An intelligent diagnosis method and device for abnormal inlet pressure of high-temperature water in a locomotive diesel engine

Abstract

An intelligent diagnosis method for abnormal inlet pressure of high-temperature water in a locomotive diesel engine includes the following steps: obtaining the numerical values of the inlet pressure of high-temperature water in the diesel engine, the outlet pressure of high-temperature water, the rotational speed of the diesel engine, and the inlet pressure signal of the intermediate cooling water; when the diesel engine is operating at a certain rotational speed, if the inlet pressure P<subgt;in< / subgt; of the high-temperature water in the diesel engine is less than the low threshold ΔP<subgt;Hin< / subgt> of the inlet pressure of high-temperature water at this rotational speed and lasts for a certain period of time, it is determined that there is abnormal pressure at the inlet of high-temperature water; based on the numerical values of the outlet pressure of high-temperature water and the inlet pressure signal of the intermediate cooling water, by comparing the numerical values of the outlet pressure of high-temperature water, the rotational speed of the diesel engine, and the inlet pressure signal of the intermediate cooling water with their respective thresholds in sequence, the cause of the fault that causes the inlet pressure of high-temperature water in the diesel engine is judged. This method realizes the intelligent diagnosis of abnormal high-temperature water pressure, clarifies the cause of pressure abnormality and fault location, provides targeted operation and maintenance suggestions, and displays them in the on-vehicle diagnostic system, thereby improving the efficiency of operation and maintenance inspection.

Description

Technical Field

[0001] The present invention belongs to the technical field of diesel engine oil, and relates to an intelligent diagnosis method and device for abnormal inlet pressure of high-temperature water in a locomotive diesel engine. Background Art

[0002] The high-temperature water system of a diesel engine is a component of the diesel engine cooling system, and mainly provides a cooling function for the containment parts of the diesel engine combustion chamber, such as cylinder heads, cylinder liners, engine blocks, etc., so that they work within a reasonable and appropriate temperature range. At the same time, before the high-temperature water enters the diesel engine, it is cooled in the locomotive cooling system and flows through the oil cooler and fuel heat exchanger in the locomotive system pipeline for oil cooling and fuel preheating. The inlet pressure of high-temperature water is a key indicator for whether the high-temperature water system of the diesel engine is normal. An excessively low inlet pressure of high-temperature water indicates that the high-temperature water system is short of water or there is an abnormality in the pipeline. If the high-temperature water system is abnormal for too long, it will lead to poor cooling effect of high-temperature moving parts, and in severe cases, major mechanical failures such as cylinder explosion, cylinder scoring, and bearing shell crushing will occur. Therefore, it is necessary to strengthen the monitoring protection and fault diagnosis of the inlet pressure of high-temperature water and oil.

[0003] With the development of technologies such as sensor technology, big data technology, intelligent diagnosis, and embedded systems, the health diagnosis of diesel engine cooling systems is also developing towards the direction of intelligence and systematization.

[0004] Designing an intelligent diagnosis method for abnormal inlet pressure of high-temperature water according to the characteristics of the high-temperature water system of a locomotive diesel engine is one of the key technologies for preventing faults in the diesel engine cooling system, clarifying the cause of the fault, and improving the efficiency of maintenance and operation.

[0005] At present, most of the high-temperature water pressures of locomotive diesel engines only have basic signal acquisition and pressure threshold protection functions. Some diesel engine units and cooling systems are gradually starting to develop towards intelligent diagnosis, but there is no complete intelligent diagnosis function for high-temperature water pressure.

[0006] The current disadvantages of the high-temperature water pressure diagnosis technology for locomotive diesel engines are as follows:

[0007] 1) The setting of pressure protection values is single, lacking a comprehensive diagnosis of the cooling system. It is difficult to diagnose the cause of the fault after the pressure is abnormal. In most cases, only traditional manual experience can be relied on for cause analysis, and the timeliness is poor.

[0008] 2) Some diesel engine units and cooling systems have started to establish an intelligent fault diagnosis system, but most of them only describe the overall structure and function of the diagnosis system, and there is no specific diagnosis method targeted at this part, which is the core and difficulty of intelligent diagnosis. Summary of the Invention

[0009] To solve the above problems, the technical solution adopted by the present invention is: an intelligent diagnosis method for abnormal inlet pressure of high-temperature water in a locomotive diesel engine, comprising the following steps:

[0010] Obtain the numerical values of the inlet pressure of high-temperature water in the diesel engine, the outlet pressure of high-temperature water, the rotational speed of the diesel engine, and the inlet pressure signal of the intermediate cooling water;

[0011] When the diesel engine is operating at a certain rotational speed, the inlet pressure P of high-temperature water in the diesel engine in <the low threshold value ΔP of the inlet pressure of high-temperature water at this rotational speed Hin and after a certain period of time, it is determined that there is an abnormal pressure at the inlet of high-temperature water;

[0012] Based on the numerical values of the outlet pressure of high-temperature water and the inlet pressure signal of the intermediate cooling water; by comparing the numerical values of the outlet pressure of high-temperature water, the rotational speed of the diesel engine, and the inlet pressure signal of the intermediate cooling water with their respective threshold values in sequence, the cause of the fault leading to the abnormal inlet pressure of high-temperature water in the diesel engine is judged.

[0013] Further: the process of judging the cause of the fault leading to the abnormal inlet pressure of high-temperature water in the diesel engine by comparing the numerical values of the outlet pressure of high-temperature water, the rotational speed of the diesel engine, and the inlet pressure signal of the intermediate cooling water with their respective threshold values in sequence is as follows:

[0014] When the outlet pressure P of high-temperature water Hout <the set low pressure threshold value ΔP Hout , judge whether the inlet pressure P of the intermediate cooling water Lin exceeds the set low threshold value ΔP of the inlet pressure of the intermediate cooling water Lin ;

[0015] When the outlet pressure of high-temperature water ≥ the set low pressure threshold value ΔP Hout , then judge whether the inlet pressure P of the intermediate cooling water Lin exceeds the set low threshold value ΔP of the inlet pressure of the intermediate cooling water Lin .

[0016] Further: the process of judging whether the inlet pressure P of the intermediate cooling water Hout <the set low pressure threshold value ΔP Hout exceeds the set low threshold value ΔP of the inlet pressure of the intermediate cooling water when the outlet pressure P of high-temperature water Lin is as follows: Lin When the pressure of the intermediate cooling water ≥ the set low pressure threshold value ΔP

[0017] Lin , judge that the root cause of the fault is: abnormal high-temperature water pump or abnormal cooling water pipeline, and give operation and maintenance suggestions: observe during driving and check the high-temperature water pump, cooling water pipeline, and radiator during maintenance;

[0018] When the pressure of the intermediate cooling water < the set low pressure threshold ΔP of the pressure Lin , it is judged that the root cause of the fault is: abnormal locomotive water level or cooling water pipeline, and operation and maintenance suggestions are given: observe during driving, and check the locomotive water level, cooling water pipeline, high-temperature water pump, and low-temperature water pump in turn during maintenance.

[0019] Furthermore: when the high-temperature water outlet pressure ≥ the set low pressure threshold ΔP of the pressure Hout , then judge the pressure P of the intermediate cooling water inlet Lin Whether it exceeds the set low pressure threshold ΔP of the intermediate cooling water inlet pressure Lin The process is as follows:

[0020] When the pressure of the intermediate cooling water ≥ the set low pressure threshold ΔP of the pressure Lin , it is judged that the root cause of the fault is: abnormal high-temperature water inlet pressure signal or cooling water pipeline blockage, and operation and maintenance suggestions are given: observe during driving, and check the high-temperature water inlet pressure sensor and wiring harness, high-temperature water pump, and cooling water pipeline in turn during maintenance;

[0021] When the pressure of the intermediate cooling water < the set low pressure threshold ΔP of the pressure Lin , it is judged that the root cause of the fault is: abnormal locomotive water level or cooling water pipeline, and operation and maintenance suggestions are given: observe during driving, and check the cooling water pipeline, high-temperature water pump, low-temperature water pump, and the appearance of the diesel engine in turn during maintenance.

[0022] Furthermore: it also includes an alarm prompt for the situation of abnormal high-temperature water inlet pressure.

[0023] An intelligent diagnosis device for abnormal high-temperature water inlet pressure of a locomotive diesel engine, including:

[0024] Acquisition module: used to acquire the high-temperature water inlet pressure, high-temperature water outlet pressure, diesel engine speed, and intermediate cooling water inlet pressure signal values of the diesel engine;

[0025] Judgment module: used to judge that there is abnormal pressure at the high-temperature water inlet when the diesel engine is running at a certain speed, and the high-temperature water inlet pressure P of the diesel engine in < the low pressure threshold ΔP of the high-temperature water inlet pressure at this speed Hin And after a certain period of time, it is judged that there is abnormal pressure at the high-temperature water inlet;

[0026] Fault cause diagnosis module: used to judge the fault cause of the high-temperature water inlet pressure of the diesel engine by comparing the high-temperature water outlet pressure, diesel engine speed, and intermediate cooling water inlet pressure signal values with their respective thresholds in turn based on the high-temperature water outlet pressure and intermediate cooling water inlet pressure signal values;

[0027] Alarm module: used to give an alarm prompt for the situation of abnormal oil inlet pressure.

[0028] An intelligent diagnosis system for abnormal high-temperature water inlet pressure of a locomotive diesel engine, comprising:

[0029] A signal acquisition module for acquiring signals of the high-temperature water inlet pressure of the diesel engine, the high-temperature water outlet pressure, the diesel engine speed, and the medium-cooling water inlet pressure;

[0030] Based on the signals of the high-temperature water inlet pressure of the diesel engine, the high-temperature water outlet pressure, the diesel engine speed, and the medium-cooling water inlet pressure acquired by the signal acquisition module, an intelligent diagnosis device for abnormal high-temperature water inlet pressure of a locomotive diesel engine as described above is used to judge the fault causes of the abnormal high-temperature water inlet pressure of the locomotive diesel engine;

[0031] An on-vehicle operation and maintenance display terminal for displaying the fault causes, operation and maintenance suggestions, and early warning prompts of the intelligent diagnosis device.

[0032] An intelligent diagnosis method and device for abnormal high-temperature water inlet pressure of a locomotive diesel engine provided by the present invention, in combination with the characteristics of the locomotive diesel engine cooling system, constructs a specific and detailed intelligent diagnosis method for abnormal high-temperature water pressure of the diesel engine, realizes the intelligent diagnosis of abnormal high-temperature water pressure, clarifies the reasons for the abnormal pressure and fault location, provides targeted operation and maintenance suggestions, and displays them in the on-vehicle diagnosis system, thereby improving the efficiency of operation and maintenance and repair. Brief Description of the Drawings

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0034] Figure 1 It is a structural diagram of the locomotive diesel engine cooling system;

[0035] Figure 2 It is a flow chart of the intelligent diagnosis method for abnormal high-temperature water inlet pressure of the locomotive diesel engine;

[0036] Figure 3 It is a system diagram of the intelligent diagnosis of abnormal high-temperature water pressure of the locomotive diesel engine. Detailed Embodiments

[0037] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The following will refer to the drawings and combine the embodiments to describe the present invention in detail.

[0038] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part rather than all of the embodiments of the present invention. The description of at least one exemplary embodiment below is actually only illustrative and in no way limits the present invention and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0039] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments of the present invention. As used herein, unless otherwise clearly specified in the context, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations.

[0040] Unless otherwise specifically stated, the relative arrangements, numerical expressions and values of the components and steps set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationship. Technologies, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods and devices should be regarded as part of the authorized specification. In all the examples shown and discussed here, any specific values should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0041] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the scope of protection of the present invention. The orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0042] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "upper" etc. can be used here to describe the spatial positional relationship of a device or feature shown in the figure with other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations during use or operation in addition to the orientation described in the figure for the device. For example, if the device in the attached figure is inverted, a device described as "above or over other devices or structures" will then be positioned as "below or under other devices or structures". Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations are made for the spatial relative descriptions used here.

[0043] In addition, it should be noted that using words such as "first", "second" etc. to limit components is only for the convenience of differentiating the corresponding components. Without additional declaration, the above words have no special meaning, so it cannot be understood as a limitation on the protection scope of the present invention.

[0044] Figure 1 is the structural diagram of the locomotive diesel engine cooling system;

[0045] Figure 2 is the flowchart of the intelligent diagnosis method for abnormal high - temperature water inlet pressure of the locomotive diesel engine;

[0046] An intelligent diagnosis method for abnormal high - temperature water inlet pressure of a locomotive diesel engine includes the following steps:

[0047] S1: Obtain the numerical values of the high - temperature water inlet pressure, high - temperature water outlet pressure, diesel engine speed, and intermediate cooling water inlet pressure signal of the diesel engine;

[0048] S2: When the diesel engine is running at a certain speed, if the high - temperature water inlet pressure P of the diesel engine in <the low threshold value ΔP of the high - temperature water inlet pressure at this speed Hin and after lasting for a certain time, it is determined that there is abnormal pressure at the high - temperature water inlet;

[0049] The said certain time refers to the time when the actual pressure continuously remains lower than the low threshold value, usually referring to the delay time, which can be designed with different times according to the characteristics of different diesel engines, and the said certain time can be set to 60 seconds.

[0050] For the low threshold values of the high - temperature water inlet pressure at different diesel engine speeds, a curve design of diesel engine speed - low threshold value of high - temperature water inlet pressure can be carried out, such as Table 1, or adaptive design can be made according to the characteristics of different high - temperature water systems of diesel engines.

[0051] Table 1 Example table of low threshold curve for high-temperature water inlet pressure of diesel engine

[0052] Diesel engine speed (r / min) <![CDATA[Low threshold ΔP of high-temperature water inlet pressure Hin (kPa)]]> 100 50 325 150 550 200 750 250 900 320 1000 350

[0053] Low threshold ΔP of high-temperature water inlet pressure Hin It can be adjusted adaptively according to the cooling systems of different locomotive diesel engines.

[0054] S3: Based on the numerical values of the high-temperature water outlet pressure, the medium-cooling water inlet pressure signals; a method of comparing the numerical values of the high-temperature water outlet pressure, the diesel engine speed, and the medium-cooling water inlet pressure signals with their respective thresholds in sequence to judge the fault causes leading to the high-temperature water inlet pressure of the diesel engine;

[0055] S4: Alarm and prompt for abnormal high-temperature water inlet pressure situations.

[0056] Steps S1 / S2 / S3 / S4 are executed in sequence;

[0057] Furthermore: The process of judging the fault causes leading to the high-temperature water inlet pressure of the diesel engine by the method of comparing the numerical values of the high-temperature water outlet pressure, the diesel engine speed, and the medium-cooling water inlet pressure signals with their respective thresholds in sequence is as follows:

[0058] a. After the high-temperature water inlet pressure triggers an abnormal alarm, it transfers to detecting the high-temperature water outlet pressure P Hout Whether it is lower than the set low pressure threshold ΔP Hout Judge that the high-temperature water outlet pressure is the pressure of the high-temperature water at the outlet main pipe of the diesel engine after the internal circulation of the high-temperature water in the diesel engine is completed (see Figure 1 ).

[0059] a.1 When the high-temperature water outlet pressure < the set low pressure threshold ΔP Hout , then judge whether the medium-cooling water inlet pressure P Lin is lower than the set low threshold of the medium-cooling water inlet pressure ΔP Lin , Both the medium-cooling water and the high-temperature water are supplied with cooling water by the expansion tank. If the cooling system pipeline is seriously short of water, the pressures of both the high-temperature water and the medium-cooling water will be lower than the normal range;

[0060] a.1.1 When the medium-cooling water pressure > the set low pressure threshold ΔP Lin (The water pressure of the locomotive cooling water system pipeline is normal, but the high-temperature water system pipeline or the high-temperature water pump is abnormal), judge that the fault source is the abnormal high-temperature water pump or the abnormal cooling water pipeline, and give operation and maintenance suggestions: Observe during operation when driving, and check the high-temperature water pump, cooling water pipeline, and radiator during maintenance.

[0061] a.1.2 When the cold water pressure ≤ the set low pressure threshold ΔP Lin (There is a serious lack of water in the locomotive cooling water system pipeline), it is judged that the root cause of the failure is abnormal locomotive water level or cooling water pipeline, and operation and maintenance suggestions are given: Observe the operation during driving, and check the locomotive water level, cooling water pipeline, high-temperature water pump, and low-temperature water pump in turn during maintenance.

[0062] a.2 When the high-temperature water outlet pressure is higher than the set low pressure threshold ΔP Hout , then judge whether the medium cold water inlet pressure P Lin is lower than the set low threshold of medium cold water inlet pressure ΔP Lin (The high-temperature water outlet pressure is normal, indicating that the internal water circulation of the diesel engine is normal, and there is a blockage in the locomotive external system pipeline or abnormal sensor signal.)

[0063] a.2.1 When the medium cold water pressure ≥ the set low pressure threshold ΔP Lin (The water pressure of the locomotive cooling water system pipeline is normal, and the high-temperature water signal acquisition is abnormal or the water pipeline is blocked), it is judged that the root cause of the failure is: abnormal high-temperature water inlet pressure signal or cooling water pipeline blockage, and operation and maintenance suggestions are given: Observe the operation during driving, and check the high-temperature water inlet pressure sensor and wiring harness, high-temperature water pump, and cooling water pipeline in turn during maintenance.

[0064] a.2.2 When the medium cold water pressure < the set low pressure threshold ΔP Lin (There is a serious lack of water in the locomotive cooling water system pipeline), it is judged that the root cause of the failure is abnormal locomotive water level or cooling water pipeline, and operation and maintenance suggestions are given: Observe the operation during driving, and check the cooling water pipeline, high-temperature water pump, low-temperature water pump, and the appearance of the diesel engine in turn during maintenance.

[0065] This method first designs an abnormal alarm for the high-temperature water inlet pressure. The abnormal alarm is mainly for the low threshold of the high-temperature water inlet pressure at different diesel engine speeds. The curve of diesel engine speed - low threshold of high-temperature water inlet pressure can be designed, such as Table 1, or it can be adaptively designed according to the characteristics of different diesel engine high-temperature water systems.

[0066] An intelligent diagnosis device for abnormal high-temperature water inlet pressure of a locomotive diesel engine, including:

[0067] Acquisition module: used to acquire the numerical values of the high-temperature water inlet pressure, high-temperature water outlet pressure, diesel engine speed, and medium cold water inlet pressure signal of the diesel engine;

[0068] Judgment module: used to judge that there is abnormal pressure at the high-temperature water inlet when the diesel engine is running at a certain speed, the high-temperature water inlet pressure P of the diesel engine in <the low threshold of the high-temperature water inlet pressure ΔP at this speed Hin and after a certain period of time, judge that there is abnormal pressure at the high-temperature water inlet;

[0069] Fault cause diagnosis module: It is used to judge the fault cause of the high-temperature water inlet pressure of the diesel engine by comparing the numerical values of the high-temperature water outlet pressure and the medium-cooling water inlet pressure signals with their respective thresholds in sequence for the high-temperature water outlet pressure, diesel engine speed, and medium-cooling water inlet pressure signal numerical values;

[0070] Alarm module: It is used to give an alarm prompt for the abnormal oil inlet pressure situation.

[0071] Figure 3 It is a diagram of the intelligent diagnosis system for the abnormal high-temperature water pressure of the locomotive diesel engine.

[0072] An intelligent diagnosis system for the abnormal high-temperature water inlet pressure of a locomotive diesel engine, the system includes:

[0073] A signal acquisition module for acquiring signals of the high-temperature water inlet pressure, high-temperature water outlet pressure, diesel engine speed, and medium-cooling water inlet pressure of the diesel engine;

[0074] Build a data acquisition terminal for the locomotive diesel engine record to automatically collect relevant information. The data acquisition terminal includes sensors installed on the diesel engine and a signal acquisition module for signal conversion and transmission. To implement this method, the data collected by the signal acquisition module should include: information such as high-temperature water inlet pressure, diesel engine speed, high-temperature water outlet pressure, and medium-cooling water inlet pressure.

[0075] Based on the signals of the high-temperature water inlet pressure, high-temperature water outlet pressure, diesel engine speed, and medium-cooling water inlet pressure of the diesel engine collected by the signal acquisition module, use an intelligent diagnosis device for the abnormal high-temperature water inlet pressure of the locomotive diesel engine to judge the fault cause of the abnormal high-temperature water inlet pressure of the locomotive diesel engine;

[0076] This device can use a server software and hardware or other devices with a large-capacity data storage function and signal receiving, processing, and analyzing capabilities. For easy transplantation and expansion, the system can adopt a modular or distributed architecture, and the program modules between data communication, pressure abnormal alarm diagnosis method, and pressure abnormal intelligent diagnosis method can be independent of each other but can call each other.

[0077] An on-vehicle operation and maintenance display terminal for displaying the fault cause, operation and maintenance suggestions, and early warning prompts of the intelligent diagnosis device. The high-temperature water inlet pressure abnormal alarm transmits the fault root cause and operation and maintenance suggestions obtained through the above intelligent diagnosis process to the on-vehicle operation and maintenance display terminal for corresponding early warning prompts.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements 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 abnormal inlet pressure of high-temperature water in a locomotive diesel engine, characterized in that: It includes the following steps: Obtain the signal values of the inlet pressure of the high-temperature water of the diesel engine, the outlet pressure of the high-temperature water, the rotational speed of the diesel engine, and the inlet pressure of the intermediate cooling water; When the diesel engine is running at a certain speed, the inlet pressure P of the high-temperature water of the diesel engine in <is lower than the low threshold value ΔP of the inlet pressure of the high-temperature water at this speed Hin and after a certain period of time, it is determined that there is an abnormal pressure at the high-temperature water inlet; By the method of comparing the signal values of the outlet pressure of the high-temperature water and the inlet pressure of the intermediate cooling water with their respective thresholds in sequence, judge the fault causes that lead to the inlet pressure of the high-temperature water of the diesel engine; The process of judging the fault causes that lead to the inlet pressure of the high-temperature water of the diesel engine by the method of comparing the signal values of the outlet pressure of the high-temperature water and the inlet pressure of the intermediate cooling water with their respective thresholds in sequence is as follows: When the high-temperature water outlet pressure P Hout is less than the set low pressure threshold ΔP Hout , determine whether the medium-cooling water inlet pressure P Lin exceeds the set low medium-cooling water inlet pressure threshold ΔP Lin ; When the high-temperature water outlet pressure ≥ the set low pressure threshold ΔP Hout , then judge whether the medium-cooling water inlet pressure P Lin exceeds the set low threshold of the medium-cooling water inlet pressure ΔP Lin ; When the high-temperature water outlet pressure P Hout <is lower than the set low pressure threshold ΔP Hout , to determine whether the medium-cooling water inlet pressure P Lin exceeds the set low threshold ΔP Lin of the medium-cooling water inlet pressure, the process is as follows: When the cold water inlet pressure ≥ the set low pressure threshold ΔP Lin , it is determined that the root cause of the fault is: abnormal high-temperature water pump or abnormal cooling water pipeline, and the operation and maintenance suggestions are given: observe the operation during driving, and check the high-temperature water pump, cooling water pipeline, and radiator during maintenance; When the cold water inlet pressure < the set pressure low threshold ΔP Lin , it is determined that the root cause of the fault is: abnormal locomotive water level or cooling water pipeline, and operation and maintenance suggestions are given: observe the operation during driving, and check the locomotive water level, cooling water pipeline, high-temperature water pump, and low-temperature water pump in sequence during maintenance.

2. The intelligent diagnosis method for abnormal inlet pressure of high-temperature water in a locomotive diesel engine according to claim 1, characterized in that: When the high-temperature water outlet pressure ≥ the set low pressure threshold ΔP Hout , then it is judged whether the medium-cooling water inlet pressure P Lin exceeds the set low medium-cooling water inlet pressure threshold ΔP Lin The process is as follows: When the cold water inlet pressure ≥ the set low pressure threshold ΔP Lin , it is determined that the root cause of the fault is: abnormal high-temperature water inlet pressure signal or blocked cooling water pipeline, and operation and maintenance suggestions are given: observe the operation during driving, and successively check the high-temperature water inlet pressure sensor and wiring harness, high-temperature water pump, and cooling water pipeline during maintenance; When the cold water inlet pressure < the set pressure low threshold ΔP Lin , it is determined that the root cause of the fault is: abnormal locomotive water level or cooling water pipeline, and operation and maintenance suggestions are given: observe during driving, and check the cooling water pipeline, high-temperature water pump, low-temperature water pump, and the appearance of the diesel engine during maintenance.

3. The intelligent diagnosis method for abnormal inlet pressure of high-temperature water in a locomotive diesel engine according to claim 1, characterized in that: It also includes giving an alarm prompt for the situation of abnormal inlet pressure of the high-temperature water.

4. An intelligent diagnosis device for abnormal inlet pressure of high-temperature water in a locomotive diesel engine, characterized in that: It includes: An acquisition module: used to obtain the signal values of the inlet pressure of the high-temperature water of the diesel engine, the outlet pressure of the high-temperature water, the rotational speed of the diesel engine, and the inlet pressure of the intermediate cooling water; Judgment module: used to judge that there is an abnormal pressure at the high-temperature water inlet when the diesel engine is running at a certain speed and the high-temperature water inlet pressure P of the diesel engine in <is lower than the low threshold value ΔP of the high-temperature water inlet pressure at this speed Hin and after a certain period of time, it is judged that there is an abnormal pressure at the high-temperature water inlet; A fault cause diagnosis module: used to judge the fault causes that lead to the inlet pressure of the high-temperature water of the diesel engine by the method of comparing the signal values of the outlet pressure of the high-temperature water and the inlet pressure of the intermediate cooling water with their respective thresholds in sequence; The process of judging the fault causes that lead to the inlet pressure of the high-temperature water of the diesel engine by the method of comparing the signal values of the outlet pressure of the high-temperature water, the rotational speed of the diesel engine, and the inlet pressure of the intermediate cooling water with their respective thresholds in sequence is as follows: When the high-temperature water outlet pressure P Hout <is lower than the set low pressure threshold ΔP Hout , determine whether the medium-cooling water inlet pressure PLin exceeds the set low medium-cooling water inlet pressure threshold ΔP Lin ; When the high-temperature water outlet pressure ≥ the set low pressure threshold ΔP Hout , then determine whether the medium-cooling water inlet pressure PLin exceeds the set low medium-cooling water inlet pressure threshold ΔP Lin ; When the high-temperature water outlet pressure P Hout is lower than the set low pressure threshold ΔP Hout , the process of judging whether the medium-cooling water inlet pressure P Lin exceeds the set low threshold ΔP Lin of the medium-cooling water inlet pressure is as follows: When the inlet pressure of the intermediate cooling water ≥ the set low pressure threshold ΔP Lin , it is determined that the root cause of the fault is: abnormal high-temperature water pump or abnormal cooling water pipeline, and the operation and maintenance suggestions are given: observe the operation during driving, and check the high-temperature water pump, cooling water pipeline, and radiator during maintenance; When the inlet pressure of the intermediate cooling water < the set low pressure threshold ΔP Lin , it is determined that the root cause of the fault is: abnormal locomotive water level or cooling water pipeline, and the operation and maintenance suggestions are given: observe the operation during driving, and check the locomotive water level, cooling water pipeline, high-temperature water pump, and low-temperature water pump in sequence during maintenance; An alarm module: used to give an alarm prompt for the situation of abnormal inlet pressure of the engine oil.

5. An intelligent diagnosis system for abnormal inlet pressure of high-temperature water in a locomotive diesel engine, characterized in that: It includes: A signal acquisition module for collecting the signals of the inlet pressure of the high-temperature water of the diesel engine, the outlet pressure of the high-temperature water, the rotational speed of the diesel engine, and the inlet pressure of the intermediate cooling water; Based on the signals of the inlet pressure of the high-temperature water of the diesel engine, the outlet pressure of the high-temperature water, the rotational speed of the diesel engine, and the inlet pressure of the intermediate cooling water collected by the signal acquisition module, use an intelligent diagnosis device for abnormal inlet pressure of the high-temperature water of a locomotive diesel engine as described in claim 4 to judge the fault causes that lead to the abnormal inlet pressure of the high-temperature water of the locomotive diesel engine; An on-vehicle operation and maintenance display terminal for displaying the fault causes, operation and maintenance suggestions, and early warning prompts of the intelligent diagnosis device.

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