Testing system for monitoring temperature of piston ring of marine engine

Abstract

The invention relates to a test system for monitoring the temperature of a piston ring of a marine engine, which belongs to the technical field of marine engine temperature monitoring and comprises an infrared temperature measurement module arranged in a cylinder sleeve test hole, a data acquisition unit electrically connected with the infrared temperature measurement module and a data processing unit electrically connected with the data acquisition unit. The number of the cylinder sleeve test holes is multiple, the infrared temperature measurement module is used for measuring the temperature of different positions of the piston ring, measured temperature data are collected through the data collection unit and subjected to primary processing, and the data processing unit receives the data transmitted by the data collection unit and then conducts deep analysis and processing so as to obtain the temperature distribution condition of the piston ring. Real-time and accurate monitoring of the temperature of the piston ring in the operation process of the engine is facilitated, the limitation of a traditional contact type measuring method is overcome, and the damage risk of the piston ring and a cylinder sleeve is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of marine engine temperature monitoring, and in particular relates to a test system for marine engine piston ring temperature monitoring. Background Art

[0002] In marine engines, piston rings primarily serve to seal and dissipate heat between the piston and cylinder. During engine operation, however, piston rings are exposed to high-temperature, high-pressure combustion gases, which can degrade mechanical properties such as elasticity and fatigue strength. High temperatures also degrade lubrication between the piston ring and cylinder liner, leading to severe friction and wear, potentially damaging both. Therefore, real-time monitoring of piston ring temperature during engine operation is crucial for assessing piston ring operating conditions and reducing the likelihood of damage.

[0003] Currently, piston ring temperature measurement primarily relies on contact methods, with the Temperature-Sensitive Paint (TSP) method (or hardness calibration method) being a traditional approach. This method measures the hardness decay of a pre-embedded TSP in a high-temperature environment and infers the maximum temperature experienced. However, this method has the following technical drawbacks:

[0004] 1) Destructive measurement: The engine must be disassembled to remove the durometer plug, which prevents real-time monitoring and is only suitable for laboratory calibration or post-analysis. The durometer plug must be replaced after each measurement, which is costly and complex.

[0005] 2) Time-temperature cumulative effect: Hardness changes are affected by both temperature and time, and the duration of heat exposure must be precisely controlled, otherwise significant errors (more than ±10°C) will be introduced. Transient temperature fluctuations (such as detonation and rapid acceleration) cannot be captured.

[0006] 3) Material limitations: Traditional hardness plugs (such as AISI 52100 steel) undergo phase transformation at temperatures above 600°C, causing the hardness-temperature relationship to fail. At high temperatures, diffusion or oxidation may occur at the weld interface between the hardness plug and the piston ring, affecting measurement reliability.

[0007] 4) Unable to calibrate dynamically: The hardness plug temperature measurement relies on a pre-calibrated curve. If the engine operating conditions exceed the calibration range (such as ultra-high temperature or ultra-low temperature), the data will be unreliable.

[0008] Considering that during engine operation, the working environment of the piston ring in the combustion chamber is harsh and it keeps reciprocating, the installation and signal acquisition conditions of the temperature sensor are greatly restricted, and the above problems exist in the hardness plug method. Summary of the Invention

[0009] The purpose of the present invention is to provide a marine engine piston ring temperature monitoring system using non-contact infrared temperature measurement technology to achieve real-time and accurate monitoring of the piston ring temperature during engine operation, thereby overcoming the limitations of traditional contact measurement methods, reducing the risk of damage to the piston ring and cylinder liner, and improving the safety and reliability of engine operation.

[0010] In order to achieve the above-mentioned purpose, the technical solution of the present invention provides a test system for monitoring the temperature of marine engine piston rings, comprising an infrared temperature measurement module arranged in a cylinder liner test hole, a data acquisition unit electrically connected to the infrared temperature measurement module, and a data processing unit electrically connected to the data acquisition unit. The cylinder liner test holes are provided in plurality, the infrared temperature measurement module is used to measure the temperature at different positions of the piston ring, the measured temperature data is collected and preliminarily processed by the data acquisition unit, and the data processing unit receives the data transmitted by the data acquisition unit and performs in-depth analysis and processing to obtain the temperature distribution of the piston ring.

[0011] Preferably, the test holes are evenly distributed on the cylinder liner.

[0012] Preferably, it includes an A-plane test hole located at the top dead center crankshaft angle corresponding to the piston ring position, a B-plane test hole located 10° after the top dead center of the piston stroke, and a C-plane test hole located 20° after the top dead center.

[0013] Preferably, each plane is provided with three test holes distributed at intervals of 120°.

[0014] Preferably, the infrared temperature measurement module adopts a fiber-coupled infrared sensor, the core component of which is an InGaAs detector. Each sensor is equipped with an independent optical calibration system, including a focus-adjustable lens group with a focal length adjustment range of 10-50mm; the sampling frequency is 20kHz, and the temperature resolution is 0.5°C.

[0015] Preferably, the data acquisition unit adopts a multi-channel synchronous acquisition card with an FPGA architecture, with a time synchronization accuracy of less than 1μs; a built-in crankshaft angle trigger module, which achieves angle synchronization with an engine test system with a resolution of 0.1°; and can establish a mapping relationship between temperature data and the corresponding crankshaft angle to form a three-dimensional temperature field database.

[0016] Preferably, the data processing unit has a built-in temperature inversion algorithm based on Planck's radiation law, which can automatically correct the emissivity deviation.

[0017] Preferably, the test hole has a pore size of Φ10±0.01 mm and an inner surface roughness of Ra0.2 μm.

[0018] Preferably, the infrared temperature measurement module is connected to the data acquisition unit via an optical fiber, and is used to transmit the measured temperature signal to the data acquisition unit.

[0019] Preferably, the data processing unit is connected to a host computer and is used to transmit the processed temperature data to the host computer for visual display and further analysis.

[0020] In summary, the present invention has the following beneficial technical effects:

[0021] This invention uses a fiber-coupled infrared sensor instead of a traditional thermocouple, achieving non-contact measurement of piston ring temperature. This approach not only effectively avoids damage to the engine structure caused by traditional sensor installation, but also improves measurement accuracy and response speed. The infrared sensor has a high sampling frequency (20kHz) and high temperature resolution (0.5°C), accurately capturing minute temperature changes in the piston ring under different operating conditions, providing reliable data support for real-time engine monitoring.

[0022] The present invention realizes all-round and multi-angle temperature monitoring of the piston ring through a carefully designed multi-point test hole layout on the cylinder liner. The test holes are evenly distributed on the cylinder liner, covering three different axial planes (A, B, and C planes) and three different circumferential angles (evenly distributed at intervals of 120°), ensuring accurate measurement of the temperature of the piston ring at different crankshaft angles and in different directions. This layout design fully considers the operating characteristics of the engine and the movement laws of the piston ring, can fully cover the temperature monitoring needs of the piston ring, and effectively improves the comprehensiveness and accuracy of the monitoring. At the same time, the fine processing technology of the test holes (aperture size is Φ10±0.01mm, inner surface roughness is Ra0.2μm) further guarantees the measurement accuracy and stability of the infrared sensor.

[0023] The data acquisition and processing unit of the present invention provides strong technical support for the analysis and application of temperature data. The data acquisition unit adopts a multi-channel synchronous acquisition card with FPGA architecture, which has high time synchronization accuracy (<1μs) and angle synchronization capability (0.1° resolution), and can accurately match the temperature data with the crankshaft angle to construct a three-dimensional temperature field database of the piston ring. The data processing unit has a built-in temperature inversion algorithm based on Planck's radiation law, which can automatically correct the emissivity deviation to ensure the accuracy of the output data. Through the upper computer software, the user can intuitively view the temperature distribution of the piston ring, promptly detect potential overheating problems and take corresponding measures. This efficient data processing and analysis capability not only provides a strong guarantee for the safe operation of the engine, but also provides a detailed data basis for the design optimization and performance improvement of the engine, and has significant technical benefits and application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of a cylinder liner in a test system for monitoring the temperature of a marine engine piston ring according to the present invention;

[0025] Figure 2 For the present invention Figure 1 Schematic diagram of the middle AA section;

[0026] Figure 3 For the present invention Figure 1 Schematic diagram of the middle BB section;

[0027] Figure 4 For the present invention Figure 1 Schematic diagram of the middle CC section;

[0028] Figure 5 The figure is a schematic diagram of the principle of a test system for monitoring the temperature of a marine engine piston ring according to the present invention.

[0029] Figure numerals: 1, test hole one; 2, test hole two; 3, test hole three; 4, test hole four; 5, test hole five; 6, test hole six; 7, test hole seven; 8, test hole eight; 9, test hole nine; 10, piston ring; 11, data acquisition unit; 12, data processing unit; 13, cylinder liner; 14, infrared temperature measurement module. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] An embodiment of the present invention discloses a test system for monitoring the temperature of a marine engine piston ring. The system aims to achieve accurate temperature monitoring of a marine engine piston ring 10 under different operating conditions through an innovative temperature measurement scheme, thereby avoiding equipment damage caused by abnormal temperatures and improving the safety and reliability of engine operation.

[0032] This system abandons traditional thermocouple measurement methods in favor of advanced infrared temperature measurement technology. By carefully designing and machining multiple test holes in the engine cylinder liner (13), fiber-coupled infrared sensors are embedded within these holes, enabling non-contact measurement of the piston ring (10) temperature. This design not only improves measurement accuracy and response speed, but also effectively reduces the sensor's impact on the engine's internal structure and operating performance.

[0033] The core components of this invention include an infrared temperature measurement module 14, a data acquisition unit 11, a data processing unit 12, and a layout of test holes on the cylinder liner 13. The infrared temperature measurement module 14 is composed of multiple fiber-coupled infrared sensors. Each sensor's core component is an InGaAs detector and is equipped with an independent optical calibration system, enabling precise focal length adjustment to accommodate varying measurement distances. Its sampling frequency reaches 20kHz, and its temperature resolution reaches 0.5°C, ensuring real-time capture of temperature changes in the piston ring 10.

[0034] Data acquisition unit 11 utilizes a multi-channel synchronous acquisition card with an FPGA architecture, offering extremely high time synchronization accuracy (<1μs) and capable of achieving angular synchronization with the engine test system with a resolution of 0.1°. Using a built-in crankshaft angle trigger module, the acquisition unit maps temperature data to corresponding crankshaft angles, thereby constructing a three-dimensional temperature field database for the piston ring 10.

[0035] The data processing unit 12 incorporates a temperature inversion algorithm based on Planck's radiation law, automatically correcting for emissivity deviations and ensuring the accuracy of measurement data. Through the host computer, the infrared temperature measurement signal is combined with the crankshaft angle signal to enable real-time monitoring and analysis of the piston ring 10 temperature at different crankshaft angles and in different directions.

[0036] The layout design of the test holes fully considers the structural characteristics of the engine and the movement law of the piston ring 10. Nine different test positions are evenly selected on the cylinder liner 13, located in three different axial planes (A, B, and C planes) and three different circumferential angles (evenly distributed at intervals of 120°). Plane A is located at the position of the piston ring 10 corresponding to the crankshaft angle of the top dead center, plane B is located 10° after the top dead center of the piston stroke, and plane C is located 20° after the top dead center. The three test holes on each plane are marked A1-A3, B4-B6, and C7-C9 respectively. The aperture size for installing the infrared test instrument is Φ10±0.01mm, and the inner surface is finely polished to Ra0.2μm to ensure that the infrared sensor can obtain accurate temperature data.

[0037] As a key engine component, the piston ring 10's temperature monitoring is crucial for assessing engine operating status and preventing failures. This test system monitors piston ring 10 temperature changes in real time during engine operation, identifying potential overheating issues and enabling appropriate measures to prevent serious consequences such as damage to the cylinder liner 13 caused by excessive temperatures.

[0038] The infrared temperature measurement module 14 is installed in the test hole of the cylinder liner 13. Its fiber-coupled infrared sensor can effectively transmit infrared signals, ensuring the stability and reliability of the measurement data. Each infrared sensor is equipped with an adjustable focus lens group with a focal length adjustment range of 10-50mm. It can be precisely adjusted according to actual measurement requirements to adapt to the temperature measurement of the piston ring 10 at different positions and distances. Specifically, the core component is an InGaAs detector. Each sensor is equipped with an independent optical calibration system, including an adjustable focus lens group (focal length adjustment range of 10-50mm); the sampling frequency is 20kHz, and the temperature resolution is 0.5℃.

[0039] The data acquisition unit 11 integrates the temperature data acquired by multiple infrared temperature measurement modules 14 using high-speed synchronous acquisition technology and synchronizes it with the engine's crankshaft angle signal. This synchronization mechanism enables the system to accurately record the temperature changes of the piston ring 10 at different operating angles, providing a detailed data foundation for subsequent data analysis and fault diagnosis.

[0040] Data processing unit 12 uses Planck's radiation law to perform temperature inversion calculations on the collected infrared signals, automatically correcting for emissivity deviations to ensure accurate output temperature data. Through the host computer, users can intuitively view the temperature distribution of the piston ring 10 and assess and monitor the engine's operating status in real time.

[0041] also, Figure 1 Where 121.89, 202.2, and 282.2 are the distances between each section and the top point, in mm. An observation window can be provided on the cylinder wall and connected to the cylinder body.

[0042] This invention utilizes a unique test hole layout combined with infrared temperature measurement technology. Through multiple test holes strategically distributed throughout the cylinder liner 13, the system comprehensively covers piston ring 10 temperature measurements in various directions and at various operating angles. The use of fiber-coupled infrared sensors provides a stable and reliable temperature monitoring method for the high-temperature, high-pressure internal engine environment.

[0043] In practical applications, this invention can effectively improve the operational safety of marine engines and reduce equipment failures and maintenance costs caused by temperature anomalies. Furthermore, its accurate temperature monitoring data provides strong support for engine design optimization and performance improvement.

[0044] The test system for monitoring the temperature of a marine engine piston ring provided by an embodiment of the present invention realizes comprehensive, accurate, and real-time monitoring of the temperature of the piston ring 10 through innovative infrared temperature measurement technology and a carefully designed test hole layout, providing important technical support for the safe operation and performance optimization of marine engines.

[0045] The collaborative process of each component of the system is as follows:

[0046] The infrared temperature measurement module 14 uses its fiber-coupled infrared sensors to collect real-time temperature data at different positions of the piston ring 10. These sensors are installed in the test holes of the cylinder liner 13 and are precisely focused using an adjustable focus lens group to ensure that the acquired infrared signals are accurate.

[0047] The data acquisition unit 11 receives signals from various infrared sensors through a multi-channel synchronous acquisition card, and uses a built-in crankshaft angle trigger module to synchronize with the engine's operating angle to establish a mapping relationship between temperature data and the corresponding crankshaft angle.

[0048] The data processing unit 12 uses a temperature inversion algorithm based on Planck's radiation law to analyze and process the collected infrared signals, automatically correct the emissivity deviation, and finally generate accurate temperature data.

[0049] The host computer software visualizes this data, allowing operators to intuitively monitor piston ring 10 temperature changes and take timely action to address any temperature anomalies. The system's components work closely together to achieve efficient and accurate temperature monitoring of marine engine piston ring 10.

[0050] The application of this test system is not limited to marine engines; it can also be extended to other types of internal combustion engines and industrial fields requiring temperature monitoring of key components in high-temperature and high-pressure environments. Its innovative technical solutions and efficient data processing capabilities provide a new solution for equipment operational safety and performance optimization, with broad application prospects and significant technical value.

[0051] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A test system for monitoring the temperature of a marine engine piston ring, characterized in that: The invention comprises an infrared temperature measurement module (14) arranged in a test hole of a cylinder liner (13), a data acquisition unit (11) electrically connected to the infrared temperature measurement module (14), and a data processing unit (12) electrically connected to the data acquisition unit (11). The cylinder liner (13) test hole is provided with a plurality of test holes. The infrared temperature measurement module (14) is used to measure the temperature at different positions of a piston ring (10). The measured temperature data is collected and preliminarily processed by the data acquisition unit (11). The data processing unit (12) receives the data transmitted by the data acquisition unit (11) and performs in-depth analysis and processing to obtain the temperature distribution of the piston ring (10).

2. A test system for monitoring the temperature of a marine engine piston ring according to claim 1, characterized in that: The test holes are evenly distributed on the cylinder sleeve (13).

3. A test system for monitoring the temperature of a marine engine piston ring according to claim 2, characterized in that: It comprises an A-plane test hole located at the top dead center crankshaft angle corresponding to the position of the piston ring (10), a B-plane test hole located 10° after the top dead center of the piston stroke, and a C-plane test hole located 20° after the top dead center.

4. A test system for monitoring the temperature of a marine engine piston ring according to claim 3, characterized in that: Each plane is equipped with three test holes and distributed at intervals of 120°.

5. A test system for monitoring the temperature of a marine engine piston ring according to claim 4, characterized in that: The infrared temperature measurement module (14) adopts a fiber-coupled infrared sensor, the core component of which is an InGaAs detector. Each sensor is equipped with an independent optical calibration system, including an adjustable focus lens group, with a focal length adjustment range of 10-50 mm; the sampling frequency is 20 kHz, and the temperature resolution is 0.5°C.

6. A test system for monitoring the temperature of a marine engine piston ring according to claim 5, characterized in that: The data acquisition unit (11) adopts a multi-channel synchronous acquisition card with an FPGA architecture, with a time synchronization accuracy of less than 1 μs; a built-in crankshaft angle trigger module, which achieves angle synchronization with an engine test system with a resolution of 0.1°; and is capable of establishing a mapping relationship between temperature data and corresponding crankshaft angles to form a three-dimensional temperature field database.

7. A test system for monitoring the temperature of a marine engine piston ring according to claim 6, characterized in that: The data processing unit (12) has a built-in temperature inversion algorithm based on Planck's radiation law, which can automatically correct emissivity deviation.

8. A test system for monitoring the temperature of a marine engine piston ring according to any one of claims 1 to 7, characterized in that: The test hole has a pore size of Φ10±0.01 mm and an inner surface roughness of Ra0.2 μm.

9. A test system for monitoring the temperature of a marine engine piston ring according to any one of claims 1 to 7, characterized in that: The infrared temperature measurement module (14) is connected to the data acquisition unit (11) via an optical fiber and is used to transmit the measured temperature signal to the data acquisition unit (11).

10. A test system for monitoring the temperature of a marine engine piston ring according to claim 9, characterized in that: The data processing unit (12) is connected to a host computer and is used to transmit the processed temperature data to the host computer for visual display and further analysis.

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