A method for evaluating the running state of a marine lubricating oil daily system

Abstract

The present application relates to a kind of overall monitoring of lubricating oil daily system, more specifically, it is related to a kind of ship lubricating oil daily system operating state evaluation method, the lubricating oil daily system mainly includes following part: cylinder oil daily cabin, main engine lubricating oil circulating cabin, main engine lubricating oil pump, main engine lubricating oil cooler, main engine lubricating oil self-cleaning filter, main engine crosshead lubricating oil pump.The present application is processed by the data signal collected in system, is combined with the operating characteristics of system and equipment, utilizes logic judgment and hierarchical analysis method data processing, realizes the health state evaluation of lubricating oil daily system, according to real ship data test verification, system operating state judgment accuracy can reach 96% or more.The present application further realizes the relevant requirements of specification in intelligent engine room part, also provides certain reference and auxiliary decision for the real-time monitoring of ship operation and the operation management of crew.

Description

Technical Field

[0001] This invention relates to a method for overall monitoring of a lubricating oil daily service system, and more specifically, to a method for assessing the operational status of a ship's lubricating oil daily service system. Background Technology

[0002] Compared to the 2015 version, the 2020 edition of the China Classification Society's "Intelligent Ship Specification" has changed the object of health status assessment from "equipment" to "equipment or system" in Chapter 4, the section on intelligent engine rooms. This reflects that the specification now focuses not only on the operational status of individual devices but also elevates the level of monitoring objects, setting corresponding requirements for the health monitoring of operating systems. Furthermore, compared to equipment, the health status of a system more directly reflects the overall operational status of the ship.

[0003] Currently, most requirements for intelligent ship specifications rely on shipyards collecting and summarizing equipment operation data provided by equipment manufacturers or directly accessing the intelligent data results integrated by the equipment manufacturers themselves to assess the health status of engine room equipment. However, due to the highly customized nature of ship system design, it is difficult to complete the overall health status assessment of the system using a single fixed monitoring value. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a method for assessing the health status of a marine lubricating oil daily use system. By processing data signals collected from the system and combining the operating characteristics of the system and equipment, the method utilizes logical judgment and hierarchical analysis for data processing to achieve an assessment of the health status of the lubricating oil daily use system.

[0005] This invention provides a method for assessing the operating status of a ship's main engine fuel system, comprising the following steps:

[0006] S1. Collect status data, including the following:

[0007] #1 cylinder oil daily use tank level H1, #2 cylinder oil daily use tank level H2, main engine lubricating oil circulation tank level H3, main engine cylinder oil inlet temperature T1, main engine lubricating oil inlet temperature T2, main engine crosshead lubricating oil inlet temperature T3, main engine lubricating oil pump outlet pressure P1, main engine lubricating oil inlet pressure P2, main engine crosshead lubricating oil pump outlet pressure P3, main engine crosshead lubricating oil inlet pressure P4;

[0008] Based on the signal attributes of the collected data, it is divided into three types: liquid level, temperature, and pressure. These serve as the intermediate layer of the hierarchical analysis to determine the standard values ​​and corresponding normal fluctuation ranges of each parameter.

[0009] Liquid level data:

[0010] Standard values ​​of H1 and H2 for the daily oil tank levels of cylinders #1 and #2 n1 Hn2 Minimum value H l1 H l2 Maximum value H h1 H h2 ;

[0011] Standard value of H3 level in the main engine lubricating oil circulation tank n3 Minimum value H l3 Maximum value H h3 ;

[0012] Temperature data:

[0013] Standard value of main engine cylinder oil inlet temperature T1 T n1 Minimum value T l1 Maximum value T h1 ;

[0014] Standard value of main engine lubricating oil inlet temperature T2 T n2 Minimum value T l2 Maximum value T h2 ;

[0015] Standard value of crosshead lubricating oil inlet temperature T3 for main engine n3 Minimum value T l3 Maximum value T h3 ;

[0016] Stress data:

[0017] Standard value of main engine lubricating pump outlet pressure P1 P n1 Minimum value P l1 Maximum value P h1 ;

[0018] Standard value of main engine lubricating oil inlet pressure P2 P n2 Minimum value P l2 Maximum value P h2 ;

[0019] Standard value of the outlet pressure P3 of the main engine crosshead lubricating oil pump P3 n3 Minimum value P l3 Maximum value P h3 ;

[0020] Standard value of P4 for lubricating oil inlet pressure of main engine crosshead n4 Minimum value P l4 Maximum value P h4 ;

[0021] S2. Set the weighting coefficients, including the following:

[0022] Data types Weighting coefficient <![CDATA[Liquid level data ω1]]> 0.05 <![CDATA[Temperature data ω2]]> 0.45 <![CDATA[Pressure data ω3]]> 0.5 <![CDATA[Level ω of the daily service tank for cylinder oil 11 > 0.3 <![CDATA[Daily use tank level of cylinder oil No.2 ω 12 > 0.3 <![CDATA[Main engine lubricating oil sump level ω 13 > 0.4 <![CDATA[Main engine cylinder oil inlet temperature ω 21 > 0.2 <![CDATA[Main engine lubricating oil inlet temperature ω 22 > 0.4 <![CDATA[Main engine crosshead lubricating oil inlet temperature ω 23 > 0.4 <![CDATA[Outlet pressure ω of the main engine lubricating oil pump 31 > 0.2 <![CDATA[Main engine lubricating oil inlet pressure ω 32 > 0.3 <![CDATA[Outlet pressure ω of the main engine crosshead lubricating oil pump 33 > 0.2 <![CDATA[Main engine crosshead lubricating oil inlet pressure ω 34 > 0.3

[0023] S3, a) Determine whether each collected data is between the corresponding minimum and maximum values. If the collected data value is higher than the maximum value or lower than the minimum value, the operating status judgment result is fed back as a system fault, reminding the crew to perform maintenance as soon as possible. Otherwise, perform the following calculation.

[0024] b) Calculate the health status of the basic data layer's liquid level, temperature, and pressure based on the collected data results:

[0025] Basic layer liquid level data health status S 11 S 12 S 13 :

[0026]

[0027] Basic layer temperature data health status S 21 S 22 S 23 :

[0028]

[0029] Basic layer pressure data health status S 31 S 32 S 33 S 34 :

[0030]

[0031] c) Calculate the health status of the intermediate layer based on the health status and weighting coefficients of the basic layer data:

[0032] The health status S1 of the intermediate layer liquid level data is:

[0033]

[0034] The health status S2 of the intermediate layer temperature data is:

[0035]

[0036] The intermediate layer pressure data health status S3 is:

[0037]

[0038] d) Calculate the health status S of the lubricating oil daily use system by combining the health status of the intermediate layer and the weighting coefficients:

[0039] .

[0040] In the preferred embodiment, the liquid level data in step S1 includes the standard values ​​H1 and H2 of the cylinder oil daily use tank liquid levels. n1 H n2Take the 70% liquid level value of the tank, minimum value H l1 H l2 Take the corresponding start-up liquid level of the transfer pump, which is usually 30% of the container's liquid level, with a maximum value of H. h1 H h2 Take the corresponding overflow pipe level, which is usually 95% of the tank level;

[0041] Standard value of H3 level in the main engine lubricating oil circulation tank n3 Take the 70% liquid level value of the tank, minimum value H l3 Take the corresponding start-up liquid level of the transfer pump, which is usually 30% of the container's liquid level, with a maximum value of H. h3 Take the corresponding high alarm liquid level, which is usually 90% of the liquid level in the tank.

[0042] In the preferred embodiment, the temperature data in step S1 is: the standard value T of the main engine cylinder oil inlet temperature T1. n1 The oil inlet temperature for the main engine cylinder is typically set at 40℃, but the exact temperature depends on the manufacturer's specifications for the specific model. The minimum value is T. l1 Set to the lowest permissible cylinder oil temperature by the main unit, with a maximum value of T. h1 The maximum allowable cylinder oil temperature is set to 35~50℃, but the specific temperature range depends on the manufacturer's requirements for the model.

[0043] In the preferred embodiment, the temperature data in step S1 is: the standard value T of the main engine lubricating oil inlet temperature T2. n2 The design inlet temperature for the main unit's lubricating oil is typically 45℃, but the specific temperature will vary depending on the manufacturer's requirements for the model. The minimum value is T. l2 Set to the minimum allowable lubricating oil temperature of the host, with a maximum value of T. h2 Set the maximum allowable lubricating oil temperature of the main unit. The typical temperature range is 45±2℃, but the specific temperature range depends on the manufacturer's requirements for the model.

[0044] In the preferred embodiment, the temperature data in step S1 is: the standard value T of the main engine crosshead lubricating oil inlet temperature T3. n3 The design inlet temperature for the crosshead lubricating oil is typically 45℃, but the exact temperature depends on the manufacturer's specifications for the specific model. The minimum value is T. l3 Set to the minimum allowable crosshead lubricating oil temperature of the main unit, and the maximum temperature T. h3 Set the maximum allowable temperature of the crosshead lubricating oil in the main unit. The typical temperature range is 45±2℃, but the specific temperature range depends on the manufacturer's requirements for the model.

[0045] In the preferred embodiment, the pressure data in step S1 is: the standard value P of the main engine lubricating pump outlet pressure P1. n1 The minimum discharge pressure P is set as the design operating pressure of the main engine lubricating pump. l1 The minimum value P is set as the setpoint for the main engine lubricating pump outlet pressure switch.l1 Simultaneously, the setpoint for starting the standby pump, the maximum value P h1 Set the head to the shut-off point of the main engine oil pump (centrifugal pump);

[0046] In the preferred embodiment, the pressure data in step S1 is: the standard value P of the main engine lubricating oil inlet pressure P2. n2 The minimum inlet pressure of the main unit's lubricating oil is set to P. l2 Set as the minimum allowable inlet pressure value for the main engine lubricating oil, with a maximum value of P. h2 The maximum allowable inlet pressure of the main engine lubricating oil and the setting value of the pressure regulating valve on the bypass line at the inlet need to be compared, and the smaller of the two is taken as the maximum value P. h2 The inlet pressure range is typically required to be 0.4~0.5MPa, depending on the manufacturer's requirements for the specific model.

[0047] In the preferred embodiment, the pressure data in step S1 is: the standard value P3 of the outlet pressure P3 of the main engine crosshead lubricating pump. n3 The minimum discharge pressure P is set as the design operating condition for the main unit's crosshead lubricating pump. l3 The minimum value P is set as the setpoint for the outlet pressure switch of the main unit's crosshead lubricating pump. l3 Simultaneously, the setpoint for starting the standby pump, the maximum value P h3 Set the pressure to the outlet safety valve of the main unit's crosshead lubricating pump;

[0048] In the preferred configuration, the standard value P4 of the lubricating oil inlet pressure of the main engine crosshead is... n4 The minimum inlet pressure of the lubricating oil for the main unit's crosshead is set to P. l4 Set as the minimum allowable inlet pressure value for the crosshead lubricating oil of the main unit, with a maximum value of P. h4 The maximum allowable inlet pressure value for the crosshead lubricating oil of the main unit is set. The inlet pressure range is usually required to be 1.0~1.3MPa, depending on the manufacturer's requirements for the specific model.

[0049] In the preferred embodiment, step S3 calculates the health status S of the lubricating oil daily use system by combining the intermediate layer health status and weighting coefficients: the value of the calculated result S reflects the operational health status of the entire lubricating oil daily use system, and its value ranges from 0 to 1. The larger the value, the higher the health of the system. Generally, when the S value is greater than 0.8, the system can be considered to be operating well; when the value is between 0.6 and 0.8, it is necessary to continuously monitor the overall trend of the system health status and subsequent operation; when it is less than 0.6, it reflects that there may be potential faults in the system, and it is necessary to promptly check the operating status of the equipment and system pipelines.

[0050] This invention enables comprehensive monitoring of the lubricating oil daily operating system and completes the overall health status assessment of the system through a comprehensive evaluation and analysis method. Based on actual ship data testing and verification, the accuracy rate of system operation status judgment can reach over 96%. This invention further fulfills the relevant requirements of the intelligent engine room component in the specifications, and also provides certain references and auxiliary decision-making for real-time monitoring of ship operations and crew operation management. Attached Figure Description

[0051] Figure 1 This is a logic diagram for judging the operating status of a daily lubricating oil system. Detailed Implementation

[0052] like Figure 1 As shown, this invention is a method for evaluating the operational status of a ship's daily lubricating oil system, comprising the following steps:

[0053] 1. Collect status data, including the following:

[0054] #1 cylinder oil daily use tank level H1, #2 cylinder oil daily use tank level H2, main engine lubricating oil circulation tank level H3, main engine cylinder oil inlet temperature T1, main engine lubricating oil inlet temperature T2, main engine crosshead lubricating oil inlet temperature T3, main engine lubricating oil pump outlet pressure P1, main engine lubricating oil inlet pressure P2, main engine crosshead lubricating oil pump outlet pressure P3, main engine crosshead lubricating oil inlet pressure P4;

[0055] Based on the signal attributes of the collected data, it is divided into three types: liquid level, temperature and pressure, which serve as the middle layer of the hierarchical analysis. According to the design characteristics of the system and equipment, the standard values ​​and corresponding normal fluctuation ranges of each parameter data are determined.

[0056] Liquid level data:

[0057] Standard values ​​of H1 and H2 for the daily oil tank levels of cylinders #1 and #2 n1 H n2 Take the 70% liquid level value of the tank, minimum value H l1 H l2 Take the corresponding start-up liquid level of the transport pump (usually 30% of the tank level), with the maximum value H. h1 H h2 Take the corresponding overflow pipe level (usually 95% of the tank level).

[0058] Standard value of H3 level in the main engine lubricating oil circulation tank n3 Take the 70% liquid level value of the tank, minimum value H l3 Take the corresponding start-up liquid level of the transport pump (usually 30% of the tank level), with the maximum value H. h3 Take the corresponding high alarm liquid level (usually 90% of the liquid level in the tank).

[0059] The numbers 1# and 2# are the tank numbers, which only represent the relative positions of the tanks.

[0060] Temperature data:

[0061] Standard value of main engine cylinder oil inlet temperature T1 T n1 The oil inlet for the main engine cylinder is set to a design temperature of 40℃ (the specific temperature depends on the manufacturer's requirements for the specific model), with a minimum value of T. l1 Set to the lowest permissible cylinder oil temperature by the main unit, with a maximum value of T. h1 Set to the maximum allowable cylinder oil temperature of the main unit (usually the temperature range is 35~50℃, but the specific temperature depends on the manufacturer's requirements for the model).

[0062] Standard value of main engine lubricating oil inlet temperature T2 T n2 The minimum value T is set to the main unit's lubricating oil design inlet temperature (usually 45℃, but the specific value depends on the manufacturer's model requirements). l2 Set to the minimum allowable lubricating oil temperature of the host, with a maximum value of T. h2 Set the maximum allowable lubricating oil temperature for the main unit (the temperature range is usually required to be 45±2℃, but the specific temperature range depends on the manufacturer's requirements for the model).

[0063] Standard value of crosshead lubricating oil inlet temperature T3 for main engine n3 The minimum value T is set to the design inlet temperature of the crosshead lubricating oil in the main unit (usually 45℃, but the specific temperature depends on the manufacturer's requirements for the model). l3 Set to the minimum allowable crosshead lubricating oil temperature of the main unit, and the maximum temperature T. h3 Set the maximum allowable temperature of the crosshead lubricating oil on the main unit (the temperature range is usually required to be 45±2℃, but the specific temperature range depends on the manufacturer's requirements for the model).

[0064] Stress data:

[0065] Standard value of main engine lubricating pump outlet pressure P1 P n1 The minimum discharge pressure P is set as the design operating pressure of the main engine lubricating pump. l1 Set to the set value of the main engine lubricating pump outlet pressure switch (start standby pump), maximum value P h1 Set the head to the shut-off point of the main engine oil pump (centrifugal pump);

[0066] Standard value of main engine lubricating oil inlet pressure P2 P n2 The minimum inlet pressure of the main unit's lubricating oil is set to P. l2 Set as the minimum allowable inlet pressure value for the main engine lubricating oil, with a maximum value of P. h2 The maximum allowable inlet pressure of the main engine lubricating oil and the setting value of the pressure regulating valve on the bypass line at the inlet need to be compared, and the smaller of the two is taken as the maximum value P. h2(The inlet pressure is usually 0.4~0.5MPa, but the specific pressure depends on the manufacturer's requirements for the model.)

[0067] Standard value of the outlet pressure P3 of the main engine crosshead lubricating oil pump P3 n3 The minimum discharge pressure P is set as the design operating condition for the main unit's crosshead lubricating pump. l3 Set to the set value of the main unit crosshead lubricating pump outlet pressure switch (start standby pump), maximum value P h3 Set the pressure to the bypass safety valve at the outlet of the main unit's crosshead lubricating pump.

[0068] Standard value of P4 for lubricating oil inlet pressure of main engine crosshead n4 The minimum inlet pressure of the lubricating oil for the main unit's crosshead is set to P. l4 Set as the minimum allowable inlet pressure value for the crosshead lubricating oil of the main unit, with a maximum value of P. h4 Set to the maximum allowable inlet pressure value for the crosshead lubricating oil of the main unit (usually 1.0~1.3MPa, the specific value is determined according to the manufacturer's requirements for the model).

[0069] 2. Set weighting coefficients, including the following:

[0070] Table 1. Weight coefficients of each layer in the hierarchical analysis.

[0071] Data types Weighting coefficient <![CDATA[Liquid level data ω1]]> 0.05 <![CDATA[Temperature data ω2]]> 0.45 <![CDATA[Pressure data ω3]]> 0.5 <![CDATA[Level ω of the daily service tank for cylinder oil 11 > 0.3 <![CDATA[Level ω of the daily service tank for cylinder oil No. 2 12 > 0.3 <![CDATA[Main engine lubricating oil sump tank level ω 13 > 0.4 <![CDATA[Inlet temperature ω of main engine cylinder oil 21 > 0.2 <![CDATA[Main engine lubricating oil inlet temperature ω 22 > 0.4 <![CDATA[Main engine crosshead lubricating oil inlet temperature ω 23 > 0.4 <![CDATA[The outlet pressure ω of the main engine lubricating oil pump 31 > 0.2 <![CDATA[Main engine lubricating oil inlet pressure ω 32 > 0.3 <![CDATA[Outlet pressure ω of the main engine crosshead lubricating oil pump 33 > 0.2 <![CDATA[Main engine crosshead lubricating oil inlet pressure ω 34 > 0.3

[0072] 3. a) Determine whether each collected data is between its corresponding minimum and maximum value. If the collected data value is higher than the maximum value or lower than the minimum value, the operating status judgment result is fed back as a system fault, and the crew is reminded to perform maintenance as soon as possible; if all parameters are within the normal range, then proceed with the subsequent calculations.

[0073] b) Calculate the health status of the basic data layer's liquid level, temperature, and pressure based on the collected data results:

[0074] Basic layer liquid level data health status S 11 S 12 S 13 :

[0075]

[0076] Basic layer temperature data health status S 21 S 22 S 23 :

[0077]

[0078] Basic layer pressure data health status S 31 S 32 S 33 S34 :

[0079]

[0080] c) Calculate the health status of the intermediate layer based on the health status and weighting coefficients of the basic layer data:

[0081] The health status S1 of the intermediate layer liquid level data is:

[0082]

[0083] The health status S2 of the intermediate layer temperature data is:

[0084]

[0085] The intermediate layer pressure data health status S3 is:

[0086]

[0087] d) Calculate the health status S of the lubricating oil daily use system by combining the health status of the intermediate layer and the weighting coefficients:

[0088]

[0089] The calculated value of S reflects the operational health status of the entire lubricating oil daily use system. Its value ranges from 0 to 1. The larger the value, the higher the health of the system. Generally, when the S value is greater than 0.8, the system can be considered to be operating well. When the value is between 0.6 and 0.8, it is necessary to continuously monitor the overall trend of the system's health status and subsequent operation. When it is less than 0.6, it reflects that there may be potential faults in the system, and the operating status of the equipment and system pipelines needs to be checked in time.

[0090] This invention can monitor the overall operating status of a ship's lubricating oil daily service system. Based on the overall analysis of the collected data, it comprehensively processes the characteristic data in the equipment and pipelines to calculate and evaluate the current health status of the lubricating oil daily service system. According to actual ship data testing and verification, the accuracy rate of system operating status judgment can reach more than 96%, which further realizes the relevant requirements of the intelligent engine room in the standard. At the same time, it also provides a certain reference and auxiliary decision-making for real-time monitoring of ship operation and crew operation management.

[0091] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for evaluating the operational status of a ship's daily lubricating oil system, characterized in that, Includes the following steps: S1. Collect status data, including the following: #1 cylinder oil daily use tank level H1, #2 cylinder oil daily use tank level H2, main engine lubricating oil circulation tank level H3, main engine cylinder oil inlet temperature T1, main engine lubricating oil inlet temperature T2, main engine crosshead lubricating oil inlet temperature T3, main engine lubricating oil pump outlet pressure P1, main engine lubricating oil inlet pressure P2, main engine crosshead lubricating oil pump outlet pressure P3, main engine crosshead lubricating oil inlet pressure P4; Based on the signal attributes of the collected data, it is divided into three types: liquid level, temperature and pressure, which serve as the middle layer of the hierarchical analysis to determine the standard values ​​and corresponding normal fluctuation ranges of each parameter data. Liquid level data: Standard values ​​of H1 and H2 for the daily oil tank levels of cylinders #1 and #2 n1 H n2 Minimum value H l1 H l2 Maximum value H h1 H h2 ; Standard value of H3 level in the main engine lubricating oil circulation tank n3 Minimum value H l3 Maximum value H h3 ; Temperature data: Standard value of main engine cylinder oil inlet temperature T1 T n1 Minimum value T l1 Maximum value T h1 ; Standard value of main engine lubricating oil inlet temperature T2 T n2 Minimum value T l2 Maximum value T h2 ; Standard value of crosshead lubricating oil inlet temperature T3 for main engine n3 Minimum value T l3 Maximum value T h3 ; Stress data: Standard value of main engine lubricating pump outlet pressure P1 P n1 Minimum value P l1 Maximum value P h1 ; Standard value of main engine lubricating oil inlet pressure P2 P n2 Minimum value P l2 Maximum value P h2 ; Standard value of the outlet pressure P3 of the main engine crosshead lubricating pump P3 n3 Minimum value P l3 Maximum value P h3 ; Standard value of P4 for lubricating oil inlet pressure of main engine crosshead n4 Minimum value P l4 Maximum value P h4 ; S2. Set the weighting coefficients, including the following: S3, a) Determine whether each collected data is between the corresponding minimum and maximum values. If the collected data value is higher than the maximum value or lower than the minimum value, the operating status judgment result is fed back as a system fault, reminding the crew to perform maintenance as soon as possible. Otherwise, perform the following calculation. b) Calculate the health status of the basic data layer's liquid level, temperature, and pressure based on the collected data results: Basic layer liquid level data health status S 11 S 12 S 13 : Basic layer temperature data health status S 21 S 22 S 23 : Basic layer pressure data health status S 31 S 32 S 33 S 34 : c) Calculate the health status of the intermediate layer based on the health status and weighting coefficients of the basic layer data: The health status S1 of the intermediate layer liquid level data is: The health status S2 of the intermediate layer temperature data is: The intermediate layer pressure data health status S3 is: d) Calculate the health status S of the lubricating oil daily use system by combining the health status of the intermediate layer and the weighting coefficients: 。 2. The method for evaluating the operating status of a ship's daily lubricating oil system according to claim 1, characterized in that, The liquid level data in step S1 includes the standard values ​​of H1 and H2 of the daily oil tank levels for cylinders #1 and #2. n1 H n2 Take the 70% liquid level value of the tank, minimum value H l1 H l2 Take the corresponding start-up liquid level of the transfer pump, which is usually 30% of the container's liquid level, with a maximum value of H. h1 H h2 Take the corresponding overflow pipe level, which is usually 95% of the tank level; Standard value of H3 level in the main engine lubricating oil circulation tank n3 Take the 70% liquid level value of the tank, minimum value H l3 Take the corresponding start-up liquid level of the transfer pump, which is usually 30% of the container's liquid level, with a maximum value of H. h3 Take the corresponding high alarm liquid level, which is usually 90% of the liquid level value of the tank.

3. The method for evaluating the operating status of a ship's daily lubricating oil system according to claim 1, characterized in that, The temperature data in step S1: the standard value of the main engine cylinder oil inlet temperature T1. n1 The oil inlet temperature for the main engine cylinder is typically set at 40℃, but the exact temperature depends on the manufacturer's specifications for the specific model. The minimum value is T. l1 Set to the lowest permissible cylinder oil temperature by the main unit, with a maximum value of T. h1 The maximum allowable cylinder oil temperature is set to 35~50℃, which is usually required to be determined according to the manufacturer's requirements for the specific model.

4. The method for evaluating the operating status of a ship's daily lubricating oil system according to claim 1, characterized in that, The temperature data in step S1: the standard value T of the main engine lubricating oil inlet temperature T2. n2 The design inlet temperature for the main unit's lubricating oil is typically 45℃, but the specific temperature will vary depending on the manufacturer's requirements for the model. The minimum value is T. l2 Set to the minimum allowable lubricating oil temperature of the host, with a maximum value of T. h2 Set the maximum allowable lubricating oil temperature of the main unit. The typical temperature range is 45±2℃, but the specific temperature range depends on the manufacturer's requirements for the model.

5. The method for evaluating the operating status of a ship's daily lubricating oil system according to claim 1, characterized in that, The temperature data in step S1: the standard value of the main unit crosshead lubricating oil inlet temperature T3. n3 The design inlet temperature for the crosshead lubricating oil is typically 45℃, but the exact temperature depends on the manufacturer's specifications for the specific model. The minimum value is T. l3 Set to the minimum allowable crosshead lubricating oil temperature for the main unit, with a maximum value of T. h3 Set the maximum allowable temperature of the crosshead lubricating oil on the main unit. The typical temperature range is 45±2℃, but the specific temperature range depends on the manufacturer's requirements for the model.

6. The method for evaluating the operating status of a ship's daily lubricating oil system according to claim 1, characterized in that, The pressure data in step S1: the standard value of the main engine lubricating pump outlet pressure P1. n1 The minimum discharge pressure P is set as the design operating pressure of the main engine lubricating pump. l1 The minimum value P is set as the setpoint for the main engine lubricating pump outlet pressure switch. l1 Simultaneously, the setpoint for starting the standby pump, the maximum value P h1 Set to the head at the shut-off point of the main engine lubricating pump.

7. The method for evaluating the operating status of a ship's daily lubricating oil system according to claim 1, characterized in that, The pressure data in step S1: Standard value of main engine lubricating oil inlet pressure P2 P n2 The minimum inlet pressure of the main unit's lubricating oil is set to P. l2 Set as the minimum allowable inlet pressure value for the main engine lubricating oil, with a maximum value of P. h2 The maximum allowable inlet pressure of the main engine lubricating oil and the setting value of the pressure regulating valve on the bypass line at the inlet need to be compared, and the smaller of the two is taken as the maximum value P. h2 The inlet pressure is usually required to be within the range of 0.4~0.5MPa, depending on the manufacturer's requirements for the specific model.

8. The method for evaluating the operating status of a ship's daily lubricating oil system according to claim 1, characterized in that, The pressure data in step S1: Standard value of the main engine crosshead lubricating pump outlet pressure P3 P n3 The minimum discharge pressure P is set as the design operating condition for the main unit's crosshead lubricating pump. l3 The minimum value P is set as the setpoint for the outlet pressure switch of the main unit's crosshead lubricating pump. l3 Simultaneously, the setpoint for starting the standby pump, the maximum value P h3 Set the pressure to the outlet safety valve of the main unit's crosshead lubricating pump.

9. The method for evaluating the operational status of a ship's daily lubricating oil system according to claim 1, characterized in that, The pressure data in step S1: Standard value of P4 for the lubricating oil inlet pressure of the main unit crosshead. n4 The minimum inlet pressure of the lubricating oil for the main unit's crosshead is set to P. l4 Set as the minimum allowable inlet pressure value for the crosshead lubricating oil of the main unit, with a maximum value of P. h4 The maximum allowable inlet pressure value for the crosshead lubricating oil of the main unit is set. The inlet pressure range is usually required to be 1.0~1.3MPa, depending on the manufacturer's requirements for the specific model.

10. The method for evaluating the operating status of a ship's daily lubricating oil system according to claim 1, characterized in that, Step S3 calculates the health status S of the lubricating oil daily use system by combining the intermediate layer health status and weighting coefficients. The value of the calculated result S reflects the operational health status of the entire lubricating oil daily use system. Its value ranges from 0 to 1. The larger the value, the higher the health of the system. Generally, when the S value is greater than 0.8, the system can be considered to be operating well. When the value is between 0.6 and 0.8, it is necessary to continuously monitor the overall trend of the system health status and subsequent operation. When it is less than 0.6, it reflects that there may be potential faults in the system, and it is necessary to check the operating status of equipment and system pipelines in a timely manner.

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