Diesel engine cylinder status monitoring device

Abstract

The present invention discloses a diesel engine cylinder state monitoring device, comprising a composite piston ring, a cylinder wall temperature sensor, a piston ring wear monitoring sensor, a cylinder liner wear monitoring sensor, a data acquisition module, a data processing module and a PC display module. The composite piston ring comprises a cast iron piston ring substrate and a non-magnetic material inlaid ring. The cylinder wall temperature sensor is respectively fixed in the upper ends of both sides of the cylinder liner, and the piston ring wear monitoring sensor and the cylinder liner wear monitoring sensor are respectively fixed on the middle of both sides of the cylinder liner. The cylinder wall temperature sensor signal, the piston ring wear monitoring sensor signal and the cylinder liner wear monitoring sensor signal are respectively input into the data acquisition module, and the data acquisition module and the data processing module process the data and transmit it to the PC display module for displaying the data. The present invention prolongs the maintenance cycle of the diesel engine, reduces unnecessary disassembly and assembly and the replacement frequency of parts and components, thereby reducing the operating cost of the diesel engine.

Description

Technical Field

[0001] The invention relates to a measurement and control device for a diesel engine, in particular to a measurement and control device for automatically monitoring a two-stroke diesel engine, belonging to the technical field of diesel engine measurement and control. Background Art

[0002] The performance of a diesel engine during operation depends not only on the structural design and assembly process, but also on its maintenance. The existing diesel engine maintenance model is that the operator judges the service life of the diesel engine parts according to the instructions in the product maintenance manual and their own accumulated experience, and then performs maintenance or replaces the parts. This empirical maintenance model cannot make accurate judgments on the wear of vulnerable parts such as cylinder liners and piston rings under harsh working conditions such as high temperature and high pressure, thereby increasing the maintenance workload and causing unnecessary waste of manpower and material resources. Summary of the invention

[0003] The purpose of the present invention is to provide a diesel engine cylinder status monitoring device, which can perform condition-based maintenance management on the diesel engine by real-time monitoring of operating parameters and components of the diesel engine cylinder during normal operation, so as to provide data support for real-time monitoring of cylinder status and condition-based maintenance management.

[0004] The present invention is achieved through the following technical solutions:

[0005] A diesel engine cylinder state monitoring device comprises a composite piston ring and two cylinder wall temperature sensors, a piston ring wear monitoring sensor and a cylinder liner wear monitoring sensor, as well as a data acquisition module, a data processing module and a PC display module of a control unit. The composite piston ring is one of several piston rings, and comprises a cast iron piston ring substrate and a non-magnetic material inlaid ring fixed in the outer peripheral surface of the cast iron piston ring substrate. The cylinder wall temperature sensors are respectively fixed in the upper ends of both sides of the cylinder liner, and the piston ring wear monitoring sensor and the cylinder liner wear monitoring sensor are respectively fixed on the middle parts of both sides of the cylinder liner one above and one below. The cylinder wall temperature sensor signal, the piston ring wear monitoring sensor signal and the cylinder liner wear monitoring sensor signal are respectively input into the data acquisition module of the control unit through their corresponding signal lines. The data acquisition module and the data processing module process the data collected by each sensor through their internal programs and transmit them to the PC display module through the communication line, and the processed data are displayed on the PC display module.

[0006] The purpose of the present invention can be further achieved by the following technical measures.

[0007] Furthermore, the cross section of the non-magnetic material embedded ring is a triangle; the base ring surface of the triangle matches the outer peripheral surface of the cast iron piston ring base, and the ratio of the base ring surface width A to the cast iron piston ring base width B is: A / B=0.5-0.6. The material of the non-magnetic material embedded ring is brass.

[0008] Furthermore, the cylinder wall temperature sensor adopts Kongsberg MB684S115K60 temperature sensor with a temperature measurement range of 50°C to 250°C.

[0009] Furthermore, the piston ring wear monitoring sensor adopts Kongsberg IAS-10-A22-S-M12-PA / VAb-Z0E-0, with a maximum working cycle frequency of 1.2 kHz and a measuring distance of 4 mm.

[0010] Furthermore, the cylinder liner wear monitoring sensor adopts a thin film resistor wear sensor, the thin film resistor point area is selected to be 3mm, and the initial resistance value is 1000Ω.

[0011] The present invention changes one of several piston rings into a composite piston ring, and embeds a fixed non-magnetic material embedded ring in the outer peripheral surface of the cast iron piston ring substrate. The width of the non-magnetic material embedded ring will change accordingly as the degree of wear of the composite piston ring changes during operation. The wear degree of the piston ring can be determined by detecting the width change of the non-magnetic material embedded ring through the piston ring wear monitoring sensor. The cylinder wall temperature sensor and the cylinder liner wear monitoring sensor can respectively detect whether the real-time temperature of the cylinder liner and the wear amount of the cylinder liner exceed the standard. The present invention realizes uninterrupted monitoring of the operating parameters of the diesel engine during operation and the wear and working status of the cylinder components. By judging the operating status of the diesel engine and analyzing the wear trend of the cylinder components, the diesel engine is maintained and managed according to the situation, which prolongs the maintenance cycle of the diesel engine, reduces unnecessary disassembly and assembly and the frequency of replacement of parts, and thus reduces the operating cost of the diesel engine.

[0012] Advantages and features of the present invention will be illustrated and explained by the following non-limiting description of preferred embodiments thereof, which are given by way of example only with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the installation of the composite piston ring and the sensor of the present invention;

[0014] Figure 2 This is the working principle diagram of the piston ring wear monitoring sensor. DETAILED DESCRIPTION

[0015] The present invention will be further described below in conjunction with the accompanying drawings and two-stroke diesel engine embodiments.

[0016] like Figure 1 As shown, this embodiment includes a composite piston ring 10 and two cylinder wall temperature sensors 1, a piston ring wear monitoring sensor 2 and a cylinder liner wear monitoring sensor 3, as well as a data acquisition module 201, a data processing module 202 and a PC display module 203 of a control unit 20. The composite piston ring 10 of this embodiment is the first ring among the four piston rings, and includes a cast iron piston ring base 101 and a non-magnetic material embedded ring 102. The cross section of the non-magnetic material embedded ring 102 is a triangle, and the non-magnetic material embedded ring 102 is embedded and fixed in the middle of the outer peripheral surface of the cast iron piston ring base 101 through interference fit. The radial direction of the cast iron piston ring base 101 and the non-magnetic material embedded ring 102 are both left with margins. After the two are fixedly connected to each other as a whole, they are then finely turned to make the triangular bottom edge ring surface of the non-magnetic material embedded ring 102 coincide with the outer peripheral surface of the cast iron piston ring base 101. The ratio of the triangle base width A of the non-magnetic material embedded ring 102 of this embodiment to the cast iron piston ring base width B is: A / B=0.5. The non-magnetic material embedded ring 102 is made of brass.

[0017] The cylinder wall temperature sensors 1 are fixed to the upper ends of both sides of the cylinder liner 30. The measured values ​​of the two cylinder wall temperature sensors 1 are referenced to each other. At the same time, the two cylinder wall temperature sensors 1 are backup for each other. When one of them fails, the other one can still monitor. The cylinder wall temperature sensor 1 adopts Kongsberg MB684S115K60 temperature sensor with a temperature measurement range of 50℃~250℃.

[0018] The piston ring wear monitoring sensor 2 and the cylinder liner wear monitoring sensor 3 are fixed one above the other on the middle of both sides of the cylinder liner 30. The piston ring wear monitoring sensor 2 adopts Kongsberg IAS-10-A22-S-M12-PA / VAb-Z0E-0, with a maximum working cycle frequency of 1.2 kHz and a measuring distance of 4mm. The cylinder liner wear monitoring sensor 3 adopts a thin film resistor wear sensor, with a thin film resistor point area of ​​3mm and a starting resistance of 1000Ω.

[0019] The cylinder wall temperature sensor signal, the piston ring wear monitoring sensor signal and the cylinder liner wear monitoring sensor signal are respectively input into the data acquisition module 201 of the control unit 20 through their corresponding signal lines 204. The data acquisition module 201 and the data processing module 202 process the data collected by each sensor through their internal programs and transmit them to the PC display module 203 through the communication line. The processed data is displayed on the PC display module 203.

[0020] like Figure 2As shown, the working principle of the piston ring wear monitoring sensor 2 is as follows: the piston ring wear monitoring sensor 2 uses the principle of electromagnetic induction to monitor the state of the composite piston ring 10. When the diesel engine is running, the piston 10A reciprocates up and down, and the piston ring also passes through the surface of the piston ring wear monitoring sensor 2. The pulse signal waveform of the piston ring wear monitoring sensor 2 is as follows: Figure 2 As shown in the lower right corner of . When the composite piston ring 10 passes through the piston ring wear monitoring sensor 2, its lower edge generates a positive pulse signal a1, the lower edge of the non-magnetic material embedded ring 102 generates a negative pulse signal i1, and the upper edge of the non-magnetic material embedded ring 102 generates a positive pulse signal i2. When the upper edge of the composite piston ring 10 passes through the piston ring wear monitoring sensor 2, a negative pulse signal a2 is generated. The width A of the composite piston ring 10 is a known constant, and the geometric length of the time interval a is also a known constant. Then, according to the time proportional relationship between a and i, their geometric proportional relationship can be determined. Let the width of the non-magnetic material embedded ring 102 be B, then A / B=a / i, so the wear of the piston ring can be determined according to the width B of the non-magnetic material embedded ring 102.

[0021] In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solutions formed by equivalent replacement or equivalent transformation shall fall within the protection scope required by the present invention.

Claims

1. A diesel engine cylinder status monitoring device, characterized in that: It includes a composite piston ring and two cylinder wall temperature sensors, as well as a piston ring wear monitoring sensor and a cylinder liner wear monitoring sensor, and a data acquisition module, a data processing module and a PC display module of a control unit. The composite piston ring is one of several piston rings, and includes a cast iron piston ring substrate and a non-magnetic material inlaid ring fixed in the outer peripheral surface of the cast iron piston ring substrate. The cylinder wall temperature sensors are respectively fixed in the upper ends of both sides of the cylinder liner, and the piston ring wear monitoring sensor and the cylinder liner wear monitoring sensor are respectively fixed on the middle parts of both sides of the cylinder liner one above and one below; the cylinder wall temperature sensor signal, the piston ring wear monitoring sensor signal and the cylinder liner wear monitoring sensor signal are respectively input into the data acquisition module of the control unit through their corresponding signal lines, and the data acquisition module and the data processing module process the data collected by each sensor through their internal programs and transmit them to the PC display module through the communication line, and the processed data are displayed on the PC display module; The cross section of the non-magnetic material embedded ring is a triangle; the base ring surface of the triangle is consistent with the outer peripheral surface of the cast iron piston ring base, and the ratio of the base ring surface width A to the cast iron piston ring base width B is: A / B=0.5-0.6; The non-magnetic conductive material inlay ring is made of brass.

2. The diesel engine cylinder state monitoring device according to claim 1, characterized in that: The cylinder wall temperature sensor adopts Kongsberg MB684S115K60 temperature sensor, and the temperature measurement range is: 50℃~250℃.

3. The diesel engine cylinder state monitoring device according to claim 1, characterized in that: The piston ring wear monitoring sensor adopts Kongsberg IAS-10-A22-S-M12-PA / VAb-Z0E-0, with a maximum working cycle frequency of 1.2 kHz and a measuring distance of 4 mm.

4. The diesel engine cylinder state monitoring device according to claim 1, characterized in that: The cylinder liner wear monitoring sensor adopts a thin film resistor wear sensor, the thin film resistor point area is selected to be 3mm, and the initial resistance value is 1000Ω.

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