Method and device for predicting service life of rotating part of supercharger of diesel engine

Abstract

The invention relates to the technical field of locomotive diesel engine equipment, in particular to a method and device for predicting the service life of a rotating part of a diesel engine supercharger, and the method comprises the steps: obtaining the first remaining service life of the rotating part of the supercharger through accounting according to the turbine inlet temperature according to a first formula; according to a second formula, obtaining a second remaining service life of the supercharger rotating part accounting according to the rotating speed of the supercharger; according to a third formula, obtaining a third residual service life of the supercharger rotating piece accounting according to the pressure of the engine oil inlet of the supercharger; and obtaining the remaining service life of the supercharger rotating part according to a fourth formula. According to the method for predicting the service life of the rotating part of the supercharger of the diesel engine, the service life of the rotating part of the supercharger can be predicted in real time, necessary maintenance and overhaul can be carried out on the supercharger in time, the fault rate and the fault influence of the rotating part of the supercharger are reduced, and therefore the safety of the diesel engine is improved, and the operation and maintenance cost is reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of locomotive diesel engine equipment, and in particular to a method and device for predicting the life of a diesel engine supercharger rotating part. Background Art

[0002] Locomotive diesel engine superchargers are divided into two structures: radial flow type and axial flow type. Both structures of superchargers contain rotating parts. As the core components of the supercharger, the rotating parts directly affect the performance and service life of the supercharger. The supercharger is installed on the terminal pipeline of the diesel engine exhaust system. It uses the exhaust gas energy discharged from the combustion in the diesel engine cylinder to drive the rotating parts inside the supercharger to rotate, and compress the air for combustion in the cylinder. The working environment of the diesel engine supercharger, especially the internal rotating parts, is very harsh. During the working process, it is subjected to the impact of high-temperature and high-pressure airflow. At the same time, under the action of its own high-speed rotation, it is also subjected to high-frequency vibration and centrifugal reaction force creep. During the use of locomotive diesel engines, due to changes in line and environmental conditions, the traction conditions change frequently, and the rotating parts of the supercharger are subjected to fatigue creep caused by temperature alternation, speed alternation, vibration alternation, etc.

[0003] The working conditions and service life of the supercharger rotating parts under these conditions are specified during type design, material selection, heat treatment and processing and manufacturing. In actual use, the maintenance method of the locomotive diesel engine supercharger rotating parts is to repair after a fault occurs (such as foreign matter damaging the rotating parts, oil outage and high temperature burning the rotating parts, etc.) and update according to the normal maintenance process of the locomotive (i.e. a certain operating time or running mileage). The actual working conditions of the rotating parts are not monitored and regulated, nor is their actual working time truly counted. Therefore, it is impossible to accurately and effectively ensure the reliability of the use of the supercharger rotating parts, nor is it possible to evaluate the service life of the supercharger rotating parts in real time.

[0004] The failure of the supercharger rotating parts will cause problems such as supercharger scavenging, oil leakage, gas leakage, etc., which will directly affect the performance of the diesel engine and also pose a great safety hazard. At the least, it will cause the diesel engine to reduce power or shut down, and at the worst, it will cause a fire accident. Because the supercharger rotating parts are precision components inside the supercharger, and are affected by external operating conditions and their own quality, there is currently no effective means to monitor the operating status of the supercharger rotating parts, and its operating reliability cannot be guaranteed. The hidden dangers of failure cannot be warned in advance for maintenance to reduce the impact of the failure. The current planned maintenance method that is updated according to the normal inspection and repair process has certain inaccuracies and cannot truly reflect the operating status of the supercharger rotating parts, resulting in a large bottleneck in the precise operation and maintenance, cost control, and reliable operation of diesel engines.

[0005] Therefore, the prior art needs to be improved. Summary of the invention

[0006] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a method and device for predicting the life of a diesel engine supercharger rotating part. The method realizes the prediction of the life of the supercharger rotating parts, reduces the failure rate and failure impact of the supercharger rotating parts, and thus improves the availability and operation and maintenance costs of the diesel engine.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions: According to one aspect of the present invention, a method for predicting the life of a rotating part of a diesel engine supercharger is provided, comprising: The first remaining service life of the supercharger rotating part calculated according to the supercharger turbine inlet temperature is obtained according to the first formula, the first formula including: ty1=t-t1-tx1 and tx1=(t / n1)m1; The second remaining service life of the supercharger rotating part calculated according to the supercharger speed is obtained according to the second formula, the second formula includes: ty2=t-t2-tx2 and tx2=(t / n2)m2; The third remaining service life of the supercharger rotating part calculated according to the supercharger oil inlet pressure is obtained according to the third formula, and the third formula includes: ty3=t-t3-tx3 and tx3=(t / n3)m3; Based on the first remaining service life, the second remaining service life and the third remaining service life, the remaining service life of the supercharger rotating part is obtained according to a fourth formula, and the fourth formula includes:

[0008] in: ty1 is the first remaining service life, t is the theoretical service life of the supercharger rotating parts under normal conditions, t1 is the service time of the supercharger rotating parts under normal supercharger turbine inlet temperature conditions, tx1 is the equivalent service time of the supercharger rotating parts under high supercharger turbine inlet temperature conditions, n1 is the theoretical service life of the supercharger rotating parts under high supercharger turbine inlet temperature conditions, and m1 is the service time of the supercharger rotating parts under high supercharger turbine inlet temperature conditions; ty2 is the second remaining service life, t2 is the use time of the supercharger rotating parts under the normal supercharger speed state, tx2 is the equivalent use time of the supercharger rotating parts under the high supercharger speed state, n2 is the theoretical service life of the supercharger rotating parts under the high supercharger speed state, and m2 is the use time of the supercharger rotating parts under the high supercharger speed state; ty3 is the third remaining service life, t3 is the service time of the supercharger rotating parts under the normal supercharger oil inlet pressure state, tx3 is the equivalent service time of the supercharger rotating parts under the low supercharger oil inlet pressure state, n3 is the theoretical service life of the supercharger rotating parts under the low supercharger oil inlet pressure state, and m3 is the service time of the supercharger rotating parts under the low supercharger oil inlet pressure state; ty is the remaining service life of the supercharger rotating parts, w1 is the weighted coefficient of the influence of the supercharger turbine inlet temperature on the service life, w2 is the weighted coefficient of the influence of the supercharger speed on the service life, and w3 is the weighted coefficient of the influence of the supercharger oil inlet pressure on the service life.

[0009] In one embodiment of the present invention, The conditions for determining the normal state include: the turbocharger turbine inlet temperature T is less than T1, the turbocharger speed N is less than N1, and the turbocharger oil inlet pressure P is greater than P1; The normal supercharger turbine inlet temperature state determination conditions include: the supercharger turbine inlet temperature T is less than T1; The high supercharger turbine inlet temperature state determination conditions include: the supercharger turbine inlet temperature T is greater than T1 and less than T2; The normal supercharger speed state determination conditions include: the supercharger speed N is less than N1; The high supercharger speed state determination conditions include: the supercharger speed N is greater than N1 and less than N2; The normal supercharger oil inlet pressure state determination conditions include: the supercharger oil inlet pressure P is greater than P1; The low supercharger oil inlet pressure state determination conditions include: the supercharger oil inlet pressure P is less than P1 and greater than P2; Among them, T1 is the normal threshold of supercharger turbine inlet temperature, N1 is the normal threshold of supercharger speed, P1 is the normal threshold of supercharger oil inlet pressure, T2 is the high threshold of supercharger turbine inlet temperature, N2 is the high threshold of supercharger speed, P2 is the low threshold of supercharger oil inlet pressure, and T1<T2, N1<N2, P1>P2.

[0010] In one embodiment of the present invention, the theoretical service life t of the supercharger rotating part in a normal state is obtained by a first test method, and the first test method includes: When the supercharger turbine inlet temperature T is lower than T1 and the supercharger oil inlet pressure P is higher than P1, the supercharger speed N is cyclically changed in the range of 0 to N1, and the time from the start of the first test to the failure of the supercharger rotating parts is obtained as the theoretical service life t of the supercharger rotating parts in normal state.

[0011] In one embodiment of the present invention, the theoretical service life n1 of the supercharger rotating part under the high supercharger turbine inlet temperature state is obtained by a second test method, and the second test method includes: When the supercharger speed N is lower than N1 and the supercharger oil inlet pressure P is higher than P1, the supercharger turbine inlet temperature T changes cyclically within the range of T1 to T2, and the time from the start of the second test to the failure of the supercharger rotating parts is obtained as the theoretical service life n1 of the supercharger rotating parts under the high turbine inlet temperature state.

[0012] In one embodiment of the present invention, the theoretical service life n2 of the supercharger rotating part under the high supercharger speed state is obtained by a third test method, and the third test method includes: When the supercharger turbine inlet temperature T is lower than T1 and the supercharger oil inlet pressure P is higher than P1, the supercharger speed N is cyclically changed in the range of N1 to N2, and the time from the start of the third test to the failure of the supercharger rotating parts is obtained as the theoretical service life n2 of the supercharger rotating parts under high supercharger speed state.

[0013] In one embodiment of the present invention, the theoretical service life of the supercharger rotating parts under the low supercharger oil inlet pressure state is obtained by a fourth test method, and the fourth test method includes: When the supercharger turbine inlet temperature T is lower than T1 and the supercharger speed is lower than N1, the supercharger oil inlet pressure is cyclically changed in the range of P1 to P2, and the time from the start of the fourth test to the failure of the supercharger rotating parts is obtained as the theoretical service life n3 of the supercharger rotating parts under the low supercharger oil inlet pressure state.

[0014] In one embodiment of the present invention, The weighted coefficient of the turbocharger turbine inlet temperature on the service life is: w1=n1 / (n1+n2+n3), The weighted coefficient of the supercharger speed on the service life is: w2=n2 / (n1+n2+n3), Weighted coefficient of the influence of supercharger oil inlet pressure on service life: w3=n3 / (n1+n2+n3).

[0015] According to another aspect of the present invention, a device for predicting the life of a rotating part of a diesel engine supercharger is provided, comprising: a data acquisition unit and a data analysis and processing unit, the data acquisition unit is used to collect operating data of the supercharger and transmit the collected operating data to the data analysis and processing unit, the data analysis and processing unit adopts the above method according to the operating data, and obtains the remaining service life of the rotating part of the supercharger through calculation, the operating data comprising: supercharger turbine inlet temperature T, supercharger speed N and supercharger oil inlet pressure P.

[0016] In one embodiment of the present invention, the data acquisition unit includes a turbine inlet temperature sensor, a supercharger speed sensor and a supercharger oil inlet pressure sensor, which are used to respectively collect the supercharger turbine inlet temperature T, the supercharger speed N and the supercharger oil inlet pressure P of the supercharger.

[0017] In one embodiment of the present invention, the device further comprises a display unit, which is connected to the data analysis and processing unit to display the remaining service life of the supercharger rotating part calculated by the data analysis and processing unit.

[0018] Beneficial effects of the present invention: By monitoring the operating status of the supercharger, the service life of the supercharger rotating parts can be predicted in real time, so that the necessary maintenance and overhaul of the supercharger can be carried out in time, reducing the failure rate and impact of the supercharger rotating parts, thereby improving the safety of the diesel engine and reducing operation and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A topological diagram showing the diesel engine supercharger rotating parts life prediction method provided by the present invention; Figure 2 A schematic diagram of a diesel engine supercharger rotating part life prediction device provided by the present invention is shown. DETAILED DESCRIPTION

[0020] It should be understood that the embodiments of the present invention shown in the exemplary embodiments are only illustrative. Although only a few embodiments are described in detail in the present invention, it is easy for those skilled in the art to appreciate that multiple modifications are feasible without actually departing from the teaching of the subject matter of the present invention. Accordingly, all such modifications should be included within the scope of the present invention. Without departing from the gist of the present invention, other replacements, modifications, changes and deletions may be made to the design, operating conditions and parameters of the following exemplary embodiments.

[0021] like Figure 1 As shown, the present invention provides a method for predicting the life of a diesel engine supercharger rotating part, comprising: obtaining a first remaining service life of a supercharger rotating part calculated according to a supercharger turbine inlet temperature according to a first formula, the first formula comprising: ty1=t-t1-tx1 and tx1=(t / n1)m1; The second remaining service life of the supercharger rotating part calculated according to the supercharger speed is obtained according to the second formula, the second formula includes: ty2=t-t2-tx2 and tx2=(t / n2)m2; The third remaining service life of the supercharger rotating part calculated according to the supercharger oil inlet pressure is obtained according to the third formula, and the third formula includes: ty3=t-t3-tx3 and tx3=(t / n3)m3; Based on the first remaining service life, the second remaining service life, and the third remaining service life, the remaining service life of the supercharger rotating part is obtained according to a fourth formula, and the fourth formula includes:

[0022] Wherein: ty1 is the first remaining service life, t is the theoretical service life of the supercharger rotating parts under normal conditions, t1 is the use time of the supercharger rotating parts under normal supercharger turbine inlet temperature, tx1 is the equivalent use time of the supercharger rotating parts under high supercharger turbine inlet temperature, n1 is the theoretical service life of the supercharger rotating parts under high supercharger turbine inlet temperature, m1 is the use time of the supercharger rotating parts under high supercharger turbine inlet temperature; ty2 is the second remaining service life, t2 is the use time of the supercharger rotating parts under normal supercharger speed, tx2 is the equivalent use time of the supercharger rotating parts under high supercharger speed, n2 is the theoretical service life of the supercharger rotating parts under high supercharger speed , m2 is the usage time of the supercharger rotating parts under high supercharger speed; ty3 is the third remaining service life, t3 is the usage time of the supercharger rotating parts under normal supercharger oil inlet pressure, tx3 is the equivalent usage time of the supercharger rotating parts under low supercharger oil inlet pressure, n3 is the theoretical service life of the supercharger rotating parts under low supercharger oil inlet pressure, m3 is the usage time of the supercharger rotating parts under low supercharger oil inlet pressure; ty is the remaining service life of the supercharger rotating parts, w1 is the weighted coefficient of the influence of the supercharger turbine inlet temperature on the service life, w2 is the weighted coefficient of the influence of the supercharger speed on the service life, and w3 is the weighted coefficient of the influence of the supercharger oil inlet pressure on the service life.

[0023] The above technical solution of the present invention realizes the real-time prediction of the service life of the rotating parts of the supercharger, so that the necessary maintenance and overhaul of the supercharger can be carried out in time, and the failure rate and failure impact of the rotating parts of the supercharger can be reduced, thereby improving the safety of the diesel engine and reducing the operation and maintenance costs.

[0024] In the above method, The conditions for determining the normal state include: the turbocharger turbine inlet temperature T is less than T1, the turbocharger speed N is less than N1, and the turbocharger oil inlet pressure P is greater than P1; The normal supercharger turbine inlet temperature state determination conditions include: the supercharger turbine inlet temperature T is less than T1; The high supercharger turbine inlet temperature state determination conditions include: the supercharger turbine inlet temperature T is greater than T1 and less than T2; The normal supercharger speed state determination conditions include: the supercharger speed N is less than N1; The high supercharger speed state determination conditions include: the supercharger speed N is greater than N1 and less than N2; The normal supercharger oil inlet pressure state determination conditions include: the supercharger oil inlet pressure P is greater than P1; The low supercharger oil inlet pressure state determination conditions include: the supercharger oil inlet pressure P is less than P1 and greater than P2; Among them, T1 is the normal threshold of supercharger turbine inlet temperature, N1 is the normal threshold of supercharger speed, P1 is the normal threshold of supercharger oil inlet pressure, T2 is the high threshold of supercharger turbine inlet temperature, N2 is the high threshold of supercharger speed, P2 is the low threshold of supercharger oil inlet pressure, and T1<T2, N1<N2, P1>P2.

[0025] In the above method, the theoretical service life t of the supercharger rotating part in a normal state is obtained by a first test method, and the first test method includes: When the supercharger turbine inlet temperature T is lower than T1 and the supercharger oil inlet pressure P is higher than P1, the supercharger speed N is cyclically changed in the range of 0 to N1, and the time from the start of the first test to the failure of the supercharger rotating parts is obtained as the theoretical service life t of the supercharger rotating parts in normal state.

[0026] In the above method, the theoretical service life n1 of the supercharger rotating parts under the high supercharger turbine inlet temperature state is obtained by the second test method, and the second test method includes: When the supercharger speed N is lower than N1 and the supercharger oil inlet pressure P is higher than P1, the supercharger turbine inlet temperature T changes cyclically within the range of T1 to T2, and the time from the start of the second test to the failure of the supercharger rotating parts is obtained as the theoretical service life n1 of the supercharger rotating parts under the high turbine inlet temperature state.

[0027] In the above method, the theoretical service life n2 of the supercharger rotating parts under high supercharger speed state is obtained by the third test method, and the third test method includes: When the supercharger turbine inlet temperature T is lower than T1 and the supercharger oil inlet pressure P is higher than P1, the supercharger speed N is cyclically changed in the range of N1 to N2, and the time from the start of the third test to the failure of the supercharger rotating parts is obtained as the theoretical service life n2 of the supercharger rotating parts under high supercharger speed state.

[0028] In the above method, the theoretical service life of the supercharger rotating parts under the low supercharger oil inlet pressure state is obtained by the fourth test method, and the fourth test method includes: When the supercharger turbine inlet temperature T is lower than T1 and the supercharger speed is lower than N1, the supercharger oil inlet pressure is cyclically changed in the range of P1 to P2, and the time from the start of the fourth test to the failure of the supercharger rotating parts is obtained as the theoretical service life n3 of the supercharger rotating parts under the low supercharger oil inlet pressure state.

[0029] In the above method, The weighted coefficient of the turbocharger turbine inlet temperature on the service life is: w1=n1 / (n1+n2+n3), The weighted coefficient of the supercharger speed on the service life is: w2=n2 / (n1+n2+n3), Weighted coefficient of the influence of supercharger oil inlet pressure on service life: w3=n3 / (n1+n2+n3).

[0030] In addition, if Figure 2 As shown, the present invention provides a device for predicting the life of a rotating part of a diesel engine supercharger, comprising: a data acquisition unit and a data analysis and processing unit, the data acquisition unit is used to collect operating data of the supercharger, and transmit the collected operating data to the data analysis and processing unit, the data analysis and processing unit adopts the above method according to the operating data, and obtains the remaining service life of the rotating part of the supercharger through calculation, the operating data includes: supercharger turbine inlet temperature T, supercharger speed N and supercharger oil inlet pressure P.

[0031] In the above device, the data acquisition unit includes a turbine inlet temperature sensor, a supercharger speed sensor and a supercharger oil inlet pressure sensor, which are used to respectively collect the supercharger turbine inlet temperature T, supercharger speed N and supercharger oil inlet pressure P of the supercharger.

[0032] The above device further comprises a display unit, which is connected to the data analysis and processing unit and is used to display the remaining service life of the supercharger rotating part calculated by the data analysis and processing unit.

[0033] Example: Figure 1 The topological diagram of the method for predicting the life of the rotating parts of a diesel engine supercharger is shown. In order to realize the prediction method shown in the topological diagram, the following is designed: Figure 2 The prediction device shown adopts a 32-bit high-speed single-chip microcomputer system (hereinafter referred to as the "system device"), which integrates a 24V regulated power supply conversion module, a data acquisition unit, a data analysis and processing unit, a data storage unit, a data sending unit, and a data display unit. The system hardware realizes parameter early warning, power reduction and shutdown protection functions, data acquisition and processing functions, data storage functions, remaining service life evaluation functions, and data sending and transmission functions through software programs.

[0034] The system device is powered by an external 110V DC power supply. The system device is provided with a power supply interface, and a 24V regulated power conversion module is integrated inside it, which powers all integrated modules of the system device after conversion.

[0035] The output signals of the turbine inlet temperature sensor and the supercharger oil inlet pressure sensor are usually 4-20mA current signals or 0-5V voltage signals, and the sensors are active sensors that require external power supply or are directly powered by the system device. The supercharger speed sensor is a magnetoelectric sensor, and the output signal is usually an electric potential signal. It directly converts the mechanical energy of the measured object into an electrical signal output. It is a passive sensor and does not require external power supply. The data acquisition unit integrated in the system device needs to power the active sensor and convert the electrical signal output by the sensor into an analog signal and send it to the data analysis and processing unit. The data acquisition unit generally uses electronic chips or integrated circuit boards with strong filtering and anti-interference capabilities.

[0036] The system device integrates a data analysis and processing unit, and an integrated circuit board customized according to the design function requirements can be selected to analyze and process the data of the data acquisition unit. The data analysis and processing unit is designed with system software. A two-level threshold analysis and processing mechanism is designed in the software. The first level is the normal threshold value T1 of the turbocharger turbine inlet temperature, the normal threshold value N1 of the turbocharger speed, and the normal threshold value P1 of the turbocharger oil inlet pressure. The second level is the high threshold value T2 of the turbocharger turbine inlet temperature, the high threshold value N2 of the turbocharger speed, and the low threshold value P2 of the turbocharger oil inlet pressure. When the three indicators of the turbocharger are lower than T1, lower than N1, and higher than P1, the turbocharger is in a normal state; when the three indicators are between T1~T2, N1~N2, and P1~P2, the turbocharger is in a high-load working state; when the three indicators are higher than T2, higher than N2, and lower than P2, the turbocharger is in a prohibited working state, and the diesel engine control system executes a shutdown command at this time. T2, N2, and P2 are the maximum allowable operating indicators of the supercharger; T1 and N1 are 85% to 90% of the maximum allowable operating indicators. , P1 is 110% to 115% of the maximum allowable operating indicators.

[0037] The system software of the data analysis and processing unit is designed with an analysis and statistics function for the collected data, including statistics on the time t1, t2, t3 of the normal working state and the time m1, m2, m3 of the high-load working state.

[0038] The system software of the data analysis and processing unit is designed with a function to predict the remaining service life of the supercharger rotating parts. The specific algorithm is as follows: a) ty1 = t-t1-tx1 tx1=(t / n1)m1 Wherein, t is the theoretical service life (time) of the supercharger rotating parts under normal conditions, n1 is the theoretical service life (time) of the supercharger rotating parts under high supercharger turbine inlet temperature conditions, t1 is the use time of the supercharger rotating parts under normal supercharger turbine inlet temperature conditions, m1 is the use time of the supercharger rotating parts under high supercharger turbine inlet temperature conditions, tx1 is the converted use time of the supercharger rotating parts under high supercharger turbine inlet temperature conditions, and ty1 is the first remaining service life (time) of the supercharger rotating parts calculated according to the supercharger turbine inlet temperature.

[0039] b) ty2 = t-t2-tx2 TX2=(T / N2)M2 Wherein t is the theoretical service life (time) of the supercharger rotating parts under normal conditions, n2 is the theoretical service life (time) of the supercharger rotating parts under high supercharger speed conditions, t2 is the use time of the supercharger rotating parts under normal supercharger speed conditions, m2 is the use time of the supercharger rotating parts under high supercharger speed conditions, tx2 is the converted use time of the supercharger rotating parts under high supercharger speed conditions, and ty2 is the second remaining service life (time) of the supercharger rotating parts calculated according to the supercharger speed.

[0040] c) ty3 = t-t3-tx3 TX3 = (T / N3) m3 Wherein, t is the theoretical service life (time) of the supercharger rotating parts under normal conditions, n3 is the theoretical service life (time) of the supercharger rotating parts under low supercharger oil inlet pressure conditions, t3 is the use time of the supercharger rotating parts under normal supercharger oil inlet pressure conditions, m3 is the use time of the supercharger rotating parts under low supercharger oil inlet pressure conditions, tx3 is the converted use time of the supercharger rotating parts under low supercharger oil inlet pressure conditions, and ty3 is the third remaining service life (time) of the supercharger rotating parts calculated according to the supercharger oil inlet pressure.

[0041] d)

[0042] Wherein ty1 is the first remaining service life (time), ty2 is the second remaining service life (time), ty3 is the third remaining service life (time), ty is the remaining service life (time) of the supercharger rotating parts, w1 is the weighted coefficient of the influence of the turbine inlet temperature on the service life, w2 is the weighted coefficient of the influence of the supercharger speed on the service life, and w3 is the weighted coefficient of the influence of the supercharger oil inlet pressure on the service life.

[0043] The theoretical service life (time) t, n1, n2, n3 of the supercharger under various conditions stored in the system software of the data analysis and processing unit, as well as the weighted coefficients w1, w2, w3 affecting the service life of the supercharger rotating parts, can be determined through the supercharger reliability growth test (RGT), as follows: 1) Use the first test method to obtain the theoretical service life (time) t of the supercharger in normal state: Specific implementation process: select multiple models of supercharger samples for testing, usually use supercharger speed as the basic variable of load alternation, supercharger speed N is in the range of 0 ~ N1, every 10 minutes of operation, supercharger speed N increases by 2000 rpm, N gradually increases from 0 to N1, and then continues to start the next same cycle. During the test, the supercharger turbine inlet temperature T is strictly controlled to be lower than T1 and the supercharger oil inlet pressure P is higher than P1, until the supercharger rotating parts fail. The test time of multiple superchargers is counted, and the average value is taken as the theoretical service life (time) t of the supercharger in normal state.

[0044] 2) The second test method is used to obtain the theoretical service life (time) n1 of the supercharger rotating parts at high supercharger turbine inlet temperature: Specific implementation process: select multiple models of supercharger samples for testing. The supercharger turbine inlet temperature T is within the range of T1 to T2. Every 10 minutes of operation, the supercharger turbine inlet temperature T increases by 5°C. After T gradually increases from T1 to T2, the next identical cycle begins. During the test, the supercharger speed N is strictly controlled to be lower than T1 and the supercharger oil inlet pressure P is higher than P1 until the supercharger rotating parts fail. The test time of multiple superchargers is counted and the average value is taken as the theoretical service life (time) n1 of the supercharger rotating parts under high turbine inlet temperature state.

[0045] 3) The third test method is used to obtain the theoretical service life (time) n2 of the supercharger rotating parts at high supercharger speed: Specific implementation process: select multiple models of supercharger samples for testing. The supercharger speed N is in the range of N1 to N2. Every 10 minutes of operation, the supercharger speed N increases by 2000 rpm. After N is gradually increased from N1 to N2, the next identical cycle begins. During the test, the supercharger turbine inlet temperature T is strictly controlled to be lower than T1 and the supercharger oil inlet pressure P is higher than P1 until the supercharger rotating parts fail. The test time of multiple superchargers is counted and the average value is taken as the theoretical service life (time) n2 of the supercharger rotating parts under high supercharger speed state.

[0046] 4) The fourth test method is used to obtain the theoretical service life (time) n1 of the supercharger rotating parts at low supercharger oil inlet pressure: Specific implementation process: select multiple models of supercharger samples for testing. The supercharger oil inlet pressure P is within the range of P1 to P2. Every 10 minutes of operation, the supercharger oil inlet pressure P decreases by 10 kPa. After P gradually decreases from P1 to P2, the next identical cycle begins. During the test, the supercharger turbine inlet temperature T is strictly controlled to be lower than T1 and the supercharger speed N is lower than N1 until the supercharger rotating parts fail. The test time of multiple superchargers is counted and the average value is taken as the theoretical service life (time) n3 of the supercharger rotating parts under the low supercharger oil inlet pressure state.

[0047] 5) Method for determining weighted coefficients w1, w2, w3 of the service life of supercharger rotating parts: w1=n1 / (n1+n2+n3); w2=n2 / (n1+n2+n3); w3=n3 / (n1+n2+n3).

[0048] The system device integrates a data storage unit to store the processing data of the data analysis and processing unit, which generally uses an ordinary mobile hard disk. The recorded data includes the time t1, t2, t3 of the normal working state of the supercharger, the time m1, m2, m3 of the high-load working state, and the remaining service life ty of the supercharger.

[0049] The system device has an internal integrated debugging interface module, which generally uses a USB interface module. It is used for system device software filling, monitoring and debugging, and can also download recorded data.

[0050] The system device integrates a data transmission unit to realize external communication of processed data. An integrated Ethernet gateway can be used for data communication. The data of the data analysis and processing unit is sent to the data display unit. The display unit is integrated on the housing of the system device, and the data can be viewed at any time. The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. If the present invention is modified or replaced by equivalents without departing from the spirit and scope of the present invention, it should be included in the protection scope of the claims of the present invention.

Claims

1. A method for predicting the life of a diesel engine supercharger rotating part, characterized in that: include: A first remaining service life of a supercharger rotating part calculated according to a supercharger turbine inlet temperature is obtained according to a first formula, wherein the first formula includes: ty1=t-t1-tx1 and tx1=(t / n1)m1; The second remaining service life of the supercharger rotating part calculated according to the supercharger speed is obtained according to the second formula, wherein the second formula includes: ty2=t-t2-tx2 and tx2=(t / n2)m2; The third remaining service life of the supercharger rotating part calculated according to the supercharger oil inlet pressure is obtained according to the third formula, wherein the third formula includes: ty3=t-t3-tx3 and tx3=(t / n3)m3; Based on the first remaining service life, the second remaining service life and the third remaining service life, the remaining service life of the supercharger rotating part is obtained according to a fourth formula, wherein the fourth formula includes: in: ty1 is the first remaining service life, t is the theoretical service life of the supercharger rotating parts under normal conditions, t1 is the service time of the supercharger rotating parts under normal supercharger turbine inlet temperature conditions, tx1 is the equivalent service time of the supercharger rotating parts under high supercharger turbine inlet temperature conditions, n1 is the theoretical service life of the supercharger rotating parts under high supercharger turbine inlet temperature conditions, and m1 is the service time of the supercharger rotating parts under high supercharger turbine inlet temperature conditions; ty2 is the second remaining service life, t2 is the use time of the supercharger rotating parts under the normal supercharger speed state, tx2 is the equivalent use time of the supercharger rotating parts under the high supercharger speed state, n2 is the theoretical service life of the supercharger rotating parts under the high supercharger speed state, and m2 is the use time of the supercharger rotating parts under the high supercharger speed state; ty3 is the third remaining service life, t3 is the service time of the supercharger rotating parts under the normal supercharger oil inlet pressure state, tx3 is the equivalent service time of the supercharger rotating parts under the low supercharger oil inlet pressure state, n3 is the theoretical service life of the supercharger rotating parts under the low supercharger oil inlet pressure state, and m3 is the service time of the supercharger rotating parts under the low supercharger oil inlet pressure state; ty is the remaining service life of the supercharger rotating parts, w1 is the weighted coefficient of the influence of the supercharger turbine inlet temperature on the service life, w2 is the weighted coefficient of the influence of the supercharger speed on the service life, and w3 is the weighted coefficient of the influence of the supercharger oil inlet pressure on the service life.

2. The method for predicting the life of a diesel engine supercharger rotating part according to claim 1, characterized in that: The normal state determination conditions include: the supercharger turbine inlet temperature T is less than T1, the supercharger speed N is less than N1, and the supercharger oil inlet pressure P is greater than P1; The normal supercharger turbine inlet temperature state determination condition includes: the supercharger turbine inlet temperature T is less than T1; The high supercharger turbine inlet temperature state determination condition includes: the supercharger turbine inlet temperature T is greater than T1 and less than T2; The normal supercharger speed state determination condition includes: the supercharger speed N is less than N1; The high supercharger speed state determination condition includes: the supercharger speed N is greater than N1 and less than N2; The normal supercharger oil inlet pressure state determination condition includes: the supercharger oil inlet pressure P is greater than P1; The low supercharger oil inlet pressure state determination condition includes: the supercharger oil inlet pressure P is less than P1 and greater than P2; Among them, T1 is the normal threshold of supercharger turbine inlet temperature, N1 is the normal threshold of supercharger speed, P1 is the normal threshold of supercharger oil inlet pressure, T2 is the high threshold of supercharger turbine inlet temperature, N2 is the high threshold of supercharger speed, P2 is the low threshold of supercharger oil inlet pressure, and T1<T2, N1<N2, P1>P2.

3. The method for predicting the life of a diesel engine supercharger rotating part according to claim 2, characterized in that: The theoretical service life t of the supercharger rotating parts in a normal state is obtained by a first test method, wherein the first test method comprises: When the supercharger turbine inlet temperature T is lower than T1 and the supercharger oil inlet pressure P is higher than P1, the supercharger speed N is cyclically changed in the range of 0 to N1, and the time from the start of the first test to the failure of the supercharger rotating parts is obtained as the theoretical service life t of the supercharger rotating parts in normal state.

4. The method for predicting the life of a diesel engine supercharger rotating part according to claim 2, characterized in that: The theoretical service life n1 of the supercharger rotating parts under the condition of high supercharger turbine inlet temperature is obtained by the second test method, wherein the second test method comprises: When the supercharger speed N is lower than N1 and the supercharger oil inlet pressure P is higher than P1, the supercharger turbine inlet temperature T changes cyclically within the range of T1 to T2, and the time from the start of the second test to the failure of the supercharger rotating parts is obtained as the theoretical service life n1 of the supercharger rotating parts under the high turbine inlet temperature state.

5. The method for predicting the life of a diesel engine supercharger rotating part according to claim 2, characterized in that: The theoretical service life n2 of the supercharger rotating part under the high supercharger speed state is obtained by the third test method, and the third test method includes: When the supercharger turbine inlet temperature T is lower than T1 and the supercharger oil inlet pressure P is higher than P1, the supercharger speed N is cyclically changed in the range of N1 to N2, and the time from the start of the third test to the failure of the supercharger rotating parts is obtained as the theoretical service life n2 of the supercharger rotating parts under high supercharger speed state.

6. The method for predicting the life of a diesel engine supercharger rotating part according to claim 2, characterized in that: The theoretical service life of the supercharger rotating parts under the low supercharger oil inlet pressure state is obtained by the fourth test method, and the fourth test method includes: When the supercharger turbine inlet temperature T is lower than T1 and the supercharger speed is lower than N1, the supercharger oil inlet pressure is cyclically changed in the range of P1 to P2, and the time from the start of the fourth test to the failure of the supercharger rotating parts is obtained, which is the theoretical service life n3 of the supercharger rotating parts under the low supercharger oil inlet pressure state.

7. The method for predicting the life of a diesel engine supercharger rotating part according to claim 1, characterized in that: The weighted coefficient of the turbocharger turbine inlet temperature on the service life is: w1=n1 / (n1+n2+n3), The weighted coefficient of the supercharger speed on the service life is: w2=n2 / (n1+n2+n3), Weighted coefficient of the influence of supercharger oil inlet pressure on service life: w3=n3 / (n1+n2+n3).

8. A device for predicting the life of a diesel engine supercharger rotating part, characterized in that: include: A data acquisition unit and a data analysis and processing unit, wherein the data acquisition unit is used to collect operating data of the supercharger and transmit the collected operating data to the data analysis and processing unit, wherein the data analysis and processing unit adopts the method according to any one of claims 1 to 7 according to the operating data to obtain the remaining service life of the rotating parts of the supercharger through calculation, wherein the operating data includes: a supercharger turbine inlet temperature T, a supercharger speed N and a supercharger oil inlet pressure P.

9. The device for predicting the life of a diesel engine supercharger rotating part according to claim 8, characterized in that: The data acquisition unit includes a turbine inlet temperature sensor, a supercharger speed sensor and a supercharger oil inlet pressure sensor, which are used to respectively collect the supercharger turbine inlet temperature T, the supercharger speed T and the supercharger oil inlet pressure P.

10. The device for predicting the life of a diesel engine supercharger rotating part according to claim 8, characterized in that: The device further comprises a display unit, which is connected to the data analysis and processing unit and is used to display the remaining service life of the supercharger rotating part calculated by the data analysis and processing unit.

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