A method, device and system for intelligent diagnosis of abnormal operation of diesel engine cylinders

Abstract

This invention discloses an intelligent diagnostic method for abnormal operation of diesel engine cylinders, comprising the following steps: acquiring the cylinder head outlet exhaust gas temperature, the flight time of the solenoid valve of the injection pump for each cylinder, and the crankcase pressure; based on the cylinder head outlet exhaust gas temperature of each cylinder, determining whether the cylinder head outlet exhaust gas temperature is abnormal when the diesel engine is operating under high conditions; when the cylinder head outlet exhaust gas temperature is abnormal, determining the cause of the abnormal operation of the diesel engine cylinders by sequentially comparing the cylinder injection pump solenoid valve flight time, cylinder head outlet exhaust gas temperature, and diesel engine crankcase pressure with their respective threshold values, based on the solenoid valve flight time, cylinder head outlet exhaust gas temperature, and diesel engine crankcase pressure. This method enables monitoring, automatic alarm, and intelligent diagnosis of abnormalities in the working state of diesel engine cylinders, improving the timeliness of diesel engine operation and maintenance, and reducing operation and maintenance costs.

Description

Technical Field

[0001] This invention belongs to the field of fully automated products and relates to an intelligent diagnostic method, device and system for abnormal operation of diesel engine cylinders. Background Technology

[0002] The main components responsible for combustion and power generation in diesel engine cylinders include the intake and exhaust valve system, fuel injection pump and injectors, and combustion chamber (cylinder head, piston, cylinder liner). Malfunction of any component can affect the working condition of a single cylinder and the overall engine power output, and may even cause serious mechanical failures. Therefore, it is necessary to monitor and diagnose the working condition of diesel engine cylinders. With the rapid development of modern industrial technology, especially sensing technology, embedded systems, and big data-based information technology, the diagnosis of abnormal diesel engine cylinder working conditions can evolve towards intelligent systems.

[0003] Currently, some diesel engines only use a small amount of sensor data to monitor and alarm the cylinder's working status, and generally do not have complete intelligent diagnostic capabilities for abnormal cylinder working.

[0004] Current diesel engine cylinder power status monitoring technology has the following limitations:

[0005] 1) The cylinder working status monitoring items are incomplete. After the alarm is issued, there is no intelligent diagnostic method to find the root cause of the fault and provide maintenance suggestions. The cause analysis is based solely on traditional manual experience, which is not timely.

[0006] 2) Some diesel engines have begun to establish a function to push maintenance suggestions after the cylinder working status alarm, but multi-parameter fusion diagnosis has not been implemented. The logic is relatively simple, the accuracy of the diagnosis results is not high, and the maintenance suggestions do not have a clear direction. This part is the core and difficulty of the intelligent fault diagnosis system. Summary of the Invention

[0007] To address the aforementioned problems, the present invention provides a technical solution: an intelligent diagnostic method for abnormal operation of a diesel engine cylinder, comprising the following steps:

[0008] Obtain the cylinder head outlet exhaust gas temperature, the flight time of the solenoid valve of the fuel injection pump of each cylinder, and the crankcase pressure of each cylinder;

[0009] Based on the exhaust gas temperature at the cylinder head outlet of each cylinder of the diesel engine, determine whether there is any abnormality in the exhaust gas temperature at the cylinder head outlet of the diesel engine cylinder when the diesel engine is running under high operating conditions.

[0010] When the exhaust gas temperature at the cylinder head outlet of a diesel engine cylinder is abnormal, the cause of the abnormal operation of the diesel engine cylinder is determined by comparing the flight time of the cylinder injection pump solenoid valve, the exhaust gas temperature at the cylinder head outlet, and the crankcase pressure of the diesel engine with their respective threshold values.

[0011] Furthermore: the process of determining whether there is an abnormality in the exhaust gas temperature at the cylinder head outlet of each cylinder of the diesel engine when the diesel engine is running under high operating conditions, based on the exhaust gas temperature at the cylinder head outlet of each cylinder, is as follows:

[0012] ˉ

[0013] First, calculate the average exhaust gas temperature T at the outlet of all cylinder heads when the diesel engine oil is running under high operating conditions.

[0014] ˉ

[0015] Then calculate the exhaust gas temperature T at the outlet of the nth cylinder head. n The difference between the average value `T and the value ΔTn = Tn - T, where n = 1…N; N represents the total number of cylinders.

[0016] If ΔT n ≥ Set exhaust temperature over-threshold T H , or ΔT n <Set exhaust temperature too low threshold T L If the temperature of the nth cylinder remains abnormal for a certain period of time, it is determined that the temperature of the exhaust gas at the cylinder head outlet of the diesel engine cylinder is abnormal.

[0017] Furthermore: When the exhaust gas temperature at the cylinder head outlet of the diesel engine cylinder is abnormal, the specific process for determining the cause of the abnormal operation of the diesel engine cylinder is as follows: Based on the flight time of the cylinder injection pump solenoid valve, the exhaust gas temperature at the cylinder head outlet, and the crankcase pressure of the diesel engine, the method of sequentially comparing the flight time of the cylinder injection pump solenoid valve, the exhaust gas temperature at the cylinder head outlet, and the crankcase pressure of the diesel engine with their respective threshold values ​​is as follows:

[0018] When the flight time of the solenoid valve of the fuel injection pump of the nth cylinder is t n When the flight time of the cylinder injection pump solenoid valve is within the normal threshold range, it is then determined whether the exhaust gas temperature at the outlet of the nth cylinder head is too high.

[0019] When the flight time of the solenoid valve of the fuel injection pump of the nth cylinder is t n If the flight time of the cylinder injection pump solenoid valve is outside the normal threshold range, the cause of the fault is determined to be: a fault in the nth cylinder injection pump or a fault in the injection pump cable. The maintenance suggestion is: observe the operation during operation, and check the nth cylinder injection pump and the injection pump cable in sequence after shutdown.

[0020] Furthermore, the process for determining whether the exhaust gas temperature at the outlet of the nth cylinder head is too high is as follows:

[0021] ˉ

[0022] When the exhaust gas temperature at the outlet of the nth cylinder head is T n The difference ΔT between the average value T n ≥ Set exhaust temperature over-threshold T H If the cause of the fault is determined to be: poor atomization of the injector in the nth cylinder or excessive fuel injection by the fuel injection pump, the maintenance suggestion is: observe the operation during operation, and check the injector and fuel injection pump of the nth cylinder in sequence after shutdown.

[0023] ˉ

[0024] When the exhaust gas temperature at the outlet of the nth cylinder head is T n The difference ΔT between the average value T n <Set exhaust temperature over-threshold T H If so, it can be determined whether the crankcase pressure P of the diesel engine is too high.

[0025] Furthermore, the process for determining whether the diesel engine crankcase pressure P is too high is as follows:

[0026] When the diesel engine crankcase pressure P > pressure threshold, the cause of the fault is determined to be: leakage in the fuel line of cylinder n, poor sealing of the combustion chamber, or abnormal intake and exhaust valves. Maintenance recommendation: Immediately stop the engine and sequentially check the fuel line of cylinder n, piston and cylinder liner, and intake and exhaust valves.

[0027] When the crankcase pressure P ≤ the pressure threshold, it is determined that the fuel injection pump of cylinder n is faulty or the fuel injection pump cable is faulty. The maintenance suggestion is: observe the operation during operation, and check the fuel injection pump of cylinder n and the fuel injection pump cable in sequence after shutdown.

[0028] Furthermore, it also includes providing alarm prompts for diesel engine cylinders exhibiting abnormal operation.

[0029] An intelligent diagnostic device for abnormal operation of diesel engine cylinders includes:

[0030] Acquisition module: used to acquire the cylinder head outlet exhaust gas temperature of each cylinder of the diesel engine, the flight time of the solenoid valve of the fuel injection pump of each cylinder, and the crankcase pressure;

[0031] Judgment module: Used to determine whether there is any abnormality in the exhaust gas temperature at the cylinder head outlet of the diesel engine cylinders when the diesel engine is running under high operating conditions, based on the exhaust gas temperature at the cylinder head outlet of each cylinder.

[0032] Fault diagnosis module: When there is an abnormality in the exhaust gas temperature at the cylinder head outlet of the diesel engine cylinder, it uses the method of comparing the flight time of the cylinder injection pump solenoid valve, the exhaust gas temperature at the cylinder head outlet, and the crankcase pressure of the diesel engine with their respective threshold values ​​to determine the cause of the abnormal operation of the diesel engine cylinder.

[0033] Alarm module: Used to provide alarm prompts when there is abnormal oil inlet pressure.

[0034] An intelligent diagnostic system for abnormal operation of diesel engine cylinders includes a data acquisition module that collects data on the exhaust gas temperature at the cylinder head outlet of each cylinder, the flight time of the solenoid valve of each cylinder's fuel injection pump, and the crankcase pressure.

[0035] Based on the cylinder head outlet exhaust gas temperature, the flight time of the fuel injection pump solenoid valve of each cylinder, and the crankcase pressure collected by the signal acquisition module, an intelligent diagnostic device for abnormal operation of diesel engine cylinders is used to determine the cause of the fault causing the oil inlet pressure, and to display alarms, fault causes, and maintenance suggestions for the abnormal operation.

[0036] This invention provides an intelligent diagnostic method, device, and system for diesel engine cylinder malfunctions. It scientifically and comprehensively monitors, automatically alarms, and intelligently diagnoses malfunctions in diesel engine cylinders. When a cylinder malfunctions, the system automatically locates the faulty component and provides maintenance suggestions, thereby improving the timeliness of diesel engine operation and maintenance and reducing operation and maintenance costs. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a flowchart of an intelligent diagnostic method for abnormal operation of the diesel engine cylinder;

[0039] Figure 2 This is a diagram showing the components of the intelligent diagnostic system for abnormal operation of the diesel engine cylinder. Detailed Implementation

[0040] It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0043] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0044] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0045] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0046] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0047] Figure 1 This is a flowchart of an intelligent diagnostic method for abnormal operation of the diesel engine cylinder;

[0048] A smart diagnostic method for abnormal operation of diesel engine cylinders includes the following steps:

[0049] S1: Obtain the cylinder head outlet exhaust gas temperature, the flight time of the solenoid valve of the fuel injection pump of each cylinder of the diesel engine, and the crankcase pressure.

[0050] S2: Based on the exhaust gas temperature at the cylinder head outlet of each cylinder of the diesel engine, determine whether there is any abnormality in the exhaust gas temperature at the cylinder head outlet of the diesel engine cylinder when the diesel engine is running under high operating conditions.

[0051] S3: When the exhaust gas temperature at the cylinder head outlet of the diesel engine cylinder is abnormal, the cause of the abnormal operation of the diesel engine cylinder is determined by comparing the flight time of the cylinder injection pump solenoid valve, the exhaust gas temperature at the cylinder head outlet, and the crankcase pressure of the diesel engine with their respective threshold values.

[0052] S4: Provides an alarm for abnormal operation of diesel engine cylinders.

[0053] The intelligent diagnostic method for abnormal operation of the diesel engine cylinder runs in the PLC software;

[0054] Steps S1 / S2 / S3 / S4 are executed sequentially;

[0055] Furthermore, the process of determining whether the exhaust gas temperature at the cylinder head outlet of each cylinder is abnormal when the diesel engine oil is running under high operating conditions, based on the exhaust gas temperature at the cylinder head outlet of each cylinder, is as follows:

[0056] ˉ

[0057] First, calculate the average exhaust gas temperature T at the outlet of all cylinder heads when the diesel engine oil is running under high operating conditions.

[0058] ˉ

[0059] Then calculate the exhaust gas temperature T at the outlet of the nth cylinder head. n The difference between the average value `T` and the value ΔTn = Tn - T, where n = 1…N; N represents the total number of cylinders; the value of N is usually determined by the specific diesel engine. Taking diesel engines in internal combustion locomotives as an example, they are usually 16-cylinder and 12-cylinder diesel engines, and there are also 6-cylinder and 8-cylinder diesel engines.

[0060] If ΔT n ≥ Set exhaust temperature over-threshold T H , or ΔT n <Set exhaust temperature too low threshold T L If the temperature remains abnormal for a certain period of time, it is determined that the nth cylinder is malfunctioning, specifically indicating an abnormal exhaust gas temperature at the cylinder head outlet of the diesel engine. The PLC software program will then trigger an alarm for this abnormal exhaust gas temperature. This "certain period of time" is typically 60 seconds or more, used to filter out unstable temperature conditions caused by changes in engine speed and load.

[0061] If the fuel injection quantity is too high or the combustion is rough due to poor fuel injector atomization, it can lead to excessively high exhaust gas temperature at the cylinder head outlet, for example, if the set exhaust temperature threshold T is too high. H =40℃;

[0062] If the fuel injection quantity is too low or combustion is insufficient due to poor intake or cylinder sealing, the exhaust gas temperature at the cylinder head outlet will be too low. For example, if the set exhaust temperature threshold T is too low. L =60℃;

[0063] When a diesel engine operates under low operating conditions, due to environmental differences and variations in the performance of the injection pump and injectors, significant differences in the exhaust gas temperature at the cylinder head outlets may occur. This should not be considered an abnormal cylinder working condition. Therefore, the PLC software should be programmed with the following activation conditions for an abnormal cylinder head exhaust gas temperature alarm: when the average exhaust gas temperature `T` of all cylinder head outlets is lower than T0 (T0 being the boundary between high and low operating conditions), the abnormal cylinder head exhaust gas temperature alarm function should be disabled. The T0 value is generally set to 80%–90% of the average exhaust gas temperature at the cylinder head outlets under the calibrated operating conditions, for example, 500℃.

[0064] Furthermore: When the exhaust gas temperature at the cylinder head outlet of the diesel engine cylinder is abnormal, the specific process for determining the cause of the abnormal operation of the diesel engine cylinder is as follows: Based on the flight time of the cylinder injection pump solenoid valve, the exhaust gas temperature at the cylinder head outlet, and the crankcase pressure of the diesel engine, the method of sequentially comparing the flight time of the cylinder injection pump solenoid valve, the exhaust gas temperature at the cylinder head outlet, and the crankcase pressure of the diesel engine with their respective threshold values ​​is as follows:

[0065] When the alarm for abnormal exhaust gas temperature at the outlet of cylinder n is triggered, the flight time t of the solenoid valve of the fuel injection pump in cylinder n is first determined. n Is there any abnormality? t n The normal threshold, i.e. the normal flight time range of the fuel injection pump solenoid valve, is generally determined by testing. For example, the normal range is t = 1.15ms to 1.60ms.

[0066] When the flight time of the solenoid valve of the fuel injection pump of the nth cylinder is t n When the flight time of the cylinder injection pump solenoid valve is within the normal threshold range, it is then determined whether the exhaust gas temperature at the outlet of the nth cylinder head is too high.

[0067] When the flight time of the solenoid valve of the fuel injection pump of the nth cylinder is t n If the flight time of the cylinder injection pump solenoid valve is outside the normal threshold range, the cause of the fault is determined to be: a fault in the nth cylinder injection pump or a fault in the injection pump cable. The maintenance suggestion is: observe the operation during operation, and check the nth cylinder injection pump and the injection pump cable in sequence after shutdown.

[0068] The process for determining whether the exhaust gas temperature at the outlet of the nth cylinder head is too high is as follows:

[0069] ˉ

[0070] When the exhaust gas temperature at the outlet of the nth cylinder head is T n The difference ΔT between the average value T n ≥ Set exhaust temperature over-threshold T H If the cause of the fault is determined to be: poor atomization of the injector in the nth cylinder or excessive fuel injection by the fuel injection pump, the maintenance suggestion is: observe the operation during operation, and check the injector and fuel injection pump of the nth cylinder in sequence after shutdown.

[0071] ˉ

[0072] When the exhaust gas temperature at the outlet of the nth cylinder head is T n The difference ΔT between the average value T n <Set exhaust temperature over-threshold T H If so, it can be determined whether the crankcase pressure P of the diesel engine is too high.

[0073] The process for determining whether the diesel engine crankcase pressure P is too high is as follows:

[0074] When the crankcase pressure P of the diesel engine exceeds the pressure threshold, the cause of the fault is determined to be: leakage in the fuel line of the nth cylinder, poor sealing of the combustion chamber, or abnormal intake and exhaust valves. Maintenance recommendation: Stop the engine immediately and check the fuel line of the nth cylinder, piston and cylinder liner, and intake and exhaust valves in sequence.

[0075] The pressure threshold, or normal range of crankcase pressure, is generally determined by testing. For example, the normal range is no higher than 1.0 inch of water column.

[0076] When the crankcase pressure is less than or equal to the pressure threshold, the problem is determined to be a fault in the fuel injection pump of cylinder n or a fault in the fuel injection pump cable. The maintenance recommendation is to observe the operation during operation and check the fuel injection pump of cylinder n and the fuel injection pump cable in sequence after shutdown.

[0077] An intelligent diagnostic device for abnormal operation of diesel engine cylinders includes:

[0078] Acquisition module: used to acquire the cylinder head outlet exhaust gas temperature of each cylinder of the diesel engine, the flight time of the solenoid valve of the fuel injection pump of each cylinder, and the crankcase pressure;

[0079] Judgment module: Used to determine whether there is any abnormality in the exhaust gas temperature at the cylinder head outlet of the diesel engine cylinders when the diesel engine is running under high operating conditions, based on the exhaust gas temperature at the cylinder head outlet of each cylinder.

[0080] Fault diagnosis module: When there is an abnormality in the exhaust gas temperature at the cylinder head outlet of the diesel engine cylinder, it uses the method of comparing the flight time of the cylinder injection pump solenoid valve, the exhaust gas temperature at the cylinder head outlet, and the crankcase pressure of the diesel engine with their respective threshold values ​​to determine the cause of the abnormal operation of the diesel engine cylinder.

[0081] Alarm module: Used to provide alarm prompts when there is abnormal oil inlet pressure.

[0082] Figure 2 This is a diagram showing the components of the intelligent diagnostic system for abnormal operation of the diesel engine cylinder.

[0083] An intelligent diagnostic system for abnormal operation of diesel engine cylinders includes a data acquisition module that collects data on the exhaust gas temperature at the cylinder head outlet of each cylinder, the flight time of the solenoid valve of each cylinder's fuel injection pump, and the crankcase pressure.

[0084] The data acquisition module is the data acquisition terminal; the data acquisition terminal collects the working state of the diesel engine cylinders, and the acquisition module includes sensors installed on the diesel engine and a microcomputer processing unit for converting sensor signals;

[0085] The flight time of each cylinder's fuel injection pump solenoid valve is obtained from this data by the microcomputer controlling the fuel injection pump solenoid valve.

[0086] The circuit board or chip of the signal acquisition module converts the electrical signal output by the sensor into an analog signal, and has filtering and anti-electromagnetic interference capabilities;

[0087] Based on the cylinder head outlet exhaust gas temperature, the flight time of the fuel injection pump solenoid valve of each cylinder, and the crankcase pressure collected by the signal acquisition module, the intelligent diagnostic device for abnormal operation of diesel engine cylinders is used to determine the cause of the fault causing the oil inlet pressure, and displays the abnormal operation, fault cause, and maintenance suggestions.

[0088] The intelligent diagnostic device has server hardware and software or other equipment with large-capacity data storage (such as MongoDB database) and processing and analysis capabilities. In order to better realize the flexibility, scalability and portability of the system, the intelligent diagnostic device adopts a distributed structure, that is, it is divided into a judgment module, a fault diagnosis module and an alarm module, and each module is independent of each other.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An intelligent diagnosis method for diesel engine cylinder abnormal operation, characterized in that: The method comprises the following steps: Obtain the exhaust temperature at the cylinder head outlet of each cylinder of the diesel engine, the flight time of the electromagnetic valve of the fuel injection pump of each cylinder, and the crankcase pressure of the diesel engine; Determine whether the exhaust temperature at the cylinder head outlet of each cylinder of the diesel engine is abnormal when the diesel engine is running at a high load based on the exhaust temperature at the cylinder head outlet of each cylinder of the diesel engine; When the exhaust temperature at the cylinder head outlet of each cylinder of the diesel engine is abnormal, determine the cause of the abnormality of the diesel engine based on the flight time of the electromagnetic valve of the fuel injection pump, the exhaust temperature at the cylinder head outlet, and the crankcase pressure of the diesel engine by comparing the flight time of the electromagnetic valve of the fuel injection pump, the exhaust temperature at the cylinder head outlet, and the crankcase pressure of the diesel engine with their threshold values in sequence. The process of determining whether the exhaust temperature at the cylinder head outlet of each cylinder of the diesel engine is abnormal when the diesel engine is running at a high load based on the exhaust temperature at the cylinder head outlet of each cylinder of the diesel engine is as follows: First, calculate the average value of all the exhaust gas temperatures at the outlet of the cylinder head when the engine oil is running at high operating conditions T, and then calculate the nth cylinder head outlet exhaust gas temperature T n The difference value of the average value T Tn = Tn- T, n = 1...N; N represents the total number of cylinders; If T n ≥ set exhaust gas temperature excessively high threshold value T H , or T n < set exhaust gas temperature excessively low threshold value T L for a certain time, it is determined that the nth cylinder temperature is abnormal, that is, the exhaust gas temperature at the cylinder head outlet of the diesel engine cylinder is abnormal; The specific process of determining the cause of the abnormality of the diesel engine when the exhaust temperature at the cylinder head outlet of each cylinder of the diesel engine is abnormal based on the flight time of the electromagnetic valve of the fuel injection pump, the exhaust temperature at the cylinder head outlet, and the crankcase pressure of the diesel engine by comparing the flight time of the electromagnetic valve of the fuel injection pump, the exhaust temperature at the cylinder head outlet, and the crankcase pressure of the diesel engine with their threshold values in sequence is as follows: When the flight time t of the n-th cylinder fuel injection pump electromagnetic valve n When the flight time t of the n-th cylinder fuel injection pump electromagnetic valve is within the normal threshold range, whether the n-th cylinder head outlet exhaust gas temperature is too high is determined. When the flight time t of the electromagnetic valve of the fuel injection pump of the nth cylinder is not within the normal threshold range n If the flight time t of the electromagnetic valve of the fuel injection pump is not within the normal threshold range, it is determined that the cause of the fault is that the fuel injection pump of the nth cylinder is faulty or the fuel injection pump cable is faulty, and the operation and maintenance suggestion is that the operation is observed during operation, and the nth cylinder fuel injection pump and the fuel injection pump cable are checked in sequence after shutdown.

2. The intelligent diagnosis method of diesel cylinder abnormal operation according to claim 1, characterized in that: The process of determining whether the exhaust temperature at the cylinder head outlet of the nth cylinder is too high is as follows: When the nth cylinder head outlet exhaust gas temperature T n Average value Difference value of T T n ≥ Set exhaust gas temperature overhigh threshold T H The fault reason is that the atomization of the nth cylinder injector is poor or the injection amount of the injection pump is too large, and the operation and maintenance suggestion is to observe the operation during operation, and check the nth cylinder injector and injection pump in turn after shutdown. when the nth cylinder head outlet exhaust gas temperature T n average value difference of T T n <set exhaust gas temperature excessively high threshold value T H whether the diesel engine crankcase pressure P is excessively high.

3. The method of claim 2, wherein: The process of determining whether the crankcase pressure P of the diesel engine is too high is as follows: When the crankcase pressure P of the diesel engine is greater than the pressure threshold value, it is determined that the cause of the abnormality is that the fuel line of the nth cylinder is leaking, or the combustion chamber is not sealed properly, or the intake and exhaust valves are abnormal; the operation and maintenance suggestion is to stop the engine immediately and then sequentially check the fuel line of the nth cylinder, the piston and cylinder sleeve, and the intake and exhaust valves. When the crankcase pressure P of the diesel engine is less than or equal to the pressure threshold value, it is determined that the fuel injection pump of the nth cylinder is faulty or the fuel injection pump cable is faulty; the operation and maintenance suggestion is to observe the operation during running and then sequentially check the fuel injection pump of the nth cylinder and the fuel injection pump cable.

4. The intelligent diagnosis method of diesel cylinder abnormal operation according to claim 1, characterized in that: The method further comprises alarming and prompting the abnormality of the diesel engine.

5. An intelligent diagnostic device for applying the intelligent diagnostic method for abnormal operation of a diesel engine cylinder according to claim 1, characterized in that: The method comprises the following steps: An acquisition module is configured to acquire the exhaust temperature at the cylinder head outlet of each cylinder of the diesel engine, the flight time of the electromagnetic valve of the fuel injection pump of each cylinder, and the crankcase pressure of the diesel engine; A determination module is configured to determine whether the exhaust temperature at the cylinder head outlet of each cylinder of the diesel engine is abnormal when the diesel engine is running at a high load based on the exhaust temperature at the cylinder head outlet of each cylinder of the diesel engine; A fault diagnosis module is configured to determine the cause of the abnormality of the diesel engine when the exhaust temperature at the cylinder head outlet of each cylinder of the diesel engine is abnormal based on the flight time of the electromagnetic valve of the fuel injection pump, the exhaust temperature at the cylinder head outlet, and the crankcase pressure of the diesel engine by comparing the flight time of the electromagnetic valve of the fuel injection pump, the exhaust temperature at the cylinder head outlet, and the crankcase pressure of the diesel engine with their threshold values in sequence. An alarm module is configured to alarm and prompt the abnormality of the diesel engine.

6. An intelligent diagnosis system for abnormal operation of a diesel engine cylinder, characterized by: The method comprises the following steps: An acquisition module is configured to acquire the exhaust temperature at the cylinder head outlet of each cylinder of the diesel engine, the flight time of the electromagnetic valve of the fuel injection pump of each cylinder, and the crankcase pressure of the diesel engine; Based on the cylinder head exhaust gas temperature of each cylinder, the time of flight of each cylinder fuel injection pump electromagnetic valve and the crankcase pressure collected by the collection module, the intelligent diagnosis device as claimed in claim 5 is used to judge the cause of the oil inlet pressure failure, and to display the abnormal working condition, the cause of the failure and the operation and maintenance suggestions.

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