A piston cooling nozzle assembly condition detection method, device and equipment

Abstract

The application discloses a piston cooling nozzle assembly state detection method, device and equipment, and the method comprises the following steps: acquiring a real-time main oil passage pressure; acquiring a real-time engine oil pressure after a piston cooling nozzle assembly slide valve; calculating a difference value between the real-time main oil passage pressure and the real-time engine oil pressure after the piston cooling nozzle assembly slide valve to obtain a real-time pressure difference value; inquiring an allowed pressure difference value range corresponding to a current engine working condition according to the current engine working condition; the allowed pressure difference value range corresponding to different engine working conditions is pre-established; if the real-time pressure difference value is not within the allowed pressure difference value range, it is determined that the piston cooling nozzle assembly state is abnormal, and if the real-time pressure difference value is within the allowed pressure difference value range, it is determined that the piston cooling nozzle assembly state is normal. Thus, the piston cooling nozzle assembly state detection is realized.

Description

Technical Field

[0001] This application relates to the field of engine technology, specifically to a method, apparatus, and equipment for detecting the condition of a piston cooling nozzle assembly. Background Technology

[0002] As a key component of an engine, the piston operates under harsh conditions, bearing high mechanical and thermal loads. High thermal load is one of the main causes of piston failure. Currently, a widely adopted method to reduce piston thermal load is oil injection cooling, which involves using a piston cooling nozzle assembly to directly inject cooling oil into the oscillating oil chamber on the piston bottom, thereby carrying away the piston's heat. Some diesel engines, in order to improve the lubrication pressure of the friction pairs and the overall engine thermal efficiency under low-speed conditions, employ piston cooling nozzle assemblies with pressure-controlled spool valves.

[0003] The proper functioning of the piston cooling nozzle assembly, which performs oil injection cooling, directly affects the piston's cooling effect. However, current technology does not allow for the detection of whether the piston cooling nozzle assembly is functioning correctly. Summary of the Invention

[0004] In view of this, embodiments of this application provide a method, apparatus, and device for detecting the state of a piston cooling nozzle assembly, so as to detect whether the piston cooling nozzle assembly is working properly.

[0005] To address the above problems, the technical solutions provided in this application are as follows:

[0006] A method for detecting the condition of a piston cooling nozzle assembly, the method comprising:

[0007] Obtain real-time main oil passage pressure;

[0008] Obtain the real-time oil pressure after the piston cooling nozzle assembly slide valve;

[0009] Calculate the difference between the real-time main oil passage pressure and the real-time oil pressure after the piston cooling nozzle assembly slide valve to obtain the real-time pressure difference.

[0010] The query retrieves the allowable pressure difference range corresponding to the current engine operating condition; the allowable pressure difference ranges for different engine operating conditions are pre-established.

[0011] If the real-time pressure difference is not within the allowable pressure difference range, the piston cooling nozzle assembly is determined to be in an abnormal state; if the real-time pressure difference is within the allowable pressure difference range, the piston cooling nozzle assembly is determined to be in a normal state.

[0012] In one possible implementation, the process of establishing the allowable pressure difference range corresponding to different engine operating conditions includes:

[0013] The pressure difference between the main oil passage pressure and the oil pressure after the slide valve of the piston cooling nozzle assembly was obtained through bench testing under different engine operating conditions and when the piston cooling nozzle assembly was working normally.

[0014] The allowable pressure difference range for different engine operating conditions is determined based on the pressure difference under different engine operating conditions.

[0015] In one possible implementation, obtaining the real-time main oil passage pressure includes:

[0016] The real-time pressure of the main oil passage is obtained through the main oil passage pressure sensor.

[0017] In one possible implementation, obtaining the real-time oil pressure after the piston cooling nozzle assembly slide valve includes:

[0018] The real-time oil pressure after the slide valve of the piston cooling nozzle assembly is obtained by a pressure sensor after the slide valve is opened. The pressure sensor after the slide valve is installed on the piston cooling nozzle assembly and is used to measure the oil pressure in the oil circuit of the piston cooling nozzle assembly after the slide valve of the piston cooling nozzle assembly is opened.

[0019] In one possible implementation, querying the allowable pressure difference range corresponding to the current engine operating condition based on the current engine operating condition includes:

[0020] Obtain the current engine operating status;

[0021] Based on the current engine operating condition, query the allowable pressure difference range corresponding to the current engine operating condition.

[0022] In one possible implementation, the engine operating conditions include engine speed and engine load.

[0023] In one possible implementation, after determining that the piston cooling nozzle assembly is in a normal state, the method further includes:

[0024] Repeat the steps described above for obtaining the real-time main oil passage pressure and subsequent steps.

[0025] A piston cooling nozzle assembly condition detection device, the device comprising:

[0026] The first acquisition unit is used to acquire the real-time main oil passage pressure;

[0027] The second acquisition unit is used to acquire the real-time oil pressure after the slide valve of the piston cooling nozzle assembly;

[0028] The calculation unit is used to calculate the difference between the real-time main oil passage pressure and the real-time oil pressure after the piston cooling nozzle assembly slide valve, and obtain the real-time pressure difference.

[0029] The query unit is used to query the allowable pressure difference range corresponding to the current engine operating condition based on the current engine operating condition; the allowable pressure difference range corresponding to different engine operating conditions is pre-established;

[0030] The determining unit is configured to determine that the piston cooling nozzle assembly is in an abnormal state if the real-time pressure difference is not within the allowable pressure difference range, and to determine that the piston cooling nozzle assembly is in a normal state if the real-time pressure difference is within the allowable pressure difference range.

[0031] A piston cooling nozzle assembly condition detection device, the device comprising:

[0032] One or more processors;

[0033] Storage device, on which one or more programs are stored,

[0034] When the one or more programs are executed by the one or more processors, the one or more processors implement the piston cooling nozzle assembly state detection method as described above.

[0035] A computer-readable medium having a computer program stored thereon, wherein the program, when executed by a processor, implements the piston cooling nozzle assembly state detection method as described above.

[0036] Therefore, the embodiments of this application have the following beneficial effects:

[0037] This embodiment of the application obtains the real-time main oil passage pressure and the real-time oil pressure after the piston cooling nozzle assembly slide valve, calculates the difference between the two to obtain the real-time pressure difference value, and queries the allowable pressure difference range corresponding to the current engine operating condition. If the real-time pressure difference value is within the allowable pressure difference range, the piston cooling nozzle assembly is determined to be in normal condition. If the real-time pressure difference value is not within the allowable pressure difference range, the piston cooling nozzle assembly is determined to be in abnormal condition. This achieves the detection of the piston cooling nozzle assembly's condition. Therefore, it can promptly detect abnormalities in the piston cooling nozzle assembly and take corresponding measures to avoid major malfunctions caused by insufficient piston cooling. Attached Figure Description

[0038] Figure 1 A schematic diagram of the hardware structure for implementing the piston cooling nozzle assembly state detection method provided in an embodiment of this application;

[0039] Figure 2A flowchart illustrating a piston cooling nozzle assembly state detection method provided in this application embodiment;

[0040] Figure 3 A flowchart illustrating another piston cooling nozzle assembly state detection method provided in this application embodiment;

[0041] Figure 4 This is a schematic diagram of a piston cooling nozzle assembly status detection device provided in an embodiment of this application. Detailed Implementation

[0042] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the embodiments of this application will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0043] To facilitate understanding and explanation of the technical solutions provided in the embodiments of this application, the background technology of the embodiments of this application will be described first below.

[0044] As a key component of an engine, the piston operates under harsh conditions, bearing high mechanical and thermal loads. High thermal load is one of the main causes of piston failure. Specifically, the piston withstands the pressure of combustion gases and transmits this force to the connecting rod via the piston pin, thereby driving the crankshaft to rotate.

[0045] The most common method to reduce piston thermal load is through oil injection cooling. This involves using a piston cooling nozzle assembly to directly inject cooling oil into the oscillating oil chamber on the piston bottom, carrying away the heat generated during engine combustion at the piston head. Some diesel engines, in order to improve the lubrication pressure of the friction pairs and the overall engine thermal efficiency under low-speed conditions, employ piston cooling nozzle assemblies with pressure-controlled spool valves.

[0046] The proper functioning of the piston cooling nozzle assembly, which performs oil injection cooling, directly affects the piston's cooling effect. The most common failure mode of the piston cooling nozzle assembly is the entry of small, hard particles into the spool valve, causing it to jam and thus preventing it from performing its intended cooling function. However, current technology lacks the means to detect whether the piston cooling nozzle assembly is functioning correctly.

[0047] The inventors discovered that an abnormality in the piston cooling nozzle assembly can lead to abnormal oil pressure downstream of the piston cooling nozzle assembly's slide valve. Based on this, this application provides a method, apparatus, and device for detecting the condition of a piston cooling nozzle assembly. An oil pressure measuring point is added downstream of the slide valve of the piston cooling nozzle assembly to monitor the main oil passage pressure and the oil pressure downstream of the slide valve in real time, calculating the difference between the two to obtain a real-time pressure difference value. This value is then compared with the allowable pressure difference range under normal engine operating conditions (e.g., speed and load) obtained from bench tests. This allows for a quick determination of whether the current piston cooling nozzle assembly is functioning correctly and whether further shutdown for inspection or replacement is necessary. Specifically, if the real-time pressure difference is within the allowable range, the piston cooling nozzle assembly is considered to be functioning normally. If the real-time pressure difference is outside the allowable range, the piston cooling nozzle assembly is considered to be malfunctioning. This achieves the detection of the piston cooling nozzle assembly's condition. Therefore, it is possible to detect abnormalities in the piston cooling nozzle assembly in a timely manner and take appropriate action, avoiding major malfunctions caused by insufficient piston cooling.

[0048] To facilitate understanding of the embodiments of this application, the following description, in conjunction with the accompanying drawings, illustrates a method for detecting the state of a piston cooling nozzle assembly provided by the embodiments of this application.

[0049] See Figure 1 As shown, the relevant hardware structure of the piston cooling nozzle assembly is first described. Here, 1 represents the engine block, 8 is the main oil passage, 6 is the main oil passage pressure sensor located in the main oil passage (the main oil passage pressure sensor 6 is used to detect the main oil passage pressure), and 5 is a sealing gasket that provides a seal. The oil passage within the piston cooling nozzle assembly 2 is connected to the main oil passage 8, and 7 is the slide valve within the piston cooling nozzle assembly 2. When the engine speed is low, the main oil passage pressure acting on the slide valve 7 is low, and the spring above the slide valve 7 generates a reaction force acting on the slide valve 7, preventing the slide valve 7 from moving to the open oil passage position. When the engine speed increases, the main oil passage pressure increases, acting on the slide valve 7, causing the slide valve 7 to move upward to the open oil passage state. Then, the engine oil in the main oil passage is sprayed out through the nozzles in the piston cooling nozzle assembly 2, achieving piston cooling.

[0050] In order to realize the piston cooling nozzle assembly status detection method provided in this application embodiment, a slide valve post-pressure sensor 4 is provided on the piston cooling nozzle assembly 2. The slide valve post-pressure sensor 4 is used to measure the oil pressure in the oil circuit inside the piston cooling nozzle assembly 2 after the slide valve 7 of the piston cooling nozzle assembly 2 is opened. 3 is a sealing gasket that plays a sealing role.

[0051] Based on the above hardware structure, a piston cooling nozzle assembly state detection method provided in this application embodiment can be implemented. Those skilled in the art will understand that... Figure 1 The hardware structure diagram shown is merely one example in which the embodiments of this application can be implemented. The scope of application of the embodiments of this application is not limited by any aspect of this framework.

[0052] See Figure 2 As shown, this figure is a flowchart of a piston cooling nozzle assembly state detection method provided in an embodiment of this application, which can be applied to an engine controller. Figure 2 As shown, the method may include S201-S205:

[0053] S201: Obtain real-time main oil passage pressure.

[0054] This application embodiment implements piston cooling nozzle assembly status detection, which requires acquiring the oil pressure in the oil circuit before the slide valve of the piston cooling nozzle assembly and the oil pressure in the oil circuit after the slide valve of the piston cooling nozzle assembly when the piston cooling nozzle assembly is working. The main oil passage pressure can be considered as the oil pressure in the oil circuit before the slide valve of the piston cooling nozzle assembly. Therefore, the current real-time main oil passage pressure can be acquired for subsequent detection steps.

[0055] In one possible implementation, the specific implementation of S201 obtaining the real-time main oil passage pressure may include: obtaining the real-time main oil passage pressure through a main oil passage pressure sensor. The main oil passage pressure sensor is located in the engine's main oil passage and is used to detect the main oil passage pressure. Since the main oil passage pressure sensor detects the main oil passage pressure in real time, the engine controller can obtain the real-time main oil passage pressure through the main oil passage pressure sensor.

[0056] S202: Obtain the real-time oil pressure after the piston cooling nozzle assembly slide valve.

[0057] The real-time oil pressure after the piston cooling nozzle assembly slide valve is the real-time oil pressure within the oil passage of the piston cooling nozzle assembly after passing through the piston cooling nozzle assembly slide valve. If the piston cooling nozzle assembly slide valve is not open in the piston cooling nozzle assembly's oil passage, the real-time oil pressure after the piston cooling nozzle assembly slide valve is zero.

[0058] In one possible implementation, a pressure sensor after the spool valve is installed on the piston cooling nozzle assembly to measure the oil pressure in the oil circuit within the piston cooling nozzle assembly after the spool valve is opened. Therefore, the specific implementation of S202, which obtains the real-time oil pressure after the spool valve of the piston cooling nozzle assembly, can include: obtaining the real-time oil pressure after the spool valve of the piston cooling nozzle assembly through the pressure sensor after the spool valve. By measuring the oil pressure in the oil circuit within the piston cooling nozzle assembly in real time using the pressure sensor after the spool valve, the engine controller can obtain the real-time oil pressure after the spool valve of the piston cooling nozzle assembly through the pressure sensor after the spool valve.

[0059] S203: Calculate the difference between the real-time main oil passage pressure and the real-time oil pressure after the piston cooling nozzle assembly slide valve to obtain the real-time pressure difference.

[0060] The difference between the real-time main oil passage pressure and the real-time oil pressure after the piston cooling nozzle assembly slide valve can be understood as the oil pressure difference before and after the piston cooling nozzle assembly slide valve, and this difference is taken as the real-time pressure difference.

[0061] S204: Query the allowable pressure difference range corresponding to the current engine operating condition based on the current engine operating condition; the allowable pressure difference range corresponding to different engine operating conditions is pre-established.

[0062] Before implementing the piston cooling nozzle assembly status detection method in this application embodiment, the allowable pressure difference range corresponding to different engine operating conditions can be pre-established. The specific establishment process includes:

[0063] The pressure difference between the main oil passage pressure and the oil pressure after the slide valve of the piston cooling nozzle assembly was obtained through bench testing under different engine operating conditions and when the piston cooling nozzle assembly was working normally.

[0064] The allowable pressure difference range for different engine operating conditions is determined based on the pressure difference under different engine operating conditions.

[0065] In practical applications, during bench tests, by adjusting different engine operating conditions while ensuring the piston cooling nozzle assembly functions normally, the main oil passage pressure is obtained by the main oil passage pressure sensor, and the oil pressure after the piston cooling nozzle assembly slide valve is obtained by the pressure sensor after the slide valve. This allows us to obtain the pressure difference between the main oil passage pressure and the oil pressure after the piston cooling nozzle assembly slide valve under different engine operating conditions. To avoid misjudgment, we can determine the allowable pressure difference range corresponding to the pressure difference under different engine operating conditions, thus establishing the allowable pressure difference range for different engine operating conditions. For example, under engine operating condition a, we calculate the pressure difference Pa between the main oil passage pressure and the oil pressure after the piston cooling nozzle assembly slide valve, and set the corresponding allowable pressure difference range [Pamin, Pamax] for this pressure difference. Pamin is less than Pa, and Pamax is greater than Pa; therefore, the allowable pressure difference range for engine operating condition a is [Pamin, Pamax]. Similarly, we establish the allowable pressure difference range for different engine operating conditions. This allowable pressure difference range characterizes the allowable pressure difference range when the piston cooling nozzle assembly is functioning normally.

[0066] During the detection process in this application embodiment, the allowable pressure difference range corresponding to the current engine operating condition is queried according to the current engine operating condition, and then the real-time pressure difference is compared with the allowable pressure difference range corresponding to the current engine operating condition to determine whether the piston cooling nozzle assembly is in normal condition.

[0067] In one possible implementation, S204, which queries the allowable pressure difference range corresponding to the current engine operating condition, may include: obtaining the current engine operating condition; and querying the allowable pressure difference range corresponding to the current engine operating condition. The engine operating condition may include engine speed and engine load.

[0068] Obtain the current engine speed and engine load, and query the allowable pressure difference range corresponding to the current engine speed and engine load to detect the status of the piston cooling nozzle assembly.

[0069] It is understood that the execution order between S201-S203 and S204 is not limited in the embodiments of this application. For example, S201-S203 and S204 can be executed in parallel, or S201-S203 can be executed first and then S204 can be executed, or S204 can be executed first and then S201-S203 can be executed.

[0070] S205: If the real-time pressure difference is not within the allowable pressure difference range, the piston cooling nozzle assembly is determined to be in an abnormal state; if the real-time pressure difference is within the allowable pressure difference range, the piston cooling nozzle assembly is determined to be in a normal state.

[0071] If the real-time pressure difference is outside the allowable range, it indicates an abnormality in the piston cooling nozzle assembly. In practical applications, an early warning message can be generated indicating an abnormality in the piston cooling nozzle assembly, prompting the system to stop and inspect the assembly for any abnormalities. If the real-time pressure difference is within the allowable range, the piston cooling nozzle assembly is considered to be functioning normally.

[0072] In one possible implementation, after confirming that the piston cooling nozzle assembly is in normal condition, the process can return to S201 and repeat the steps of obtaining the real-time main oil passage pressure and subsequent steps. This allows for continuous real-time monitoring of the piston cooling nozzle assembly's condition during engine operation.

[0073] Based on S201-S205 above, this embodiment of the application obtains the real-time main oil passage pressure and the real-time oil pressure after the piston cooling nozzle assembly slide valve, calculates the difference between the two to obtain the real-time pressure difference value, and queries the allowable pressure difference range corresponding to the current engine operating condition. If the real-time pressure difference value is within the allowable pressure difference range, the piston cooling nozzle assembly is determined to be in normal condition. If the real-time pressure difference value is not within the allowable pressure difference range, the piston cooling nozzle assembly is determined to be in abnormal condition. This achieves the detection of the piston cooling nozzle assembly's condition. Therefore, it can promptly detect abnormalities in the piston cooling nozzle assembly and take corresponding measures to avoid major malfunctions caused by insufficient piston cooling.

[0074] See Figure 3 As shown, a piston cooling nozzle assembly state detection method provided in this application embodiment will be described in conjunction with a practical application scenario. For example... Figure 3 As shown, the piston cooling nozzle assembly state detection method provided in this application embodiment may include S300-S309:

[0075] S300: Establish the allowable pressure difference range for different engine operating conditions.

[0076] S301: Start executing the piston cooling nozzle assembly status detection method.

[0077] S302: Obtain engine speed.

[0078] S303: Obtain engine load.

[0079] S304: Obtain the real-time main oil passage pressure P1.

[0080] S305: Obtain the real-time oil pressure P2 after the piston cooling nozzle assembly slide valve.

[0081] S306: Calculate the difference between the real-time main oil passage pressure and the real-time oil pressure after the piston cooling nozzle assembly slide valve, and obtain the real-time pressure difference P0 = P1 - P2.

[0082] S307: Determine whether the real-time pressure difference P0 is within the allowable pressure difference range corresponding to the current engine operating condition. If yes, proceed to S308; otherwise, proceed to S309.

[0083] S308: Confirm that the piston cooling nozzle assembly is in normal condition, return to S301.

[0084] S309: The piston cooling nozzle assembly is found to be in an abnormal condition.

[0085] If the piston cooling nozzle assembly is found to be in abnormal condition, the machine needs to be stopped and the piston cooling nozzle assembly disassembled and inspected.

[0086] This application's embodiment adds an oil pressure measuring point after the slide valve of the piston cooling nozzle assembly. Real-time main oil passage pressure and real-time oil pressure after the slide valve are monitored under different speeds and loads. This pressure is compared with the allowable pressure difference range before and after the slide valve under normal operating conditions (speed and load) obtained from bench testing. This allows for rapid determination of whether the piston cooling nozzle assembly is functioning correctly and whether further shutdown for inspection or replacement is necessary. It also provides timely warnings and appropriate handling when abnormal conditions occur in the piston cooling nozzle assembly, preventing major malfunctions caused by insufficient piston cooling.

[0087] Based on the piston cooling nozzle assembly status detection method provided in the above method embodiments, this application also provides a piston cooling nozzle assembly status detection device, which will be described below with reference to the accompanying drawings.

[0088] See Figure 4 As shown in the figure, this is a structural schematic diagram of a piston cooling nozzle assembly status detection device provided in an embodiment of this application. Figure 4 As shown, the piston cooling nozzle assembly status detection device includes:

[0089] The first acquisition unit 401 is used to acquire the real-time main oil passage pressure;

[0090] The second acquisition unit 402 is used to acquire the real-time oil pressure after the slide valve of the piston cooling nozzle assembly;

[0091] The calculation unit 403 is used to calculate the difference between the real-time main oil passage pressure and the real-time oil pressure after the piston cooling nozzle assembly slide valve, and obtain the real-time pressure difference.

[0092] The query unit 404 is used to query the allowable pressure difference range corresponding to the current engine operating condition based on the current engine operating condition; the allowable pressure difference range corresponding to different engine operating conditions is pre-established;

[0093] The determining unit 405 is configured to determine that the piston cooling nozzle assembly is in an abnormal state if the real-time pressure difference is not within the allowable pressure difference range, and to determine that the piston cooling nozzle assembly is in a normal state if the real-time pressure difference is within the allowable pressure difference range.

[0094] In one possible implementation, the process of establishing the allowable pressure difference range corresponding to different engine operating conditions includes:

[0095] The pressure difference between the main oil passage pressure and the oil pressure after the slide valve of the piston cooling nozzle assembly was obtained through bench testing under different engine operating conditions and when the piston cooling nozzle assembly was working normally.

[0096] The allowable pressure difference range for different engine operating conditions is determined based on the pressure difference under different engine operating conditions.

[0097] In one possible implementation, the first acquisition unit is specifically used for:

[0098] The real-time pressure of the main oil passage is obtained through the main oil passage pressure sensor.

[0099] In one possible implementation, the second acquisition unit is specifically used for:

[0100] The real-time oil pressure after the slide valve of the piston cooling nozzle assembly is obtained by a pressure sensor after the slide valve is opened. The pressure sensor after the slide valve is installed on the piston cooling nozzle assembly and is used to measure the oil pressure in the oil circuit of the piston cooling nozzle assembly after the slide valve of the piston cooling nozzle assembly is opened.

[0101] In one possible implementation, the query unit is specifically used for:

[0102] Obtain the current engine operating status;

[0103] Based on the current engine operating condition, query the allowable pressure difference range corresponding to the current engine operating condition.

[0104] In one possible implementation, the engine operating conditions include engine speed and engine load.

[0105] In one possible implementation, the device further includes:

[0106] An execution unit is configured to, after the determining unit determines that the piston cooling nozzle assembly is in a normal state, return to the steps of executing the first acquisition unit, the second acquisition unit, the calculation unit, the query unit, and the determining unit.

[0107] Based on the piston cooling nozzle assembly condition detection method provided in the above-described method embodiments, this application embodiment also provides a piston cooling nozzle assembly condition detection device, the device comprising:

[0108] One or more processors;

[0109] Storage device, on which one or more programs are stored,

[0110] When the one or more programs are executed by the one or more processors, the one or more processors implement the piston cooling nozzle assembly state detection method described above.

[0111] In addition, embodiments of this application also provide a computer-readable medium having a computer program stored thereon, wherein the program, when executed by a processor, implements the above-described piston cooling nozzle assembly state detection method.

[0112] This embodiment of the application obtains the real-time main oil passage pressure and the real-time oil pressure after the piston cooling nozzle assembly slide valve, calculates the difference between the two to obtain the real-time pressure difference value, and queries the allowable pressure difference range corresponding to the current engine operating condition. If the real-time pressure difference value is within the allowable pressure difference range, the piston cooling nozzle assembly is determined to be in normal condition. If the real-time pressure difference value is not within the allowable pressure difference range, the piston cooling nozzle assembly is determined to be in abnormal condition. This achieves the detection of the piston cooling nozzle assembly's condition. Therefore, it can promptly detect abnormalities in the piston cooling nozzle assembly and take corresponding measures to avoid major malfunctions caused by insufficient piston cooling.

[0113] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the systems or apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple, and relevant parts can be referred to the method section.

[0114] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0115] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0116] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented directly by hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0117] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for detecting the condition of a piston cooling nozzle assembly, characterized in that, The method includes: Obtain real-time main oil passage pressure; Obtain the real-time oil pressure after the piston cooling nozzle assembly slide valve; Calculate the difference between the real-time main oil passage pressure and the real-time oil pressure after the piston cooling nozzle assembly slide valve to obtain the real-time pressure difference. Obtain the current engine operating conditions, including engine speed and engine load; The allowable pressure difference range corresponding to the current engine operating condition is queried according to the current engine operating condition; the allowable pressure difference range corresponding to different engine operating conditions is pre-established, and the allowable pressure difference range corresponding to different engine operating conditions represents the pressure difference range when the piston cooling nozzle assembly is in normal condition under that engine operating condition. If the real-time pressure difference is not within the allowable pressure difference range, the piston cooling nozzle assembly is determined to be in an abnormal state; if the real-time pressure difference is within the allowable pressure difference range, the piston cooling nozzle assembly is determined to be in a normal state. The step of obtaining the real-time oil pressure after the slide valve of the piston cooling nozzle assembly includes: obtaining the real-time oil pressure after the slide valve of the piston cooling nozzle assembly through a pressure sensor after the slide valve. The pressure sensor after the slide valve is installed on the piston cooling nozzle assembly and is used to measure the oil pressure in the oil circuit of the piston cooling nozzle assembly after the slide valve of the piston cooling nozzle assembly is opened.

2. The method according to claim 1, characterized in that, The process of establishing the allowable pressure difference range corresponding to different engine operating conditions includes: The pressure difference between the main oil passage pressure and the oil pressure after the slide valve of the piston cooling nozzle assembly was obtained through bench testing under different engine operating conditions and when the piston cooling nozzle assembly was working normally. The allowable pressure difference range for different engine operating conditions is determined based on the pressure difference under different engine operating conditions.

3. The method according to claim 1, characterized in that, The acquisition of real-time main oil passage pressure includes: The real-time pressure of the main oil passage is obtained through the main oil passage pressure sensor.

4. The method according to any one of claims 1-3, characterized in that, After confirming that the piston cooling nozzle assembly is in normal condition, the method further includes: Repeat the steps described above for obtaining the real-time main oil passage pressure and subsequent steps.

5. A piston cooling nozzle assembly status detection device, characterized in that, The device includes: The first acquisition unit is used to acquire the real-time main oil passage pressure; The second acquisition unit is used to acquire the real-time oil pressure after the slide valve of the piston cooling nozzle assembly; The calculation unit is used to calculate the difference between the real-time main oil passage pressure and the real-time oil pressure after the piston cooling nozzle assembly slide valve, and obtain the real-time pressure difference. The third acquisition unit is used to acquire the current engine operating conditions, including engine speed and engine load. The query unit is used to query the allowable pressure difference range corresponding to the current engine operating condition based on the current engine operating condition. The allowable pressure difference range corresponding to different engine operating conditions is pre-established, and the allowable pressure difference range corresponding to different engine operating conditions represents the pressure difference range when the piston cooling nozzle assembly is in normal condition under that engine operating condition. The determining unit is configured to determine that the piston cooling nozzle assembly is in an abnormal state if the real-time pressure difference is not within the allowable pressure difference range, and to determine that the piston cooling nozzle assembly is in a normal state if the real-time pressure difference is within the allowable pressure difference range. The second acquisition unit is specifically used to: acquire the real-time oil pressure after the slide valve of the piston cooling nozzle assembly through the slide valve pressure sensor. The slide valve pressure sensor is installed on the piston cooling nozzle assembly and is used to measure the oil pressure in the oil circuit of the piston cooling nozzle assembly after the slide valve of the piston cooling nozzle assembly is opened.

6. A piston cooling nozzle assembly condition detection device, characterized in that, The device includes: One or more processors; Storage device, on which one or more programs are stored, When the one or more programs are executed by the one or more processors, the one or more processors implement the piston cooling nozzle assembly state detection method as described in any one of claims 1-4.

7. A computer-readable medium, characterized in that, It stores a computer program, wherein when the program is executed by a processor, it implements the piston cooling nozzle assembly state detection method as described in any one of claims 1-4.

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