An engine health management method and system

Abstract

This invention discloses an engine health management method and system. First, the exhaust temperature Ti of each cylinder is obtained. Then, based on the exhaust temperatures of all cylinders, the average exhaust temperature, maximum exhaust temperature, and minimum exhaust temperature are obtained. Next, |Ti-Tave| and Tmax-Tmin are set as correction boundary conditions. When the correction boundary conditions are met, correction begins by adjusting the fuel quantity of each cylinder, with the adjustment amount for the i-th cylinder being M. Correction is completed when the cumulative fuel quantity M is greater than the maximum corrected fuel quantity Mmax, or |Ti-Tave| is not greater than or equal to a preset first temperature threshold T. If M is greater than the maximum corrected fuel quantity Mmax, and |Ti-Tave| is still greater than or equal to the preset first temperature threshold T, a combustion abnormality signal for the i-th cylinder is sent to the engine monitoring system, prompting a shutdown for inspection. Therefore, this invention determines whether the engine is operating abnormally based on the exhaust temperature of a single cylinder, and achieves healthy engine operation and safe marine operation by determining correction boundary conditions and controlling the engine's operating boundaries.

Description

Technical Field

[0001] This invention relates to the field of engine technology, and in particular to an engine health management method and system. Background Technology

[0002] Improper maintenance or prolonged use during marine engine operation can lead to wear on components of the electronically controlled unit fuel injection pump and injector assembly in the fuel system. This can cause abnormal fuel injection in one or more cylinders, resulting in abnormal combustion within the cylinder. If this abnormality is not identified in time, it can lead to excessively high exhaust temperatures, abnormal vibrations, and other adverse effects, ultimately impacting the engine's lifespan. Furthermore, if fuel system components experience reliability issues during prolonged engine operation, and the vessel loses power while at sea, it poses a significant safety hazard. Summary of the Invention

[0003] To address the aforementioned shortcomings, the technical problem to be solved by this invention is to provide an engine health management method and system that determines whether the engine is operating abnormally by measuring the exhaust temperature of a single cylinder and controls the engine's operating boundaries to achieve healthy engine operation and safe operation of the ship.

[0004] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0005] An engine health management method includes the following steps:

[0006] S1. Obtain the exhaust temperature of each cylinder. ,in Cylinder serial number;

[0007] S2. Calculate the average exhaust temperature based on the exhaust temperatures of all cylinders. Maximum exhaust temperature and minimum exhaust temperature ;

[0008] S3, Judgment Is it greater than or equal to the preset first temperature threshold? ;

[0009] judge Is it greater than or equal to the preset second temperature threshold t?

[0010] S4, if Greater than or equal to the preset first temperature threshold ,or, If the temperature is greater than or equal to the preset second temperature threshold t, a corresponding correction signal is generated.

[0011] S5. Based on the correction signal, adjust the oil quantity of each cylinder, and the... The cylinder oil quantity adjustment amount is ,

[0012] S6, Judgment Is it greater than the maximum corrected oil level? ;

[0013] S7, if Not greater than the maximum corrected oil volume Execute S5;

[0014] if Greater than the maximum corrected oil quantity ,judge Is it greater than or equal to the preset first temperature threshold? ,if Not greater than or equal to the preset first temperature threshold Execute S1 if Greater than or equal to the preset first temperature threshold This generates a corresponding alarm signal;

[0015] S8. Based on the alarm signal, issue the first... An abnormal combustion signal is sent to the engine monitoring system, prompting the engine to stop and inspect.

[0016] In a preferred embodiment, S4 further includes: if Greater than or equal to the preset first temperature threshold , If the temperature is less than the preset second temperature threshold t, determine the first... Cylinder exhaust temperature Is it greater than the average exhaust temperature? If the first Cylinder exhaust temperature greater than average exhaust temperature , thereby generating the corresponding first correction signal;

[0017] S5 includes: reducing the first correction signal according to the first correction signal. Increase the fuel level in cylinder A, and increase the fuel level in the remaining cylinders, and in cylinder B... The cylinder oil quantity adjustment amount is , .

[0018] In a preferred embodiment, S4 further includes: if Greater than or equal to the preset first temperature threshold , If the temperature is less than the preset second temperature threshold t, determine the first... Cylinder exhaust temperature Is it lower than the average exhaust temperature? If the first Cylinder exhaust temperature Less than average exhaust temperature , thereby generating the corresponding second correction signal;

[0019] S5 includes: according to the second correction signal, adding the... Reduce the oil level in cylinder A, decrease the oil level in the remaining cylinders, and... The cylinder oil quantity adjustment amount is , .

[0020] In a preferred embodiment, S4 further includes: if If the temperature is greater than or equal to the preset second temperature threshold t, a corresponding third correction signal is generated.

[0021] The S5 further includes: reducing, based on the third correction signal, [the following is also mentioned:] oil quantity corresponding to cylinder Increase oil quantity corresponding to cylinder ;

[0022] The S7 further includes: if Greater than the preset correction oil quantity ,judge Is it greater than or equal to the first temperature threshold? ;

[0023] if Greater than or equal to the first temperature threshold Execute S1 if Not greater than or equal to the first temperature threshold Then and Compare;

[0024] like Greater than This generates the corresponding maximum cylinder alarm signal;

[0025] like equal Generate the corresponding maximum and minimum cylinder alarm signals;

[0026] like Less than Generate the corresponding minimum cylinder alarm signal;

[0027] S8 further includes:

[0028] Based on the alarm signal of the maximum cylinder number, an alarm is issued. The engine monitor sends a signal indicating an abnormal combustion in one cylinder and alerts the user to stop the engine for inspection.

[0029] Based on the maximum and minimum cylinder alarm signals, issue and The engine monitor sends a signal indicating an abnormal combustion in one cylinder and alerts the user to stop the engine for inspection.

[0030] Based on the minimum cylinder alarm signal, issue An abnormal combustion signal in one cylinder is sent to the engine monitoring system, prompting the user to stop the engine and perform a check.

[0031] In a preferred embodiment, step S5 includes: adjusting the first step according to the correction signal. The amount of oil in cylinder 1 and the remaining cylinders, and the amount of oil in cylinder 2. The cylinder oil quantity adjustment amount is The sum of the oil volume adjustments for the remaining cylinders is .

[0032] The preferred method further includes the following steps:

[0033] S9. Time alarm duration: Determine if the alarm duration is greater than the preset time value;

[0034] S10. If the alarm time exceeds the preset time value, output a prompt to the user to confirm whether to continue running.

[0035] S11. If the user confirms that they do not want to continue running, the engine will run to idle or stop.

[0036] If the user confirms to continue running, obtain the pre-calibrated running parameters and run according to the calibration parameters.

[0037] The preferred method is to adjust the fuel quantity of each cylinder by controlling the flow rate of the fuel injection pump, or by controlling the opening and closing time of the fuel injector.

[0038] An engine health management system includes an electronic control unit, and injectors, an injection pump, and an engine monitoring device, all electrically connected to the electronic control unit. It also includes components electrically connected to the electronic control unit:

[0039] Temperature acquisition and processing unit, the temperature acquisition and processing unit is used to acquire the exhaust temperature of each cylinder. And based on the exhaust temperatures of all cylinders, the average exhaust temperature is obtained. Maximum exhaust temperature and minimum exhaust temperature ,in Cylinder serial number;

[0040] The modified startup determination unit is used to determine... Is it greater than or equal to the preset first temperature threshold? ,judge Is it greater than or equal to the preset second temperature threshold t? If Greater than or equal to the preset first temperature threshold ,or, If the temperature is greater than or equal to the preset second temperature threshold t, a corresponding correction signal is generated.

[0041] The correction unit is used to adjust the oil quantity of each cylinder according to the correction signal, and the first... The cylinder oil quantity adjustment amount is Cumulative oil volume ,judge Is it greater than the maximum corrected oil level? ;if Not greater than the maximum corrected oil volume Repeated corrections, if Greater than the maximum corrected oil quantity ,judge Is it greater than or equal to the preset first temperature threshold? ,if Not greater than or equal to the preset first temperature threshold Complete the correction, if Greater than or equal to the preset first temperature threshold This generates a corresponding alarm signal;

[0042] An alarm unit, wherein the alarm unit is used to issue a first alarm signal based on the alarm signal. An abnormal combustion signal is sent to the engine monitoring system, prompting the engine to stop and inspect.

[0043] In a preferred embodiment, the system further includes a bypass control unit electrically connected to the electronic control unit. The bypass control unit is used to time the alarm duration when an alarm signal is issued, and determine whether the alarm duration is greater than a preset time value. If the alarm duration is greater than the preset time value, it outputs a prompt for user confirmation on whether to continue operation. If the user confirms not to continue operation, the engine runs to idle speed or stops. If the user confirms to continue operation, it acquires pre-calibrated operating parameters and operates according to the calibrated operating parameters.

[0044] In a preferred embodiment, the system further includes a preset unit electrically connected to the electronic control unit. The preset unit is used to sequentially limit the engine shaft torsional vibration, engine vibration, exhaust temperature, and speed fluctuation under different cylinder non-operation conditions through simulation and testing. Under reliable engine operating conditions, it limits the maximum operating speed and fuel injection quantity, and calibrates it as a limit map.

[0045] After adopting the above technical solution, the beneficial effects of the present invention are:

[0046] Since the engine health management method and system of the present invention are based on the fact that when the fuel system components of the engine deteriorate, the exhaust temperature of each cylinder of the engine will be abnormal, the present invention first obtains the exhaust temperature of each cylinder. Then, based on the exhaust temperatures of all cylinders, the average exhaust temperature is obtained. Maximum exhaust temperature and minimum exhaust temperature Then and As a correction boundary condition, correction begins when the correction boundary condition is met, adjusting the fuel quantity of each cylinder, and the... The cylinder oil quantity adjustment amount is , When the cumulative oil volume Greater than the maximum corrected oil quantity ,or Not greater than or equal to the preset first temperature threshold When the correction is completed, if Greater than the maximum corrected oil quantity , Still greater than or equal to the preset first temperature threshold , issued the first An abnormal combustion signal is sent to the engine monitoring system, prompting the engine to stop and inspect. Therefore, this invention determines whether the engine is malfunctioning based on the exhaust temperature of a single cylinder measured by a single-cylinder exhaust temperature sensor. By correcting boundary conditions and controlling engine operating boundaries, it aims to achieve healthy engine operation and safe marine operation. Attached Figure Description

[0047] Figure 1 This is a flowchart illustrating the engine health management method of the present invention;

[0048] Figures 2a-2b This is a flowchart illustrating the implementation details;

[0049] Figure 3 This is a schematic diagram of the engine health management system. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0051] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0052] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0053] The functionality of this invention consists of seven parts: exhaust temperature sensors (the number of sensors is the same as the number of cylinders) arranged on the exhaust pipe of a single cylinder of the engine, engine wiring harness, electronic control unit (ECU), electronically controlled unit fuel injection pump, high-pressure fuel pipe, fuel injector assembly, and engine body. The injection timing and injection quantity of the electronically controlled unit fuel injection pump are controlled by the ECU. Taking a 6-cylinder inline engine as an example.

[0054] The exhaust temperature sensor monitors the exhaust temperature of each cylinder in the engine. At the same time, the exhaust temperature sensor converts the exhaust temperature of each cylinder into a corresponding temperature signal. The temperature signal is transmitted to the electronic control unit (ECU) through the engine wiring harness. Based on the received exhaust temperature sensor signal, the ECU transmits the control through the engine wiring harness to control the solenoid valve of the electronic fuel injection pump, and assists in controlling the opening, closing, and opening duration of the solenoid valve of the electronic fuel injection pump. The fuel output by the electronic fuel injection pump reaches the injector through the high-pressure fuel line and is injected into the engine cylinder.

[0055] Example 1:

[0056] like Figure 1 As shown, an engine health management method includes the following steps:

[0057] Step S1: Obtain the exhaust temperature of each cylinder. ,in Cylinder serial number; At that time, the exhaust temperature includes , , , , and .

[0058] Step S2: Obtain the average exhaust temperature based on the exhaust temperatures of all cylinders. Maximum exhaust temperature and minimum exhaust temperature ;in + + + + + .

[0059] Step S3, Judgment Is it greater than or equal to the preset first temperature threshold? That is, the judgment expression Is it valid?

[0060] judge Whether it is greater than or equal to the preset second temperature threshold t; that is, the judgment formula. Is it valid?

[0061] Step S4, if Greater than or equal to the preset first temperature threshold ,or, Greater than or equal to the preset second temperature threshold t, i.e. or , and generate the corresponding correction signal;

[0062] It should be noted that: when and At this time, the electronic control unit sends a command to the electronically controlled unit fuel injection pump to maintain the original fuel injection quantity, without the need for adjustment.

[0063] Step S5: Adjust the oil quantity of each cylinder according to the correction signal, and the... The cylinder oil quantity adjustment amount is Cumulative oil volume The adjustments include both increases and decreases.

[0064] The specific adjustments are divided into: The first Adjusting the fuel quantity in one cylinder and the fuel quantities in other cylinders: For example, if the abnormality in cylinder 2 is determined using the two formulas above, adjust the fuel quantity in cylinder 2, and adjust the fuel quantity in cylinder 2 to the preset value each time. The sum of the adjusted fuel quantities for the remaining cylinders (cylinder 1, cylinder 3, cylinder 4, cylinder 5, and cylinder 6) is: To maintain stable engine power, the fuel quantity in all other cylinders is adjusted uniformly, and the sum of the adjusted fuel quantities in all other cylinders is controlled to not exceed [a certain value]. In one preferred embodiment, the fuel quantity for each of the remaining cylinders is adjusted as follows: This embodiment is In addition, this invention ensures uniform operation of each cylinder by pre-setting the oil quantity value for each adjustment.

[0065] It should be noted that the present invention can adjust the amount of fuel in each cylinder by controlling the flow rate of the fuel injection pump, or by controlling the opening and closing time of the fuel injector.

[0066] Step S6, Judgment Is it greater than the maximum corrected oil level? That is, the judgment expression Is this true? (The maximum corrected oil quantity is also considered.) These are preset values, intended to ensure the reliability of engine operation.

[0067] Step S7, if Not greater than the maximum corrected oil volume ,Right now When the time comes, proceed to step S5;

[0068] if Greater than the maximum corrected oil quantity ,Right now At that time, make a judgment Is it greater than or equal to the preset first temperature threshold? That is, the judgment formula Is it valid?

[0069] if Not greater than or equal to the preset first temperature threshold ,Right now The correction is completed by executing S1.

[0070] if Greater than or equal to the preset first temperature threshold ,Right now This generates a corresponding alarm signal;

[0071] It should be noted that this application uses the maximum corrected oil volume. To limit the existence of abnormalities The number of times the oil level in the cylinder is adjusted should be avoided to prevent the first adjustment. Even when a cylinder malfunctions, ineffective fuel quantity adjustments should be made. If minor fuel quantity adjustments fail to resolve the issue, the machine should be stopped immediately for inspection to prevent further damage. Simultaneously, the maximum corrected fuel quantity should be utilized. To automatically implement the first The oil level in the cylinder was adjusted multiple times, causing the first... Normal combustion in each cylinder means that the uniformity of operation in each cylinder is ensured by fine-tuning the fuel quantity, so as to guarantee the performance of the engine and eliminate the need to stop for inspection.

[0072] Step S8: Based on the alarm signal, issue the first... An abnormal combustion signal is sent to the engine monitoring system, prompting the engine to stop and inspect.

[0073] The engine health management method of this invention addresses the issue of varying exhaust temperatures among engine cylinders due to deterioration of fuel system components. By using exhaust temperature sensors installed on the engine to monitor the exhaust temperature of each cylinder in real time, and by setting correction boundary conditions for the exhaust temperature, the method fine-tunes the fuel quantity in the cylinder exhibiting abnormalities when these conditions are met. By controlling the amount of each fuel quantity adjustment, the uniformity of operation across cylinders is ensured without requiring engine shutdown for inspection. Simultaneously, a maximum correction fuel quantity limits the number of adjustments required. If the abnormality persists after at least one correction, a warning is issued, prompting a shutdown to inspect the injector and injection pump of that cylinder, preventing the fault from escalating and affecting engine operation. Therefore, this invention improves the uniformity of operation across cylinders by adjusting the flow rate of the electronically controlled individual injection pumps, achieving the goals of healthy engine operation and safe marine operation. Furthermore, the method is simple to operate, low in cost, and easy to implement.

[0074] like Figure 2a and Figure 2b As shown, the fine-tuning of the fuel quantity in each cylinder includes the following specific situations:

[0075] In the first case, step S4 of the present invention further includes:

[0076] if Greater than or equal to the preset first temperature threshold , Less than the preset second temperature threshold t, that is and When; judge the first Cylinder exhaust temperature Is it greater than the average exhaust temperature? That is, the judgment formula Is it valid?

[0077] If the Cylinder exhaust temperature greater than average exhaust temperature ,Right now , thereby generating the corresponding first correction signal;

[0078] Step S5 includes:

[0079] Based on the first correction signal, reduce the... Increase the fuel level in cylinder A, and increase the fuel level in the remaining cylinders, and in cylinder B... The cylinder oil quantity adjustment amount is , .

[0080] It should be noted that: when ,and as well as At that time, the first Reduced cylinder oil volume To maintain stable engine power, the fuel quantity in each of the remaining cylinders is increased evenly. ,

[0081] When the engine includes 6 cylinders, The cumulative increase in oil volume for the remaining cylinders is: If after the first adjustment It still exists, the first The amount of oil in the cylinder continues to decrease. The remaining cylinders continue to have their fuel quantity increased evenly, with the cumulative increase being [amount missing]. ,until Or reach maximum corrected oil level When the maximum corrected oil level is reached... and ECU reports the first A combustion abnormality signal is sent to the engine monitoring system, prompting the user to stop the engine and check the cylinder. Cylinder electronically controlled unit pump, oil pump, and fuel injector.

[0082] In the second case, step S4 also includes:

[0083] if Greater than or equal to the preset first temperature threshold , If the temperature is less than the preset second temperature threshold t, determine the first... Cylinder exhaust temperature Is it lower than the average exhaust temperature? ;

[0084] If the Cylinder exhaust temperature Less than average exhaust temperature , thereby generating the corresponding second correction signal;

[0085] Step S5 includes:

[0086] Based on the second correction signal, add the first... Reduce the oil level in cylinder A, decrease the oil level in the remaining cylinders, and... The cylinder oil quantity adjustment amount is , .

[0087] It should be noted that: when At that time, and as well as At that time, the first Increased cylinder oil volume To maintain stable engine power, the fuel level in each of the remaining cylinders is reduced uniformly, with the cumulative reduction being [amount missing]. If after the first adjustment It still exists, the first The amount of oil in the cylinder continues to increase. The remaining cylinders continue to reduce the fuel level evenly, with the cumulative reduction in fuel level being [amount missing]. ,until When the maximum corrected oil level is reached... and ECU reports the first A combustion abnormality signal is sent to the engine monitoring system, prompting the user to stop the engine and check the cylinder. Cylinder electronically controlled unit pump, oil pump, and fuel injector.

[0088] In the third case, step S4 also includes:

[0089] if If the temperature is greater than or equal to the preset second temperature threshold t, a corresponding third correction signal is generated.

[0090] Step S5 also includes:

[0091] According to the third correction signal, reduce oil quantity corresponding to cylinder Increase oil quantity corresponding to cylinder ;

[0092] Step S7 also includes:

[0093] if Greater than the preset correction oil quantity ,judge Is it greater than or equal to the first temperature threshold? ;

[0094] if Greater than or equal to the first temperature threshold Execute S1 if Not greater than or equal to the first temperature threshold Then and Compare;

[0095] like Greater than This generates the corresponding maximum cylinder alarm signal;

[0096] like equal Generate the corresponding maximum and minimum cylinder alarm signals;

[0097] like Less than Generate the corresponding minimum cylinder alarm signal;

[0098] Step S8 also includes:

[0099] Based on the alarm signal of the maximum cylinder number, an alarm is issued. The engine monitor sends a signal indicating an abnormal combustion in one cylinder and alerts the user to stop the engine for inspection.

[0100] Based on the maximum and minimum cylinder alarm signals, issue and The engine monitor sends a signal indicating an abnormal combustion in one cylinder and alerts the user to stop the engine for inspection.

[0101] Based on the minimum cylinder alarm signal, issue An abnormal combustion signal in one cylinder is sent to the engine monitoring system, prompting the user to stop the engine and perform a check.

[0102] It should be noted that: when hour, The corresponding cylinder oil quantity decreased , The corresponding cylinder's oil quantity increases by M. If after the first adjustment... The oil quantity per cylinder continues to decrease. , The oil quantity per cylinder continues to increase. ,until Or reach maximum corrected oil level If the maximum correction flow is reached... back If so, continue with the faulty cylinder determination process. At that time, the ECU reported The corresponding cylinder combustion abnormality signal is sent to the engine monitoring system to remind the user to stop and check. Corresponding to the electronically controlled unit injection pump and injector of the corresponding cylinder. When At that time, the ECU reported , The corresponding cylinder combustion abnormality signal is sent to the engine monitoring system, prompting the user to stop and check. , Corresponding to the cylinder-level electronically controlled unit injection pump and injector. When At that time, the ECU reported The corresponding cylinder combustion abnormality signal is sent to the engine monitoring system, reminding the user to stop and check.

[0103] The engine health management method of the present invention further includes the following steps:

[0104] S9. Time alarm duration: Determine if the alarm duration is greater than the preset time value;

[0105] S10. If the alarm time exceeds the preset time value, output a prompt to the user to confirm whether to continue running.

[0106] S11. If the user confirms that they do not want to continue running, the engine will run to idle or stop.

[0107] If the user confirms to continue running, obtain the pre-calibrated running parameters and run according to the calibration parameters.

[0108] Specifically, when the ECU reports a combustion abnormality in a certain cylinder and the alarm duration exceeds the set time t, the ECU sends an alarm signal again to the engine monitor: "Cylinder combustion abnormality, continue running?" The user can choose according to the actual situation. When "no" is selected, the engine returns to idle speed and stops. When "yes" is selected, the engine operates at the limit map.

[0109] The above steps are mainly for situations where the ECU reports a combustion abnormality in a certain cylinder. If the user is working on water at this time, stopping the engine could pose a safety hazard to the vessel. In order to ensure the reliability of the vessel and engine operation, the ECU will issue a command to stop the abnormal combustion fuel injection by limiting the engine speed and the amount of fuel in other cylinders. In this case, the set of operating parameters becomes the constraint map.

[0110] The constraint map calibration process is as follows: Based on relevant specifications, fuel injection is restricted to a specific cylinder of the engine. For example, in a 6-cylinder engine, one cylinder may be restricted from operating, and in an 8-cylinder engine, two cylinders may be restricted from operating. Taking a 6-cylinder engine as an example, through simulation and testing, the engine shaft torsional vibration, engine vibration, exhaust temperature, and speed fluctuations are sequentially restricted under different cylinder inoperability conditions. Under reliable engine operating conditions, the maximum operating speed and fuel injection quantity are restricted, and this is calibrated as the constraint map.

[0111] In summary, this invention fully utilizes the electronic control unit's ability to adjust the fuel injection quantity of individual units, ensures the implementation of the invention through a single-cylinder exhaust temperature sensor, and enables interaction between the engine and the user through an engine monitoring system. It sets the maximum correction amount for the fuel quantity of a single-cylinder electronically controlled unit pump and identifies cylinders with combustion abnormalities based on exhaust temperature and other parameters, pushing information to the user to facilitate quick fault location and repair. Furthermore, in situations where a cylinder of the engine experiences combustion abnormalities and the user is operating without power, posing a safety hazard, an engine limitation map is established to ensure the reliability of the ship and engine operation.

[0112] Example 2:

[0113] like Figure 3 As shown, an engine health management system includes an electronic control unit, and an injector, an injection pump, and an engine monitor, all electrically connected to the electronic control unit. It also includes, respectively, a temperature acquisition and processing unit, a corrective start determination unit, a correction unit, an alarm unit, an over-control unit, and a preset unit, all electrically connected to the electronic control unit.

[0114] The temperature acquisition and processing unit is used to acquire the exhaust temperature of each cylinder. And based on the exhaust temperatures of all cylinders, the average exhaust temperature is obtained. Maximum exhaust temperature and minimum exhaust temperature ,in Cylinder serial number;

[0115] Among them, the modified start-up determination unit is used to determine Is it greater than or equal to the preset first temperature threshold? ,judge Is it greater than or equal to the preset second temperature threshold t? If Greater than or equal to the preset first temperature threshold ,or, If the temperature is greater than or equal to the preset second temperature threshold t, a corresponding correction signal is generated.

[0116] The correction unit is used to adjust the oil quantity of each cylinder according to the correction signal, and the first... The cylinder oil quantity adjustment amount is Cumulative oil volume ,judge Is it greater than the maximum corrected oil level? ;if Not greater than the maximum corrected oil volume Repeated corrections, if Greater than the maximum corrected oil quantity ,judge Is it greater than or equal to the preset first temperature threshold? ,if Not greater than or equal to the preset first temperature threshold Complete the correction, if Greater than or equal to the preset first temperature threshold The corresponding alarm signal is generated. In this embodiment, the correction unit specifically corrects three cases, which are the same as in Embodiment 1, and will not be described in detail here.

[0117] The alarm unit is used to issue the first alarm signal based on the alarm signal. An abnormal combustion signal is sent to the engine monitoring system, prompting the engine to stop and inspect.

[0118] The over-control unit is used to time the alarm time when an alarm signal is issued and to determine whether the alarm time is greater than a preset time value. If the alarm time is greater than the preset time value, it outputs a prompt for the user to confirm whether to continue running. If the user confirms not to continue running, the engine runs to idle speed or stops. If the user confirms to continue running, it obtains the pre-calibrated operating parameters and runs according to the calibrated operating parameters.

[0119] The preset unit is used to limit the engine shaft torsional vibration, engine vibration, exhaust temperature and speed fluctuation under different cylinder non-working conditions through simulation and testing. Under reliable engine operating conditions, it limits the maximum operating speed and fuel injection quantity, and is calibrated as a limit map.

[0120] like Figure 3 As shown, in the engine health management system of this invention, the temperature acquisition and processing unit collects the exhaust temperature of each cylinder in real time, and obtains the average exhaust temperature, maximum exhaust temperature, and minimum exhaust temperature, which are then converted into corresponding temperature signals and transmitted to the electronic control unit. The electronic control unit then transmits the received temperature signals to the correction start determination unit, which compares the received temperature signals with boundary conditions. and After combination, a correction signal is obtained and transmitted to the electronic control unit.

[0121] The electronic control unit then transmits a correction signal to the correction unit. Based on this signal, the correction unit makes corresponding minor adjustments to the fuel level and, depending on the actual situation, either exits the correction or sends an alarm signal to the electronic control unit. The electronic control unit then transmits an alarm signal to the alarm unit, which issues a corresponding alarm notification. Additionally, when the alarm time exceeds a preset value, the electronic control unit triggers a trip control unit, which then issues a notification allowing the user to choose whether to continue operation or not. The user can input their selection through a human-machine interface such as a trip control switch.

[0122] As can be seen, this invention establishes a single-cylinder exhaust temperature correction activation boundary, as well as a single-flow fuel quantity and a maximum correction fuel quantity, under the condition of cracking of fuel system components during engine operation. When the maximum correction fuel quantity is not reached, fuel quantity correction ensures the uniformity of operation of each cylinder. When the maximum correction fuel quantity is reached and an alarm is triggered, the faulty cylinder is determined by the correction boundary conditions. At the same time, the engine limitation map sequentially limits the engine shaft torsional vibration, engine vibration, exhaust temperature, and speed fluctuation under different cylinder inoperation conditions. Under reliable engine operation conditions, the maximum operating speed and fuel injection quantity are limited and calibrated as the limitation map. Under these conditions, reliable operation of the ship and engine can be guaranteed.

[0123] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications or improvements to the same engine health management method and system made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An engine health management method, characterized in that, Includes the following steps: S1. Obtain the exhaust temperature of each cylinder. ,in Cylinder serial number; S2. Calculate the average exhaust temperature based on the exhaust temperatures of all cylinders. Maximum exhaust temperature and minimum exhaust temperature ; S3, Judgment Is it greater than or equal to the preset first temperature threshold? ; judge Is it greater than or equal to the preset second temperature threshold? ; S4, if Greater than or equal to the preset first temperature threshold ,or, If the temperature is greater than or equal to the preset second temperature threshold t, a corresponding correction signal is generated. S5. Based on the correction signal, adjust the oil quantity of each cylinder, and the... The cylinder oil quantity adjustment amount is , S6, Judgment Is it greater than the maximum corrected oil level? ; S7, if Not greater than the maximum corrected oil volume Execute S5; if Greater than the maximum corrected oil quantity ,judge Is it greater than or equal to the preset first temperature threshold? ,if Not greater than or equal to the preset first temperature threshold Execute S1 if Greater than or equal to the preset first temperature threshold This generates a corresponding alarm signal; S8. Based on the alarm signal, issue the first... The abnormal combustion signal in the cylinder is sent to the engine monitoring system, prompting the engine to stop and check. S4 further includes: if If the temperature is greater than or equal to the preset second temperature threshold t, a corresponding third correction signal is generated. The S5 also includes: According to the third correction signal, reduce oil quantity corresponding to cylinder Increase oil quantity corresponding to cylinder ; The S7 also includes: if Greater than the preset correction oil quantity ,judge Is it greater than or equal to the first temperature threshold? ; if Greater than or equal to the first temperature threshold Execute S1 if Not greater than or equal to the first temperature threshold Then and Compare; like Greater than This generates the corresponding maximum cylinder alarm signal; like equal Generate the corresponding maximum and minimum cylinder alarm signals; like Less than Generate the corresponding minimum cylinder alarm signal; S8 further includes: Based on the alarm signal of the maximum cylinder number, an alarm is issued. The engine monitor sends a signal indicating an abnormal combustion in one cylinder and alerts the user to stop the engine for inspection. Based on the maximum and minimum cylinder alarm signals, issue and The engine monitor sends a signal indicating an abnormal combustion in one cylinder and alerts the user to stop the engine for inspection. Based on the minimum cylinder alarm signal, issue An abnormal combustion signal in one cylinder is sent to the engine monitoring system, prompting the user to stop the engine and perform a check.

2. The engine health management method according to claim 1, characterized in that, S4 further includes: if Greater than or equal to the preset first temperature threshold , If the temperature is less than the preset second temperature threshold t, determine the first... Cylinder exhaust temperature Is it greater than the average exhaust temperature? ; If the Cylinder exhaust temperature greater than average exhaust temperature , thereby generating the corresponding first correction signal; S5 includes: Based on the first correction signal, reduce the... Increase the fuel level in cylinder A, and increase the fuel level in the remaining cylinders, and in cylinder B... The cylinder oil quantity adjustment amount is , .

3. The engine health management method according to claim 1, characterized in that, S4 further includes: if Greater than or equal to the preset first temperature threshold , If the temperature is less than the preset second temperature threshold t, determine the first... Cylinder exhaust temperature Is it lower than the average exhaust temperature? ; If the Cylinder exhaust temperature Less than average exhaust temperature , thereby generating the corresponding second correction signal; S5 includes: Based on the second correction signal, add the first... Reduce the oil level in cylinder A, decrease the oil level in the remaining cylinders, and... The cylinder oil quantity adjustment amount is , .

4. The engine health management method according to claim 1, characterized in that, S5 includes: Adjust the first according to the correction signal. The amount of oil in cylinder 1 and the remaining cylinders, and the amount of oil in cylinder 2. The cylinder oil quantity adjustment amount is The sum of the oil volume adjustments for the remaining cylinders is .

5. The engine health management method according to any one of claims 1 to 4, characterized in that, It also includes the following steps: S9. Time alarm duration: Determine if the alarm duration is greater than the preset time value; S10. If the alarm time exceeds the preset time value, output a prompt to the user to confirm whether to continue running. S11. If the user confirms that they do not want to continue running, the engine will run to idle or stop. If the user confirms to continue running, obtain the pre-calibrated running parameters and run according to the calibration parameters.

6. The engine health management method according to claim 1, characterized in that, The amount of fuel in each cylinder can be adjusted by controlling the flow rate of the fuel injection pump, or by controlling the opening and closing time of the fuel injectors.

7. An engine health management system, comprising an electronic control unit, and an injector, an injection pump, and an engine monitoring instrument, all electrically connected to the electronic control unit, characterized in that, It also includes those electrically connected to the electronic control unit respectively: Temperature acquisition and processing unit, the temperature acquisition and processing unit is used to acquire the exhaust temperature of each cylinder. And based on the exhaust temperatures of all cylinders, the average exhaust temperature is obtained. Maximum exhaust temperature and minimum exhaust temperature ,in Cylinder serial number; The modified startup determination unit is used to determine... Is it greater than or equal to the preset first temperature threshold? ,judge Is it greater than or equal to the preset second temperature threshold t? If Greater than or equal to the preset first temperature threshold ,or, If the temperature is greater than or equal to the preset second temperature threshold t, a corresponding correction signal is generated. The correction unit is used to adjust the oil quantity of each cylinder according to the correction signal, and the first... The cylinder oil quantity adjustment amount is Cumulative oil volume ,judge Is it greater than the maximum corrected oil level? ;if Not greater than the maximum corrected oil volume Repeated corrections, if the cumulative oil volume Greater than the maximum corrected oil quantity ,judge Is it greater than or equal to the preset first temperature threshold? ,if Not greater than or equal to the preset first temperature threshold Complete the correction, if Greater than or equal to the preset first temperature threshold This generates a corresponding alarm signal; An alarm unit, wherein the alarm unit is used to issue a first alarm signal based on the alarm signal. The abnormal combustion signal in the cylinder is sent to the engine monitoring system, prompting the engine to stop and check. The correction start determination unit is in When the temperature is greater than or equal to the preset second temperature threshold t, the generated correction signal is the third correction signal; The correction unit is used to reduce, according to the third correction signal. oil quantity corresponding to cylinder Increase oil quantity corresponding to cylinder ;if Greater than the preset correction oil quantity ,judge Is it greater than or equal to the first temperature threshold? ;if Greater than or equal to the first temperature threshold Repeated corrections, if Not greater than or equal to the first temperature threshold Then and Compare; if Greater than Generate the corresponding maximum cylinder alarm signal; if equal Generate the corresponding maximum and minimum cylinder alarm signals; if Less than Generate the corresponding minimum cylinder alarm signal; The alarm unit issues an alarm based on the maximum cylinder count alarm signal. A cylinder combustion abnormality signal is sent to the engine monitoring system, prompting the user to stop and inspect the engine; based on the maximum and minimum cylinder alarm signals, an alarm is issued. and A cylinder combustion abnormality signal is sent to the engine monitoring system, prompting the user to stop and inspect the engine; based on the minimum cylinder alarm signal, an alarm is issued. An abnormal combustion signal in one cylinder is sent to the engine monitoring system, prompting the user to stop the engine and perform a check.

8. The engine health management system according to claim 7, characterized in that, The system also includes a bypass control unit electrically connected to the electronic control unit. When an alarm signal is issued, the bypass control unit is used to time the alarm time and determine whether the alarm time is greater than a preset time value. If the alarm time is greater than the preset time value, it outputs a prompt for user confirmation on whether to continue running. If the user confirms not to continue running, the engine runs to idle speed or stops. If the user confirms to continue running, it obtains the pre-calibrated operating parameters and runs according to the calibrated operating parameters.

9. The engine health management system according to claim 7, characterized in that, The system also includes a preset unit electrically connected to the electronic control unit. The preset unit is used to limit the engine shaft torsional vibration, engine vibration, exhaust temperature and speed fluctuation under different cylinder non-working conditions through simulation and testing. Under reliable engine operating conditions, the maximum operating speed and fuel injection quantity are limited and calibrated as a limit map.

Images