken in the following.

[0097] The processor 901 may be a central processing unit (CPU). The processor 901 may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or a combination of the above chips.

[0098] The memory 902 is a non-transitory computer-readable storage medium that can be used to store non-transitory software programs, non-transitory computer executable programs and modules, such as program instructions / modules corresponding to the methods in the above method embodiments. The processor 901 executes various functional applications and data processing of the processor by running the non-transitory software programs, instructions and modules stored in the memory 902, that is, implementing the methods in the above method embodiments.

[0099] The memory 902 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required by at least one function; the data storage area may store data created by the processor 901, etc. In addition, the memory 902 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory 902 may optionally include a memory remotely arranged relative to the processor 901, and these remote memories may be connected to the processor 901 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0100] One or more modules are stored in the memory 902 , and when executed by the processor 901 , the method in the above method embodiment is executed.

[0101] The specific details of the above-mentioned controller can be understood by referring to the corresponding related descriptions and effects in the above-mentioned method embodiment, and will not be repeated here.

[0102] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program, and the implemented program can be stored in a computer-readable storage medium, and when the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, the storage medium can be a disk, an optical disk, a read-only memory (ROM), a random access memory (RAM), a flash memory, a hard disk drive (HDD) or a solid-state drive (SSD), etc.; the storage medium can also include a combination of the above-mentioned types of memory.

[0103] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A method for monitoring the cleanliness of hydraulic oil, applied to a hydraulic oil system, wherein a cleanliness sensor is provided in the hydraulic oil circuit of the hydraulic oil system, characterized in that: The method comprises: Acquire the current cleanliness detection result collected by the cleanliness sensor and the current pressure and / or current temperature of the hydraulic oil circuit; Based on the relationship between the current pressure and the preset pressure and the test result and / or the relationship between the current temperature and the preset temperature and the test result, the current cleanliness test result is corrected. The relationship between the preset pressure and the test result and the relationship between the preset temperature and the test result are determined by testing the influence curve of pressure and temperature on the test result through bench tests in the laboratory; Obtaining the relationship between the preset test result and the cleanliness level; based on the relationship between the preset test result and the cleanliness level, determining the current cleanliness level corresponding to the corrected current cleanliness test result, wherein the cleanliness level is set according to the optimal state of the hydraulic system under different hydraulic oil cleanliness states.

2. The method according to claim 1, characterized in that Also includes: The hydraulic oil system is controlled based on the current cleanliness level.

3. The method according to claim 1, characterized in that The controlling the hydraulic oil system based on the current cleanliness level includes: Determining whether the current cleanliness level reaches a first preset level; When the current cleanliness level reaches the first preset level, the hydraulic oil system is controlled to stop working.

4. The method according to claim 3, characterized in that When the current cleanliness level does not reach the first preset level, determining whether the current cleanliness level reaches a second preset level, the cleanliness corresponding to the second preset level being better than the cleanliness corresponding to the first preset level; When the current cleanliness level reaches the second preset level, the operating power of the hydraulic oil system is limited.

5. A hydraulic oil cleanliness monitoring device, applied to a hydraulic oil system, wherein a cleanliness sensor is provided in the hydraulic oil circuit of the hydraulic oil system, characterized in that: The device comprises: An acquisition module, used to acquire the current cleanliness detection result collected by the cleanliness sensor and the current pressure and / or current temperature of the hydraulic oil circuit; A first processing module, for correcting the current cleanliness test result based on a relationship between a current pressure and a preset pressure and a test result and / or a relationship between a current temperature and a preset temperature and a test result, wherein the relationship between the preset pressure and the test result and the relationship between the preset temperature and the test result are determined by testing a curve of the influence of pressure and temperature on the test result through a bench test in a laboratory; The second processing module is used to obtain the relationship between the preset detection result and the cleanliness level; based on the relationship between the preset detection result and the cleanliness level, determine the current cleanliness level corresponding to the corrected current cleanliness detection result, and the cleanliness level is set according to the optimal state of the hydraulic system under different hydraulic oil cleaning states.

6. A hydraulic oil cleanliness monitoring device, applied to a hydraulic oil system, characterized in that: The hydraulic oil cleanliness monitoring device comprises: a controller and a cleanliness sensor, a pressure sensor and / or a temperature sensor arranged in the hydraulic oil circuit of the hydraulic oil system, wherein: The controller is respectively connected to the cleanliness sensor, the pressure sensor and / or the temperature sensor; The cleanliness sensor is used to collect the current cleanliness detection result of the hydraulic oil circuit, the pressure sensor is used to collect the current pressure of the hydraulic oil circuit, and the temperature sensor is used to collect the current temperature of the hydraulic oil circuit; The controller includes: a memory and a processor, the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the method according to any one of claims 1 to 4 by executing the computer instructions.

7. The hydraulic oil cleanliness monitoring device according to claim 6, characterized in that: Also includes: A result output device connected to the controller, wherein the result output device is used to output the current cleanliness level.

8. The hydraulic oil cleanliness monitoring device according to claim 7, characterized in that: The result output device comprises: an alarm connected to the controller, the controller being used to drive the alarm to sound an alarm according to the current cleanliness level; and / or A display screen connected to the controller, wherein the display screen is used to output the current cleanliness level.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the method according to any one of claims 1 to 4.

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